GA optimized design of stator voltage oriented integral sliding mode control for DFIG based wind energy conversion system

Active and Reactive Power generated by a doubly fed induction generator (DFIG) based wind turbine can be precisely controlled through the control of currents in the rotor. Using vector control strategies, rotor currents can be decoupled for independent control. This paper presents design of an integral sliding mode controller (SMC) for grid connected DFIG with stator voltage space vector orientation strategy. The controller parameters are designed using Genetic Algorithm (GA) optimization approach. The proposed SMC is further compared with the conventional PI regulator. The simulation analysis done using MATLAB-Simulink shows the SMC can track the reference rotor currents more accurately with robustness to parameter variations.