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Performance analysis of solar thermal power plant integrated with a compressed air energy storage system
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Miaohu ZHANG1, Chuanjiang LI2, Yang HAN2, Chao CAO3, Kangkang XUE3, Hao WU3, Wangyang SHI4, Xiaojun XUE4
Thermal Power Generation | 2026, 55(6) : 52 - 62
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Thermal Power Generation | 2026, 55(6): 52-62
• Energy storage technology research •
Performance analysis of solar thermal power plant integrated with a compressed air energy storage system
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Miaohu ZHANG1, Chuanjiang LI2, Yang HAN2, Chao CAO3, Kangkang XUE3, Hao WU3, Wangyang SHI4, Xiaojun XUE4
Affiliations
  • 1.Datang Xinjiang Power Generation Co., Ltd., Urumqi 830501, China
  • 2.Datang Hami New Energy Co., Ltd., Hami 839099, China
  • 3.Northwest Electric Power Test and Research Institute of China Datang Corporation Science and Technology Research Institute Co., Ltd., Xi’an 710016, China
  • 4.School of Electric Power, Civil Engineering and Architecture, Shanxi University, Taiyuan 030006, China
Published: 2026-06-25 doi: 10.19666/j.rlfd.202507068
Outline
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[Objective]

Compressed air energy storage technology is mature and flexible to operate, making it a highly promising energy storage solution. To effectively improve the performance of compressed air energy storage systems, this study proposes an integrated system that couples them with concentrated solar power (CSP) plants.

[Methods]

During the energy storage phase, low-temperature condensate from the solar thermal power plant’s regenerative system is used to cool the high-temperature compressed air at the compressor outlet, thereby recovering and reusing the compression heat. During the energy release phase, the compressed air is heated in stages using high-temperature molten salt and high-temperature feedwater from the CSP plant. Through system integration, the compression heat is effectively utilized, while simultaneously reducing the thermal storage equipment required in the original compressed air energy storage system. A thermodynamic model of the coupled system was constructed, and energy, exergy, and economic analyses were conducted on the proposed coupled system to evaluate its performance.

[Results]

The proposed system achieved a round trip efficiency of 74.95% and an exergy efficiency of 79.78%, with an energy storage density of 8.18 MJ/m3. Furthermore, the system’s dynamic payback period was 4.42 years，and its net present value was 49.358 9 million yuan.

[Conclusion]

The proposed integrated system of solar thermal power station and compressed air energy storage exhibits significant efficiency improvement and good economic performance, providing valuable reference for the development of renewable energy coupled energy storage systems.

compressed air energy storage  /  solar thermal power plant  /  system integration  /  thermodynamic analysis  /  economic analysis
Miaohu ZHANG, Chuanjiang LI, Yang HAN, Chao CAO, Kangkang XUE, Hao WU, Wangyang SHI, Xiaojun XUE. Performance analysis of solar thermal power plant integrated with a compressed air energy storage system[J]. Thermal Power Generation, 2026 , 55 (6) : 52 -62 . DOI: 10.19666/j.rlfd.202507068
Funding
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  • National Natural Science Foundation of China(52406019)
  • Fundamental Research Program of Shanxi Province(202403021212327)
Appendix
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Year 2026 volume 55 Issue 6
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309
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Article Info
doi: 10.19666/j.rlfd.202507068
  • Receive Date：2025-07-24
  • Online Date：2026-08-14
  • Published：2026-06-25
Article Data
Affiliations
History
  • Received：2025-07-24
  • Revised：2025-12-26
  • Accepted：2026-01-13
Funding
National Natural Science Foundation of China(52406019)
Fundamental Research Program of Shanxi Province(202403021212327)
Affiliations
    1.Datang Xinjiang Power Generation Co., Ltd., Urumqi 830501, China
    2.Datang Hami New Energy Co., Ltd., Hami 839099, China
    3.Northwest Electric Power Test and Research Institute of China Datang Corporation Science and Technology Research Institute Co., Ltd., Xi’an 710016, China
    4.School of Electric Power, Civil Engineering and Architecture, Shanxi University, Taiyuan 030006, China
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https://castjournals.cast.org.cn/joweb/rlfd/EN/10.19666/j.rlfd.202507068
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