Study of sliding-mode control based grid-side PWM rectifier for wind power generation system under unbalanced input voltage condition

A sliding mode control scheme is presented in alphabeta frame for grid-side PWM rectifiers in wind power generation systems. The positive and negative sequence voltages are needed to design the controller, nevertheless, the positive and negative sequence currents are not needed. This scheme is compared with the dual current control scheme in the rotating frame d-q. The simulation results show that sliding mode control scheme can realize unit power factor operation when the amplitude is unbalanced.