Dépouillements

Accurate prediction of magnetic field and magnetic forces in permanent magnet motors using an analytical solution / Liu, Z. J. in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 717 - 726 Titre : Accurate prediction of magnetic field and magnetic forces in permanent magnet motors using an analytical solution Type de document : texte imprimé Auteurs : Liu, Z. J., Auteur ; Li, J. T., Auteur Année de publication : 2008 Article en page(s) : pp. 717 - 726 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Brushless  machines;  finite  element  analysis;  machine  theory;  magnetic  coresmagnetic  fields;  magnetic  forces;  optimisation;  permanent  magnet  motors Résumé : This paper presents an analytical model suitable for analyzing permanent magnet motors with slotted stator core. By including the effect of the interaction between the pole transitions and slot openings, the model is able to predict the airgap field and magnetic forces with high accuracy, which cannot be achieved using the previously available analytical methods. The results of electromagnetic forces, i.e., the cogging torque and unbalanced magnetic pull, computed analytically agree well with numerical simulations using the finite-element method. The model is used to analyze the magnetic forces developed in permanent magnet brushless motors when the design parameters vary in wide ranges. The model is useful in design and optimization of permanent magnet motors. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4558414&sortType%3Das [...] [article] Accurate prediction of magnetic field and magnetic forces in permanent magnet motors using an analytical solution [texte imprimé] / Liu, Z. J., Auteur ; Li, J. T., Auteur . - 2008 . - pp. 717 - 726. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 717 - 726 Mots-clés : Brushless  machines;  finite  element  analysis;  machine  theory;  magnetic  coresmagnetic  fields;  magnetic  forces;  optimisation;  permanent  magnet  motors Résumé : This paper presents an analytical model suitable for analyzing permanent magnet motors with slotted stator core. By including the effect of the interaction between the pole transitions and slot openings, the model is able to predict the airgap field and magnetic forces with high accuracy, which cannot be achieved using the previously available analytical methods. The results of electromagnetic forces, i.e., the cogging torque and unbalanced magnetic pull, computed analytically agree well with numerical simulations using the finite-element method. The model is used to analyze the magnetic forces developed in permanent magnet brushless motors when the design parameters vary in wide ranges. The model is useful in design and optimization of permanent magnet motors. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4558414&sortType%3Das [...]

Analysis and optimization of back EMF waveform of a flux-switching permanent magnet motor / Wei Hua in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 727 - 733 Titre : Analysis and optimization of back EMF waveform of a flux-switching permanent magnet motor Type de document : texte imprimé Auteurs : Wei Hua, Auteur ; Ming Cheng, Auteur ; Zhu, Z.Q., Auteur Année de publication : 2008 Article en page(s) : pp. 727 - 733 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Finite  element  analysis;  magnetic  flux;  optimisation;  permanent  magnet  motors Résumé : Flux-switching permanent magnet (FSPM) motors have a doubly salient structure, the magnets being housed in the stator and the stator winding comprising concentrated coils. They have attracted considerable interest due to their essentially sinusoidal phase back electromotive force (EMF) waveform. However, to date, the inherent nature of this desirable feature has not been investigated in detail. Thus, a typical three-phase FSPM motor with 12 stator teeth and ten rotor poles is considered. It is found that, since there is a significant difference in the magnetic flux paths associated with the coils of each phase, this results in harmonics in the coil back EMF waveforms being cancelled, resulting in essentially sinusoidal phase back EMF waveforms. In addition, the influence of the rotor pole-arc on the phase back EMF waveform is evaluated by finite-element analysis, and an optimal pole-arc for minimum harmonic content in the back EMF is obtained and verified experimentally. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4483784&sortType%3Das [...] [article] Analysis and optimization of back EMF waveform of a flux-switching permanent magnet motor [texte imprimé] / Wei Hua, Auteur ; Ming Cheng, Auteur ; Zhu, Z.Q., Auteur . - 2008 . - pp. 727 - 733. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 727 - 733 Mots-clés : Finite  element  analysis;  magnetic  flux;  optimisation;  permanent  magnet  motors Résumé : Flux-switching permanent magnet (FSPM) motors have a doubly salient structure, the magnets being housed in the stator and the stator winding comprising concentrated coils. They have attracted considerable interest due to their essentially sinusoidal phase back electromotive force (EMF) waveform. However, to date, the inherent nature of this desirable feature has not been investigated in detail. Thus, a typical three-phase FSPM motor with 12 stator teeth and ten rotor poles is considered. It is found that, since there is a significant difference in the magnetic flux paths associated with the coils of each phase, this results in harmonics in the coil back EMF waveforms being cancelled, resulting in essentially sinusoidal phase back EMF waveforms. In addition, the influence of the rotor pole-arc on the phase back EMF waveform is evaluated by finite-element analysis, and an optimal pole-arc for minimum harmonic content in the back EMF is obtained and verified experimentally. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4483784&sortType%3Das [...]

Fault detection and protection of induction motors using sensors / Bayindir, R. in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 734 - 741 Titre : Fault detection and protection of induction motors using sensors Type de document : texte imprimé Auteurs : Bayindir, R., Auteur ; Sefa, I., Auteur ; Colak, I., Auteur Année de publication : 2008 Article en page(s) : pp. 734 - 741 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Analogue-digital  conversion;  electric  sensing  devices;  fault  diagnosis;  induction  motor  protection;  machine  control;  programmable  logic  devices Résumé : Protection of an induction motor (IM) against possible problems, such as overvoltage, overcurrent, overload, overtemperature, and undervoltage, occurring in the course of its operation is very important, because it is used intensively in industry as an actuator. IMs can be protected using some components, such as timers, contactors, voltage, and current relays. This method is known as the classical method that is very basic and involves mechanical dynamic parts. Computer and programmable integrated circuit (PIC) based protection methods have eliminated most of the mechanical components. However, the computer-based protection method requires an analog-to-digital conversion (ADC) card, and the PIC-based protection method does not visualize the electrical parameters measured. In this study, for IMs, a new protection method based on a programmable logic controller (PLC) has been introduced. In this method, all contactors, timers, relays, and the conversion card are eliminated. Moreover, the voltages, the currents, the speed, and the temperature values of the motor, and the problems occurred in the system, are monitored and warning messages are shown on the computer screen. Experimental results show that the PLC-based protection method developed costs less, provides higher accuracy as well as safe and visual environment compared with the classical, the computer, and the PIC-based protection systems. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4603060&sortType%3Das [...] [article] Fault detection and protection of induction motors using sensors [texte imprimé] / Bayindir, R., Auteur ; Sefa, I., Auteur ; Colak, I., Auteur . - 2008 . - pp. 734 - 741. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 734 - 741 Mots-clés : Analogue-digital  conversion;  electric  sensing  devices;  fault  diagnosis;  induction  motor  protection;  machine  control;  programmable  logic  devices Résumé : Protection of an induction motor (IM) against possible problems, such as overvoltage, overcurrent, overload, overtemperature, and undervoltage, occurring in the course of its operation is very important, because it is used intensively in industry as an actuator. IMs can be protected using some components, such as timers, contactors, voltage, and current relays. This method is known as the classical method that is very basic and involves mechanical dynamic parts. Computer and programmable integrated circuit (PIC) based protection methods have eliminated most of the mechanical components. However, the computer-based protection method requires an analog-to-digital conversion (ADC) card, and the PIC-based protection method does not visualize the electrical parameters measured. In this study, for IMs, a new protection method based on a programmable logic controller (PLC) has been introduced. In this method, all contactors, timers, relays, and the conversion card are eliminated. Moreover, the voltages, the currents, the speed, and the temperature values of the motor, and the problems occurred in the system, are monitored and warning messages are shown on the computer screen. Experimental results show that the PLC-based protection method developed costs less, provides higher accuracy as well as safe and visual environment compared with the classical, the computer, and the PIC-based protection systems. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4603060&sortType%3Das [...]

