DYNAMIC RESPONSE ANALYSIS OF AN ULTRA-LARGE SEMI-SUBMERSIBLE FLOATING WIND TURBINE UNDER SECOND-ORDER WAVE FORCES

Zhao Zhixin; Shi Wei; Wang Wenhua; Li Xin

doi:10.19912/j.0254-0096.tynxb.2021-0992

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (1) : 335-345. DOI: 10.19912/j.0254-0096.tynxb.2021-0992

DYNAMIC RESPONSE ANALYSIS OF AN ULTRA-LARGE SEMI-SUBMERSIBLE FLOATING WIND TURBINE UNDER SECOND-ORDER WAVE FORCES

Zhao Zhixin^1,2, Shi Wei^2,3, Wang Wenhua^1,2, Li Xin^1,2

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Abstract

For DTU （Technical University of Denmark, DTU） 10 MW wind turbines, the fully coupled analysis for the semi-submersible floating offshore wind turbine （FOWT） system was conducted by using FAST software under the typical sea states with different hydrodynamic components to compare and analyze the effect of second-order difference- and sum-frequency wave forces on the dynamic responses of the ultra-large semi-submersible FOWT, including only first-order wave force, first- and second-order difference-frequency wave forces calculated by Newman’s approximation and full-field quadratic transfer functions （QTFs）,respectively, first- and second-order sum-frequency wave forces calculated by full-field QTFs, and first- and complete second-order wave forces calculated by full-field QTFs. Based on the fatigue calculation theory of the wind turbine structure, the effect of second-order difference- and sum-frequency wave forces on the fatigue failure of the wind turbine structure is analyzed. The study found that under extreme sea states,second-order difference-frequency wave force has a significant effect on the platform motions, and the second-order difference- and sum-frequency wave forces has a significant effect on the structural loads and fatigue failure of the semi-submersible FOWT. In addition, the Newman’s approximation method obviously underestimates the effect of second-order difference-frequency wave forces on the dynamic response of the semi-submersible FOWT.

Key words

offshore wind power / dynamic response / hydrodynamics / fatigue analysis / semi-submersible floating wind turbine / time domain fully coupled analysis

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Zhao Zhixin, Shi Wei, Wang Wenhua, Li Xin. DYNAMIC RESPONSE ANALYSIS OF AN ULTRA-LARGE SEMI-SUBMERSIBLE FLOATING WIND TURBINE UNDER SECOND-ORDER WAVE FORCES[J]. Acta Energiae Solaris Sinica. 2023, 44(1): 335-345 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0992

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