Direct-current storage battery energy recovery system for factory

The utility model discloses a station DC storage battery energy recovery system, which comprises a DC storage battery unit, a DC/AC inversion unit, a power frequency transformation phase lock unit and a station AC system, and is characterized in that the DC storage battery unit comprises a storage battery pack, and a storage battery positive pole grid-connected switch and a storage battery negative pole grid-connected switch which are connected with the storage battery pack; the DC/AC inverter unit comprises a DC/AC inverter, and a positive electrode switch and a negative electrode switch which are connected with the DC/AC inverter; the power frequency transformation phase lock unit comprises a power frequency transformer and a PLL (Phase Locked Loop) connected with the power frequency transformer; and a plant AC system. The system has the advantages that electric energy recovery in the discharge test of the station-service direct-current storage battery is realized, electric energy waste is avoided, a specia