For keeping AC chopping reactive power compensator output sine reactive power compensation current and as for the high harmonic order of AC chopper

the second order LC filter is adopted for the purpose of filtering higher harmonic. In this paper

the improvement design method for a kind of AC chopping circuit input filter is proposed

the parameters of capacitor is defined firstly in accordance with compensation grade of reactive power compensation of system

the inductance parameter is designed from both points of the reactive power compensation ability and compensation current THD

and the parameters of LC is limited through taking intersection in accordance with the compensation range defined by the cutoff frequency of LC filter

keeping the filter combine the ability of both reactive power compensation and high frequency harmonic elimination. The feasibility and efficiency of the optimized method are verified by the simulation and experimental result.