Dépouillements

Double-stator switched reluctance machines (DSSRM) / Abbasian, M. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 589 - 597 Titre : Double-stator switched reluctance machines (DSSRM) : fundamentals and magnetic force analysis Type de document : texte imprimé Auteurs : Abbasian, M., Auteur ; M. Moallem, Auteur ; Fahimi, B., Auteur Année de publication : 2011 Article en page(s) : pp. 589 - 597 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : finite  element  analysis;  inductance;  reluctance  machines;  stators Résumé : In this paper, a new switched reluctance machine with a double-stator configuration (DSSRM) is introduced. The proposed design is based on optimization of the motional forces, which leads to a high-grade electromechanical energy conversion process. A local examination of the force densities within and throughout a conventional switched reluctance machine (SRM) shows that the majority of the force produced is in the radial direction and does not contribute to motion. If the normal forces happen to be in the direction of motion, a larger motional force profile for SRM is yield. Based on these guidelines, a new SRM (DSSRM) is proposed. To compare energy conversion efficiency of DSSRM with that of the conventional SRM, a finite element model is constructed. An experimental prototype of the proposed machine is developed, and the phase inductance is measured. The results of our investigations indicate that the proposed geometry offers superior performance in terms of higher power density and higher percentage of the motional forces. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5546930&sortType%3Das [...] [article] Double-stator switched reluctance machines (DSSRM) : fundamentals and magnetic force analysis [texte imprimé] / Abbasian, M., Auteur ; M. Moallem, Auteur ; Fahimi, B., Auteur . - 2011 . - pp. 589 - 597. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 589 - 597 Mots-clés : finite  element  analysis;  inductance;  reluctance  machines;  stators Résumé : In this paper, a new switched reluctance machine with a double-stator configuration (DSSRM) is introduced. The proposed design is based on optimization of the motional forces, which leads to a high-grade electromechanical energy conversion process. A local examination of the force densities within and throughout a conventional switched reluctance machine (SRM) shows that the majority of the force produced is in the radial direction and does not contribute to motion. If the normal forces happen to be in the direction of motion, a larger motional force profile for SRM is yield. Based on these guidelines, a new SRM (DSSRM) is proposed. To compare energy conversion efficiency of DSSRM with that of the conventional SRM, a finite element model is constructed. An experimental prototype of the proposed machine is developed, and the phase inductance is measured. The results of our investigations indicate that the proposed geometry offers superior performance in terms of higher power density and higher percentage of the motional forces. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5546930&sortType%3Das [...]

Design optimization of transverse flux linear motor for weight reduction and performance improvement using response surface methodology and genetic algorithms / Hasanien, H.M. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 598 - 605 Titre : Design optimization of transverse flux linear motor for weight reduction and performance improvement using response surface methodology and genetic algorithms Type de document : texte imprimé Auteurs : Hasanien, H.M., Auteur ; Abd-Rabou, A.S., Auteur ; Sakr, S.M., Auteur Année de publication : 2011 Article en page(s) : pp. 598 - 605 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : finite  element  analysis;  genetic  algorithms;  linear  motors;  permanent  magnet  motors Résumé : Permanent magnet (PM) type transverse flux linear motors (TFLMs) are electromagnetic devices, which can develop directly powerful linear motion. These motors have been developed to apply to high power system, such as railway traction, electrodynamics vibrator, free-piston generator, etc. This paper presents an optimum design of a PM-type TFLM to reduce the weight of motor with constraints of thrust and detent force using response surface methodology (RSM) and genetic algorithms (GAs). RSM is well adapted to make analytical model of motor weight with constraints of thrust and detent forces, and enable objective function to be easily created and a great computational time to be saved. Finite element computations have been used for numerical experiments on geometrical design variables in order to determine the coefficients of a second-order analytical model for the RSM. GAs are used as a searching tool for design optimization of TFLM to reduce the weight of motor and improve the motor performance. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5504077&sortType%3Das [...] [article] Design optimization of transverse flux linear motor for weight reduction and performance improvement using response surface methodology and genetic algorithms [texte imprimé] / Hasanien, H.M., Auteur ; Abd-Rabou, A.S., Auteur ; Sakr, S.M., Auteur . - 2011 . - pp. 598 - 605. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 598 - 605 Mots-clés : finite  element  analysis;  genetic  algorithms;  linear  motors;  permanent  magnet  motors Résumé : Permanent magnet (PM) type transverse flux linear motors (TFLMs) are electromagnetic devices, which can develop directly powerful linear motion. These motors have been developed to apply to high power system, such as railway traction, electrodynamics vibrator, free-piston generator, etc. This paper presents an optimum design of a PM-type TFLM to reduce the weight of motor with constraints of thrust and detent force using response surface methodology (RSM) and genetic algorithms (GAs). RSM is well adapted to make analytical model of motor weight with constraints of thrust and detent forces, and enable objective function to be easily created and a great computational time to be saved. Finite element computations have been used for numerical experiments on geometrical design variables in order to determine the coefficients of a second-order analytical model for the RSM. GAs are used as a searching tool for design optimization of TFLM to reduce the weight of motor and improve the motor performance. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5504077&sortType%3Das [...]

A time-harmonic three-dimensional vector boundary element model for electromechanical devices / O'Connell, T.C. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 606 - 618 Titre : A time-harmonic three-dimensional vector boundary element model for electromechanical devices Type de document : texte imprimé Auteurs : O'Connell, T.C., Auteur ; Krein, P.T., Auteur Année de publication : 2011 Article en page(s) : pp. 606 - 618 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : boundary-elements  methods;  boundary-value  problems;  electric  machines;  finite  element  analysis;  machine  theory;  matrix  algebra Résumé : In present practice, the most effective way to solve the large electromagnetic (EM) boundary value problems typical in electromechanical device analysis has been with the finite element method (FEM). The sparse, symmetric, and banded structure of FEM system matrices reduces the memory requirements and facilitates several fast and efficient solution algorithms. An alternative, boundary element methods (BEM), is more computationally intensive. Recently, however, fast and efficient solver codes have been developed for BEM solutions of EM scattering problems. These, if effectively implemented in electromechanical device models, can make BEM a more feasible alternative for this purpose than previously. To generate a deeper understanding of this alternative formulation in the context of electromechanics problems, a time-harmonic 3-D vector BEM model for electromechanical devices is presented that is formulated in terms of the field variables and is capable of modeling multiple separated homogeneous regions with or without eddy currents. Extensions to electric machine modeling are given, and the model is assessed using experimental data. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5437340&sortType%3Das [...] [article] A time-harmonic three-dimensional vector boundary element model for electromechanical devices [texte imprimé] / O'Connell, T.C., Auteur ; Krein, P.T., Auteur . - 2011 . - pp. 606 - 618. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 606 - 618 Mots-clés : boundary-elements  methods;  boundary-value  problems;  electric  machines;  finite  element  analysis;  machine  theory;  matrix  algebra Résumé : In present practice, the most effective way to solve the large electromagnetic (EM) boundary value problems typical in electromechanical device analysis has been with the finite element method (FEM). The sparse, symmetric, and banded structure of FEM system matrices reduces the memory requirements and facilitates several fast and efficient solution algorithms. An alternative, boundary element methods (BEM), is more computationally intensive. Recently, however, fast and efficient solver codes have been developed for BEM solutions of EM scattering problems. These, if effectively implemented in electromechanical device models, can make BEM a more feasible alternative for this purpose than previously. To generate a deeper understanding of this alternative formulation in the context of electromechanics problems, a time-harmonic 3-D vector BEM model for electromechanical devices is presented that is formulated in terms of the field variables and is capable of modeling multiple separated homogeneous regions with or without eddy currents. Extensions to electric machine modeling are given, and the model is assessed using experimental data. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5437340&sortType%3Das [...]

New unbalance factor for estimating performance of a three-phase induction motor with under- and overvoltage unbalance / Anwari, M. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 619 - 625 Titre : New unbalance factor for estimating performance of a three-phase induction motor with under- and overvoltage unbalance Type de document : texte imprimé Auteurs : Anwari, M., Auteur ; Hiendro, A., Auteur Année de publication : 2011 Article en page(s) : pp. 619 - 625 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : induction  motors;  overvoltage Résumé : This paper evaluates the influence of the unbalance factors in calculating total copper losses, efficiency, power factor, input power, output torque, peak currents, and derating factor of the motor operating under unbalanced voltage system. The complete definition for the voltage unbalance is using complex voltage-unbalance factor that consists of its magnitude and angle. A coefficient to determine either under- or over-unbalance conditions is inserted. The analysis of the motor is performed using the method of symmetrical component, and MATLAB software is used to investigate the performance of the induction motor. The simulation results show that the International Electrotechnical Commission definition of the voltage unbalance combined with the coefficient of unbalance condition can be applied to evaluate total copper losses, input power, power factor, and total output torque precisely. However, the phase angle of the unbalance factor must be included for accurate prediction of peak current and peak copper losses of the phase windings and derating factor of the motor. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5492182&sortType%3Das [...] [article] New unbalance factor for estimating performance of a three-phase induction motor with under- and overvoltage unbalance [texte imprimé] / Anwari, M., Auteur ; Hiendro, A., Auteur . - 2011 . - pp. 619 - 625. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 619 - 625 Mots-clés : induction  motors;  overvoltage Résumé : This paper evaluates the influence of the unbalance factors in calculating total copper losses, efficiency, power factor, input power, output torque, peak currents, and derating factor of the motor operating under unbalanced voltage system. The complete definition for the voltage unbalance is using complex voltage-unbalance factor that consists of its magnitude and angle. A coefficient to determine either under- or over-unbalance conditions is inserted. The analysis of the motor is performed using the method of symmetrical component, and MATLAB software is used to investigate the performance of the induction motor. The simulation results show that the International Electrotechnical Commission definition of the voltage unbalance combined with the coefficient of unbalance condition can be applied to evaluate total copper losses, input power, power factor, and total output torque precisely. However, the phase angle of the unbalance factor must be included for accurate prediction of peak current and peak copper losses of the phase windings and derating factor of the motor. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5492182&sortType%3Das [...]

