ENERGY STORAGE SYSTEM HAVING CONTROL ALGORITHM FOR CHARGING AND DISCHARGING TEST

摘要

Disclosed is a power storage device. According to the present invention, a power storage system includes: N (N is an integer of two or greater) numbers of power storage devices having a plurality of secondary batteries and a BMS, and connected to a power grid; and a central control unit selecting a testing power storage device and a testing auxiliary power storage device to perform a charging and discharging test among the N numbers of the power storage devices, and controlling the charging amount of the auxiliary device in conjunction with the charging amount of the testing device when the testing device is selected. According to the present invention, the charging and discharging test of the power storage device can be performed by using power stored in the power storage system. Therefore, the present invention can be applied without wasting the previously stored power and reduce reliance on external power.