Application of High-Order Sliding Mode variable structure Control B ased on Power- function in Doubly Fed Induction Generator

摘要

A high-order sliding mode variable structure control strategy for rotor side converter of doubly-fed wind power system is proposed in two-phase stationary reference frame (αβ-frame) to realize maximum power-point tracing by analyzing the mathematical model of doubly-fed induction generator(DFIG). The control strategy adopts double closedloop structure. External loop is power loop, which adopts stator voltage orientation control vector control method. And its control structure is mature and stable, control performance is good and robustness is strong. The inner loop is current loop, which adopts a high-order sliding mode variable structure control method to control the voltage reference value of the rotor. Advantages of the method is that the dynamic response is relatively strong and the robustness is good. The proposed high-order sliding mode variable structure control strategy can not only realize the decoupling of active and reactive power of the doubly-fed wind turbine, but also improve the antiinterference performance of the speed control of the power generation system, and ultimately realize the maximum power point tracking and stable control. Finally, the correctness and validity of the proposed control strategy are verified by matlab/simulink simulation results.