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IEEE Transactions on energy conversion |
Dépouillements
Ajouter le résultat dans votre panierPiezoelectric actuator design and placement for switched reluctance motors active damping / Ojeda, X. in IEEE transactions on energy conversion, Vol. 24 N° 2 (Juin 2009)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 305 - 313
Titre : Piezoelectric actuator design and placement for switched reluctance motors active damping Type de document : texte imprimé Auteurs : Ojeda, X., Auteur ; Mininger, X., Auteur ; Hamid Ben Ahmed, Auteur Année de publication : 2009 Article en page(s) : pp. 305 - 313 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Active filters; damping; finite element analysis; genetic algorithms; minimisation; piezoelectric actuators; reluctance motors; stators; vibrations Résumé : This paper describes the design and the placement of piezoelectric actuators on switched reluctance motors by means of a genetic algorithm (nondominated sorting genetic algorithm II) for the purpose of reducing stator vibrations. Two distinct approaches are presented: one energy-related and the other based on a minimization of the resultant displacement. These methods lead to design and placement strategy for the piezoelectric actuators. A number of optimal actuators obtained using these kinds of approaches is also compared with mechanical finite-element simulations. At last, a solution is achieved in order to validate optimal placement using positive position feedback active filtering. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957564&sortType%3Das [...] [article] Piezoelectric actuator design and placement for switched reluctance motors active damping [texte imprimé] / Ojeda, X., Auteur ; Mininger, X., Auteur ; Hamid Ben Ahmed, Auteur . - 2009 . - pp. 305 - 313.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 305 - 313
Mots-clés : Active filters; damping; finite element analysis; genetic algorithms; minimisation; piezoelectric actuators; reluctance motors; stators; vibrations Résumé : This paper describes the design and the placement of piezoelectric actuators on switched reluctance motors by means of a genetic algorithm (nondominated sorting genetic algorithm II) for the purpose of reducing stator vibrations. Two distinct approaches are presented: one energy-related and the other based on a minimization of the resultant displacement. These methods lead to design and placement strategy for the piezoelectric actuators. A number of optimal actuators obtained using these kinds of approaches is also compared with mechanical finite-element simulations. At last, a solution is achieved in order to validate optimal placement using positive position feedback active filtering. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957564&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 314 - 322
Titre : “Active flux” DTFC-SVM sensorless control of IPMSM Type de document : texte imprimé Auteurs : Boldea, I., Auteur ; Paicu, M. C., Auteur ; Andreescu, G., Auteur Année de publication : 2009 Article en page(s) : pp. 314 - 322 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : AC machines; machine control; permanent magnet motors; rotors; synchronous motors; torque control Résumé : This paper proposes an implementation of a motion-sensorless control system in wide speed range based on "active flux" observer, and direct torque and flux control with space vector modulation (DTFC-SVM) for the interior permanent magnet synchronous motor (IPMSM), without signal injection. The concept of "active flux" (or "torque producing flux") turns all the rotor salient-pole ac machines into fully nonsalient-pole ones. A new function for Lq inductance depending on torque is introduced to model the magnetic saturation. Notable simplification in the rotor position and speed estimation is obtained, because the active flux position is identical with the rotor position. Extensive experimental results are presented to verify the principles and to demonstrate the effectiveness of the proposed sensorless control system. With the active flux observer, the IPMSM drive system operates from very low speed of 2 r/min at half full-load up to 1400 r/min. Higher speed is possible, in principle, with flux weakening. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957565&sortType%3Das [...] [article] “Active flux” DTFC-SVM sensorless control of IPMSM [texte imprimé] / Boldea, I., Auteur ; Paicu, M. C., Auteur ; Andreescu, G., Auteur . - 2009 . - pp. 314 - 322.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 314 - 322
Mots-clés : AC machines; machine control; permanent magnet motors; rotors; synchronous motors; torque control Résumé : This paper proposes an implementation of a motion-sensorless control system in wide speed range based on "active flux" observer, and direct torque and flux control with space vector modulation (DTFC-SVM) for the interior permanent magnet synchronous motor (IPMSM), without signal injection. The concept of "active flux" (or "torque producing flux") turns all the rotor salient-pole ac machines into fully nonsalient-pole ones. A new function for Lq inductance depending on torque is introduced to model the magnetic saturation. Notable simplification in the rotor position and speed estimation is obtained, because the active flux position is identical with the rotor position. Extensive experimental results are presented to verify the principles and to demonstrate the effectiveness of the proposed sensorless control system. With the active flux observer, the IPMSM drive system operates from very low speed of 2 r/min at half full-load up to 1400 r/min. Higher speed is possible, in principle, with flux weakening. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957565&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 323 - 328
Titre : Impact of MMF space harmonic on rotor losses in fractional-slot permanent-magnet machines Type de document : texte imprimé Auteurs : Bianchi, N., Auteur ; Fornasiero, E., Auteur Année de publication : 2009 Article en page(s) : pp. 323 - 328 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Air gaps; losses; permanent magnet machines; power system harmonics; rotors; torque Résumé : The fractional-slot permanent-magnet (PM) machines are used in many applications due to their high torque density, low torque ripple, and high efficiency. However, the fractional-slot machines are characterized by high contents of space harmonics in the air-gap MMF distribution. Such harmonics cause flux variation in the air gap, and the main consequence is the induced losses in the rotor. Depending on the combination of slots and poles of the machine, there are different harmonic contents and then rotor losses. By means of a simple model of the rotor losses, this paper investigates the link between the rotor losses and the combination of the slots and the poles of the fractional-slot PM machines. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4757261&sortType%3Das [...] [article] Impact of MMF space harmonic on rotor losses in fractional-slot permanent-magnet machines [texte imprimé] / Bianchi, N., Auteur ; Fornasiero, E., Auteur . - 2009 . - pp. 323 - 328.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 323 - 328
Mots-clés : Air gaps; losses; permanent magnet machines; power system harmonics; rotors; torque Résumé : The fractional-slot permanent-magnet (PM) machines are used in many applications due to their high torque density, low torque ripple, and high efficiency. However, the fractional-slot machines are characterized by high contents of space harmonics in the air-gap MMF distribution. Such harmonics cause flux variation in the air gap, and the main consequence is the induced losses in the rotor. Depending on the combination of slots and poles of the machine, there are different harmonic contents and then rotor losses. By means of a simple model of the rotor losses, this paper investigates the link between the rotor losses and the combination of the slots and the poles of the fractional-slot PM machines. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4757261&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 329 - 337
Titre : Synchronous generator output voltage real-time feedback control via H infinity strategy Type de document : texte imprimé Auteurs : Mouni, E., Auteur ; Tnani, S., Auteur ; Champenois, G., Auteur Année de publication : 2009 Article en page(s) : pp. 329 - 337 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : H infin control; feedback; machine control; permanent magnet generators; real-time systems; synchronous generators; time-domain analysis; voltage control Résumé : A new approach on synchronous generator (SG) output voltage control is presented. The originality of such a strategy is based on the excitation structure that integrates a permanent-magnet generator combined with a modern control method: the H infin. The main motivation of this paper is the debatable results obtained with the classical excitation structure controlled by a traditional PID controller. The SG model as well as the control strategy will be presented. The implementation in real time domain and a comparison with the classical structure will allow us to prove the efficiency of the proposed structure compared to the classical one as regards the reference tracking and signal quality. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4749294&sortType%3Das [...] [article] Synchronous generator output voltage real-time feedback control via H infinity strategy [texte imprimé] / Mouni, E., Auteur ; Tnani, S., Auteur ; Champenois, G., Auteur . - 2009 . - pp. 329 - 337.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 329 - 337
