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Extreme water-hammer pressure during one-after-another load shedding in pumped-storage stations

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  • Zeng, Wei
  • Yang, Jiandong
  • Tang, Renbo
  • Yang, Weijia

Abstract

The intermittent and unpredictable wind and solar power leads to the frequent transient processing of pumped-storage stations, increasing the probability of load shedding. When one turbine sheds its load, the other turbines in the same hydraulic unit become overloaded and may shed their loads, which is referred to as a “one-after-another (OAA)” load-shedding process. An extremely high water-hammer pressure (WHP), namely, high spiral case pressure (SCP) or low draft tube pressure (DTP), may arise in this case, directly threatening the safety of the PSS. The objective of this study was to theoretically determine the hydraulic connections between the turbines and reveal the mechanism of the rapid rise in the WHP under the OAA load-shedding conditions. Theoretical derivations inferred that the drastic pressure changes in a trail shedding turbine (TST) are caused by the hydraulic connection with the lead shedding turbine (LST) in the S region. Furthermore, numerical simulations and model experiments were performed for the OAA load-shedding process, which confirmed the validity of the theoretical analysis. Finally, an analysis was conducted on the distribution of the water inertia in the upstream and downstream branch pipes, and engineering measures were proposed to guarantee the safe operation of PSS systems.

Suggested Citation

  • Zeng, Wei & Yang, Jiandong & Tang, Renbo & Yang, Weijia, 2016. "Extreme water-hammer pressure during one-after-another load shedding in pumped-storage stations," Renewable Energy, Elsevier, vol. 99(C), pages 35-44.
    • Handle: RePEc:eee:renene:v:99:y:2016:i:c:p:35-44
    DOI: 10.1016/j.renene.2016.06.030
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    References listed on IDEAS

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    Cited by:

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    5. Rezghi, Ali & Riasi, Alireza & Tazraei, Pedram, 2020. "Multi-objective optimization of hydraulic transient condition in a pump-turbine hydropower considering the wicket-gates closing law and the surge tank position," Renewable Energy, Elsevier, vol. 148(C), pages 478-491.
    6. He, Xianghui & Hu, Jinhong & Zhao, Zhigao & Lin, Jie & Xiao, Pengfei & Yang, Jiandong & Yang, Jiebin, 2023. "Water column separation under one-after-another load rejection in pumped storage station," Energy, Elsevier, vol. 278(C).
    7. Rezghi, Ali & Riasi, Alireza, 2018. "The interaction effect of hydraulic transient conditions of two parallel pump-turbine units in a pumped-storage power plant with considering “S-shaped” instability region: Numerical simulation," Renewable Energy, Elsevier, vol. 118(C), pages 896-908.
    8. Hu, Jinhong & Yang, Jiebin & Zeng, Wei & Zhao, Zhigao & Yang, Jiandong, 2021. "Hydraulic interaction of two parallel pump-turbines in constant-speed oscillation: Measurement, simulation, and sensitivity analysis," Renewable Energy, Elsevier, vol. 176(C), pages 269-279.
    9. Liu, Baonan & Zhou, Jianzhong & Xu, Yanhe & Lai, Xinjie & Shi, Yousong & Li, Mengyao, 2022. "An optimization decision-making framework for the optimal operation strategy of pumped storage hydropower system under extreme conditions," Renewable Energy, Elsevier, vol. 182(C), pages 254-273.
    10. Sheng Chen & Jian Zhang & Gaohui Li & Xiaodong Yu, 2019. "Influence Mechanism of Geometric Characteristics of Water Conveyance System on Extreme Water Hammer during Load Rejection in Pumped Storage Plants," Energies, MDPI, vol. 12(15), pages 1-22, July.

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