Self-adaptive layered power supply recovery method and device for direct-current power distribution network

The invention provides a self-adaptive layered power supply recovery method and device for a direct-current power distribution network, and belongs to the field of energy storage system control. The method comprises the following steps: when it is monitored that a DC bus voltage is continuously smaller than a rated voltage within a preset time interval, controlling each energy storage system to perform primary adjustment based on a respective preset droop coefficient to increase respective output power; based on the power balance equations of all the load nodes and all the energy storage system nodes, determining a sensitivity matrix of each energy storage system to the DC bus voltage; based on the sensitivity matrix, a voltage setting target of the DC bus and a limit target of the output power of each energy storage system, determining the variable quantity of the operation reference power of each energy storage system and the variable quantity of the voltage of the DC bus; and performing secondary adjustmen