Dépouillements

Influence of saturation level on the effect of broken bars in induction motors using fundamental electromagnetic laws and finite element simulations / Sprooten, Jprooten in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp.557 - 564 Titre : Influence of saturation level on the effect of broken bars in induction motors using fundamental electromagnetic laws and finite element simulations Type de document : texte imprimé Auteurs : Sprooten, Jprooten, Auteur ; Maun, Jean-Claude, Auteur Année de publication : 2010 Article en page(s) : pp.557 - 564 Note générale : Energy Conversion Langues : Anglais (eng) Mots-clés : fault--location--finite  element--analysis--stators Résumé : This study is dedicated to faulty induction motors. These motors are often used in industrial applications and the monitoring of their condition becomes important for production maximization. This paper gives precise understanding of the effect of the broken bar on the stator currents, a quantity more and more used for fault detection and quantification. This study uses 2-D finite element (FE) models for detailed field analysis and considers different saturation levels (voltage levels). Fundamental electromagnetic laws are used to interpret FE results. It is shown that the presence of local saturation tends to lower the effect of a broken bar on the stator currents. This effect increases with the voltage level and must be taken into consideration for precise quantification of the fault. Furthermore, on a local point of view, the presence of a broken bar leads to highly saturated regions in the neighborhood of the broken bar that will influence the progression of the fault. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5075650&sortType%3Das [...] [article] Influence of saturation level on the effect of broken bars in induction motors using fundamental electromagnetic laws and finite element simulations [texte imprimé] / Sprooten, Jprooten, Auteur ; Maun, Jean-Claude, Auteur . - 2010 . - pp.557 - 564. Energy Conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp.557 - 564 Mots-clés : fault--location--finite  element--analysis--stators Résumé : This study is dedicated to faulty induction motors. These motors are often used in industrial applications and the monitoring of their condition becomes important for production maximization. This paper gives precise understanding of the effect of the broken bar on the stator currents, a quantity more and more used for fault detection and quantification. This study uses 2-D finite element (FE) models for detailed field analysis and considers different saturation levels (voltage levels). Fundamental electromagnetic laws are used to interpret FE results. It is shown that the presence of local saturation tends to lower the effect of a broken bar on the stator currents. This effect increases with the voltage level and must be taken into consideration for precise quantification of the fault. Furthermore, on a local point of view, the presence of a broken bar leads to highly saturated regions in the neighborhood of the broken bar that will influence the progression of the fault. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5075650&sortType%3Das [...]

A schwarz–christoffel-based analytical method for electric machine field analysis / O'Connell, T.C. in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - 565 - 577 Titre : A schwarz–christoffel-based analytical method for electric machine field analysis Type de document : texte imprimé Auteurs : O'Connell, T.C., Auteur ; Krein, Philip T., Auteur Année de publication : 2010 Article en page(s) : 565 - 577 Note générale : Energy Conversion Langues : Anglais (eng) Mots-clés : Asynchronous  machines--Electric  machine--Analysis  computing--Magnetic  materials Résumé : With the recent increase in the availability and widespread use of inverters, exotic rare earth permanent-magnet materials, and low-cost, precision manufacturing, new design tools are needed to aid engineers in designing state-of-the-art electromechanical systems. For this purpose, recent software advances allow a reexamination of previously intractable analytical solutions to the boundary value problems governing these systems. This paper presents an analytical field analysis method for electric machines utilizing the Schwarz-Christoffel transformation and implemented with the SC Toolbox software package. With the method, general 2-D electric machine cross sections with linear magnetic materials are analyzed. The method is then extended using superposition to analyze wound-rotor induction machines in the time domain. With this extension, numerous machine geometries, stator excitations, winding and slot harmonics, and torque ripple can be examined. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5224013&sortType%3Das [...] [article] A schwarz–christoffel-based analytical method for electric machine field analysis [texte imprimé] / O'Connell, T.C., Auteur ; Krein, Philip T., Auteur . - 2010 . - 565 - 577. Energy Conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - 565 - 577 Mots-clés : Asynchronous  machines--Electric  machine--Analysis  computing--Magnetic  materials Résumé : With the recent increase in the availability and widespread use of inverters, exotic rare earth permanent-magnet materials, and low-cost, precision manufacturing, new design tools are needed to aid engineers in designing state-of-the-art electromechanical systems. For this purpose, recent software advances allow a reexamination of previously intractable analytical solutions to the boundary value problems governing these systems. This paper presents an analytical field analysis method for electric machines utilizing the Schwarz-Christoffel transformation and implemented with the SC Toolbox software package. With the method, general 2-D electric machine cross sections with linear magnetic materials are analyzed. The method is then extended using superposition to analyze wound-rotor induction machines in the time domain. With this extension, numerous machine geometries, stator excitations, winding and slot harmonics, and torque ripple can be examined. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5224013&sortType%3Das [...]

A new rapid nonlinear simulation method for switched reluctance motors / C. Xia in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 578 - 586 Titre : A new rapid nonlinear simulation method for switched reluctance motors Type de document : texte imprimé Auteurs : C. Xia, Auteur ; Xue, M, Auteur ; Shi, T.N., Auteur Année de publication : 2010 Article en page(s) : pp. 578 - 586 Note générale : Energy Conversion Langues : Anglais (eng) Mots-clés : Curve  fitting--Magnetisation--Reluctance  motors Résumé : This paper presents a new rapid nonlinear simulation method for switched reluctance motors (SRMs). An exact mathematical relationship among the magnetization curves of an SRM is obtained by curve fitting the variable parameters in the Torrey model. Only geometry-based requirements are taken as input needed. Since complete magnetic characteristics are not necessary, a lot of preliminary measurements and calculations are eliminated. The dynamic performances under two operating conditions are predicted using the proposed method, and the measured results are obtained by an experimental laboratory setup. Furthermore, predictions using other two traditional models are presented for the purpose of comparison. Experimental and simulation results verify the accuracy and rapidity of the proposed method. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5075651&sortType%3Das [...] [article] A new rapid nonlinear simulation method for switched reluctance motors [texte imprimé] / C. Xia, Auteur ; Xue, M, Auteur ; Shi, T.N., Auteur . - 2010 . - pp. 578 - 586. Energy Conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 578 - 586 Mots-clés : Curve  fitting--Magnetisation--Reluctance  motors Résumé : This paper presents a new rapid nonlinear simulation method for switched reluctance motors (SRMs). An exact mathematical relationship among the magnetization curves of an SRM is obtained by curve fitting the variable parameters in the Torrey model. Only geometry-based requirements are taken as input needed. Since complete magnetic characteristics are not necessary, a lot of preliminary measurements and calculations are eliminated. The dynamic performances under two operating conditions are predicted using the proposed method, and the measured results are obtained by an experimental laboratory setup. Furthermore, predictions using other two traditional models are presented for the purpose of comparison. Experimental and simulation results verify the accuracy and rapidity of the proposed method. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5075651&sortType%3Das [...]

Force calculation in 3-D magnetic equivalent circuit networks with a maxwell stress tensor / Amrhein, M. in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 587 - 593 Titre : Force calculation in 3-D magnetic equivalent circuit networks with a maxwell stress tensor Type de document : texte imprimé Auteurs : Amrhein, M., Auteur ; Krein, P.T., Auteur Année de publication : 2010 Article en page(s) : pp. 587 - 593 Note générale : Energy Conversion Langues : Anglais (eng) Mots-clés : Finite  element  analysis--Magnetic  circuits Résumé : Magnetic equivalent circuit (MEC) models are increasingly valuable for analysis and design of electromechanical devices, particularly electrical machines, because of their moderate computational effort and reasonable accuracy. Force and torque calculations in prior MEC implementations are almost exclusively based on the virtual work method (VWM) adapted to the specific device model. But VWM does not easily extend to a general MEC modeling approach. In this paper, the more direct Maxwell stress tensor (MST) method is applied to a general 3-D MEC modeling framework. MST theory and implementation are presented. Its application is discussed with the example of an electromagnet. Results are compared to both measurements and analytical and finite-element models. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5075663&sortType%3Das [...] [article] Force calculation in 3-D magnetic equivalent circuit networks with a maxwell stress tensor [texte imprimé] / Amrhein, M., Auteur ; Krein, P.T., Auteur . - 2010 . - pp. 587 - 593. Energy Conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 587 - 593 Mots-clés : Finite  element  analysis--Magnetic  circuits Résumé : Magnetic equivalent circuit (MEC) models are increasingly valuable for analysis and design of electromechanical devices, particularly electrical machines, because of their moderate computational effort and reasonable accuracy. Force and torque calculations in prior MEC implementations are almost exclusively based on the virtual work method (VWM) adapted to the specific device model. But VWM does not easily extend to a general MEC modeling approach. In this paper, the more direct Maxwell stress tensor (MST) method is applied to a general 3-D MEC modeling framework. MST theory and implementation are presented. Its application is discussed with the example of an electromagnet. Results are compared to both measurements and analytical and finite-element models. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5075663&sortType%3Das [...]

