Inflow conditions resulting in atypical wind turbine fatigue loading

Master thesis (2019)

Authors

S.F.M. Harmsen Aerospace Engineering

Contributors

S.J. Watson (mentor)
Wouter Engels (mentor)
Faculty
Aerospace Engineering, Aerospace Engineering
Copyright: © 2019 Stefan Harmsen
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Published Date

04-01-2019

Language

English

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Faculty

Aerospace Engineering

Abstract

This master’s thesis project related inflow conditions to atypical fatigue loading of wind turbines. The research was fully based on experimental data obtained in another project. First an expected fatigue loading was defined based on the mean wind speed and the turbulence intensity. Differences between expected and measured fatigue loading were determined and analyzed using regression and clustering. The most important results regard the out-of-plane bending moment measured at the blade root and the side-to-side bending moment measured at the tower bottom. In addition to the mean wind speed and the turbulence intensity, the out-of-plane bending moment is found to correlate with wind shear. The side-to-side bending moment, on the other hand, correlates with wind veer and with different wind directions. In this case, the clustering result performs better in estimating the difference between expected and measured fatigue loading than the linear regression model.