Application of Active Disturbance Rejection Controller in Three-Phase PWM Rectifier

Abstract

For the three-phase voltage type PWM rectifier which is a strong nonlinear, a strong coupling and time-varying system, a double-loop control structure of DC voltage outer loop and current inner loop is designed to control it. In practice, the traditional PID controller is commonly used. However, it is relatively sensitive to changes in system parameters and the control effect is not ideal. This paper proposes to use the auto disturbance rejection control instead of the traditional PID control. The auto disturbance rejection controller is based on the improvement of the PID controller. It inherits the core concept of PID error feedback control. And it solves the problem of contradiction between response fastness and overshoot by using a processing method that arranges a transition process. I compare the results of the two controllers by simulation, which proves that the scheme of auto disturbance rejection control is more suitable for the PWM rectifier system than the traditional PID control. The auto disturbance rejection controller has better dynamics, stability, and faster response times.