A new type of control strategy of DFIG in wind power system based on SMC

The variable speed constant frequency (VSCF) wind power generation system requires the DFIG with characteristics of high response speed as well as strong robustness. Under the mutual effects of internal interference of parametric variation and external interference of load torque oscillation, the dynamic current response of PI control becomes worse, as well as reduced efficiency and stability. Aiming at the above problems, this paper proposed an integral sliding-mode variable structure controller under exponential approximation law, and using the boundary-layer design to reduce the chattering of sliding-mode control (SMC). The simulation shows that not only are the dynamic performance and anti-interference ability of DFIG improved, but also the chattering is effectively reduced by adopting this control strategy with simple design process and easy implementation.