Mots-clés : H infin control; feedback; machine control; permanent magnet generators; real-time systems; synchronous generators; time-domain analysis; voltage control Résumé : A new approach on synchronous generator (SG) output voltage control is presented. The originality of such a strategy is based on the excitation structure that integrates a permanent-magnet generator combined with a modern control method: the H infin. The main motivation of this paper is the debatable results obtained with the classical excitation structure controlled by a traditional PID controller. The SG model as well as the control strategy will be presented. The implementation in real time domain and a comparison with the classical structure will allow us to prove the efficiency of the proposed structure compared to the classical one as regards the reference tracking and signal quality. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4749294&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 338 - 346
Titre : Population-based design of surface-mounted permanent-magnet synchronous machines Type de document : texte imprimé Auteurs : Cassimere, B. N., Auteur ; Sudhoff, S. D., Auteur Année de publication : 2009 Article en page(s) : pp. 338 - 346 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Genetic algorithms; particle swarm optimisation; permanent magnet machines; synchronous machines; torque Résumé : Permanent-magnet synchronous machines can be designed to obtain high efficiency and high torque density. Population-based optimization methods such as genetic algorithms and particle swarm optimization are gaining acceptance as a means of optimizing the design of this class of machines. This paper builds on the literature by utilizing a computationally efficient machine analysis appropriate for use with population-based optimization methods that enables the consideration of a significantly larger search space than previously reported in the literature. It is also unique in that the relative performance of different parameter encoding and objective function formulations are considered. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957566&sortType%3Das [...] [article] Population-based design of surface-mounted permanent-magnet synchronous machines [texte imprimé] / Cassimere, B. N., Auteur ; Sudhoff, S. D., Auteur . - 2009 . - pp. 338 - 346.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 338 - 346
Mots-clés : Genetic algorithms; particle swarm optimisation; permanent magnet machines; synchronous machines; torque Résumé : Permanent-magnet synchronous machines can be designed to obtain high efficiency and high torque density. Population-based optimization methods such as genetic algorithms and particle swarm optimization are gaining acceptance as a means of optimizing the design of this class of machines. This paper builds on the literature by utilizing a computationally efficient machine analysis appropriate for use with population-based optimization methods that enables the consideration of a significantly larger search space than previously reported in the literature. It is also unique in that the relative performance of different parameter encoding and objective function formulations are considered. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957566&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 347 - 357
Titre : Analytical design model for surface-mounted permanent-magnet synchronous machines Type de document : texte imprimé Auteurs : Cassimere, B. N., Auteur ; Sudhoff, S. D., Auteur ; Sudhoff, D. H., Auteur Année de publication : 2009 Article en page(s) : pp. 347 - 357 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Permanent magnet machines; synchronous machines Résumé : Design of electric machinery using population-based optimization requires a highly computationally efficient means of predicting the field distribution as well as the lumped-circuit model parameters. This paper proposes and validates a relatively straightforward analysis appropriate to this end. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957567&sortType%3Das [...] [article] Analytical design model for surface-mounted permanent-magnet synchronous machines [texte imprimé] / Cassimere, B. N., Auteur ; Sudhoff, S. D., Auteur ; Sudhoff, D. H., Auteur . - 2009 . - pp. 347 - 357.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 347 - 357
Mots-clés : Permanent magnet machines; synchronous machines Résumé : Design of electric machinery using population-based optimization requires a highly computationally efficient means of predicting the field distribution as well as the lumped-circuit model parameters. This paper proposes and validates a relatively straightforward analysis appropriate to this end. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957567&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 358 - 365
Titre : A novel method of evaluating performance characteristics of a self-excited induction generator Type de document : texte imprimé Auteurs : Haque, M.H., Auteur Année de publication : 2009 Article en page(s) : pp. 358 - 365 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Asynchronous generators; mathematics computing; nonlinear equations Résumé : Self-excited induction generators (SEIG) are increasingly being used in isolated areas to generate electrical energy from both conventional and nonconventional energy sources. This paper proposes a novel method of evaluating the steady-state performance characteristics of a SEIG under various operating conditions. The criteria for the constant terminal voltage and the constant-stator-current operations are also derived and embedded into the system of equations. Unlike the previous methods of analysis, the problem is formulated in a simple and straightforward way without going through lengthy and tedious derivation for the coefficients of a set of nonlinear equations. The formulated problem is then solved using a numerical-based routine ldquofsolverdquo given in MATLAB. The effectiveness of the proposed method is then evaluated on a 220-V, 1.5-kW induction generator for various operating conditions. Some of the simulation results obtained by the proposed method are also compared with the corresponding experimental values and are found to be in very good agreement. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957568&sortType%3Das [...] [article] A novel method of evaluating performance characteristics of a self-excited induction generator [texte imprimé] / Haque, M.H., Auteur . - 2009 . - pp. 358 - 365.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 358 - 365
Mots-clés : Asynchronous generators; mathematics computing; nonlinear equations Résumé : Self-excited induction generators (SEIG) are increasingly being used in isolated areas to generate electrical energy from both conventional and nonconventional energy sources. This paper proposes a novel method of evaluating the steady-state performance characteristics of a SEIG under various operating conditions. The criteria for the constant terminal voltage and the constant-stator-current operations are also derived and embedded into the system of equations. Unlike the previous methods of analysis, the problem is formulated in a simple and straightforward way without going through lengthy and tedious derivation for the coefficients of a set of nonlinear equations. The formulated problem is then solved using a numerical-based routine ldquofsolverdquo given in MATLAB. The effectiveness of the proposed method is then evaluated on a 220-V, 1.5-kW induction generator for various operating conditions. Some of the simulation results obtained by the proposed method are also compared with the corresponding experimental values and are found to be in very good agreement. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957568&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 366 - 374
Titre : A field reconstruction technique for efficient modeling of the fields and forces within induction machines Type de document : texte imprimé Auteurs : Dezheng, Wu, Auteur ; Pekarek, S.D., Auteur ; Fahimi, B., Auteur Année de publication : 2009 Article en page(s) : pp. 366 - 374 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Asynchronous machines; computational complexity; finite element analysis Résumé : Traditional analysis and design of induction machines have been largely based upon lumped-parameter models. An alternative tool used for field-based evaluations of an induction machine is the finite-element method. Although useful, its computational complexity limits its use as a design tool. In this paper, a field reconstruction (FR) method for induction machine simulation is introduced. The FR method utilizes a small number of finite-element evaluations to establish basis functions of normal and tangential flux densities. The basis functions are then used to estimate the magnetic field under arbitrary stator excitation. Using such a tool, evaluation of fields and forces produced by a machine under alternative excitation strategies can be explored efficiently. Moreover, alternative field-based derivation of stator/rotor excitation control can be explored. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957569&sortType%3Das [...] [article] A field reconstruction technique for efficient modeling of the fields and forces within induction machines [texte imprimé] / Dezheng, Wu, Auteur ; Pekarek, S.D., Auteur ; Fahimi, B., Auteur . - 2009 . - pp. 366 - 374.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 366 - 374
