In view of the overcharge and over-discharge of individual energy storage units due to differences in the state of charge (SoC)

rated capacity and line impedance of the microgrid multi-energy storage units

which will affect its service life and make the stability adjustment ability of the microgrid deteriorate

this paper proposes a multi-energy storage SoC dynamic balance strategy based on the variable regulating factor. The arccotangent function is used to associate the droop coefficient with SoC and rated capacity

and the virtual voltage drop compensation link is introduced to achieve the balance of multiple sets of energy storage SoC. On this basis

variable regulating factors are designed to speed up the SoC equilibrium speed between ESU. Simulation results verify the proposed control strategy can achieve SoC equilibrium between multiple sets of energy storage units

effectively improve the SoC equilibrium speed and eliminate the effects of line impedance on the SoC equilibrium and current distribution accuracy.