Direct-current power supply control method and device, medium, processor and direct-current power supply system

The invention provides a control method and device of a direct-current power supply, a medium, a processor and a direct-current power supply system. The method comprises the following steps: acquiring an actual output current and an actual output voltage of the direct-current power supply; when the actual output current is smaller than the rated current and lasts for a first duration, a first preset current value is determined according to the actual output voltage, first limiting power and first limiting current, the first limiting power is larger than the rated power, and the first limiting current is larger than the rated current; when the actual output current is larger than the rated current and lasts for a second duration, a second preset current value is determined according to the actual output voltage, second limiting power and second limiting current, the second limiting power is smaller than or equal to the rated power, and the second limiting current is smaller than or equal to the rated current;