Direct-current micro-grid bus management method and energy supply system

The invention provides a DC micro-grid bus management method and an energy supply system, and the method comprises the following steps: when an AC power supply normally supplies power to a DC bus through an energy conversion module, the energy conversion module controls the bus voltage to be stabilized at a first voltage value, the bidirectional energy storage direct current conversion unit is in a normal charging and discharging state, a charging state or a discharging state; when the alternating current power supply cannot normally supply power to the direct current bus through the energy conversion module and the bus voltage is lower than a second voltage value, the bidirectional energy storage direct current conversion unit is switched to a special output state, at the moment, the battery unit exchanges energy with the direct current bus through the bidirectional energy storage direct current conversion unit, and the bus voltage reaches a third voltage value; and when the AC power supply normally supplies