Direct-current power supply device for parallel connection of storage battery packs of electric power system

The utility model discloses a direct-current power supply device for parallel connection of storage battery packs of an electric power system. The output end of a rectifier module outputs direct current to a direct-current bus; voltage and current signals collected by the voltage sampling module VT and the current sampling module CT are transmitted to the control panel, and the control panel controls on-off of an MOS tube in the current conversion module; the anode of the storage battery is connected with the anode of the direct current bus through the charging and discharging component; the monitoring module senses a signal of the DC bus through the current sensor and the voltage sensor, and outputs the signal to control the start and stop of the rectification module and the adjustment of the output voltage. According to the utility model, the two or more storage battery packs are arranged in parallel, the storage battery packs with different capacities and different new and old storage battery packs can be