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Impact of Dual Variable Speed and Inlet Valve Control on the Efficiency and Operating Range of Low-Head Contra-Rotating Pump-Turbines

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Titel: Impact of Dual Variable Speed and Inlet Valve Control on the Efficiency and Operating Range of Low-Head Contra-Rotating Pump-Turbines
Autoren: Truijen, Daan, Hoffstaedt, Justus, Fahlbeck, Jonathan, 1992, Laguna, Antonio, Nilsson, Håkan, 1971, Stockman, Kurt, Kooning, Jeroen De
Quelle: Augmenting grid stability through Low-head Pumped Hydro Energy Utilization & Storage (ALPHEUS) IEEE Access. 12:86854-86868
Schlagwörter: Energy efficiency, Computational modeling, Hydroelectric power generation, Numerical models, Turbines, Mathematical models, Hydropower storage, MIMO system, Rotors, dual rotor pump-turbine, energy efficiency, cycle efficiency, Pumps, MIMO communication
Beschreibung: In an effort to make pumped hydropower storage (PHS) technology feasible for regions with a flat topography, recent research shows promising results using a contra-rotating reversible pump-turbine at low-head. In this study, the impact of dual variable speed and inlet valve control is analyzed to evaluate the effect of these three degrees of freedom (DOFs) on the system efficiency and operating range. To this end, analytical models are described to assess pump-turbine performance, conduit losses and electromechanical losses. Methodologically, optimal efficiency maps are computed for every combination of the three DOFs to evaluate individual and combined effects on the overall efficiency. Furthermore, three energy storage cycles are analyzed to further study the performance in realistic use-cases. Key conclusions include an increase in round-trip efficiency by combining variable speed ratio and inlet valve control of 5.6% and 2.0% compared with only variable speed ratio control and variable inlet valve control, respectively. Furthermore, it is shown that using only 1 DOF significantly limits the operating range, with the addition of a variable inlet valve granting a higher impact than a variable speed ratio. Combining inlet valve and speed ratio control leads not only to the highest efficiency, but also the largest operating range, with a maximum round-trip efficiency of 67.5% and an energy storage capacity of 58.6 Wh/m2. The results confirm that exploiting both dual variable speed operation and inlet valve control yields the maximum efficiency and operating range, and is thus the preferred topology for contra-rotating reversible pump-turbines in low-head operation.
Dateibeschreibung: electronic
Zugangs-URL: https://research.chalmers.se/publication/541698
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  Data: Impact of Dual Variable Speed and Inlet Valve Control on the Efficiency and Operating Range of Low-Head Contra-Rotating Pump-Turbines
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  Data: <searchLink fieldCode="AR" term="%22Truijen%2C+Daan%22">Truijen, Daan</searchLink><br /><searchLink fieldCode="AR" term="%22Hoffstaedt%2C+Justus%22">Hoffstaedt, Justus</searchLink><br /><searchLink fieldCode="AR" term="%22Fahlbeck%2C+Jonathan%22">Fahlbeck, Jonathan</searchLink>, 1992<br /><searchLink fieldCode="AR" term="%22Laguna%2C+Antonio%22">Laguna, Antonio</searchLink><br /><searchLink fieldCode="AR" term="%22Nilsson%2C+Håkan%22">Nilsson, Håkan</searchLink>, 1971<br /><searchLink fieldCode="AR" term="%22Stockman%2C+Kurt%22">Stockman, Kurt</searchLink><br /><searchLink fieldCode="AR" term="%22Kooning%2C+Jeroen+De%22">Kooning, Jeroen De</searchLink>
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  Data: <i>Augmenting grid stability through Low-head Pumped Hydro Energy Utilization & Storage (ALPHEUS) IEEE Access</i>. 12:86854-86868
