Documents disponibles écrits par cet auteur

Comparison of stator-mounted permanent-magnet machines based on a general power equation / Jianzhong Zhang in IEEE transactions on energy conversion, Vol. 24 N° 4 (Décembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 4 (Décembre 2009) . - pp. 826 - 834 Titre : Comparison of stator-mounted permanent-magnet machines based on a general power equation Type de document : texte imprimé Auteurs : Jianzhong Zhang, Auteur ; Ming Cheng, Auteur ; Zhe, Chen, Auteur Année de publication : 2010 Article en page(s) : pp. 826 - 834 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : permanent  magnet  machines Résumé : The stator-mounted permanent-magnet (SMPM) machines have some advantages compared with its counterparts, such as simple rotor, short winding terminals, and good thermal dissipation conditions for magnets. In this paper, a general power equation for three types of SMPM machine is introduced first, and then, power equations considering the specific topologies are derived. Based on these power equations, theoretical comparisons are carried out between various types of the SMPM machines. In all, eight topologies have been presented and benchmarked. It reveals that the flux switching permanent-magnet (PM) machine owns higher power density than the flux reversal PM machine and the doubly salient PM machine under same outer diameter. The comparison based on the power equation has established a foundation for optimizing the SMPM machines. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5291767&sortType%3Das [...] [article] Comparison of stator-mounted permanent-magnet machines based on a general power equation [texte imprimé] / Jianzhong Zhang, Auteur ; Ming Cheng, Auteur ; Zhe, Chen, Auteur . - 2010 . - pp. 826 - 834. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 4 (Décembre 2009) . - pp. 826 - 834 Mots-clés : permanent  magnet  machines Résumé : The stator-mounted permanent-magnet (SMPM) machines have some advantages compared with its counterparts, such as simple rotor, short winding terminals, and good thermal dissipation conditions for magnets. In this paper, a general power equation for three types of SMPM machine is introduced first, and then, power equations considering the specific topologies are derived. Based on these power equations, theoretical comparisons are carried out between various types of the SMPM machines. In all, eight topologies have been presented and benchmarked. It reveals that the flux switching permanent-magnet (PM) machine owns higher power density than the flux reversal PM machine and the doubly salient PM machine under same outer diameter. The comparison based on the power equation has established a foundation for optimizing the SMPM machines. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5291767&sortType%3Das [...]

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

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

Optimization of multibrid permanent-magnet wind generator systems / Li, Hui in IEEE transactions on energy conversion, Vol. 24 N°1 (Mars 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N°1 (Mars 2009) . - pp. 82 - 92 Titre : Optimization of multibrid permanent-magnet wind generator systems Type de document : texte imprimé Auteurs : Li, Hui, Auteur ; Zhe, Chen, Auteur ; Polinder, H., Auteur Année de publication : 2009 Article en page(s) : pp. 82 - 92 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Gears;  genetic  algorithms;  permanent  magnet  generators;  power  convertors;  wind  turbines Résumé : This paper investigates the cost-effective ranges of gearbox ratios and power ratings of multibrid permanent-magnet (PM) wind generator systems by using a design optimization method. First, the analytical model of a multibrid wind turbine concept consisting of a single-stage gearbox and a three-phase radial-flux PM synchronous generator with a back-to-back power converter is presented. The design optimization is adopted with a genetic algorithm for minimizing generator system cost. To demonstrate the effectiveness of the developed electromagnetic design model, the optimization results of a 500-kW direct-drive PM generator and a 1.5-MW multibrid PM generator with various gear ratios are, respectively, compared with those from other methods. Then, the optimal design approach is further employed for a range from 750 kW up to 10 MW. The optimization results of PM generator systems including direct-drive and multibrid wind turbine configurations are obtained, and the suitable ranges of gear ratios for different power ratings are investigated. Finally, the detailed comparisons of the most cost-effective multibrid PM generator system and the optimized direct-drive PM generator system are also presented and discussed. The comparative results have shown that the multibrid wind turbine concept appears more cost-effective than the direct-drive concept. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4783055&sortType%3Das [...] [article] Optimization of multibrid permanent-magnet wind generator systems [texte imprimé] / Li, Hui, Auteur ; Zhe, Chen, Auteur ; Polinder, H., Auteur . - 2009 . - pp. 82 - 92. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N°1 (Mars 2009) . - pp. 82 - 92 Mots-clés : Gears;  genetic  algorithms;  permanent  magnet  generators;  power  convertors;  wind  turbines Résumé : This paper investigates the cost-effective ranges of gearbox ratios and power ratings of multibrid permanent-magnet (PM) wind generator systems by using a design optimization method. First, the analytical model of a multibrid wind turbine concept consisting of a single-stage gearbox and a three-phase radial-flux PM synchronous generator with a back-to-back power converter is presented. The design optimization is adopted with a genetic algorithm for minimizing generator system cost. To demonstrate the effectiveness of the developed electromagnetic design model, the optimization results of a 500-kW direct-drive PM generator and a 1.5-MW multibrid PM generator with various gear ratios are, respectively, compared with those from other methods. Then, the optimal design approach is further employed for a range from 750 kW up to 10 MW. The optimization results of PM generator systems including direct-drive and multibrid wind turbine configurations are obtained, and the suitable ranges of gear ratios for different power ratings are investigated. Finally, the detailed comparisons of the most cost-effective multibrid PM generator system and the optimized direct-drive PM generator system are also presented and discussed. The comparative results have shown that the multibrid wind turbine concept appears more cost-effective than the direct-drive concept. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4783055&sortType%3Das [...]