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Methodology for smooth connection of doubly fed induction generators to the grid / Tapia, Gerardo 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. 959 - 971 Titre : Methodology for smooth connection of doubly fed induction generators to the grid Type de document : texte imprimé Auteurs : Tapia, Gerardo, Auteur ; Santamaria, Giovanna, Auteur Année de publication : 2010 Article en page(s) : pp. 959 - 971 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : PI  control;  asynchronous  generators;  electric  current  control;  machine  vector  control;  power  generation  control;  power  grids;  rotors;  synchronisation;  voltage  control;  wind  turbines Résumé : A systematic methodology for smooth connection of wind-turbine-driven doubly fed induction generators (DFIGs) to the grid is presented. Synchronization of the voltage induced in the DFIG open stator to that of the grid, which needs to be accomplished prior to connection, is thoroughly examined. A particular grid-voltage-oriented rotor control scheme is considered for this purpose. Generic tuning equations for the rotor current integral-proportional (I-P) controllers involved in this scheme are also derived. Transition between the control configurations devoted to synchronization and normal operation-active power generation and reactive power interchange with the grid-at the instant of connection is studied in detail. Mainly due to the reference frame selected for synchronization, the greater part of this transition takes place naturally. However, given that the rotor current dynamics vary significantly depending on whether the DFIG stator is connected to the grid or not, the parameters of the I-P controllers involved in both schemes will accordingly be different. Consequently, a ldquobumplessrdquo strategy is provided that preserves the smoothness of the connection. A simple method for initial rotor positioning, required when performing vector control based on an incremental encoder, is also suggested. The resulting overall methodology is validated on a 7-kW DFIG-based laboratory-scale test bench. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5291775&sortType%3Das [...] [article] Methodology for smooth connection of doubly fed induction generators to the grid [texte imprimé] / Tapia, Gerardo, Auteur ; Santamaria, Giovanna, Auteur . - 2010 . - pp. 959 - 971. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 4 (Décembre 2009) . - pp. 959 - 971 Mots-clés : PI  control;  asynchronous  generators;  electric  current  control;  machine  vector  control;  power  generation  control;  power  grids;  rotors;  synchronisation;  voltage  control;  wind  turbines Résumé : A systematic methodology for smooth connection of wind-turbine-driven doubly fed induction generators (DFIGs) to the grid is presented. Synchronization of the voltage induced in the DFIG open stator to that of the grid, which needs to be accomplished prior to connection, is thoroughly examined. A particular grid-voltage-oriented rotor control scheme is considered for this purpose. Generic tuning equations for the rotor current integral-proportional (I-P) controllers involved in this scheme are also derived. Transition between the control configurations devoted to synchronization and normal operation-active power generation and reactive power interchange with the grid-at the instant of connection is studied in detail. Mainly due to the reference frame selected for synchronization, the greater part of this transition takes place naturally. However, given that the rotor current dynamics vary significantly depending on whether the DFIG stator is connected to the grid or not, the parameters of the I-P controllers involved in both schemes will accordingly be different. Consequently, a ldquobumplessrdquo strategy is provided that preserves the smoothness of the connection. A simple method for initial rotor positioning, required when performing vector control based on an incremental encoder, is also suggested. The resulting overall methodology is validated on a 7-kW DFIG-based laboratory-scale test bench. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5291775&sortType%3Das [...]