Isolated bidirectional battery converter control for standalone solar PV applications

This paper focuses on the efficient use of battery storage system for overcoming the intermittency conditions in the standalone solar PV applications. A dual-active bridge (DAB) based isolated DC-DC converter has been used for the high power transfer efficiency, bidirectional power flow, fast dynamic control, and smaller size. However for energy storage applications, the circulating power of the DAB based DC-DC converter at the input and output ends are the major concern. This paper uses a modified phase-shift control algorithm for DAB converter in order to reduce the back power flow/ circulating power and improve the battery performance over long time. The operation of the standalone solar PV system with the proposed battery converter control has been verified through the PSCAD based simulation results in both the charging and discharging mode.