Super twisting sliding mode MPPT control of an IM based wind energy conversion system

This work develops a high nonlinear method based active and reactive decoupled current controller for a variable speed and fixed pitch wind energy conversion system (WECS) with an doubly fed induction generator (DFIG). The control objective is to maximize the total active power delivered by the system at the meanwhile regulate the reactive power injected by the voltage oriented controlled (VOC) converters into the grid. The nonlinear control technique applied is a super twisting algorithm (STA) sliding mode control (SMC) at a fixed switching frequency, which promise a strong robustness against both the systematic variations and the external perturbation of wind speed. The simulation results evidence the dynamic robustness.