Complete Parallelogram Hysteresis Model for Electric Machines / Liang Cao in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 626 - 632 Titre : Complete Parallelogram Hysteresis Model for Electric Machines Type de document : texte imprimé Auteurs : Liang Cao, Auteur ; Ge Li, Auteur Année de publication : 2011 Article en page(s) : pp. 626 - 632 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Fourier  transforms;  hysteresis  motors Résumé : An equivalent circuit for a hysteresis motor (HM) is established in this paper, of which the electrical parameters can be directly calculated for motor analysis. The circuit is based on the parallelogram hysteresis model (PHM), which is often used in the analysis of electric machines, including the HMs and the permanent magnet motors. In this paper, a significant variable (Br) of the PHM developed by Copeland and Slemon (CSPM) is first modified, which makes the major loop area of the B -H parallelogram and that of the B-H rectangular loop theoretically equal. Then, the equivalent circuit of an HM is set up. To obtain the parameters in the equivalent circuit, the corresponding ellipse model of the modified CSPM is derived by Fourier transform. Finally, a 30-HP written pole machine is analyzed and its rated operation point is obtained from the equivalent circuit. The test data validate the equivalent circuit and the calculations. The method presented in this paper is proved to be useful in the design of HMs as well as written pole machines. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552143&sortType%3Das [...] [article] Complete Parallelogram Hysteresis Model for Electric Machines [texte imprimé] / Liang Cao, Auteur ; Ge Li, Auteur . - 2011 . - pp. 626 - 632. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 626 - 632 Mots-clés : Fourier  transforms;  hysteresis  motors Résumé : An equivalent circuit for a hysteresis motor (HM) is established in this paper, of which the electrical parameters can be directly calculated for motor analysis. The circuit is based on the parallelogram hysteresis model (PHM), which is often used in the analysis of electric machines, including the HMs and the permanent magnet motors. In this paper, a significant variable (Br) of the PHM developed by Copeland and Slemon (CSPM) is first modified, which makes the major loop area of the B -H parallelogram and that of the B-H rectangular loop theoretically equal. Then, the equivalent circuit of an HM is set up. To obtain the parameters in the equivalent circuit, the corresponding ellipse model of the modified CSPM is derived by Fourier transform. Finally, a 30-HP written pole machine is analyzed and its rated operation point is obtained from the equivalent circuit. The test data validate the equivalent circuit and the calculations. The method presented in this paper is proved to be useful in the design of HMs as well as written pole machines. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552143&sortType%3Das [...]

Iron loss model for rotating machines using direct eddy current analysis in electrical steel sheets / Yamazaki, K. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 633 - 641 Titre : Iron loss model for rotating machines using direct eddy current analysis in electrical steel sheets Type de document : texte imprimé Auteurs : Yamazaki, K., Auteur ; Fukushima, N., Auteur Année de publication : 2011 Article en page(s) : pp. 633 - 641 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : approximation  theory;  eddy  current  losses;  electromagnetic  fields;  finite  element  analysis;  magnetic  flux;  permanent  magnet  machines;  steel Résumé : In this paper, we propose and validate a method for the accurate estimation of iron loss in rotating machines. In this method, the eddy current loss in electrical steel sheets is directly calculated by nonlinear time-domain electromagnetic field analysis with a simple approximation of the excess loss. The hysteresis loss is also estimated by considering the flux distribution along the thickness of the steel sheet. The advantage of the method is that the high-frequency harmonic losses can be calculated accurately using only few material constants. The validity of this method is confirmed by experiments performed on a ring specimen and several types of motors. The experimental and calculated iron losses in each experiment are found to be in good agreement. It is clarified that the proposed method is useful for the accurate estimation of higher order harmonic losses, particularly, carrier losses caused by inverters. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5422658&sortType%3Das [...] [article] Iron loss model for rotating machines using direct eddy current analysis in electrical steel sheets [texte imprimé] / Yamazaki, K., Auteur ; Fukushima, N., Auteur . - 2011 . - pp. 633 - 641. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 633 - 641 Mots-clés : approximation  theory;  eddy  current  losses;  electromagnetic  fields;  finite  element  analysis;  magnetic  flux;  permanent  magnet  machines;  steel Résumé : In this paper, we propose and validate a method for the accurate estimation of iron loss in rotating machines. In this method, the eddy current loss in electrical steel sheets is directly calculated by nonlinear time-domain electromagnetic field analysis with a simple approximation of the excess loss. The hysteresis loss is also estimated by considering the flux distribution along the thickness of the steel sheet. The advantage of the method is that the high-frequency harmonic losses can be calculated accurately using only few material constants. The validity of this method is confirmed by experiments performed on a ring specimen and several types of motors. The experimental and calculated iron losses in each experiment are found to be in good agreement. It is clarified that the proposed method is useful for the accurate estimation of higher order harmonic losses, particularly, carrier losses caused by inverters. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5422658&sortType%3Das [...]

Minimum copper loss and power distribution control strategies of double-inverter-fed wound-rotor induction machines using energetic macroscopic representation / Keyu Chen in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 642 - 651 Titre : Minimum copper loss and power distribution control strategies of double-inverter-fed wound-rotor induction machines using energetic macroscopic representation Type de document : texte imprimé Auteurs : Keyu Chen, Auteur ; Delarue, Phillipe, Auteur ; Bouscayrol, Alain, Auteur Année de publication : 2011 Article en page(s) : pp. 642 - 651 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : asynchronous  machines;  energy  management  systems;  losses;  machine  control;  power  control;  rotors;  stators Résumé : A double-inverter-fed wound-rotor induction machine (DIF-WRIM) requires two inverters whereas standard configuration using induction machines requires one. This supplementary inverter leads to more possibilities with respect to energy management. Indeed, it allows new DOFs to be used. Energetic macroscopic representation (EMR) is used to represent the system in a graphical way. The model of the system is thus organized to highlight the DOFs of the system. An inversion-based control is then graphically deduced from the EMR of the system. Two strategies regarding the energy management are then used to exploit all DOFs. First, the distribution of the active power between the stator and rotor is achieved as in other works. A new minimum loss strategy is then added to increase the efficiency of the system. Experimental results validate the suggested control with both strategies, and good dynamic performances are achieved. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552151&sortType%3Das [...] [article] Minimum copper loss and power distribution control strategies of double-inverter-fed wound-rotor induction machines using energetic macroscopic representation [texte imprimé] / Keyu Chen, Auteur ; Delarue, Phillipe, Auteur ; Bouscayrol, Alain, Auteur . - 2011 . - pp. 642 - 651. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 642 - 651 Mots-clés : asynchronous  machines;  energy  management  systems;  losses;  machine  control;  power  control;  rotors;  stators Résumé : A double-inverter-fed wound-rotor induction machine (DIF-WRIM) requires two inverters whereas standard configuration using induction machines requires one. This supplementary inverter leads to more possibilities with respect to energy management. Indeed, it allows new DOFs to be used. Energetic macroscopic representation (EMR) is used to represent the system in a graphical way. The model of the system is thus organized to highlight the DOFs of the system. An inversion-based control is then graphically deduced from the EMR of the system. Two strategies regarding the energy management are then used to exploit all DOFs. First, the distribution of the active power between the stator and rotor is achieved as in other works. A new minimum loss strategy is then added to increase the efficiency of the system. Experimental results validate the suggested control with both strategies, and good dynamic performances are achieved. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552151&sortType%3Das [...]

ANN-based optimal energy control of induction motor drive in pumping applications / O. S. Ebrahim in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 652 - 660 Titre : ANN-based optimal energy control of induction motor drive in pumping applications Type de document : texte imprimé Auteurs : O. S. Ebrahim, Auteur ; Badr, M.A., Auteur ; Elgendy, A.S., Auteur Année de publication : 2011 Article en page(s) : pp. 652 - 660 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : induction  motor  drives;  machine  control;  neurocontrollers;  optimal  control;  power  control;  velocity  control;  voltage  control Résumé : This paper investigates the opportunity for energy saving in a three-phase induction motor (IM) driving pump load and proposes an improved loss model control (LMC). Compared with other power-loss reduction algorithms for IM, the presented one has the advantages of fast and smooth flux adaptation, high accuracy, and versatile implementation. The performance of LMC depends mainly on the accuracy of modeling the motor drive and losses. In this paper, the derived loss model considers the surplus power loss caused by inverter voltage harmonics using closed-form equations and also includes the magnetic saturation. An artificial neural network controller is synthesized and trained offline to determine the optimal flux level that achieves maximum drive efficiency. The drive's voltage and speed control loops are connected via the actual stator frequency, making the scheme comparatively reliable. Simulation and experimental studies are performed on 5.5-kW test motor using the proposed control method. The test results are provided and compared with the fixed flux operation to validate the effectiveness. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5431070&sortType%3Das [...] [article] ANN-based optimal energy control of induction motor drive in pumping applications [texte imprimé] / O. S. Ebrahim, Auteur ; Badr, M.A., Auteur ; Elgendy, A.S., Auteur . - 2011 . - pp. 652 - 660. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 652 - 660 Mots-clés : induction  motor  drives;  machine  control;  neurocontrollers;  optimal  control;  power  control;  velocity  control;  voltage  control Résumé : This paper investigates the opportunity for energy saving in a three-phase induction motor (IM) driving pump load and proposes an improved loss model control (LMC). Compared with other power-loss reduction algorithms for IM, the presented one has the advantages of fast and smooth flux adaptation, high accuracy, and versatile implementation. The performance of LMC depends mainly on the accuracy of modeling the motor drive and losses. In this paper, the derived loss model considers the surplus power loss caused by inverter voltage harmonics using closed-form equations and also includes the magnetic saturation. An artificial neural network controller is synthesized and trained offline to determine the optimal flux level that achieves maximum drive efficiency. The drive's voltage and speed control loops are connected via the actual stator frequency, making the scheme comparatively reliable. Simulation and experimental studies are performed on 5.5-kW test motor using the proposed control method. The test results are provided and compared with the fixed flux operation to validate the effectiveness. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5431070&sortType%3Das [...]

Sensorless brushless DC motor drive based on the zero-crossing detection of back electromotive force (EMF) from the line voltage difference / Damodharan, P. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 661 - 668 Titre : Sensorless brushless DC motor drive based on the zero-crossing detection of back electromotive force (EMF) from the line voltage difference Type de document : texte imprimé Auteurs : Damodharan, P., Auteur ; Vasudevan, K., Auteur Année de publication : 2011 Article en page(s) : pp. 661 - 668 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : DC  motor  drives;  brushless  DC  motors;  electric  potential Résumé : This paper describes a position sensorless operation of permanent magnet brushless direct current (BLDC) motor. The position sensorless BLDC drive proposed, in this paper, is based on detection of back electromotive force (back EMF) zero crossing from the terminal voltages. The proposed method relies on a difference of line voltages measured at the terminals of the motor. It is shown, in the paper, that this difference of line voltages provides an amplified version of an appropriate back EMF at its zero crossings. The commutation signals are obtained without the motor neutral voltage. The effectiveness of the proposed method is demonstrated through simulation and experimental results. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5437241&sortType%3Das [...] [article] Sensorless brushless DC motor drive based on the zero-crossing detection of back electromotive force (EMF) from the line voltage difference [texte imprimé] / Damodharan, P., Auteur ; Vasudevan, K., Auteur . - 2011 . - pp. 661 - 668. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 661 - 668 Mots-clés : DC  motor  drives;  brushless  DC  motors;  electric  potential Résumé : This paper describes a position sensorless operation of permanent magnet brushless direct current (BLDC) motor. The position sensorless BLDC drive proposed, in this paper, is based on detection of back electromotive force (back EMF) zero crossing from the terminal voltages. The proposed method relies on a difference of line voltages measured at the terminals of the motor. It is shown, in the paper, that this difference of line voltages provides an amplified version of an appropriate back EMF at its zero crossings. The commutation signals are obtained without the motor neutral voltage. The effectiveness of the proposed method is demonstrated through simulation and experimental results. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5437241&sortType%3Das [...]

