Control of Three-Level Bidirectional Buck-Boost Converter for Battery Energy Storage System in Bi-Polar DC Microgrid

Abstract

This paper presents the control and performance analysis of a three-level bidirectional buckboost converter integrated with a battery energy storage system (BESS) in a bi-polar DC microgrid. The proposed system enables bidirectional power flow between renewable energy sources, DC loads, and the battery system while maintaining voltage balance across the bi-polar DC bus. A model predictive current control strategy is employed to achieve fast dynamic response, reduced voltage imbalance, and improved power quality under varying source and load conditions. Simulation results demonstrate the effectiveness of the proposed control scheme in regulating DC-link voltages and ensuring stable microgrid operation.