A Multiport Isolated DC-DC Converter for Plug-in Electric Vehicles Based on Combination of Photovoltaic Systems and Power Grid

Abstract

In this study, a multiport isolated DC-DC converter is proposed for charging of plug-in electric vehicles, which can interface among the photovoltaic (PV) systems, vehicle batteries, and power grid. The proposed converter is dual-output, and vehicle batteries can charge from both PV systems and grid simultaneously or separately. Moreover, the converter is bidirectional, capable of delivering power from vehicle batteries to grid by using the half-bridge CLLLC resonant topology with less switching devices. Furthermore, a unified multi-input multi-output (MIMO) controller is used for control of converter. The main topology, operating scenarios, and control system of converter are presented. To validate the performance of the converter, the system is simulated by MATLAB/Simulink software and results are illustrated to prove the controller accuracy during different operation modes.