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Analysis of the Power Fluctuations Caused by the Unstable Flow in the Trifurcation of Multi-Turbine Diversion Systems with Common Penstock in Hydropower Units

Author

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  • Xinran Guo

    (The Laboratory of Transients in Hydraulic Machinery, Wuhan University, Wuhan 430072, China
    School of Power and Mechanical Engineering; Wuhan University, Wuhan 430072, China)

  • Huaiyu Cheng

    (School of Power and Mechanical Engineering; Wuhan University, Wuhan 430072, China)

  • Hao Wang

    (China National Electric Engineering Company, Beijing 100048, China)

  • Yuanchu Cheng

    (The Laboratory of Transients in Hydraulic Machinery, Wuhan University, Wuhan 430072, China
    School of Power and Mechanical Engineering; Wuhan University, Wuhan 430072, China)

  • Mian Sun

    (China National Electric Engineering Company, Beijing 100048, China)

Abstract

Stable operation is a challenge for hydropower stations with multi-turbine hydraulic coupled division systems with a common penstock. In this paper, the serious power fluctuations in a power station with such a division system are analyzed. The fluctuations occur in many conditions without any movement of the regulating system. The mathematical analysis illustrates that pressure fluctuation is responsible for power fluctuations. The computational fluid dynamics (CFD) method provided by ANSYS is used to study the flow pattern in penstocks. The vortex caused by the irrational structure of trifurcation is the reason for pressure fluctuations. Several methods are proposed to optimize the flow stability and three cases are simulated based on these measures. The calculation results of three cases prove the effectiveness of these measures. The measure of setting the new guide plate is finally conducted, and the output power fluctuations vanish. The flow calculation plays a role in the analysis and optimization of the hydraulic system of the hydropower unit. Some rules are summarized from the cases and are helpful in the design of trifurcation in a division system with a common penstock.

Suggested Citation

  • Xinran Guo & Huaiyu Cheng & Hao Wang & Yuanchu Cheng & Mian Sun, 2019. "Analysis of the Power Fluctuations Caused by the Unstable Flow in the Trifurcation of Multi-Turbine Diversion Systems with Common Penstock in Hydropower Units," Energies, MDPI, vol. 12(15), pages 1-17, July.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:15:p:2941-:d:253298
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    References listed on IDEAS

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    1. Catherine Mitchell, 2016. "Momentum is increasing towards a flexible electricity system based on renewables," Nature Energy, Nature, vol. 1(2), pages 1-6, February.
    2. Wencheng Guo & Daoyi Zhu, 2018. "A Review of the Transient Process and Control for a Hydropower Station with a Super Long Headrace Tunnel," Energies, MDPI, vol. 11(11), pages 1-27, November.
    3. Weijia Yang & Per Norrlund & Linn Saarinen & Adam Witt & Brennan Smith & Jiandong Yang & Urban Lundin, 2018. "Burden on hydropower units for short-term balancing of renewable power systems," Nature Communications, Nature, vol. 9(1), pages 1-12, December.
    4. Chang, XiaoLin & Liu, Xinghong & Zhou, Wei, 2010. "Hydropower in China at present and its further development," Energy, Elsevier, vol. 35(11), pages 4400-4406.
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    Cited by:

    1. Xinran Guo & Yuanchu Cheng & Jiada Wei & Yitian Luo, 2021. "Stability Analysis of Different Regulation Modes of Hydropower Units," Energies, MDPI, vol. 14(7), pages 1-19, March.

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