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In-stream energy converters in a river – Effects on upstream hydropower station

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  • Lalander, Emilia
  • Leijon, Mats

Abstract

The use of in-stream energy converters in rivers is an area of research that is still in its preliminary stages. The driving force of river flows is the potential energy the water gains when it precipitates on mountainsides, and this energy is traditionally converted by hydropower stations, where dams are used to create a larger head. Using an in-stream energy converter would be advantageous in areas restricted by regulation. In this paper the effects of using these converters on the upstream water level in a river are studied. This has been done both with an analytical model and with a numerical model. The analytical model described the water level increase due to energy capture to depend on how large fraction of the channel that is blocked by the turbine. It was also shown that as the converter induces drag on the flow, and as energy is lost in wake mixing, the total head loss will be a sum of energy capture and energy losses. The losses correspond to a considerable fraction of the total head drop. The numerical model was used to evaluate these results. The model used was the 3D numerical model MIKE from the DHI Group in Sweden. Turbines were modelled with an inbuilt function in the program. The results from the model did not correspond to the analytical results, as the energy capture was equal to the head drop in the program.

Suggested Citation

  • Lalander, Emilia & Leijon, Mats, 2011. "In-stream energy converters in a river – Effects on upstream hydropower station," Renewable Energy, Elsevier, vol. 36(1), pages 399-404.
    • Handle: RePEc:eee:renene:v:36:y:2011:i:1:p:399-404
    DOI: 10.1016/j.renene.2010.05.019
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    References listed on IDEAS

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    1. Carballo, R. & Iglesias, G. & Castro, A., 2009. "Numerical model evaluation of tidal stream energy resources in the Ría de Muros (NW Spain)," Renewable Energy, Elsevier, vol. 34(6), pages 1517-1524.
    2. Khan, M.J. & Iqbal, M.T. & Quaicoe, J.E., 2008. "River current energy conversion systems: Progress, prospects and challenges," Renewable and Sustainable Energy Reviews, Elsevier, vol. 12(8), pages 2177-2193, October.
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    3. Iglesias, G. & Sánchez, M. & Carballo, R. & Fernández, H., 2012. "The TSE index – A new tool for selecting tidal stream sites in depth-limited regions," Renewable Energy, Elsevier, vol. 48(C), pages 350-357.
    4. Yuce, M. Ishak & Muratoglu, Abdullah, 2015. "Hydrokinetic energy conversion systems: A technology status review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 43(C), pages 72-82.
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    6. Fairley, I. & Masters, I. & Karunarathna, H., 2015. "The cumulative impact of tidal stream turbine arrays on sediment transport in the Pentland Firth," Renewable Energy, Elsevier, vol. 80(C), pages 755-769.
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