DONVEY energy storage system could reduce peak load demand, improve the utilization rate of existing grid equipment and power grid operation efficiency,improve the efficiency of power quality and power consumption. Also it will effectively reduce the power and the power grid construction, to enhance the overall asset utilization of the power grid, completely change the existing power system construction pattern, promoting the transformation from denotationdilated to connotation. DONVEY Energy Storage system consist of Power Conversion System, Monitoring Control System, Auxiliary System, Battery and Battery Management System.