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Surge wave characteristics for hydropower plant with upstream double surge tanks connected in series under small load disturbance

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  • Liu, Yi
  • Zhang, Jian
  • Liu, Zhe
  • Chen, Long
  • Yu, Xiaodong

Abstract

The surge tanks play a crucial role in moderating the oscillation in hydropower plants after load disturbance. Due to the immense flow inertia in extra-long headrace tunnels, hydropower plants with upstream double surge tanks connected in series (UDSTS) are put forward. This paper aims to study surge wave characteristics in surge tanks, which is of great significance for safe operation. Firstly, the mathematic model of UDSTS system coupled with turbine-governor-penstock (TGP) system is established. Then, the analytical formulas for the frequencies of surge waves are derived, and their rationality is verified as well. The generation mechanism and influencing factors of surge waves are investigated. Finally, the guiding suggestions for actual design are proposed. The results indicate that the formulas have great accuracy. The surge waves in double surge tanks are the superposition of two subwaves (i.e. fundamental wave and interharmonic). The fundamental wave is mainly affected by the long headrace tunnel, cross-sectional areas of both surge tanks. The dominant factors of the interharmonic are the short headrace tunnel length, the cross-sectional area of the surge tank near the turbine. The proposed conclusions for surge wave characteristics can provide theoretical reference for practical applications.

Suggested Citation

  • Liu, Yi & Zhang, Jian & Liu, Zhe & Chen, Long & Yu, Xiaodong, 2022. "Surge wave characteristics for hydropower plant with upstream double surge tanks connected in series under small load disturbance," Renewable Energy, Elsevier, vol. 186(C), pages 667-676.
  • Handle: RePEc:eee:renene:v:186:y:2022:i:c:p:667-676
    DOI: 10.1016/j.renene.2022.01.004
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    References listed on IDEAS

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    Cited by:

    1. Wang, Le & Guo, Wencheng, 2022. "Nonlinear hydraulic coupling characteristics and energy conversion mechanism of pipeline - surge tank system of hydropower station with super long headrace tunnel," Renewable Energy, Elsevier, vol. 199(C), pages 1345-1360.
    2. Zhang, Jian & Qiu, Weixin & Wang, Qinyi & Yao, Tianyu & Hu, Chao & Liu, Yi, 2024. "Extreme water level of surge chamber in hydropower plant under combined operating conditions," Chaos, Solitons & Fractals, Elsevier, vol. 178(C).
    3. Liu, Yi & Zhang, Jian & Chen, Sheng & Yu, Xiaodong, 2023. "Stability analysis and estimation of domain of attraction for hydropower station with surge tank," Chaos, Solitons & Fractals, Elsevier, vol. 170(C).
    4. Yi Liu & Xiaodong Yu & Xinlei Guo & Wenlong Zhao & Sheng Chen, 2023. "Operational Stability of Hydropower Plant with Upstream and Downstream Surge Chambers during Small Load Disturbance," Energies, MDPI, vol. 16(11), pages 1-13, June.

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