Optimization strategies for clearing the electric energy and FM market with combined thermal energy and storage

As a new type of regulation resource with two-way regulation function, energy storage is increasingly involved in automatic generation control and has become the key to the future frequency modulation (FM) auxiliary service market. In this paper, we propose an optimization strategy for market clearing of electric energy and frequency modulation based on the combination of thermal storage, which uses the security constrained unit combination (SCUC) model to determine the unit output plan and storage charging and discharging plan, and is based on the security constrained economic dispatch (SCED) model, with the objective of minimizing the total cost of the electric power system for market clearing. The system frequency stability is maintained by adjusting the output of generating units in order to respond quickly to changes in the system frequency. In this paper, we study the issues related to the participation of solo energy storage in the electric energy and frequency modulation market, including the market demand for frequency modulation auxiliary services, resource allocation strategy, security constrained unit combination (SCUC), and security constrained economic dispatch (SCED), etc., and utilize the data of frequency modulation auxiliary services provided by each unit in the power system to calculate the frequency modulation mileage and the capacity clearing price of each unit, as well as to construct the arithmetic example and evaluate its feasibility and economic benefits.