Performance of an axial-flux permanent magnet synchronous generator from 3-D finite-element analysis / Chan, T. F. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 669 - 676 Titre : Performance of an axial-flux permanent magnet synchronous generator from 3-D finite-element analysis Type de document : texte imprimé Auteurs : Chan, T. F., Auteur ; Weimin Wang, Auteur ; Lai, L.L., Auteur Année de publication : 2011 Article en page(s) : pp. 669 - 676 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : finite  element  analysis;  machine  theory;  permanent  magnet  generators;  rotors;  stators;  synchronous  generators Résumé : For the first time, this paper presents field computation results and performance of an axial-flux permanent magnet synchronous generator (AFPMSG) based on a time-stepping, 3-D finite-element analysis (3-D FEA). The prototype generator studied has a ferromagnetic outer rotor frame and a totally enclosed design, while a coreless stator armature configuration is used. Based on the machine geometry, a 3-D FEA model is developed in order to determine the principal field components. The flux in the rotor back plate and the transverse flux through the ferromagnetic spacer, which is part of the rotor frame, can both be predicted. A time-stepping, coupled field-circuit approach enables the waveforms and load characteristics of the AFPMSG to be obtained accurately. The computed results are validated by experiments on the prototype generator. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5437336&sortType%3Das [...] [article] Performance of an axial-flux permanent magnet synchronous generator from 3-D finite-element analysis [texte imprimé] / Chan, T. F., Auteur ; Weimin Wang, Auteur ; Lai, L.L., Auteur . - 2011 . - pp. 669 - 676. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 669 - 676 Mots-clés : finite  element  analysis;  machine  theory;  permanent  magnet  generators;  rotors;  stators;  synchronous  generators Résumé : For the first time, this paper presents field computation results and performance of an axial-flux permanent magnet synchronous generator (AFPMSG) based on a time-stepping, 3-D finite-element analysis (3-D FEA). The prototype generator studied has a ferromagnetic outer rotor frame and a totally enclosed design, while a coreless stator armature configuration is used. Based on the machine geometry, a 3-D FEA model is developed in order to determine the principal field components. The flux in the rotor back plate and the transverse flux through the ferromagnetic spacer, which is part of the rotor frame, can both be predicted. A time-stepping, coupled field-circuit approach enables the waveforms and load characteristics of the AFPMSG to be obtained accurately. The computed results are validated by experiments on the prototype generator. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5437336&sortType%3Das [...]

Two-reaction theory of homopolar inductor alternator / Zhenxiu Lou in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 677 - 679 Titre : Two-reaction theory of homopolar inductor alternator Type de document : texte imprimé Auteurs : Zhenxiu Lou, Auteur ; Kexun Yu, Auteur ; Liheng Wang, Auteur Année de publication : 2011 Article en page(s) : pp. 677 - 679 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : alternators;  finite  element  analysis;  machine  theory Résumé : This letter aims to settle the controversy about whether or not the two-reaction theory is applicable to homopolar inductor alternator (HIA). First, the prerequisite of two-reaction theory is introduced. The direct and quadrature axes of HIA are defined and the corresponding armature reaction fields are calculated respectively based on finite element method. A conclusion that two-reaction theory is applicable to HIA is made using spatial overlay analysis. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5415652&sortType%3Das [...] [article] Two-reaction theory of homopolar inductor alternator [texte imprimé] / Zhenxiu Lou, Auteur ; Kexun Yu, Auteur ; Liheng Wang, Auteur . - 2011 . - pp. 677 - 679. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 677 - 679 Mots-clés : alternators;  finite  element  analysis;  machine  theory Résumé : This letter aims to settle the controversy about whether or not the two-reaction theory is applicable to homopolar inductor alternator (HIA). First, the prerequisite of two-reaction theory is introduced. The direct and quadrature axes of HIA are defined and the corresponding armature reaction fields are calculated respectively based on finite element method. A conclusion that two-reaction theory is applicable to HIA is made using spatial overlay analysis. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5415652&sortType%3Das [...]

Advanced modeling of a synchronous generator under line-switching and load-rejection tests for isolated grid applications / Wamkeue, R. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 680 - 689 Titre : Advanced modeling of a synchronous generator under line-switching and load-rejection tests for isolated grid applications Type de document : texte imprimé Auteurs : Wamkeue, R., Auteur ; Jolette, C., Auteur ; Kamwa, I., Auteur Année de publication : 2011 Article en page(s) : pp. 680 - 689 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : synchronous  generators Résumé : This paper deals with an efficient method behind the analysis of a saturated synchronous generator (SG) under line-switching and load-rejection tests for islanded networks. This novel approach is based on a SG and ( P,V,Q) load-equivalent combined state-space model. Full and partial load-rejection tests and line-switching tests are explored. The k -factor cross-saturation theory of SG is applied to account for the saturation phenomenon in the proposed model. The paper also attempts to point out the duality between line-switching and load-rejection tests. As the best alternative to the load-rejection test, the line-switching test is simple and more suitable, providing easy steady-state conditions (zero armature currents and rotor angle). Consequently, there is no need for rotor angle positioning when performing the test. Comparisons between simulation results and actual data obtained from a four-pole 1.5-kVA, 208-V, 60-Hz laboratory machine show the effectiveness of the proposed SG stator decrement tests analysis framework. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552153&sortType%3Das [...] [article] Advanced modeling of a synchronous generator under line-switching and load-rejection tests for isolated grid applications [texte imprimé] / Wamkeue, R., Auteur ; Jolette, C., Auteur ; Kamwa, I., Auteur . - 2011 . - pp. 680 - 689. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 680 - 689 Mots-clés : synchronous  generators Résumé : This paper deals with an efficient method behind the analysis of a saturated synchronous generator (SG) under line-switching and load-rejection tests for islanded networks. This novel approach is based on a SG and ( P,V,Q) load-equivalent combined state-space model. Full and partial load-rejection tests and line-switching tests are explored. The k -factor cross-saturation theory of SG is applied to account for the saturation phenomenon in the proposed model. The paper also attempts to point out the duality between line-switching and load-rejection tests. As the best alternative to the load-rejection test, the line-switching test is simple and more suitable, providing easy steady-state conditions (zero armature currents and rotor angle). Consequently, there is no need for rotor angle positioning when performing the test. Comparisons between simulation results and actual data obtained from a four-pole 1.5-kVA, 208-V, 60-Hz laboratory machine show the effectiveness of the proposed SG stator decrement tests analysis framework. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552153&sortType%3Das [...]

Finite-element inductance computation in 2-D eddy-current systems using sensitivity analysis / Melgoza, E. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 690 - 697 Titre : Finite-element inductance computation in 2-D eddy-current systems using sensitivity analysis Type de document : texte imprimé Auteurs : Melgoza, E., Auteur ; Escarela-Perez, R., Auteur ; José Alvarez-Ramírez, Auteur Année de publication : 2011 Article en page(s) : pp. 690 - 697 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Jacobian  matrices;  asynchronous  machines;  eddy  currents;  finite  element  analysis;  machine  theory;  sensitivity  analysis Résumé : A new finite-element (FE) method for the determination of differential and apparent inductances of massive conductors is proposed using a sensitivity analysis approach. The new technique is a one-step computation procedure in which the definition of distribution vectors makes possible a unified treatment of solid and filamentary conductors. Since massive conductors are included in the formulation, eddy-current and proximity effects are properly considered. The inductance matrix expression, formally derived from the sensitivity analysis, requires only one evaluation of the Jacobian matrix of the FE system at the solution point. As a result, an efficient calculation can be performed using the same solver employed in the FE solution. The computation of a multiport equivalent of an induction machine has been used to show the power of the proposed method. Our FE and multiport network results have been validated using a well-known commercial FE package. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552141&sortType%3Das [...] [article] Finite-element inductance computation in 2-D eddy-current systems using sensitivity analysis [texte imprimé] / Melgoza, E., Auteur ; Escarela-Perez, R., Auteur ; José Alvarez-Ramírez, Auteur . - 2011 . - pp. 690 - 697. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 690 - 697 Mots-clés : Jacobian  matrices;  asynchronous  machines;  eddy  currents;  finite  element  analysis;  machine  theory;  sensitivity  analysis Résumé : A new finite-element (FE) method for the determination of differential and apparent inductances of massive conductors is proposed using a sensitivity analysis approach. The new technique is a one-step computation procedure in which the definition of distribution vectors makes possible a unified treatment of solid and filamentary conductors. Since massive conductors are included in the formulation, eddy-current and proximity effects are properly considered. The inductance matrix expression, formally derived from the sensitivity analysis, requires only one evaluation of the Jacobian matrix of the FE system at the solution point. As a result, an efficient calculation can be performed using the same solver employed in the FE solution. The computation of a multiport equivalent of an induction machine has been used to show the power of the proposed method. Our FE and multiport network results have been validated using a well-known commercial FE package. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552141&sortType%3Das [...]

Methods of resistance estimation in permanent magnet synchronous motors for real-time thermal management / Wilson, S.D. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 698 - 707 Titre : Methods of resistance estimation in permanent magnet synchronous motors for real-time thermal management Type de document : texte imprimé Auteurs : Wilson, S.D., Auteur ; Stewart, P., Auteur ; Taylor, B. P., Auteur Année de publication : 2011 Article en page(s) : pp. 698 - 707 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : machine  windings;  parameter  estimation;  permanent  magnet  motors;  synchronous  motor  drives;  thermal  management  (packaging) Résumé : Real-time thermal management of electrical machines relies on sufficiently accurate indicators of internal temperature. One indicator of temperature in a permanent-magnet synchronous motor (PMSM) is the stator winding resistance. Detection of PMSM winding resistance in the literature has been made on machines with relatively high resistances, where the resistive voltage vector is significant under load. This paper describes two techniques, which can be applied to detect the winding resistance, through “angle” and “magnitude” current injection. Two further methods are described, which discriminate injected current and voltages from motoring currents and voltages: “unipolar” and “bipolar” separation. These enable the resistance to be determined, and hence the winding temperature in permanent-magnet machines. These methods can be applied under load, and in a manner that does not disturb motor torque or speed. The method distinguishes between changes in the electromotive force constant and the resistive voltage. This paper introduces the techniques, while a companion paper covers the application of one of the methods to a PMSM drive system. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5546935&sortType%3Das [...] [article] Methods of resistance estimation in permanent magnet synchronous motors for real-time thermal management [texte imprimé] / Wilson, S.D., Auteur ; Stewart, P., Auteur ; Taylor, B. P., Auteur . - 2011 . - pp. 698 - 707. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 698 - 707 Mots-clés : machine  windings;  parameter  estimation;  permanent  magnet  motors;  synchronous  motor  drives;  thermal  management  (packaging) Résumé : Real-time thermal management of electrical machines relies on sufficiently accurate indicators of internal temperature. One indicator of temperature in a permanent-magnet synchronous motor (PMSM) is the stator winding resistance. Detection of PMSM winding resistance in the literature has been made on machines with relatively high resistances, where the resistive voltage vector is significant under load. This paper describes two techniques, which can be applied to detect the winding resistance, through “angle” and “magnitude” current injection. Two further methods are described, which discriminate injected current and voltages from motoring currents and voltages: “unipolar” and “bipolar” separation. These enable the resistance to be determined, and hence the winding temperature in permanent-magnet machines. These methods can be applied under load, and in a manner that does not disturb motor torque or speed. The method distinguishes between changes in the electromotive force constant and the resistive voltage. This paper introduces the techniques, while a companion paper covers the application of one of the methods to a PMSM drive system. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5546935&sortType%3Das [...]

