A HIGH-EFFICIENCY ACTIVE POWER DISPATCH METHOD FOR LARGE SCALE BATTERY ENERGY STORAGE SYSTEMS

Abstract

A large scale battery energy storage system, which can output power at MW-order, has many Power Conditioning Systems (PCSs). The authors have proposed an active power dispatch method for PCS. The active power distribution method uses information of Need of Charge (NOC) and Maximum Efficiency Power point (MEP), and the method is called NOC-MEP method. The NOC-MEP method showed higher charge/discharge efficiency than the conventional method in which active power is equally distributed to each PCS. The NOC-MEP method has been installed in the battery system at Nishi-Sendai substation of Tohoku Electric Power Co. Inc. This paper reports the charge/discharge efficiency of the battery system at Nishi-Sendai substation, which employs the NOC-MEP method.