State of Charge Based Active Power Sharing Control Between Two Battery Energy Storage Units and Solar PV Array Based Standalone System

Several smart building and hospital applications develop dedicated small uninterrupted power based microgrids (MGs) for sensitive loads and critical applications, where the grid disturbances are not reflected at load side. However, power flow coordination is critical in such applications to enhance the battery life as well as to make the system self-sufficient throughout the daily operation. Therefore, this work proposes a dual battery energy storage and a solar PV array based standalone microgrid configuration with rule-based power flow coordination between sources considering the battery constraints for efficient and prolonged operation of the system. The developed control also ensures compensation of the load irregularities like unbalance/harmonics/reactive power to improve the voltage quality for the connected sensitive loads.