ENERGY STORAGE UNIT, ENERGY STORAGE SYSTEM, AND ELECTRIC ENERGY STORAGE AND CONVERSION SYSTEM

Provided is an energy storage unit A for an energy storage system, and the energy storage unit includes an energy storage bank which is connected to a power conversion device , and a bank management device . The bank management device either calculates, on the basis of a current target value Ino and a current measurement value Int of the energy storage bank , a current limit value Ilimit to limit an excess of a current I with respect to the current target value Ino, or calculates, on the basis of a power target value Pno and a power measurement value Pnt of the energy storage bank , a power limit value Plimit to limit an excess of power with respect to the power target value Pno.