Energy storage system having a structure that a plurality of battery system is distributed and method for processing thereof

The present invention relates to an energy storage system and its processing method having a structure in which are distributed a plurality of battery systems. An energy storage system includes a generator, a renewable energy source, a plurality of battery systems as a DC load supply a DC power, respectively, a power control system and an energy management system. Each of the battery system is connected to the battery and the serial cross-battery system comprising a battery charger and the battery, and the battery are adjacent to, a battery charger are connected to each other parallel to the generator. The energy storage system is an energy management system is supplied to the direct current power from the battery system and power control system and inter-working to monitor the power supply state, depending on the power supply state renewable energy source, a generator and at least one of a battery to a DC load and controls so as to selectively charging the battery. According to the present invention, by controlling the direct-current load driving and battery charging and discharging according to the power supply state, and the efficient energy management is possible and may quickly respond to an emergency power failure state.