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  Data: <searchLink fieldCode="DE" term="%22Energy+efficiency%22">Energy efficiency</searchLink><br /><searchLink fieldCode="DE" term="%22Computational+modeling%22">Computational modeling</searchLink><br /><searchLink fieldCode="DE" term="%22Hydroelectric+power+generation%22">Hydroelectric power generation</searchLink><br /><searchLink fieldCode="DE" term="%22Numerical+models%22">Numerical models</searchLink><br /><searchLink fieldCode="DE" term="%22Turbines%22">Turbines</searchLink><br /><searchLink fieldCode="DE" term="%22Mathematical+models%22">Mathematical models</searchLink><br /><searchLink fieldCode="DE" term="%22Hydropower+storage%22">Hydropower storage</searchLink><br /><searchLink fieldCode="DE" term="%22MIMO+system%22">MIMO system</searchLink><br /><searchLink fieldCode="DE" term="%22Rotors%22">Rotors</searchLink><br /><searchLink fieldCode="DE" term="%22dual+rotor+pump-turbine%22">dual rotor pump-turbine</searchLink><br /><searchLink fieldCode="DE" term="%22energy+efficiency%22">energy efficiency</searchLink><br /><searchLink fieldCode="DE" term="%22cycle+efficiency%22">cycle efficiency</searchLink><br /><searchLink fieldCode="DE" term="%22Pumps%22">Pumps</searchLink><br /><searchLink fieldCode="DE" term="%22MIMO+communication%22">MIMO communication</searchLink>
– Name: Abstract
  Label: Description
  Group: Ab
  Data: In an effort to make pumped hydropower storage (PHS) technology feasible for regions with a flat topography, recent research shows promising results using a contra-rotating reversible pump-turbine at low-head. In this study, the impact of dual variable speed and inlet valve control is analyzed to evaluate the effect of these three degrees of freedom (DOFs) on the system efficiency and operating range. To this end, analytical models are described to assess pump-turbine performance, conduit losses and electromechanical losses. Methodologically, optimal efficiency maps are computed for every combination of the three DOFs to evaluate individual and combined effects on the overall efficiency. Furthermore, three energy storage cycles are analyzed to further study the performance in realistic use-cases. Key conclusions include an increase in round-trip efficiency by combining variable speed ratio and inlet valve control of 5.6% and 2.0% compared with only variable speed ratio control and variable inlet valve control, respectively. Furthermore, it is shown that using only 1 DOF significantly limits the operating range, with the addition of a variable inlet valve granting a higher impact than a variable speed ratio. Combining inlet valve and speed ratio control leads not only to the highest efficiency, but also the largest operating range, with a maximum round-trip efficiency of 67.5% and an energy storage capacity of 58.6 Wh/m2. The results confirm that exploiting both dual variable speed operation and inlet valve control yields the maximum efficiency and operating range, and is thus the preferred topology for contra-rotating reversible pump-turbines in low-head operation.
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  Data: electronic
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      – Type: doi
        Value: 10.1109/ACCESS.2024.3416679
    Languages:
      – Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 15
        StartPage: 86854
    Subjects:
      – SubjectFull: Energy efficiency
        Type: general
      – SubjectFull: Computational modeling
        Type: general
      – SubjectFull: Hydroelectric power generation
        Type: general
      – SubjectFull: Numerical models
        Type: general
      – SubjectFull: Turbines
        Type: general
      – SubjectFull: Mathematical models
        Type: general
      – SubjectFull: Hydropower storage
        Type: general
      – SubjectFull: MIMO system
        Type: general
      – SubjectFull: Rotors
        Type: general
      – SubjectFull: dual rotor pump-turbine
        Type: general
      – SubjectFull: energy efficiency
        Type: general
      – SubjectFull: cycle efficiency
        Type: general
      – SubjectFull: Pumps
        Type: general
      – SubjectFull: MIMO communication
        Type: general
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      – TitleFull: Impact of Dual Variable Speed and Inlet Valve Control on the Efficiency and Operating Range of Low-Head Contra-Rotating Pump-Turbines
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              Type: published
              Y: 2024
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