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Numerical Analysis of the Transient Behaviour of a Variable Speed Pump-Turbine during a Pumping Power Reduction Scenario

Author

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  • Giorgio Pavesi

    (Department of Industrial Engineering, University of Padova, 35131 Padova, Italy)

  • Giovanna Cavazzini

    (Department of Industrial Engineering, University of Padova, 35131 Padova, Italy)

  • Guido Ardizzon

    (Department of Industrial Engineering, University of Padova, 35131 Padova, Italy)

Abstract

To achieve the carbon free electricity generation target for 2050, the penetration of renewable energy sources should further increase. To address the impacts of their unpredictable and intermittent characteristics on the future electricity grid, Pumped Hydro Energy Storage (PHES) plants should enhance their regulation capability by extending their continuous operating range far beyond the optimal normal working range. However, for the time being, the regulation capability of the new generation of PHES, equipped with reversible pump-turbines due to their cost-effectiveness, is limited at part load by instability problems. The aim of this paper is to analyse, during a pumping power reduction scenario, the onset and development of unsteady phenomena leading to unstable behaviour. A 3D transient numerical simulation was carried out on the first stage of a variable-speed two-stage pump-turbine from full load to the unstable operating zone by progressively reducing the speed from 100% to 88% rpm corresponding to a power reduction from full load to about 60% with a ramp rate of 1.5% per s. Two three-dimensional unsteady flow structures affecting the return channel and the wicket gates at the end of the first stage were identified and their evolution in the power regulation scenario was fluid-dynamically and spectrally characterized to determine the fluid-dynamical conditions causing the head drop in the hump zone.

Suggested Citation

  • Giorgio Pavesi & Giovanna Cavazzini & Guido Ardizzon, 2016. "Numerical Analysis of the Transient Behaviour of a Variable Speed Pump-Turbine during a Pumping Power Reduction Scenario," Energies, MDPI, vol. 9(7), pages 1-15, July.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:7:p:534-:d:73809
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    References listed on IDEAS

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    1. Steffen, Bjarne, 2012. "Prospects for pumped-hydro storage in Germany," Energy Policy, Elsevier, vol. 45(C), pages 420-429.
    2. Anagnostopoulos, John S. & Papantonis, Dimitris E., 2012. "Study of pumped storage schemes to support high RES penetration in the electric power system of Greece," Energy, Elsevier, vol. 45(1), pages 416-423.
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    Cited by:

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    2. Lei Zhang & Liang Zhang & Qian Zhang & Kuan Jiang & Yuan Tie & Songling Wang, 2018. "Effects of the Second-Stage of Rotor with Single Abnormal Blade Angle on Rotating Stall of a Two-Stage Variable Pitch Axial Fan," Energies, MDPI, vol. 11(12), pages 1-18, November.
    3. Chang-Gi Min & Mun-Kyeom Kim, 2017. "Flexibility-Based Reserve Scheduling of Pumped Hydroelectric Energy Storage in Korea," Energies, MDPI, vol. 10(10), pages 1-13, September.
    4. Li, Deyou & Fu, Xiaolong & Zuo, Zhigang & Wang, Hongjie & Li, Zhenggui & Liu, Shuhong & Wei, Xianzhu, 2019. "Investigation methods for analysis of transient phenomena concerning design and operation of hydraulic-machine systems—A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 101(C), pages 26-46.
    5. Martínez-Lucas, Guillermo & Pérez-Díaz, Juan I. & Chazarra, Manuel & Sarasúa, José I. & Cavazzini, Giovanna & Pavesi, Giorgio & Ardizzon, Guido, 2019. "Risk of penstock fatigue in pumped-storage power plants operating with variable speed in pumping mode," Renewable Energy, Elsevier, vol. 133(C), pages 636-646.
    6. Wilson Cesar Sant’Ana & Robson Bauwelz Gonzatti & Germano Lambert-Torres & Erik Leandro Bonaldi & Bruno Silva Torres & Pedro Andrade de Oliveira & Rondineli Rodrigues Pereira & Luiz Eduardo Borges-da-, 2019. "Development and 24 Hour Behavior Analysis of a Peak-Shaving Equipment with Battery Storage," Energies, MDPI, vol. 12(11), pages 1-22, May.
    7. Jianzhong Zhou & Yanhe Xu & Yang Zheng & Yuncheng Zhang, 2017. "Optimization of Guide Vane Closing Schemes of Pumped Storage Hydro Unit Using an Enhanced Multi-Objective Gravitational Search Algorithm," Energies, MDPI, vol. 10(7), pages 1-23, July.
    8. Huixiang Chen & Daqing Zhou & Yuan Zheng & Shengwen Jiang & An Yu & You Guo, 2018. "Load Rejection Transient Process Simulation of a Kaplan Turbine Model by Co-Adjusting Guide Vanes and Runner Blades," Energies, MDPI, vol. 11(12), pages 1-18, November.

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