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Master of Wind Energy
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Danish Center for Computational Wind Turbine Aerodynamics and Atmospheric Turbulence

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Title : Validation of NewGust and a comparison with other wind gust simulation methods.
Authors : ing. Kundert de Wit

Summary :
As wind turbines are getting persistently larger, optimization of the wind turbine with respect to strength and material usage is getting more and more important. The relative increase in importance of the optimization of material usage lies in its direct connection with investment costs. The mass and costs of a turbine rotor scales with (blade length)2:6, while the energy yield scales with (blade length)2:2. This shows that at a certain point, costs will exceed revenues. Hence, optimization is becoming more important with larger turbines, in order to outsmart the current scaling laws. For this optimization, proper fatigue analysis and assessment of the extreme loads is highly important. Fatigue analysis has been done in a stochastic way for a long time. This basically means that for load calculations a stochastic representation of a turbulent wind is generated, which is used as the input for a simulation program of the wind turbine. For the assessment of extreme loads wind gusts are important. Until now, gusts of a deterministic shape have been used, which is in contrast with the common practice for fatigue analysis. In this context the NewGust method has been developed by Wim Bierbooms at DUWIND. NewGust is a method for simulating wind speed gusts of any desired length and amplitude. The validity of the resulting gust shape has already been proved by several articles, but until now nobody looked at the validity of the load response resulting from wind gusts simulated according to the NewGust method. The main research question of this thesis is: What is the validity of the mean load response resulting from wind speed gusts simulated with the NewGust method with respect to measured gusts? Within this context, also some di erent stochastic gust simulation methods have been compared with respect to mean gust and load response shape. During the process, two other question arose: What is the gust shape causing the extreme loads of a pitch-regulated wind turbine? How do different stochastic methods compare to each other with respect to the 50-years' extreme value?

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