High-Performance Power Electronic Battery Pack Based on a Back-to-Back Converter

Abstract

This work studies a full-power, module-integrated back-to-back converter for battery energy storage applications. The proposed solution optimizes bank usage across a wide range of individual battery capacities. The converter design and control are examined, as well as the use of a loss reduction method when operating under a partial load. The suggested architectural work allows the bank to have a regulated voltage output, simulating a passive bank, while controlling the charge and discharge of individual batteries to their maximum capacities. Those capabilities are also evaluated using linear programming optimization, in order the quantify the advantage. The suggested system is used in a typical use-case examined experimentally. The energy provided by an experimental lead acid bank rose 38 times after a few charge/discharge cycles.

Keywords

• battery storage plants
• DC–DC power conversion
• equalizers