Three-level NPC voltage source converter based direct power control of the doubly fed induction generator at low constant switching frequency

This paper deals with an improvement of the direct power control 'DPC' for three-level voltage source inverter NPC-VSI feeds the rotor of the doubly fed induction generator 'DFIG' based wind power generation system. This converter allows controlling the rotor voltage in magnitude and phase angle with a high flexibility and can therefore be used for active and reactive power control of DFIG. The control is especially designed to reduce the harmonic distortion of the generated currents and active power ripples of the classical DPC control using switching table. In addition, it's convenient for high power drive and variable speed generator applications with constant switching frequency. The detailed operation principle and simulation results of the proposed DPC-NPC strategy for 1.5 MW of DFIG are also discussed. Resume - Cet article traite de l'amelioration du controle de la puissance directe 'DPC' pour trois niveaux de tension de l'onduleur NPC-VSI, alimentant le rotor du generateur asynchrone a double alimentation 'MADA' a base d'energie eolienne. Ce convertisseur permet de controler la tension du rotor en amplitude et en angle de phase avec une grande flexibilite et peut donc etre utilise pour le controle de la puissance active et reactive de la 'MADA'. Le controle est specialement concu pour reduire la distorsion harmonique des courants generes et des ondulations du controle de la puissance active 'DPC' classique en utilisant la table de commutation. En outre, il est commode pour des fortes puissances et des generateurs a vitesse variable avec une frequence de commutation constante. Le principe de fonctionnement detaille et les resultats de simulation de la strategie DPC-NPC propose pour 1,5 MW de la 'MADA' sont egalement discutes.

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