Slotless PM brushless motor with helical edge-wound laminations / Sharkh S.M. in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 594 - 598 Titre : Slotless PM brushless motor with helical edge-wound laminations Type de document : texte imprimé Auteurs : Sharkh S.M., Auteur ; Lai S.H., Auteur Année de publication : 2010 Article en page(s) : pp. 594 - 598 Note générale : Energy Conversion Langues : Anglais (eng) Mots-clés : Brushless  machines--Finite  element  analysis--Sermanent  magnet  motorsStators Résumé : This paper discusses the analysis and design of a very thin slotless permanent-magnet (PM) brushless motor whose stator laminations are manufactured from a single strip of steel that is edge wound into a spiral (like a ldquoslinkyrdquo) and then fitted over the windings that are preformed on the outside surface of a nonconducting former. Analytical and finite-element analysis (FEA) were used to determine the constrained optimum dimensions of a motor used to drive a rim-driven thruster in which the motor rotor is fitted onto the rim of the propeller and the stator is encapsulated in the thin Kort nozzle of the thruster. This paper describes the fabrication of a demonstrator motor and presents experimental results to validate the theoretical calculations. Experimental motor performance results are also reported and compared with those of a slotted motor that fits within the same active radial dimensions as the slotless motor. The slotless motor, which has longer active length and endwindings, and thicker magnets than the slotted motor, was found to be less efficient and more expensive (prototype cost) than the slotted machine. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5224012&sortType%3Das [...] [article] Slotless PM brushless motor with helical edge-wound laminations [texte imprimé] / Sharkh S.M., Auteur ; Lai S.H., Auteur . - 2010 . - pp. 594 - 598. Energy Conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 594 - 598 Mots-clés : Brushless  machines--Finite  element  analysis--Sermanent  magnet  motorsStators Résumé : This paper discusses the analysis and design of a very thin slotless permanent-magnet (PM) brushless motor whose stator laminations are manufactured from a single strip of steel that is edge wound into a spiral (like a ldquoslinkyrdquo) and then fitted over the windings that are preformed on the outside surface of a nonconducting former. Analytical and finite-element analysis (FEA) were used to determine the constrained optimum dimensions of a motor used to drive a rim-driven thruster in which the motor rotor is fitted onto the rim of the propeller and the stator is encapsulated in the thin Kort nozzle of the thruster. This paper describes the fabrication of a demonstrator motor and presents experimental results to validate the theoretical calculations. Experimental motor performance results are also reported and compared with those of a slotted motor that fits within the same active radial dimensions as the slotless motor. The slotless motor, which has longer active length and endwindings, and thicker magnets than the slotted motor, was found to be less efficient and more expensive (prototype cost) than the slotted machine. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5224012&sortType%3Das [...]

Characterization of the rotor magnetic field in a brushless doubly-fed induction machine / Blàzquez, F. in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 599 - 607 Titre : Characterization of the rotor magnetic field in a brushless doubly-fed induction machine Type de document : texte imprimé Auteurs : Blàzquez, F., Auteur ; Veganzones, C., Auteur ; Ramirez D., Auteur Année de publication : 2010 Article en page(s) : pp. 599 - 607 Note générale : Energy Conversion Langues : Anglais (eng) Mots-clés : Brushless  machines--Induction  motors--Rotors--Stators--Synchronous  machines Résumé : The large increase in wind generation could improve the final development of wind systems with brushless doubly-fed induction machines (BDFIM) as an alternative to the doubly-fed asynchronous machines. For this reason, a detailed study of several aspects of the BDFIM design, as well as of its rotor configuration, is absolutely essential. In this paper, the authors present an alternative formulation of the BDFIM operating principle in synchronous mode. Besides the basic equation of the machine operation, it presents as main advantage the precise characterization of all the magnetic field components in a BDFIM with idealized stator windings and an idealized rotor cage. Based on this formulation, the paper provides a standard that may be used to compare the fields created by different real BDFIMs. This standard has been validated by laboratory tests. Published in: Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5224018&sortType%3Das [...] [article] Characterization of the rotor magnetic field in a brushless doubly-fed induction machine [texte imprimé] / Blàzquez, F., Auteur ; Veganzones, C., Auteur ; Ramirez D., Auteur . - 2010 . - pp. 599 - 607. Energy Conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 599 - 607 Mots-clés : Brushless  machines--Induction  motors--Rotors--Stators--Synchronous  machines Résumé : The large increase in wind generation could improve the final development of wind systems with brushless doubly-fed induction machines (BDFIM) as an alternative to the doubly-fed asynchronous machines. For this reason, a detailed study of several aspects of the BDFIM design, as well as of its rotor configuration, is absolutely essential. In this paper, the authors present an alternative formulation of the BDFIM operating principle in synchronous mode. Besides the basic equation of the machine operation, it presents as main advantage the precise characterization of all the magnetic field components in a BDFIM with idealized stator windings and an idealized rotor cage. Based on this formulation, the paper provides a standard that may be used to compare the fields created by different real BDFIMs. This standard has been validated by laboratory tests. Published in: Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5224018&sortType%3Das [...]

An unsymmetrical two-phase induction motor drive with slip-frequency control / Abdel-Rahim N.M.B. in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 608 - 616 Titre : An unsymmetrical two-phase induction motor drive with slip-frequency control Type de document : texte imprimé Auteurs : Abdel-Rahim N.M.B., Auteur ; Shaltout A., Auteur Année de publication : 2010 Article en page(s) : pp. 608 - 616 Note générale : Energy Conversion Langues : Anglais (eng) Mots-clés : Closed  loop  systems--Frequency  control--Induction  motor  drives--Machine  control--Stators Résumé : This paper proposes a closed-loop control strategy to operate an off-the-shelf single-phase induction motor (IM) as a symmetrical two-phase IM. The proposed control strategy employs the SFC technique to independently control the stator currents of both the main and auxiliary windings, and make them follow a predefined sinusoidal waveform. Simulation and experimental results show that the proposed scheme is successful in operating the conventional single-phase IM as a symmetrical two-phase IM with fast dynamic and transient responses. In addition, the proposed control system achieves cost-effectiveness in both initial and running costs. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5224016&sortType%3Das [...] [article] An unsymmetrical two-phase induction motor drive with slip-frequency control [texte imprimé] / Abdel-Rahim N.M.B., Auteur ; Shaltout A., Auteur . - 2010 . - pp. 608 - 616. Energy Conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 608 - 616 Mots-clés : Closed  loop  systems--Frequency  control--Induction  motor  drives--Machine  control--Stators Résumé : This paper proposes a closed-loop control strategy to operate an off-the-shelf single-phase induction motor (IM) as a symmetrical two-phase IM. The proposed control strategy employs the SFC technique to independently control the stator currents of both the main and auxiliary windings, and make them follow a predefined sinusoidal waveform. Simulation and experimental results show that the proposed scheme is successful in operating the conventional single-phase IM as a symmetrical two-phase IM with fast dynamic and transient responses. In addition, the proposed control system achieves cost-effectiveness in both initial and running costs. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5224016&sortType%3Das [...]

