Analysis and Design of a Non-Isolated Bidirectional DC-DC Converter with High Voltage Ratio for Battery Storage System

Abstract

The energy storage system strengthens the grid resiliency and reliability and also has the ability to reduce greenhouse gas emissions. But the most energy storage sources such as batteries and ultra-capacitors, have low terminal voltage. To integrate these energy sources into hybrid system necessitate high voltage conversion ratio power electronic topologies to meet the load requirement of the system. Practically, the traditional step-up or step-down DC-DC converters are not feasible to meet a wide range of conversions. A hybrid structure of a bi-directional high-gain DC-DC converter (HGBDC) has been developed by integrating capacitors and inductors. This converter offers enhanced conversion ratio at lower duty ratios and enables bi-directional energy transfer with a simplified component layout while utilizing fewer semiconductors and passive components. The operational principles, steady-state analysis, and performance of this topology have been thoroughly explained. Additionally, a comprehensive comparative study has been conducted with the recent literature to show superiority of proposed converter. To validate the performance and feasibility of the proposed bidirectional converter MATLAB/Simulink simulation results for output power of 500 W are presented.