Battery balancing algorithm for parallel operation of single phase UPS inverters

Abstract

A current sharing method considering battery state of charge(SOC) for single phase uninterruptable power supply(UPS) module is proposed. Each of UPS module system is consists of single master and multi slave modules. A master module performs output voltage control and current sharing algorithm considering the battery SOC of each of the UPS modules. In current sharing algorithm, current commands are generated for eliminating SOC difference of batteries of each modules. However, the slave modules control the on…