Frequency-domain model for calculation of voltage distribution through random wound coils and its interaction with stray capacitanc / Martinez-Tarifa, J.M. in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 742 - 751 Titre : Frequency-domain model for calculation of voltage distribution through random wound coils and its interaction with stray capacitanc Type de document : texte imprimé Auteurs : Martinez-Tarifa, J.M., Auteur ; Amaras-Duarte, H., Auteur ; Sanz-Feito, J., Auteur Année de publication : 2008 Article en page(s) : pp. 742 - 751 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : PWM  invertors;  coils;  frequency-domain  analysis;  induction  motor  drives;  voltage  distribution Résumé : Modern pulsewidth-modulation (PWM) low-voltage drives are recognized as one of the most demanding applications for a motor. Pulses facing motor terminals are responsible for turn-to-turn high electrical stresses that lead to unexpected failures in stator windings. In this paper, an accurate new model for frequency-domain voltage distribution calculation through random wound coils is presented. In addition to checking its applicability for varnished coils, the role of stray capacitances in turn-by-turn voltage propagation is analyzed as well. Model accuracy is proved using experimental data in an experimental test cell. Finally, the same model is applied successfully to real random wound coils inserted in a motor stator core, and the ability to change turn-to-turn electrical stresses by means of changes in stray capacitances values will be quantified. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4558415&sortType%3Das [...] [article] Frequency-domain model for calculation of voltage distribution through random wound coils and its interaction with stray capacitanc [texte imprimé] / Martinez-Tarifa, J.M., Auteur ; Amaras-Duarte, H., Auteur ; Sanz-Feito, J., Auteur . - 2008 . - pp. 742 - 751. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 742 - 751 Mots-clés : PWM  invertors;  coils;  frequency-domain  analysis;  induction  motor  drives;  voltage  distribution Résumé : Modern pulsewidth-modulation (PWM) low-voltage drives are recognized as one of the most demanding applications for a motor. Pulses facing motor terminals are responsible for turn-to-turn high electrical stresses that lead to unexpected failures in stator windings. In this paper, an accurate new model for frequency-domain voltage distribution calculation through random wound coils is presented. In addition to checking its applicability for varnished coils, the role of stray capacitances in turn-by-turn voltage propagation is analyzed as well. Model accuracy is proved using experimental data in an experimental test cell. Finally, the same model is applied successfully to real random wound coils inserted in a motor stator core, and the ability to change turn-to-turn electrical stresses by means of changes in stray capacitances values will be quantified. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4558415&sortType%3Das [...]

Dynamic performance of brushless DC motors with unbalanced hall sensors / Samoylenko, N. in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 752 - 763 Titre : Dynamic performance of brushless DC motors with unbalanced hall sensors Type de document : texte imprimé Auteurs : Samoylenko, N., Auteur ; Qiang, Han, Auteur ; Jatskevich, J., Auteur Année de publication : 2008 Article en page(s) : pp. 752 - 763 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Hall  effect  transducers;  brushless  DC  motors;  torque Résumé : Brushless dc (BLDC) motors controlled by Hall-effect sensors are widely used in various applications and have been extensively researched in the literature, mainly under the assumption that the Hall sensors are ideally placed 120 electrical degrees apart. However, this assumption is not always valid; in fact, sensor placement may be significantly inaccurate, especially in medium- and low-precision BLDC machines. This paper shows that misplaced Hall sensors lead to unbalanced operation of the inverter and motor phases, which increases the low-frequency harmonics in torque ripple and degrades the overall drive performance. The paper also presents several average-filtering techniques that can be applied to the original Hall-sensor signals to mitigate the effect of unbalanced placement during steady-state and transient operations. The proposed methodology is demonstrated by modeling and hardware, and is shown to achieve dynamic performance similar to that of a BLDC motor with accurately positioned Hall sensors. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4537158&sortType%3Das [...] [article] Dynamic performance of brushless DC motors with unbalanced hall sensors [texte imprimé] / Samoylenko, N., Auteur ; Qiang, Han, Auteur ; Jatskevich, J., Auteur . - 2008 . - pp. 752 - 763. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 752 - 763 Mots-clés : Hall  effect  transducers;  brushless  DC  motors;  torque Résumé : Brushless dc (BLDC) motors controlled by Hall-effect sensors are widely used in various applications and have been extensively researched in the literature, mainly under the assumption that the Hall sensors are ideally placed 120 electrical degrees apart. However, this assumption is not always valid; in fact, sensor placement may be significantly inaccurate, especially in medium- and low-precision BLDC machines. This paper shows that misplaced Hall sensors lead to unbalanced operation of the inverter and motor phases, which increases the low-frequency harmonics in torque ripple and degrades the overall drive performance. The paper also presents several average-filtering techniques that can be applied to the original Hall-sensor signals to mitigate the effect of unbalanced placement during steady-state and transient operations. The proposed methodology is demonstrated by modeling and hardware, and is shown to achieve dynamic performance similar to that of a BLDC motor with accurately positioned Hall sensors. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4537158&sortType%3Das [...]

Power quality improvement in conventional electronic load controller for an isolated power generation / Singh, B. in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 764 - 773 Titre : Power quality improvement in conventional electronic load controller for an isolated power generation Type de document : texte imprimé Auteurs : Singh, B., Auteur ; Kasal, G. K., Auteur ; Gairola, S., Auteur Année de publication : 2008 Article en page(s) : pp. 764 - 773 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Asynchronous  generators;  hydroelectric  power;  power  generation  control;  power  station  load;  power  system  management;  rectifiers Résumé : This paper deals with the power quality improvement in a conventional electronic load controller (ELC) used for isolated pico-hydropower generation based on an asynchronous generator (AG). The conventional ELC is based on a six-pulse uncontrolled diode bridge rectifier with a chopper and an auxiliary load. It causes harmonic currents injection resulting distortion in the current and terminal voltage of the generator. The proposed ELC employs a 24-pulse rectifier with 14 diodes and a chopper. A polygon wound autotransformer with reduced kilovolts ampere rating for 24-pulse ac-dc converter is designed and developed for harmonic current reduction to meet the power quality requirements as prescribed by IEEE standard-519. The comparative study of two topologies, conventional ELC (six-pulse bridge-rectifier-based ELC) and proposed ELC (24-pulse bridge-rectifier-based ELC) is carried out in MATLAB using SIMULINK and Power System Blockset toolboxes. Experimental validation is carried out for both ELCs for regulating the voltage and frequency of an isolated AG driven by uncontrolled pico-hydroturbine. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4554250&sortType%3Das [...] [article] Power quality improvement in conventional electronic load controller for an isolated power generation [texte imprimé] / Singh, B., Auteur ; Kasal, G. K., Auteur ; Gairola, S., Auteur . - 2008 . - pp. 764 - 773. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 764 - 773 Mots-clés : Asynchronous  generators;  hydroelectric  power;  power  generation  control;  power  station  load;  power  system  management;  rectifiers Résumé : This paper deals with the power quality improvement in a conventional electronic load controller (ELC) used for isolated pico-hydropower generation based on an asynchronous generator (AG). The conventional ELC is based on a six-pulse uncontrolled diode bridge rectifier with a chopper and an auxiliary load. It causes harmonic currents injection resulting distortion in the current and terminal voltage of the generator. The proposed ELC employs a 24-pulse rectifier with 14 diodes and a chopper. A polygon wound autotransformer with reduced kilovolts ampere rating for 24-pulse ac-dc converter is designed and developed for harmonic current reduction to meet the power quality requirements as prescribed by IEEE standard-519. The comparative study of two topologies, conventional ELC (six-pulse bridge-rectifier-based ELC) and proposed ELC (24-pulse bridge-rectifier-based ELC) is carried out in MATLAB using SIMULINK and Power System Blockset toolboxes. Experimental validation is carried out for both ELCs for regulating the voltage and frequency of an isolated AG driven by uncontrolled pico-hydroturbine. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4554250&sortType%3Das [...]

Analysis of critical-speed increase of induction machines via winding reconfiguration with solid-state switches / Fuchs, E. F. in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 774 - 780 Titre : Analysis of critical-speed increase of induction machines via winding reconfiguration with solid-state switches Type de document : texte imprimé Auteurs : Fuchs, E. F., Auteur ; Schraud, J., Auteur ; Fuchs, F. S., Auteur Année de publication : 2008 Article en page(s) : pp. 774 - 780 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Angular  velocity  control;  asynchronous  machines;  machine  windings;  switches Résumé : Commonly used speed-control concepts permit speed ranges up to two-three times the base speed via voltage to frequency (V/f), that is, field-weakening control. This paper teaches the extension of the speed-control range up to nine times the base speed through online reconfiguration of the motor windings via electronic switches. The switchover of the windings, either from a winding with p1 poles to p2 poles, or from series to parallel connection of the number of turns per phase-so-called (V/Nldrf) control-lasts less than a 60-Hz cycle. Such fast switchover causes small transients only, and therefore, this concept is applicable to most variable-speed drives. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4544495&sortType%3Das [...] [article] Analysis of critical-speed increase of induction machines via winding reconfiguration with solid-state switches [texte imprimé] / Fuchs, E. F., Auteur ; Schraud, J., Auteur ; Fuchs, F. S., Auteur . - 2008 . - pp. 774 - 780. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 774 - 780 Mots-clés : Angular  velocity  control;  asynchronous  machines;  machine  windings;  switches Résumé : Commonly used speed-control concepts permit speed ranges up to two-three times the base speed via voltage to frequency (V/f), that is, field-weakening control. This paper teaches the extension of the speed-control range up to nine times the base speed through online reconfiguration of the motor windings via electronic switches. The switchover of the windings, either from a winding with p1 poles to p2 poles, or from series to parallel connection of the number of turns per phase-so-called (V/Nldrf) control-lasts less than a 60-Hz cycle. Such fast switchover causes small transients only, and therefore, this concept is applicable to most variable-speed drives. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4544495&sortType%3Das [...]