Scheduling of major investments for a steam-generating unit using a stochastic model / Sakowicz, B. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 708 - 714 Titre : Scheduling of major investments for a steam-generating unit using a stochastic model Type de document : texte imprimé Auteurs : Sakowicz, B., Auteur ; Stopczyk, M., Auteur ; Anders, G. J., Auteur Année de publication : 2011 Article en page(s) : pp. 708 - 714 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Internet;  Monte  Carlo  methods;  maintenance  engineering;  power  engineering  computing;  power  generation  economics;  steam  power  stations Résumé : This paper compares and analyzes the economics of alternative maintenance plans for generating stations. The usual life-cycle investment decisions for power plant equipment involve definition of alternative scenarios with specified refurbishment dates. The aim of the paper is to present a method for the selection of optimal investment dates that minimizes the life-cycle cost of the analyzed equipment. The system is introduced as a distributed web-based software application. The methodology based on combining evolutionary programming with Monte Carlo simulations is described and illustrated by a numerical example involving analysis of the optimal timing of new investments for refurbishment of a large generator at a thermal-generating plant. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5523923&sortType%3Das [...] [article] Scheduling of major investments for a steam-generating unit using a stochastic model [texte imprimé] / Sakowicz, B., Auteur ; Stopczyk, M., Auteur ; Anders, G. J., Auteur . - 2011 . - pp. 708 - 714. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 708 - 714 Mots-clés : Internet;  Monte  Carlo  methods;  maintenance  engineering;  power  engineering  computing;  power  generation  economics;  steam  power  stations Résumé : This paper compares and analyzes the economics of alternative maintenance plans for generating stations. The usual life-cycle investment decisions for power plant equipment involve definition of alternative scenarios with specified refurbishment dates. The aim of the paper is to present a method for the selection of optimal investment dates that minimizes the life-cycle cost of the analyzed equipment. The system is introduced as a distributed web-based software application. The methodology based on combining evolutionary programming with Monte Carlo simulations is described and illustrated by a numerical example involving analysis of the optimal timing of new investments for refurbishment of a large generator at a thermal-generating plant. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5523923&sortType%3Das [...]

Condition monitoring of the power output of wind turbine generators using wavelets / Watson, S.J. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 715 - 721 Titre : Condition monitoring of the power output of wind turbine generators using wavelets Type de document : texte imprimé Auteurs : Watson, S.J., Auteur ; Xiang, B.J., Auteur ; Wenxian, Yang, Auteur Année de publication : 2011 Article en page(s) : pp. 715 - 721 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : asynchronous  generators;  condition  monitoring;  fault  diagnosis;  power  generation  faults;  turbogenerators;  wavelet  transforms;  wind  turbines Résumé : With an increasing number of wind turbines being erected offshore, there is a need for cost-effective, predictive, and proactive maintenance. A large fraction of wind turbine downtime is due to bearing failures, particularly in the generator and gearbox. One way of assessing impending problems is to install vibration sensors in key positions on these subassemblies. Such equipment can be costly and requires sophisticated software for analysis of the data. An alternative approach, which does not require extra sensors, is investigated in this paper. This involves monitoring the power output of a variable-speed wind turbine generator and processing the data using a wavelet in order to extract the strength of particular frequency components, characteristic of faults. This has been done for doubly fed induction generators (DFIGs), commonly used in modern variable-speed wind turbines. The technique is first validated on a test rig under controlled fault conditions and then is applied to two operational wind turbine DFIGs where generator shaft misalignment was detected. For one of these turbines, the technique detected a problem 3 months before a bearing failure was recorded. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5422657&sortType%3Das [...] [article] Condition monitoring of the power output of wind turbine generators using wavelets [texte imprimé] / Watson, S.J., Auteur ; Xiang, B.J., Auteur ; Wenxian, Yang, Auteur . - 2011 . - pp. 715 - 721. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 715 - 721 Mots-clés : asynchronous  generators;  condition  monitoring;  fault  diagnosis;  power  generation  faults;  turbogenerators;  wavelet  transforms;  wind  turbines Résumé : With an increasing number of wind turbines being erected offshore, there is a need for cost-effective, predictive, and proactive maintenance. A large fraction of wind turbine downtime is due to bearing failures, particularly in the generator and gearbox. One way of assessing impending problems is to install vibration sensors in key positions on these subassemblies. Such equipment can be costly and requires sophisticated software for analysis of the data. An alternative approach, which does not require extra sensors, is investigated in this paper. This involves monitoring the power output of a variable-speed wind turbine generator and processing the data using a wavelet in order to extract the strength of particular frequency components, characteristic of faults. This has been done for doubly fed induction generators (DFIGs), commonly used in modern variable-speed wind turbines. The technique is first validated on a test rig under controlled fault conditions and then is applied to two operational wind turbine DFIGs where generator shaft misalignment was detected. For one of these turbines, the technique detected a problem 3 months before a bearing failure was recorded. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5422657&sortType%3Das [...]

Direct rotor current-mode control improves the transient response of doubly fed induction generator-based wind turbines / Castilla, M. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 722 - 731 Titre : Direct rotor current-mode control improves the transient response of doubly fed induction generator-based wind turbines Type de document : texte imprimé Auteurs : Castilla, M., Auteur ; Miret, J., Auteur ; Matas, J., Auteur Année de publication : 2011 Article en page(s) : pp. 722 - 731 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : asynchronous  generators;  electric  current  control;  machine  control;  power  convertors;  power  generation  faults;  rotors;  transient  response;  wind  power  plants;  wind  turbines Résumé : The transient response is actually a critical dynamic characteristic of doubly fed induction generator-based wind turbines, especially in the presence of fast transient events, such as, for example, faults in the power system. This paper presents a direct rotor current-mode control (CMC) for the rotor-side converter of these induction generators, which is aimed to improve the transient response in relation to the dynamic performance achieved with the conventional (indirect) CMC. The theoretical study considers two grid fault scenarios, with balanced and unbalanced voltages, and presents a direct rotor CMC scheme for each situation. These control schemes are compared in terms of performance and cost with the indirect CMC schemes. The theoretical contribution of this paper is validated by means of selected simulation results from a 9-MW grid-connected wind power generation system. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5497120&sortType%3Das [...] [article] Direct rotor current-mode control improves the transient response of doubly fed induction generator-based wind turbines [texte imprimé] / Castilla, M., Auteur ; Miret, J., Auteur ; Matas, J., Auteur . - 2011 . - pp. 722 - 731. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 722 - 731 Mots-clés : asynchronous  generators;  electric  current  control;  machine  control;  power  convertors;  power  generation  faults;  rotors;  transient  response;  wind  power  plants;  wind  turbines Résumé : The transient response is actually a critical dynamic characteristic of doubly fed induction generator-based wind turbines, especially in the presence of fast transient events, such as, for example, faults in the power system. This paper presents a direct rotor current-mode control (CMC) for the rotor-side converter of these induction generators, which is aimed to improve the transient response in relation to the dynamic performance achieved with the conventional (indirect) CMC. The theoretical study considers two grid fault scenarios, with balanced and unbalanced voltages, and presents a direct rotor CMC scheme for each situation. These control schemes are compared in terms of performance and cost with the indirect CMC schemes. The theoretical contribution of this paper is validated by means of selected simulation results from a 9-MW grid-connected wind power generation system. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5497120&sortType%3Das [...]

Structural flexibility / Shrestha, G. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 732 - 740 Titre : Structural flexibility : a solution for weight reduction of large direct-drive wind-turbine generators Type de document : texte imprimé Auteurs : Shrestha, G., Auteur ; Polinder, H., Auteur ; Deok-je Bang, Auteur Année de publication : 2011 Article en page(s) : pp. 732 - 740 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : electric  drives;  magnetic  bearings;  turbogenerators;  wind  turbines Résumé : This paper looks into a new concept for reducing the structural weight of large direct-drive generators used in wind turbines. The concept uses magnetic bearings to position the rotor of the generator. The use of magnetic bearings allows structural flexibility in the generator. The weight of the rotor using the new concept is compared to the weight of a rotor designed with conventional methods. For a 5-MW generator, the result is that the structural weight of the rotor reduces by 45%. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5484469&sortType%3Das [...] [article] Structural flexibility : a solution for weight reduction of large direct-drive wind-turbine generators [texte imprimé] / Shrestha, G., Auteur ; Polinder, H., Auteur ; Deok-je Bang, Auteur . - 2011 . - pp. 732 - 740. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 732 - 740 Mots-clés : electric  drives;  magnetic  bearings;  turbogenerators;  wind  turbines Résumé : This paper looks into a new concept for reducing the structural weight of large direct-drive generators used in wind turbines. The concept uses magnetic bearings to position the rotor of the generator. The use of magnetic bearings allows structural flexibility in the generator. The weight of the rotor using the new concept is compared to the weight of a rotor designed with conventional methods. For a 5-MW generator, the result is that the structural weight of the rotor reduces by 45%. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5484469&sortType%3Das [...]

A systems approach for a stand-alone residential fuel cell power inverter design / Selamogullari, U.S. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 741 - 749 Titre : A systems approach for a stand-alone residential fuel cell power inverter design Type de document : texte imprimé Auteurs : Selamogullari, U.S., Auteur ; Torrey, D. A., Auteur ; Salon, S., Auteur Année de publication : 2011 Article en page(s) : pp. 741 - 749 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : field  effect  transistor  switches;  fuel  cell  power  plants;  invertors;  power  semiconductor  switches Résumé : Analysis of an experimentally measured daily load profile reveals that the residential power demand has a high percentage of low power duration over a day. In a stand-alone residential fuel cell power system, the power inverter designed for the peak power requirement will be operating at light loads, where its efficiency is lower, most of the time. Thus, improving the light-load efficiency will provide considerable hydrogen (energy) savings for the stand-alone residential power system. A solution to improve the power inverter efficiency at light loads is proposed. Both simulation and experimental results are given. Results show that the light-load efficiency can be improved by employing and uniquely controlling a parallel IGBT-MOSFET switch combination in a half-bridge inverter topology. It is also shown that substantial savings on hydrogen usage can be realized through the use of new inverter design in stand-alone operations. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552155&sortType%3Das [...] [article] A systems approach for a stand-alone residential fuel cell power inverter design [texte imprimé] / Selamogullari, U.S., Auteur ; Torrey, D. A., Auteur ; Salon, S., Auteur . - 2011 . - pp. 741 - 749. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 741 - 749 Mots-clés : field  effect  transistor  switches;  fuel  cell  power  plants;  invertors;  power  semiconductor  switches Résumé : Analysis of an experimentally measured daily load profile reveals that the residential power demand has a high percentage of low power duration over a day. In a stand-alone residential fuel cell power system, the power inverter designed for the peak power requirement will be operating at light loads, where its efficiency is lower, most of the time. Thus, improving the light-load efficiency will provide considerable hydrogen (energy) savings for the stand-alone residential power system. A solution to improve the power inverter efficiency at light loads is proposed. Both simulation and experimental results are given. Results show that the light-load efficiency can be improved by employing and uniquely controlling a parallel IGBT-MOSFET switch combination in a half-bridge inverter topology. It is also shown that substantial savings on hydrogen usage can be realized through the use of new inverter design in stand-alone operations. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552155&sortType%3Das [...]

