A 1D-3D Coupling Model to Evaluate Hydropower Generation System Stability

Meng Zhang, Jinhai Feng, Ziwen Zhao, Wei Zhang (), Junzhi Zhang and Beibei Xu
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Meng Zhang: State Grid Gansu Liujiaxia Hydropower Plant, Yongjing 731600, China
Jinhai Feng: Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Xianyang 712100, China
Ziwen Zhao: Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Xianyang 712100, China
Wei Zhang: State Grid Gansu Liujiaxia Hydropower Plant, Yongjing 731600, China
Junzhi Zhang: Northwest Engineering Corporation Limited, Xi’an 710000, China
Beibei Xu: Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Xianyang 712100, China

Energies, 2022, vol. 15, issue 19, 1-13

Abstract: This paper proposes a novel 1D-3D approach for the stability characteristics of the hydropower generation system (HGS) in transition processes. First, a 1D-3D coupling model was established for the HGS in the load-reduction process. Second, a sensitivity analysis of the HGS’s parameters to the rotation speed and discharge was conducted. Third, the pressure pulsation characteristics of the HGS with three typical guide vane openings were analyzed during the load-reduction process. The results show that with the closure of the guide vane, the discharge gradually decreases and it is sensitive to the change in hydraulic parameters. The rotation speed fluctuates at the early stage of the transition process and is easily affected by mechanical parameters. In addition, the pressure pulsation inside the Francis turbine is more intense under small openings than large openings, and the primary frequency of pressure pulsation under three opening degrees is the blade frequency. The 1D-3D coupling model successfully integrates the advantages of traditional methods and provides a reference for predicting system stability and exploring the stability mechanism.

Keywords: 1D–3D coupling model; transition stability; sensitivity analysis; pressure pulsation; hydro power (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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