Fatigue reassessment for lifetime extension of offshore wind monopile substructures

The Science of Making Torque from Wind

Ziegler, Lisa^1,2 ; Muskulus, Michael^2

Ramboll Wind, Hamburg, Germany^1

Department of Civil and Transport Engineering, NTNU, Trondheim, Norway^2

关键词: elementary effects;    Fatigue lifetime;    Global sensitivity;    Lifetime extension;    Offshore winds;    Operational parameters;    Operational phase;    Turbulence intensity;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/753/9/092010/pdf
DOI  :  10.1088/1742-6596/753/9/092010

来源: IOP

【 摘 要 】

Fatigue reassessment is required to decide about lifetime extension of aging offshore wind farms. This paper presents a methodology to identify important parameters to monitor during the operational phase of offshore wind turbines. An elementary effects method is applied to analyze the global sensitivity of residual fatigue lifetimes to environmental, structural and operational parameters. Therefore, renewed lifetime simulations are performed for a case study which consists of a 5 MW turbine with monopile substructure in 20 m water depth. Results show that corrosion, turbine availability, and turbulence intensity are the most influential parameters. This can vary strongly for other settings (water depth, turbine size, etc.) making case-specific assessments necessary.