Minimum-threshold crowbar for a fault-ride-through grid-code-compliant DFIG wind turbine / Pannell, G. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 750 - 759 Titre : Minimum-threshold crowbar for a fault-ride-through grid-code-compliant DFIG wind turbine Type de document : texte imprimé Auteurs : Pannell, G., Auteur ; Atkinson, D. J., Auteur ; Zahawi, B., Auteur Année de publication : 2011 Article en page(s) : pp. 750 - 759 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : asynchronous  generators;  fault  diagnosis;  overcurrent  protection;  overvoltage  protection;  power  generation  economics;  power  generation  protection;  wind  turbines Résumé : Doubly fed induction generator (DFIG) technology is the dominant technology in the growing global market for wind power generation, due to the combination of variable-speed operation and a cost-effective partially rated power converter. However, the DFIG is sensitive to dips in supply voltage and without specific protection to “ride-through” grid faults, a DFIG risks damage to its power converter due to overcurrent and/or overvoltage. Conventional converter protection via a sustained period of rotor-crowbar closed circuit leads to poor power output and sustained suppression of the stator voltages. A new minimum-threshold rotor-crowbar method is presented in this paper, improving fault response by reducing crowbar application periods to 11-16 ms, successfully diverting transient overcurrents, and restoring good power control within 45 ms of both fault initiation and clearance, thus enabling the DFIG to meet grid-code fault-ride-through requirements. The new method is experimentally verified and evaluated using a 7.5-kW test facility. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5484719&sortType%3Das [...] [article] Minimum-threshold crowbar for a fault-ride-through grid-code-compliant DFIG wind turbine [texte imprimé] / Pannell, G., Auteur ; Atkinson, D. J., Auteur ; Zahawi, B., Auteur . - 2011 . - pp. 750 - 759. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 750 - 759 Mots-clés : asynchronous  generators;  fault  diagnosis;  overcurrent  protection;  overvoltage  protection;  power  generation  economics;  power  generation  protection;  wind  turbines Résumé : Doubly fed induction generator (DFIG) technology is the dominant technology in the growing global market for wind power generation, due to the combination of variable-speed operation and a cost-effective partially rated power converter. However, the DFIG is sensitive to dips in supply voltage and without specific protection to “ride-through” grid faults, a DFIG risks damage to its power converter due to overcurrent and/or overvoltage. Conventional converter protection via a sustained period of rotor-crowbar closed circuit leads to poor power output and sustained suppression of the stator voltages. A new minimum-threshold rotor-crowbar method is presented in this paper, improving fault response by reducing crowbar application periods to 11-16 ms, successfully diverting transient overcurrents, and restoring good power control within 45 ms of both fault initiation and clearance, thus enabling the DFIG to meet grid-code fault-ride-through requirements. The new method is experimentally verified and evaluated using a 7.5-kW test facility. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5484719&sortType%3Das [...]

Design methodology for a SEAREV wave energy converter / Ruellan, M. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 760 - 767 Titre : Design methodology for a SEAREV wave energy converter Type de document : texte imprimé Auteurs : Ruellan, M., Auteur ; BenAhmed, H., Auteur ; Multon, B., Auteur Année de publication : 2011 Article en page(s) : pp. 760 - 767 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Hydroelectric  generators;  power  convertors;  wave  power  generation Résumé : This paper will begin by presenting two power takeoff (PTO) technologies for the SEAREV wave energy converter (WEC) followed by the design methodology applied to electromagnetic generator cycles for the all-electric solution. The operating principle associated with the SEAREV WEC will be described before discussing the two conversion technologies intended to transform wave energy into electricity. The types of systems are twofold: hydroelectric and all-electric. The strong coupling between the hydrodynamic, mechanical, and electrical phenomena heavily influences the behavior of the recovery (PTO) system and leads to a complex system design that requires a full-scale modeling description. A unique design methodology for the all-electric conversion chain has been developed around several distinct control modes, including one featuring power leveling. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552154&sortType%3Das [...] [article] Design methodology for a SEAREV wave energy converter [texte imprimé] / Ruellan, M., Auteur ; BenAhmed, H., Auteur ; Multon, B., Auteur . - 2011 . - pp. 760 - 767. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 760 - 767 Mots-clés : Hydroelectric  generators;  power  convertors;  wave  power  generation Résumé : This paper will begin by presenting two power takeoff (PTO) technologies for the SEAREV wave energy converter (WEC) followed by the design methodology applied to electromagnetic generator cycles for the all-electric solution. The operating principle associated with the SEAREV WEC will be described before discussing the two conversion technologies intended to transform wave energy into electricity. The types of systems are twofold: hydroelectric and all-electric. The strong coupling between the hydrodynamic, mechanical, and electrical phenomena heavily influences the behavior of the recovery (PTO) system and leads to a complex system design that requires a full-scale modeling description. A unique design methodology for the all-electric conversion chain has been developed around several distinct control modes, including one featuring power leveling. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552154&sortType%3Das [...]

Modeling and simulation of PEM fuel cell thermal behavior on parallel computers / Salah, A. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 768 - 777 Titre : Modeling and simulation of PEM fuel cell thermal behavior on parallel computers Type de document : texte imprimé Auteurs : Salah, A., Auteur ; Gaber, J., Auteur ; Outbib, R., Auteur Année de publication : 2011 Article en page(s) : pp. 768 - 777 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : C  language;  message  passing;  partial  differential  equations;  power  engineering  computing;  proton  exchange  membrane  fuel  cells;  synchronisation Résumé : Proton exchange membrane fuel cells (PEMFCs) have aroused great interest in recent years, in particular for transportation applications. However, fuel cell (FC) technology is not yet ready for large-scale commercial use, as it requires more understanding and intensive development, in particular in the thermal behavior area. Such understanding of the FC requires many large-scale simulations that can take unacceptably large execution time. This is especially true when using traditional models that are governed by heat equations and based on computational tools that derive approximate solutions to partial differential equations. Such multimodel systems also require synchronization that results in overhead. Instead, in this paper, a new fully integrated modeling approach that lends itself to parallelism is introduced. This approach can benefit from advances in parallel computing, and thus dramatically reduce time and enable multiple large simulations. This is called the global nodal method, which is intended to analyze and simulate the thermal behavior of PEMFCs. Parallel simulations are implemented with the message passing interface (MPI) and using the unified parallel C (UPC) language on parallel systems. It will be shown that computation time to conduct thermal behavior in large-scale simulation using MPI and UPC is significantly reduced compared to sequential simulations, and obtained data are highly precise and accurate. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552146&sortType%3Das [...] [article] Modeling and simulation of PEM fuel cell thermal behavior on parallel computers [texte imprimé] / Salah, A., Auteur ; Gaber, J., Auteur ; Outbib, R., Auteur . - 2011 . - pp. 768 - 777. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 768 - 777 Mots-clés : C  language;  message  passing;  partial  differential  equations;  power  engineering  computing;  proton  exchange  membrane  fuel  cells;  synchronisation Résumé : Proton exchange membrane fuel cells (PEMFCs) have aroused great interest in recent years, in particular for transportation applications. However, fuel cell (FC) technology is not yet ready for large-scale commercial use, as it requires more understanding and intensive development, in particular in the thermal behavior area. Such understanding of the FC requires many large-scale simulations that can take unacceptably large execution time. This is especially true when using traditional models that are governed by heat equations and based on computational tools that derive approximate solutions to partial differential equations. Such multimodel systems also require synchronization that results in overhead. Instead, in this paper, a new fully integrated modeling approach that lends itself to parallelism is introduced. This approach can benefit from advances in parallel computing, and thus dramatically reduce time and enable multiple large simulations. This is called the global nodal method, which is intended to analyze and simulate the thermal behavior of PEMFCs. Parallel simulations are implemented with the message passing interface (MPI) and using the unified parallel C (UPC) language on parallel systems. It will be shown that computation time to conduct thermal behavior in large-scale simulation using MPI and UPC is significantly reduced compared to sequential simulations, and obtained data are highly precise and accurate. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552146&sortType%3Das [...]

Equivalent electric circuit modeling and performance analysis of a PEM fuel cell stack using impedance spectroscopy / Dhirde, A. M. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 778 - 786 Titre : Equivalent electric circuit modeling and performance analysis of a PEM fuel cell stack using impedance spectroscopy Type de document : texte imprimé Auteurs : Dhirde, A. M., Auteur ; Dale, N. V., Auteur ; Salehfar, H., Auteur Année de publication : 2011 Article en page(s) : pp. 778 - 786 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Anodes;  cathodes;  electrochemical  impedance  spectroscopy;  equivalent  circuits;  least  squares  approximations;  proton  exchange  membrane  fuel  cells Résumé : In this paper, equivalent electric circuit models of a commercial 1.2-kW proton exchange membrane (PEM) fuel cell stack are proposed based on AC impedance studies. The PEM fuel cell stack was operated using room air and pure hydrogen (99.995%). Using electrochemical impedance spectroscopy (EIS) technique, impedance data were collected in the laboratory under various loading conditions. Impedance data were analyzed and circuit models developed using basic circuit elements like resistors and inductors, and distributed elements such as Warburg and constant-phase elements. A nonlinear least-square fitting technique is employed to obtain the circuit parameters by fitting a curve to the experimental impedance data. Two circuit models of the fuel cell, one for low and one for high currents are proposed. The average ohmic resistance for the whole stack is estimated to be 41 mΩ. Double-layer capacitances are determined at anode and cathode at various current densities. As expected, cathode charge transfer resistance turns out to be much higher than the anode charge transfer resistance because of slower kinetics of the oxygen reduction reaction. At higher load currents, a significant increase in mass transfer resistance as well as low-frequency inductive effects is observed. These low-frequency inductive effects are recognized and modeled in the fuel cell models of this work. Finally, a semiquantitative analysis was used to determine the contribution of individual performance factors to the overall fuel cell voltage drop. The transient response of the fuel cell circuit models is simulated using MATLAB/Simulink and their performance is validated by comparison with experimental data. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5523924&sortType%3Das [...] [article] Equivalent electric circuit modeling and performance analysis of a PEM fuel cell stack using impedance spectroscopy [texte imprimé] / Dhirde, A. M., Auteur ; Dale, N. V., Auteur ; Salehfar, H., Auteur . - 2011 . - pp. 778 - 786. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 778 - 786 Mots-clés : Anodes;  cathodes;  electrochemical  impedance  spectroscopy;  equivalent  circuits;  least  squares  approximations;  proton  exchange  membrane  fuel  cells Résumé : In this paper, equivalent electric circuit models of a commercial 1.2-kW proton exchange membrane (PEM) fuel cell stack are proposed based on AC impedance studies. The PEM fuel cell stack was operated using room air and pure hydrogen (99.995%). Using electrochemical impedance spectroscopy (EIS) technique, impedance data were collected in the laboratory under various loading conditions. Impedance data were analyzed and circuit models developed using basic circuit elements like resistors and inductors, and distributed elements such as Warburg and constant-phase elements. A nonlinear least-square fitting technique is employed to obtain the circuit parameters by fitting a curve to the experimental impedance data. Two circuit models of the fuel cell, one for low and one for high currents are proposed. The average ohmic resistance for the whole stack is estimated to be 41 mΩ. Double-layer capacitances are determined at anode and cathode at various current densities. As expected, cathode charge transfer resistance turns out to be much higher than the anode charge transfer resistance because of slower kinetics of the oxygen reduction reaction. At higher load currents, a significant increase in mass transfer resistance as well as low-frequency inductive effects is observed. These low-frequency inductive effects are recognized and modeled in the fuel cell models of this work. Finally, a semiquantitative analysis was used to determine the contribution of individual performance factors to the overall fuel cell voltage drop. The transient response of the fuel cell circuit models is simulated using MATLAB/Simulink and their performance is validated by comparison with experimental data. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5523924&sortType%3Das [...]

