Long-term extreme structural loads of a triple-column spar floating wind turbine concept

Li, Liang and Wang, Jin; Chung, Jin S. and Akselsen, Odd M. and Jin, HyunWoo and Kawai, Hiroyasu and Lee, Yongwon and Matskevitch, Dmitri and Ho Van, Suak and Wan, Decheng and Wang, Alan M. and Yamaguchi, Satoru, eds. (2019) Long-term extreme structural loads of a triple-column spar floating wind turbine concept. In: Proceedings of the 29th International Ocean and Polar Engineering Conference. Proceedings of the International Offshore and Polar Engineering Conference . International Society of Offshore and Polar Engineers, USA, pp. 412-418. ISBN 9781880653852 (https://onepetro.org/conference-paper/ISOPE-I-19-0...)

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A novelty floating wind turbine concept, which utilizes a newly developed triple-column spar platform to support the NREL 5MW baseline wind turbine, is proposed in this research. A modified environmental counter method is proposed to estimate the long-term extreme response of the novelty concept. Aero-hydro-servo-elastic coupled simulations are performed. Numerical simulations demonstrate that the triple-column Spar floating wind turbine has a better dynamic performance compared with a single-column concept, in terms of platform motion, tower base structural loads and mooring line tension. The critical environmental condition is identified with the modified environmental contour method, and it is shown that the 50-year return period extreme tower base structural load is reduced with the application of the three-column Spar platform. Nevertheless, the extreme mooring line tension which is dominated by the wind load, is not reduced. The present research reveals the prospect of the three-column Spar concept in the offshore wind energy application.