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Influence of Flexible Generation Mode on the Stability of Hydropower Generation System: Stability Assessment of Part-Load Operation

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  • Gongcheng Liu

    (Institute of Water Resource and Hydropower Research, Northwest A&F University, Yangling, Xianyang 712100, China
    Key Laboratory of Agriculture Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Xianyang 712100, China)

  • Xudi Qiu

    (Institute of Water Resource and Hydropower Research, Northwest A&F University, Yangling, Xianyang 712100, China)

  • Jiayi Ma

    (Institute of Water Resource and Hydropower Research, Northwest A&F University, Yangling, Xianyang 712100, China)

  • Diyi Chen

    (Institute of Water Resource and Hydropower Research, Northwest A&F University, Yangling, Xianyang 712100, China
    Key Laboratory of Agriculture Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Xianyang 712100, China)

  • Xiao Liang

    (Institute of Water Resource and Hydropower Research, Northwest A&F University, Yangling, Xianyang 712100, China
    Key Laboratory of Agriculture Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Xianyang 712100, China)

Abstract

Utilizing the flexibility of hydropower to integrate more intermittent renewable energy into the power grid requires hydro units to expand the operating range; this duty, however, requires a continuous improvement of their stability during part-load conditions. This study focuses on the stability performance of hydropower generation systems (HGS) during flexible operation. First, a dynamic model of HGS that reflects the characteristics of part-load conditions is established by introducing pressure pulsation in the draft tube. Second, the model of HGS is coupled with a shafting system to investigate the vibration property of the unit. Then, the validity of the coupling model is verified by comparing it with a traditional model and actual data. Finally, some possible ways to mitigate the instability caused by part-load operation are explored. The results show that part-load operation of the system is accompanied by significant dynamic response fluctuations (5%). Moreover, the interaction effect of multiple vibration sources and the vibration performance in a part-load condition are investigated. This paper is expected to provide support for improving the stability of HGS part-load operation and offer useful insights for exploiting the flexibility potential of HGS.

Suggested Citation

  • Gongcheng Liu & Xudi Qiu & Jiayi Ma & Diyi Chen & Xiao Liang, 2022. "Influence of Flexible Generation Mode on the Stability of Hydropower Generation System: Stability Assessment of Part-Load Operation," Energies, MDPI, vol. 15(11), pages 1-19, May.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:11:p:3956-:d:825509
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    References listed on IDEAS

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    Cited by:

    1. Xiaokun Man & Hongyan Song & Huanhuan Li, 2023. "Estimating Hydropower Generation Flexibilities of a Hybrid Hydro–Wind Power System: From the Perspective of Multi-Time Scales," Energies, MDPI, vol. 16(13), pages 1-17, July.

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