| 摘要 |
PROBLEM TO BE SOLVED: To provide a system power storage device capable of adjusting charging power equivalent to that of a user power storage device from a power system control location, while having a conventional function without changing the function.SOLUTION: A system power storage device which is connected to a user power storage device through a DC line and adjusts a frequency or voltage of a power system on the basis of an instruction value from a power system control location comprises: a transformer for connecting a power system power transmission line and AC bus; a plurality of power storage device units connected to the AC bus; and a power storage device unit controller. Each of the power storage device units comprises a bidirectional inverter, storage battery, and storage battery control device. A user shared power storage device unit is configured by connecting one or more power storage device units to an inverter of the user power storage device through the DC line. The power storage unit controller comprises direct supply means for supplying DC power from a bidirectional inverter of the user shared power storage device unit to the inverter of the user power storage device without using the storage battery. |
