Voltage Balance of DC Microgrid Based on Switching Strategy

This paper mainly focuses on the research of the bus voltage balance in DC microgrid. According to the relationship of power balance of the system, three voltage regulation modes in the microgrid are defined, such as the mode for renewing resources, the mode for energy storage unit charging, and the mode for energy storage unit discharging. Based on three oprerating modes proposed, the microgrid is modeled as a linear switching system. Then the design method of the switching system controller is given and the stability of the switching system is analyzed. Finally, simulation results verify the effectiveness of the switching strategy.