Patent ID: 7772806

Claim:
A power storage system comprising: a DC-DC converter unit regulating DC power from a DC power supply into prescribed voltage and current; and a power storage unit storing DC power regulated by the DC-DC converter unit, wherein the power storage system, on the DC power supply side (the primary side) of the DC-DC converter unit, includes: a primary side current detecting unit for detecting a current of a main circuit; a primary side voltage detecting unit for detecting a voltage of the main circuit; a primary side switch unit for opening and closing the main circuit; and a primary side filter unit for reducing harmonics of the main circuit, the power storage system, on the power storage unit side (the secondary side) of the DC-DC converter unit, includes: a secondary side filter unit for reducing harmonics of the main circuit; a secondary side switch unit for opening and closing the main circuit; a secondary side voltage detecting unit for detecting a voltage of the main circuit; and a secondary side current detecting unit for detecting a current of the main circuit, and the power storage system includes a system control unit for controlling on/off states of at least the primary side switch unit, the secondary side switch unit and the DC-DC converter unit, inputted operational commands from outside of the power storage system and signals from the primary side current detecting unit, the primary side voltage detecting unit, the primary side switch unit, the primary side filter unit, the DC-DC converter unit, the secondary side filter unit, the secondary side switch unit, the secondary side voltage detecting unit, the secondary side current detecting unit and the power storage unit.