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Evaluating the pressure fluctuations during load rejection of two pump-turbines in a prototype pumped-storage system by using 1D-3D coupled simulation

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  • Liu, Demin
  • Zhang, Xiaoxi
  • Yang, Zhiyan
  • Liu, Ke
  • Cheng, Yongguang

Abstract

Load rejection is one of the dangerous transient scenarios in pumped-storage power stations (PSPSs), and the risk should be evaluated from design to operation stages of PSPSs. In this study, the extreme case with simultaneous load rejection of two pump-turbines in a prototype pumped-storage system was simulated by using the one-dimensional and three-dimensional (1D-3D) coupled computational fluid dynamics (CFD) method. The aims are to evaluate the risk of pressure fluctuations during this scenario comprehensively and assess the feasibility of the newly developed 1D-3D coupled approach in engineering applications. The results show that the maximal pressures (superimposed by water hammer and pulsating pressures) upstream of the runner exceed the industry standard. The largest maximal pressure and the longest overpressure duration occur in the vaneless space and are caused by the strong rotor-stator interaction (RSI). The strong RSI may be attributed to the unevenly distributed high gradient regions of pressure aroused by the uneven radial velocity pattern with obvious reverse flow at the runner inlet. This attempt revealed the mechanism of severe pressure pulsations during transient processes and demonstrated that the 1D-3D coupled method is feasible for engineering applications, especially in evaluating the transient risk of new ultrahigh-head PSPSs.

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  • Liu, Demin & Zhang, Xiaoxi & Yang, Zhiyan & Liu, Ke & Cheng, Yongguang, 2021. "Evaluating the pressure fluctuations during load rejection of two pump-turbines in a prototype pumped-storage system by using 1D-3D coupled simulation," Renewable Energy, Elsevier, vol. 171(C), pages 1276-1289.
    • Handle: RePEc:eee:renene:v:171:y:2021:i:c:p:1276-1289
    DOI: 10.1016/j.renene.2021.02.114
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    References listed on IDEAS

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    Cited by:

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    2. Cui, Zilong & Guo, Wencheng, 2023. "Multi-objective control of transient process of hydropower plant with two turbines sharing one penstock under combined operating conditions," Renewable Energy, Elsevier, vol. 206(C), pages 1275-1288.
    3. Xiaoxia Hou & Yongguang Cheng & Zhiyan Yang & Ke Liu & Xiaoxi Zhang & Demin Liu, 2021. "Influence of Clearance Flow on Dynamic Hydraulic Forces of Pump-Turbine during Runaway Transient Process," Energies, MDPI, vol. 14(10), pages 1-20, May.
    4. Meng Zhang & Jinhai Feng & Ziwen Zhao & Wei Zhang & Junzhi Zhang & Beibei Xu, 2022. "A 1D-3D Coupling Model to Evaluate Hydropower Generation System Stability," Energies, MDPI, vol. 15(19), pages 1-13, September.
    5. Zhang, Fangfang & Fang, Mingkun & Pan, Jiale & Tao, Ran & Zhu, Di & Liu, Weichao & Xiao, Ruofu, 2023. "Guide vane profile optimization of pump-turbine for grid connection performance improvement," Energy, Elsevier, vol. 274(C).
    6. Jin, Faye & Wang, Huanmao & Luo, Yongyao & Presas, Alexandre & Bi, Huili & Wang, Zhengwei & Lin, Kai & Lei, Xingchun & Yang, Xiaolong, 2023. "Visualization research of energy dissipation in a pump turbine unit during turbine mode's starting up," Renewable Energy, Elsevier, vol. 217(C).

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