This paper proposed a fractional-order PID controller and active disturbance rejection control (ADRC) method for the current\ncompensation of active power filter (APF). The control method consists of two closed loops. One is a reference current tracking\nloop based on the ADRC controller, which can treat the internal and external uncertainties of the system as a whole.The other is the\nvoltage control loop with the fractional-order PID controller for more flexibility. Simulation results demonstrate that the proposed\ncontrol method has a stronger robustness and higher compensating precision comparing with the double-loop PID controlmethod.
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