Optimal control of battery energy storage for wind farm dispatching / Teleke, S. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 787 - 794 Titre : Optimal control of battery energy storage for wind farm dispatching Type de document : texte imprimé Auteurs : Teleke, S., Auteur ; Baran, M.E., Auteur ; Bhattacharya, S., Auteur Année de publication : 2011 Article en page(s) : pp. 787 - 794 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Battery  storage  plants;  load  dispatching;  open  loop  systems;  optimal  control;  predictive  control;  wind  power  plants Résumé : Integrating a battery energy storage system (BESS) with a large wind farm can make a wind farm more dispatchable. This paper focuses on development of a control strategy for optimal use of the BESS for this purpose. The paper considers an open-loop optimal control scheme to incorporate the operating constraints of the BESS, such as state of charge limits, charge/discharge current limits, and lifetime. The goal of the control is to have the BESS to provide as much smoothing as possible, so that the wind farm can be dispatched on an hourly basis based on the forecasted wind conditions. The effectiveness of this control strategy has been tested by using an actual wind farm data. Furthermore, a real-time implementation strategy using model predictive control is also proposed. Finally, it is shown that the control strategy is very important in improving the BESS performance for this application. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5432995&sortType%3Das [...] [article] Optimal control of battery energy storage for wind farm dispatching [texte imprimé] / Teleke, S., Auteur ; Baran, M.E., Auteur ; Bhattacharya, S., Auteur . - 2011 . - pp. 787 - 794. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 787 - 794 Mots-clés : Battery  storage  plants;  load  dispatching;  open  loop  systems;  optimal  control;  predictive  control;  wind  power  plants Résumé : Integrating a battery energy storage system (BESS) with a large wind farm can make a wind farm more dispatchable. This paper focuses on development of a control strategy for optimal use of the BESS for this purpose. The paper considers an open-loop optimal control scheme to incorporate the operating constraints of the BESS, such as state of charge limits, charge/discharge current limits, and lifetime. The goal of the control is to have the BESS to provide as much smoothing as possible, so that the wind farm can be dispatched on an hourly basis based on the forecasted wind conditions. The effectiveness of this control strategy has been tested by using an actual wind farm data. Furthermore, a real-time implementation strategy using model predictive control is also proposed. Finally, it is shown that the control strategy is very important in improving the BESS performance for this application. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5432995&sortType%3Das [...]

A novel instantaneous torque control scheme for induction generator systems / Yuwen, Hu in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 795 - 803 Titre : A novel instantaneous torque control scheme for induction generator systems Type de document : texte imprimé Auteurs : Yuwen, Hu, Auteur ; Wenxin Huang, Auteur ; Li Yong, Auteur Année de publication : 2011 Article en page(s) : pp. 795 - 803 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Asynchronous  generators;  machine  control;  torque  control;  voltage  control Résumé : In this paper, a novel instantaneous torque control is proposed to control the output voltage of a stand-alone induction generator. The output voltage regulation is achieved by the fast control of the space voltage vector based on the information of the output voltage and output current, which leads to a better system dynamic performance. The simulation and experimental results verify the effectiveness of the proposed scheme. The control scheme for the voltage buildup process is investigated as well. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552144&sortType%3Das [...] [article] A novel instantaneous torque control scheme for induction generator systems [texte imprimé] / Yuwen, Hu, Auteur ; Wenxin Huang, Auteur ; Li Yong, Auteur . - 2011 . - pp. 795 - 803. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 795 - 803 Mots-clés : Asynchronous  generators;  machine  control;  torque  control;  voltage  control Résumé : In this paper, a novel instantaneous torque control is proposed to control the output voltage of a stand-alone induction generator. The output voltage regulation is achieved by the fast control of the space voltage vector based on the information of the output voltage and output current, which leads to a better system dynamic performance. The simulation and experimental results verify the effectiveness of the proposed scheme. The control scheme for the voltage buildup process is investigated as well. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552144&sortType%3Das [...]

State-space modeling of proton exchange membrane fuel cell / Puranik, S.V. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 804 - 813 Titre : State-space modeling of proton exchange membrane fuel cell Type de document : texte imprimé Auteurs : Puranik, S.V., Auteur ; Keyhani, A., Auteur ; Khorrami, F., Auteur Année de publication : 2011 Article en page(s) : pp. 804 - 813 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Proton  exchange  membrane  fuel  cells;  state-space  methods Résumé : In this paper, a nonlinear state-space model of the 500-W proton exchange membrane (PEM) fuel cell is developed. The open-circuit output voltage of the PEM fuel cell, mass balance, and thermodynamic energy balance inside the PEM fuel cell, voltage losses in the PEM fuel cell, along with the formation of a double layer charge in the PEM fuel cell system are modeled. The model is simulated in MATLAB/Simulink, and the transient response of the PEM fuel cell model over short and long time periods is analyzed. Also, the behavior of the model under the resistive load is studied, and the results are shown. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5499038&sortType%3Das [...] [article] State-space modeling of proton exchange membrane fuel cell [texte imprimé] / Puranik, S.V., Auteur ; Keyhani, A., Auteur ; Khorrami, F., Auteur . - 2011 . - pp. 804 - 813. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 804 - 813 Mots-clés : Proton  exchange  membrane  fuel  cells;  state-space  methods Résumé : In this paper, a nonlinear state-space model of the 500-W proton exchange membrane (PEM) fuel cell is developed. The open-circuit output voltage of the PEM fuel cell, mass balance, and thermodynamic energy balance inside the PEM fuel cell, voltage losses in the PEM fuel cell, along with the formation of a double layer charge in the PEM fuel cell system are modeled. The model is simulated in MATLAB/Simulink, and the transient response of the PEM fuel cell model over short and long time periods is analyzed. Also, the behavior of the model under the resistive load is studied, and the results are shown. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5499038&sortType%3Das [...]

Analytical expressions for DG allocation in primary distribution networks / Duong Quoc Hung in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 814 - 820 Titre : Analytical expressions for DG allocation in primary distribution networks Type de document : texte imprimé Auteurs : Duong Quoc Hung, Auteur ; Mithulananthan, N., Auteur ; Bansal, R. C., Auteur Année de publication : 2011 Article en page(s) : pp. 814 - 820 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Distributed  power  generation;  distribution  networks;  load  flow;  power  factor Résumé : This paper proposes analytical expressions for finding optimal size and power factor of four types of distributed generation (DG) units. DG units are sized to achieve the highest loss reduction in distribution networks. The proposed analytical expressions are based on an improvement to the method that was limited to DG type, which is capable of delivering real power only. Three other types, e.g., DG capable of delivering both real and reactive power, DG capable of delivering real power and absorbing reactive power, and DG capable of delivering reactive power only, can also be identified with their optimal size and location using the proposed method. The method has been tested in three test distribution systems with varying size and complexity and validated using exhaustive method. Results show that the proposed method requires less computation, but can lead optimal solution as verified by the exhaustive load flow method. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552152&sortType%3Das [...] [article] Analytical expressions for DG allocation in primary distribution networks [texte imprimé] / Duong Quoc Hung, Auteur ; Mithulananthan, N., Auteur ; Bansal, R. C., Auteur . - 2011 . - pp. 814 - 820. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 814 - 820 Mots-clés : Distributed  power  generation;  distribution  networks;  load  flow;  power  factor Résumé : This paper proposes analytical expressions for finding optimal size and power factor of four types of distributed generation (DG) units. DG units are sized to achieve the highest loss reduction in distribution networks. The proposed analytical expressions are based on an improvement to the method that was limited to DG type, which is capable of delivering real power only. Three other types, e.g., DG capable of delivering both real and reactive power, DG capable of delivering real power and absorbing reactive power, and DG capable of delivering reactive power only, can also be identified with their optimal size and location using the proposed method. The method has been tested in three test distribution systems with varying size and complexity and validated using exhaustive method. Results show that the proposed method requires less computation, but can lead optimal solution as verified by the exhaustive load flow method. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552152&sortType%3Das [...]

Development and validation of a battery model useful for discharging and charging power control and lifetime estimation / Agarwal, V. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 821 - 835 Titre : Development and validation of a battery model useful for discharging and charging power control and lifetime estimation Type de document : texte imprimé Auteurs : Agarwal, V., Auteur ; Uthaichana, K., Auteur ; DeCarlo, R. A., Auteur Année de publication : 2011 Article en page(s) : pp. 821 - 835 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Battery  management  systems;  battery  powered  vehicles;  lead  acid  batteries Résumé : Accurate information on battery state-of-charge, expected battery lifetime, and expected battery cycle life is essential for many practical applications. In this paper, we develop a nonchemically based partially linearized (in battery power) input-output battery model, initially developed for lead-acid batteries in a hybrid electric vehicle. We show that with properly tuned parameter values, the model can be extended to different battery types, such as lithium-ion, nickel-metal hydride, and alkaline. The validation results of the model against measured data in terms of power and efficiency at different temperatures are then presented. The model is incorporated with the recovery effect for accurate lifetime estimation. The obtained lifetime estimation results using the proposed model are similar to the ones predicted by the Rakhmatov and Virudhula battery model on a given set of typical loads at room temperature. A possible incorporation of the cycling effect, which determines the battery cycle life, in terms of the maximum available energy approximated at charge/discharge nominal power level is also suggested. The usage of the proposed model is computationally inexpensive, hence implementable in many applications, such as low-power system design, real-time energy management in distributed sensor network, etc. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552150&sortType%3Das [...] [article] Development and validation of a battery model useful for discharging and charging power control and lifetime estimation [texte imprimé] / Agarwal, V., Auteur ; Uthaichana, K., Auteur ; DeCarlo, R. A., Auteur . - 2011 . - pp. 821 - 835. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 821 - 835 Mots-clés : Battery  management  systems;  battery  powered  vehicles;  lead  acid  batteries Résumé : Accurate information on battery state-of-charge, expected battery lifetime, and expected battery cycle life is essential for many practical applications. In this paper, we develop a nonchemically based partially linearized (in battery power) input-output battery model, initially developed for lead-acid batteries in a hybrid electric vehicle. We show that with properly tuned parameter values, the model can be extended to different battery types, such as lithium-ion, nickel-metal hydride, and alkaline. The validation results of the model against measured data in terms of power and efficiency at different temperatures are then presented. The model is incorporated with the recovery effect for accurate lifetime estimation. The obtained lifetime estimation results using the proposed model are similar to the ones predicted by the Rakhmatov and Virudhula battery model on a given set of typical loads at room temperature. A possible incorporation of the cycling effect, which determines the battery cycle life, in terms of the maximum available energy approximated at charge/discharge nominal power level is also suggested. The usage of the proposed model is computationally inexpensive, hence implementable in many applications, such as low-power system design, real-time energy management in distributed sensor network, etc. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552150&sortType%3Das [...]

