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Ajouter le résultat dans votre panierOverload considerations for design and operation of IPMSMs / Tariq, A. R. in IEEE transactions on energy conversion, Vol. 25, N° 4 (Décembre 2010)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - P. 921 - 930
Titre : Overload considerations for design and operation of IPMSMs Type de document : texte imprimé Auteurs : Tariq, A. R., Auteur ; Nino-Baron, C. E., Auteur ; Strangas, E. G., Auteur Année de publication : 2011 Article en page(s) : P. 921 - 930 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Permanent magnet machines; stators; synchronous machines Résumé : Although interior permanent magnet synchronous machines and their cooling are designed to match the rated power, power demands other than rated may arise. One may keep the same machine dimensions and basic electromagnetic design, but increase the cooling for different operating conditions. Modifications of the cooling system can compensate for the increase in machine losses in the windings, magnets, or iron. Increasing the allowed stator current affects the machine performance in other ways as well. These include demagnetization of the magnets, and hence, shrinking of the speed range to avoid this. In this paper, these effects are studied for a baseline machine, as well as for machines with the same stator but modified rotor design. A cross-saturated model is developed and shown to be more accurate than the classic one. To account for higher stator current with higher temperatures, the effects on efficiency, torque, and speed range by changing the magnet material from the more commonly used NdFeB to SmCo are also studied and discussed. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5530366&sortType%3Das [...] [article] Overload considerations for design and operation of IPMSMs [texte imprimé] / Tariq, A. R., Auteur ; Nino-Baron, C. E., Auteur ; Strangas, E. G., Auteur . - 2011 . - P. 921 - 930.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - P. 921 - 930
Mots-clés : Permanent magnet machines; stators; synchronous machines Résumé : Although interior permanent magnet synchronous machines and their cooling are designed to match the rated power, power demands other than rated may arise. One may keep the same machine dimensions and basic electromagnetic design, but increase the cooling for different operating conditions. Modifications of the cooling system can compensate for the increase in machine losses in the windings, magnets, or iron. Increasing the allowed stator current affects the machine performance in other ways as well. These include demagnetization of the magnets, and hence, shrinking of the speed range to avoid this. In this paper, these effects are studied for a baseline machine, as well as for machines with the same stator but modified rotor design. A cross-saturated model is developed and shown to be more accurate than the classic one. To account for higher stator current with higher temperatures, the effects on efficiency, torque, and speed range by changing the magnet material from the more commonly used NdFeB to SmCo are also studied and discussed. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5530366&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 931 - 939
Titre : Estimation of hydropower generator parameters through field simulations of standard tests Type de document : texte imprimé Auteurs : Lidenholm, J., Auteur ; Lundin, U., Auteur Année de publication : 2011 Article en page(s) : pp. 931 - 939 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Finite element analysis; hydroelectric power stations; synchronous generators Résumé : Four standard test procedures-the three phase short-circuit test , the field decrement test, the slip test, and the applied voltage test-for estimation of synchronous generator parameters have been implemented in a time-stepping finite-element software. In this paper, the main features of the implementation and the postprocessing of data are described. The validity of the application is demonstrated by comparison with test results from the commissioning of a large hydropower generator. The method is shown to be effective in estimating most parameters. Better representation of the exciter and the interpole connections of the damper circuit is believed to enhance the compliance even further. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5623337&sortType%3Das [...] [article] Estimation of hydropower generator parameters through field simulations of standard tests [texte imprimé] / Lidenholm, J., Auteur ; Lundin, U., Auteur . - 2011 . - pp. 931 - 939.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 931 - 939
Mots-clés : Finite element analysis; hydroelectric power stations; synchronous generators Résumé : Four standard test procedures-the three phase short-circuit test , the field decrement test, the slip test, and the applied voltage test-for estimation of synchronous generator parameters have been implemented in a time-stepping finite-element software. In this paper, the main features of the implementation and the postprocessing of data are described. The validity of the application is demonstrated by comparison with test results from the commissioning of a large hydropower generator. The method is shown to be effective in estimating most parameters. Better representation of the exciter and the interpole connections of the damper circuit is believed to enhance the compliance even further. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5623337&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 940 - 947
Titre : Analysis of flux-reversal machine based on fictitious electrical gear Type de document : texte imprimé Auteurs : More, D. S., Auteur ; Fernandes, B. G., Auteur Année de publication : 2011 Article en page(s) : pp. 940 - 947 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Fourier analysis; air gaps; magnetic flux; permanent magnet machines; poles and zeros; stators; synchronous machines Résumé : This paper proposes a concept of fictitious “Electrical Gear” to analyze the flux pattern in the three-phase flux-reversal machine (FRM). The rotating-flux pattern of FRM has either two or four poles depending on the number of stator poles. FRM can be analyzed on similar lines as permanent magnet synchronous machine with the concept of this gear. The flux-density distribution in FRM is analyzed with Fourier analysis. The magnitude of various space harmonics and their contribution to the winding-flux linkages are determined. The procedure for finding the rms value of air-gap flux density from machine dimensions is described. In order to verify the aforementioned analysis, a 6/14 pole FRM with distributed and concentrated windings is designed and fabricated. The experimental results are compared with those obtained from finite-element method simulation studies and analytical results. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5635304&sortType%3Das [...] [article] Analysis of flux-reversal machine based on fictitious electrical gear [texte imprimé] / More, D. S., Auteur ; Fernandes, B. G., Auteur . - 2011 . - pp. 940 - 947.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 940 - 947
Mots-clés : Fourier analysis; air gaps; magnetic flux; permanent magnet machines; poles and zeros; stators; synchronous machines Résumé : This paper proposes a concept of fictitious “Electrical Gear” to analyze the flux pattern in the three-phase flux-reversal machine (FRM). The rotating-flux pattern of FRM has either two or four poles depending on the number of stator poles. FRM can be analyzed on similar lines as permanent magnet synchronous machine with the concept of this gear. The flux-density distribution in FRM is analyzed with Fourier analysis. The magnitude of various space harmonics and their contribution to the winding-flux linkages are determined. The procedure for finding the rms value of air-gap flux density from machine dimensions is described. In order to verify the aforementioned analysis, a 6/14 pole FRM with distributed and concentrated windings is designed and fabricated. The experimental results are compared with those obtained from finite-element method simulation studies and analytical results. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5635304&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 948 - 956
Titre : A fast analytical model for an integrated switched reluctance starter/generator Type de document : texte imprimé Auteurs : Wen Ding, Auteur ; Deliang Liang, Auteur Année de publication : 2011 Article en page(s) : pp. 948 - 956 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Fourier series; magnetic flux; reluctance generators; torque Résumé : This paper presents a fast analytical modeling method for an integrated switched reluctance starter/generator (SRS/G). This method extends the basic theory of the Chi model and utilizes the first five components of Fourier series in expression of current-dependent arctangent function to express the whole flux linkage model of SRS/G, which could be built with only nine data points at five positions. Then the electromagnetic torque is further calculated from the proposed flux linkage model. The accuracy of the model is verified via comparison with measured flux linkage and torque data. Afterward, the details of simulation model for an integrated 6/4 SRS/G system are presented and the dynamic performances at starting-up and power generating states are predicted. Finally, more experimental results such as phase currents, output dc voltages at different operations and torque-speed characteristics for a 6/4 SRS/G based on a DSP drive platform are also presented to verify the accuracy and rapidity of the proposed method. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5535070&sortType%3Das [...] [article] A fast analytical model for an integrated switched reluctance starter/generator [texte imprimé] / Wen Ding, Auteur ; Deliang Liang, Auteur . - 2011 . - pp. 948 - 956.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 948 - 956
Mots-clés : Fourier series; magnetic flux; reluctance generators; torque Résumé : This paper presents a fast analytical modeling method for an integrated switched reluctance starter/generator (SRS/G). This method extends the basic theory of the Chi model and utilizes the first five components of Fourier series in expression of current-dependent arctangent function to express the whole flux linkage model of SRS/G, which could be built with only nine data points at five positions. Then the electromagnetic torque is further calculated from the proposed flux linkage model. The accuracy of the model is verified via comparison with measured flux linkage and torque data. Afterward, the details of simulation model for an integrated 6/4 SRS/G system are presented and the dynamic performances at starting-up and power generating states are predicted. Finally, more experimental results such as phase currents, output dc voltages at different operations and torque-speed characteristics for a 6/4 SRS/G based on a DSP drive platform are also presented to verify the accuracy and rapidity of the proposed method. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5535070&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 957 - 964