Simple power control for sensorless induction motor drives fed by a matrix converter / Kyo-Beum Lee in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 781 - 788 Titre : Simple power control for sensorless induction motor drives fed by a matrix converter Type de document : texte imprimé Auteurs : Kyo-Beum Lee, Auteur ; Blaabjerg, F., Auteur Année de publication : 2008 Article en page(s) : pp. 781 - 788 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Induction  motor  drives;  machine  control;  matrix  convertors;  power  control;  switching  convertors Résumé : This paper presents a new and simple method for sensorless control of matrix converter drives using a power flowing to the motor. The proposed control algorithm is based on controlling the instantaneous real and imaginary powers into the induction motor. To improve low-speed sensorless performance, the nonlinearities of a matrix converter drive such as commutation delays, turn-ON and turn-OFF times of switching devices, and on-state switching device voltage drop are modeled using a PQ power transformation and compensated using a reference power control scheme. The proposed sensorless control method is applied for the induction motor drive using a 3 kW matrix converter system. Experimental results are shown to illustrate the feasibility of the proposed strategy. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4603065&sortType%3Das [...] [article] Simple power control for sensorless induction motor drives fed by a matrix converter [texte imprimé] / Kyo-Beum Lee, Auteur ; Blaabjerg, F., Auteur . - 2008 . - pp. 781 - 788. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 781 - 788 Mots-clés : Induction  motor  drives;  machine  control;  matrix  convertors;  power  control;  switching  convertors Résumé : This paper presents a new and simple method for sensorless control of matrix converter drives using a power flowing to the motor. The proposed control algorithm is based on controlling the instantaneous real and imaginary powers into the induction motor. To improve low-speed sensorless performance, the nonlinearities of a matrix converter drive such as commutation delays, turn-ON and turn-OFF times of switching devices, and on-state switching device voltage drop are modeled using a PQ power transformation and compensated using a reference power control scheme. The proposed sensorless control method is applied for the induction motor drive using a 3 kW matrix converter system. Experimental results are shown to illustrate the feasibility of the proposed strategy. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4603065&sortType%3Das [...]

Transient electromechanical modeling for short secondary linear induction machines / Hall, D. in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 789 - 795 Titre : Transient electromechanical modeling for short secondary linear induction machines Type de document : texte imprimé Auteurs : Hall, D., Auteur ; Kapinski, J., Auteur ; Krefta, M., Auteur Année de publication : 2008 Article en page(s) : pp. 789 - 795 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Electromechanical  effects;  linear  induction  motors;  machine  control Résumé : Linear induction motors are under development for a variety of demanding applications including aircraft launchers and magnetically levitating trains. These applications require machines that can produce large forces, operate at high speeds, and can be controlled precisely to meet performance requirements. The design and implementation of these systems require fast and accurate techniques for performing system simulation and control system design. We present techniques for modeling and controlling linear induction machines based on a direct and quadrature (DQ) representation of the system dynamics. Simulation results using the DQ representation of the machine dynamics are presented and compared to test data from a Subscale Integration Test Bed developed for the U.S. Navy's Electromagnetic Aircraft Launch System program. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4558413&sortType%3Das [...] [article] Transient electromechanical modeling for short secondary linear induction machines [texte imprimé] / Hall, D., Auteur ; Kapinski, J., Auteur ; Krefta, M., Auteur . - 2008 . - pp. 789 - 795. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 789 - 795 Mots-clés : Electromechanical  effects;  linear  induction  motors;  machine  control Résumé : Linear induction motors are under development for a variety of demanding applications including aircraft launchers and magnetically levitating trains. These applications require machines that can produce large forces, operate at high speeds, and can be controlled precisely to meet performance requirements. The design and implementation of these systems require fast and accurate techniques for performing system simulation and control system design. We present techniques for modeling and controlling linear induction machines based on a direct and quadrature (DQ) representation of the system dynamics. Simulation results using the DQ representation of the machine dynamics are presented and compared to test data from a Subscale Integration Test Bed developed for the U.S. Navy's Electromagnetic Aircraft Launch System program. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4558413&sortType%3Das [...]

Induction motor equivalent circuit including the stray load losses in the machine power balance / Boglietti, A. in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 796 - 803 Titre : Induction motor equivalent circuit including the stray load losses in the machine power balance Type de document : texte imprimé Auteurs : Boglietti, A., Auteur ; Cavagnino, A., Auteur ; Ferraris, L., Auteur Année de publication : 2008 Article en page(s) : pp. 796 - 803 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Electric  impedance;  equivalent  circuits;  harmonics;  losses;  machine  theory;  rotors;  squirrel  cage  motors;  stators Résumé : In this paper, the stray load losses due to the air gap spatial harmonics effects on the rotor squirrel cage are considered and a simplified induction motor equivalent circuit able to include them in the machine power balance is reported. In the proposed model, an additional resistance appears in series with the stator impedance. This additional parameter has been defined on the basis of power balance considerations applied to the induction motor classical theory. The complete theoretical analysis together with the guidelines to measure the equivalent circuit parameters are reported in detail. Finally, the proposed approach has been experimentally verified using five total enclosed fan cooled induction motors. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4537512&sortType%3Das [...] [article] Induction motor equivalent circuit including the stray load losses in the machine power balance [texte imprimé] / Boglietti, A., Auteur ; Cavagnino, A., Auteur ; Ferraris, L., Auteur . - 2008 . - pp. 796 - 803. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 796 - 803 Mots-clés : Electric  impedance;  equivalent  circuits;  harmonics;  losses;  machine  theory;  rotors;  squirrel  cage  motors;  stators Résumé : In this paper, the stray load losses due to the air gap spatial harmonics effects on the rotor squirrel cage are considered and a simplified induction motor equivalent circuit able to include them in the machine power balance is reported. In the proposed model, an additional resistance appears in series with the stator impedance. This additional parameter has been defined on the basis of power balance considerations applied to the induction motor classical theory. The complete theoretical analysis together with the guidelines to measure the equivalent circuit parameters are reported in detail. Finally, the proposed approach has been experimentally verified using five total enclosed fan cooled induction motors. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4537512&sortType%3Das [...]

On-load motor parameter identification using univariate dynamic encoding algorithm for searches / Jong Kwon Kim in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 804 - 813 Titre : On-load motor parameter identification using univariate dynamic encoding algorithm for searches Type de document : texte imprimé Auteurs : Jong Kwon Kim, Auteur ; Taegyu Kim, Auteur ; Youngsu Park, Auteur Année de publication : 2008 Article en page(s) : pp. 804 - 813 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Encoding;  induction  motors;  machine  theory;  optimisation Résumé : Parameter identification of an induction motor has long been studied either for vector control or fault diagnosis. This paper addresses parameter identification of an induction motor under on-load operation. For estimating electrical and mechanical parameters in the motor model from the on-load data, unmeasured initial states and load torque profile have to be also estimated for state evaluation. Since gradient of cost function for the auxiliary variables are hard to be derived, direct optimization methods that rely on computational capability should be employed. In this paper, the univariate dynamic encoding algorithm for searches (uDEAS), recently developed by the authors, is applied to the identification of whole unknown variables with measured voltage, current, and velocity data. Profiles of motor parameters estimated with uDEAS are reasonable, and estimation time is 2 s on average, which is quite fast as compared with other direct optimization methods. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4560057&sortType%3Das [...] [article] On-load motor parameter identification using univariate dynamic encoding algorithm for searches [texte imprimé] / Jong Kwon Kim, Auteur ; Taegyu Kim, Auteur ; Youngsu Park, Auteur . - 2008 . - pp. 804 - 813. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 804 - 813 Mots-clés : Encoding;  induction  motors;  machine  theory;  optimisation Résumé : Parameter identification of an induction motor has long been studied either for vector control or fault diagnosis. This paper addresses parameter identification of an induction motor under on-load operation. For estimating electrical and mechanical parameters in the motor model from the on-load data, unmeasured initial states and load torque profile have to be also estimated for state evaluation. Since gradient of cost function for the auxiliary variables are hard to be derived, direct optimization methods that rely on computational capability should be employed. In this paper, the univariate dynamic encoding algorithm for searches (uDEAS), recently developed by the authors, is applied to the identification of whole unknown variables with measured voltage, current, and velocity data. Profiles of motor parameters estimated with uDEAS are reasonable, and estimation time is 2 s on average, which is quite fast as compared with other direct optimization methods. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4560057&sortType%3Das [...]

