A floating offshore wind turbine platform supporting a 2MW downwind-type turbine was successfully installed offshore of Kabashima Island, Goto city, Nagasaki prefecture, Japan on October 18, 2013. It has been operating since October 28, 2013 as the first grid-connected multi-megawatt floating wind turbine in Japan. The spar platform has a unique feature, that is, the upper part of the spar is made of steel (as usual) but the lower part is made of precast prestressed concrete (PC). Such a configuration is referred to as hybrid-spar. In this paper, the design methodology of the hybrid spar is presented — including environmental design conditions, DLCs (Design Load Cases), dynamic analysis, fatigue analysis, etc. Also, the installation procedure is presented briefly.
Design and Installation of a Hybrid-Spar Floating Wind Turbine Platform
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Utsunomiya, T, Sato, I, Kobayashi, O, Shiraishi, T, & Harada, T. "Design and Installation of a Hybrid-Spar Floating Wind Turbine Platform." Proceedings of the ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. Volume 9: Ocean Renewable Energy. St. John’s, Newfoundland, Canada. May 31–June 5, 2015. V009T09A063. ASME. https://doi.org/10.1115/OMAE2015-41544
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