Load-following strategies for evolution of solid oxide fuel cells into model citizens of the grid / Auld, A. E in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 617 - 625 Titre : Load-following strategies for evolution of solid oxide fuel cells into model citizens of the grid Type de document : texte imprimé Auteurs : Auld, A. E, Auteur ; Scott Samuelsen, Auteur ; Jack Brouwer, Auteur Année de publication : 2010 Article en page(s) : pp. 617 - 625 Note générale : Energy Conversion Langues : Anglais (eng) Mots-clés : DC-DC  power  convertors--Distributed  power  generation--Fuel  cell  power  plants--Power  grids--Solid  oxide--fuel  cells--Supercapacitors Résumé : Proper converter design can allow solid oxide fuel cells operated as distributed generators to mutually benefit both the load and the electric utility during steady-state conditions, but dynamic load variations still present challenges. Unlike standard synchronous generators, fuel cells lack rotating inertia and their output power ramp rate is limited by design. Two strategies are herein investigated to mitigate the impact of a large load perturbation on the electric utility grid: 1) external use of ultracapacitor electrical storage connected through a DC-DC converter and 2) internal reduction of steady-state fuel utilization in the fuel cell to enable faster response to output power perturbations. Both strategies successfully eliminate the impact of a load perturbation on the utility grid. The external ultracapacitor strategy requires more capital investment while the internal fuel utilization strategy requires higher fuel use. This success implies that there is substantial flexibility for designing load-following fuel cell systems that are model citizens. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5196797&sortType%3Das [...] [article] Load-following strategies for evolution of solid oxide fuel cells into model citizens of the grid [texte imprimé] / Auld, A. E, Auteur ; Scott Samuelsen, Auteur ; Jack Brouwer, Auteur . - 2010 . - pp. 617 - 625. Energy Conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 617 - 625 Mots-clés : DC-DC  power  convertors--Distributed  power  generation--Fuel  cell  power  plants--Power  grids--Solid  oxide--fuel  cells--Supercapacitors Résumé : Proper converter design can allow solid oxide fuel cells operated as distributed generators to mutually benefit both the load and the electric utility during steady-state conditions, but dynamic load variations still present challenges. Unlike standard synchronous generators, fuel cells lack rotating inertia and their output power ramp rate is limited by design. Two strategies are herein investigated to mitigate the impact of a large load perturbation on the electric utility grid: 1) external use of ultracapacitor electrical storage connected through a DC-DC converter and 2) internal reduction of steady-state fuel utilization in the fuel cell to enable faster response to output power perturbations. Both strategies successfully eliminate the impact of a load perturbation on the utility grid. The external ultracapacitor strategy requires more capital investment while the internal fuel utilization strategy requires higher fuel use. This success implies that there is substantial flexibility for designing load-following fuel cell systems that are model citizens. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5196797&sortType%3Das [...]

Dynamic stability enhancement and power flow control of a hybrid wind and marine-current farm using SMES / Wang, Li in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 626 - 639 Titre : Dynamic stability enhancement and power flow control of a hybrid wind and marine-current farm using SMES Type de document : texte imprimé Auteurs : Wang, Li, Auteur ; Shiang-Shong Chen, Auteur ; Wei-Jen Lee, Auteur Année de publication : 2010 Article en page(s) : pp. 626 - 639 Note générale : Energy Conversion Langues : Anglais (eng) Mots-clés : Asynchronous  generators--Power  control--Superconducting  magnet  energy  storage--Wind  power Résumé : This paper presents a control scheme based on a superconducting magnetic energy storage (SMES) unit to achieve both power flow control and damping enhancement of a novel hybrid wind and marine-current farm (MCF) connected to a large power grid. The performance of the studied wind farm (WF) is simulated by an equivalent 80-MW induction generator (IG) while an equivalent 60-MW IG is employed to simulate the characteristics of the MCF. A damping controller for the SMES unit is designed by using modal control theory to contribute effective damping characteristics to the studied combined WF and MCF under different operating conditions. A frequency-domain approach based on a linearized system model using eigen techniques and a time-domain scheme based on a nonlinear system model subject to disturbance conditions are both employed to validate the effectiveness of the proposed control scheme. It can be concluded from the simulated results that the proposed SMES unit combined with the designed damping controller is very effective to stabilize the studied combined WF and MCF under various wind speeds. The inherent fluctuations of the injected active power and reactive power of the WF and MCF to the power grid can also be effectively controlled by the proposed control scheme. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5071238&sortType%3Das [...] [article] Dynamic stability enhancement and power flow control of a hybrid wind and marine-current farm using SMES [texte imprimé] / Wang, Li, Auteur ; Shiang-Shong Chen, Auteur ; Wei-Jen Lee, Auteur . - 2010 . - pp. 626 - 639. Energy Conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 626 - 639 Mots-clés : Asynchronous  generators--Power  control--Superconducting  magnet  energy  storage--Wind  power Résumé : This paper presents a control scheme based on a superconducting magnetic energy storage (SMES) unit to achieve both power flow control and damping enhancement of a novel hybrid wind and marine-current farm (MCF) connected to a large power grid. The performance of the studied wind farm (WF) is simulated by an equivalent 80-MW induction generator (IG) while an equivalent 60-MW IG is employed to simulate the characteristics of the MCF. A damping controller for the SMES unit is designed by using modal control theory to contribute effective damping characteristics to the studied combined WF and MCF under different operating conditions. A frequency-domain approach based on a linearized system model using eigen techniques and a time-domain scheme based on a nonlinear system model subject to disturbance conditions are both employed to validate the effectiveness of the proposed control scheme. It can be concluded from the simulated results that the proposed SMES unit combined with the designed damping controller is very effective to stabilize the studied combined WF and MCF under various wind speeds. The inherent fluctuations of the injected active power and reactive power of the WF and MCF to the power grid can also be effectively controlled by the proposed control scheme. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5071238&sortType%3Das [...]

Flicker mitigation by active power control of variable-speed wind turbines with full-scale back-to-back power converters / Weihao Hu in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 640 - 649 Titre : Flicker mitigation by active power control of variable-speed wind turbines with full-scale back-to-back power converters Type de document : texte imprimé Auteurs : Weihao Hu, Auteur ; Zhe, Chen, Auteur ; Yue Wang, Auteur Année de publication : 2010 Article en page(s) : pp. 640 - 649 Note générale : Energy Conversion Langues : Anglais (eng) Mots-clés : Power  convertors--Power  system  CAD--Reactive  power  control--Wind  turbines Résumé : Grid-connected wind turbines are fluctuating power sources that may produce flicker during continuous operation. This paper presents a simulation model of a megawatt-level variable-speed wind turbine with a full-scale back-to-back power converter developed in the simulation tool of PSCAD/EMTDC. Flicker emission of this system is investigated. Reactive power compensation is mostly adopted for flicker mitigation. However, the flicker mitigation technique shows its limits, when the grid impedance angle is low in some distribution networks. A new method of flicker mitigation by controlling active power is proposed. It smoothes the 3p active power oscillations from wind shear and tower shadow effects of the wind turbine by varying the dc-link voltage of the full-scale converter. Simulation results show that damping the 3p active power oscillation by using the flicker mitigation controller is an effective means for flicker mitigation of variable-speed wind turbines with full-scale back-to-back power converters during continuous operation. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5071239&sortType%3Das [...] [article] Flicker mitigation by active power control of variable-speed wind turbines with full-scale back-to-back power converters [texte imprimé] / Weihao Hu, Auteur ; Zhe, Chen, Auteur ; Yue Wang, Auteur . - 2010 . - pp. 640 - 649. Energy Conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 640 - 649 Mots-clés : Power  convertors--Power  system  CAD--Reactive  power  control--Wind  turbines Résumé : Grid-connected wind turbines are fluctuating power sources that may produce flicker during continuous operation. This paper presents a simulation model of a megawatt-level variable-speed wind turbine with a full-scale back-to-back power converter developed in the simulation tool of PSCAD/EMTDC. Flicker emission of this system is investigated. Reactive power compensation is mostly adopted for flicker mitigation. However, the flicker mitigation technique shows its limits, when the grid impedance angle is low in some distribution networks. A new method of flicker mitigation by controlling active power is proposed. It smoothes the 3p active power oscillations from wind shear and tower shadow effects of the wind turbine by varying the dc-link voltage of the full-scale converter. Simulation results show that damping the 3p active power oscillation by using the flicker mitigation controller is an effective means for flicker mitigation of variable-speed wind turbines with full-scale back-to-back power converters during continuous operation. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5071239&sortType%3Das [...]

