PWM rectifier with inner current loop of IMC decoupling and outer voltage loop based on 2DOF-IMC

A voltage-current double close-loop control structure based on Internal Model Control (IMC) is proposed, mathematical model of PWM rectifier in synchronous dq coordinates is discussed, and cross-voltage decoupling is obtained based on IMC. The current IMC controllers are designed to make current achieve the zero steady-state error. In the voltage-loop, two-degree-freedom(2DOF) Internal Model Control(IMC) method is adopted, input controller is applied to regulate the output tracking, feedback controller to regulate both load disturbance rejection performance and robustness performance. A series of simulation are conducted, and the results indicate the feasibility and effectiveness of the proposed method.