Economic Assessment of Energy Storage System Frequency Regulation in Thermal Generation Station

Frequency control of power grids has become a relevant research topic due to the massive integration of renewable generation in power systems. Frequency control of traditional thermal generating units with relatively slow ramp rate cannot meet the frequency regulation requirements of power grid. Thus, the inclusion of energy storage system (ESS) at the thermal generation frequency control output can be used to improve the speed of load following and increase the profiles of ancillary service. In this paper, the economic assessment of energy storage system investments in thermal generation station is studied. A methodology has been presented here for the financial calculations of the ESS providing frequency regulation. A numerical case study based on frequency profiles of Yunnan power grid is simulated.