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Geometry assessment of a sloped type wave energy converter

Author

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  • Giannini, Gianmaria
  • López, Mario
  • Ramos, Victor
  • Rodríguez, Claudio A.
  • Rosa-Santos, Paulo
  • Taveira-Pinto, Francisco

Abstract

Oscillatory wave energy converters of the sloped type may allow absorbing power from ocean waves efficiently if a valid optimal design is used. In earlier studies, the optimized geometry for the CECO device was defined by implementing a simplified frequency-domain model. In this paper, that geometry is evaluated against the former one by taking into consideration a more realistic modelling approach and assessment scenario. The two geometries were benchmarked through a time-domain model, which allows taking into account realistic sea states and the use of end-stops to limit the amplitude of CECO motions. It was concluded that the optimized geometry allows extra energy production for most of the irregular sea states evaluated (45% more annual energy production). Performance indices were also used to compare the two geometries and it was concluded that the optimized geometry was particularly advantageous for the more energetic sea states. Overall, this study clearly shows that the choice of the generator rated power and end-stops span length are key aspects in determining realistically the annual energy production of sloped-motion wave energy converters.

Suggested Citation

  • Giannini, Gianmaria & López, Mario & Ramos, Victor & Rodríguez, Claudio A. & Rosa-Santos, Paulo & Taveira-Pinto, Francisco, 2021. "Geometry assessment of a sloped type wave energy converter," Renewable Energy, Elsevier, vol. 171(C), pages 672-686.
    • Handle: RePEc:eee:renene:v:171:y:2021:i:c:p:672-686
    DOI: 10.1016/j.renene.2021.02.132
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    References listed on IDEAS

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    1. Gianmaria Giannini & Paulo Rosa-Santos & Victor Ramos & Francisco Taveira-Pinto, 2020. "On the Development of an Offshore Version of the CECO Wave Energy Converter," Energies, MDPI, vol. 13(5), pages 1-24, February.
    2. Margheritini, L. & Vicinanza, D. & Frigaard, P., 2009. "SSG wave energy converter: Design, reliability and hydraulic performance of an innovative overtopping device," Renewable Energy, Elsevier, vol. 34(5), pages 1371-1380.
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    4. Ramos, V. & López, M. & Taveira-Pinto, F. & Rosa-Santos, P., 2017. "Influence of the wave climate seasonality on the performance of a wave energy converter: A case study," Energy, Elsevier, vol. 135(C), pages 303-316.
    5. Rosa-Santos, Paulo & Taveira-Pinto, Francisco & Rodríguez, Claudio A. & Ramos, Victor & López, Mario, 2019. "The CECO wave energy converter: Recent developments," Renewable Energy, Elsevier, vol. 139(C), pages 368-384.
    6. Kofoed, Jens Peter & Frigaard, Peter & Friis-Madsen, Erik & Sørensen, Hans Chr., 2006. "Prototype testing of the wave energy converter wave dragon," Renewable Energy, Elsevier, vol. 31(2), pages 181-189.
    7. Rodríguez, Claudio A. & Rosa-Santos, Paulo & Taveira-Pinto, Francisco, 2019. "Assessment of damping coefficients of power take-off systems of wave energy converters: A hybrid approach," Energy, Elsevier, vol. 169(C), pages 1022-1038.
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