Saturation modeling and stability analysis of synchronous reluctance generator / Guha, S. in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 814 - 823 Titre : Saturation modeling and stability analysis of synchronous reluctance generator Type de document : texte imprimé Auteurs : Guha, S., Auteur ; Kar, N. C., Auteur Année de publication : 2008 Article en page(s) : pp. 814 - 823 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Earthing;  power  factor;  reactive  power;  reluctance  generators Résumé : A new method of representing magnetic saturation in synchronous reluctance generator has been proposed in this paper. A linearized model of synchronous reluctance generator has been developed applying the proposed saturation model to perform the steady-state stability analysis. The effect of - and -axis saturation on the steady-state stability of a synchronous reluctance generator has been investigated using the proposed linearized machine model. Effects of different loading conditions such as active power, reactive power, and power factor on the steady-state stability have also been looked into. Moreover, the effect of - and -axis saturation on the transient stability analysis has been investigated in the case of a three-phase symmetrical ground fault at the machine terminals. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4554248&sortType%3Das [...] [article] Saturation modeling and stability analysis of synchronous reluctance generator [texte imprimé] / Guha, S., Auteur ; Kar, N. C., Auteur . - 2008 . - pp. 814 - 823. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 814 - 823 Mots-clés : Earthing;  power  factor;  reactive  power;  reluctance  generators Résumé : A new method of representing magnetic saturation in synchronous reluctance generator has been proposed in this paper. A linearized model of synchronous reluctance generator has been developed applying the proposed saturation model to perform the steady-state stability analysis. The effect of - and -axis saturation on the steady-state stability of a synchronous reluctance generator has been investigated using the proposed linearized machine model. Effects of different loading conditions such as active power, reactive power, and power factor on the steady-state stability have also been looked into. Moreover, the effect of - and -axis saturation on the transient stability analysis has been investigated in the case of a three-phase symmetrical ground fault at the machine terminals. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4554248&sortType%3Das [...]

Linear models for optimization of infrastructure for CO2 capture and storage / Bakken, Bjorn H. in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 824 - 833 Titre : Linear models for optimization of infrastructure for CO2 capture and storage Type de document : texte imprimé Auteurs : Bakken, Bjorn H., Auteur ; von Streng Velken, I., Auteur Année de publication : 2008 Article en page(s) : pp. 824 - 833 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Air  pollution  control;  combined  cycle  power  stations;  gas  turbines;  investment;  power  generation  economics;  power  generation  planning;  power  markets;  power  station  control Résumé : This paper presents linear models of the most common components in the value chain for capture and storage. The optimal investment planning of new gas power plants traditionally includes the cost of fuel versus sales of electricity and heat from the plant. If a new power plant also causes additional investments in gas infrastructure, these should be included in the optimization. With the increasing focus on global emissions, yet another aspect is introduced in the form of technology and infrastructure for capture, transport, and storage of . To be able to include all these aspects in the planning of new power plants, linear models for capture and storage are formulated consistent with current models for gas, electricity, and heat infrastructures. This paper presents models for the following infrastructure: source, combined cycle gas turbine producing electricity, heat and exhaust, capture plant, pipeline, liquefaction plant, storage, ship transport, injection pump, and demand/market. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4510859&sortType%3Das [...] [article] Linear models for optimization of infrastructure for CO2 capture and storage [texte imprimé] / Bakken, Bjorn H., Auteur ; von Streng Velken, I., Auteur . - 2008 . - pp. 824 - 833. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 824 - 833 Mots-clés : Air  pollution  control;  combined  cycle  power  stations;  gas  turbines;  investment;  power  generation  economics;  power  generation  planning;  power  markets;  power  station  control Résumé : This paper presents linear models of the most common components in the value chain for capture and storage. The optimal investment planning of new gas power plants traditionally includes the cost of fuel versus sales of electricity and heat from the plant. If a new power plant also causes additional investments in gas infrastructure, these should be included in the optimization. With the increasing focus on global emissions, yet another aspect is introduced in the form of technology and infrastructure for capture, transport, and storage of . To be able to include all these aspects in the planning of new power plants, linear models for capture and storage are formulated consistent with current models for gas, electricity, and heat infrastructures. This paper presents models for the following infrastructure: source, combined cycle gas turbine producing electricity, heat and exhaust, capture plant, pipeline, liquefaction plant, storage, ship transport, injection pump, and demand/market. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4510859&sortType%3Das [...]

Basic modeling and simulation tool for analysis of hydraulic transients in hydroelectric power plants / Hongqing Fang in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 834 - 841 Titre : Basic modeling and simulation tool for analysis of hydraulic transients in hydroelectric power plants Type de document : texte imprimé Auteurs : Hongqing Fang, Auteur ; Long Chen, Auteur ; Dlakavu, N., Auteur Année de publication : 2008 Article en page(s) : pp. 834 - 841 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Hydraulic  turbines;  hydroelectric  power  stations;  mathematics  computing;  three-term  control;  velocity  control Résumé : In this paper, the simulation system of a typical hydroelectric power plant was developed in a MATLAB/Simulink-based software environment, which has a high water head and a long penstock with upstream and downstream surge tanks and is equipped with a Francis turbine. With MATLAB/Simulink, the models of the proposed simulation system are all modularized and visualized, and can be reused easily. No complex codes have been programmed and the proposed simulation system adapts varieties of hydroelectric power plants. The nonlinear characteristics of hydraulic turbine and then inelastic water hammer effect were considered to calculate and simulate hydraulic transients. Moreover, the influences of different parameters, such as hydraulic turbine speed governor proportional-integral-derivative (PID) gains, pressure water supply system, as well as surge tanks, were analyzed for the dynamic performance of hydraulic turbine regulating system. The digital simulations of a sudden full load rejection for an actual hydroelectric power plant in China were performed, and the results indicate that the proposed MATLAB/Simulink-based hydroelectric power plant simulation system is accurate and effective enough to represent and simulate hydroelectric power plant's nonlinear dynamics as well as to design hydraulic turbine speed control system. The proposed simulation system has also been proved to be useful for preliminary designs or assessments of hydropower projects. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4548418&sortType%3Das [...] [article] Basic modeling and simulation tool for analysis of hydraulic transients in hydroelectric power plants [texte imprimé] / Hongqing Fang, Auteur ; Long Chen, Auteur ; Dlakavu, N., Auteur . - 2008 . - pp. 834 - 841. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 834 - 841 Mots-clés : Hydraulic  turbines;  hydroelectric  power  stations;  mathematics  computing;  three-term  control;  velocity  control Résumé : In this paper, the simulation system of a typical hydroelectric power plant was developed in a MATLAB/Simulink-based software environment, which has a high water head and a long penstock with upstream and downstream surge tanks and is equipped with a Francis turbine. With MATLAB/Simulink, the models of the proposed simulation system are all modularized and visualized, and can be reused easily. No complex codes have been programmed and the proposed simulation system adapts varieties of hydroelectric power plants. The nonlinear characteristics of hydraulic turbine and then inelastic water hammer effect were considered to calculate and simulate hydraulic transients. Moreover, the influences of different parameters, such as hydraulic turbine speed governor proportional-integral-derivative (PID) gains, pressure water supply system, as well as surge tanks, were analyzed for the dynamic performance of hydraulic turbine regulating system. The digital simulations of a sudden full load rejection for an actual hydroelectric power plant in China were performed, and the results indicate that the proposed MATLAB/Simulink-based hydroelectric power plant simulation system is accurate and effective enough to represent and simulate hydroelectric power plant's nonlinear dynamics as well as to design hydraulic turbine speed control system. The proposed simulation system has also been proved to be useful for preliminary designs or assessments of hydropower projects. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4548418&sortType%3Das [...]

A compact electrical model for microscale fuel cells capable of predicting runtime and I – V polarization performance / Min Chen in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 842 - 850 Titre : A compact electrical model for microscale fuel cells capable of predicting runtime and I – V polarization performance Type de document : texte imprimé Auteurs : Min Chen, Auteur ; Rincon-Mora, G. A., Auteur Année de publication : 2008 Article en page(s) : pp. 842 - 850 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Direct  methanol  fuel  cells;  polarisation Résumé : The growing popularity and success of fuel cells (FCs) in aerospace, stationary power, and transportation applications is driving and challenging researchers to complement and in some cases altogether replace the batteries of portable systems in the hopes of increasing functional density, extending runtime, and decreasing size. Direct-methanol fuel cell (DMFC) batteries have now been built and conformed to low-cost technologies and chip-scale dimensions. Conventional FC models, however, fail to accurately capture the electrical nuances and runtime expectancies of these microscale devices, yet predicting that these electrical characteristics are even more critical when designing portable low-power electronics. A Cadence-compatible model of a DMFC battery is therefore developed to capture all pertinent dynamic and steady-state electrical performance parameters, including capacity and its dependence to current and temperature, open-circuit voltage, methanol-crossover current, polarization curve and its dependence to concentration, internal resistance, and time-dependent response under various loading conditions-the model can also be extended to other micro- and macroscale FC technologies. The simulation results of the proposed electrical model are validated and compared against the experimental performance of several DMFC prototypes, resulting in a runtime error of less than 10.8% and a voltage error under various current loads of less than 80 mV for up to 95% of its operational life. The root cause of the remaining errors and relevant temperature effects in the proposed model are also discussed. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4567145&sortType%3Das [...] [article] A compact electrical model for microscale fuel cells capable of predicting runtime and I – V polarization performance [texte imprimé] / Min Chen, Auteur ; Rincon-Mora, G. A., Auteur . - 2008 . - pp. 842 - 850. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 842 - 850 Mots-clés : Direct  methanol  fuel  cells;  polarisation Résumé : The growing popularity and success of fuel cells (FCs) in aerospace, stationary power, and transportation applications is driving and challenging researchers to complement and in some cases altogether replace the batteries of portable systems in the hopes of increasing functional density, extending runtime, and decreasing size. Direct-methanol fuel cell (DMFC) batteries have now been built and conformed to low-cost technologies and chip-scale dimensions. Conventional FC models, however, fail to accurately capture the electrical nuances and runtime expectancies of these microscale devices, yet predicting that these electrical characteristics are even more critical when designing portable low-power electronics. A Cadence-compatible model of a DMFC battery is therefore developed to capture all pertinent dynamic and steady-state electrical performance parameters, including capacity and its dependence to current and temperature, open-circuit voltage, methanol-crossover current, polarization curve and its dependence to concentration, internal resistance, and time-dependent response under various loading conditions-the model can also be extended to other micro- and macroscale FC technologies. The simulation results of the proposed electrical model are validated and compared against the experimental performance of several DMFC prototypes, resulting in a runtime error of less than 10.8% and a voltage error under various current loads of less than 80 mV for up to 95% of its operational life. The root cause of the remaining errors and relevant temperature effects in the proposed model are also discussed. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4567145&sortType%3Das [...]