Mots-clés : Asynchronous machines; computational complexity; finite element analysis Résumé : Traditional analysis and design of induction machines have been largely based upon lumped-parameter models. An alternative tool used for field-based evaluations of an induction machine is the finite-element method. Although useful, its computational complexity limits its use as a design tool. In this paper, a field reconstruction (FR) method for induction machine simulation is introduced. The FR method utilizes a small number of finite-element evaluations to establish basis functions of normal and tangential flux densities. The basis functions are then used to estimate the magnetic field under arbitrary stator excitation. Using such a tool, evaluation of fields and forces produced by a machine under alternative excitation strategies can be explored efficiently. Moreover, alternative field-based derivation of stator/rotor excitation control can be explored. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957569&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 375 - 387
Titre : Real-time speed and flux adaptive control of induction motors using unknown time-varying rotor resistance and load torque Type de document : texte imprimé Auteurs : Kenne, Godpromesse, Auteur ; Ahmed Ali, Tarek, Auteur ; Françoise Lamnabhi-Lagarrigue, Auteur Année de publication : 2009 Article en page(s) : pp. 375 - 387 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Adaptive control; induction motors; machine control; magnetic flux; magnetic variables control; stators; velocity control Résumé : In this paper, an algorithm for direct speed and flux adaptive control of induction motors using unknown time-varying rotor resistance and load torque is described and validated with experimental results. This method is based on the variable structure theories and is potentially useful for adjusting online the induction motor controller unknown parameters (load torque and rotor resistance). The presented nonlinear compensator provides voltage inputs on the basis of rotor speed and stator current measurements, and generates estimates for both the unknown parameters and the nonmeasurable state variables (rotor flux and derivatives of the stator current and voltage) that converge to the corresponding true values. Experiments show that the proposed method achieved very good tracking performance within a wide range of the operation of the induction motor with online variation of the rotor resistance: up to (87%). This high tracking performance of the rotor resistance variation demonstrates that the proposed adaptive control is beneficial for motor efficiency. The proposed algorithm also presented high decoupling performance and very interesting robustness properties with respect to the variation of the stator resistance (up to 100%), measurement noise, modeling errors, discretization effects, and parameter uncertainties (e.g., inaccuracies on motor inductance values). The other interesting feature of the proposed method is that it is simple and easily implementable in real time. Comparative results have shown that the proposed adaptive control decouples speed and flux tracking while standard field-oriented control does not. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957570&sortType%3Das [...] [article] Real-time speed and flux adaptive control of induction motors using unknown time-varying rotor resistance and load torque [texte imprimé] / Kenne, Godpromesse, Auteur ; Ahmed Ali, Tarek, Auteur ; Françoise Lamnabhi-Lagarrigue, Auteur . - 2009 . - pp. 375 - 387.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 375 - 387
Mots-clés : Adaptive control; induction motors; machine control; magnetic flux; magnetic variables control; stators; velocity control Résumé : In this paper, an algorithm for direct speed and flux adaptive control of induction motors using unknown time-varying rotor resistance and load torque is described and validated with experimental results. This method is based on the variable structure theories and is potentially useful for adjusting online the induction motor controller unknown parameters (load torque and rotor resistance). The presented nonlinear compensator provides voltage inputs on the basis of rotor speed and stator current measurements, and generates estimates for both the unknown parameters and the nonmeasurable state variables (rotor flux and derivatives of the stator current and voltage) that converge to the corresponding true values. Experiments show that the proposed method achieved very good tracking performance within a wide range of the operation of the induction motor with online variation of the rotor resistance: up to (87%). This high tracking performance of the rotor resistance variation demonstrates that the proposed adaptive control is beneficial for motor efficiency. The proposed algorithm also presented high decoupling performance and very interesting robustness properties with respect to the variation of the stator resistance (up to 100%), measurement noise, modeling errors, discretization effects, and parameter uncertainties (e.g., inaccuracies on motor inductance values). The other interesting feature of the proposed method is that it is simple and easily implementable in real time. Comparative results have shown that the proposed adaptive control decouples speed and flux tracking while standard field-oriented control does not. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957570&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 388 - 396
Titre : A comparison of nodal- and mesh-based magnetic equivalent circuit models Type de document : texte imprimé Auteurs : Derbas, Hamza W., Auteur ; Williams, Joshua M., Auteur ; Koenig, Andreas C., Auteur Année de publication : 2009 Article en page(s) : pp. 388 - 396 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Newton-Raphson method; equivalent circuits; machine theory; magnetic circuits Résumé : The magnetic equivalent circuit (MEC) technique is a powerful analysis and design tool that combines relative accuracy with moderate computational effort. In this paper, a nodal-based MEC formulation and a mesh-based MEC formulation of a magnetic system are compared. The Newton-Raphson algorithm is used to solve the algebraic system, and to draw conclusions about the computational efficiency of the two formulations under linear and nonlinear operation. Although the two formulations exhibit similar performance under linear operating conditions, the performance of the mesh-based model is significantly better than that of the nodal-based model under nonlinear operation. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957571&sortType%3Das [...] [article] A comparison of nodal- and mesh-based magnetic equivalent circuit models [texte imprimé] / Derbas, Hamza W., Auteur ; Williams, Joshua M., Auteur ; Koenig, Andreas C., Auteur . - 2009 . - pp. 388 - 396.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 388 - 396
Mots-clés : Newton-Raphson method; equivalent circuits; machine theory; magnetic circuits Résumé : The magnetic equivalent circuit (MEC) technique is a powerful analysis and design tool that combines relative accuracy with moderate computational effort. In this paper, a nodal-based MEC formulation and a mesh-based MEC formulation of a magnetic system are compared. The Newton-Raphson algorithm is used to solve the algebraic system, and to draw conclusions about the computational efficiency of the two formulations under linear and nonlinear operation. Although the two formulations exhibit similar performance under linear operating conditions, the performance of the mesh-based model is significantly better than that of the nodal-based model under nonlinear operation. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957571&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 397 - 405
Titre : 3-D magnetic equivalent circuit framework for modeling electromechanical devices Type de document : texte imprimé Auteurs : Amrhein, M., Auteur ; Krein, P.T., Auteur Année de publication : 2009 Article en page(s) : pp. 397 - 405 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : CAD; asynchronous machines; equivalent circuits; finite element analysis; inductors; lumped parameter networks; magnetic circuits Résumé : Magnetic equivalent circuits (MECs) are becoming an accepted alternative to electrical-equivalent lumped-parameter models and finite-element analysis (FEA) for simulating electromechanical devices. Their key advantages are moderate computational effort, reasonable accuracy, and flexibility in model size. MECs are easily extended into three dimensions. But despite the successful use of MEC as a modeling tool, a generalized 3-D formulation useable for a comprehensive computer-aided design tool has not yet emerged (unlike FEA, where general modeling tools are readily available). This paper discusses the framework of a 3-D MEC modeling approach, and presents the implementation of a variable-sized reluctance network distribution based on 3-D elements. Force calculation and modeling of moving objects are considered. Two experimental case studies, a soft-ferrite inductor and an induction machine, show promising results when compared to measurements and simulations of lumped parameter and FEA models. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957572&sortType%3Das [...] [article] 3-D magnetic equivalent circuit framework for modeling electromechanical devices [texte imprimé] / Amrhein, M., Auteur ; Krein, P.T., Auteur . - 2009 . - pp. 397 - 405.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 397 - 405
