Variable Structure Fuzzy-PID Control for DFIG system

In order to most effectively utilize the wind energy and improve the eficiency of wind generation system, an optimum control strategy of doublyfed induction generators (DFIG) was proposed,which made the system operation for both the maximum wind enemy captured below the rated wind speed. Based on the wind turbine characteristics and basic electromagnetic relationship of DFIG the mathematical models of the stator active power and reactive power of DFIG were derived to fulfill maximal wind energy capture and conversion. A dual-passage excitation fuzzy control strategy based on dynamic synchronous reference frame was applied to control the proposed optimal stator active and reactive power. The operational performan ces of the wind turbine system with DFIG with wind speed variation were analyzed an d compared by using Matlab/Simulink. The results show the correctness and feasibility of the proposed control strategy.