A Three-Way DC/DC Converter with Tri-Battery Energy Storage for Hybrid Electric Vehicle System

This study is about a bidirectional DC/DC converter that is used to interface three energy storage systems(ESS) ie a main and two auxiliary batteries, and the converter also produces various voltage levels at its output terminal. The three-way DC/DC converter can operate in a low voltage battery source powering mode during motoring operation and it can operate in a buck mode ie high voltage regeneration mode. The BDC converter has the ability of dual directional power flow control. In addition to dual directional power flow there is an independent power flow between the energy storage systems. The circuit configuration, operation and steady-state analysis of the BDC are discussed individually in different modes of operation with a BLDC motor load. A Simulink model for a 1 kW prototype is designed and the results obtained from rigorous simulation are used to validate the BDC topology.