Fractional-order PID and Active Disturbance Rejection Control for Active Power Filter

This paper proposed a fractional-Order PID controller and Active Disturbance Rejection Control (ADRC) method for current compensation of Active Power Filter (APF). The control method consists of two closed loop. One is a reference current tracking loop based on the ADRC controller, which can treat the internal and external uncertainties of the system as a whole for the convenient control. The other is the voltage controlling loop with the Fractional Order PID controller for more flexibility. By comparing with other control method, simulation results verify that the presented control method has excellent dynamic performance and strong robustness in the presence of model uncertainty as well as external disturbances.