A robust methodology for predicting extreme structural responses of offshore wind turbines

ABSTRACT

This paper proposes a robust methodology for predicting extreme structural responses of offshore wind turbines. This robust methodology starts with forecasting an improved IFORM (Inverse-First-Order Reliability Method) environmental contour line through the use of principal component analysis. It then performs stochastic time domain simulations of an offshore wind turbine based on the information of the highest sea state identified along the aforementioned environmental contour line. Next, an enhanced Peaks-Over-Threshold (POT) method is utilised for fitting an extreme value distribution based on which a long-term extreme structural response can finally be obtained. A specific example of predicting the 50-year extreme structural responses of a monopile-supported 5MW offshore wind turbine will be provided in this paper for demonstrating the robustness of our proposed methodology.

KEYWORDS:

• Environmental contour
• principal component analysis
• Peaks-Over-Threshold method
• extreme structural responses
• offshore wind turbine

Acknowledgments

The work reported in this article has been generously supported by the funding from the Chinese State Key Laboratory of Ocean Engineering (Grant No. GKZD010075).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The work reported in this article has been generously supported by the funding from the Chinese State Key Laboratory of Ocean Engineering (grant number GKZD010075).