An Interleaved DAB Converter for Battery Energy Storage System

The objective of this paper is to proposed an interleaved dual-active-bridge (DAB) converter with a reduced number of semiconductor components for battery energy storage system. In this paper, the interleaved configuration reduces the input current ripple as well as increases the overall current rating. Moreover, the individual power-handling capability required for the battery module voltage balance is adopted in this configuration. Considering applications for battery energy storage system, the principle of operation, voltage gain analysis, and design methodology are described. The variable-frequency modulation and phase-shift modulation are used to ensure zero-voltage-switching over a wide power range and individual power control capability for each battery module, respectively. Finally, the experimental results obtained from a 1-kW prototype circuit verify the performance of the proposed DAB converter.