Multiple input governor control for a diesel generating set / McGowan, D.J. in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 851 - 859 Titre : Multiple input governor control for a diesel generating set Type de document : texte imprimé Auteurs : McGowan, D.J., Auteur ; Morrow, D.John, Auteur ; Fox, B., Auteur Année de publication : 2008 Article en page(s) : pp. 851 - 859 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Diesel  engines;  fault  diagnosis;  fuzzy  control;  fuzzy  logic;  power  factor;  power  generation  control Résumé : The paper presents a multiple-input single-output fuzzy logic governor algorithm that can be used to improve the transient response of a diesel generating set, when supplying an islanded load. The proposed governor uses the traditional speed input in addition to voltage and power factor to modify the fueling requirements during various load disturbances. The use of fuzzy logic control allows the use of proportional-integral-derivative (PID) type structures that can provide variable gain strategies to account for nonlinearities in the system. Fuzzy logic also provides a means of processing other input information by linguistic reasoning and a logical control output to aid the governor action during transient disturbance. The test results were obtained using a 50 kVA naturally aspirated diesel generator testing facility. Both real and reactive load tests were conducted. The complex load test results demonstrate that, by using additional inputs to the governor algorithm, enhanced generator transient speed recovery response can be obtained. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4475789&sortType%3Das [...] [article] Multiple input governor control for a diesel generating set [texte imprimé] / McGowan, D.J., Auteur ; Morrow, D.John, Auteur ; Fox, B., Auteur . - 2008 . - pp. 851 - 859. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 851 - 859 Mots-clés : Diesel  engines;  fault  diagnosis;  fuzzy  control;  fuzzy  logic;  power  factor;  power  generation  control Résumé : The paper presents a multiple-input single-output fuzzy logic governor algorithm that can be used to improve the transient response of a diesel generating set, when supplying an islanded load. The proposed governor uses the traditional speed input in addition to voltage and power factor to modify the fueling requirements during various load disturbances. The use of fuzzy logic control allows the use of proportional-integral-derivative (PID) type structures that can provide variable gain strategies to account for nonlinearities in the system. Fuzzy logic also provides a means of processing other input information by linguistic reasoning and a logical control output to aid the governor action during transient disturbance. The test results were obtained using a 50 kVA naturally aspirated diesel generator testing facility. Both real and reactive load tests were conducted. The complex load test results demonstrate that, by using additional inputs to the governor algorithm, enhanced generator transient speed recovery response can be obtained. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4475789&sortType%3Das [...]

High-order sliding control for a wind energy conversion system based on a permanent magnet synchronous generator / Valenciaga, F. in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 860 - 867 Titre : High-order sliding control for a wind energy conversion system based on a permanent magnet synchronous generator Type de document : texte imprimé Auteurs : Valenciaga, F., Auteur ; Puleston, P.F., Auteur Année de publication : 2008 Article en page(s) : pp. 860 - 867 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Closed  loop  systems;  permanent  magnet  generators;  power  control;  power  generation  control;  synchronous  generators;  variable  structure  systems;  wind  power  plants Résumé : This paper presents the output power control of a wind energy conversion system (WECS) based on a permanent magnet synchronous generator (PMSG). It is assumed that the considered wind module integrates a stand-alone hybrid generation system, jointly with a battery bank, a variable ac load, and other generation subsystems. The operation strategy of the hybrid system determines two possible operation modes for the WECS, depending on the power requirements of the load and the wind availability. The paper deals with the design of a combined high-order sliding mode (HOSM) controller for the power control of the WECS on both operational modes. The main features of the obtained controller are its chattering-free behavior, its finite-time reaching phase, its simplicity, and its robustness with respect to external disturbances and unmodeled dynamics. The performance of the closed-loop system is assessed through representative computer simulations. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4560056&sortType%3Das [...] [article] High-order sliding control for a wind energy conversion system based on a permanent magnet synchronous generator [texte imprimé] / Valenciaga, F., Auteur ; Puleston, P.F., Auteur . - 2008 . - pp. 860 - 867. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 860 - 867 Mots-clés : Closed  loop  systems;  permanent  magnet  generators;  power  control;  power  generation  control;  synchronous  generators;  variable  structure  systems;  wind  power  plants Résumé : This paper presents the output power control of a wind energy conversion system (WECS) based on a permanent magnet synchronous generator (PMSG). It is assumed that the considered wind module integrates a stand-alone hybrid generation system, jointly with a battery bank, a variable ac load, and other generation subsystems. The operation strategy of the hybrid system determines two possible operation modes for the WECS, depending on the power requirements of the load and the wind availability. The paper deals with the design of a combined high-order sliding mode (HOSM) controller for the power control of the WECS on both operational modes. The main features of the obtained controller are its chattering-free behavior, its finite-time reaching phase, its simplicity, and its robustness with respect to external disturbances and unmodeled dynamics. The performance of the closed-loop system is assessed through representative computer simulations. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4560056&sortType%3Das [...]

Determination of battery storage capacity in energy buffer for wind farm / X. Y. Wang in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 868 - 878 Titre : Determination of battery storage capacity in energy buffer for wind farm Type de document : texte imprimé Auteurs : X. Y. Wang, Auteur ; Mahinda Vilathgamuwa, D., Auteur ; Choi, S. S., Auteur Année de publication : 2008 Article en page(s) : pp. 868 - 878 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Battery  storage  plants;  wind  power  plants Résumé : Design of a battery energy storage system (BESS) in a buffer scheme is examined for the purpose of attenuating the effects of unsteady input power from wind farms. The design problem is formulated as maximization of an objective function that measures the economic benefit obtainable from the dispatched power from the wind farm against the cost of the BESS. Solution to the problem results in the determination of the capacity of the BESS to ensure constant dispatched power to the connected grid, while the voltage level across the dc-link of the buffer is kept within preset limits. A computational procedure to determine the BESS capacity and the evaluation of the dc voltage is shown. Illustrative examples using the proposed design method are included. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4509448&sortType%3Das [...] [article] Determination of battery storage capacity in energy buffer for wind farm [texte imprimé] / X. Y. Wang, Auteur ; Mahinda Vilathgamuwa, D., Auteur ; Choi, S. S., Auteur . - 2008 . - pp. 868 - 878. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 868 - 878 Mots-clés : Battery  storage  plants;  wind  power  plants Résumé : Design of a battery energy storage system (BESS) in a buffer scheme is examined for the purpose of attenuating the effects of unsteady input power from wind farms. The design problem is formulated as maximization of an objective function that measures the economic benefit obtainable from the dispatched power from the wind farm against the cost of the BESS. Solution to the problem results in the determination of the capacity of the BESS to ensure constant dispatched power to the connected grid, while the voltage level across the dc-link of the buffer is kept within preset limits. A computational procedure to determine the BESS capacity and the evaluation of the dc voltage is shown. Illustrative examples using the proposed design method are included. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4509448&sortType%3Das [...]

