SOC fast equalization strategy for droop-free control of direct-current microgrid energy storage system

The invention discloses an SOC fast equalization strategy for droop-free control of a DC micro-grid energy storage system. The strategy mainly comprises a communication module, a current sharing module, a voltage compensation module, an SOC equalization module and a voltage and current double-closed-loop module. In the communication module, each energy storage unit is only in point-to-point communication with adjacent nodes, and the average value of the SOC and the virtual state variable of the energy storage system can be obtained without a central controller; in the current sharing module, a transition factor is introduced, so that the output current is proportionally and accurately distributed according to the capacity of the energy storage unit; in the voltage compensation module, the drop of the bus voltage is effectively compensated, and the bus voltage is controlled to be close to a rated value; in the SOC equalization module, the current closed-loop control of the energy storage unit is directly influ