Sliding mode control for maximum wind energy capture of DFIG-based wind turbine

A second-order sliding mode (SOSM) control scheme has been proposed in this paper to maximize wind energy capture of a doubly-fed induction generator (DFIG)-based wind turbine (WT) simultaneously minimizing the reactive power. Maximal wind energy capture is realized by controlling the rotor speed of a variable speed wind turbine (VSWT) at optimal speed. Reactive power minimum is achieved by tracking the d-axis rotor reference current. A super-twisting exact robust differentiator is employed to calculate the differential of rotor speed error. Simulation results based on 1.5MW three-blade wind turbine parameters verify robustness of the proposed control approach.