Frequency domain approach for the coupled analysis of floating wind turbine system

ABSTRACT

This paper presents a simple frequency domain approach to predict the coupled response of floating wind turbine based on AQWA, and then investigates the effect of damping induced by wind, current and mooring system on the floating foundation response. This approach is validated against the experiment of DeepCwind floating offshore wind turbine in literatures. The results show reasonable agreement, and also indicate that the drift damping should be elaborated for the drift response. Based on this approach, the effect of wind and current on the floating wind turbine response is parametrically investigated. These aspects have rare effect on the wave frequency response, but affect the drift response due to the introduction of damping. The comparison between quasi-static and dynamic mooring line models reveals that the dynamics and added mass of mooring line play negligible roles, but the drag force significantly damps down the surge drift response.

KEYWORDS:

• Floating wind turbine
• second-order wave force
• wind and current loads
• drift damping
• quasi-static and dynamic mooring line

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The authors would like to thank the financial support by the Natural Science Foundation of Jiangsu Province [grant number BK20160557], the General Program for Colleges and Universities in Jiangsu Province [grant number 16KJD570001], National Natural Science Foundation of China [grant number 51579146], Shanghai Rising-Star Program [grant number 16QA1402300] and Major Program of National Natural Science Foundation of China [grant number 51490674].