VRLA battery virtual reference electrode / Hunter, P.M. in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 879 - 886 Titre : VRLA battery virtual reference electrode : battery float charge analysis Type de document : texte imprimé Auteurs : Hunter, P.M., Auteur ; Anbuky, A. H., Auteur Année de publication : 2008 Article en page(s) : pp. 879 - 886 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Electrochemical  electrodes;  lead  acid  batteries Résumé : This paper investigates the problems and deficiencies with present valve-regulated lead-acid (VRLA) battery float charge techniques. The requirements and goals of float charge are identified, and a mechanism for assessing the achievement of these goals is provided. An electrical equivalent model of a VRLA cell's float charge operational region is developed. This model replicates both the steady-state and transient responses of a float charging VRLA cell. Based on the response of each electrode within a cell to an applied stimulus, a simple test-and-analysis procedure is developed. This procedure extracts reference-electrode-like polarization information from any conventional 2 V VRLA cell in float service. This test procedure is applied to the terminals of a standard cell, and does not require any physical modification to the cell. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4554249&sortType%3Das [...] [article] VRLA battery virtual reference electrode : battery float charge analysis [texte imprimé] / Hunter, P.M., Auteur ; Anbuky, A. H., Auteur . - 2008 . - pp. 879 - 886. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 879 - 886 Mots-clés : Electrochemical  electrodes;  lead  acid  batteries Résumé : This paper investigates the problems and deficiencies with present valve-regulated lead-acid (VRLA) battery float charge techniques. The requirements and goals of float charge are identified, and a mechanism for assessing the achievement of these goals is provided. An electrical equivalent model of a VRLA cell's float charge operational region is developed. This model replicates both the steady-state and transient responses of a float charging VRLA cell. Based on the response of each electrode within a cell to an applied stimulus, a simple test-and-analysis procedure is developed. This procedure extracts reference-electrode-like polarization information from any conventional 2 V VRLA cell in float service. This test procedure is applied to the terminals of a standard cell, and does not require any physical modification to the cell. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4554249&sortType%3Das [...]

Neurofuzzy power system stabilizer / Chaturvedi, D. K. in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 887 - 894 Titre : Neurofuzzy power system stabilizer Type de document : texte imprimé Auteurs : Chaturvedi, D. K., Auteur ; Malik, O. P., Auteur Année de publication : 2008 Article en page(s) : pp. 887 - 894 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Control  engineering  computing;  fuzzy  control;  inference  mechanisms;  neurocontrollers;  power  engineering  computing;  power  system  control;  power  system  stability Résumé : An adaptive fuzzy logic power system stabilizer (AFPSS) consisting of a generalized neuron (GN)-based predictor and a fuzzy logic controller (FLC) is described. The inference mechanism of the FLC is represented by a rule-base and a database. Two parameters, decided on the basis of the GN-predictor output and the current system conditions, are used to tune the AFPSS. This mechanism of tuning makes the fuzzy logic-based power system stabilizer adaptive to changes in the operating conditions. Therefore, variation in the system response, under a wide range of operating conditions, is less compared to the system response with a fixed-parameter conventional PSS. The performance of the AFPSS has been tested by simulation and experimental studies. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4603061&sortType%3Das [...] [article] Neurofuzzy power system stabilizer [texte imprimé] / Chaturvedi, D. K., Auteur ; Malik, O. P., Auteur . - 2008 . - pp. 887 - 894. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 887 - 894 Mots-clés : Control  engineering  computing;  fuzzy  control;  inference  mechanisms;  neurocontrollers;  power  engineering  computing;  power  system  control;  power  system  stability Résumé : An adaptive fuzzy logic power system stabilizer (AFPSS) consisting of a generalized neuron (GN)-based predictor and a fuzzy logic controller (FLC) is described. The inference mechanism of the FLC is represented by a rule-base and a database. Two parameters, decided on the basis of the GN-predictor output and the current system conditions, are used to tune the AFPSS. This mechanism of tuning makes the fuzzy logic-based power system stabilizer adaptive to changes in the operating conditions. Therefore, variation in the system response, under a wide range of operating conditions, is less compared to the system response with a fixed-parameter conventional PSS. The performance of the AFPSS has been tested by simulation and experimental studies. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4603061&sortType%3Das [...]

Hybrid control of a grid-interactive wind energy conversion system / Khan, M.S. in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 895 - 902 Titre : Hybrid control of a grid-interactive wind energy conversion system Type de document : texte imprimé Auteurs : Khan, M.S., Auteur ; Iravani, M. R., Auteur Année de publication : 2008 Article en page(s) : pp. 895 - 902 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : PWM  power  convertors;  direct  energy  conversion;  overcurrent  protection;  power  grids;  wind  power Résumé : Without storage provision, a wind energy conversion system (WECS) does not have fault ride-through capability for most temporary faults on the utility feeder. This paper proposes a hybrid valve switching and control strategy for a voltage-sourced converter (VSC) used for interfacing a WECS to the utility grid. The hybrid control of the VSC ensures continuous operation of the system in the presence of temporary single line to ground faults on the utility feeder without the need for a storage provision. The fast acting hybrid control also limits reactive fault current contribution by the converter, and therefore, avoids problems associated with overcurrent protection of the feeder. The hybrid valve switching and control of the VSC consists of: 1) sinusoidal pulse width modulation (SPWM) based valve switching and current-controlled voltage-source operation of the VSC during normal system operating conditions and 2) hysteresis space vector modulation (HSVM) based switching together with controlled current-source operation of the VSC during temporary fault conditions. The hybrid control of the VSC isolates the WECS from the grid side disturbances to ensure uninterrupted operation of the unit. Simulation studies of the grid-interactive WECS in PSCAD/EMTDC confirm the validity of the proposed hybrid control scheme. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4505422&sortType%3Das [...] [article] Hybrid control of a grid-interactive wind energy conversion system [texte imprimé] / Khan, M.S., Auteur ; Iravani, M. R., Auteur . - 2008 . - pp. 895 - 902. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 895 - 902 Mots-clés : PWM  power  convertors;  direct  energy  conversion;  overcurrent  protection;  power  grids;  wind  power Résumé : Without storage provision, a wind energy conversion system (WECS) does not have fault ride-through capability for most temporary faults on the utility feeder. This paper proposes a hybrid valve switching and control strategy for a voltage-sourced converter (VSC) used for interfacing a WECS to the utility grid. The hybrid control of the VSC ensures continuous operation of the system in the presence of temporary single line to ground faults on the utility feeder without the need for a storage provision. The fast acting hybrid control also limits reactive fault current contribution by the converter, and therefore, avoids problems associated with overcurrent protection of the feeder. The hybrid valve switching and control of the VSC consists of: 1) sinusoidal pulse width modulation (SPWM) based valve switching and current-controlled voltage-source operation of the VSC during normal system operating conditions and 2) hysteresis space vector modulation (HSVM) based switching together with controlled current-source operation of the VSC during temporary fault conditions. The hybrid control of the VSC isolates the WECS from the grid side disturbances to ensure uninterrupted operation of the unit. Simulation studies of the grid-interactive WECS in PSCAD/EMTDC confirm the validity of the proposed hybrid control scheme. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4505422&sortType%3Das [...]

Modeling and control of grid-connected voltage-sourced converters under generalized unbalanced operation conditions / Jiabing Hu in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 903 - 913 Titre : Modeling and control of grid-connected voltage-sourced converters under generalized unbalanced operation conditions Type de document : texte imprimé Auteurs : Jiabing Hu, Auteur ; Yikang, He, Auteur Année de publication : 2008 Article en page(s) : pp. 903 - 913 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : PWM  power  convertors;  power  grids Résumé : This paper proposes a unified mathematical model of a voltage-sourced converter (VSC) based on positive and negative synchronously rotating frames under both unbalanced grid supply and imbalanced input impedances. Based on the developed model, a new definition of instantaneous reactive power is introduced, and an accurate mathematical model of the instantaneous active and reactive powers at different locations of the VSC is derived. To avoid the use of band-trap filter for decomposing the positive- and negative-sequence dq components of current and voltage, a new control scheme with multifrequency proportional-resonant controller in the stationary alphabeta frame is employed to improve the steady state and dynamic response under generalized unbalanced operation conditions. Simulation and experimental studies with various factors were conducted and compared under different types of unbalanced conditions. The simulated and experimental results demonstrate that the proposed control scheme in the stationary alphabeta frame provides sufficiently steady-state tracking capability for ac input current, and a better transient response in compensation for wide-range generalized unbalanced operation conditions. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4505421&sortType%3Das [...] [article] Modeling and control of grid-connected voltage-sourced converters under generalized unbalanced operation conditions [texte imprimé] / Jiabing Hu, Auteur ; Yikang, He, Auteur . - 2008 . - pp. 903 - 913. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 903 - 913 Mots-clés : PWM  power  convertors;  power  grids Résumé : This paper proposes a unified mathematical model of a voltage-sourced converter (VSC) based on positive and negative synchronously rotating frames under both unbalanced grid supply and imbalanced input impedances. Based on the developed model, a new definition of instantaneous reactive power is introduced, and an accurate mathematical model of the instantaneous active and reactive powers at different locations of the VSC is derived. To avoid the use of band-trap filter for decomposing the positive- and negative-sequence dq components of current and voltage, a new control scheme with multifrequency proportional-resonant controller in the stationary alphabeta frame is employed to improve the steady state and dynamic response under generalized unbalanced operation conditions. Simulation and experimental studies with various factors were conducted and compared under different types of unbalanced conditions. The simulated and experimental results demonstrate that the proposed control scheme in the stationary alphabeta frame provides sufficiently steady-state tracking capability for ac input current, and a better transient response in compensation for wide-range generalized unbalanced operation conditions. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4505421&sortType%3Das [...]