Titre : Evaluation of a bearingless PM motor with wide magnetic gaps Type de document : texte imprimé Auteurs : Asama, J., Auteur ; Amada, M., Auteur ; Tanabe, N., Auteur Année de publication : 2011 Article en page(s) : pp. 957 - 964 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Drives; finite element analysis; machine bearings; permanent magnet motors Résumé : A new noncontact drive system has been developed employing a consequent-pole-type bearingless permanent magnet (PM) motor and a thrust magnetic bearing. This bearingless motor has a wide magnetic gap. The wide magnetic gap may cause a decrease in radial magnetic suspension force because of an increase in magnetic reluctance. A thrust magnetic bearing is installed at the end of the shaft because strong thrust force exists in centrifugal pump applications. In this paper, the magnetic suspension forces and rotation characteristics of the experimental prototype are evaluated while the rotor is magnetically suspended. Experimental results are also compared to the calculated ones using the finite-element method. It is demonstrated that the developed consequent-pole-type bearingless PM motor possesses sufficient magnetic suspension force for noncontact operation. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5422659&sortType%3Das [...] [article] Evaluation of a bearingless PM motor with wide magnetic gaps [texte imprimé] / Asama, J., Auteur ; Amada, M., Auteur ; Tanabe, N., Auteur . - 2011 . - pp. 957 - 964.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 957 - 964
Mots-clés : Drives; finite element analysis; machine bearings; permanent magnet motors Résumé : A new noncontact drive system has been developed employing a consequent-pole-type bearingless permanent magnet (PM) motor and a thrust magnetic bearing. This bearingless motor has a wide magnetic gap. The wide magnetic gap may cause a decrease in radial magnetic suspension force because of an increase in magnetic reluctance. A thrust magnetic bearing is installed at the end of the shaft because strong thrust force exists in centrifugal pump applications. In this paper, the magnetic suspension forces and rotation characteristics of the experimental prototype are evaluated while the rotor is magnetically suspended. Experimental results are also compared to the calculated ones using the finite-element method. It is demonstrated that the developed consequent-pole-type bearingless PM motor possesses sufficient magnetic suspension force for noncontact operation. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5422659&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 965 - 973
Titre : A novel rotor ground-fault-detection technique for synchronous machines with static excitation Type de document : texte imprimé Auteurs : Gaona, C.A.P., Auteur ; Blàzquez, F., Auteur ; Frias, P., Auteur Année de publication : 2011 Article en page(s) : pp. 965 - 973 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Earthing; rotors; synchronous machines Résumé : This paper presents a novel ground-fault-detection technique for synchronous machines. This technique is suitable for synchronous machines with static excitation systems, whose excitation field winding is fed by rectifiers through an excitation transformer. The main contribution of this new technique is that it can detect and discriminate both ac- and dc-side ground faults in the excitation system, without the need for traditional power injection sources. This detection technique is based on the frequency analysis of the voltages or currents at a grounding impedance placed at the excitation transformer neutral terminal. This technique has been validated through computer simulations and experimental laboratory tests. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5477162&sortType%3Das [...] [article] A novel rotor ground-fault-detection technique for synchronous machines with static excitation [texte imprimé] / Gaona, C.A.P., Auteur ; Blàzquez, F., Auteur ; Frias, P., Auteur . - 2011 . - pp. 965 - 973.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 965 - 973
Mots-clés : Earthing; rotors; synchronous machines Résumé : This paper presents a novel ground-fault-detection technique for synchronous machines. This technique is suitable for synchronous machines with static excitation systems, whose excitation field winding is fed by rectifiers through an excitation transformer. The main contribution of this new technique is that it can detect and discriminate both ac- and dc-side ground faults in the excitation system, without the need for traditional power injection sources. This detection technique is based on the frequency analysis of the voltages or currents at a grounding impedance placed at the excitation transformer neutral terminal. This technique has been validated through computer simulations and experimental laboratory tests. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5477162&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp 974 - 982
Titre : Stator harmonic currents in VSI-fed synchronous motors with multiple three-phase armature windings Type de document : texte imprimé Auteurs : Tessarolo, A., Auteur ; Bassi, C., Auteur Année de publication : 2011 Article en page(s) : pp 974 - 982 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : PWM invertors; asynchronous machines; machine testing; machine windings; synchronous motor drives Résumé : Electric motors equipped with multiple three-phase windings are often used for the advantages they offer in terms of reliability, performance, and inverter power segmentation. When the windings are fed by independent voltage-source inverters (VSIs), circulation harmonic currents can occur in stator phases. If the motor is an induction machine, circulation currents are known to originate form transient imbalances in the applied voltages due to inverter switching. This paper investigates the problem when a synchronous machine is used and shows how additional (and possibly major) sources for circulation currents can arise in this case (even with a round-rotor design) due to the nonsinusoidal air-gap flux distribution. The phenomenon is illustrated for a 45-MW quadruple three-phase synchronous motor supplied by four medium-voltage (MV) multilevel VSIs. Its circulation currents are predicted with two alternative methods, i.e., analytically and from time-stepping finite-element simulation. The results obtained in both ways are shown to well match measurement results collected on the actual motor during full-load system testing. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5593876&sortType%3Das [...] [article] Stator harmonic currents in VSI-fed synchronous motors with multiple three-phase armature windings [texte imprimé] / Tessarolo, A., Auteur ; Bassi, C., Auteur . - 2011 . - pp 974 - 982.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp 974 - 982
Mots-clés : PWM invertors; asynchronous machines; machine testing; machine windings; synchronous motor drives Résumé : Electric motors equipped with multiple three-phase windings are often used for the advantages they offer in terms of reliability, performance, and inverter power segmentation. When the windings are fed by independent voltage-source inverters (VSIs), circulation harmonic currents can occur in stator phases. If the motor is an induction machine, circulation currents are known to originate form transient imbalances in the applied voltages due to inverter switching. This paper investigates the problem when a synchronous machine is used and shows how additional (and possibly major) sources for circulation currents can arise in this case (even with a round-rotor design) due to the nonsinusoidal air-gap flux distribution. The phenomenon is illustrated for a 45-MW quadruple three-phase synchronous motor supplied by four medium-voltage (MV) multilevel VSIs. Its circulation currents are predicted with two alternative methods, i.e., analytically and from time-stepping finite-element simulation. The results obtained in both ways are shown to well match measurement results collected on the actual motor during full-load system testing. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5593876&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 983 - 992
Titre : Design and evaluation of a 42-V automotive alternator with integrated switched-mode rectifier Type de document : texte imprimé Auteurs : Tang, S. C., Auteur ; Otten, D. M., Auteur ; Keim, T. A., Auteur Année de publication : 2011 Article en page(s) : pp. 983 - 992 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Alternators; automotive electronics; machine windings; power electronics; rectifiers; stators Résumé : This paper presents techniques for the design of high-power Lundell alternators with integrated switched-mode rectifiers. A multisection stator winding and interleaved rectifier arrangement is introduced that enables high power levels to be achieved using small semiconductor devices, and which greatly reduces the output filter capacitor requirements. We also demonstrate control methods suited for this interleaved system. In addition to accurate closed-loop output voltage control, we introduce methods to provide (partial) synchronous rectification for reduced loss, and to provide tight load-dump transient control. The proposed technology is validated in the design and experimental evaluation of a 42-V, 3.4-kW alternator with fully integrated power electronics and controls. The prototype alternator achieves approximately a factor of 2.1 increase in power and 1.6 increase in power density as compared to a conventional diode-rectified alternator. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5559389&sortType%3Das [...] [article] Design and evaluation of a 42-V automotive alternator with integrated switched-mode rectifier [texte imprimé] / Tang, S. C., Auteur ; Otten, D. M., Auteur ; Keim, T. A., Auteur . - 2011 . - pp. 983 - 992.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 983 - 992
Mots-clés : Alternators; automotive electronics; machine windings; power electronics; rectifiers; stators Résumé : This paper presents techniques for the design of high-power Lundell alternators with integrated switched-mode rectifiers. A multisection stator winding and interleaved rectifier arrangement is introduced that enables high power levels to be achieved using small semiconductor devices, and which greatly reduces the output filter capacitor requirements. We also demonstrate control methods suited for this interleaved system. In addition to accurate closed-loop output voltage control, we introduce methods to provide (partial) synchronous rectification for reduced loss, and to provide tight load-dump transient control. The proposed technology is validated in the design and experimental evaluation of a 42-V, 3.4-kW alternator with fully integrated power electronics and controls. The prototype alternator achieves approximately a factor of 2.1 increase in power and 1.6 increase in power density as compared to a conventional diode-rectified alternator. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5559389&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 993 - 1000
