Nonlinear PID control for three-phase PWM rectifier based on predictive current control

This paper proposes a nonlinear PID control strategy for three-phase voltage source PWM rectifier based on predictive current control. The nonlinear controller is consisted of nonlinear track differentiators (TD) and special nonlinear function of the error. It improves dc voltage response velocity, restrains overshoot and enhances robustness against load change. In addition, the sinusoidal ac current and unity power factor is also achieved. The simulation results are provided to verify the validity of the proposed control strategy.