A current control method based on fuzzy adapative Pi and repetitive control for active power filter

摘要

Active power filter (APF) is a kind of effective equipment to eliminate distorted current (harmonic and reactive current) generated by power electronic devices. The control part of APF is traditionally achieved by PI controller. The invert circuit is a typical nonlinear part which directly brings difficulty of tuning PI coefficient and affects the compensation performance. Considering this disadvantage, a hybrid control method combining fuzzy adaptive PI control and repetitive control is proposed in this paper. With fuzzy control applied to PI control, fuzzy adaptive PI control could tune PI coefficient online to strengthen the robustness. And the control accuracy is also improved through repetitive control. Thus, the proposed control strategy can get a better effect. Simulation demonstrates the validity of the proposed method.