A 10-kW Active Front End Rectifier Fed Dual Active Bridge Converter For EV Charging

Abstract

This paper presents the implementation of a three-phase grid-connected electric vehicle (EV) battery charging system comprised of two conversion stages, one AC-DC stage with a three-phase Active Front End (AFE) rectifier, and another DC-DC stage with a single-phase Dual Active Bridge (DAB) converter. The DAB is opted for the DC-DC stage because of its high voltage conversion ratio, power density, and galvanic isolation. The LCL filter at the input of the AC-DC stage is designed to suppress the input current harmonics. Decoupled DQ control of the active front-end rectifier is done to get desired DC Link voltage. Closed loop control of the Dual Active Bridge (DAB) with an LC output filter is implemented to improve battery voltage and reduce ripples. Zero Voltage Switching (ZVS) is achieved in all the switches for different load values, which helps the converter have low switching loss and ensures higher efficiency. The system is designed for a 10-kW power rating, and to check the robustness of the converter and controller, the system is simulated under varying load conditions using MATLAB/Simulink.