LCL Filter Design in Three-phase AC/DC Power Factor Correction for Electric Vehicle Fast Charging Application

Abstract

This paper presents an LCL filter design for a 40 kW three-phase grid-interactive converter, which is used in electric vehicle off-board fast chargers. As compared to the conventional filter, the LCL filter is widely used in the AC/DC power factor correction converter due to its harmonic attenuation performance and system stability. The LCL filter parameters are designed based on the system power, AC input frequency, PWM frequency, and it was performed by simulating and detailed theoretical analysis. The control method of the system is a double current closed-loop control method to achieve a good response for AC converter side current and DC side voltage. The system performance analysis is including the fast dynamic response, the efficiency of the system, the DC ripple voltage, and AC current harmonic. The simulation results are shown to verify the proposed filter design method.