Voltage Harmonic Suppression Method of Power Conversion System Based on CLCR Filter

The output voltage harmonics of power converters will seriously affect the power quality and system stability. Aiming at improving the output harmonic characteristics of power converters, this paper proposes a novel design method of CLCR-type filter. The proposed filter can decrease the volume of the passive filter and suppress both the differential-mode voltage and common-mode voltage. Based on the differential-mode equivalent circuit and common-mode equivalent circuit of the filter, the design method and limiting conditions of filter parameter are presented in this paper. Both analytical and experimental results indicate that the output harmonics of both differential-mode voltage and common-mode voltage can be reduced by the CLCR-type filter. Therefore, the power quality of the system with power converters is significantly improved.