An Investigation on The Performances of Single and Dual-Parallel Current Source Converter for Ev Battery Charging

Abstract

     In this paper, the application of current source converter (CSC) for EV battery charging is explored. This allows the exploitation of the inherent Buck-Rectifier (i.e. rectifier with voltage step-down capability) characteristic of CSC, which is ideal for interfacing low voltage DC sources like EV battery with higher voltage AC grid. To increase redundancy, hence improving the system’s reliability, a dual-parallel CSC configuration is considered and compared with similar operation using just single CSC. It is found that by phase-shifting the PWM carrier for the dual-parallel CSC, the DC-link current ripple can be reduced. Using simulation results in PLECS, the effect of carrier phase shifting is explored, where minimum DC-link current ripple is found to be attainable at 180° phase shift. At the same time, the CSC was able to draw sinusoidal current from the grid without creating severe power quality issues.