Feed-forward transient current control for low-voltage ride-through enhancement of DFIG wind turbines / Jiaqi Liang in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 836 - 843 Titre : Feed-forward transient current control for low-voltage ride-through enhancement of DFIG wind turbines Type de document : texte imprimé Auteurs : Jiaqi Liang, Auteur ; Qiao, Wei, Auteur ; Harley, R.G., Auteur Année de publication : 2011 Article en page(s) : pp. 836 - 843 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Asynchronous  generators;  electric  current  control;  fault  diagnosis;  feedforward;  power  grids;  transient  analysis;  wind  turbines Résumé : High penetration of wind power requires reliable wind energy generation. A successful low-voltage ride-through (LVRT) scheme is a key requirement to achieve reliable and uninterrupted electrical power generation for wind turbines equipped with doubly fed induction generators (DFIGs). This paper proposes a feed-forward transient current control (FFTCC) scheme for the rotor side converter (RSC) of a DFIG to enhance its LVRT capability. This new control scheme introduces additional feed-forward transient compensations to a conventional current regulator. When three phase faults occur, these compensation terms correctly align the RSC ac-side output voltage with the transient-induced voltage, resulting in minimum transient rotor current and minimum occurrence of crowbar interruptions. With little additional computational effort, the proposed control scheme helps relieve the transient current stress on the RSC and helps maintain an uninterrupted active and reactive power supply from the wind turbines to the power grid. Simulation results are shown to demonstrate the effectiveness of the proposed FFTCC scheme in suppressing transient rotor currents. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552142&sortType%3Das [...] [article] Feed-forward transient current control for low-voltage ride-through enhancement of DFIG wind turbines [texte imprimé] / Jiaqi Liang, Auteur ; Qiao, Wei, Auteur ; Harley, R.G., Auteur . - 2011 . - pp. 836 - 843. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 836 - 843 Mots-clés : Asynchronous  generators;  electric  current  control;  fault  diagnosis;  feedforward;  power  grids;  transient  analysis;  wind  turbines Résumé : High penetration of wind power requires reliable wind energy generation. A successful low-voltage ride-through (LVRT) scheme is a key requirement to achieve reliable and uninterrupted electrical power generation for wind turbines equipped with doubly fed induction generators (DFIGs). This paper proposes a feed-forward transient current control (FFTCC) scheme for the rotor side converter (RSC) of a DFIG to enhance its LVRT capability. This new control scheme introduces additional feed-forward transient compensations to a conventional current regulator. When three phase faults occur, these compensation terms correctly align the RSC ac-side output voltage with the transient-induced voltage, resulting in minimum transient rotor current and minimum occurrence of crowbar interruptions. With little additional computational effort, the proposed control scheme helps relieve the transient current stress on the RSC and helps maintain an uninterrupted active and reactive power supply from the wind turbines to the power grid. Simulation results are shown to demonstrate the effectiveness of the proposed FFTCC scheme in suppressing transient rotor currents. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552142&sortType%3Das [...]

Fuzzy control of brushless excitation system for steam turbogenerators / Gunes, M. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 844 - 852 Titre : Fuzzy control of brushless excitation system for steam turbogenerators Type de document : texte imprimé Auteurs : Gunes, M., Auteur ; Dogru, N., Auteur Année de publication : 2011 Article en page(s) : pp. 844 - 852 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Boilers;  control  system  synthesis;  fuzzy  control;  power  generation  control;  steam  power  stations;  turbogenerators Résumé : This paper describes the control of fully automatic fuzzy-based algorithm for rotating diode excitation system for steam turbogenerators. The fuzzy controller was designed by using microcontroller unit having the selectable voltage and power factor modes. The designed excitation control system has been used instead of the old conventional excitation system. As a case study, 6 MW steam turbogenerator has been controlled and protected according to the capability curve and limitation values supplied by the manufacturer. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5420028&sortType%3Das [...] [article] Fuzzy control of brushless excitation system for steam turbogenerators [texte imprimé] / Gunes, M., Auteur ; Dogru, N., Auteur . - 2011 . - pp. 844 - 852. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 844 - 852 Mots-clés : Boilers;  control  system  synthesis;  fuzzy  control;  power  generation  control;  steam  power  stations;  turbogenerators Résumé : This paper describes the control of fully automatic fuzzy-based algorithm for rotating diode excitation system for steam turbogenerators. The fuzzy controller was designed by using microcontroller unit having the selectable voltage and power factor modes. The designed excitation control system has been used instead of the old conventional excitation system. As a case study, 6 MW steam turbogenerator has been controlled and protected according to the capability curve and limitation values supplied by the manufacturer. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5420028&sortType%3Das [...]

Modeling flexible operation mechanism of CO2 capture power plant and its effects on power-system operation / Qixin Chen in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 853 - 861 Titre : Modeling flexible operation mechanism of CO2 capture power plant and its effects on power-system operation Type de document : texte imprimé Auteurs : Qixin Chen, Auteur ; Chongqing Kang, Auteur ; Qing Xia, Auteur Année de publication : 2011 Article en page(s) : pp. 853 - 861 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : power  plants;  power  system  security Résumé : CO2 capture and storage (CCS) has been identified as a critical and promising option for power generation in a carbon-constrained world. Flexible-operation mechanism of CO2 capture power plant is of great significance no matter in enhancing economic returns of plant investment or in ensuring the secure operation of power system. In this paper, the feasibility, mechanism, and options of flexible operation in capture plant are first clarified. Then, based on a benchmark capture plant with postcombustion and solvent/sorbent separation technology, a generic quantitative model is established to formulate the process of CO2 capture and the interaction between capture system and generation system. Plant performances as well as its effects on power-system operation are examined, revealing the different characteristics between CO2 capture power plant and conventional noncapture plants. On this basis, typical operation modes of CO2-capture power plant are defined and identified. In the end, a numerical case is studied to testify the effectiveness of the proposed model. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5508573&sortType%3Das [...] [article] Modeling flexible operation mechanism of CO2 capture power plant and its effects on power-system operation [texte imprimé] / Qixin Chen, Auteur ; Chongqing Kang, Auteur ; Qing Xia, Auteur . - 2011 . - pp. 853 - 861. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 853 - 861 Mots-clés : power  plants;  power  system  security Résumé : CO2 capture and storage (CCS) has been identified as a critical and promising option for power generation in a carbon-constrained world. Flexible-operation mechanism of CO2 capture power plant is of great significance no matter in enhancing economic returns of plant investment or in ensuring the secure operation of power system. In this paper, the feasibility, mechanism, and options of flexible operation in capture plant are first clarified. Then, based on a benchmark capture plant with postcombustion and solvent/sorbent separation technology, a generic quantitative model is established to formulate the process of CO2 capture and the interaction between capture system and generation system. Plant performances as well as its effects on power-system operation are examined, revealing the different characteristics between CO2 capture power plant and conventional noncapture plants. On this basis, typical operation modes of CO2-capture power plant are defined and identified. In the end, a numerical case is studied to testify the effectiveness of the proposed model. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5508573&sortType%3Das [...]

Energetical modeling of lithium-ion batteries including electrode porosity effects / Urbain, M. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 862 - 872 Titre : Energetical modeling of lithium-ion batteries including electrode porosity effects Type de document : texte imprimé Auteurs : Urbain, M., Auteur ; Hinaje, M., Auteur ; Raël, S., Auteur Année de publication : 2011 Article en page(s) : pp. 862 - 872 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Electrochemical  electrodes;  lithium;  porosity;  secondary  cells Résumé : All electrochemical batteries are characterized by an electrical behavior that depends on temperature, state of charge, and current. In the case of lithium-ion accumulators, the energetical behavior is moreover deeply marked by line effects, due to the porosity of both electrodes. This paper deals with investigations on an accurate energetical modeling of lithium-ion battery. It is shown in particular that electrode porosity can be taken into account by means of a diffusion impedance represented by a capacitive transmission line. An energetical model, which couples this line with a current independent capacitance, is proposed and characterized at constant temperature (20°C) over different state-of-charge intervals (5%) and for different currents. Reactant diffusion within the electrolyte and relaxation period after discharge are investigated as well. Validation tests carried out on a 6.8-Ah lithium-ion element are conclusive. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5484532&sortType%3Das [...] [article] Energetical modeling of lithium-ion batteries including electrode porosity effects [texte imprimé] / Urbain, M., Auteur ; Hinaje, M., Auteur ; Raël, S., Auteur . - 2011 . - pp. 862 - 872. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 862 - 872 Mots-clés : Electrochemical  electrodes;  lithium;  porosity;  secondary  cells Résumé : All electrochemical batteries are characterized by an electrical behavior that depends on temperature, state of charge, and current. In the case of lithium-ion accumulators, the energetical behavior is moreover deeply marked by line effects, due to the porosity of both electrodes. This paper deals with investigations on an accurate energetical modeling of lithium-ion battery. It is shown in particular that electrode porosity can be taken into account by means of a diffusion impedance represented by a capacitive transmission line. An energetical model, which couples this line with a current independent capacitance, is proposed and characterized at constant temperature (20°C) over different state-of-charge intervals (5%) and for different currents. Reactant diffusion within the electrolyte and relaxation period after discharge are investigated as well. Validation tests carried out on a 6.8-Ah lithium-ion element are conclusive. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5484532&sortType%3Das [...]

