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This paper presents modified SFOC control of Doubly Fed Induction Generator (DFIG) wind turbine during grid unbalance for improved stability by using hybrid PI-Fuzzy controllers and eliminating negative sequence components. The system consists of a common induction generator with slip ring and power electronic converters at both stator and rotor sides. The modifications are applied to rotor side converter for active and reactive power controls of wind turbine. The turbine, generator and control units are also described. The investigation is based on MATLAB/SIMULINK. Simulation results show improved stability of active and reactive powers delivered by DFIG.

Improving Stability for Independent Power Control of Wind-Turbine Doubly Fed Induction Generator during Grid Unbalance With Pi-Fuzzy Controller