Control Strategy for BESS-Fed Inverters in AC Microgrids with SoC Consideration

This paper presents a control strategy for an inverter in a battery energy storage system (BESS) within an AC microgrid, focusing on state of charge (SoC) management. The proposed control strategy employs a droop control method to regulate the active and reactive power exchanged between the inverter and the grid, considering the SoC of the BESS. The effectiveness of the control strategy is verified through a simulation using a modified CIGRE microgrid benchmark in Matlab®/ Simulink. Various case studies are performed to examine the system's ability to track reference output power values. The simulated case studies show the correlation between the SoC and the delivered output power of the inverters. The findings demonstrate that the control strategy not only balances the SoC of multiple BESS but also plays a crucial role in prolonging the battery life by operating within safe operating points of SoC. This, in turn, contributes to maintaining grid stability and effectively managing the SoC of the BESSs.