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Annual performance of the second-generation variable-geometry oscillating surge wave energy converter

Author

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  • Kelly, Michael
  • Tom, Nathan
  • Yu, Yi-Hsiang
  • Wright, Alan
  • Lawson, Michael

Abstract

Recent studies in wave energy have highlighted the need for a structured innovation approach in wave energy converter (WEC) design because cost-of-energy estimates have remained high. One such innovation being investigated by the National Renewable Energy Laboratory is WEC geometry control, which uses control surfaces in combination with an oscillating surge WEC (OSWEC) to increase device availability and power generation while limiting structural costs. This study performs the first analysis of annual performance for a novel OSWEC with geometry control to understand how the geometry control affects availability, annual power generation, and structural loadings like the power-take-off (PTO) torque or surge foundation force. Device hydrodynamic coefficients are calculated using linear potential theory for six geometry configurations. A nonideal PTO system is assumed and quadratic viscous damping losses are considered. Annual performance is evaluated and compared for three U.S. wave energy sites. The WEC geometry and PTO system are controlled on a sea-state basis to optimize for power capture while remaining under limits set on motion amplitude and structural loads. Results indicate that geometry control can increase availability up to 25 days in an average year depending on design limits, increase average power generation, and significantly reduce peak structural loads.

Suggested Citation

  • Kelly, Michael & Tom, Nathan & Yu, Yi-Hsiang & Wright, Alan & Lawson, Michael, 2021. "Annual performance of the second-generation variable-geometry oscillating surge wave energy converter," Renewable Energy, Elsevier, vol. 177(C), pages 242-258.
    • Handle: RePEc:eee:renene:v:177:y:2021:i:c:p:242-258
    DOI: 10.1016/j.renene.2020.11.075
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    References listed on IDEAS

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    1. Babarit, A., 2015. "A database of capture width ratio of wave energy converters," Renewable Energy, Elsevier, vol. 80(C), pages 610-628.
    2. Tom, N.M. & Lawson, M.J. & Yu, Y.H. & Wright, A.D., 2016. "Development of a nearshore oscillating surge wave energy converter with variable geometry," Renewable Energy, Elsevier, vol. 96(PA), pages 410-424.
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