Mots-clés : CAD; asynchronous machines; equivalent circuits; finite element analysis; inductors; lumped parameter networks; magnetic circuits Résumé : Magnetic equivalent circuits (MECs) are becoming an accepted alternative to electrical-equivalent lumped-parameter models and finite-element analysis (FEA) for simulating electromechanical devices. Their key advantages are moderate computational effort, reasonable accuracy, and flexibility in model size. MECs are easily extended into three dimensions. But despite the successful use of MEC as a modeling tool, a generalized 3-D formulation useable for a comprehensive computer-aided design tool has not yet emerged (unlike FEA, where general modeling tools are readily available). This paper discusses the framework of a 3-D MEC modeling approach, and presents the implementation of a variable-sized reluctance network distribution based on 3-D elements. Force calculation and modeling of moving objects are considered. Two experimental case studies, a soft-ferrite inductor and an induction machine, show promising results when compared to measurements and simulations of lumped parameter and FEA models. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957572&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 406 - 414
Titre : Multivariable self-tuning control of a turbine generator system Type de document : texte imprimé Auteurs : Zachariah, K. J., Auteur ; Finch, John W., Auteur ; Mohammad Farsi, Auteur Année de publication : 2009 Article en page(s) : pp. 406 - 414 Note générale : energy energy Langues : Anglais (eng) Mots-clés : Predictive control; self-adjusting systems; turbogenerators; voltage regulators Résumé : Results from a collaborative research and development program devoted to turbine generator (TG) control are described. Digital self-tuning excitation controllers were designed for a generator during the initial phase of the project, with the design subsequently extended to cover multivariable control of the TG, which is the topic of this paper. Simulations and tests on a laboratory-scale machine have been accomplished successfully and a prototype multivariable self-tuning controller has been built. A set of typical results is given, covering responses to fault conditions of the power system. The multivariable self-tuning controller is shown to have good potential for commercial use for the TG. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957573&sortType%3Das [...] [article] Multivariable self-tuning control of a turbine generator system [texte imprimé] / Zachariah, K. J., Auteur ; Finch, John W., Auteur ; Mohammad Farsi, Auteur . - 2009 . - pp. 406 - 414.
energy energy
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 406 - 414
Mots-clés : Predictive control; self-adjusting systems; turbogenerators; voltage regulators Résumé : Results from a collaborative research and development program devoted to turbine generator (TG) control are described. Digital self-tuning excitation controllers were designed for a generator during the initial phase of the project, with the design subsequently extended to cover multivariable control of the TG, which is the topic of this paper. Simulations and tests on a laboratory-scale machine have been accomplished successfully and a prototype multivariable self-tuning controller has been built. A set of typical results is given, covering responses to fault conditions of the power system. The multivariable self-tuning controller is shown to have good potential for commercial use for the TG. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957573&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 415 - 422
Titre : Control of DFIG-based wind generation to improve interarea oscillation damping Type de document : texte imprimé Auteurs : Zhixin, Miao, Auteur ; Lingling Fan, Auteur ; Osborn, Dale, Auteur Année de publication : 2009 Article en page(s) : pp. 415 - 422 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Asynchronous generators; control system synthesis; damping; electric current control; feedback; machine vector control; oscillations; power convertors; power generation control; reactive power control; time-domain analysis; wind power plants Résumé : Power systems with high penetration of wind power usually require long-distance transmission to export wind power to the market. Interarea oscillation is an issue faced in long-distance transmission. Can wind generation based on doubly fed induction generator (DFIG) help to damp oscillations and how? In this paper, a control scheme is developed for the DFIG with rotor-side converter to damp interarea oscillations. The DFIG is modeled in MATLABreg/Simulink utilizing its vector control scheme feature, and inner current control and outer active/reactive power control loops are modeled and designed. A two-area system that suffers from poor interarea oscillation damping along with a wind farm in the area that exports power is investigated. A damping controller is designed and time-domain simulations are used to demonstrate the effectiveness of the controller. The major contributions of the paper are as follows: 1) built a wind farm interarea oscillation study system based on the classical two-area four-machine system, 2) established that in vector control scheme, active power modulation can best help to damp oscillations, 3) successfully designed a feedback controller using remote signals with good interarea oscillation observability. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957574&sortType%3Das [...] [article] Control of DFIG-based wind generation to improve interarea oscillation damping [texte imprimé] / Zhixin, Miao, Auteur ; Lingling Fan, Auteur ; Osborn, Dale, Auteur . - 2009 . - pp. 415 - 422.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 415 - 422
Mots-clés : Asynchronous generators; control system synthesis; damping; electric current control; feedback; machine vector control; oscillations; power convertors; power generation control; reactive power control; time-domain analysis; wind power plants Résumé : Power systems with high penetration of wind power usually require long-distance transmission to export wind power to the market. Interarea oscillation is an issue faced in long-distance transmission. Can wind generation based on doubly fed induction generator (DFIG) help to damp oscillations and how? In this paper, a control scheme is developed for the DFIG with rotor-side converter to damp interarea oscillations. The DFIG is modeled in MATLABreg/Simulink utilizing its vector control scheme feature, and inner current control and outer active/reactive power control loops are modeled and designed. A two-area system that suffers from poor interarea oscillation damping along with a wind farm in the area that exports power is investigated. A damping controller is designed and time-domain simulations are used to demonstrate the effectiveness of the controller. The major contributions of the paper are as follows: 1) built a wind farm interarea oscillation study system based on the classical two-area four-machine system, 2) established that in vector control scheme, active power modulation can best help to damp oscillations, 3) successfully designed a feedback controller using remote signals with good interarea oscillation observability. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957574&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 423 - 430
Titre : Step-response model development for dynamic matrix control of a drum-type boiler–turbine system Type de document : texte imprimé Auteurs : Un-Chul Moon, Auteur ; Lee, Kwang Y., Auteur Année de publication : 2009 Article en page(s) : pp. 423 - 430 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : MIMO systems; boilers; nonlinear control systems; predictive control; steam turbines; step response Résumé : This paper presents the application of dynamic matrix control (DMC) to a drum-type boiler-turbine system. Two types of step-response models for DMC are investigated in designing the DMC; one is developed with the linearization of the nonlinear plant model and the other is developed with the process step-response data. Then, the control performances of the DMC based on both types of models are evaluated. Because of severe nonlinearity of drum water-level dynamics, it is observed that the simulation with the step-response model based on the test data shows satisfactory results, while the linearized model is not suitable for controller design of the drum-type boiler-turbine system. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957575&sortType%3Das [...] [article] Step-response model development for dynamic matrix control of a drum-type boiler–turbine system [texte imprimé] / Un-Chul Moon, Auteur ; Lee, Kwang Y., Auteur . - 2009 . - pp. 423 - 430.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 423 - 430
