A DC bus signaling control strategy for DC microgrids with consideration of battery state of charge balancing

In a DC microgrid, it is essential to have a coordinated control for multiple distributed generations and energy storage systems. This paper presents a DC bus signaling control strategy for DC microgrids with consideration of the state of charge (SoC) balancing among multiple battery energy storage units to ensure reliable current sharing among various sources. In the proposed method, operation modes of the DC microgrid are based on DC bus voltage deviation, and seamless transition can be achieved. Moreover, battery SoC balancing can be achieved, and overcharging or over-discharging of batteries can be avoided. MATLAB/Simulink simulation results are presented to show the effectiveness of the proposed method.