Single-power single-charging direct current system for station and capacity check control method

The invention relates to a single-power single-charging direct-current system for a station, which comprises a storage battery pack, a charging device, a battery inspection device, a discharging device, a direct-current monitoring device and a direct-current bus, and is characterized in that the direct-current monitoring device acquires the output voltage of the charging device, the voltage of the direct-current bus, the voltage of the storage battery pack and the current of the storage battery pack; the state input quantity of the direct current monitoring device comprises a first output switch state, a second output switch state and a discharge switch state; the first output switch, the second output switch and the discharge switch all adopt electric operating mechanisms, and the electric operating mechanisms adopt a double-confirmation mode. The invention further discloses an automatic capacity checking control method and a charging process after capacity checking discharging. According to the invention, c