Power system stabilizer design using an online adaptive neurofuzzy controller with adaptive input link weights / Ramirez-Gonzalez, M. in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 914 - 922 Titre : Power system stabilizer design using an online adaptive neurofuzzy controller with adaptive input link weights Type de document : texte imprimé Auteurs : Ramirez-Gonzalez, M., Auteur ; Malik, O. P., Auteur Année de publication : 2008 Article en page(s) : pp. 914 - 922 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Adaptive  control;  fuzzy  control;  fuzzy  set  theory;  gradient  methods;  neurocontrollers;  power  system  stability Résumé : A neurofuzzy controller (NFC) with adaptive input link weights (ILWs) and working as an adaptive power system stabilizer is presented. The control structure of the proposed adaptive neurofuzzy power system stabilizers (ANFPSSs) consists of a neuroidentifier to track the dynamic behavior of the plant and an NFC to damp the low-frequency power system oscillations. Usually, the input membership functions (IMFs) and consequent parameters (CPs) are adapted in order to enhance the performance of the NFC. However, the adjustment of IMFs can be realized indirectly by the tuning of ILWs introduced here, which is simpler due to the small number of parameters involved. Therefore, in this paper, ILWs and CPs are updated online by the gradient descent method. Simulation studies over a range of operating conditions and disturbances in a single machine-infinite bus system and a multimachine power system demonstrate the improvement in the dynamic performance of the system with the proposed ANFPSS. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4537513&sortType%3Das [...] [article] Power system stabilizer design using an online adaptive neurofuzzy controller with adaptive input link weights [texte imprimé] / Ramirez-Gonzalez, M., Auteur ; Malik, O. P., Auteur . - 2008 . - pp. 914 - 922. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 914 - 922 Mots-clés : Adaptive  control;  fuzzy  control;  fuzzy  set  theory;  gradient  methods;  neurocontrollers;  power  system  stability Résumé : A neurofuzzy controller (NFC) with adaptive input link weights (ILWs) and working as an adaptive power system stabilizer is presented. The control structure of the proposed adaptive neurofuzzy power system stabilizers (ANFPSSs) consists of a neuroidentifier to track the dynamic behavior of the plant and an NFC to damp the low-frequency power system oscillations. Usually, the input membership functions (IMFs) and consequent parameters (CPs) are adapted in order to enhance the performance of the NFC. However, the adjustment of IMFs can be realized indirectly by the tuning of ILWs introduced here, which is simpler due to the small number of parameters involved. Therefore, in this paper, ILWs and CPs are updated online by the gradient descent method. Simulation studies over a range of operating conditions and disturbances in a single machine-infinite bus system and a multimachine power system demonstrate the improvement in the dynamic performance of the system with the proposed ANFPSS. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4537513&sortType%3Das [...]

Impact of positive-feedback anti-islanding methods on small-signal stability of inverter-based distributed generation / Xiaoyu, Wang in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 923 - 931 Titre : Impact of positive-feedback anti-islanding methods on small-signal stability of inverter-based distributed generation Type de document : texte imprimé Auteurs : Xiaoyu, Wang, Auteur ; Freitas, W., Auteur Année de publication : 2008 Article en page(s) : pp. 923 - 931 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Distributed  power  generation;  feedback;  invertors;  power  grids;  power  system  stability Résumé : This paper investigates the impact of positive-feedback anti-islanding methods on the small-signal stability of grid-connected inverter-based distributed generation. The maximum power transfer capability of a distributed generator (DG) is analyzed. Sensitivity studies are conducted for DGs equipped with the Sandia frequency shift anti-islanding scheme. Factors such as positive-feedback gain, initial chopping fraction, local load level, and network line impedance are investigated. The maximum power transfer limit versus positive-feedback gain curve is proposed as an index for the stability analysis. The results show that the positive-feedback anti-islanding scheme does have the potential to destabilize the grid-connected DG system when the grid is weak or the DG size is large. A curve that relates the maximum stable DG power transfer level versus the islanding detection time is proposed to quantify the destabilizing effect of the positive-feedback-based anti-islanding schemes. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4567146&sortType%3Das [...] [article] Impact of positive-feedback anti-islanding methods on small-signal stability of inverter-based distributed generation [texte imprimé] / Xiaoyu, Wang, Auteur ; Freitas, W., Auteur . - 2008 . - pp. 923 - 931. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 923 - 931 Mots-clés : Distributed  power  generation;  feedback;  invertors;  power  grids;  power  system  stability Résumé : This paper investigates the impact of positive-feedback anti-islanding methods on the small-signal stability of grid-connected inverter-based distributed generation. The maximum power transfer capability of a distributed generator (DG) is analyzed. Sensitivity studies are conducted for DGs equipped with the Sandia frequency shift anti-islanding scheme. Factors such as positive-feedback gain, initial chopping fraction, local load level, and network line impedance are investigated. The maximum power transfer limit versus positive-feedback gain curve is proposed as an index for the stability analysis. The results show that the positive-feedback anti-islanding scheme does have the potential to destabilize the grid-connected DG system when the grid is weak or the DG size is large. A curve that relates the maximum stable DG power transfer level versus the islanding detection time is proposed to quantify the destabilizing effect of the positive-feedback-based anti-islanding schemes. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4567146&sortType%3Das [...]

Design of a back-to-back NPC onverter interface for wind turbines with squirrel-cage induction generator / Bueno, E. J. in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 932 - 945 Titre : Design of a back-to-back NPC onverter interface for wind turbines with squirrel-cage induction generator Type de document : texte imprimé Auteurs : Bueno, E. J., Auteur ; Cobreces, S., Auteur ; Rodriguez, F.J., Auteur Année de publication : 2008 Article en page(s) : pp. 932 - 945 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Asynchronous  generators;  power  convertors;  power  electronics;  power  generation  faults;  power  grids;  wind  power;  wind  turbines Résumé : As the number of wind power applications with power electronic interfaces in the grid increases, it is becoming unacceptable to disconnect the generating units every time disturbances occur, especially under voltage dips, as was a common practice in the past. Keeping the converter online during unbalanced voltage, and guaranteeing the actual standards of the converter connected to the grid, is becoming a very critical issue. From these goals, the design of a robust back-to-back neutral point clamped (three levels) voltage source converter of 150 kVA is developed in this paper. The converter is divided into two main parts: the power electronic system and the control electronic system. Concerning the first part, on the one hand, the paper presents the designs of active and passive components as insulated gate bipolar transistor, free-wheeling diodes, clamping diodes, grid filter, DC-bus capacitors, etc.; and on the other hand, the converter requirements are analyzed to ride through real grid conditions, i.e., unbalanced voltage dips. Concerning the control electronic system, the chosen electronic structure and the task distribution between the two processors used are shown. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4489612&sortType%3Das [...] [article] Design of a back-to-back NPC onverter interface for wind turbines with squirrel-cage induction generator [texte imprimé] / Bueno, E. J., Auteur ; Cobreces, S., Auteur ; Rodriguez, F.J., Auteur . - 2008 . - pp. 932 - 945. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 932 - 945 Mots-clés : Asynchronous  generators;  power  convertors;  power  electronics;  power  generation  faults;  power  grids;  wind  power;  wind  turbines Résumé : As the number of wind power applications with power electronic interfaces in the grid increases, it is becoming unacceptable to disconnect the generating units every time disturbances occur, especially under voltage dips, as was a common practice in the past. Keeping the converter online during unbalanced voltage, and guaranteeing the actual standards of the converter connected to the grid, is becoming a very critical issue. From these goals, the design of a robust back-to-back neutral point clamped (three levels) voltage source converter of 150 kVA is developed in this paper. The converter is divided into two main parts: the power electronic system and the control electronic system. Concerning the first part, on the one hand, the paper presents the designs of active and passive components as insulated gate bipolar transistor, free-wheeling diodes, clamping diodes, grid filter, DC-bus capacitors, etc.; and on the other hand, the converter requirements are analyzed to ride through real grid conditions, i.e., unbalanced voltage dips. Concerning the control electronic system, the chosen electronic structure and the task distribution between the two processors used are shown. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4489612&sortType%3Das [...]