Improving stability of a DFIG-based wind power system with tuned damping controller / Mishra Y in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 650 - 660 Titre : Improving stability of a DFIG-based wind power system with tuned damping controller Type de document : texte imprimé Auteurs : Mishra Y, Auteur ; S. Mishra, Auteur ; Tripathy M, Auteur Année de publication : 2010 Article en page(s) : pp. 650 - 660 Note générale : Energy Conversion Langues : Anglais (eng) Mots-clés : Asynchronous  generators--Damping--Time-domain  analysis--Wind  power  plants Résumé : This paper focuses on the implementation of a damping controller for the doubly fed induction generator (DFIG) system. Coordinated tuning of the damping controller to enhance the damping of the oscillatory modes is presented using bacterial foraging technique. The effect of the tuned damping controller on converter ratings of the DFIG system is also investigated. The results of both eigenvalue analysis and the time-domain simulation studies are presented to elucidate the effectiveness of the tuned damping controller in the DFIG system. The improvement of the fault ride-through capability of the system is also demonstrated. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5075556&sortType%3Das [...] [article] Improving stability of a DFIG-based wind power system with tuned damping controller [texte imprimé] / Mishra Y, Auteur ; S. Mishra, Auteur ; Tripathy M, Auteur . - 2010 . - pp. 650 - 660. Energy Conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 650 - 660 Mots-clés : Asynchronous  generators--Damping--Time-domain  analysis--Wind  power  plants Résumé : This paper focuses on the implementation of a damping controller for the doubly fed induction generator (DFIG) system. Coordinated tuning of the damping controller to enhance the damping of the oscillatory modes is presented using bacterial foraging technique. The effect of the tuned damping controller on converter ratings of the DFIG system is also investigated. The results of both eigenvalue analysis and the time-domain simulation studies are presented to elucidate the effectiveness of the tuned damping controller in the DFIG system. The improvement of the fault ride-through capability of the system is also demonstrated. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5075556&sortType%3Das [...]

Wind farms as reactive power ancillary service providers—technical and economic issues / Ullah N.R in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 661 - 672 Titre : Wind farms as reactive power ancillary service providers—technical and economic issues Type de document : texte imprimé Auteurs : Ullah N.R, Auteur ; Bhattacharya K, Auteur ; Thiringer T., Auteur Année de publication : 2010 Article en page(s) : pp. 661 - 672 Note générale : Energy Conversion Langues : Anglais (eng) Mots-clés : Power  generation  economics--Reactive  power--Wind  power--Wind  turbines Résumé : This paper examines the possibility of providing reactive power support to the grid from wind farms (WFs) as a part of the ancillary service provisions. Detailed analysis of the WF capability curve is carried out considering maximum hourly variation of wind power from the forecasted value. Different cost components are identified, and subsequently, a generalized reactive power cost model is developed for wind turbine generators that can help the independent system operator (ISO) in managing the system and the grid efficiently. Apart from the fixed cost and the cost of loss components, a new method is proposed to calculate the opportunity cost component for a WF considering hourly wind variations. The Cigre 32-bus test system is used to demonstrate a case study showing the implementation of the developed model in short-term system operations. A finding is that higher wind speed prediction errors (a site with high degree of wind fluctuations) may lead to increased payments to the WFs for this service, mainly due to the increased lost opportunity cost (LOC) component. In a demonstrated case, it is found that 2340 $/h is paid to the WF as the LOC payment only, when the wind prediction error is 0.5 per unit (p.u.), whereas 54 $/h is the expected total payment to the WF when the prediction error is 0.2 p.u. for its reactive power service. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4768680&sortType%3Das [...] [article] Wind farms as reactive power ancillary service providers—technical and economic issues [texte imprimé] / Ullah N.R, Auteur ; Bhattacharya K, Auteur ; Thiringer T., Auteur . - 2010 . - pp. 661 - 672. Energy Conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 661 - 672 Mots-clés : Power  generation  economics--Reactive  power--Wind  power--Wind  turbines Résumé : This paper examines the possibility of providing reactive power support to the grid from wind farms (WFs) as a part of the ancillary service provisions. Detailed analysis of the WF capability curve is carried out considering maximum hourly variation of wind power from the forecasted value. Different cost components are identified, and subsequently, a generalized reactive power cost model is developed for wind turbine generators that can help the independent system operator (ISO) in managing the system and the grid efficiently. Apart from the fixed cost and the cost of loss components, a new method is proposed to calculate the opportunity cost component for a WF considering hourly wind variations. The Cigre 32-bus test system is used to demonstrate a case study showing the implementation of the developed model in short-term system operations. A finding is that higher wind speed prediction errors (a site with high degree of wind fluctuations) may lead to increased payments to the WFs for this service, mainly due to the increased lost opportunity cost (LOC) component. In a demonstrated case, it is found that 2340 $/h is paid to the WF as the LOC payment only, when the wind prediction error is 0.5 per unit (p.u.), whereas 54 $/h is the expected total payment to the WF when the prediction error is 0.2 p.u. for its reactive power service. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4768680&sortType%3Das [...]

Experimental evaluation of active filtering in a single-phase high-frequency AC microgrid / Sudipta Chakraborty in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 673 - 682 Titre : Experimental evaluation of active filtering in a single-phase high-frequency AC microgrid Type de document : texte imprimé Auteurs : Sudipta Chakraborty, Auteur ; Simoes M.G., Auteur Année de publication : 2010 Article en page(s) : pp. 673 - 682 Note générale : Energy Conversion Langues : Anglais (eng) Mots-clés : Distribution  networks--Power  filters--Power  supply  quality Résumé : Population growth in the world along with rapid technological expansion of the society demand efficient, economically viable, and environment-friendly energy conversion systems. The previous theoretical and simulation works have demonstrated that a 500-Hz single-phase high-frequency ac (HFAC) microgrid is a novel step toward integrating renewable energy sources in a distributed generation system. This paper goes one step further in describing the practical implementation of HFAC microgrid with active filters for a small 1-kW system. The protection issues for both the source and series converters are also addressed in this paper by developing a new but simple protection scheme. In the experimental microgrid system, a universal active power line conditioner (UPLC) and a unified power quality conditioner (UPQC) are incorporated to control the power flow and power quality, respectively. Controllers for both the UPQC and UPLC are developed based on the instantaneous single-phase p-q theory, and controlled pulsewidth modulated inverters are then implemented to synthesize the desired compensating waveforms. The experimental results obtained confirm that the HFAC microgrid is a practical and useful step toward successfully integrating distributed renewable energy sources ensuring the improved system utilization. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5071240&sortType%3Das [...] [article] Experimental evaluation of active filtering in a single-phase high-frequency AC microgrid [texte imprimé] / Sudipta Chakraborty, Auteur ; Simoes M.G., Auteur . - 2010 . - pp. 673 - 682. Energy Conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 673 - 682 Mots-clés : Distribution  networks--Power  filters--Power  supply  quality Résumé : Population growth in the world along with rapid technological expansion of the society demand efficient, economically viable, and environment-friendly energy conversion systems. The previous theoretical and simulation works have demonstrated that a 500-Hz single-phase high-frequency ac (HFAC) microgrid is a novel step toward integrating renewable energy sources in a distributed generation system. This paper goes one step further in describing the practical implementation of HFAC microgrid with active filters for a small 1-kW system. The protection issues for both the source and series converters are also addressed in this paper by developing a new but simple protection scheme. In the experimental microgrid system, a universal active power line conditioner (UPLC) and a unified power quality conditioner (UPQC) are incorporated to control the power flow and power quality, respectively. Controllers for both the UPQC and UPLC are developed based on the instantaneous single-phase p-q theory, and controlled pulsewidth modulated inverters are then implemented to synthesize the desired compensating waveforms. The experimental results obtained confirm that the HFAC microgrid is a practical and useful step toward successfully integrating distributed renewable energy sources ensuring the improved system utilization. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5071240&sortType%3Das [...]

