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Modeling and stability investigation on the governor-turbine-hydraulic system with a ceiling-sloping tail tunnel

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  • Zhou, Jianxu
  • Mao, Yutong
  • Shen, Aili
  • Zhang, Jian

Abstract

For a hydropower system with a relatively short tail tunnel and wide variation of tail water level, the ceiling-sloping tail tunnel (CSTT) is often recommended. Considering various flow patterns and traveling free-surface-pressurized interface in the CSTT, stability modeling and analysis of the governor-turbine-hydraulic system shows more challenging. Based on state equations analysis, an improved nonlinear model considering transition part, and a new linear model for downstream free-surface flow are derived. Further comparative analysis indicates that, by introducing these models, water flow characteristics in transition part have positive effect on operation stability with an around 4.0% increase of attenuation rate, while that of downstream free-surface flow has a negative effect with a 21.8% decrease rate on the absolute value of negative attenuation factor. For stability optimization of the CSTT, to properly increase its bottom width is preferable, herein with a 6.2% increase of attenuation rate for a 2.0 m increase of bottom width, while a reasonable ceiling slope should be optimized considering the counteraction effect of upstream pressurized flow and downstream free-surface flow. The new developed models and further discussion for the hydropower systems with a CSTT will greatly improve system's stability evaluation and advance the development of renewable energy.

Suggested Citation

  • Zhou, Jianxu & Mao, Yutong & Shen, Aili & Zhang, Jian, 2023. "Modeling and stability investigation on the governor-turbine-hydraulic system with a ceiling-sloping tail tunnel," Renewable Energy, Elsevier, vol. 204(C), pages 812-822.
    • Handle: RePEc:eee:renene:v:204:y:2023:i:c:p:812-822
    DOI: 10.1016/j.renene.2023.01.053
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    References listed on IDEAS

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    1. Jianxu Zhou & Chaoqun Li & Yutong Mao, 2023. "Discussion on Operational Stability of Governor Turbine Hydraulic System Considering Effect of Power System," Energies, MDPI, vol. 16(11), pages 1-17, May.

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