ENERGY STORAGE SYSTEM FOR OPTIMUM OPERATION OF DEMAND RESPONSE RESOURCE AND OPERATING METHOD THEREOF

An energy storage system is provided as a demand response resource which is associated with a virtual power plant (VPP) system. The energy storage system can include a power generation device for producing electric power, a battery for storing power, an energy management apparatus for monitoring a power generation state and a power consumption state and to establish an operation schedule for the battery, and a power converter for controlling charging/discharging operation of the battery according to the established operation schedule.