Documents disponibles écrits par cet auteur

Integral sliding-mode direct torque control of doubly-fed induction generators under unbalanced grid voltage / Si Zhe, Chen in IEEE transactions on energy conversion, Vol. 25 N° 2 (Juin 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25 N° 2 (Juin 2010) . - pp. 356 - 368 Titre : Integral sliding-mode direct torque control of doubly-fed induction generators under unbalanced grid voltage Type de document : texte imprimé Auteurs : Si Zhe, Chen, Auteur ; Cheung, N. C., Auteur ; Ka Chung, Wong, Auteur Année de publication : 2010 Article en page(s) : pp. 356 - 368 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : asynchronous  generators;  machine  control;  power  grids;  reactive  power;  torque  control;  variable  structure  systems Résumé : An integral sliding-mode direct torque control (ISM-DTC) scheme with space-vector modulation for wind-energy conversion systems based on doubly-fed induction generators (DFIGs) under unbalanced grid voltage is proposed. The torque and power pulsations at twice the grid frequency caused by unbalanced grid voltage can be minimized by the proposed ISM-DTC scheme. Compared with existing control schemes of DFIGs under unbalanced grid voltage, the parametric uncertainties are included into the design procedure of sliding-mode controller, which guarantees the robustness of the controller. Because the torque and reactive power are directly controlled by the rotor voltage, the measurement, coordinate transformation, and symmetrical component extraction of rotor current are eliminated, which simplifies the structure of the controller. Simulation and hardware implementation results validate the effect and parametric robustness of the proposed ISM-DTC scheme. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5353677&sortType%3Das [...] [article] Integral sliding-mode direct torque control of doubly-fed induction generators under unbalanced grid voltage [texte imprimé] / Si Zhe, Chen, Auteur ; Cheung, N. C., Auteur ; Ka Chung, Wong, Auteur . - 2010 . - pp. 356 - 368. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25 N° 2 (Juin 2010) . - pp. 356 - 368 Mots-clés : asynchronous  generators;  machine  control;  power  grids;  reactive  power;  torque  control;  variable  structure  systems Résumé : An integral sliding-mode direct torque control (ISM-DTC) scheme with space-vector modulation for wind-energy conversion systems based on doubly-fed induction generators (DFIGs) under unbalanced grid voltage is proposed. The torque and power pulsations at twice the grid frequency caused by unbalanced grid voltage can be minimized by the proposed ISM-DTC scheme. Compared with existing control schemes of DFIGs under unbalanced grid voltage, the parametric uncertainties are included into the design procedure of sliding-mode controller, which guarantees the robustness of the controller. Because the torque and reactive power are directly controlled by the rotor voltage, the measurement, coordinate transformation, and symmetrical component extraction of rotor current are eliminated, which simplifies the structure of the controller. Simulation and hardware implementation results validate the effect and parametric robustness of the proposed ISM-DTC scheme. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5353677&sortType%3Das [...]

Novel modeling and damping technique for hybrid stepper motor / Tsui, K.W.-H. in IEEE transactions on industrial electronics, Vol. 56 N°1 (Janvier 2009) 

Public ISBD [article]  in IEEE transactions on industrial electronics > Vol. 56 N°1 (Janvier 2009) . - pp. 202 - 211 Titre : Novel modeling and damping technique for hybrid stepper motor Type de document : texte imprimé Auteurs : Tsui, K.W.-H., Auteur ; Cheung, N. C., Auteur ; Yuen, K.C.-W., Auteur Année de publication : 2009 Article en page(s) : pp. 202 - 211 Note générale : electronics Langues : Anglais (eng) Mots-clés : digital  control;  machine  control;  open  loop  systems;  stepping  motors Résumé : It is well known that commercial hybrid stepper system has one or more low-speed resonant points. However, this characteristic cannot be accurately modeled without high-order equations or complicated measurement of motor parameters. In this paper, a novel approach is proposed to model the behavior of a commercial 1.8deg hybrid stepper motor accurately and efficiently. Also, model-based damping algorithms for both open-loop control and servo control are proposed. Simulation and experimental results show that the proposed algorithms can effectively eliminate low-speed resonance and vibration of the stepper system. The algorithms are efficient enough to be implemented on commercial DSP-based controllers without sacrificing motion control performance. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4667637&sortType%3Das [...] [article] Novel modeling and damping technique for hybrid stepper motor [texte imprimé] / Tsui, K.W.-H., Auteur ; Cheung, N. C., Auteur ; Yuen, K.C.-W., Auteur . - 2009 . - pp. 202 - 211. electronics Langues : Anglais (eng) in IEEE transactions on industrial electronics > Vol. 56 N°1 (Janvier 2009) . - pp. 202 - 211 Mots-clés : digital  control;  machine  control;  open  loop  systems;  stepping  motors Résumé : It is well known that commercial hybrid stepper system has one or more low-speed resonant points. However, this characteristic cannot be accurately modeled without high-order equations or complicated measurement of motor parameters. In this paper, a novel approach is proposed to model the behavior of a commercial 1.8deg hybrid stepper motor accurately and efficiently. Also, model-based damping algorithms for both open-loop control and servo control are proposed. Simulation and experimental results show that the proposed algorithms can effectively eliminate low-speed resonance and vibration of the stepper system. The algorithms are efficient enough to be implemented on commercial DSP-based controllers without sacrificing motion control performance. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4667637&sortType%3Das [...]