Adaptive grid-voltage sensorless control scheme for inverter-based distributed generation / Mohamed, Y.A.-R.I. in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 683 - 694 Titre : Adaptive grid-voltage sensorless control scheme for inverter-based distributed generation Type de document : texte imprimé Auteurs : Mohamed, Y.A.-R.I., Auteur ; Ehab F. El-Saadany, Auteur ; Salama, M.M.A., Auteur Année de publication : 2010 Article en page(s) : pp. 683 - 694 Note générale : Energy Conversion Langues : Anglais (eng) Mots-clés : PWM  invertors--Digital  control--Low-power  electronics--Power  control Résumé : This paper presents an adaptive grid-voltage sensorless control scheme for inverter-based distributed generation units based on an adaptive grid-interfacing model. An adaptive grid-interfacing model is proposed to estimate, in real time, the interfacing parameters seen by the inverter and the grid-voltage vector simultaneously. A reliable solution to the present nonlinear estimation problem is presented by combining a grid-voltage estimator with an interfacing parameter estimator in a parallel structure. Both estimators adjust the grid-interfacing model in a manner that minimizes the current error between the grid model and the actual current dynamics, which acts as a reference model. The estimated quantities are utilized within the inner high-bandwidth current control loop and the outer power controller to realize an adaptive grid-voltage sensorless interfacing scheme. Theoretical analysis and simulation results are provided to demonstrate the validity and usefulness of the proposed interfacing scheme. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5075661&sortType%3Das [...] [article] Adaptive grid-voltage sensorless control scheme for inverter-based distributed generation [texte imprimé] / Mohamed, Y.A.-R.I., Auteur ; Ehab F. El-Saadany, Auteur ; Salama, M.M.A., Auteur . - 2010 . - pp. 683 - 694. Energy Conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 683 - 694 Mots-clés : PWM  invertors--Digital  control--Low-power  electronics--Power  control Résumé : This paper presents an adaptive grid-voltage sensorless control scheme for inverter-based distributed generation units based on an adaptive grid-interfacing model. An adaptive grid-interfacing model is proposed to estimate, in real time, the interfacing parameters seen by the inverter and the grid-voltage vector simultaneously. A reliable solution to the present nonlinear estimation problem is presented by combining a grid-voltage estimator with an interfacing parameter estimator in a parallel structure. Both estimators adjust the grid-interfacing model in a manner that minimizes the current error between the grid model and the actual current dynamics, which acts as a reference model. The estimated quantities are utilized within the inner high-bandwidth current control loop and the outer power controller to realize an adaptive grid-voltage sensorless interfacing scheme. Theoretical analysis and simulation results are provided to demonstrate the validity and usefulness of the proposed interfacing scheme. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5075661&sortType%3Das [...]

Z-source-inverter-based flexible distributed generation system solution for grid power quality improvement / Gajanayake, C.J. in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 695 - 704 Titre : Z-source-inverter-based flexible distributed generation system solution for grid power quality improvement Type de document : texte imprimé Auteurs : Gajanayake, C.J., Auteur ; Vilathgamuwa, D. M., Auteur ; Poh Chiang Loh, Auteur Année de publication : 2010 Article en page(s) : pp. 695 - 704 Note générale : Energy Conversion Langues : Anglais (eng) Mots-clés : Control  system  synthesis--Distributed  power  generation--Invertors--Power  convertors--Power  grids--Power--supply  quality Résumé : Distributed generation (DG) systems are usually connected to the grid using power electronic converters. Power delivered from such DG sources depends on factors like energy availability and load demand. The converters used in power conversion do not operate with their full capacity all the time. The unused or remaining capacity of the converters could be used to provide some ancillary functions like harmonic and unbalance mitigation of the power distribution system. As some of these DG sources have wide operating ranges, they need special power converters for grid interfacing. Being a single-stage buck-boost inverter, recently proposed Z-source inverter (ZSI) is a good candidate for future DG systems. This paper presents a controller design for a ZSI-based DG system to improve power quality of distribution systems. The proposed control method is tested with simulation results obtained using Matlab/Simulink/PLECS and subsequently it is experimentally validated using a laboratory prototype. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5224017&sortType%3Das [...] [article] Z-source-inverter-based flexible distributed generation system solution for grid power quality improvement [texte imprimé] / Gajanayake, C.J., Auteur ; Vilathgamuwa, D. M., Auteur ; Poh Chiang Loh, Auteur . - 2010 . - pp. 695 - 704. Energy Conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 695 - 704 Mots-clés : Control  system  synthesis--Distributed  power  generation--Invertors--Power  convertors--Power  grids--Power--supply  quality Résumé : Distributed generation (DG) systems are usually connected to the grid using power electronic converters. Power delivered from such DG sources depends on factors like energy availability and load demand. The converters used in power conversion do not operate with their full capacity all the time. The unused or remaining capacity of the converters could be used to provide some ancillary functions like harmonic and unbalance mitigation of the power distribution system. As some of these DG sources have wide operating ranges, they need special power converters for grid interfacing. Being a single-stage buck-boost inverter, recently proposed Z-source inverter (ZSI) is a good candidate for future DG systems. This paper presents a controller design for a ZSI-based DG system to improve power quality of distribution systems. The proposed control method is tested with simulation results obtained using Matlab/Simulink/PLECS and subsequently it is experimentally validated using a laboratory prototype. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5224017&sortType%3Das [...]

Maximum power tracking control for a wind turbine system including a matrix converter / Barakati S.M in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 705 - 713 Titre : Maximum power tracking control for a wind turbine system including a matrix converter Type de document : texte imprimé Auteurs : Barakati S.M, Auteur ; Kazerani Mehrdad, Auteur ; Aplevich J.Dwight, Auteur Année de publication : 2010 Article en page(s) : pp. 705 - 713 Note générale : Energy Conversion Langues : Anglais (eng) Mots-clés : Asynchronous  generators--Matrix  convertors--Power  conversion--Wind  turbines Résumé : This paper focuses on maximum wind power extraction for a wind energy conversion system composed of a wind turbine, a squirrel-cage induction generator, and a matrix converter (MC). At a given wind velocity, the mechanical power available from a wind turbine is a function of its shaft speed. In order to track maximum power, the MC adjusts the induction generator terminal frequency, and thus, the turbine shaft speed. The MC also adjusts the reactive power transfer at the grid interface toward voltage regulation or power factor correction. A maximum power point tracking (MPPT) algorithm is included in the control system. Conclusions about the effectiveness of the proposed scheme are supported by analysis and simulation results. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5075576&sortType%3Das [...] [article] Maximum power tracking control for a wind turbine system including a matrix converter [texte imprimé] / Barakati S.M, Auteur ; Kazerani Mehrdad, Auteur ; Aplevich J.Dwight, Auteur . - 2010 . - pp. 705 - 713. Energy Conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 705 - 713 Mots-clés : Asynchronous  generators--Matrix  convertors--Power  conversion--Wind  turbines Résumé : This paper focuses on maximum wind power extraction for a wind energy conversion system composed of a wind turbine, a squirrel-cage induction generator, and a matrix converter (MC). At a given wind velocity, the mechanical power available from a wind turbine is a function of its shaft speed. In order to track maximum power, the MC adjusts the induction generator terminal frequency, and thus, the turbine shaft speed. The MC also adjusts the reactive power transfer at the grid interface toward voltage regulation or power factor correction. A maximum power point tracking (MPPT) algorithm is included in the control system. Conclusions about the effectiveness of the proposed scheme are supported by analysis and simulation results. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5075576&sortType%3Das [...]

A new variable-speed wind energy conversion system using permanent-magnet synchronous generator and Z -source inverter / Dehghan S.M in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 714 - 724 Titre : A new variable-speed wind energy conversion system using permanent-magnet synchronous generator and Z -source inverter Type de document : texte imprimé Auteurs : Dehghan S.M, Auteur ; Mohamadian, M., Auteur ; Varjani, A.Y, Auteur Année de publication : 2010 Article en page(s) : pp. 714 - 724 Note générale : Energy Conversion Langues : Anglais (eng) Mots-clés : Invertors--Permanent  magnet  generators--Power  conversion--Power  grids--Synchronous  generators--Voltage  control-Wind  power Résumé : With the growth of wind energy conversion systems (WECSs), various technologies are developed for them. Permanent-magnet synchronous generators (PMSGs) are used by these technologies due to special characteristics of PMSGs such as low weight and volume, high performance, and the elimination of the gearbox. In this paper, a new variable-speed WECS with a PMSG and Z-source inverter is proposed. Characteristics of Z-source inverter are used for maximum power tracking control and delivering power to the grid, simultaneously. Two control methods are proposed for delivering power to the grid: Capacitor voltage control and dc-link voltage control. Operation of system with these methods is compared from the viewpoint of power quality and total switching device power (TSDP). In addition, TSDP, current ripple of inductor, performance, and total harmonic distortion of grid current of proposed system is compared with traditional wind energy system with a boost converter. Published in: Note de contenu : Bbibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5071242&sortType%3Das [...] [article] A new variable-speed wind energy conversion system using permanent-magnet synchronous generator and Z -source inverter [texte imprimé] / Dehghan S.M, Auteur ; Mohamadian, M., Auteur ; Varjani, A.Y, Auteur . - 2010 . - pp. 714 - 724. Energy Conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 714 - 724 Mots-clés : Invertors--Permanent  magnet  generators--Power  conversion--Power  grids--Synchronous  generators--Voltage  control-Wind  power Résumé : With the growth of wind energy conversion systems (WECSs), various technologies are developed for them. Permanent-magnet synchronous generators (PMSGs) are used by these technologies due to special characteristics of PMSGs such as low weight and volume, high performance, and the elimination of the gearbox. In this paper, a new variable-speed WECS with a PMSG and Z-source inverter is proposed. Characteristics of Z-source inverter are used for maximum power tracking control and delivering power to the grid, simultaneously. Two control methods are proposed for delivering power to the grid: Capacitor voltage control and dc-link voltage control. Operation of system with these methods is compared from the viewpoint of power quality and total switching device power (TSDP). In addition, TSDP, current ripple of inductor, performance, and total harmonic distortion of grid current of proposed system is compared with traditional wind energy system with a boost converter. Published in: Note de contenu : Bbibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5071242&sortType%3Das [...]

