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Numerical investigation of dynamic characteristics for expansion power generation system of liquefied air energy storage

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  • Cui, Shuangshuang
  • Lu, Chang
  • Shi, Xingping
  • Du, Dongmei
  • He, Qing
  • Liu, Wenyi

Abstract

Liquefied air energy storage (LAES), as a type of compressed air energy storage, has comprehensive advantages. It is suitable for various situations regarding electric energy storage, such as generation, transmission, and user-side applications. It is necessary to learn the operating characteristics of LAES for safe, stable, and controllable operations. In this study, a dynamic model of a 12.5 MW LAES system is established and used to simulate various operating conditions in the expansion phase. The results show that the startup period and rotating speed overshoot of the expander affect each other during the startup process. This can be balanced using a segmented startup scheme, so that the rotating speed overshoot can be controlled within a permissible safe range while shortening the startup period as much as possible. When the segmented startup scheme is “9000 rpm/min–3000 rpm/min,” the startup time is shortest, at 145 s. A ±0.03 Hz dead zone for frequency regulation is considered in the application of the LAES system to the primary frequency regulation of power grid to avoid frequent regulation of the control system, and the primary frequency regulation process is controlled to be within 20 s, meeting the requirements of the power grid. As the action of the emergency closing valve of the protection system in the process of power generation is triggered by the off-grid of the expansion generator owing to an unexpected event, the delay time of the valve action must be controlled to remain within the permissible safe range. This ensures that the expansion generator is safe, and avoids the rotor over-speed caused by the delay of the valve action. The dynamic model and its simulation results can be used to support operation control strategies for LAES systems for primary frequency regulation.

Suggested Citation

  • Cui, Shuangshuang & Lu, Chang & Shi, Xingping & Du, Dongmei & He, Qing & Liu, Wenyi, 2021. "Numerical investigation of dynamic characteristics for expansion power generation system of liquefied air energy storage," Energy, Elsevier, vol. 226(C).
    • Handle: RePEc:eee:energy:v:226:y:2021:i:c:s0360544221006216
    DOI: 10.1016/j.energy.2021.120372
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    References listed on IDEAS

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    1. Qi, Meng & Park, Jinwoo & Lee, Inkyu & Moon, Il, 2022. "Liquid air as an emerging energy vector towards carbon neutrality: A multi-scale systems perspective," Renewable and Sustainable Energy Reviews, Elsevier, vol. 159(C).
    2. Chen, Jiaxiang & Yang, Luwei & An, Baolin & Hu, Jianying & Wang, Junjie, 2022. "Unsteady analysis of the cold energy storage heat exchanger in a liquid air energy storage system," Energy, Elsevier, vol. 242(C).
    3. Cui, Shuangshuang & He, Qing & Shi, Xingping & Liu, Yixue & Du, Dongmei, 2021. "Dynamic characteristics analysis for energy release process of liquid air energy storage system," Renewable Energy, Elsevier, vol. 180(C), pages 744-755.
    4. Lu, Chang & He, Qing & Cui, Shuangshuang & Shi, Xingping & Du, Dongmei & Liu, Wenyi, 2021. "Evaluation of operation safety of energy release process of liquefied air energy storage system," Energy, Elsevier, vol. 235(C).
    5. Kheshti, Mostafa & Zhao, Xiaowei & Liang, Ting & Nie, Binjian & Ding, Yulong & Greaves, Deborah, 2022. "Liquid air energy storage for ancillary services in an integrated hybrid renewable system," Renewable Energy, Elsevier, vol. 199(C), pages 298-307.
    6. Li, Da & Duan, Liqiang, 2022. "Design and analysis of flexible integration of solar aided liquid air energy storage system," Energy, Elsevier, vol. 259(C).

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