High performance fuzzy sliding mode control of DFIG supplied by seven level NPC inverter

This article presents the powers control of a variable speed wind turbine (WT) based on a doubly fed induction generator (DFIG) because of their advantages in terms of economy and control. The considered system consists of a double fed induction generator whose stator is connected directly to the network and its rotor is supplied by seven-level inverter with structure NPC are well used to minimize the harmonics absorbed by the DFIG. In order to control the power ‡owing between the stator of the DFIG and the grid. Have been studied and compared two types of controllers : Sliding Mode Control (SMC) and Fuzzy SMC (FSMC). Their respective performances are compared in terms of power reference tracking, response to sudden speed variations, sensitivity to perturbations and robustness against machine parameters variations.