ENERGY STORAGE SYSTEM COMPRISING NEW INSTALLATION BATTERY RACK, AND METHOD FOR CONTROLLING SAME

An energy storage system according to an embodiment of the present invention may comprise: a plurality of first battery racks; a plurality of battery protective units for managing the plurality of first battery racks, respectively; a plurality of second battery racks; a plurality of DC/DC converters for managing the plurality of second battery racks, respectively; and a battery section management device which is linked to the plurality of battery protective units and the plurality of DC/DC converters so as to monitor the output of the plurality of DC/DC converters and the plurality of battery protective units, and which controls the output of the plurality of DC/DC converters.