SOE balancing scheme for lithium-ion batteries in microgrids based on VSG

Traditional virtual synchronous generator (VSG) control can increase system inertia and is widely used in microgrid inverter control. Both traditional VSG control schemes and VSG based state of charge (SOC) balancing schemes are unable to achieve state of energy (SOE) balancing in lithium batteries. This article proposes a VSG based SOE balancing scheme for lithium-ion batteries in microgrids to address this issue. The intrinsic relationship between VSG control and SOE was studied, and a consistency algorithm was introduced to obtain the SOE balance adjustment term to regulate the active power output of the inverter, thereby achieving SOE balance of lithium-ion batteries in microgrids. After SOE balancing, the proposed control algorithm automatically changes to traditional VSG control to ensure system frequency quality. Finally, the effectiveness of the proposed scheme was verified through the results obtained from the Simulink toolbox in Matlab simulation software.