Adaptive voltage regulator design for synchronous generator / Fusco, G. in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 946 - 956 Titre : Adaptive voltage regulator design for synchronous generator Type de document : texte imprimé Auteurs : Fusco, G., Auteur ; Russo, M., Auteur Année de publication : 2008 Article en page(s) : pp. 946 - 956 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Kalman  filters;  adaptive  control;  equivalent  circuits;  synchronous  generators;  three-term  control;  voltage  control;  voltage  regulators Résumé : This paper presents the adaptive design of an automatic voltage regulator (AVR) control scheme for synchronous generators that is capable of providing satisfactory voltage control performance in the presence of unknown variations of the power system operating conditions. The design is articulated in four steps: voltage and current phasor estimation, estimation of the parameters of the Thevenin equivalent circuit adopted to represent the power system response using a steady-state model, determination of the sampled-data transfer function of the system, and AVR design developed according to discrete-time techniques. A suitable procedure is described to derive the sampled-data transfer function of the system starting from models of the power system, synchronous generator, and exciter. The obtained transfer function depends on the estimated parameters yielded by a recursive least-squares algorithm subject to constraints deriving from the Thevenin circuit. The AVR design is based on the pole-assignment technique while the phasors estimation is performed by two Kalman filters. Finally, the results of accurate numerical simulations conducted for a test network are reported, comparing the performance of the proposed adaptive control scheme to the one of a PID controller with fixed parameters. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4505420&sortType%3Das [...] [article] Adaptive voltage regulator design for synchronous generator [texte imprimé] / Fusco, G., Auteur ; Russo, M., Auteur . - 2008 . - pp. 946 - 956. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 946 - 956 Mots-clés : Kalman  filters;  adaptive  control;  equivalent  circuits;  synchronous  generators;  three-term  control;  voltage  control;  voltage  regulators Résumé : This paper presents the adaptive design of an automatic voltage regulator (AVR) control scheme for synchronous generators that is capable of providing satisfactory voltage control performance in the presence of unknown variations of the power system operating conditions. The design is articulated in four steps: voltage and current phasor estimation, estimation of the parameters of the Thevenin equivalent circuit adopted to represent the power system response using a steady-state model, determination of the sampled-data transfer function of the system, and AVR design developed according to discrete-time techniques. A suitable procedure is described to derive the sampled-data transfer function of the system starting from models of the power system, synchronous generator, and exciter. The obtained transfer function depends on the estimated parameters yielded by a recursive least-squares algorithm subject to constraints deriving from the Thevenin circuit. The AVR design is based on the pole-assignment technique while the phasors estimation is performed by two Kalman filters. Finally, the results of accurate numerical simulations conducted for a test network are reported, comparing the performance of the proposed adaptive control scheme to the one of a PID controller with fixed parameters. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4505420&sortType%3Das [...]

Power management of a stand-alone wind/photovoltaic/fuel cell energy system / Caisheng, Wang in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 957 - 967 Titre : Power management of a stand-alone wind/photovoltaic/fuel cell energy system Type de document : texte imprimé Auteurs : Caisheng, Wang, Auteur ; Nehrir, M.H., Auteur Année de publication : 2008 Article en page(s) : pp. 957 - 967 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Fuel  cell  power  plants;  hybrid  power  systems;  photovoltaic  power  systems;  power  system  management;  wind  power  plants Résumé : This paper proposes an AC-linked hybrid wind/photovoltaic (PV)/fuel cell (FC) alternative energy system for stand-alone applications. Wind and PV are the primary power sources of the system, and an FC-electrolyzer combination is used as a backup and a long-term storage system. An overall power management strategy is designed for the proposed system to manage power flows among the different energy sources and the storage unit in the system. A simulation model for the hybrid energy system has been developed using MATLAB/Simulink. The system performance under different scenarios has been verified by carrying out simulation studies using a practical load demand profile and real weather data. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4603068&sortType%3Das [...] [article] Power management of a stand-alone wind/photovoltaic/fuel cell energy system [texte imprimé] / Caisheng, Wang, Auteur ; Nehrir, M.H., Auteur . - 2008 . - pp. 957 - 967. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 957 - 967 Mots-clés : Fuel  cell  power  plants;  hybrid  power  systems;  photovoltaic  power  systems;  power  system  management;  wind  power  plants Résumé : This paper proposes an AC-linked hybrid wind/photovoltaic (PV)/fuel cell (FC) alternative energy system for stand-alone applications. Wind and PV are the primary power sources of the system, and an FC-electrolyzer combination is used as a backup and a long-term storage system. An overall power management strategy is designed for the proposed system to manage power flows among the different energy sources and the storage unit in the system. A simulation model for the hybrid energy system has been developed using MATLAB/Simulink. The system performance under different scenarios has been verified by carrying out simulation studies using a practical load demand profile and real weather data. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4603068&sortType%3Das [...]

Time-series-based maximization of distributed wind power generation integration / Ochoa, L.F. in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 968 - 974 Titre : Time-series-based maximization of distributed wind power generation integration Type de document : texte imprimé Auteurs : Ochoa, L.F., Auteur ; Padilha-Feltrin, A., Auteur ; Harrison, G.P., Auteur Année de publication : 2008 Article en page(s) : pp. 968 - 974 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Pareto  optimisation;  distributed  power  generation;  distribution  networks;  genetic  algorithms;  time  series;  wind  power;  wind  turbines Résumé : Energy policies and technological progress in the development of wind turbines have made wind power the fastest growing renewable power source worldwide. The inherent variability of this resource requires special attention when analyzing the impacts of high penetration on the distribution network. A time-series steady-state analysis is proposed that assesses technical issues such as energy export, losses, and short-circuit levels. A multiobjective programming approach based on the nondominated sorting genetic algorithm (NSGA) is applied in order to find configurations that maximize the integration of distributed wind power generation (DWPG) while satisfying voltage and thermal limits. The approach has been applied to a medium voltage distribution network considering hourly demand and wind profiles for part of the U.K. The Pareto optimal solutions obtained highlight the drawbacks of using a single demand and generation scenario, and indicate the importance of appropriate substation voltage settings for maximizing the connection of DWPG. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4556651&sortType%3Das [...] [article] Time-series-based maximization of distributed wind power generation integration [texte imprimé] / Ochoa, L.F., Auteur ; Padilha-Feltrin, A., Auteur ; Harrison, G.P., Auteur . - 2008 . - pp. 968 - 974. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 968 - 974 Mots-clés : Pareto  optimisation;  distributed  power  generation;  distribution  networks;  genetic  algorithms;  time  series;  wind  power;  wind  turbines Résumé : Energy policies and technological progress in the development of wind turbines have made wind power the fastest growing renewable power source worldwide. The inherent variability of this resource requires special attention when analyzing the impacts of high penetration on the distribution network. A time-series steady-state analysis is proposed that assesses technical issues such as energy export, losses, and short-circuit levels. A multiobjective programming approach based on the nondominated sorting genetic algorithm (NSGA) is applied in order to find configurations that maximize the integration of distributed wind power generation (DWPG) while satisfying voltage and thermal limits. The approach has been applied to a medium voltage distribution network considering hourly demand and wind profiles for part of the U.K. The Pareto optimal solutions obtained highlight the drawbacks of using a single demand and generation scenario, and indicate the importance of appropriate substation voltage settings for maximizing the connection of DWPG. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4556651&sortType%3Das [...]

Energy-reliability optimization of wind energy conversion systems by sliding mode control / Munteanu, I. in IEEE transactions on energy conversion, Vol. 23 n°3 (Septembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 975 - 985 Titre : Energy-reliability optimization of wind energy conversion systems by sliding mode control Type de document : texte imprimé Auteurs : Munteanu, I., Auteur ; Seddik Bacha, Auteur ; Bratcu, A.I., Auteur Année de publication : 2008 Article en page(s) : pp. 975 - 985 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Power  generation  control;  power  generation  reliability;  torque  control;  variable  structure  systems;  wind  power;  wind  turbines Résumé : This paper describes a manner in which the energy-reliability optimization of wind energy conversion systemspsila operation can be achieved by means of the sliding mode control. The proposed approach aims at designing a tradeoff between maximizing the power harvested from wind by a horizontal-axis-grid-connected variable-speed doubly-fed-induction-generator-based wind power system and minimizing its mechanical stress. An appropriate sliding surface has been found in the speed-power plane, which allows the operation more or less close to the optimal regimes characteristic. Thus, by torque controlling the generator, an energy-reliability optimization of the wind turbine behavior is performed. The proposed control law is validated by both off-line and real-time simulation; the latter on a dedicated experimental rig, based upon the hardware-in-the-loop simulation concept. The results show that the control objective is fully accomplished. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4558416&sortType%3Das [...] [article] Energy-reliability optimization of wind energy conversion systems by sliding mode control [texte imprimé] / Munteanu, I., Auteur ; Seddik Bacha, Auteur ; Bratcu, A.I., Auteur . - 2008 . - pp. 975 - 985. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°3 (Septembre 2008) . - pp. 975 - 985 Mots-clés : Power  generation  control;  power  generation  reliability;  torque  control;  variable  structure  systems;  wind  power;  wind  turbines Résumé : This paper describes a manner in which the energy-reliability optimization of wind energy conversion systemspsila operation can be achieved by means of the sliding mode control. The proposed approach aims at designing a tradeoff between maximizing the power harvested from wind by a horizontal-axis-grid-connected variable-speed doubly-fed-induction-generator-based wind power system and minimizing its mechanical stress. An appropriate sliding surface has been found in the speed-power plane, which allows the operation more or less close to the optimal regimes characteristic. Thus, by torque controlling the generator, an energy-reliability optimization of the wind turbine behavior is performed. The proposed control law is validated by both off-line and real-time simulation; the latter on a dedicated experimental rig, based upon the hardware-in-the-loop simulation concept. The results show that the control objective is fully accomplished. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4558416&sortType%3Das [...]

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