A Study on the Methodology of Determining Proper SOC Operation Range Considering the Economic Characteristics and the Charge and Discharge Voltage Characteristics of BESS

Abstract

-With the growing interest of microgrid all over the world, many studies on microgrid operation are being carried out. The battery energy storage system(BESS) is a key equipment for effective operation of the microgrid. In this paper, we analyze the characteristics of the charge and discharge output voltage of the battery and the characteristics of the life-span variation and the investment cost when the state-of-charge (SOC) changes. The formulas to represent the quality of the charge and discharge output voltage of the battery and the economics due to the life-span variation and the investment cost according to DOD(Depth of Discharge) are derived. The methodology of determining the proper operation ranges of the battery SOC with varying the weighting of the quality of its charge and discharge output voltage of the battery and the economics due to its life-span variation and the investment cost is presented using these formulas.

Economic Analysis of Special Rate for Renewable Energy Based on the Design of an Optimized Model for Distributed Energy Resource Capacities in Buildings

“…Equations ( 15)- (17) show that the battery's state-of-charge (SOC) is maintained within the range of economy and quality. The SOC of the ESS are always limited by their minimum and maximum amounts [36].…”