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Hydraulic Oscillation Analysis of the Hydropower Station with an Equivalent Circuit-Based Hydraulic Impedance Scheme

Author

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  • Shuangqing Yan

    (Department of Information and Technology, Shanghai Pudong Development Bank, Wuhan 430030, China)

  • Yang Zheng

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

  • Jinbao Chen

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

  • Yousong Shi

    (School of Civil and Hydraulic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)

Abstract

The concept of hydraulic impedance is widely used for periodic or oscillating flow scenarios in applied hydraulic transients. This paper proposes an equivalent circuit-based discrete hydraulic impedance model for the hydraulic system of the power station. The equivalent hydraulic circuit is established by an analogy between the water hammer wave propagation in pressurized pipes and the electromagnetic wave propagation in conductors. The discrete hydraulic impedance at a given location is obtained by calculating the total specific impedance of the series and parallel circuits from one end to the other. In addition, the numerical solution process to obtain the natural frequencies of the system via the proposed model is designed in detail. Furthermore, oscillation characteristics of the pipelines in the hydropower station are investigated. The variation trends of the decay coefficients of different orders of oscillation of the system and the influence of turbine impedance on the oscillation frequencies are discussed, respectively.

Suggested Citation

  • Shuangqing Yan & Yang Zheng & Jinbao Chen & Yousong Shi, 2022. "Hydraulic Oscillation Analysis of the Hydropower Station with an Equivalent Circuit-Based Hydraulic Impedance Scheme," Sustainability, MDPI, vol. 14(18), pages 1-16, September.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:18:p:11410-:d:912537
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    References listed on IDEAS

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    4. Lu, Xueding & Li, Chaoshun & Liu, Dong & Zhu, Zhiwei & Tan, Xiaoqiang, 2022. "Influence of water diversion system topologies and operation scenarios on the damping characteristics of hydropower units under ultra-low frequency oscillations," Energy, Elsevier, vol. 239(PE).
    5. Gang Chen & Chang Liu & Chengwei Fan & Xiaoyan Han & Huabo Shi & Guanhong Wang & Dongping Ai, 2020. "Research on Damping Control Index of Ultra-Low-Frequency Oscillation in Hydro-Dominant Power Systems," Sustainability, MDPI, vol. 12(18), pages 1-13, September.
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    Cited by:

    1. Lu, Xueding & Li, Chaoshun & Liu, Dong & Wang, He & Zhu, Zhiwei & Ta, Xiaoqiang & Xu, Rongli, 2024. "Correlating analysis and optimization between hydropower system parameters and multi-frequency oscillation characteristics," Energy, Elsevier, vol. 304(C).

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