Titre : Design and experimental verification of hybrid excitation machine with isolated magnetic paths Type de document : texte imprimé Auteurs : Qi Zhang, Auteur ; Huang, Surong, Auteur ; Guodong Xie, Auteur Année de publication : 2011 Article en page(s) : pp. 993 - 1000 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Electric machines; exciters; finite element analysis Résumé : In order to extend the speed-operation range for constant generating voltage or constant motoring power of the electrical machine, a new hybrid excitation machine with isolated magnetic paths (HEIMP) is presented in this paper. Its structure, operation mechanism, and two crucial design points are described in detail. A conceptual prototype machine is designed and manufactured in integration with a rotating-armature ac exciter (brushless). It is then simulated by finite element analysis software and tested in order to verify the efficient field-adjusting characteristics, the high efficiency, and the feasible design technique of the HEIMP machine. It is also shown that the integrated brushless design makes the system more compact and reliable. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5492183&sortType%3Das [...] [article] Design and experimental verification of hybrid excitation machine with isolated magnetic paths [texte imprimé] / Qi Zhang, Auteur ; Huang, Surong, Auteur ; Guodong Xie, Auteur . - 2011 . - pp. 993 - 1000.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 993 - 1000
Mots-clés : Electric machines; exciters; finite element analysis Résumé : In order to extend the speed-operation range for constant generating voltage or constant motoring power of the electrical machine, a new hybrid excitation machine with isolated magnetic paths (HEIMP) is presented in this paper. Its structure, operation mechanism, and two crucial design points are described in detail. A conceptual prototype machine is designed and manufactured in integration with a rotating-armature ac exciter (brushless). It is then simulated by finite element analysis software and tested in order to verify the efficient field-adjusting characteristics, the high efficiency, and the feasible design technique of the HEIMP machine. It is also shown that the integrated brushless design makes the system more compact and reliable. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5492183&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1001 - 1009
Titre : End effects in multiphase fractional slot concentrated-winding surface permanent magnet synchronous machines Type de document : texte imprimé Auteurs : Shah, M. R., Auteur ; EL-Refaie, Ayman M., Auteur Année de publication : 2011 Article en page(s) : pp. 1001 - 1009 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Eddy current losses; machine windings; permanent magnet machines; synchronous machines Résumé : Fractional-slot concentrated windings have been gaining a lot of interest in permanent magnet synchronous machines. This is due to the advantages they provide, including shorter nonoverlapping end turns, higher efficiency, higher power density, higher slot fill factor, lower manufacturing cost, better flux-weakening capability resulting in wider constant power versus speed range, and fault tolerance. This paper investigates the end effects in this type of machines. The study focuses on eddy-current losses in the frame, end shields, and clamping rings (magnetic/nonmagnetic). Desirable slot/pole combinations for different number of phases are investigated including both the single- and the double-layer windings. Suggestions for clearances between end windings and the support structure are given. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5555958&sortType%3Das [...] [article] End effects in multiphase fractional slot concentrated-winding surface permanent magnet synchronous machines [texte imprimé] / Shah, M. R., Auteur ; EL-Refaie, Ayman M., Auteur . - 2011 . - pp. 1001 - 1009.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1001 - 1009
Mots-clés : Eddy current losses; machine windings; permanent magnet machines; synchronous machines Résumé : Fractional-slot concentrated windings have been gaining a lot of interest in permanent magnet synchronous machines. This is due to the advantages they provide, including shorter nonoverlapping end turns, higher efficiency, higher power density, higher slot fill factor, lower manufacturing cost, better flux-weakening capability resulting in wider constant power versus speed range, and fault tolerance. This paper investigates the end effects in this type of machines. The study focuses on eddy-current losses in the frame, end shields, and clamping rings (magnetic/nonmagnetic). Desirable slot/pole combinations for different number of phases are investigated including both the single- and the double-layer windings. Suggestions for clearances between end windings and the support structure are given. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5555958&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1010 - 1020
Titre : Effect of the variation of the rotor impedance with slip on the performance of single-phase excited three-phase induction motors Type de document : texte imprimé Auteurs : Abu-Elhaija, W. S., Auteur ; Muetze, A., Auteur Année de publication : 2011 Article en page(s) : pp. 1010 - 1020 Note générale : energyc onversion Langues : Anglais (eng) Mots-clés : Capacitor motors; electric impedance; induction motors; machine theory; rotors Résumé : Certain conditions can require a three-phase induction motor to be operated on a single-phase supply. The proper sizing of the required auxiliary capacitor to meet certain criteria has been discussed, both for constant and for electronics-based variable capacitors. Generally, constant motor parameters are assumed. However, as of a certain motor size, and hence, slot depth, the rotor impedance varies with slip because of skin effect. In this paper, we discuss the influence of this phenomenon on the motor performance, focusing on the peculiarities of single-phase operation. The analysis not only includes Y- and Δ-connected motors but also a third type of connection that we refer to as “Y-segregated leg-connection” and that has not yet found much attention. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5444910&sortType%3Das [...] [article] Effect of the variation of the rotor impedance with slip on the performance of single-phase excited three-phase induction motors [texte imprimé] / Abu-Elhaija, W. S., Auteur ; Muetze, A., Auteur . - 2011 . - pp. 1010 - 1020.
energyc onversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1010 - 1020
Mots-clés : Capacitor motors; electric impedance; induction motors; machine theory; rotors Résumé : Certain conditions can require a three-phase induction motor to be operated on a single-phase supply. The proper sizing of the required auxiliary capacitor to meet certain criteria has been discussed, both for constant and for electronics-based variable capacitors. Generally, constant motor parameters are assumed. However, as of a certain motor size, and hence, slot depth, the rotor impedance varies with slip because of skin effect. In this paper, we discuss the influence of this phenomenon on the motor performance, focusing on the peculiarities of single-phase operation. The analysis not only includes Y- and Δ-connected motors but also a third type of connection that we refer to as “Y-segregated leg-connection” and that has not yet found much attention. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5444910&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1021 - 1027
Titre : Micro-T circuit model for the analysis of cylindrical induction heating systems Type de document : texte imprimé Auteurs : Qaseer, L. J. B., Auteur Année de publication : 2011 Article en page(s) : pp. 1021 - 1027 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Electromagnetic induction; equivalent circuits; induction heating; iterative methods Résumé : A method is given for obtaining a phase terminal equivalent circuit, which is useful for the analysis of cylindrical induction heating systems for electric energy conversion into heat. The excitation is circumferential and can be realized as either a three-phase system or a single-phase system. The iterative form of the solution allows for solid and hollow charges. First, a general form of the field solution is obtained using transfer matrices. A variable transformation is then made, which makes it possible to derive an equivalent circuit for each annular region in the system. By joining the equivalent circuits in cascade, an equivalent circuit for the complete system is obtained. The voltages and currents in the equivalent circuit relate directly to the field quantities within the actual system. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5555959&sortType%3Das [...] [article] Micro-T circuit model for the analysis of cylindrical induction heating systems [texte imprimé] / Qaseer, L. J. B., Auteur . - 2011 . - pp. 1021 - 1027.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1021 - 1027
Mots-clés : Electromagnetic induction; equivalent circuits; induction heating; iterative methods Résumé : A method is given for obtaining a phase terminal equivalent circuit, which is useful for the analysis of cylindrical induction heating systems for electric energy conversion into heat. The excitation is circumferential and can be realized as either a three-phase system or a single-phase system. The iterative form of the solution allows for solid and hollow charges. First, a general form of the field solution is obtained using transfer matrices. A variable transformation is then made, which makes it possible to derive an equivalent circuit for each annular region in the system. By joining the equivalent circuits in cascade, an equivalent circuit for the complete system is obtained. The voltages and currents in the equivalent circuit relate directly to the field quantities within the actual system. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5555959&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1028 - 1039
Titre : Direct active and reactive power regulation of DFIG using sliding-mode control approach Type de document : texte imprimé Auteurs : Jiabing Hu, Auteur ; Heng Nian, Auteur ; Hu, Bin, Auteur Année de publication : 2011 Article en page(s) : pp. 1028 - 1039 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Asynchronous generators; nonlinear control systems; power convertors; power grids; power harmonic filters; power system interconnection; reactive power control; rotors; table lookup; variable structure systems; wind turbines Résumé : This paper presents a new direct active and reactive power control (DPC) of grid-connected doubly fed induction generator (DFIG)-based wind turbine systems. The proposed DPC strategy employs a nonlinear sliding-mode control scheme to directly calculate the required rotor control voltage so as to eliminate the instantaneous errors of active and reactive powers without involving any synchronous coordinate transformations. Thus, no extra current control loops are required, thereby simplifying the system design and enhancing the transient performance. Constant converter switching frequency is achieved by using space vector modulation, which eases the designs of the power converter and the ac harmonic filter. Simulation results on a 2-MW grid-connected DFIG system are provided and compared with those of classic voltage-oriented vector control (VC) and conventional lookup table (LUT) DPC. The proposed DPC provides enhanced transient performance similar to the LUT DPC and keeps the steady-state harmonic spectra at the same level as the VC strategy. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5484443&sortType%3Das [...] [article] Direct active and reactive power regulation of DFIG using sliding-mode control approach [texte imprimé] / Jiabing Hu, Auteur ; Heng Nian, Auteur ; Hu, Bin, Auteur . - 2011 . - pp. 1028 - 1039.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1028 - 1039
