Patent ID: 9595842
Date: 2017-03-14
CPC Classifications: G01R,H01M,H02J,Y02E

Claim:
1. An electricity storage system comprising: a state detection device that detects directly or indirectly a charging/discharging current or charging/discharging power of another electricity storage system connected to a power system; a bidirectional inverter that performs power conversion when charge/discharge of a storage battery managed by the electricity storage system is performed from/to the power system; and a control device that controls driving the bidirectional inverter so as to compensate for charging/discharging the other electricity storage system in response to the charging/discharging current or the charging/discharging power detected by the state detection device, wherein the state detection device is installed on wiring at a position closer to the power system than a connection point between an external load that generates or consumes power to/from the power system and the other electricity storage system, and the control device calculates an average value of current or power detected by the state detection device in a predetermined cycle, and controls driving the bidirectional inverter so as to cancel a difference if an absolute value of the difference between the current or the power and the average value exceeds a predetermined threshold.