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Transient analysis of a multi-unit pumped storage system during load rejection process

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  • Zhang, Hao
  • Guo, Pengcheng
  • Sun, Longgang

Abstract

Pumped storage systems are attractive for power generation and storage with the development of clean energy. The combined operating mode of wind energy, solar energy and pumped storage systems is an emerging form of energy production, which brings pumped storage systems challenge in transient operation. Here we innovatively present a transient model of a multi-unit pumped storage system by coupling hydraulic system with unit system. We demonstrate that the proposed model can reflect the coupling effect of units during transient process. The simulation is provided with one unit shutdown under three kinds of closing laws and another unit controlled by PID controller at rated condition. The dynamic responses of unit-1 head are negatively related with its flow and output. The fluctuation of the unit-2 head is always higher than that of unit-1, and their fluctuation periods are similar. Analysis of dynamic characteristics of the pumped storage system suggest that transient performance improvement can be achieved by changing the motion law of guide vanes. The influence of guide vanes on the transient performance of the pumped storage system is investigated during load rejection process and the results could enable the flexible operation of multi-unit pumped storage systems for renewable power generation.

Suggested Citation

  • Zhang, Hao & Guo, Pengcheng & Sun, Longgang, 2020. "Transient analysis of a multi-unit pumped storage system during load rejection process," Renewable Energy, Elsevier, vol. 152(C), pages 34-43.
    • Handle: RePEc:eee:renene:v:152:y:2020:i:c:p:34-43
    DOI: 10.1016/j.renene.2019.12.111
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    Cited by:

    1. 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.
    2. 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.
    3. Lan, Xinyao & Jin, Jiahui & Xu, Beibei & Chen, Diyi & Egusquiza, Mònica & Kim, Jin-Hyuk & Egusquiza, Eduard & Jafar, Nejadali & Xu, Lin & Kuang, Yuan, 2022. "Physical model test and parametric optimization of a hydroelectric generating system with a coaxial shaft surge tank," Renewable Energy, Elsevier, vol. 200(C), pages 880-899.
    4. Cui, Zilong & Guo, Wencheng, 2023. "Multi-objective control of transient process of hydropower plant with two turbines sharing one penstock under combined operating conditions," Renewable Energy, Elsevier, vol. 206(C), pages 1275-1288.

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