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Long-term extreme response of an offshore turbine: How accurate are contour-based estimates?

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  • Haselsteiner, Andreas F.
  • Frieling, Malte
  • Mackay, Ed
  • Sander, Aljoscha
  • Thoben, Klaus-Dieter

Abstract

According to design standards, offshore wind turbines need to withstand environmental loads with a return period of 50 years. This work compares the extreme response along the 50-year environmental contour with the true 50-year wind turbine response. It was found that the environmental contour method that is currently described in the IEC design standard for offshore wind turbines can strongly under-predict the 50-year return value of response variables whose annual maxima typically occur during power production. The bias in the contour-based estimate of the 50-year response can be attributed to three sources: (1) the method used to construct the contour; (2) neglecting serial correlation in environmental conditions; and (3) neglecting the short-term variability in the response. In our analysis the 50-year maximum mudline overturning moment was underestimated by 4–8% by the contour-based approach that is currently recommended, whereas the bending moment at 10 m water depth was underestimated by 25–28%. This underestimation was mainly due to ignoring the short-term variability in the response. The bias associated with contour construction, an effect much discussed in recent publications, was of much smaller magnitude.

Suggested Citation

  • Haselsteiner, Andreas F. & Frieling, Malte & Mackay, Ed & Sander, Aljoscha & Thoben, Klaus-Dieter, 2022. "Long-term extreme response of an offshore turbine: How accurate are contour-based estimates?," Renewable Energy, Elsevier, vol. 181(C), pages 945-965.
    • Handle: RePEc:eee:renene:v:181:y:2022:i:c:p:945-965
    DOI: 10.1016/j.renene.2021.09.077
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    References listed on IDEAS

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    1. Morató, A. & Sriramula, S. & Krishnan, N. & Nichols, J., 2017. "Ultimate loads and response analysis of a monopile supported offshore wind turbine using fully coupled simulation," Renewable Energy, Elsevier, vol. 101(C), pages 126-143.
    2. Liu, Jinsong & Thomas, Edwin & Goyal, Anshul & Manuel, Lance, 2019. "Design loads for a large wind turbine supported by a semi-submersible floating platform," Renewable Energy, Elsevier, vol. 138(C), pages 923-936.
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