A Novel Bi-Directional Converter for Electric Vehicle to Grid Applications

Abstract

This paper presents a power converter system that implements bidirectional energy flow between electric vehicle and single phase grid. The proposed topology and control ensures that all major grid requirements such as unity power factor, power quality and total harmonic distortion at grid side are achieved. It also features constant charging current for battery, constant DC link voltage, fast transition in power flow from one direction to another and independent control for power supplied to grid, battery charging current and DC link voltage. The control loop and configuration are such that the system can provide boosting at multiple points and thereby the DC link voltage remains constant irrespective of the power flow direction and turns ratio of the high frequency transformer. Simulated results validate the feasibility of the system and effectiveness of its control. The nonlinearities of the system is taken into account in the simulations. © 2020 IEEE.