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Small Hydropower Plants with Variable Speed Operation—An Optimal Operation Curve Determination

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  • Dariusz Borkowski

    (Institute of Electromechanical Energy Conversion, Cracow University of Technology, 31-155 Krakow, Poland)

  • Marek Majdak

    (Department of Energy, Cracow University of Technology, 31-155 Krakow, Poland)

Abstract

In recent times, much attention has been paid to small hydropower plants (SHPs) with variable speed operation and different control techniques. Control complexity in SHPs is mainly caused by specific steady-state features of the water turbine, the long time constants of the hydraulic system and significant seasonal and/or aging-related deterioration in the system performance. This paper presents the most important features of the turbine model from a control point of view. It classifies control techniques for SHPs with variable speed operation in terms of the turbine type and SHP function (run-of-the-river and reservoir). Furthermore, various control methods are analysed taking into account the complexity of the method, dynamics, adaptability and applicability. The novelty of this study is the proposal of a simple, universal analytical formula, which, based on the basic dimensions of the turbine, determines the optimal operating curve. The proposed formula is verified on a real SHP 150 kW by comparison with measurements in the form of operational characteristics. The analysis of the annual energy production confirms the effectiveness of the approximation precision, yielding only 1% production losses, and shows an advantage of variable speed over constant speed in annual energy production of 16%.

Suggested Citation

  • Dariusz Borkowski & Marek Majdak, 2020. "Small Hydropower Plants with Variable Speed Operation—An Optimal Operation Curve Determination," Energies, MDPI, vol. 13(23), pages 1-20, November.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:23:p:6230-:d:451610
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    References listed on IDEAS

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    2. Alizadeh Bidgoli, Mohsen & Yang, Weijia & Ahmadian, Ali, 2020. "DFIM versus synchronous machine for variable speed pumped storage hydropower plants: A comparative evaluation of technical performance," Renewable Energy, Elsevier, vol. 159(C), pages 72-86.
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    5. Yang, Weijia & Yang, Jiandong, 2019. "Advantage of variable-speed pumped storage plants for mitigating wind power variations: Integrated modelling and performance assessment," Applied Energy, Elsevier, vol. 237(C), pages 720-732.
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    Cited by:

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    2. Bartosz Rozegnał & Paweł Albrechtowicz & Piotr Cisek, 2021. "A Novel Low Voltage Selective Circuit Breaker with Additional Current Path," Energies, MDPI, vol. 14(23), pages 1-14, December.
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    4. Wenbin Su & Hongbo Wei & Penghua Guo & Qiao Hu & Mengyuan Guo & Yuanjie Zhou & Dayu Zhang & Zhufeng Lei & Chaohui Wang, 2021. "Research on Hydraulic Conversion Technology of Small Ocean Current Turbines for Low-Flow Current Energy Generation," Energies, MDPI, vol. 14(20), pages 1-19, October.
    5. Damian Liszka & Zbigniew Krzemianowski & Tomasz Węgiel & Dariusz Borkowski & Andrzej Polniak & Konrad Wawrzykowski & Artur Cebula, 2022. "Alternative Solutions for Small Hydropower Plants," Energies, MDPI, vol. 15(4), pages 1-31, February.
    6. Eva Bílková & Jiří Souček & Martin Kantor & Roman Kubíček & Petr Nowak, 2023. "Variable-Speed Propeller Turbine for Small Hydropower Applications," Energies, MDPI, vol. 16(9), pages 1-14, April.
    7. Tapia, A. & R. del Nozal, A. & Reina, D.G. & Millán, P., 2021. "Three-dimensional optimization of penstock layouts for micro-hydropower plants using genetic algorithms," Applied Energy, Elsevier, vol. 301(C).

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