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Performance and Key Parameter Analysis of Composite Underwater Compressed Air Energy Storage

Yunfei Li, Xiaotao Chen, Linrui Ma, Ming Li, Shengwei Mei
International Core Journal of Engineering, (2025), Vol.11, No.4, pp.314-329
Published: March 19, 2025
DOI: 10.6919/ICJE.202504_11(4).0038
PDF: Download Full Text PDF
Abstract

Due to the operation mode of " Water-to-Power Determination " in hydropower plants, the phenomenon of solar and hydro power Curtailment requires a large-scale and high-efficiency energy storage system for auxiliary regulation. To solve this problem, this paper proposes a composite underwater compressed air energy storage system coupling concentrating solarthermal system (CCS) and electric heating (EH). Firstly, the electric-electric efficiency of constant volume air storage is reduced due to the operation of off-design conditions in the process of energy storage and release, the system uses the constant pressure environment of the hydropower plant reservoir and adopts the air storage scheme of underwater flexible airbag. Secondly, to improve the consumption capacity and thermodynamic performance of the system, based on the advanced adiabatic underwater flexible compressed air energy storage(AA-UFCAES), the CCS and EH are coupled to fully preheat the high-pressure air during the expansion power generation. Furthermore, The thermodynamic performance of the three heat supply schemes without external heat source, coupled CCS, coupled CCS and EH heat source is compared and analyzed. The results show that the electric-electric efficiency, the round-cycle efficiency and energy storage density of the system coupled with CCS and EH are significantly improved compared with the previous two systems. Finally, to determine the optimal working state of the system, the influence of key parameters of the system is studied, and the feasibility of the proposed scheme is verified by simulation.

Keywords: Compressed Air Energy Storage; Constant Pressure Air Storage; Concentrating Solar Thermal System and Electric Heating; Thermodynamic Analysis.
APA Citation: Yunfei Li, Xiaotao Chen, Linrui Ma, Ming Li, Shengwei Mei (2025). Performance and Key Parameter Analysis of Composite Underwater Compressed Air Energy Storage. International Core Journal of Engineering, 11(4), 314-329. https://doi.org/10.6919/ICJE.202504_11(4).0038

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