Abstract: The active power filter (APF) has been widely used in power grid harmonic control due to its high control accuracy and good dynamic compensation.In order to apply APF to high-power applications,this paper describes several APF parallel technologies,and selects the capacity ratio scheme and carrier phase shift multiplexing scheme to build a system simulation model under MATLAB/Simulink platform,and the experimental prototype was produced.The simulation and experiment of the compensation of the two APF parallel systems were carried out.The results reach the network requirements,which verifies the feasibility of the proposed method.

Key words: active power filters (APF), parallel operation, capacity ratio, carrier phase shift multiplexing