Mots-clés : MIMO systems; boilers; nonlinear control systems; predictive control; steam turbines; step response Résumé : This paper presents the application of dynamic matrix control (DMC) to a drum-type boiler-turbine system. Two types of step-response models for DMC are investigated in designing the DMC; one is developed with the linearization of the nonlinear plant model and the other is developed with the process step-response data. Then, the control performances of the DMC based on both types of models are evaluated. Because of severe nonlinearity of drum water-level dynamics, it is observed that the simulation with the step-response model based on the test data shows satisfactory results, while the linearized model is not suitable for controller design of the drum-type boiler-turbine system. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957575&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 431 - 441
Titre : Fault detection and diagnosis in a set “inverter–induction machine” through multidimensional membership function and pattern recognition Type de document : texte imprimé Auteurs : Ondel, Olivier, Auteur ; Clerc, Guy, Auteur ; Boutleux, Emmanuel, Auteur Année de publication : 2009 Article en page(s) : pp. 431 - 441 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Asynchronous machines; electric drives; fault diagnosis; pattern recognition Résumé : Nowadays, electrical drives generally associate inverter and induction machine. Thus, these two elements must be taken into account in order to provide a relevant diagnosis of these electrical systems. In this context, the paper presents a diagnosis method based on a multidimensional function and pattern recognition (PR). Traditional formalism of the PR method has been extended with some improvements such as the automatic choice of the feature space dimension or a ldquononexclusiverdquo decision rule based on the k-nearest neighbors. Thus, we introduce a new membership function, which takes into account the number of nearest neighbors as well as the distance from these neighbors with the sample to be classified. This approach is illustrated on a 5.5 kW inverter-fed asynchronous motor, in order to detect supply and motor faults. In this application, diagnostic features are only extracted from electrical measurements. Experimental results prove the efficiency of our diagnosis method. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4510860&sortType%3Das [...] [article] Fault detection and diagnosis in a set “inverter–induction machine” through multidimensional membership function and pattern recognition [texte imprimé] / Ondel, Olivier, Auteur ; Clerc, Guy, Auteur ; Boutleux, Emmanuel, Auteur . - 2009 . - pp. 431 - 441.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 431 - 441
Mots-clés : Asynchronous machines; electric drives; fault diagnosis; pattern recognition Résumé : Nowadays, electrical drives generally associate inverter and induction machine. Thus, these two elements must be taken into account in order to provide a relevant diagnosis of these electrical systems. In this context, the paper presents a diagnosis method based on a multidimensional function and pattern recognition (PR). Traditional formalism of the PR method has been extended with some improvements such as the automatic choice of the feature space dimension or a ldquononexclusiverdquo decision rule based on the k-nearest neighbors. Thus, we introduce a new membership function, which takes into account the number of nearest neighbors as well as the distance from these neighbors with the sample to be classified. This approach is illustrated on a 5.5 kW inverter-fed asynchronous motor, in order to detect supply and motor faults. In this application, diagnostic features are only extracted from electrical measurements. Experimental results prove the efficiency of our diagnosis method. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4510860&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 442 - 451
Titre : Harnessing high-altitude solar power Type de document : texte imprimé Auteurs : Aglietti, Guglielmo S., Auteur ; Redi, Stefano, Auteur ; Tatnall, Adrian R., Auteur Année de publication : 2009 Article en page(s) : pp. 442 - 451 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : High altitude stratospheric platforms; photovoltaic power systems; solar power satellites; solar power stations Résumé : As an intermediate solution between Glaser's satellite solar power (SSP) and ground-based photovoltaic (PV) panels, this paper examines the collection of solar energy using a high-altitude aerostatic platform. A procedure to calculate the irradiance in the medium/high troposphere, based on experimental data, is described. The results show that here a PV system could collect about four to six times the energy collected by a typical U.K.-based ground installation, and between one-third and half of the total energy the same system would collect if supported by a geostationary satellite (SSP). The concept of the aerostat for solar power generation is then briefly described together with the equations that link its main engineering parameters/variables. A preliminary sizing of a facility stationed at 6 km altitude and its costing, based on realistic values of the input engineering parameters, is then presented. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957576&sortType%3Das [...] [article] Harnessing high-altitude solar power [texte imprimé] / Aglietti, Guglielmo S., Auteur ; Redi, Stefano, Auteur ; Tatnall, Adrian R., Auteur . - 2009 . - pp. 442 - 451.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 442 - 451
Mots-clés : High altitude stratospheric platforms; photovoltaic power systems; solar power satellites; solar power stations Résumé : As an intermediate solution between Glaser's satellite solar power (SSP) and ground-based photovoltaic (PV) panels, this paper examines the collection of solar energy using a high-altitude aerostatic platform. A procedure to calculate the irradiance in the medium/high troposphere, based on experimental data, is described. The results show that here a PV system could collect about four to six times the energy collected by a typical U.K.-based ground installation, and between one-third and half of the total energy the same system would collect if supported by a geostationary satellite (SSP). The concept of the aerostat for solar power generation is then briefly described together with the equations that link its main engineering parameters/variables. A preliminary sizing of a facility stationed at 6 km altitude and its costing, based on realistic values of the input engineering parameters, is then presented. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957576&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 452 - 458
Titre : An experimental study and nonlinear modeling of discharge I–V behavior of valve-regulated lead–acid batteries Type de document : texte imprimé Auteurs : Shuo, Tian, Auteur ; Munan, Hong, Auteur ; Minggao, Ouyang, Auteur Année de publication : 2009 Article en page(s) : pp. 452 - 458 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Hybrid electric vehicles; lead acid batteries; regression analysis Résumé : Valve-regulated lead-acid battery continues to be studied in some cost-sensitive applications, such as microhybrid electric vehicle and scooters. A dynamic battery I -V model is needed for system design, simulation, and real-time control purposes. Battery discharging behavior is one of the most important parts of the model. By reviewing previous studies, the authors find that there is a contradiction between the linear and nonlinear I-V behaviors, and this serves as a motivation for the current experimental study. Through regression analysis of experimental data, the nonlinear behavior is verified and a nonlinear dynamic Thevenin model is developed. The model is validated by voltage response tests with multistep current profiles as model input. The calculated voltage response results from the model fit the test results well. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4752796&sortType%3Das [...] [article] An experimental study and nonlinear modeling of discharge I–V behavior of valve-regulated lead–acid batteries [texte imprimé] / Shuo, Tian, Auteur ; Munan, Hong, Auteur ; Minggao, Ouyang, Auteur . - 2009 . - pp. 452 - 458.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 452 - 458
Mots-clés : Hybrid electric vehicles; lead acid batteries; regression analysis Résumé : Valve-regulated lead-acid battery continues to be studied in some cost-sensitive applications, such as microhybrid electric vehicle and scooters. A dynamic battery I -V model is needed for system design, simulation, and real-time control purposes. Battery discharging behavior is one of the most important parts of the model. By reviewing previous studies, the authors find that there is a contradiction between the linear and nonlinear I-V behaviors, and this serves as a motivation for the current experimental study. Through regression analysis of experimental data, the nonlinear behavior is verified and a nonlinear dynamic Thevenin model is developed. The model is validated by voltage response tests with multistep current profiles as model input. The calculated voltage response results from the model fit the test results well. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4752796&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 459 - 464
