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Extension of Operating Range in Pump-Turbines. Influence of Head and Load

Author

Listed:
  • Carme Valero

    (Center for Industrial Diagnostics and Fluid Dynamics (CDIF), Polytechnic University of Catalonia (UPC), Av. Diagonal, 647, ETSEIB, 08028 Barcelona, Spain)

  • Mònica Egusquiza

    (Center for Industrial Diagnostics and Fluid Dynamics (CDIF), Polytechnic University of Catalonia (UPC), Av. Diagonal, 647, ETSEIB, 08028 Barcelona, Spain)

  • Eduard Egusquiza

    (Center for Industrial Diagnostics and Fluid Dynamics (CDIF), Polytechnic University of Catalonia (UPC), Av. Diagonal, 647, ETSEIB, 08028 Barcelona, Spain)

  • Alexandre Presas

    (Center for Industrial Diagnostics and Fluid Dynamics (CDIF), Polytechnic University of Catalonia (UPC), Av. Diagonal, 647, ETSEIB, 08028 Barcelona, Spain)

  • David Valentin

    (Center for Industrial Diagnostics and Fluid Dynamics (CDIF), Polytechnic University of Catalonia (UPC), Av. Diagonal, 647, ETSEIB, 08028 Barcelona, Spain)

  • Matias Bossio

    (Center for Industrial Diagnostics and Fluid Dynamics (CDIF), Polytechnic University of Catalonia (UPC), Av. Diagonal, 647, ETSEIB, 08028 Barcelona, Spain)

Abstract

Due to the increasing share of new renewable energies like wind and solar in the generation of electricity the need for power regulation and energy storage is becoming of paramount importance. One of the systems to store huge amounts of energy is pumped storage using reversible hydropower units. The machines used in these power plants are pump-turbines, which can operate as a pump and as a turbine. The surplus of electrical energy during low consumption hours can be converted into potential hydraulic energy by pumping water to a higher level. The stored energy can be converted into electricity again by operating the runner as a turbine. Due to new regulation requirements machines have to extend the operating range in order to match energy generation with consumption for the grid stability. In this paper the consequences of extending the operating range in existing pump-turbines have been studied. For that purpose, the data obtained after two years of condition monitoring were analyzed. Vibrations and pressure fluctuations of two pump-turbines of 85 MW each have been studied during pump and turbine operation. For turbine operation the effects of extending the operating range from the standard range of 45–85 MW to and increased range of 20–85 MW were analyzed. The change in vibration levels and signatures at very low load are presented with the identification of the phenomena that occur under these conditions. The influence of head in the vibration behavior is also presented. The appearance of fluid instabilities generated at part load that may produce power swing is also presented. Finally, the effect of head on the vibration levels for pump operation is shown and analyzed.

Suggested Citation

  • Carme Valero & Mònica Egusquiza & Eduard Egusquiza & Alexandre Presas & David Valentin & Matias Bossio, 2017. "Extension of Operating Range in Pump-Turbines. Influence of Head and Load," Energies, MDPI, vol. 10(12), pages 1-17, December.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:12:p:2178-:d:123561
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    Citations

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    Cited by:

    1. Buchao Xu & Weiqiang Zhao & Wenhua Lin & Zhongyu Mao & Ran Tao & Zhengwei Wang, 2022. "The Influence of Different Operating Conditions on the Support Bracket Stress in Pumped Storage Units," Energies, MDPI, vol. 15(6), pages 1-15, March.
    2. Kougias, Ioannis & Aggidis, George & Avellan, François & Deniz, Sabri & Lundin, Urban & Moro, Alberto & Muntean, Sebastian & Novara, Daniele & Pérez-Díaz, Juan Ignacio & Quaranta, Emanuele & Schild, P, 2019. "Analysis of emerging technologies in the hydropower sector," Renewable and Sustainable Energy Reviews, Elsevier, vol. 113(C), pages 1-1.
    3. Valentín, David & Presas, Alexandre & Valero, Carme & Egusquiza, Mònica & Egusquiza, Eduard, 2020. "Synchronous condenser operation in Francis turbines: Effects in the runner stress and machine vibration," Renewable Energy, Elsevier, vol. 146(C), pages 890-900.
    4. Valentín, David & Presas, Alexandre & Valero, Carme & Egusquiza, Mònica & Egusquiza, Eduard & Gomes, Joao & Avellan, François, 2020. "Transposition of the mechanical behavior from model to prototype of Francis turbines," Renewable Energy, Elsevier, vol. 152(C), pages 1011-1023.
    5. Ming Zhang & David Valentin & Carme Valero & Mònica Egusquiza & Weiqiang Zhao, 2018. "Numerical Study on the Dynamic Behavior of a Francis Turbine Runner Model with a Crack," Energies, MDPI, vol. 11(7), pages 1-18, June.
    6. Małgorzata Jastrzębska, 2022. "Installation’s Conception in the Field of Renewable Energy Sources for the Needs of the Silesian Botanical Garden," Energies, MDPI, vol. 15(18), pages 1-28, September.

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