Mots-clés : Asynchronous generators; nonlinear control systems; power convertors; power grids; power harmonic filters; power system interconnection; reactive power control; rotors; table lookup; variable structure systems; wind turbines Résumé : This paper presents a new direct active and reactive power control (DPC) of grid-connected doubly fed induction generator (DFIG)-based wind turbine systems. The proposed DPC strategy employs a nonlinear sliding-mode control scheme to directly calculate the required rotor control voltage so as to eliminate the instantaneous errors of active and reactive powers without involving any synchronous coordinate transformations. Thus, no extra current control loops are required, thereby simplifying the system design and enhancing the transient performance. Constant converter switching frequency is achieved by using space vector modulation, which eases the designs of the power converter and the ac harmonic filter. Simulation results on a 2-MW grid-connected DFIG system are provided and compared with those of classic voltage-oriented vector control (VC) and conventional lookup table (LUT) DPC. The proposed DPC provides enhanced transient performance similar to the LUT DPC and keeps the steady-state harmonic spectra at the same level as the VC strategy. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5484443&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1040 - 1047
Titre : Dynamic modeling of three-phase asymmetric power transformers with magnetic hysteresis : no-load and inrush conditions Type de document : texte imprimé Auteurs : Moses, P. S., Auteur ; Masoum, M. A. S., Auteur ; Toliyat, H. A., Auteur Année de publication : 2011 Article en page(s) : pp. 1040 - 1047 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Ferroresonance; magnetic circuits; magnetic hysteresis; nonlinear functions; power transformers; time-domain analysis Résumé : A new dynamic model of a three-phase three-leg transformer for steady-state and transient operating conditions is proposed in this paper. With very few exceptions, the existing models oversimplify the magnetic interactions in multileg core topologies and employ single-value nonlinear functions for modeling core nonlinearities. Unfortunately, this does not provide sufficient accuracy for a wide range of dynamic disturbances such as dc bias, ferroresonance, and inrush. For this purpose, a new time-domain model based on magnetic-circuit theory is developed to include dynamic-hysteresis behavior (major and minor loops) in asymmetric three-leg core topologies. Furthermore, a new analysis is performed to study the impacts of hysteresis on no-load and transient inrush current behavior in three-phase transformers. Simulation results have been successfully compared with measurements to verify the accuracy of the proposed model. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5575408&sortType%3Das [...] [article] Dynamic modeling of three-phase asymmetric power transformers with magnetic hysteresis : no-load and inrush conditions [texte imprimé] / Moses, P. S., Auteur ; Masoum, M. A. S., Auteur ; Toliyat, H. A., Auteur . - 2011 . - pp. 1040 - 1047.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1040 - 1047
Mots-clés : Ferroresonance; magnetic circuits; magnetic hysteresis; nonlinear functions; power transformers; time-domain analysis Résumé : A new dynamic model of a three-phase three-leg transformer for steady-state and transient operating conditions is proposed in this paper. With very few exceptions, the existing models oversimplify the magnetic interactions in multileg core topologies and employ single-value nonlinear functions for modeling core nonlinearities. Unfortunately, this does not provide sufficient accuracy for a wide range of dynamic disturbances such as dc bias, ferroresonance, and inrush. For this purpose, a new time-domain model based on magnetic-circuit theory is developed to include dynamic-hysteresis behavior (major and minor loops) in asymmetric three-leg core topologies. Furthermore, a new analysis is performed to study the impacts of hysteresis on no-load and transient inrush current behavior in three-phase transformers. Simulation results have been successfully compared with measurements to verify the accuracy of the proposed model. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5575408&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1048 - 1056
Titre : Voltage-sag tolerance of DFIG wind turbine with a series grid side passive-impedance network Type de document : texte imprimé Auteurs : Xiangwu Yan, Auteur ; Venkataramanan, G., Auteur ; Flannery, P. S., Auteur Année de publication : 2011 Article en page(s) : pp. 1048 - 1056 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Asynchronous generators; power supply quality; wind turbines Résumé : Due to the increase of the number of wind turbines connected directly to the electric utility grid, new regulator codes have been issued that require low-voltage ride-through capability for wind turbines so that they can remain online and support the electric grid during voltage sags. Conventional ride-through techniques for the doubly fed induction generator (DFIG) architecture result in compromised control of the turbine shaft and grid current during fault events. In this paper, a series passive-impedance network at the stator side of a DFIG wind turbine is presented. It is easy to control, capable of off-line operation for high efficiency, and low cost for manufacturing and maintenance. The balanced and unbalanced fault responses of a DFIG wind turbine with a series grid side passive-impedance network are examined using computer simulations and hardware experiments. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5546936&sortType%3Das [...] [article] Voltage-sag tolerance of DFIG wind turbine with a series grid side passive-impedance network [texte imprimé] / Xiangwu Yan, Auteur ; Venkataramanan, G., Auteur ; Flannery, P. S., Auteur . - 2011 . - pp. 1048 - 1056.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1048 - 1056
Mots-clés : Asynchronous generators; power supply quality; wind turbines Résumé : Due to the increase of the number of wind turbines connected directly to the electric utility grid, new regulator codes have been issued that require low-voltage ride-through capability for wind turbines so that they can remain online and support the electric grid during voltage sags. Conventional ride-through techniques for the doubly fed induction generator (DFIG) architecture result in compromised control of the turbine shaft and grid current during fault events. In this paper, a series passive-impedance network at the stator side of a DFIG wind turbine is presented. It is easy to control, capable of off-line operation for high efficiency, and low cost for manufacturing and maintenance. The balanced and unbalanced fault responses of a DFIG wind turbine with a series grid side passive-impedance network are examined using computer simulations and hardware experiments. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5546936&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1057 - 1062
Titre : Performance prediction of single-sided induction heating system Type de document : texte imprimé Auteurs : Alwash, J. H. H., Auteur ; Sultan, S. K., Auteur Année de publication : 2011 Article en page(s) : pp. 1057 - 1062 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Coils; induction heating; multilayers Résumé : Surface induction heating is nowadays widely used with coil arrangement varied according to the work piece topology. For a flat work piece arrangement, the coil may be of the single-conductor type or single-coil type, and finally, it may be of multicoil type. It is thought that the development of a generalized approach to analyze all three possible excitation systems mentioned earlier is an important task. In this paper, a generalized approach using a multilayer electromagnetic model is presented to analyze all three possible excitation arrangements. The theoretical results are compared with the experimental findings and with theoretical results obtained using other approaches. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5623333&sortType%3Das [...] [article] Performance prediction of single-sided induction heating system [texte imprimé] / Alwash, J. H. H., Auteur ; Sultan, S. K., Auteur . - 2011 . - pp. 1057 - 1062.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1057 - 1062
Mots-clés : Coils; induction heating; multilayers Résumé : Surface induction heating is nowadays widely used with coil arrangement varied according to the work piece topology. For a flat work piece arrangement, the coil may be of the single-conductor type or single-coil type, and finally, it may be of multicoil type. It is thought that the development of a generalized approach to analyze all three possible excitation systems mentioned earlier is an important task. In this paper, a generalized approach using a multilayer electromagnetic model is presented to analyze all three possible excitation arrangements. The theoretical results are compared with the experimental findings and with theoretical results obtained using other approaches. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5623333&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1063 - 1070
Titre : Controller design for a large-scale ultrasupercritical once-through boiler power plant Type de document : texte imprimé Auteurs : K. Y. Lee, Auteur ; Van Sickel, J.H., Auteur ; Hoffman, J. A., Auteur Année de publication : 2011 Article en page(s) : pp. 1063 - 1070 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Boilers; neural nets; power system control; power system simulation; three-term control Résumé : A large-scale once-through-type ultrasupercritical boiler power plant is investigated for the development of an analyzable model for use in developing an intelligent control system. Using data from the power plant, a model is realized using dynamically recurrent neural networks (NN). This requires the partitioning of multiple subsystems, which are each represented by an individual NN that when combined form the whole plant model. Modified predictive optimal control was used to drive the plant to desired states; however, due to the computational intensity of this approach, it could not be executed quickly enough to satisfy project requirements. As an alternative, a reference governor was implemented along with a PID feedback control system that utilizes intelligent gain tuning, which, while more complicated, satisfied the computational speed required for the controller to be realized. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5594627&sortType%3Das [...] [article] Controller design for a large-scale ultrasupercritical once-through boiler power plant [texte imprimé] / K. Y. Lee, Auteur ; Van Sickel, J.H., Auteur ; Hoffman, J. A., Auteur . - 2011 . - pp. 1063 - 1070.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1063 - 1070
