Generalized Fuzzy Proportional Integral Control for Harmonic Current Compensation in Hybrid Active Power Filers

A traditional proportional integral (PI) regulator has a long history of use, but has the disadvantage of a steady state error if the reference is a periodic signal. This paper proposes a novel generalized fuzzy proportional integral tracking control for periodic signal. The controller has three control units: proportional control unit, general integral control unit and fuzzy adjustor unit. The controller achieves dynamic response by using the proportional control unit and minimizes the steady state error for periodic reference signal and periodic disturbances by using the general integral control unit. The parameters of proportional control unit and general integral control unit are adjusted through the fuzzy adjustor unit to get well adaptive abilities and well robustness. This controller is used to track compensation harmonic current in hybrid active power filters (HAPF). The steady state and dynamic experiment waveforms were gotten in a laboratory prototype, rated at 10kVA. Experiment results proved the feasibility and validity of the novel control strategies.