Control strategies for battery energy storage for wind farm dispatching / Teleke, S. in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 725 - 732 Titre : Control strategies for battery energy storage for wind farm dispatching Type de document : texte imprimé Auteurs : Teleke, S., Auteur ; Baran, M.E., Auteur ; Huang, A.Q., Auteur Année de publication : 2010 Article en page(s) : pp. 725 - 732 Note générale : Energy Conversion Langues : Anglais (eng) Mots-clés : Battery  storage  plants--Energy  storage--Wind  power  plants Résumé : Integrating a battery energy storage system (BESS) with a large wind farm can smooth out the intermittent power from the wind farm. This paper focuses on development of a control strategy for optimal use of the BESS for this purpose. The paper considers a conventional feedback-based control scheme with revisions to incorporate the operating constraints of the BESS, such as state of charge limits, charge/discharge rate, and lifetime. The goal of the control is to have the BESS provide as much smoothing as possible so that the wind farm can be dispatched on an hourly basis based on the forecasted wind conditions. The effectiveness of this control strategy has been tested by using an actual wind farm data. Finally, it is shown that the control strategy is very important in determining the proper BESS size needed for this application. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5071241&sortType%3Das [...] [article] Control strategies for battery energy storage for wind farm dispatching [texte imprimé] / Teleke, S., Auteur ; Baran, M.E., Auteur ; Huang, A.Q., Auteur . - 2010 . - pp. 725 - 732. Energy Conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 725 - 732 Mots-clés : Battery  storage  plants--Energy  storage--Wind  power  plants Résumé : Integrating a battery energy storage system (BESS) with a large wind farm can smooth out the intermittent power from the wind farm. This paper focuses on development of a control strategy for optimal use of the BESS for this purpose. The paper considers a conventional feedback-based control scheme with revisions to incorporate the operating constraints of the BESS, such as state of charge limits, charge/discharge rate, and lifetime. The goal of the control is to have the BESS provide as much smoothing as possible so that the wind farm can be dispatched on an hourly basis based on the forecasted wind conditions. The effectiveness of this control strategy has been tested by using an actual wind farm data. Finally, it is shown that the control strategy is very important in determining the proper BESS size needed for this application. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5071241&sortType%3Das [...]

Probabilistic evaluation of transient stability of a wind farm / S. O. Faried in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 733 - 739 Titre : Probabilistic evaluation of transient stability of a wind farm Type de document : texte imprimé Auteurs : S. O. Faried, Auteur ; Billinton, R., Auteur ; Aboreshaid S, Auteur Année de publication : 2010 Article en page(s) : pp. 733 - 739 Note générale : Energy Conversion Langues : Anglais (eng) Mots-clés : EMTP--power  system--transient  stability--Time-domain  analysis--Wind  power  plants Résumé : This paper presents a probabilistic-based approach to evaluate transient stability of a wind farm. In this context, investigations have been conducted on a hypothetical system representing a typical wind farm taking into consideration the uncertainty of several factors associated with the practical operation of a power system. A risk index that reflects the likelihood that the wind farm encounters an instability problem is presented. The time domain simulations are obtained using the electromagnetic transient program (EMTP). Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5071243&sortType%3Das [...] [article] Probabilistic evaluation of transient stability of a wind farm [texte imprimé] / S. O. Faried, Auteur ; Billinton, R., Auteur ; Aboreshaid S, Auteur . - 2010 . - pp. 733 - 739. Energy Conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 733 - 739 Mots-clés : EMTP--power  system--transient  stability--Time-domain  analysis--Wind  power  plants Résumé : This paper presents a probabilistic-based approach to evaluate transient stability of a wind farm. In this context, investigations have been conducted on a hypothetical system representing a typical wind farm taking into consideration the uncertainty of several factors associated with the practical operation of a power system. A risk index that reflects the likelihood that the wind farm encounters an instability problem is presented. The time domain simulations are obtained using the electromagnetic transient program (EMTP). Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5071243&sortType%3Das [...]

Integration of an energy capacitor system With a variable-speed wind generator / Muyeen S.M in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 740 - 749 Titre : Integration of an energy capacitor system With a variable-speed wind generator Type de document : texte imprimé Auteurs : Muyeen S.M, Auteur ; Takahashi, Rion, Auteur ; Murata, Toshiaki, Auteur Année de publication : 2010 Article en page(s) : pp. 740 - 749 Note générale : Energy Conversion Langues : Anglais (eng) Mots-clés : DC-DC  power  convertors--Frequency  convertors--Fuzzy  logic--Permanent  magnet  generators--Power  capacitors--Synchronous  generators--Wind  power  plants--Wind  turbines Résumé : This paper presents a system using an energy capacitor system (ECS) to smoothen the output power fluctuation of a variable-speed wind farm. The variable-speed wind turbine driving a permanent-magnet synchronous generator is considered to be connected to the ac network through a fully controlled frequency converter. The detailed modeling and control strategy of the frequency converter as well as variable-speed operation of a wind turbine generator system are demonstrated. Afterward, a suitable and economical topology of ECS composed of a current-controlled voltage-source inverter, dc-dc buck/boost converter, and an electric double layer capacitor (EDLC) bank is presented, including their control strategies. Exponential moving average is used to generate the real input power reference of ECS. Another novel feature of this paper is the incorporation of a fuzzy-logic-controlled reference signal adjuster in the control of the dc-dc buck/boost converter, in which the stored energy of the EDLC bank is utilized in an efficient way. Due to this controller, the energy storage capacity of the EDLC bank can be reduced in size, thus resulting in reduction of the overall cost of the ECS unit as well as decrease in irrepressible operations during high and low energy levels of the EDLC bank. Finally, extensive simulation results are presented that validate the effectiveness of the proposed system to smoothen the output power fluctuation of the variable-speed wind farm. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5224011&sortType%3Das [...] [article] Integration of an energy capacitor system With a variable-speed wind generator [texte imprimé] / Muyeen S.M, Auteur ; Takahashi, Rion, Auteur ; Murata, Toshiaki, Auteur . - 2010 . - pp. 740 - 749. Energy Conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 740 - 749 Mots-clés : DC-DC  power  convertors--Frequency  convertors--Fuzzy  logic--Permanent  magnet  generators--Power  capacitors--Synchronous  generators--Wind  power  plants--Wind  turbines Résumé : This paper presents a system using an energy capacitor system (ECS) to smoothen the output power fluctuation of a variable-speed wind farm. The variable-speed wind turbine driving a permanent-magnet synchronous generator is considered to be connected to the ac network through a fully controlled frequency converter. The detailed modeling and control strategy of the frequency converter as well as variable-speed operation of a wind turbine generator system are demonstrated. Afterward, a suitable and economical topology of ECS composed of a current-controlled voltage-source inverter, dc-dc buck/boost converter, and an electric double layer capacitor (EDLC) bank is presented, including their control strategies. Exponential moving average is used to generate the real input power reference of ECS. Another novel feature of this paper is the incorporation of a fuzzy-logic-controlled reference signal adjuster in the control of the dc-dc buck/boost converter, in which the stored energy of the EDLC bank is utilized in an efficient way. Due to this controller, the energy storage capacity of the EDLC bank can be reduced in size, thus resulting in reduction of the overall cost of the ECS unit as well as decrease in irrepressible operations during high and low energy levels of the EDLC bank. Finally, extensive simulation results are presented that validate the effectiveness of the proposed system to smoothen the output power fluctuation of the variable-speed wind farm. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5224011&sortType%3Das [...]