Mots-clés : Boilers; neural nets; power system control; power system simulation; three-term control Résumé : A large-scale once-through-type ultrasupercritical boiler power plant is investigated for the development of an analyzable model for use in developing an intelligent control system. Using data from the power plant, a model is realized using dynamically recurrent neural networks (NN). This requires the partitioning of multiple subsystems, which are each represented by an individual NN that when combined form the whole plant model. Modified predictive optimal control was used to drive the plant to desired states; however, due to the computational intensity of this approach, it could not be executed quickly enough to satisfy project requirements. As an alternative, a reference governor was implemented along with a PID feedback control system that utilizes intelligent gain tuning, which, while more complicated, satisfied the computational speed required for the controller to be realized. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5594627&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1071 - 1080
Titre : Deterministic and stochastic study of wind farm harmonic currents Type de document : texte imprimé Auteurs : Sainz, L., Auteur ; Mesas, J. J., Auteur ; Teodorescu, R., Auteur Année de publication : 2011 Article en page(s) : pp. 1071 - 1080 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Power supply quality; power system harmonics; power system measurement; stochastic processes; wind power plants Résumé : Wind farm harmonic emissions are a well-known power quality problem, but little data based on actual wind farm measurements are available in literature. In this paper, harmonic emissions of an 18 MW wind farm are investigated using extensive measurements, and the deterministic and stochastic characterization of wind farm harmonic currents is analyzed. Specific issues addressed in the paper include the harmonic variation with the wind farm operating point and the random characteristics of their magnitude and phase angle. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5477160&sortType%3Das [...] [article] Deterministic and stochastic study of wind farm harmonic currents [texte imprimé] / Sainz, L., Auteur ; Mesas, J. J., Auteur ; Teodorescu, R., Auteur . - 2011 . - pp. 1071 - 1080.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1071 - 1080
Mots-clés : Power supply quality; power system harmonics; power system measurement; stochastic processes; wind power plants Résumé : Wind farm harmonic emissions are a well-known power quality problem, but little data based on actual wind farm measurements are available in literature. In this paper, harmonic emissions of an 18 MW wind farm are investigated using extensive measurements, and the deterministic and stochastic characterization of wind farm harmonic currents is analyzed. Specific issues addressed in the paper include the harmonic variation with the wind farm operating point and the random characteristics of their magnitude and phase angle. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5477160&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1081 - 1091
Titre : Analytical study of grid-fault response of wind turbine doubly fed induction generator Type de document : texte imprimé Auteurs : Pannell, G., Auteur ; Atkinson, D. J., Auteur ; Zahawi, B., Auteur Année de publication : 2011 Article en page(s) : pp. 1081 - 1091 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Asynchronous generators; rotors; stators; wind turbines Résumé : Grid-connected wind turbine doubly fed induction generators (DFIGs) are sensitive to dips in supply voltage, so-called “grid faults”. Fault ride through systems must be designed to manage the large and potentially dangerous fault currents in both stator and rotor circuits. However, DFIG fault response has been only partially or summarily treated in contemporary literature. This paper presents a detailed analytical analysis of wind turbine DFIG grid-fault response. The physical behavior of the machine is presented through a description of the flux-linkage response and later developed with analytical solutions of the generalized DFIG machine equations operating under fault conditions showing that the frequencies of the decay components of current deviate from pure dc and rotor speed due to magnetic drag effects. The analysis is experimentally verified and evaluated using a 7.5-kW test facility. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5623338&sortType%3Das [...] [article] Analytical study of grid-fault response of wind turbine doubly fed induction generator [texte imprimé] / Pannell, G., Auteur ; Atkinson, D. J., Auteur ; Zahawi, B., Auteur . - 2011 . - pp. 1081 - 1091.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1081 - 1091
Mots-clés : Asynchronous generators; rotors; stators; wind turbines Résumé : Grid-connected wind turbine doubly fed induction generators (DFIGs) are sensitive to dips in supply voltage, so-called “grid faults”. Fault ride through systems must be designed to manage the large and potentially dangerous fault currents in both stator and rotor circuits. However, DFIG fault response has been only partially or summarily treated in contemporary literature. This paper presents a detailed analytical analysis of wind turbine DFIG grid-fault response. The physical behavior of the machine is presented through a description of the flux-linkage response and later developed with analytical solutions of the generalized DFIG machine equations operating under fault conditions showing that the frequencies of the decay components of current deviate from pure dc and rotor speed due to magnetic drag effects. The analysis is experimentally verified and evaluated using a 7.5-kW test facility. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5623338&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1092 - 1101
Titre : Integrating fuel cell/electrolyzer/ultracapacitor system into a stand-alone microhydro plant Type de document : texte imprimé Auteurs : Gyawali, N., Auteur ; Ohsawa, Y., Auteur Année de publication : 2011 Article en page(s) : pp. 1092 - 1101 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Fuel cells; hydroelectric power stations; supercapacitors Résumé : This paper explores the control and operational aspects of introducing fuel cell/electrolyzer/ultracapacitor (FC/ELZ/UC) unit into a microhydro power system, replacing the conventional electronic load controller/dump-load unit. FC/ELZ is expected to provide long-term energy balance by utilizing the hydrogen technology, whereas the UC is employed as buffer storage for the transient compensation. System configuration is proposed, control scheme is designed, and the detailed dynamic modeling is developed for each component of the system. Expected behaviors during the sudden load change and hydro input variation are observed by mathematical simulation. Finally, the results of the analysis are summarized with their applicability to real system and the limitation/further scope are indicated. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5580065&sortType%3Das [...] [article] Integrating fuel cell/electrolyzer/ultracapacitor system into a stand-alone microhydro plant [texte imprimé] / Gyawali, N., Auteur ; Ohsawa, Y., Auteur . - 2011 . - pp. 1092 - 1101.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1092 - 1101
Mots-clés : Fuel cells; hydroelectric power stations; supercapacitors Résumé : This paper explores the control and operational aspects of introducing fuel cell/electrolyzer/ultracapacitor (FC/ELZ/UC) unit into a microhydro power system, replacing the conventional electronic load controller/dump-load unit. FC/ELZ is expected to provide long-term energy balance by utilizing the hydrogen technology, whereas the UC is employed as buffer storage for the transient compensation. System configuration is proposed, control scheme is designed, and the detailed dynamic modeling is developed for each component of the system. Expected behaviors during the sudden load change and hydro input variation are observed by mathematical simulation. Finally, the results of the analysis are summarized with their applicability to real system and the limitation/further scope are indicated. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5580065&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1102 - 1111
Titre : Coordinated power quality improvement in multiunit diesel power plants Type de document : texte imprimé Auteurs : Platero, C. A., Auteur ; Blàzquez, F., Auteur ; Frias, P., Auteur Année de publication : 2011 Article en page(s) : pp. 1102 - 1111 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Compensation; diesel engines; diesel-electric power stations; power grids; power supply quality; power system interconnection; synchronisation; torque control Résumé : Power quality is a main concern in power systems with generators driven by internal combustion engines, especially by low- and medium-speed diesel engines. The torque in internal combustion engines, which is the superposition of the torques from each cylinder, has periodic oscillations. These torque oscillations, once the generator is connected to the grid, result in power fluctuations and voltage flicker problems, which clearly reduce power quality. This paper presents a new control strategy to improve power quality in multiunit diesel power plants, based on the compensation of the electrical fluctuations between individual generators. This compensation is performed by properly controlling the mechanical rotor phase angle between the different generators during the synchronization process. The proposed control strategy is verified using a case study. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5546931&sortType%3Das [...] [article] Coordinated power quality improvement in multiunit diesel power plants [texte imprimé] / Platero, C. A., Auteur ; Blàzquez, F., Auteur ; Frias, P., Auteur . - 2011 . - pp. 1102 - 1111.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1102 - 1111
Mots-clés : Compensation; diesel engines; diesel-electric power stations; power grids; power supply quality; power system interconnection; synchronisation; torque control Résumé : Power quality is a main concern in power systems with generators driven by internal combustion engines, especially by low- and medium-speed diesel engines. The torque in internal combustion engines, which is the superposition of the torques from each cylinder, has periodic oscillations. These torque oscillations, once the generator is connected to the grid, result in power fluctuations and voltage flicker problems, which clearly reduce power quality. This paper presents a new control strategy to improve power quality in multiunit diesel power plants, based on the compensation of the electrical fluctuations between individual generators. This compensation is performed by properly controlling the mechanical rotor phase angle between the different generators during the synchronization process. The proposed control strategy is verified using a case study. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5546931&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1112 - 1122
