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Floating spar-buoy wind turbines (FOWTs) offer a viable solution for power generation at deep-water sites such as the Norwegian Continental Shelf. This study models a 15 MW spar buoy installed in 1 200 m water depth and subjected to irregular seas with significant wave heights up to 20 m; the largest individual waves reach 30 m crest-to-trough. Hydrodynamic loads from ANSYS AQWA diffraction and radiation analysis feed a comprehensive 400 s nonlinear time-domain simulation that explicitly captures large horizontal drift and mooring-line re-tensioning for the hull, a three-line catenary mooring, and a lazy-wave export cable. The deep-ballasted slender spar, with a metacentric height of about 16 m, limits pitch and roll to less than 6°, while heave stays within ± 10 m. Surge offsets average 120 m with a single 225 m peak, yet the platform recentres after each extreme wave. Peak mooring and cable tensions are 0.12 MN, below three percent of their 5 to 13 MN breaking capacities. These results confirm spar FOWT robustness in severe North-Sea storms and emphasise the importance of controlling horizontal excursion and tether dynamics.

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An Investigation of the Dynamic Behaviour of Offshore Wind Turbine Support Structures in Harsh Norwegian Marine Environments

  • 会议论文

  • 发表日期：

    2025年

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  • Ioannis Karlos Angelopoulos,
  • Cliff Dansoh

摘要

Floating spar-buoy wind turbines (FOWTs) offer a viable solution for power generation at deep-water sites such as the Norwegian Continental Shelf. This study models a 15 MW spar buoy installed in 1 200 m water depth and subjected to irregular seas with significant wave heights up to 20 m; the largest individual waves reach 30 m crest-to-trough. Hydrodynamic loads from ANSYS AQWA diffraction and radiation analysis feed a comprehensive 400 s nonlinear time-domain simulation that explicitly captures large horizontal drift and mooring-line re-tensioning for the hull, a three-line catenary mooring, and a lazy-wave export cable. The deep-ballasted slender spar, with a metacentric height of about 16 m, limits pitch and roll to less than 6°, while heave stays within ± 10 m. Surge offsets average 120 m with a single 225 m peak, yet the platform recentres after each extreme wave. Peak mooring and cable tensions are 0.12 MN, below three percent of their 5 to 13 MN breaking capacities. These results confirm spar FOWT robustness in severe North-Sea storms and emphasise the importance of controlling horizontal excursion and tether dynamics.