Titre : Estimation of energy yield from wind farms using artificial neural networks Type de document : texte imprimé Auteurs : Mabel, M. Carolin, Auteur ; E. Fernández, Auteur Année de publication : 2009 Article en page(s) : pp. 459 - 464 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Mathematics computing; mean square error methods; neural nets; power engineering computing; wind power plants Résumé : This paper uses the data from seven wind farms at Muppandal, Tamil Nadu, India, collected for three years from April 2002 to March 2005 for the estimation of energy yield from wind farms. The model is developed with the help of neural network methodology, and it involves three input variables-wind speed, relative humidity, and generation hours-and one output variable, which give the energy output from wind farms. The modeling is done using MATLAB software. The most appropriate neural network configuration after trial and error is found to be 3-5-1 (3 input layer neurons, 5 hidden layer neurons, 1 output layer neuron). The mean square error for the estimated values with respect to the measured data is 7.6times10-3. The results demonstrate that this work is an efficient energy yield estimation tool for wind farms. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4738388&sortType%3Das [...] [article] Estimation of energy yield from wind farms using artificial neural networks [texte imprimé] / Mabel, M. Carolin, Auteur ; E. Fernández, Auteur . - 2009 . - pp. 459 - 464.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 459 - 464
Mots-clés : Mathematics computing; mean square error methods; neural nets; power engineering computing; wind power plants Résumé : This paper uses the data from seven wind farms at Muppandal, Tamil Nadu, India, collected for three years from April 2002 to March 2005 for the estimation of energy yield from wind farms. The model is developed with the help of neural network methodology, and it involves three input variables-wind speed, relative humidity, and generation hours-and one output variable, which give the energy output from wind farms. The modeling is done using MATLAB software. The most appropriate neural network configuration after trial and error is found to be 3-5-1 (3 input layer neurons, 5 hidden layer neurons, 1 output layer neuron). The mean square error for the estimated values with respect to the measured data is 7.6times10-3. The results demonstrate that this work is an efficient energy yield estimation tool for wind farms. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4738388&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 465 - 473
Titre : Ramp-rate control of photovoltaic generator with electric double-layer capacitor Type de document : texte imprimé Auteurs : Nagaoka, Naoto, Auteur ; Satoh, Hiroyuki, Auteur ; Takayama, Satoshi, Auteur Année de publication : 2009 Article en page(s) : pp. 465 - 473 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Electrolytic capacitors; photovoltaic power systems; power generation control Résumé : This paper describes ramp rate control of a photovoltaic (PV) generator with an electric double-layer capacitor. The capacitor absorbs rapid fluctuations of PV generation, and allows the generator to change its output at a limited ramp rate. The output is mainly determined by a moving average of the PV generation, but the capacitor voltage is also counted to keep the voltage at a specified value, and accordingly, to make the capacitor small. An expression for the capacitor size is derived. The feedback gain of the capacitor voltage is also examined to maintain enough energy storage in the capacitor. Some experiments are executed to demonstrate and validate the proposed method. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957577&sortType%3Das [...] [article] Ramp-rate control of photovoltaic generator with electric double-layer capacitor [texte imprimé] / Nagaoka, Naoto, Auteur ; Satoh, Hiroyuki, Auteur ; Takayama, Satoshi, Auteur . - 2009 . - pp. 465 - 473.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 465 - 473
Mots-clés : Electrolytic capacitors; photovoltaic power systems; power generation control Résumé : This paper describes ramp rate control of a photovoltaic (PV) generator with an electric double-layer capacitor. The capacitor absorbs rapid fluctuations of PV generation, and allows the generator to change its output at a limited ramp rate. The output is mainly determined by a moving average of the PV generation, but the capacitor voltage is also counted to keep the voltage at a specified value, and accordingly, to make the capacitor small. An expression for the capacitor size is derived. The feedback gain of the capacitor voltage is also examined to maintain enough energy storage in the capacitor. Some experiments are executed to demonstrate and validate the proposed method. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957577&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 474 - 482
Titre : Forecasting the wind generation using a two-stage network based on meteorological information Type de document : texte imprimé Auteurs : Shu, Fan, Auteur ; Liao, James R., Auteur ; Yokoyama, Ryuichi, Auteur Année de publication : 2009 Article en page(s) : pp. 474 - 482 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Bayes methods; forecasting theory; meteorology; pattern clustering; power generation scheduling; power markets; regression analysis; wind power; wind power plants Résumé : This paper proposes a practical and effective model for the generation forecasting of a wind farm with an emphasis on its scheduling and trading in a wholesale electricity market. A novel forecasting model is developed based on indepth investigations of meteorological information. This model adopts a two-stage hybrid network with Bayesian clustering by dynamics and support vector regression. The proposed structure is robust with different input data types and can deal with the nonstationarity of wind speed and generation series well. Once the network is trained, we can straightforward predict the 48-h ahead wind power generation. To demonstrate the effectiveness, the model is applied and tested on a 74-MW wind farm located in the southwest Oklahoma of the United States. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4757294&sortType%3Das [...] [article] Forecasting the wind generation using a two-stage network based on meteorological information [texte imprimé] / Shu, Fan, Auteur ; Liao, James R., Auteur ; Yokoyama, Ryuichi, Auteur . - 2009 . - pp. 474 - 482.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 474 - 482
Mots-clés : Bayes methods; forecasting theory; meteorology; pattern clustering; power generation scheduling; power markets; regression analysis; wind power; wind power plants Résumé : This paper proposes a practical and effective model for the generation forecasting of a wind farm with an emphasis on its scheduling and trading in a wholesale electricity market. A novel forecasting model is developed based on indepth investigations of meteorological information. This model adopts a two-stage hybrid network with Bayesian clustering by dynamics and support vector regression. The proposed structure is robust with different input data types and can deal with the nonstationarity of wind speed and generation series well. Once the network is trained, we can straightforward predict the 48-h ahead wind power generation. To demonstrate the effectiveness, the model is applied and tested on a 74-MW wind farm located in the southwest Oklahoma of the United States. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4757294&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 483 - 492
Titre : PWM energy converters : fractal method of dynamics forecasting in practical application Type de document : texte imprimé Auteurs : Kolokolov, Yury V., Auteur ; Monovskaya, Anna V., Auteur ; Adjallah, Kondo Hloindo, Auteur Année de publication : 2009 Article en page(s) : pp. 483 - 492 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : PWM power convertors; chaos; fractals Résumé : A fractal method of dynamics forecasting is investigated from the viewpoint of practical application regarding pulsewidth modulation (PWM) energy converters (PECs). The method realizes the idea of PEC state estimation relative to the preliminary formed domains of periodic processes. With this purpose, a special space ldquois designedrdquo into which the periodic process domains are mapped from the parametrical space and transient phase trajectories-from the phase space. Mapping is provided with use of geometrical interpretation of fractal regularities that exist in the structures of both periodic process and transient phase trajectories. Computational and experimental investigations of the fractal method efficiency are carried out within the bounds of the scenario of dynamics evolution toward chaos through period doubling. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957578&sortType%3Das [...] [article] PWM energy converters : fractal method of dynamics forecasting in practical application [texte imprimé] / Kolokolov, Yury V., Auteur ; Monovskaya, Anna V., Auteur ; Adjallah, Kondo Hloindo, Auteur . - 2009 . - pp. 483 - 492.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 483 - 492
