A numerical study to compensate duck curve of ESS integrated gas turbine system with reused-battery

Abstract

Due to the intermittentness and variability of renewable energy sources(RES), flexible power generation is possible, and the importance of an integrated system capable of storing reserve power is increasing. In particular, the instability of the power system is intensifying due to the duck curve phenomenon (the net load between sunrise and sunset decreases rapidly and the demand for power increases for about 3 h after sunset). Therefore, this paper presents the ESS integrated gas turbine (EIGT) system, which is an integrated system of energy storage system (ESS) using micro gas turbine (MGT) and reused battery. This research contributes to verifying the utility of reused battery and compensating a duck curve through operation in a system that integrates an energy storage system using micro gas turbine and reused battery, which are small power sources that can be operated independently of the existing renewable energy. According to the result of this research, the state of health (SOH), state of charge (SOC), internal resistance, temperature, and heating rate of the reused battery were verified by supplying power, which is increased by about 66 % after sunset in a duck curve phenomenon. Accordingly, it may contribute to stabilizing the power system in the duck curve phenomenon.