Titre : Short-horizon prediction of wind power : a data-driven approach Type de document : texte imprimé Auteurs : Kusiak, A., Auteur ; Zijun Zhang, Auteur Année de publication : 2011 Article en page(s) : pp. 1112 - 1122 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Data mining; neural nets; power engineering computing; prediction theory; statistical analysis; wind power plants Résumé : This paper discusses short-horizon prediction of wind speed and power using wind turbine data collected at 10 s intervals. A time-series model approach to examine wind behavior is studied. Both exponential smoothing and data-driven models are developed for wind prediction. Power prediction models are established, which are based on the most effective wind prediction model. Comparative analysis of the power predicting models is discussed. Computational results demonstrate performance advantages provided by the data-driven approach. All computations reported in the paper are based on the data collected at a large wind farm. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5451084&sortType%3Das [...] [article] Short-horizon prediction of wind power : a data-driven approach [texte imprimé] / Kusiak, A., Auteur ; Zijun Zhang, Auteur . - 2011 . - pp. 1112 - 1122.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1112 - 1122
Mots-clés : Data mining; neural nets; power engineering computing; prediction theory; statistical analysis; wind power plants Résumé : This paper discusses short-horizon prediction of wind speed and power using wind turbine data collected at 10 s intervals. A time-series model approach to examine wind behavior is studied. Both exponential smoothing and data-driven models are developed for wind prediction. Power prediction models are established, which are based on the most effective wind prediction model. Comparative analysis of the power predicting models is discussed. Computational results demonstrate performance advantages provided by the data-driven approach. All computations reported in the paper are based on the data collected at a large wind farm. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5451084&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1123 - 1132
Titre : T-S fuzzy maximum power point tracking control of solar power generation systems Type de document : texte imprimé Auteurs : Chian-Song Chiu, Auteur Année de publication : 2011 Article en page(s) : pp. 1123 - 1132 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Fuzzy control; maximum power point trackers; power generation control; solar power stations Résumé : This paper presents maximum power point tracking (MPPT) control for stand-alone solar power generation systems via the Takagi-Sugeno (T-S) fuzzy-model-based approach. In detail, we consider a dc/dc buck converter to regulate the output power of the photovoltaic panel array. First, the system is represented by the T-S fuzzy model. Next, in order to reduce the number of measured signals, a T-S fuzzy observer is developed for state feedback. Then, a fuzzy direct MPPT controller is proposed to achieve asymptotic MPPT control, in which the observer and controller gains are obtained by separately solving two sets of linear matrix inequalities. Different from the traditional MPPT approaches, the proposed T-S fuzzy controller directly drives the system to the maximum power point without searching the maximum power point and measuring insolation. Furthermore, when considering disturbance and uncertainty, robust MPPT is guaranteed by advanced gain design. Therefore, the proposed method provides an easier implementation form under strict stability analysis. Finally, the control performance is shown from the numerical simulation and experimental results. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5437312&sortType%3Das [...] [article] T-S fuzzy maximum power point tracking control of solar power generation systems [texte imprimé] / Chian-Song Chiu, Auteur . - 2011 . - pp. 1123 - 1132.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1123 - 1132
Mots-clés : Fuzzy control; maximum power point trackers; power generation control; solar power stations Résumé : This paper presents maximum power point tracking (MPPT) control for stand-alone solar power generation systems via the Takagi-Sugeno (T-S) fuzzy-model-based approach. In detail, we consider a dc/dc buck converter to regulate the output power of the photovoltaic panel array. First, the system is represented by the T-S fuzzy model. Next, in order to reduce the number of measured signals, a T-S fuzzy observer is developed for state feedback. Then, a fuzzy direct MPPT controller is proposed to achieve asymptotic MPPT control, in which the observer and controller gains are obtained by separately solving two sets of linear matrix inequalities. Different from the traditional MPPT approaches, the proposed T-S fuzzy controller directly drives the system to the maximum power point without searching the maximum power point and measuring insolation. Furthermore, when considering disturbance and uncertainty, robust MPPT is guaranteed by advanced gain design. Therefore, the proposed method provides an easier implementation form under strict stability analysis. Finally, the control performance is shown from the numerical simulation and experimental results. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5437312&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1133 - 1141
Titre : Modeling discharge behavior of multicell battery Type de document : texte imprimé Auteurs : Jiucai Zhang, Auteur ; Song Ci, Auteur ; Sharif, H., Auteur Année de publication : 2011 Article en page(s) : pp. 1133 - 1141 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Battery management systems; cells (electric); discharges (electric) Résumé : Multicell battery has been widely used in various electrical and electronics devices. To achieve the optimal multicell battery design, accurately modeling battery discharge behavior of multicell battery is crucial. However, modeling discharge behavior of multicell battery is very challenging due to the nonlinear battery effects, nonuniform cell quality, and various cell connections. In this paper, we develop a circuit-based multicell battery model to accurately model the multicell battery discharge behavior in terms of available capacity, output voltage, and internal resistance with consideration of nonlinear battery effect and nonuniform cell quality. It also characterizes the cell discharge current distribution of cell strings in parallel connection. The proposed multicell battery model has been validated by extensive simulation and experimental results under various load conditions. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5484504&sortType%3Das [...] [article] Modeling discharge behavior of multicell battery [texte imprimé] / Jiucai Zhang, Auteur ; Song Ci, Auteur ; Sharif, H., Auteur . - 2011 . - pp. 1133 - 1141.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1133 - 1141
Mots-clés : Battery management systems; cells (electric); discharges (electric) Résumé : Multicell battery has been widely used in various electrical and electronics devices. To achieve the optimal multicell battery design, accurately modeling battery discharge behavior of multicell battery is crucial. However, modeling discharge behavior of multicell battery is very challenging due to the nonlinear battery effects, nonuniform cell quality, and various cell connections. In this paper, we develop a circuit-based multicell battery model to accurately model the multicell battery discharge behavior in terms of available capacity, output voltage, and internal resistance with consideration of nonlinear battery effect and nonuniform cell quality. It also characterizes the cell discharge current distribution of cell strings in parallel connection. The proposed multicell battery model has been validated by extensive simulation and experimental results under various load conditions. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5484504&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1142 - 1151
Titre : Optimal control of variable speed wind turbines in islanded mode of operation Type de document : texte imprimé Auteurs : Kanellos, F. D., Auteur ; Hatziargyriou, N. D., Auteur Année de publication : 2011 Article en page(s) : pp. 1142 - 1151 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Angular velocity control; asynchronous generators; distributed power generation; electricity supply industry deregulation; optimal control; power generation control; wind turbines Résumé : Nowadays, technology evolution and deregulation of the electric utility industry enable distributed generation (DG) to play an increasing role in satisfying locally the power demand. In this paper, an optimal control method for variable speed wind turbines (VSWTs) in islanded mode of operation is presented. Aim of this control system is to minimize the necessary control action in order to track the active power demand. Consequently, reduced mechanical stresses and equipment damages are achieved, while system stable operation and reliability are ensured. The proposed control scheme can be applied to any type of pitch controlled VSWT. For evaluation purposes, it is applied to a VSWT equipped with a doubly fed induction generator. Finally, simulation results are presented and general conclusions are drawn. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5477161&sortType%3Das [...] [article] Optimal control of variable speed wind turbines in islanded mode of operation [texte imprimé] / Kanellos, F. D., Auteur ; Hatziargyriou, N. D., Auteur . - 2011 . - pp. 1142 - 1151.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1142 - 1151
Mots-clés : Angular velocity control; asynchronous generators; distributed power generation; electricity supply industry deregulation; optimal control; power generation control; wind turbines Résumé : Nowadays, technology evolution and deregulation of the electric utility industry enable distributed generation (DG) to play an increasing role in satisfying locally the power demand. In this paper, an optimal control method for variable speed wind turbines (VSWTs) in islanded mode of operation is presented. Aim of this control system is to minimize the necessary control action in order to track the active power demand. Consequently, reduced mechanical stresses and equipment damages are achieved, while system stable operation and reliability are ensured. The proposed control scheme can be applied to any type of pitch controlled VSWT. For evaluation purposes, it is applied to a VSWT equipped with a doubly fed induction generator. Finally, simulation results are presented and general conclusions are drawn. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5477161&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1152 - 1161
Titre : New constant electrical power soft-stalling control for small-scale VAWTs Type de document : texte imprimé Auteurs : Ahmed, Ashraf, Auteur ; Ran, L., Auteur ; Bumby, J. R., Auteur Année de publication : 2011 Article en page(s) : pp. 1152 - 1161 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Adaptive control; electric current control; feedback; nonlinear control systems; permanent magnet generators; position control; power control; synchronous generators; wind turbines Résumé : This paper presents a constant power soft-stall control scheme for a vertical-axis wind turbine (VAWT) fitted with a permanent magnet generator. Small-scale VAWTs are attractive due to their ability to capture wind from different directions without using yaw; this simplifies the design and gives the turbine tolerance to turbulence in urban areas. One difficulty with VAWTs is to prevent overspeeding and component overloading at excessive wind velocities. This paper suggests that necessary control can be achieved by controlling the electric power in order to operate the turbine in the stall region. This control strategy attenuates the stress in the system, while smoothing the power generated. It is shown that the controller can stabilize the nonlinear system using an adaptive current feedback loop. The controller does not need wind velocity or turbine speed, but is based on the current and voltage measured on the dc side of the rectifier connected to the permanent magnet synchronous generator. Maximum power point tracking (MPPT) control is provided in normal operation. Simulation and experimental results are presented. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5444990&sortType%3Das [...] [article] New constant electrical power soft-stalling control for small-scale VAWTs [texte imprimé] / Ahmed, Ashraf, Auteur ; Ran, L., Auteur ; Bumby, J. R., Auteur . - 2011 . - pp. 1152 - 1161.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1152 - 1161
