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The interaction effect of hydraulic transient conditions of two parallel pump-turbine units in a pumped-storage power plant with considering “S-shaped” instability region: Numerical simulation

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  • Rezghi, Ali
  • Riasi, Alireza

Abstract

In this paper the interaction effect of hydraulic transient flow for two parallel pump-turbine units which are installed on the same penstock, has been numerically investigated. Siah Bishe pumped storage power plant located at the north of Iran, has been considered as the case study. At First, simultaneous emergency shutdown of two units is simulated. Then the state in which the load of unit 1 is rejected while the unit 2 operates normally, has been studied. For this purpose, the governing equations of transient flow in waterways are solved by using the method of characteristics. Since for the same unit speed in “S-shaped” region of pump-turbine characteristic curves, three different values for unit discharge and unit torque are available, the characteristic curves are implemented in the code as the polar form by using modified Suter transformations. Results show that in the case of two units’ emergency shutdown, spiral case pressure rise and draft tube pressure reduction, increase by 6.9% and 54.4% in comparison with the one unit emergency shutdown. In the second case, the maximum pressure in the spiral cases and the minimum pressure in the draft tubes decrease by 1.2% and 6.4% respectively. In the recent case, the speed-control governor of unit 2 improves the transient state of the whole system by the wicket gates adjusting.

Suggested Citation

  • Rezghi, Ali & Riasi, Alireza, 2018. "The interaction effect of hydraulic transient conditions of two parallel pump-turbine units in a pumped-storage power plant with considering “S-shaped” instability region: Numerical simulation," Renewable Energy, Elsevier, vol. 118(C), pages 896-908.
    • Handle: RePEc:eee:renene:v:118:y:2018:i:c:p:896-908
    DOI: 10.1016/j.renene.2017.11.067
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    References listed on IDEAS

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    1. Zeng, Wei & Yang, Jiandong & Tang, Renbo & Yang, Weijia, 2016. "Extreme water-hammer pressure during one-after-another load shedding in pumped-storage stations," Renewable Energy, Elsevier, vol. 99(C), pages 35-44.
    2. Rezghi, A. & Riasi, A., 2016. "Sensitivity analysis of transient flow of two parallel pump-turbines operating at runaway," Renewable Energy, Elsevier, vol. 86(C), pages 611-622.
    3. Zuo, Zhigang & Fan, Honggang & Liu, Shuhong & Wu, Yulin, 2016. "S-shaped characteristics on the performance curves of pump-turbines in turbine mode – A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 60(C), pages 836-851.
    4. Martínez-Lucas, Guillermo & Sarasúa, José Ignacio & Sánchez-Fernández, José Ángel & Wilhelmi, José Román, 2016. "Frequency control support of a wind-solar isolated system by a hydropower plant with long tail-race tunnel," Renewable Energy, Elsevier, vol. 90(C), pages 362-376.
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    Cited by:

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    2. Hu, Jinhong & Yang, Jiebin & Zeng, Wei & Zhao, Zhigao & Yang, Jiandong, 2021. "Hydraulic interaction of two parallel pump-turbines in constant-speed oscillation: Measurement, simulation, and sensitivity analysis," Renewable Energy, Elsevier, vol. 176(C), pages 269-279.
    3. Cavazzini, Giovanna & Houdeline, Jean-Bernard & Pavesi, Giorgio & Teller, Olivier & Ardizzon, Guido, 2018. "Unstable behaviour of pump-turbines and its effects on power regulation capacity of pumped-hydro energy storage plants," Renewable and Sustainable Energy Reviews, Elsevier, vol. 94(C), pages 399-409.
    4. Ge Zhao & Wei Li & Jinsong Zhu, 2019. "A Numerical Investigation of the Influence of Geometric Parameters on the Performance of a Multi-Channel Confluent Water Supply," Energies, MDPI, vol. 12(22), pages 1-21, November.
    5. Xu, Beibei & Luo, Xingqi & Egusquiza, Mònica & Ye, Wei & Liu, Jing & Egusquiza, Eduard & Chen, Diyi & Guo, Pengcheng, 2021. "Nonlinear modal interaction analysis and vibration characteristics of a francis hydro-turbine generator unit," Renewable Energy, Elsevier, vol. 168(C), pages 854-864.
    6. Shengli Liao & Hongye Zhao & Gang Li & Benxi Liu, 2019. "Short-Term Load Dispatching Method for a Diversion Hydropower Plant with Multiple Turbines in One Tunnel Using a Two-Stage Model," Energies, MDPI, vol. 12(8), pages 1-18, April.
    7. Sheng Chen & Jian Zhang & Gaohui Li & Xiaodong Yu, 2019. "Influence Mechanism of Geometric Characteristics of Water Conveyance System on Extreme Water Hammer during Load Rejection in Pumped Storage Plants," Energies, MDPI, vol. 12(15), pages 1-22, July.
    8. 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.
    9. Lei Zhang & Jian Zhang & Xiaodong Yu & Jiawen Lv & Xiaoying Zhang, 2019. "Transient Simulation for a Pumped Storage Power Plant Considering Pressure Pulsation Based on Field Test," Energies, MDPI, vol. 12(13), pages 1-16, June.
    10. Yonggang Li & Jinjiao Hou & Juan Gu & Chaoshun Li & Yanhe Xu, 2022. "Dynamic Characteristics and Successive Start-Up Control Strategy Optimization of Pumped Storage Units under Low-Head Extreme Conditions," Energies, MDPI, vol. 15(15), pages 1-19, July.

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