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Start-up and shut-down dynamic characteristics of micro compressed air energy storage systems

Author

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  • Zheng, Yanlin
  • Guo, Huan
  • Li, Gen
  • Yang, Tao
  • Xu, Yujie
  • Chen, Haisheng

Abstract

Micro compressed air energy storage (Micro CAES) system is a significant contributor to small-scale energy storage applications because of its various advantages. Currently, few researchers focused on the dynamic characteristics of the start-up and shut-down processes of CAES systems, however, which is vital for the utilization of Micro CAES in frequently variable conditions. This paper establishes a complete dynamic model with electrical control strategy for the start-up and shut-down processes of Micro CAES, and studies the thermodynamic characteristics in depth, as well as the impact of the start-up time ratio on the system exergy efficiency. The results show that the start-up time of Micro CAES is approximately 45 s and 80 s for the charging and discharging process, respectively. When the compressor starts up, there is a maximum power point at each stage. When the compressor and the expander shut down, the pressure drop at each stage is not synchronous, resulting in fluctuations in the compression and expansion ratios. The start-up process has a negative impact on cumulative exergy efficiency, but when the start-up time ratio is less than 30 %, this impact can be ignored. Meanwhile, a system scheme with enhanced performance is proposed to couple with lithium battery.

Suggested Citation

  • Zheng, Yanlin & Guo, Huan & Li, Gen & Yang, Tao & Xu, Yujie & Chen, Haisheng, 2026. "Start-up and shut-down dynamic characteristics of micro compressed air energy storage systems," Renewable Energy, Elsevier, vol. 256(PI).
    • Handle: RePEc:eee:renene:v:256:y:2026:i:pi:s0960148125023559
    DOI: 10.1016/j.renene.2025.124691
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    References listed on IDEAS

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