A novel nonlinear control method for the output voltage of three-phase voltage-source PWM rectifier

Aiming at the nonlinear output voltage equation of PWM rectifier, based on the topology with voltage-current double-loop control, a novel control method-fuzzy/PI+direct nonlinear control method for the output voltage is present. If the active current error is smaller than a threshold, PI+direct nonlinear control is used in order to ensure the linear control and stabilization precision of the output voltage. If the active current error is larger than the threshold, fuzzy+direct nonlinear control is applied for the nonlinear disturber thanks to current error and other uncertain reasons. In d-q synchronous reference frame, a decoupled control method is applied, which constrains the active current and the reactive current be controlled linearly and separately. The MATLAB simulation results indicate that the controller has super performance