Highly Efficient ZVS-ZCS Bidirectional DC-DC Converter for E-Vehicles

Abstract

In this paper, hybrid energy storage system (ESS), consisting of battery and super capacitor (SC) is used in a standalone photovoltaic system. Since the battery energy storage system is composed by high energy density and low power density and also degradation occurs due to frequent and partial charge/discharge cycles. By integrating super capacitor energy storage system which has high charge/discharge rates, a system having high energy and power capabilities is designed. In this paper non-isolated soft-switching bidirectional DC-DC converter is integrated which is suitable for high step-up and step-down applications. The whole system results in overall life span enhancement of the battery and also reduction in size and cost of the battery. The control scheme is verified using MATLAB/Simulink models.