Research Of The Critical Control Technology For Active Power Filter APF

This paper focuses on the research of the control strategy for active power filter APF,Mainly study the improvement program for harmonic current control problem?DC voltage control problem, and LCL filter control problem,in order to obtain high-quality harmonic compensation performance.In this paper, Propose a dual hysteresis indefinite frequency SVPWM control algorithm for the harmonic current control problem,The hysteretic control combined with SVPWM control, inherited both their advantages,which has a fast current response?low switching frequency?high system efficiency features,and also has a high stability and good robust performance;Design a novel DC voltage controller for DC voltage control problem,the phase margin of voltage loop is large,therefore, the stabilizing effect of DC capacitor voltage is good,which has a high stability;Propose an active damping method based on dual-loop with capacitor current inner feedback, This method can effectively suppress resonance peaks, which has a good stability, low cost and high efficiency.Based on the theoretical study of the algorithms for APF control, Conduct the system simulation and experiment,In order to verify the feasibility of the proposed control strategy applied to the APF system.Research work in this paper that has a certain role for APF device in industrial applications, and has some practical value to improve power quality.