Research on Mechanism and Benefits of Frequency Regulation of Energy Storage Combined with Thermal Power Unit

摘要

Energy storage has fast response characteristics and precise regulation performance, and has unique advantages in power system frequency regulation. Taking the US PJM and the British National Grid as examples, the application of foreign energy storage devices in the frequency regulation service market is analyzed. This paper studies the frequency regulation performance of comprehensive adjustment rate, adjustment precision and response time, and proposes a two-part frequency regulation price mechanism that considers the adjustment effect of "mileage compensation and capacity compensation". On this basis, it analyzes the basic situation of frequency regulation of combined thermal power units in China's energy storage facilities. Taking the province's frequency regulation auxiliary service market as an example, the investment benefit analysis of the energy storage combined thermal power unit under different mileage quotations is carried out. The case results show that the energy storage can greatly improve the overall frequency regulation performance parameters of the project, improve the quotation ranking in the frequency regulation market, and increase the economic benefits of the project.