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IEEE Transactions on energy conversion |
Dépouillements
Ajouter le résultat dans votre panierVariable frequency transformer / Merkhouf, A. in IEEE transactions on energy conversion, Vol. 23 n°4 (Décembre 2008)
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 989 - 996
Titre : Variable frequency transformer : concept and electromagnetic design evaluation Type de document : texte imprimé Auteurs : Merkhouf, A., Auteur ; Doyon, P., Auteur ; Upadhyay, S., Auteur Année de publication : 2009 Article en page(s) : pp. 989 - 996 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Asynchronous machines; power transformers; rotors; stators Résumé : Variable frequency transformer (VFT) is a controllable bidirectional transmission device that can transfer power between asynchronous networks. The construction of VFT is similar to conventional asynchronous machines, where the two separate electrical networks are connected to the stator and rotor respectively. Electrical power is exchanged between the two networks by magnetic coupling through the air gap of the VFT. This paper describes the basic concept of the VFT and presents an overview of the mechanical and electromagnetic design of a unit having four poles and rated at 100 MW, 17 kV/17 kV, 60 Hz. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675805&sortType%3Das [...] [article] Variable frequency transformer : concept and electromagnetic design evaluation [texte imprimé] / Merkhouf, A., Auteur ; Doyon, P., Auteur ; Upadhyay, S., Auteur . - 2009 . - pp. 989 - 996.
Energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 989 - 996
Mots-clés : Asynchronous machines; power transformers; rotors; stators Résumé : Variable frequency transformer (VFT) is a controllable bidirectional transmission device that can transfer power between asynchronous networks. The construction of VFT is similar to conventional asynchronous machines, where the two separate electrical networks are connected to the stator and rotor respectively. Electrical power is exchanged between the two networks by magnetic coupling through the air gap of the VFT. This paper describes the basic concept of the VFT and presents an overview of the mechanical and electromagnetic design of a unit having four poles and rated at 100 MW, 17 kV/17 kV, 60 Hz. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675805&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 997 - 1004
Titre : Determination of NEMA design induction motor parameters from manufacturer data Type de document : texte imprimé Auteurs : Haque, M.H., Auteur Année de publication : 2009 Article en page(s) : pp. 997 - 1004 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Equivalent circuits; induction motors; least squares approximations; nonlinear equations; parameter estimation; rotors; slip (asynchronous machines); torque Résumé : This paper proposes a simple method of determining the equivalent circuit parameters of National Electrical Manufacturers Association (NEMA) design A and B types of induction motors from standard manufacturer data such as rated output power, starting torque, breakdown torque, and efficiency and power factor at rated output power. A set of nonlinear equations for various quantities is first derived from the equivalent circuit with a single-cage rotor model, and then, equate to the corresponding actual values supplied by the manufacturer. These equations are then solved using a least-squares based algorithm to determine the motor parameters. The rotor parameters are considered as slip dependent to predict the starting torque of the motor and that requires refining the breakdown torque equation as well as the slip at which the breakdown torque occurs. The proposed method of determining the motor parameters is then tested on more than 300 large-size HV induction motors. The effectiveness of the proposed method is evaluated by calculating various external quantities of the motors through the estimated parameters and comparing them with the corresponding actual values supplied by the manufacturer. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675802&sortType%3Das [...] [article] Determination of NEMA design induction motor parameters from manufacturer data [texte imprimé] / Haque, M.H., Auteur . - 2009 . - pp. 997 - 1004.
Energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 997 - 1004
Mots-clés : Equivalent circuits; induction motors; least squares approximations; nonlinear equations; parameter estimation; rotors; slip (asynchronous machines); torque Résumé : This paper proposes a simple method of determining the equivalent circuit parameters of National Electrical Manufacturers Association (NEMA) design A and B types of induction motors from standard manufacturer data such as rated output power, starting torque, breakdown torque, and efficiency and power factor at rated output power. A set of nonlinear equations for various quantities is first derived from the equivalent circuit with a single-cage rotor model, and then, equate to the corresponding actual values supplied by the manufacturer. These equations are then solved using a least-squares based algorithm to determine the motor parameters. The rotor parameters are considered as slip dependent to predict the starting torque of the motor and that requires refining the breakdown torque equation as well as the slip at which the breakdown torque occurs. The proposed method of determining the motor parameters is then tested on more than 300 large-size HV induction motors. The effectiveness of the proposed method is evaluated by calculating various external quantities of the motors through the estimated parameters and comparing them with the corresponding actual values supplied by the manufacturer. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675802&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1005 - 1014
Titre : A reconfigurable motor for experimental emulation of stator winding interturn and broken bar faults in polyphase induction machines Type de document : texte imprimé Auteurs : Yeh, Chia-Chou, Auteur ; Sizov, G.Y., Auteur ; Sayed-Ahmed, A., Auteur Année de publication : 2009 Article en page(s) : pp. 1005 - 1014 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Fault diagnosis; induction motors; machine testing; rotors; stators Résumé : The benefits and drawbacks of a 5-hp reconfigurable induction motor, which was designed for experimental emulation of stator winding interturn and broken rotor bar faults, are presented in this paper. It was perceived that this motor had the potential of quick and easy reconfiguration to produce the desired stator and rotor faults in a variety of different fault combinations. Hence, this motor was anticipated to make a useful test bed for evaluation of the efficacy of existing and new motor fault diagnostics techniques and not the study of insulation failure mechanisms. Accordingly, it was anticipated that this reconfigurable motor would eliminate the need to permanently destroy machine components such as stator windings or rotor bars when acquiring data from a faulty machine for fault diagnostic purposes. Experimental results under healthy and various faulty conditions are presented in this paper, including issues associated with rotor bar-end ring contact resistances that showed the drawbacks of this motor in so far as emulation of rotor bar breakages. However, emulation of stator-turn fault scenarios was successfully accomplished. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675794&sortType%3Das [...] [article] A reconfigurable motor for experimental emulation of stator winding interturn and broken bar faults in polyphase induction machines [texte imprimé] / Yeh, Chia-Chou, Auteur ; Sizov, G.Y., Auteur ; Sayed-Ahmed, A., Auteur . - 2009 . - pp. 1005 - 1014.
Energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1005 - 1014
Mots-clés : Fault diagnosis; induction motors; machine testing; rotors; stators Résumé : The benefits and drawbacks of a 5-hp reconfigurable induction motor, which was designed for experimental emulation of stator winding interturn and broken rotor bar faults, are presented in this paper. It was perceived that this motor had the potential of quick and easy reconfiguration to produce the desired stator and rotor faults in a variety of different fault combinations. Hence, this motor was anticipated to make a useful test bed for evaluation of the efficacy of existing and new motor fault diagnostics techniques and not the study of insulation failure mechanisms. Accordingly, it was anticipated that this reconfigurable motor would eliminate the need to permanently destroy machine components such as stator windings or rotor bars when acquiring data from a faulty machine for fault diagnostic purposes. Experimental results under healthy and various faulty conditions are presented in this paper, including issues associated with rotor bar-end ring contact resistances that showed the drawbacks of this motor in so far as emulation of rotor bar breakages. However, emulation of stator-turn fault scenarios was successfully accomplished. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675794&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1015 - 1024
Titre : Development of a nonlinear and model-based online loss minimization control of an IM drive Type de document : texte imprimé Auteurs : Uddin, M.N., Auteur ; Sang Woo Nam, Auteur Année de publication : 2009 Article en page(s) : pp. 1015 - 1024 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Adaptive control; digital signal processing chips; induction motor drives; invertors; machine control; machine theory; minimisation; nonlinear control systems Résumé : Among the numerous loss minimization algorithms, a loss-model-based approach offers a fast response without torque pulsations. However, it requires the accurate loss model and the knowledge of the motor parameters. Therefore, a technical difficulty in deriving the loss-model-based controller (LMC) lies in the complexity of the full loss model and the online motor parameter adaptation. In an effort to overcome the drawbacks of LMC, this paper presents a new strategy for inverter-fed induction motors drives aiming for both high efficiency and high dynamic performance. A new LMC incorporating the effect of the leakage inductance and an adaptive-backstepping-based nonlinear controller are designed and combined with each other. Thus, online parameter adaptation of LMC can be obtained with no extra effort. The proposed control scheme is implemented in real time using digital signal processor board DS 1104. The simulation and experimental results demonstrate the effectiveness of the proposed scheme. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675819&sortType%3Das [...] [article] Development of a nonlinear and model-based online loss minimization control of an IM drive [texte imprimé] / Uddin, M.N., Auteur ; Sang Woo Nam, Auteur . - 2009 . - pp. 1015 - 1024.
Energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1015 - 1024
Mots-clés : Adaptive control; digital signal processing chips; induction motor drives; invertors; machine control; machine theory; minimisation; nonlinear control systems Résumé : Among the numerous loss minimization algorithms, a loss-model-based approach offers a fast response without torque pulsations. However, it requires the accurate loss model and the knowledge of the motor parameters. Therefore, a technical difficulty in deriving the loss-model-based controller (LMC) lies in the complexity of the full loss model and the online motor parameter adaptation. In an effort to overcome the drawbacks of LMC, this paper presents a new strategy for inverter-fed induction motors drives aiming for both high efficiency and high dynamic performance. A new LMC incorporating the effect of the leakage inductance and an adaptive-backstepping-based nonlinear controller are designed and combined with each other. Thus, online parameter adaptation of LMC can be obtained with no extra effort. The proposed control scheme is implemented in real time using digital signal processor board DS 1104. The simulation and experimental results demonstrate the effectiveness of the proposed scheme. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675819&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1025 - 1035
Titre : An adaptive nonlinear controller for DFIM-based wind energy conversion systems Type de document : texte imprimé Auteurs : Mauricio, J.M., Auteur ; Leon, A. E., Auteur ; Gomez-Exposito, A., Auteur Année de publication : 2009 Article en page(s) : pp. 1025 - 1035 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Adaptive control; asynchronous machines; feedback; linearisation techniques; machine control; nonlinear control systems; observers; parameter estimation; uncertain systems; wind power Résumé : An adaptive nonlinear controller for wind energy doubly fed induction machines is introduced in this paper. The proposed controller is based on the feedback linearization technique and includes a disturbance observer for estimation of parameter uncertainties. Estimated uncertainties values are injected in order to construct the control law, improving in this way the system's performance. The controller behavior, when tracking power references, is tested with realistic electromagnetic transients for DC /power systems computer-aided design simulations. In addition, the controller performance is checked in the presence of parameter uncertainties and nearby faults. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675797&sortType%3Das [...] [article] An adaptive nonlinear controller for DFIM-based wind energy conversion systems [texte imprimé] / Mauricio, J.M., Auteur ; Leon, A. E., Auteur ; Gomez-Exposito, A., Auteur . - 2009 . - pp. 1025 - 1035.
Energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1025 - 1035
Mots-clés : Adaptive control; asynchronous machines; feedback; linearisation techniques; machine control; nonlinear control systems; observers; parameter estimation; uncertain systems; wind power Résumé : An adaptive nonlinear controller for wind energy doubly fed induction machines is introduced in this paper. The proposed controller is based on the feedback linearization technique and includes a disturbance observer for estimation of parameter uncertainties. Estimated uncertainties values are injected in order to construct the control law, improving in this way the system's performance. The controller behavior, when tracking power references, is tested with realistic electromagnetic transients for DC /power systems computer-aided design simulations. In addition, the controller performance is checked in the presence of parameter uncertainties and nearby faults. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675797&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1036 - 1045
Titre : Ride-through control of a doubly fed induction generator under unbalanced voltage sags Type de document : texte imprimé Auteurs : Gomis-Bellmunt, O., Auteur ; Junyent-Ferre, A., Auteur ; Sumper, A., Auteur Année de publication : 2009 Article en page(s) : pp. 1036 - 1045 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Asynchronous generators; machine vector control; power convertors; power generation control; power grids; power supply quality; wind power plants Résumé : This paper deals with the control of doubly fed induction generators to ride through unbalanced voltage sags. A control strategy is proposed by choosing certain current reference values in the positive and negative sequences so that the torque and the DC voltage are kept stable during such unbalanced sags. Both rotor- and grid-side converters are considered, detailing the control scheme of each converter while considering the effect of the crowbar protection. The control strategy is validated by means of simulations. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675804&sortType%3Das [...] [article] Ride-through control of a doubly fed induction generator under unbalanced voltage sags [texte imprimé] / Gomis-Bellmunt, O., Auteur ; Junyent-Ferre, A., Auteur ; Sumper, A., Auteur . - 2009 . - pp. 1036 - 1045.
Energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1036 - 1045
Mots-clés : Asynchronous generators; machine vector control; power convertors; power generation control; power grids; power supply quality; wind power plants Résumé : This paper deals with the control of doubly fed induction generators to ride through unbalanced voltage sags. A control strategy is proposed by choosing certain current reference values in the positive and negative sequences so that the torque and the DC voltage are kept stable during such unbalanced sags. Both rotor- and grid-side converters are considered, detailing the control scheme of each converter while considering the effect of the crowbar protection. The control strategy is validated by means of simulations. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675804&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1046 - 1056
Titre : Performance of a five-phase induction machine with optimized air gap field under open loop V / f control Type de document : texte imprimé Auteurs : Scharlau, C.C., Auteur ; Pereira, L.F.A., Auteur ; Pereira, L.A., Auteur Année de publication : 2009 Article en page(s) : pp. 1046 - 1056 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Air gaps; asynchronous machines; frequency control; harmonic analysis; machine control; optimisation; stators; voltage control Résumé : The paper assesses the steady-state performance of a five-phase induction machine fed by a modified open loop constant volt/hertz (V/f) control method, which imposes a trapezoidal induction waveform in the air gap under varying load conditions. The trapezoidal air gap induction is achieved through the imposition of an appropriate combination of the third harmonic and fundamental stator voltages. This harmonic combination is determined from the steady-state model using a mathematical optimization procedure, which allows to obtain the optimal weighting factors for each harmonic component. The optimized reference voltages lead to a trapezoidal air gap induction, which allows a better iron utilization and higher output torque for the same rms stator current when compared to sinusoidal air gap induction. The resulting air gap induction is obtained from the induced voltage of a full pitch search coil placed in the air gap. The proposed control scheme was successfully simulated and implemented on a five-phase prototype machine running under different load conditions. Experimental and simulations results show an increase in the torque/ampere relationship for loads above 50% when compared to the conventional V/f method using only the fundamental current and air gap induction. A comparison between the simulation and experimental curves presents a very good agreement that confirms and validates the parameters and model used. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675793&sortType%3Das [...] [article] Performance of a five-phase induction machine with optimized air gap field under open loop V / f control [texte imprimé] / Scharlau, C.C., Auteur ; Pereira, L.F.A., Auteur ; Pereira, L.A., Auteur . - 2009 . - pp. 1046 - 1056.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1046 - 1056
Mots-clés : Air gaps; asynchronous machines; frequency control; harmonic analysis; machine control; optimisation; stators; voltage control Résumé : The paper assesses the steady-state performance of a five-phase induction machine fed by a modified open loop constant volt/hertz (V/f) control method, which imposes a trapezoidal induction waveform in the air gap under varying load conditions. The trapezoidal air gap induction is achieved through the imposition of an appropriate combination of the third harmonic and fundamental stator voltages. This harmonic combination is determined from the steady-state model using a mathematical optimization procedure, which allows to obtain the optimal weighting factors for each harmonic component. The optimized reference voltages lead to a trapezoidal air gap induction, which allows a better iron utilization and higher output torque for the same rms stator current when compared to sinusoidal air gap induction. The resulting air gap induction is obtained from the induced voltage of a full pitch search coil placed in the air gap. The proposed control scheme was successfully simulated and implemented on a five-phase prototype machine running under different load conditions. Experimental and simulations results show an increase in the torque/ampere relationship for loads above 50% when compared to the conventional V/f method using only the fundamental current and air gap induction. A comparison between the simulation and experimental curves presents a very good agreement that confirms and validates the parameters and model used. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675793&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1057 - 1063
