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Operation of grid-connected DFIG under unbalanced grid voltage condition / Yi Zhou 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. 240 - 246 Titre : Operation of grid-connected DFIG under unbalanced grid voltage condition Type de document : texte imprimé Auteurs : Yi Zhou, Auteur ; Bauer, P., Auteur ; Ferreira, J. A., Auteur Année de publication : 2009 Article en page(s) : pp. 240 - 246 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Asynchronous  generators;  machine  control;  machine  protection;  machine  theory;  wind  power Résumé : Doubly fed induction generator (DFIG) still shares a large part in today's wind power market. It provides the benefits of variable speed operation cost-effectively, and can control its active and reactive power independently. Crowbar protection is often adopted to protect the rotor-side voltage source converter (VSC) from transient overcurrent during grid voltage dip. But under unbalanced grid voltage condition, the severe problems are not the transient overcurrent, but the electric torque pulsation and dc voltage ripple in the back-to-back VSCs. This paper develops dynamic models in MATLAB/Simulink, validates it through experiments, investigates the behavior of DFIG during unbalanced grid voltage condition, and proposes new controllers in separated positive and negative sequence. Methods to separate positive and negative sequence components in real time are also developed, and their responses to unsymmetrical voltage dip are compared. Simulation results prove that the separated positive and negative sequence controllers limit the torque pulsation and dc voltage ripple effectively. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4770180&sortType%3Das [...] [article] Operation of grid-connected DFIG under unbalanced grid voltage condition [texte imprimé] / Yi Zhou, Auteur ; Bauer, P., Auteur ; Ferreira, J. A., Auteur . - 2009 . - pp. 240 - 246. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N°1 (Mars 2009) . - pp. 240 - 246 Mots-clés : Asynchronous  generators;  machine  control;  machine  protection;  machine  theory;  wind  power Résumé : Doubly fed induction generator (DFIG) still shares a large part in today's wind power market. It provides the benefits of variable speed operation cost-effectively, and can control its active and reactive power independently. Crowbar protection is often adopted to protect the rotor-side voltage source converter (VSC) from transient overcurrent during grid voltage dip. But under unbalanced grid voltage condition, the severe problems are not the transient overcurrent, but the electric torque pulsation and dc voltage ripple in the back-to-back VSCs. This paper develops dynamic models in MATLAB/Simulink, validates it through experiments, investigates the behavior of DFIG during unbalanced grid voltage condition, and proposes new controllers in separated positive and negative sequence. Methods to separate positive and negative sequence components in real time are also developed, and their responses to unsymmetrical voltage dip are compared. Simulation results prove that the separated positive and negative sequence controllers limit the torque pulsation and dc voltage ripple effectively. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4770180&sortType%3Das [...]