Effective turbulence models and fatigue reliability in wind farms

John Dalsgaard Sørensen, Sten Tronæs Frandsen, N.J. Tarp-Johansen

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    Abstract

    Modeling of turbulence within wind farms with 100 or more wind turbines is important both for extreme and fatigue limit states. Behind a wind turbine a wake is formed where the mean wind speed decreases slightly and the turbulence intensity increases significantly. This increase ill turbulence intensity in wakes behind wind turbines can imply a significant reduction in the fatigue lifetime of wind turbines placed in wakes. Ill this paper the design code model ill the wind turbine code [IEC 61400-1, Wind turbine generator systems - Part 1: Safety requirements. 2005] is evaluated from a probabilistic point of view, including the importance of modeling the SN-curve by a bi-linear model. Fatigue models relevant for welded, cast steel and fiber reinforced details are considered. Further, the influence on the fatigue reliability is investigated from modeling the fatigue response by a stochastic part related to the ambient turbulence and the eigenfrequencies of the structure and a deterministic, sinusoidal part with frequency of revolution of the rotor. (C) 2008 Elsevier Ltd. All rights reserved.
    Original languageEnglish
    JournalProbabilistic Engineering Mechanics
    Volume23
    Issue number4
    Pages (from-to)531-538
    ISSN0266-8920
    DOIs
    Publication statusPublished - 2008

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