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Sea trials of Sigma wave energy converter – Power and efficiency

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  • Dragić, Mile
  • Hofman, Milan
  • Tomin, Veselin
  • Miškov, Vladimir

Abstract

Sigma Energy has performed its foremost prototype tests of a scaled wave energy converter (WEC) in a real sea environment. The prototype was a point absorber with a circular buoy, a mechanical power take-off (PTO) system and a counterweight, moored to the seabed as a tension leg platform with three equal tendons. In these extensive experiments, numerous device characteristics were measured and analysed. The paper presents these sea trials, focusing on the power and efficiency of the device. The power has been calculated from the data recorded at 6 locations along the PTO system. In that way, a decay of capture width ratio (CWR) from the one absorbed from the waves to the one delivered to the electrical network was found and analysed. Also, losses of the main elements of the PTO system were defined, calculated and ranked. Optimal sea and loading conditions were indicated, giving the maximal values of the efficiencies. These optimal conditions are physically explained, and the challenges in their prediction are discussed. In addition to the results of numerous 20-min tests, the paper presents the long-term average values of the efficiencies, covering all the tests performed, and accounting for the probabilities of different sea conditions.

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  • Dragić, Mile & Hofman, Milan & Tomin, Veselin & Miškov, Vladimir, 2023. "Sea trials of Sigma wave energy converter – Power and efficiency," Renewable Energy, Elsevier, vol. 206(C), pages 748-766.
    • Handle: RePEc:eee:renene:v:206:y:2023:i:c:p:748-766
    DOI: 10.1016/j.renene.2023.02.055
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    References listed on IDEAS

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    1. Yue Hong & Irina Temiz & Jianfei Pan & Mikael Eriksson & Cecilia Boström, 2021. "Damping Studies on PMLG-Based Wave Energy Converter under Oceanic Wave Climates," Energies, MDPI, vol. 14(4), pages 1-21, February.
    2. Babarit, A., 2015. "A database of capture width ratio of wave energy converters," Renewable Energy, Elsevier, vol. 80(C), pages 610-628.
    3. Babarit, A. & Hals, J. & Muliawan, M.J. & Kurniawan, A. & Moan, T. & Krokstad, J., 2012. "Numerical benchmarking study of a selection of wave energy converters," Renewable Energy, Elsevier, vol. 41(C), pages 44-63.
    4. Tunde Aderinto & Hua Li, 2019. "Review on Power Performance and Efficiency of Wave Energy Converters," Energies, MDPI, vol. 12(22), pages 1-24, November.
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    Cited by:

    1. Gu, Hanbin & Stansby, Peter & Zhang, Zhaode & Zhu, Gancheng & Lin, Pengzhi & Shi, Huabin, 2023. "Research and concept design of wave energy converter on ocean squid jigging ship," Energy, Elsevier, vol. 285(C).
    2. Chen, Xinhui & Wei, Jianfeng & Sheng, Songwei & Wang, Wensheng & Wang, Kunlin & Zhang, Yaqun & Wang, Zhenpeng, 2023. "Design and experimental study of a novel type water-filled submerged flexible bag wave energy converter," Renewable Energy, Elsevier, vol. 218(C).

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