Wind energy analysis for vadravadra site in fiji islands: / Prasad Ravita.D in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 750 - 757 Titre : Wind energy analysis for vadravadra site in fiji islands: : a case study Type de document : texte imprimé Auteurs : Prasad Ravita.D, Auteur ; Bansal, R. C., Auteur ; Sauturaga M., Auteur Année de publication : 2010 Article en page(s) : pp. 750 - 757 Note générale : Energy Conversion Langues : Anglais (eng) Mots-clés : Energy  consumption--Wind  power--Wind  turbines Résumé : Rising fuel costs, increased energy consumption, and growing environmental concerns have led mankind to look for alternate sources of energy apart from conventional fuels. One of the promising renewable energy sources is wind energy. For harnessing wind energy from a wind turbine or wind farm, wind resource assessment (WRA) needs to be carried out. WRA will highlight which site is optimum (in terms of economics and wind characteristics) for wind turbine installation and how much would be the estimated energy output from that particular site. This paper presents the estimate for annual wind energy yield for the Vadravadra site in Gau Island in Fiji. It also presents a method for finding the optimum wind turbine that can be installed at a site and the kind of wind turbine that should be installed at a site, where cyclone may hit the area. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5224015&sortType%3Das [...] [article] Wind energy analysis for vadravadra site in fiji islands: : a case study [texte imprimé] / Prasad Ravita.D, Auteur ; Bansal, R. C., Auteur ; Sauturaga M., Auteur . - 2010 . - pp. 750 - 757. Energy Conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 750 - 757 Mots-clés : Energy  consumption--Wind  power--Wind  turbines Résumé : Rising fuel costs, increased energy consumption, and growing environmental concerns have led mankind to look for alternate sources of energy apart from conventional fuels. One of the promising renewable energy sources is wind energy. For harnessing wind energy from a wind turbine or wind farm, wind resource assessment (WRA) needs to be carried out. WRA will highlight which site is optimum (in terms of economics and wind characteristics) for wind turbine installation and how much would be the estimated energy output from that particular site. This paper presents the estimate for annual wind energy yield for the Vadravadra site in Gau Island in Fiji. It also presents a method for finding the optimum wind turbine that can be installed at a site and the kind of wind turbine that should be installed at a site, where cyclone may hit the area. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5224015&sortType%3Das [...]

Rotor position phase-locked loop for decoupled P\hbox {-}Q control of DFIG for wind power generation / Mwinyiwiwa Bakari in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 758 - 765 Titre : Rotor position phase-locked loop for decoupled P\hbox {-}Q control of DFIG for wind power generation Type de document : texte imprimé Auteurs : Mwinyiwiwa Bakari, Auteur ; Yongzheng Zhang, Auteur ; Shen Baike, Auteur Année de publication : 2010 Article en page(s) : pp. 758 - 765 Note générale : Energy Conversion Langues : Anglais (eng) Mots-clés : Asynchronous  generators--Phase  locked  loops--Power  control--Rotors--Wind  power--Wind  turbines Résumé : Implementation of decoupled P-Q control of doubly fed induction generators requires the positions of the rotors to be known. The rotor position phase-lock loop (PLL) is an invention that extracts rotor position and speed simultaneously by ¿sensorless¿ means. The rotor position PLL is parameter-insensitive because, apart from an approximate value of the magnetization reactance, knowledge of the other parameters is not required for it to function. Experimental results obtained under noisy conditions demonstrate that it is also insensitive to noise. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5224010&sortType%3Das [...] [article] Rotor position phase-locked loop for decoupled P\hbox {-}Q control of DFIG for wind power generation [texte imprimé] / Mwinyiwiwa Bakari, Auteur ; Yongzheng Zhang, Auteur ; Shen Baike, Auteur . - 2010 . - pp. 758 - 765. Energy Conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 758 - 765 Mots-clés : Asynchronous  generators--Phase  locked  loops--Power  control--Rotors--Wind  power--Wind  turbines Résumé : Implementation of decoupled P-Q control of doubly fed induction generators requires the positions of the rotors to be known. The rotor position phase-lock loop (PLL) is an invention that extracts rotor position and speed simultaneously by ¿sensorless¿ means. The rotor position PLL is parameter-insensitive because, apart from an approximate value of the magnetization reactance, knowledge of the other parameters is not required for it to function. Experimental results obtained under noisy conditions demonstrate that it is also insensitive to noise. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5224010&sortType%3Das [...]

Anticipatory control of wind turbines with data-driven predictive models / Andrew Kusiak in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 766 - 774 Titre : Anticipatory control of wind turbines with data-driven predictive models Type de document : texte imprimé Auteurs : Andrew Kusiak, Auteur ; Zhe, Song, Auteur ; Haiyang, Zheng, Auteur Année de publication : 2010 Article en page(s) : pp. 766 - 774 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Data  mining;  optimisation;  predictive  control;  rotors;  wind  turbines Résumé : The concept of anticipatory control applied to wind turbines is presented. Anticipatory control is based on the model predictive control (MPC) approach. Unlike the MPC method, noncontrollable variables (such as wind speed) are directly considered in the dynamic equations presented in the paper to predict response variables, e.g., rotor speed and turbine power output. To determine future states of the power drive with the dynamic equations, a time series model was built for wind speed. The time series model was fused with the dynamic equations to predict the response variables over a certain prediction horizon. Based on these predictions, an optimization model was solved to find the optimal control settings to improve the power output without incurring large rotor speed changes. As both the dynamic equations and time series model were built by data mining algorithms, no gradient information is available. A modified evolutionary strategy algorithm was used to solve a nonlinear constrained optimization problem. The proposed approach has been tested on the data collected from a 1.5 MW wind turbine. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5224019&sortType%3Das [...] [article] Anticipatory control of wind turbines with data-driven predictive models [texte imprimé] / Andrew Kusiak, Auteur ; Zhe, Song, Auteur ; Haiyang, Zheng, Auteur . - 2010 . - pp. 766 - 774. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 766 - 774 Mots-clés : Data  mining;  optimisation;  predictive  control;  rotors;  wind  turbines Résumé : The concept of anticipatory control applied to wind turbines is presented. Anticipatory control is based on the model predictive control (MPC) approach. Unlike the MPC method, noncontrollable variables (such as wind speed) are directly considered in the dynamic equations presented in the paper to predict response variables, e.g., rotor speed and turbine power output. To determine future states of the power drive with the dynamic equations, a time series model was built for wind speed. The time series model was fused with the dynamic equations to predict the response variables over a certain prediction horizon. Based on these predictions, an optimization model was solved to find the optimal control settings to improve the power output without incurring large rotor speed changes. As both the dynamic equations and time series model were built by data mining algorithms, no gradient information is available. A modified evolutionary strategy algorithm was used to solve a nonlinear constrained optimization problem. The proposed approach has been tested on the data collected from a 1.5 MW wind turbine. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5224019&sortType%3Das [...]