Mots-clés : Adaptive control; electric current control; feedback; nonlinear control systems; permanent magnet generators; position control; power control; synchronous generators; wind turbines Résumé : This paper presents a constant power soft-stall control scheme for a vertical-axis wind turbine (VAWT) fitted with a permanent magnet generator. Small-scale VAWTs are attractive due to their ability to capture wind from different directions without using yaw; this simplifies the design and gives the turbine tolerance to turbulence in urban areas. One difficulty with VAWTs is to prevent overspeeding and component overloading at excessive wind velocities. This paper suggests that necessary control can be achieved by controlling the electric power in order to operate the turbine in the stall region. This control strategy attenuates the stress in the system, while smoothing the power generated. It is shown that the controller can stabilize the nonlinear system using an adaptive current feedback loop. The controller does not need wind velocity or turbine speed, but is based on the current and voltage measured on the dc side of the rectifier connected to the permanent magnet synchronous generator. Maximum power point tracking (MPPT) control is provided in normal operation. Simulation and experimental results are presented. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5444990&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1162 - 1170
Titre : Machines and drives comparison for low-power renewable energy and oscillating applications Type de document : texte imprimé Auteurs : Brekken, T. K. A., Auteur ; Hapke, H. M., Auteur ; Stillinger, C., Auteur Année de publication : 2011 Article en page(s) : pp. 1162 - 1170 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Asynchronous machines; brushless machines; reluctance motor drives; renewable energy sources; wave power generation Résumé : The objective of this paper is to analyze, test, and compare machines and drives in oscillating applications. In particular, this paper is focused on low-power wave energy generator applications, such as autonomous weather and monitoring buoys with power requirements in the 100 W and less range. Due to the oscillating motion of waves, the ocean environment can require bidirectional and variable speed operation of the generator. In this research, the efficiency of a set of small brushed dc, induction, brushless dc, and synchronous reluctance drives and machines were compared in constant and oscillating operation. The presented results show that drives and machines used in low-power oscillating applications (e.g., ocean wave energy) should not expect a significant derating with respect to their nameplate rating. In addition, it is shown that the frequency of oscillation (e.g., ocean wave frequency) has little impact on efficiency. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5623334&sortType%3Das [...] [article] Machines and drives comparison for low-power renewable energy and oscillating applications [texte imprimé] / Brekken, T. K. A., Auteur ; Hapke, H. M., Auteur ; Stillinger, C., Auteur . - 2011 . - pp. 1162 - 1170.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1162 - 1170
Mots-clés : Asynchronous machines; brushless machines; reluctance motor drives; renewable energy sources; wave power generation Résumé : The objective of this paper is to analyze, test, and compare machines and drives in oscillating applications. In particular, this paper is focused on low-power wave energy generator applications, such as autonomous weather and monitoring buoys with power requirements in the 100 W and less range. Due to the oscillating motion of waves, the ocean environment can require bidirectional and variable speed operation of the generator. In this research, the efficiency of a set of small brushed dc, induction, brushless dc, and synchronous reluctance drives and machines were compared in constant and oscillating operation. The presented results show that drives and machines used in low-power oscillating applications (e.g., ocean wave energy) should not expect a significant derating with respect to their nameplate rating. In addition, it is shown that the frequency of oscillation (e.g., ocean wave frequency) has little impact on efficiency. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5623334&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1171 - 1178
Titre : Wind farms with HVdc delivery in inertial response and primary frequency control Type de document : texte imprimé Auteurs : Zhixin, Miao, Auteur ; Lingling Fan, Auteur ; Osborn, D., Auteur Année de publication : 2011 Article en page(s) : pp. 1171 - 1178 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : HVDC power convertors; frequency control; wind power plants Résumé : This paper develops a coordination control strategy for wind farms with line commutated converter-based HVdc delivery for participating in inertial response and primary frequency control. The coordination philosophy is to feedback the grid frequency and its derivative and adjust the delivery power of the HVdc link according to the feedback signals. The feedback loop employing the derivative of the grid frequency aims to improve the inertial response while the feedback loop employing the grid frequency deviation introduces a droop at the rectifier control loop. When the grid frequency is too high or too low, active power flow through the HVdc link will be ramped down or up. In turn, the wind generation will increase or decrease the blade angles to reduce or increase the captured wind power through pitch control. A case study demonstrates the effectiveness of the inertial enhancement and frequency droop in HVdc control. Simulation results in transient security assessment tool are given. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5545384&sortType%3Das [...] [article] Wind farms with HVdc delivery in inertial response and primary frequency control [texte imprimé] / Zhixin, Miao, Auteur ; Lingling Fan, Auteur ; Osborn, D., Auteur . - 2011 . - pp. 1171 - 1178.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1171 - 1178
Mots-clés : HVDC power convertors; frequency control; wind power plants Résumé : This paper develops a coordination control strategy for wind farms with line commutated converter-based HVdc delivery for participating in inertial response and primary frequency control. The coordination philosophy is to feedback the grid frequency and its derivative and adjust the delivery power of the HVdc link according to the feedback signals. The feedback loop employing the derivative of the grid frequency aims to improve the inertial response while the feedback loop employing the grid frequency deviation introduces a droop at the rectifier control loop. When the grid frequency is too high or too low, active power flow through the HVdc link will be ramped down or up. In turn, the wind generation will increase or decrease the blade angles to reduce or increase the captured wind power through pitch control. A case study demonstrates the effectiveness of the inertial enhancement and frequency droop in HVdc control. Simulation results in transient security assessment tool are given. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5545384&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1179 - 1186
Titre : On permeance modeling of large hydrogenerators with application to voltage harmonics prediction Type de document : texte imprimé Auteurs : Ranlöf, M., Auteur ; Perers, R., Auteur ; Lundin, U., Auteur Année de publication : 2011 Article en page(s) : pp. 1179 - 1186 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Harmonics; hydroelectric generators; losses Résumé : In this paper, a permeance model that can be employed to estimate the no-load damper current loss and voltage waveform harmonics in large hydrogenerators is presented. The importance of modeling the damper magnetomotive force and inductances correctly is emphasized, and detailed descriptions are presented. The computed harmonics are compared with values obtained from time-stepped finite-element calculations and measured data. The results are in good agreement. The influence of pole-to-pole damper bar connections, and of the number of damper bars on the voltage waveform, is explained. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5445012&sortType%3Das [...] [article] On permeance modeling of large hydrogenerators with application to voltage harmonics prediction [texte imprimé] / Ranlöf, M., Auteur ; Perers, R., Auteur ; Lundin, U., Auteur . - 2011 . - pp. 1179 - 1186.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1179 - 1186
Mots-clés : Harmonics; hydroelectric generators; losses Résumé : In this paper, a permeance model that can be employed to estimate the no-load damper current loss and voltage waveform harmonics in large hydrogenerators is presented. The importance of modeling the damper magnetomotive force and inductances correctly is emphasized, and detailed descriptions are presented. The computed harmonics are compared with values obtained from time-stepped finite-element calculations and measured data. The results are in good agreement. The influence of pole-to-pole damper bar connections, and of the number of damper bars on the voltage waveform, is explained. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5445012&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1187 - 1194
Titre : Fuzzy fault diagnosis and accommodation system for hybrid fuel-cell/gas-turbine power plant Type de document : texte imprimé Auteurs : Yang Wenli, Auteur ; K. Y. Lee, Auteur ; Junker, S.T., Auteur Année de publication : 2011 Article en page(s) : pp. 1187 - 1194 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Fault diagnosis; fuel cell power plants;fuzzy control; fuzzy logic; gas turbine power stations; hybrid power systems; power generation control Résumé : The concept of hybrid fuel-cell power plants has shown its potential for applications and is already under commercialization. In a hybrid fuel-cell and turbine power plant, the control system is an essential component that guarantees reliable and efficient operations. However, due to the limited information possessed by particular local controllers, the plant may become degraded or unstable during system failures. To regulate the power plants under such abnormal situations, a fault diagnosis and accommodation (FDA) system based on fuzzy logic has been developed as an effective complement for the local control scheme. Being a quantitative approach, the fuzzy FDA system can be implemented with considerably lower complexities than an analytical fault regulator. The system structures and design methods are discussed in this paper. Three types of controllers are implemented and investigated. Simulation results are presented to verify the performance of the overall system. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5575407&sortType%3Das [...] [article] Fuzzy fault diagnosis and accommodation system for hybrid fuel-cell/gas-turbine power plant [texte imprimé] / Yang Wenli, Auteur ; K. Y. Lee, Auteur ; Junker, S.T., Auteur . - 2011 . - pp. 1187 - 1194.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1187 - 1194