Mots-clés : PWM power convertors; chaos; fractals Résumé : A fractal method of dynamics forecasting is investigated from the viewpoint of practical application regarding pulsewidth modulation (PWM) energy converters (PECs). The method realizes the idea of PEC state estimation relative to the preliminary formed domains of periodic processes. With this purpose, a special space ldquois designedrdquo into which the periodic process domains are mapped from the parametrical space and transient phase trajectories-from the phase space. Mapping is provided with use of geometrical interpretation of fractal regularities that exist in the structures of both periodic process and transient phase trajectories. Computational and experimental investigations of the fractal method efficiency are carried out within the bounds of the scenario of dynamics evolution toward chaos through period doubling. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957578&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 493 - 503
Titre : Coordinated reactive power control of a large wind farm and a STATCOM using heuristic dynamic programming Type de document : texte imprimé Auteurs : Qiao, Wei, Auteur ; Ronald G. Harley, Auteur ; Ganesh Kumar Venayagamoorthy, Auteur Année de publication : 2009 Article en page(s) : pp. 493 - 503 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Asynchronous generators; dynamic programming; neurocontrollers; power system CAD; radial basis function networks; reactive power control; static VAr compensators; wind power plants Résumé : A novel interface neurocontroller (INC) is proposed for the coordinated reactive power control between a large wind farm equipped with doubly fed induction generators (DFIGs) and a static synchronous compensator (STATCOM). The heuristic dynamic programming (HDP) technique and radial basis function neural networks (RBFNNs) are used to design this INC. It effectively reduces the level of voltage sags as well as the over-currents in the DFIG rotor circuit during grid faults, and therefore, significantly enhances the fault ride-through capability of the wind farm. The INC also acts as a coordinated external damping controller for the wind farm and the STATCOM, and therefore, improves power oscillation damping of the system after grid faults. Simulation studies are carried out in PSCAD/EMTDC and the results are presented to verify the proposed INC. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4749293&sortType%3Das [...] [article] Coordinated reactive power control of a large wind farm and a STATCOM using heuristic dynamic programming [texte imprimé] / Qiao, Wei, Auteur ; Ronald G. Harley, Auteur ; Ganesh Kumar Venayagamoorthy, Auteur . - 2009 . - pp. 493 - 503.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 493 - 503
Mots-clés : Asynchronous generators; dynamic programming; neurocontrollers; power system CAD; radial basis function networks; reactive power control; static VAr compensators; wind power plants Résumé : A novel interface neurocontroller (INC) is proposed for the coordinated reactive power control between a large wind farm equipped with doubly fed induction generators (DFIGs) and a static synchronous compensator (STATCOM). The heuristic dynamic programming (HDP) technique and radial basis function neural networks (RBFNNs) are used to design this INC. It effectively reduces the level of voltage sags as well as the over-currents in the DFIG rotor circuit during grid faults, and therefore, significantly enhances the fault ride-through capability of the wind farm. The INC also acts as a coordinated external damping controller for the wind farm and the STATCOM, and therefore, improves power oscillation damping of the system after grid faults. Simulation studies are carried out in PSCAD/EMTDC and the results are presented to verify the proposed INC. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4749293&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 504 - 510
Titre : A novel scheme to connect wind turbines to the power grid Type de document : texte imprimé Auteurs : Joshi, Nitin, Auteur ; Mohan, Ned, Auteur Année de publication : 2009 Article en page(s) : pp. 504 - 510 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Asynchronous generators; compensation; fault currents; power generation faults; power grids; wind turbines Résumé : In this paper, a new scheme is proposed to connect wind turbines to the power grid. This scheme helps in limiting the fault currents as well as in voltage unbalance compensation. Voltage is injected in series with the transmission line to limit the fault currents as well as to balance the voltages. This scheme allows wind turbines to remain synchronized to the grid during faults or during low voltages and is useful for doubly fed as well as squirrel cage induction generators. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957579&sortType%3Das [...] [article] A novel scheme to connect wind turbines to the power grid [texte imprimé] / Joshi, Nitin, Auteur ; Mohan, Ned, Auteur . - 2009 . - pp. 504 - 510.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 504 - 510
Mots-clés : Asynchronous generators; compensation; fault currents; power generation faults; power grids; wind turbines Résumé : In this paper, a new scheme is proposed to connect wind turbines to the power grid. This scheme helps in limiting the fault currents as well as in voltage unbalance compensation. Voltage is injected in series with the transmission line to limit the fault currents as well as to balance the voltages. This scheme allows wind turbines to remain synchronized to the grid during faults or during low voltages and is useful for doubly fed as well as squirrel cage induction generators. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957579&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 511 - 519
Titre : Techno-economic optimum sizing of a stand-alone solar photovoltaic system Type de document : texte imprimé Auteurs : Kolhe, Mohan, Auteur Année de publication : 2009 Article en page(s) : pp. 511 - 519 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Cells (electric); photovoltaic power systems; power generation economics; solar radiation Résumé : The techno-economic optimum sizing of a stand-alone photovoltaic (PV) system is a basic requirement for its proliferation. One of the primary concerns in designing a stand-alone PV system is the determination of an optimum relationship between the PV array and storage battery capacity to supply the required energy at a specified energy load fraction. In this paper, a complete analytical methodology has been presented for that. The solar radiation utilizability concept and the monthly average daily PV array efficiency have been used to estimate the performance of a stand-alone PV system and hence for the designing. The techno-economic optimization of a PV system has been done by using levelized energy cost computation based on the total number of battery replacements (brp's) through battery life-cycle model by using the solar radiation utilizability concept over the life period of the system. It has been found that energy load fractions as well as the number of brp's have a significant impact on the selection of optimum sizing of a stand-alone PV system. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957580&sortType%3Das [...] [article] Techno-economic optimum sizing of a stand-alone solar photovoltaic system [texte imprimé] / Kolhe, Mohan, Auteur . - 2009 . - pp. 511 - 519.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 511 - 519
Mots-clés : Cells (electric); photovoltaic power systems; power generation economics; solar radiation Résumé : The techno-economic optimum sizing of a stand-alone photovoltaic (PV) system is a basic requirement for its proliferation. One of the primary concerns in designing a stand-alone PV system is the determination of an optimum relationship between the PV array and storage battery capacity to supply the required energy at a specified energy load fraction. In this paper, a complete analytical methodology has been presented for that. The solar radiation utilizability concept and the monthly average daily PV array efficiency have been used to estimate the performance of a stand-alone PV system and hence for the designing. The techno-economic optimization of a PV system has been done by using levelized energy cost computation based on the total number of battery replacements (brp's) through battery life-cycle model by using the solar radiation utilizability concept over the life period of the system. It has been found that energy load fractions as well as the number of brp's have a significant impact on the selection of optimum sizing of a stand-alone PV system. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957580&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 520 - 528
Titre : A control method for small utility connected large PV system to reduce frequency deviation using a minimal-order observer Type de document : texte imprimé Auteurs : Senjyu, Tomonobu, Auteur ; Datta, Manoj, Auteur ; Yona, Atsushi, Auteur Année de publication : 2009 Article en page(s) : pp. 520 - 528 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Low-pass filters; observers; photovoltaic power systems; power filters; power generation control; reduced order systems Résumé : In this paper, a minimal-order observer-based control method is proposed for small power utility connected photovoltaic (PV) systems. In the proposed method, the PV power is controlled according to load variation to minimize the frequency deviation. Load power and diesel power are estimated successfully by a minimal-order observer. From the estimated load power, load variation index is calculated. A second-order low-pass filter is used to produce PV base power from available maximum PV power. Then, the PV base power is added with the load variation index to generate the command PV power. The proposed method is compared with the method where maximum power point tracking control is used to produce the command PV power. From simulation results, it has been found that the proposed method is effective to reduce the frequency deviation of the utility and also delivers PV power near maximum PV power. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957581&sortType%3Das [...] [article] A control method for small utility connected large PV system to reduce frequency deviation using a minimal-order observer [texte imprimé] / Senjyu, Tomonobu, Auteur ; Datta, Manoj, Auteur ; Yona, Atsushi, Auteur . - 2009 . - pp. 520 - 528.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 520 - 528
