Documents disponibles écrits par cet auteur

Enhanced control and operation of DFIG-based wind farms during network unbalance / Xu, Lie in IEEE transactions on energy conversion, Vol. 23 n°4 (Décembre 2008) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1073 - 1081 Titre : Enhanced control and operation of DFIG-based wind farms during network unbalance Type de document : texte imprimé Auteurs : Xu, Lie, Auteur Année de publication : 2009 Article en page(s) : pp. 1073 - 1081 Note générale : Energy conversion Langues : Anglais (eng) Mots-clés : Asynchronous  generators;  convertors;  power  system  control;  wind  power Résumé : This paper investigates the control and operation of doubly fed induction generator (DFIG)-based wind generation systems under unbalanced voltage conditions. DFIG system behaviors under unbalanced voltage are analyzed and different control targets are discussed. A new rotor current control strategy containing a main controller and an auxiliary controller is proposed. The main controller is implemented in the positive (dq)+ frame without involving positive/negative sequence decomposition, whereas the auxiliary controller is implemented in the negative (dq)- frame with negative sequence current extracted. The impact of providing unbalanced control on converter voltage rating is investigated. Simulation results using EMTDC/PSCAD are presented for a 2-MW DFIG wind generation system to validate the proposed control scheme and to demonstrate the enhanced system operation during ldquosmallrdquo steady state and ldquolargerdquo transient unbalances. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675801&sortType%3Das [...] [article] Enhanced control and operation of DFIG-based wind farms during network unbalance [texte imprimé] / Xu, Lie, Auteur . - 2009 . - pp. 1073 - 1081. Energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 23 n°4 (Décembre 2008) . - pp. 1073 - 1081 Mots-clés : Asynchronous  generators;  convertors;  power  system  control;  wind  power Résumé : This paper investigates the control and operation of doubly fed induction generator (DFIG)-based wind generation systems under unbalanced voltage conditions. DFIG system behaviors under unbalanced voltage are analyzed and different control targets are discussed. A new rotor current control strategy containing a main controller and an auxiliary controller is proposed. The main controller is implemented in the positive (dq)+ frame without involving positive/negative sequence decomposition, whereas the auxiliary controller is implemented in the negative (dq)- frame with negative sequence current extracted. The impact of providing unbalanced control on converter voltage rating is investigated. Simulation results using EMTDC/PSCAD are presented for a 2-MW DFIG wind generation system to validate the proposed control scheme and to demonstrate the enhanced system operation during ldquosmallrdquo steady state and ldquolargerdquo transient unbalances. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4675801&sortType%3Das [...]

Predictive current control of doubly fed induction generators / Xu, Lie in IEEE transactions on industrial electronics, Vol. 56 N° 10 (Octobre 2009) 

Public ISBD [article]  in IEEE transactions on industrial electronics > Vol. 56 N° 10 (Octobre 2009) . - pp. 4143 - 4153 Titre : Predictive current control of doubly fed induction generators Type de document : texte imprimé Auteurs : Xu, Lie, Auteur ; Zhi, Dawei, Auteur ; Williams, Barry W., Auteur Article en page(s) : pp. 4143 - 4153 Note générale : Génie électrique Langues : Anglais (eng) Mots-clés : Doubly  fed  induction  generators  (DFIGs)  Predictive  current  control  (PCC)  Voltage-source  converters  (VSCs) Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : This paper presents a predictive current control (PCC) strategy for doubly fed induction generators (DFIGs). The method predicts the DFIG's rotor current variations in the synchronous reference frame fixed to the stator flux within a fixed sampling period. This is then used to directly calculate the required rotor voltage to eliminate the current errors at the end of the following sampling period. Space vector modulation is used to generate the required switching pulses within the fixed sampling period. The impact of sampling delay on the accuracy of the sampled rotor current is analyzed and detailed compensation methods are proposed to improve the current control accuracy and system stability. Experimental results for a 1.5-kW DFIG system illustrate the effectiveness and robustness of the proposed control strategy during rotor current steps and rotating speed variation. Tests during negative-sequence current injection further demonstrate the excellent dynamic performance of the proposed PCC method. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4808115 [article] Predictive current control of doubly fed induction generators [texte imprimé] / Xu, Lie, Auteur ; Zhi, Dawei, Auteur ; Williams, Barry W., Auteur . - pp. 4143 - 4153. Génie électrique Langues : Anglais (eng) in IEEE transactions on industrial electronics > Vol. 56 N° 10 (Octobre 2009) . - pp. 4143 - 4153 Mots-clés : Doubly  fed  induction  generators  (DFIGs)  Predictive  current  control  (PCC)  Voltage-source  converters  (VSCs) Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : This paper presents a predictive current control (PCC) strategy for doubly fed induction generators (DFIGs). The method predicts the DFIG's rotor current variations in the synchronous reference frame fixed to the stator flux within a fixed sampling period. This is then used to directly calculate the required rotor voltage to eliminate the current errors at the end of the following sampling period. Space vector modulation is used to generate the required switching pulses within the fixed sampling period. The impact of sampling delay on the accuracy of the sampled rotor current is analyzed and detailed compensation methods are proposed to improve the current control accuracy and system stability. Experimental results for a 1.5-kW DFIG system illustrate the effectiveness and robustness of the proposed control strategy during rotor current steps and rotating speed variation. Tests during negative-sequence current injection further demonstrate the excellent dynamic performance of the proposed PCC method. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4808115