Coordinated control approaches for low-voltage ride-through enhancement in wind turbines with doubly fed induction generators / Rahimi, M. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 873 - 883 Titre : Coordinated control approaches for low-voltage ride-through enhancement in wind turbines with doubly fed induction generators Type de document : texte imprimé Auteurs : Rahimi, M., Auteur ; Parniani, M., Auteur Année de publication : 2011 Article en page(s) : pp. 873 - 883 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Asynchronous  generators;  overvoltage;  power  convertors;  rotors;  torque  control;  transient  response;  wind  turbines Résumé : This paper deals with the coordinated control of rotor- and grid-side converters in wind turbines with doubly fed induction generators (DFIGs) to improve the low-voltage ride-through capability. The rotor-side converter control and additional equipment, called stator damping resistor, are used to limit the rotor inrush current and to reduce the oscillations and settling time of DFIG transient response during the voltage dip. Also, the grid-side converter is controlled to limit the dc-link overvoltage during the voltage drop. It is found that the dynamics of the grid-side converter and dc-link voltage exhibit nonminimum phase behavior, and thus there is an inherent limitation on the achievable dynamic response during the fault. Since the dc-link dynamics is nonlinear, the linear control scheme cannot properly limit the dc-link voltage under large voltage dips. Thus, a nonlinear control scheme applied to the grid-side converter is proposed, which stabilizes the internal dynamics and limits the dc-link voltage fluctuations during the fault. The proposed ride-through approaches limit the peak values of rotor current and dc-link voltage at the instants of occurring and clearing the fault. They also limit the oscillations of electromagnetic torque, and consequently, improve the DFIG voltage dip behavior. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552157&sortType%3Das [...] [article] Coordinated control approaches for low-voltage ride-through enhancement in wind turbines with doubly fed induction generators [texte imprimé] / Rahimi, M., Auteur ; Parniani, M., Auteur . - 2011 . - pp. 873 - 883. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 873 - 883 Mots-clés : Asynchronous  generators;  overvoltage;  power  convertors;  rotors;  torque  control;  transient  response;  wind  turbines Résumé : This paper deals with the coordinated control of rotor- and grid-side converters in wind turbines with doubly fed induction generators (DFIGs) to improve the low-voltage ride-through capability. The rotor-side converter control and additional equipment, called stator damping resistor, are used to limit the rotor inrush current and to reduce the oscillations and settling time of DFIG transient response during the voltage dip. Also, the grid-side converter is controlled to limit the dc-link overvoltage during the voltage drop. It is found that the dynamics of the grid-side converter and dc-link voltage exhibit nonminimum phase behavior, and thus there is an inherent limitation on the achievable dynamic response during the fault. Since the dc-link dynamics is nonlinear, the linear control scheme cannot properly limit the dc-link voltage under large voltage dips. Thus, a nonlinear control scheme applied to the grid-side converter is proposed, which stabilizes the internal dynamics and limits the dc-link voltage fluctuations during the fault. The proposed ride-through approaches limit the peak values of rotor current and dc-link voltage at the instants of occurring and clearing the fault. They also limit the oscillations of electromagnetic torque, and consequently, improve the DFIG voltage dip behavior. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552157&sortType%3Das [...]

Field and laboratory demonstration of a fiber-optic/RF partial discharges monitoring system for hydrogenerators applications / Rosolem, J. B. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 884 - 890 Titre : Field and laboratory demonstration of a fiber-optic/RF partial discharges monitoring system for hydrogenerators applications Type de document : texte imprimé Auteurs : Rosolem, J. B., Auteur ; Floridia, C., Auteur ; Sanz, J.P. M., Auteur Année de publication : 2011 Article en page(s) : pp. 884 - 890 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Fibre  optic  sensors;  hydroelectric  generators;  hydroelectric  power  stations;  optical  fibres;  partial  discharges;  power  system  measurement Résumé : In this paper, we present the results of a hybrid fiber-optic and RF-sensing technology for monitoring partial discharges on hydrogenerators, which can also be used for several other applications. The main advantages of the proposed system are passivity, flexibility, nonintrusive, inherently dielectric, and human and equipment risk-free. We describe the performance evaluation of the sensing system in laboratory and in field trial installed in a hydroelectric power station located in north of Brazil. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552156&sortType%3Das [...] [article] Field and laboratory demonstration of a fiber-optic/RF partial discharges monitoring system for hydrogenerators applications [texte imprimé] / Rosolem, J. B., Auteur ; Floridia, C., Auteur ; Sanz, J.P. M., Auteur . - 2011 . - pp. 884 - 890. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 884 - 890 Mots-clés : Fibre  optic  sensors;  hydroelectric  generators;  hydroelectric  power  stations;  optical  fibres;  partial  discharges;  power  system  measurement Résumé : In this paper, we present the results of a hybrid fiber-optic and RF-sensing technology for monitoring partial discharges on hydrogenerators, which can also be used for several other applications. The main advantages of the proposed system are passivity, flexibility, nonintrusive, inherently dielectric, and human and equipment risk-free. We describe the performance evaluation of the sensing system in laboratory and in field trial installed in a hydroelectric power station located in north of Brazil. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552156&sortType%3Das [...]

A speed-adaptive reduced-order observer for sensorless vector control of doubly fed induction generator-based variable-speed wind turbines / Sheng Yang in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 891 - 900 Titre : A speed-adaptive reduced-order observer for sensorless vector control of doubly fed induction generator-based variable-speed wind turbines Type de document : texte imprimé Auteurs : Sheng Yang, Auteur ; Ajjarapu, V., Auteur Année de publication : 2011 Article en page(s) : pp. 891 - 900 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Angular  velocity  control;  asynchronous  generators;  machine  vector  control;  observers;  sensitivity  analysis;  sensorless  machine  control;  wind  turbines Résumé : In this paper, a speed-adaptive reduced-order observer for sensorless vector control of doubly fed induction generators (DFIGs) is proposed. The observer is a simulation of the rotor current dynamic model with feedback of the estimation error and a speed-adaptation loop. Feedback and adaptation gains are designed based on the closed-loop observer model. A parameter sensitivity analysis reveals that this observer is robust against machine parameter variations in the normal operating regions. Simulation results demonstrate desired steady-state and dynamic performance of this sensorless control approach for DFIG-based variable-speed wind turbines. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552148&sortType%3Das [...] [article] A speed-adaptive reduced-order observer for sensorless vector control of doubly fed induction generator-based variable-speed wind turbines [texte imprimé] / Sheng Yang, Auteur ; Ajjarapu, V., Auteur . - 2011 . - pp. 891 - 900. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 891 - 900 Mots-clés : Angular  velocity  control;  asynchronous  generators;  machine  vector  control;  observers;  sensitivity  analysis;  sensorless  machine  control;  wind  turbines Résumé : In this paper, a speed-adaptive reduced-order observer for sensorless vector control of doubly fed induction generators (DFIGs) is proposed. The observer is a simulation of the rotor current dynamic model with feedback of the estimation error and a speed-adaptation loop. Feedback and adaptation gains are designed based on the closed-loop observer model. A parameter sensitivity analysis reveals that this observer is robust against machine parameter variations in the normal operating regions. Simulation results demonstrate desired steady-state and dynamic performance of this sensorless control approach for DFIG-based variable-speed wind turbines. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5552148&sortType%3Das [...]

Benefits of power electronic interfaces for distributed energy systems / Kroposki, B. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 901 - 908 Titre : Benefits of power electronic interfaces for distributed energy systems Type de document : texte imprimé Auteurs : Kroposki, B., Auteur ; Pink, C., Auteur ; DeBlasio, R., Auteur Année de publication : 2011 Article en page(s) : pp. 901 - 908 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Distributed  power  generation;  power  electronics:  power  generation  reliability;  power  supply  quality;  power  system  interconnection Résumé : With the increasing use of distributed energy (DE) systems in industry and its technological advancement, it is becoming more important to understand the integration of these systems with the electric power systems. New markets and benefits for DE applications include the ability to provide ancillary services, improve energy efficiency, enhance power system reliability, and allow customer choice. Advanced power electronic (PE) interfaces will allow DE systems to provide increased functionality through improved power quality and voltage/volt-ampere reactive (VAR) support, increase electrical system compatibility by reducing the fault contributions, and flexibility in operations with various other DE sources, while reducing overall interconnection costs. This paper will examine the system integration issues associated with DE systems and show the benefits of using PE interfaces for such applications. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5535071&sortType%3Das [...] [article] Benefits of power electronic interfaces for distributed energy systems [texte imprimé] / Kroposki, B., Auteur ; Pink, C., Auteur ; DeBlasio, R., Auteur . - 2011 . - pp. 901 - 908. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 901 - 908 Mots-clés : Distributed  power  generation;  power  electronics:  power  generation  reliability;  power  supply  quality;  power  system  interconnection Résumé : With the increasing use of distributed energy (DE) systems in industry and its technological advancement, it is becoming more important to understand the integration of these systems with the electric power systems. New markets and benefits for DE applications include the ability to provide ancillary services, improve energy efficiency, enhance power system reliability, and allow customer choice. Advanced power electronic (PE) interfaces will allow DE systems to provide increased functionality through improved power quality and voltage/volt-ampere reactive (VAR) support, increase electrical system compatibility by reducing the fault contributions, and flexibility in operations with various other DE sources, while reducing overall interconnection costs. This paper will examine the system integration issues associated with DE systems and show the benefits of using PE interfaces for such applications. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5535071&sortType%3Das [...]

Analysis of differential flatness-based control for a fuel cell hybrid power source / Thounthong, P. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 909 - 920 Titre : Analysis of differential flatness-based control for a fuel cell hybrid power source Type de document : texte imprimé Auteurs : Thounthong, P., Auteur ; Pierfederici, S., Auteur ; Davat, B., Auteur Année de publication : 2011 Article en page(s) : pp. 909 - 920 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Distributed  power  generation;  energy  management  systems;  fuel  cell  power  plants;  nonlinear  control  systems;  power  convertors;  power  generation  control;  supercapacitors Résumé : This paper presents an innovative control law for distributed dc generation supplied by a fuel cell (FC) (main source) and supercapacitor (auxiliary source). This kind of system is a multiconverter structure and exhibits nonlinear behavior. The operation of a multiconverter structure can lead to interactions between the controls of the converters if they are designed separately. Typically, interactions between converters are studied using impedance criteria to investigate the stability of cascaded systems. In this paper, a nonlinear control algorithm based on the flatness properties of the system is proposed. Flatness provides a convenient framework for meeting a number of performance specifications for the hybrid power source. Using the flatness property, we propose simple solutions to hybrid energy management and stabilization problems. The design controller parameters are autonomous of the operating point; moreover, interactions between converters are taken into account by the controllers, and high dynamics in disturbance rejection is achieved. To validate the proposed method, a hardware system is realized with analog circuits, and digital estimation is accomplished with a dSPACE controller. Experimental results with small-scale devices (a polymer electrolyte membrane FC of 1200 W, 46 A and a supercapacitor module of 100 F, 500 A, and 32 V) in a laboratory corroborate the excellent control scheme during a motor-drive cycle. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5546934&sortType%3Das [...] [article] Analysis of differential flatness-based control for a fuel cell hybrid power source [texte imprimé] / Thounthong, P., Auteur ; Pierfederici, S., Auteur ; Davat, B., Auteur . - 2011 . - pp. 909 - 920. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 909 - 920 Mots-clés : Distributed  power  generation;  energy  management  systems;  fuel  cell  power  plants;  nonlinear  control  systems;  power  convertors;  power  generation  control;  supercapacitors Résumé : This paper presents an innovative control law for distributed dc generation supplied by a fuel cell (FC) (main source) and supercapacitor (auxiliary source). This kind of system is a multiconverter structure and exhibits nonlinear behavior. The operation of a multiconverter structure can lead to interactions between the controls of the converters if they are designed separately. Typically, interactions between converters are studied using impedance criteria to investigate the stability of cascaded systems. In this paper, a nonlinear control algorithm based on the flatness properties of the system is proposed. Flatness provides a convenient framework for meeting a number of performance specifications for the hybrid power source. Using the flatness property, we propose simple solutions to hybrid energy management and stabilization problems. The design controller parameters are autonomous of the operating point; moreover, interactions between converters are taken into account by the controllers, and high dynamics in disturbance rejection is achieved. To validate the proposed method, a hardware system is realized with analog circuits, and digital estimation is accomplished with a dSPACE controller. Experimental results with small-scale devices (a polymer electrolyte membrane FC of 1200 W, 46 A and a supercapacitor module of 100 F, 500 A, and 32 V) in a laboratory corroborate the excellent control scheme during a motor-drive cycle. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5546934&sortType%3Das [...]

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