Wind power density forecasting using ensemble predictions and time series models / James W. Taylor in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 775 - 782 Titre : Wind power density forecasting using ensemble predictions and time series models Type de document : texte imprimé Auteurs : James W. Taylor, Auteur ; McSharry, Patrick E., Auteur ; Buizza, Roberto, Auteur Année de publication : 2010 Article en page(s) : pp. 775 - 782 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Time  series;  wind  power Résumé : Wind power is an increasingly used form of renewable energy. The uncertainty in wind generation is very large due to the inherent variability in wind speed, and this needs to be understood by operators of power systems and wind farms. To assist with the management of this risk, this paper investigates methods for predicting the probability density function of generated wind power from one to ten days ahead at five U.K. wind farm locations. These density forecasts provide a description of the expected future value and the associated uncertainty. We construct density forecasts from weather ensemble predictions, which are a relatively new type of weather forecast generated from atmospheric models. We also consider density forecasting from statistical time series models. The best results for wind power density prediction and point forecasting were produced by an approach that involves calibration and smoothing of the ensemble-based wind power density. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5224014&sortType%3Das [...] [article] Wind power density forecasting using ensemble predictions and time series models [texte imprimé] / James W. Taylor, Auteur ; McSharry, Patrick E., Auteur ; Buizza, Roberto, Auteur . - 2010 . - pp. 775 - 782. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 775 - 782 Mots-clés : Time  series;  wind  power Résumé : Wind power is an increasingly used form of renewable energy. The uncertainty in wind generation is very large due to the inherent variability in wind speed, and this needs to be understood by operators of power systems and wind farms. To assist with the management of this risk, this paper investigates methods for predicting the probability density function of generated wind power from one to ten days ahead at five U.K. wind farm locations. These density forecasts provide a description of the expected future value and the associated uncertainty. We construct density forecasts from weather ensemble predictions, which are a relatively new type of weather forecast generated from atmospheric models. We also consider density forecasting from statistical time series models. The best results for wind power density prediction and point forecasting were produced by an approach that involves calibration and smoothing of the ensemble-based wind power density. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5224014&sortType%3Das [...]

Contribution of doubly fed wind generators to oscillation damping / Tsourakis, Georgios in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 783 - 791 Titre : Contribution of doubly fed wind generators to oscillation damping Type de document : texte imprimé Auteurs : Tsourakis, Georgios, Auteur ; Nomikos, Basil M., Auteur ; Vournas, Costas D., Auteur Année de publication : 2010 Article en page(s) : pp. 783 - 791 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Power  system  stability;  wind  power;  wind  turbines Résumé : In this paper, the effects of increased wind power penetration by doubly fed asynchronous generators (DFAGs) on oscillation damping are investigated. With the help of an illustrative example, it is shown that the general trend for DFAGs is to increase interarea oscillation damping. However, there are exceptions for certain penetration levels (not necessarily large), for which the voltage control (VC) option of DFAGs can reduce damping. It is also shown that the modulation of active power generation of wind turbines is a powerful tool to introduce additional damping to interarea oscillations through a simple wind power system stabilizer design. The general trend for increased oscillation damping is verified in the case of a large interconnected system encompassing Southeastern Europe for a projected high level of wind penetration in Greece. For the same system, it is also shown that low-damping voltage oscillations possibly introduced by the VC mode of DFAGs can be adequately damped by properly adjusting control parameters. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5196795&sortType%3Das [...] [article] Contribution of doubly fed wind generators to oscillation damping [texte imprimé] / Tsourakis, Georgios, Auteur ; Nomikos, Basil M., Auteur ; Vournas, Costas D., Auteur . - 2010 . - pp. 783 - 791. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 783 - 791 Mots-clés : Power  system  stability;  wind  power;  wind  turbines Résumé : In this paper, the effects of increased wind power penetration by doubly fed asynchronous generators (DFAGs) on oscillation damping are investigated. With the help of an illustrative example, it is shown that the general trend for DFAGs is to increase interarea oscillation damping. However, there are exceptions for certain penetration levels (not necessarily large), for which the voltage control (VC) option of DFAGs can reduce damping. It is also shown that the modulation of active power generation of wind turbines is a powerful tool to introduce additional damping to interarea oscillations through a simple wind power system stabilizer design. The general trend for increased oscillation damping is verified in the case of a large interconnected system encompassing Southeastern Europe for a projected high level of wind penetration in Greece. For the same system, it is also shown that low-damping voltage oscillations possibly introduced by the VC mode of DFAGs can be adequately damped by properly adjusting control parameters. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5196795&sortType%3Das [...]

A reliability model of large wind farms for power system adequacy studies / Dobakhshari, Ahmad Salhi in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 792 - 801 Titre : A reliability model of large wind farms for power system adequacy studies Type de document : texte imprimé Auteurs : Dobakhshari, Ahmad Salhi, Auteur ; Fotuhi-Firuzabad, Mahmud, Auteur Année de publication : 2010 Article en page(s) : pp. 792 - 801 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Power  system  reliability;  power  system  simulation;  statistical  analysis;  wind  power  plants Résumé : In this paper, an analytical approach for the reliability modeling of large wind farms is presented. A systematic method based on frequency and duration approach is utilized to model a wind farm like a multistate conventional unit, where the probability, frequency of occurrence, and departure rate of each state can be obtained using the regional wind regime of wind farm and wind turbine characteristics. The proposed method is capable of finding both annual frequency and average time of load curtailment analytically in the presence of wind power. A wind farm in the northern region of Iran with the wind speed registration of one year is studied in this paper. To accommodate time-varying patterns of wind speed, reliability analysis considering seasonal patterns of wind speed is also carried out. The results show that seasonal patterns significantly affect the reliability indexes. A reliability analysis is also performed using a load profile similar to that of Iran power network. It will be shown that the coincidence of high-load-demand and high-wind-speed periods makes the North Iran wind farm projects highly attractive from a reliability point of view. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5224024&sortType%3Das [...] [article] A reliability model of large wind farms for power system adequacy studies [texte imprimé] / Dobakhshari, Ahmad Salhi, Auteur ; Fotuhi-Firuzabad, Mahmud, Auteur . - 2010 . - pp. 792 - 801. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 792 - 801 Mots-clés : Power  system  reliability;  power  system  simulation;  statistical  analysis;  wind  power  plants Résumé : In this paper, an analytical approach for the reliability modeling of large wind farms is presented. A systematic method based on frequency and duration approach is utilized to model a wind farm like a multistate conventional unit, where the probability, frequency of occurrence, and departure rate of each state can be obtained using the regional wind regime of wind farm and wind turbine characteristics. The proposed method is capable of finding both annual frequency and average time of load curtailment analytically in the presence of wind power. A wind farm in the northern region of Iran with the wind speed registration of one year is studied in this paper. To accommodate time-varying patterns of wind speed, reliability analysis considering seasonal patterns of wind speed is also carried out. The results show that seasonal patterns significantly affect the reliability indexes. A reliability analysis is also performed using a load profile similar to that of Iran power network. It will be shown that the coincidence of high-load-demand and high-wind-speed periods makes the North Iran wind farm projects highly attractive from a reliability point of view. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5224024&sortType%3Das [...]

Comparison of IEEE 112 and new IEC standard 60034-2-1 / Wenping, Cao in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 802 - 808 Titre : Comparison of IEEE 112 and new IEC standard 60034-2-1 Type de document : texte imprimé Auteurs : Wenping, Cao, Auteur Année de publication : 2010 Article en page(s) : pp. 802 - 808 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : IEC  standards;  IEEE  standards;  induction  motors;  machine  testing Résumé : This paper describes a comparative study of induction motor testing standards IEEE 112 and newly published IEC 60034-2-1, primarily used in the United States and Europe, respectively. IEC 60034-2-1 has been refined from its earlier version IEC 60034-2 with reference to the IEEE 112. Six induction motors are tested following the two standards and the results are compared with regard to their instrumental accuracy and testing procedures. Power loss results are validated by the calorimetric method. A quantitative method is devised to evaluate the measurement uncertainty that can be interpreted into an efficiency deviation by quadrature addition. This paper is aimed to provide a guideline on interpreting the measured machine efficiency values using these standards and to validate the new IEC standard. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5196794&sortType%3Das [...] [article] Comparison of IEEE 112 and new IEC standard 60034-2-1 [texte imprimé] / Wenping, Cao, Auteur . - 2010 . - pp. 802 - 808. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 802 - 808 Mots-clés : IEC  standards;  IEEE  standards;  induction  motors;  machine  testing Résumé : This paper describes a comparative study of induction motor testing standards IEEE 112 and newly published IEC 60034-2-1, primarily used in the United States and Europe, respectively. IEC 60034-2-1 has been refined from its earlier version IEC 60034-2 with reference to the IEEE 112. Six induction motors are tested following the two standards and the results are compared with regard to their instrumental accuracy and testing procedures. Power loss results are validated by the calorimetric method. A quantitative method is devised to evaluate the measurement uncertainty that can be interpreted into an efficiency deviation by quadrature addition. This paper is aimed to provide a guideline on interpreting the measured machine efficiency values using these standards and to validate the new IEC standard. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5196794&sortType%3Das [...]

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