Bidirectional DC-DC Converter with Extended Voltage Conversion Ratio for Energy Storage Applications

Abstract

An improved hybrid bidirectional DC-DC converter is proposed in this paper which is suitable to be deployed in energy storage applications interfacing the DC bus of a microgrid. The converter utilizes voltage boosting techniques such as a switched-capacitor network and coupled inductor to achieve a large voltage conversion ratio. Furthermore, the converter requires a small number of components and a simple PWM controller. The steady-state analysis of the converter is presented and derived. The performance of the converter is also compared with other similar converters. Simulation is carried out using Matlab Simulink which verifies the theoretical analysis of the converter.