Mots-clés : Fault diagnosis; fuel cell power plants;fuzzy control; fuzzy logic; gas turbine power stations; hybrid power systems; power generation control Résumé : The concept of hybrid fuel-cell power plants has shown its potential for applications and is already under commercialization. In a hybrid fuel-cell and turbine power plant, the control system is an essential component that guarantees reliable and efficient operations. However, due to the limited information possessed by particular local controllers, the plant may become degraded or unstable during system failures. To regulate the power plants under such abnormal situations, a fault diagnosis and accommodation (FDA) system based on fuzzy logic has been developed as an effective complement for the local control scheme. Being a quantitative approach, the fuzzy FDA system can be implemented with considerably lower complexities than an analytical fault regulator. The system structures and design methods are discussed in this paper. Three types of controllers are implemented and investigated. Simulation results are presented to verify the performance of the overall system. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5575407&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1195 - 1208
Titre : Voltage control and active power management of hybrid fuel-cell/energy-storage power conversion system under unbalanced voltage sag conditions Type de document : texte imprimé Auteurs : Hajizadeh, A., Auteur ; Golkar, M. A., Auteur ; Feliachi, A., Auteur Année de publication : 2011 Article en page(s) : pp. 1195 - 1208 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Distributed power generation; electric current control; energy storage; fuel cell power plants; hybrid power systems; power control; power conversion; power distribution control; power supply quality; supercapacitors; voltage control Résumé : This paper concentrates on the control of hybrid fuel-cell (FC)/energy-storage distributed generation (DG) systems under voltage sag in distribution systems. The proposed control strategy makes hybrid DG system work properly when a voltage disturbance occurs in distribution system, and it stays connected to the main grid. To distribute the power between dc power sources and stabilize the dc-link power, a Lyapunov-based neuro-fuzzy control strategy has been developed. This controller determines the supercapacitor power that should be generated according to the amount of available energy in dc-link. Also, current control strategies for the FC converter (boost) and supercapacitor converter (buck-boost converter) are designed by proportional-integral and sliding-mode control consequently. Moreover, a complementary control strategy for voltage source converter based on positive and negative symmetrical components is presented to investigate the voltage sag ride-through and voltage control capability. The hybrid system is studied under unbalance voltage sag condition. Simulation results are given to show the overall system performance including active power control and voltage sag ride-through capability of the hybrid DG system. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5623336&sortType%3Das [...] [article] Voltage control and active power management of hybrid fuel-cell/energy-storage power conversion system under unbalanced voltage sag conditions [texte imprimé] / Hajizadeh, A., Auteur ; Golkar, M. A., Auteur ; Feliachi, A., Auteur . - 2011 . - pp. 1195 - 1208.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1195 - 1208
Mots-clés : Distributed power generation; electric current control; energy storage; fuel cell power plants; hybrid power systems; power control; power conversion; power distribution control; power supply quality; supercapacitors; voltage control Résumé : This paper concentrates on the control of hybrid fuel-cell (FC)/energy-storage distributed generation (DG) systems under voltage sag in distribution systems. The proposed control strategy makes hybrid DG system work properly when a voltage disturbance occurs in distribution system, and it stays connected to the main grid. To distribute the power between dc power sources and stabilize the dc-link power, a Lyapunov-based neuro-fuzzy control strategy has been developed. This controller determines the supercapacitor power that should be generated according to the amount of available energy in dc-link. Also, current control strategies for the FC converter (boost) and supercapacitor converter (buck-boost converter) are designed by proportional-integral and sliding-mode control consequently. Moreover, a complementary control strategy for voltage source converter based on positive and negative symmetrical components is presented to investigate the voltage sag ride-through and voltage control capability. The hybrid system is studied under unbalance voltage sag condition. Simulation results are given to show the overall system performance including active power control and voltage sag ride-through capability of the hybrid DG system. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5623336&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1209 - 1217
Titre : Design optimization and dynamic performance analysis of a stand-alone hybrid wind–diesel electrical power generation system Type de document : texte imprimé Auteurs : Saha, T. K., Auteur ; Kastha, D. K., Auteur Année de publication : 2011 Article en page(s) : pp. 1209 - 1217 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Diesel-electric generators; hybrid power systems; nonlinear programming; reactive power; wind power Résumé : An algorithm for optimal sizing of all the components of a stand-alone hybrid wind-diesel electrical power generation system, in the sense of minimum energy cost is reported in this paper. The total system reactive power balance condition, which is not often considered for designing stand-alone systems, is included with others in the nonlinear constrained optimization technique employed to maximize the wind turbine output. The dynamic performance of the hybrid system during different load and wind speed transients under optimal load sharing condition (as predicted by the aforementioned algorithm) between the two generators is verified in real time on a laboratory prototype of the hybrid system. These experimental results are also presented. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5546933&sortType%3Das [...] [article] Design optimization and dynamic performance analysis of a stand-alone hybrid wind–diesel electrical power generation system [texte imprimé] / Saha, T. K., Auteur ; Kastha, D. K., Auteur . - 2011 . - pp. 1209 - 1217.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1209 - 1217
Mots-clés : Diesel-electric generators; hybrid power systems; nonlinear programming; reactive power; wind power Résumé : An algorithm for optimal sizing of all the components of a stand-alone hybrid wind-diesel electrical power generation system, in the sense of minimum energy cost is reported in this paper. The total system reactive power balance condition, which is not often considered for designing stand-alone systems, is included with others in the nonlinear constrained optimization technique employed to maximize the wind turbine output. The dynamic performance of the hybrid system during different load and wind speed transients under optimal load sharing condition (as predicted by the aforementioned algorithm) between the two generators is verified in real time on a laboratory prototype of the hybrid system. These experimental results are also presented. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5546933&sortType%3Das [...]
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1218-1219
Titre : A new criterion for the quantification of broken rotor bars in induction motors Type de document : texte imprimé Auteurs : Tassoni, C., Auteur ; Filippetti, F., Auteur ; Franceschini, G., Auteur Année de publication : 2011 Article en page(s) : pp. 1218-1219 Note générale : energy conversion Langues : Anglais (eng) Note de contenu : Discussion of “A New Criterion for the Quantification of Broken Rotor Bars in Induction Motors” En ligne : http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5635303 [article] A new criterion for the quantification of broken rotor bars in induction motors [texte imprimé] / Tassoni, C., Auteur ; Filippetti, F., Auteur ; Franceschini, G., Auteur . - 2011 . - pp. 1218-1219.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - pp. 1218-1219
Note de contenu : Discussion of “A New Criterion for the Quantification of Broken Rotor Bars in Induction Motors” En ligne : http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5635303
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - p. 1220
Titre : A new criterion for the quantification of broken rotor bars in induction motors Type de document : texte imprimé Auteurs : Boqiang Xu, Auteur ; Liling Sun, Auteur ; Ren Hui, Auteur Année de publication : 2011 Article en page(s) : p. 1220 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Angular measurement; induction motors; machine windings; power factor; power factor measurement Résumé : We review the corresponding references and find out that there exists a mess indeed. The angular displacement refers to the stator winding impedance angle. It is worth mentioning that the power factor angle approximately equals to the equivalent circuit impedance angle disregarding the rotor asymmetry resulted from an incipient rotor fault. Consequently, it is reasonable to regard the angular displacement as the power factor angle. Note de contenu : Closure on “A New Criterion for the Quantification of Broken Rotor Bars in Induction Motors” En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5635302&sortType%3Das [...] [article] A new criterion for the quantification of broken rotor bars in induction motors [texte imprimé] / Boqiang Xu, Auteur ; Liling Sun, Auteur ; Ren Hui, Auteur . - 2011 . - p. 1220.
energy conversion
Langues : Anglais (eng)
in IEEE transactions on energy conversion > Vol. 25, N° 4 (Décembre 2010) . - p. 1220
Mots-clés : Angular measurement; induction motors; machine windings; power factor; power factor measurement Résumé : We review the corresponding references and find out that there exists a mess indeed. The angular displacement refers to the stator winding impedance angle. It is worth mentioning that the power factor angle approximately equals to the equivalent circuit impedance angle disregarding the rotor asymmetry resulted from an incipient rotor fault. Consequently, it is reasonable to regard the angular displacement as the power factor angle. Note de contenu : Closure on “A New Criterion for the Quantification of Broken Rotor Bars in Induction Motors” En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5635302&sortType%3Das [...]
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