Titre : A discontinuous PWM method for balancing the neutral point voltage in three-level inverter-fed variable frequency drives Type de document : texte imprimé Auteurs : Ben-Brahim, L., Auteur Année de publication : 2009 Article en page(s) : pp. 1057 - 1063 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : PWM invertors; electric drives Résumé : The paper describes a new discontinuous carrier-based pulsewidth modulation (PWM) method for use in variable frequency drives (VFD) driven by three-level inverters. The method introduces three different switching patterns for the full range of operating speeds. Depending on the actual operating speed, the proposed algorithm is developed to select the most suitable PWM switching pattern that improves the VFD performance. This results in low imbalance in the DC-link capacitor voltage, and low current distortions without increasing switching losses. Theory, simulation, and experimental results are presented. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675800&sortType%3Das [...] [article] A discontinuous PWM method for balancing the neutral point voltage in three-level inverter-fed variable frequency drives [texte imprimé] / Ben-Brahim, L., Auteur . - 2009 . - pp. 1057 - 1063.
Energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1057 - 1063
Mots-clés : PWM invertors; electric drives Résumé : The paper describes a new discontinuous carrier-based pulsewidth modulation (PWM) method for use in variable frequency drives (VFD) driven by three-level inverters. The method introduces three different switching patterns for the full range of operating speeds. Depending on the actual operating speed, the proposed algorithm is developed to select the most suitable PWM switching pattern that improves the VFD performance. This results in low imbalance in the DC-link capacitor voltage, and low current distortions without increasing switching losses. Theory, simulation, and experimental results are presented. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675800&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1064 - 1072
Titre : Control algorithm for coordinated reactive power compensation in a wind park Type de document : texte imprimé Auteurs : Diaz-Dorado, E., Auteur ; Carrillo, C., Auteur ; Cidras, J., Auteur Année de publication : 2009 Article en page(s) : pp. 1064 - 1072 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Asynchronous generators; centralised control; dynamic programming; reactive power control; wind power; wind turbines Résumé : The penetration level of wind energy is continuously growing, and it is especially relevant in European countries such as Denmark, Germany, and Spain. For this reason, grid codes in different countries have been recently revised, or are now under revision in order to integrate this energy in the network taking into account the security of supply. This paper is related to reactive compensation, which is one aspect usually included in these codes. On the other hand, a great number of installed wind parks are formed by fixed speed wind turbines equipped with induction generators. The typical scheme for reactive compensation in this kind of wind parks is based on capacitor banks locally controlled in each machine. This configuration makes very difficult to follow the requirements of the new grid codes. To overcome this problem, a configuration with a central controller that coordinates the actuation over all the capacitor steps in the wind park is proposed in this paper. A central controller algorithm that is based on a dynamic programming is presented and evaluated by means of simulation. At this time, the proposed scheme has been installed at the Sotavento Experimental Wind Park (Spain) and it is currently being tested. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675792&sortType%3Das [...] [article] Control algorithm for coordinated reactive power compensation in a wind park [texte imprimé] / Diaz-Dorado, E., Auteur ; Carrillo, C., Auteur ; Cidras, J., Auteur . - 2009 . - pp. 1064 - 1072.
Energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1064 - 1072
Mots-clés : Asynchronous generators; centralised control; dynamic programming; reactive power control; wind power; wind turbines Résumé : The penetration level of wind energy is continuously growing, and it is especially relevant in European countries such as Denmark, Germany, and Spain. For this reason, grid codes in different countries have been recently revised, or are now under revision in order to integrate this energy in the network taking into account the security of supply. This paper is related to reactive compensation, which is one aspect usually included in these codes. On the other hand, a great number of installed wind parks are formed by fixed speed wind turbines equipped with induction generators. The typical scheme for reactive compensation in this kind of wind parks is based on capacitor banks locally controlled in each machine. This configuration makes very difficult to follow the requirements of the new grid codes. To overcome this problem, a configuration with a central controller that coordinates the actuation over all the capacitor steps in the wind park is proposed in this paper. A central controller algorithm that is based on a dynamic programming is presented and evaluated by means of simulation. At this time, the proposed scheme has been installed at the Sotavento Experimental Wind Park (Spain) and it is currently being tested. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675792&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1073 - 1081
Titre : Enhanced control and operation of DFIG-based wind farms during network unbalance Type de document : texte imprimé Auteurs : Xu, Lie, Auteur Année de publication : 2009 Article en page(s) : pp. 1073 - 1081 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Asynchronous generators; convertors; power system control; wind power Résumé : This paper investigates the control and operation of doubly fed induction generator (DFIG)-based wind generation systems under unbalanced voltage conditions. DFIG system behaviors under unbalanced voltage are analyzed and different control targets are discussed. A new rotor current control strategy containing a main controller and an auxiliary controller is proposed. The main controller is implemented in the positive (dq)+ frame without involving positive/negative sequence decomposition, whereas the auxiliary controller is implemented in the negative (dq)- frame with negative sequence current extracted. The impact of providing unbalanced control on converter voltage rating is investigated. Simulation results using EMTDC/PSCAD are presented for a 2-MW DFIG wind generation system to validate the proposed control scheme and to demonstrate the enhanced system operation during ldquosmallrdquo steady state and ldquolargerdquo transient unbalances. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675801&sortType%3Das [...] [article] Enhanced control and operation of DFIG-based wind farms during network unbalance [texte imprimé] / Xu, Lie, Auteur . - 2009 . - pp. 1073 - 1081.
Energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1073 - 1081
Mots-clés : Asynchronous generators; convertors; power system control; wind power Résumé : This paper investigates the control and operation of doubly fed induction generator (DFIG)-based wind generation systems under unbalanced voltage conditions. DFIG system behaviors under unbalanced voltage are analyzed and different control targets are discussed. A new rotor current control strategy containing a main controller and an auxiliary controller is proposed. The main controller is implemented in the positive (dq)+ frame without involving positive/negative sequence decomposition, whereas the auxiliary controller is implemented in the negative (dq)- frame with negative sequence current extracted. The impact of providing unbalanced control on converter voltage rating is investigated. Simulation results using EMTDC/PSCAD are presented for a 2-MW DFIG wind generation system to validate the proposed control scheme and to demonstrate the enhanced system operation during ldquosmallrdquo steady state and ldquolargerdquo transient unbalances. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675801&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1082 - 1092
Titre : A multiagent-system-based intelligent reference governor for multiobjective optimal power plant operation Type de document : texte imprimé Auteurs : Heo, J.S., Auteur ; K. Y. Lee, Auteur Année de publication : 2009 Article en page(s) : pp. 1082 - 1092 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Large-scale systems; multi-agent systems; nonlinear functions; particle swarm optimisation; power engineering computing; thermal power stations Résumé : A large-scale power plant requires optimal set points, namely references, in several control loops for multiobjective optimal operation. In a 600-MW oil-fired drum-type boiler power unit, the set points considered are for the main steam pressure and reheater/superheater steam temperatures. The set points should be mapped with the varying unit load demand and satisfy the conflicting requirements in power plant operation. In practice, the set points are obtained using fixed nonlinear functions in the unit master control in a plant, which are designed for the single objective of load tracking with heat balance. However, it does not allow for process optimization under the multitude of conflicting objectives, which may be newly introduced and different from the initial design objective. This paper presents a methodology, multiagent-system-based intelligent reference governor (MAS-IRG), to realize the optimal mapping by searching for the best solution to the multiobjective optimization problem that tackles conflicting requirements. In searching for the optimal set points, a heuristic optimization tool, particle swarm optimization, is utilized to solve the multiobjective optimization problem. The IRG is designed based on the proposed MAS to operate at a higher level of automation, to execute asynchronous computations, and to reduce the computational complexity. The approach provides the means to specify optimal set points for controllers under a diverse operating scenarios online. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675799&sortType%3Das [...] [article] A multiagent-system-based intelligent reference governor for multiobjective optimal power plant operation [texte imprimé] / Heo, J.S., Auteur ; K. Y. Lee, Auteur . - 2009 . - pp. 1082 - 1092.
Energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1082 - 1092
Mots-clés : Large-scale systems; multi-agent systems; nonlinear functions; particle swarm optimisation; power engineering computing; thermal power stations Résumé : A large-scale power plant requires optimal set points, namely references, in several control loops for multiobjective optimal operation. In a 600-MW oil-fired drum-type boiler power unit, the set points considered are for the main steam pressure and reheater/superheater steam temperatures. The set points should be mapped with the varying unit load demand and satisfy the conflicting requirements in power plant operation. In practice, the set points are obtained using fixed nonlinear functions in the unit master control in a plant, which are designed for the single objective of load tracking with heat balance. However, it does not allow for process optimization under the multitude of conflicting objectives, which may be newly introduced and different from the initial design objective. This paper presents a methodology, multiagent-system-based intelligent reference governor (MAS-IRG), to realize the optimal mapping by searching for the best solution to the multiobjective optimization problem that tackles conflicting requirements. In searching for the optimal set points, a heuristic optimization tool, particle swarm optimization, is utilized to solve the multiobjective optimization problem. The IRG is designed based on the proposed MAS to operate at a higher level of automation, to execute asynchronous computations, and to reduce the computational complexity. The approach provides the means to specify optimal set points for controllers under a diverse operating scenarios online. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675799&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1093 - 1104
Titre : Analysis of a fuel cell durability test based on design of experiment approach Type de document : texte imprimé Auteurs : Wahdame, B., Auteur ; Candusso, D., Auteur ; Francois, X., Auteur Année de publication : 2009 Article en page(s) : pp. 1093 - 1104 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Durability; electrochemical impedance spectroscopy; life testing; proton exchange membrane fuel cells; response surface methodology; stoichiometry Résumé : The results of a durability test performed during 1000 h on a proton exchange or polymer electrolyte membrane (PEM) fuel cell are analyzed using some well-suited design of experiment techniques. The response surface methodology is adopted to model the performance degradation over ageing time from various load current--fuel cell voltage curves recorded at regular time-spaced intervals and for various air utilization rates. The dual response surface approach is employed to determine the most convenient operating conditions for the cells (load current and air stoichiometry rate levels), leading to a tradeoff between elevated electrical efficiency and low voltage variability versus ageing time and cell positions in the stack. In addition, some electrochemical impedance spectra are used to provide some physical interpretations and to corroborate the observations made from the static measurements. The work shows notably the benefit of using some variable stoichiometry rates through ageing time to get high-power levels and stable performances as well. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675795&sortType%3Das [...] [article] Analysis of a fuel cell durability test based on design of experiment approach [texte imprimé] / Wahdame, B., Auteur ; Candusso, D., Auteur ; Francois, X., Auteur . - 2009 . - pp. 1093 - 1104.
Energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1093 - 1104
Mots-clés : Durability; electrochemical impedance spectroscopy; life testing; proton exchange membrane fuel cells; response surface methodology; stoichiometry Résumé : The results of a durability test performed during 1000 h on a proton exchange or polymer electrolyte membrane (PEM) fuel cell are analyzed using some well-suited design of experiment techniques. The response surface methodology is adopted to model the performance degradation over ageing time from various load current--fuel cell voltage curves recorded at regular time-spaced intervals and for various air utilization rates. The dual response surface approach is employed to determine the most convenient operating conditions for the cells (load current and air stoichiometry rate levels), leading to a tradeoff between elevated electrical efficiency and low voltage variability versus ageing time and cell positions in the stack. In addition, some electrochemical impedance spectra are used to provide some physical interpretations and to corroborate the observations made from the static measurements. The work shows notably the benefit of using some variable stoichiometry rates through ageing time to get high-power levels and stable performances as well. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675795&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1105 - 1107
Titre : A modified MPPT scheme for accelerated convergence Type de document : texte imprimé Auteurs : Sokolov, M., Auteur ; Shmilovitz, D., Auteur Année de publication : 2009 Article en page(s) : pp. 1105 - 1107 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Convergence; linear systems; photovoltaic power systems; power system control Résumé : Fast tracking of photovoltaic maximum power point (MPP) is accomplished by a linear control loop that emulates a nearly matched load line. Thus, the response time of conventional MPP trackers is significantly accelerated. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675796&sortType%3Das [...] [article] A modified MPPT scheme for accelerated convergence [texte imprimé] / Sokolov, M., Auteur ; Shmilovitz, D., Auteur . - 2009 . - pp. 1105 - 1107.
Energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1105 - 1107
Mots-clés : Convergence; linear systems; photovoltaic power systems; power system control Résumé : Fast tracking of photovoltaic maximum power point (MPP) is accomplished by a linear control loop that emulates a nearly matched load line. Thus, the response time of conventional MPP trackers is significantly accelerated. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675796&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1108 - 1110
Titre : An electrical approach to mechanical effort reduction in wind energy conversion systems Type de document : texte imprimé Auteurs : Mauricio, J.M., Auteur ; Leon, A. E., Auteur ; Gomez-Exposito, A., Auteur Année de publication : 2009 Article en page(s) : pp. 1108 - 1110 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Electric generators; machine control; power generation control; wind power plants Résumé : A strategy for controlling wind farms composed of variable-speed machines is considered in this paper. It is shown that mechanical efforts produced by wind gusts on individual machines can be reduced by means of a supplementary control signal coming from a centralized controller. This is done while the total wind farm power output is kept at the same value as in the absence of the proposed controller. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675798&sortType%3Das [...] [article] An electrical approach to mechanical effort reduction in wind energy conversion systems [texte imprimé] / Mauricio, J.M., Auteur ; Leon, A. E., Auteur ; Gomez-Exposito, A., Auteur . - 2009 . - pp. 1108 - 1110.
Energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1108 - 1110
Mots-clés : Electric generators; machine control; power generation control; wind power plants Résumé : A strategy for controlling wind farms composed of variable-speed machines is considered in this paper. It is shown that mechanical efforts produced by wind gusts on individual machines can be reduced by means of a supplementary control signal coming from a centralized controller. This is done while the total wind farm power output is kept at the same value as in the absence of the proposed controller. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675798&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1111 - 1113
Titre : An analytical approach to determine the optimal resistance for the three-series-resistor method for induction generator connection Type de document : texte imprimé Auteurs : Grilo, A. P., Auteur ; Sharghi, A., Auteur ; Freitas, W., Auteur Année de publication : 2009 Article en page(s) : pp. 1111 - 1113 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Asynchronous generators; resistors Résumé : This letter presents a set of analytical formulas to determine the optimal resistor size to be used in the three-series-resistor method of squirrel-cage induction generators connection. The analytical formulation is based on the short-circuit theory of induction machines. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675806&sortType%3Das [...] [article] An analytical approach to determine the optimal resistance for the three-series-resistor method for induction generator connection [texte imprimé] / Grilo, A. P., Auteur ; Sharghi, A., Auteur ; Freitas, W., Auteur . - 2009 . - pp. 1111 - 1113.
Energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1111 - 1113
Mots-clés : Asynchronous generators; resistors Résumé : This letter presents a set of analytical formulas to determine the optimal resistor size to be used in the three-series-resistor method of squirrel-cage induction generators connection. The analytical formulation is based on the short-circuit theory of induction machines. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675806&sortType%3Das [...]
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