ENERGY STORAGE SYSTEM

The present invention relates to an energy storage system. An energy storage system according to an embodiment of the present invention relates to an energy storage system for managing a grid and power of a direct current (DC) power distribution network associated with the grid, the energy storage system comprising: a first converter connected between a grid and the DC power distribution network so as to control voltage of the DC power distribution network; a second converter connected to the DC power distribution network so as to detect voltage of the DC power distribution network; a battery connected to the second converter, wherein the second converter controls charging/discharging of the battery; a rectifier connected in parallel to the first converter; and a first higher layer controller for controlling the first converter, the second converter, and the rectifier, and determining a limit voltage of the DC power distribution network and whether to drive the rectifier, on the basis of a state of the first converter.