A Series Hybrid APF Design for Integrated Compensation of Different Types of Harmonic Sources

In order to achieve an integrated compensation for different types of harmonics generated by nonlinear loads in the grid,a novel series hybrid active power filter(APF) is proposed.The proposed filter can compensate current or voltage type harmonics separately or together.It also eliminates the chances of series and parallel resonance as well.This paper proposes a proportional-integral(PI) control strategy with zero steady-state error of series APF based on the compensation for transformer fundamental flux.The results of input and output impedance transfer functions analysis show that the proposed series hybrid APF system has excellent harmonic resonance rejection characteristics.Simulation and experiment with both current and voltage types of harmonic sources are conducted,and the results show that the proposed system has great performance.