Mots-clés : Low-pass filters; observers; photovoltaic power systems; power filters; power generation control; reduced order systems Résumé : In this paper, a minimal-order observer-based control method is proposed for small power utility connected photovoltaic (PV) systems. In the proposed method, the PV power is controlled according to load variation to minimize the frequency deviation. Load power and diesel power are estimated successfully by a minimal-order observer. From the estimated load power, load variation index is calculated. A second-order low-pass filter is used to produce PV base power from available maximum PV power. Then, the PV base power is added with the load variation index to generate the command PV power. The proposed method is compared with the method where maximum power point tracking control is used to produce the command PV power. From simulation results, it has been found that the proposed method is effective to reduce the frequency deviation of the utility and also delivers PV power near maximum PV power. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957581&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 529 - 538
Titre : Modeling and performance analysis of a microturbine as a distributed energy resource Type de document : texte imprimé Auteurs : Saha, A. K., Auteur ; Chowdhury, S., Auteur ; Chowdhury, S. P., Auteur Année de publication : 2009 Article en page(s) : pp. 529 - 538 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Distribution networks; power system simulation; synchronous generators; turbogenerators; velocity control Résumé : This paper presents modeling, simulation, and analysis of load following behavior of a microturbine (MT) as a distributed energy resource (DER). The MT-generator (MTG) system consists of the MT coupled to a synchronous generator. Simulation is done in MATLAB for different loading conditions under islanded and grid-connected modes. The MTG model also incorporates a speed controller for maintaining constant speed at variable loads. Performance is studied both with and without the speed controller. The paper also compares the simulation results with already reported results and with real life load following data for a typical islanded MT of similar rating. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957582&sortType%3Das [...] [article] Modeling and performance analysis of a microturbine as a distributed energy resource [texte imprimé] / Saha, A. K., Auteur ; Chowdhury, S., Auteur ; Chowdhury, S. P., Auteur . - 2009 . - pp. 529 - 538.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 529 - 538
Mots-clés : Distribution networks; power system simulation; synchronous generators; turbogenerators; velocity control Résumé : This paper presents modeling, simulation, and analysis of load following behavior of a microturbine (MT) as a distributed energy resource (DER). The MT-generator (MTG) system consists of the MT coupled to a synchronous generator. Simulation is done in MATLAB for different loading conditions under islanded and grid-connected modes. The MTG model also incorporates a speed controller for maintaining constant speed at variable loads. Performance is studied both with and without the speed controller. The paper also compares the simulation results with already reported results and with real life load following data for a typical islanded MT of similar rating. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957582&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 539 - 547
Titre : A knowledge-based approach for control of two-level energy storage for wind energy systems Type de document : texte imprimé Auteurs : Abbey, Chad, Auteur ; Strunz, Kai, Auteur Année de publication : 2009 Article en page(s) : pp. 539 - 547 Note générale : energy cnversion Langues : Anglais (eng) Mots-clés : Energy storage; knowledge based systems; power engineering computing; power system control; wind power Résumé : The percentage of wind energy in a generation mix will ultimately be limited by its intermittency and uncertainty as a source of power. However, the pairing of wind with energy storage systems could be utilized in order to produce dispatchable power. This paper considers a two-level energy storage system for application to wind energy systems. A knowledge-based management algorithm is proposed in order to schedule the power from the two levels. The system is tested for two possible power systems applications and its performance is compared with that of an alternate scheduling approach. Results demonstrate that the proposed algorithm requires a lower storage rating due to its ability to better coordinate operation of the two devices. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4738387&sortType%3Das [...] [article] A knowledge-based approach for control of two-level energy storage for wind energy systems [texte imprimé] / Abbey, Chad, Auteur ; Strunz, Kai, Auteur . - 2009 . - pp. 539 - 547.
energy cnversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 539 - 547
Mots-clés : Energy storage; knowledge based systems; power engineering computing; power system control; wind power Résumé : The percentage of wind energy in a generation mix will ultimately be limited by its intermittency and uncertainty as a source of power. However, the pairing of wind with energy storage systems could be utilized in order to produce dispatchable power. This paper considers a two-level energy storage system for application to wind energy systems. A knowledge-based management algorithm is proposed in order to schedule the power from the two levels. The system is tested for two possible power systems applications and its performance is compared with that of an alternate scheduling approach. Results demonstrate that the proposed algorithm requires a lower storage rating due to its ability to better coordinate operation of the two devices. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4738387&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 548 - 550
Titre : Annual wind speed estimation utilizing constrained grey predictor Type de document : texte imprimé Auteurs : Atwa, Y. M., Auteur ; El-Saadany, E. F., Auteur Année de publication : 2009 Article en page(s) : pp. 548 - 550 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Grey systems; wind power Résumé : In this letter, a novel technique for annual wind speed estimation based on constrained Grey predictor is presented. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957583&sortType%3Das [...] [article] Annual wind speed estimation utilizing constrained grey predictor [texte imprimé] / Atwa, Y. M., Auteur ; El-Saadany, E. F., Auteur . - 2009 . - pp. 548 - 550.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 548 - 550
Mots-clés : Grey systems; wind power Résumé : In this letter, a novel technique for annual wind speed estimation based on constrained Grey predictor is presented. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957583&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 551 - 553
Titre : Enhancement of matching turbine generators with wind regime using capacity factor curves strategy Type de document : texte imprimé Auteurs : Shyh-Jier, Huang, Auteur ; Hsing-Ho Wan, Auteur Année de publication : 2009 Article en page(s) : pp. 551 - 553 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Turbogenerators; wind turbines Résumé : This letter presents an enhanced strategy for site-matching of wind turbine generators using capacity factor curves, which can be employed to determine the optimum turbine rated wind speed that yields a maximum energy at a specific site. This strategy unifies several results from the literature and enables useful extensions and generalizations. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957584&sortType%3Das [...] [article] Enhancement of matching turbine generators with wind regime using capacity factor curves strategy [texte imprimé] / Shyh-Jier, Huang, Auteur ; Hsing-Ho Wan, Auteur . - 2009 . - pp. 551 - 553.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 551 - 553
Mots-clés : Turbogenerators; wind turbines Résumé : This letter presents an enhanced strategy for site-matching of wind turbine generators using capacity factor curves, which can be employed to determine the optimum turbine rated wind speed that yields a maximum energy at a specific site. This strategy unifies several results from the literature and enables useful extensions and generalizations. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957584&sortType%3Das [...]
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