Cristin-resultat-ID: 1476016
Sist endret: 23. januar 2018 11:43
NVI-rapporteringsår: 2017
Resultat
Vitenskapelig artikkel
2017

Medium fidelity modelling of loads in wind farms under non-neutral ABL stability conditions – a full-scale validation study

Bidragsytere:
  • Gunner Larsen
  • T. J. Larsen og
  • Abhijit Chougule

Tidsskrift

Journal of Physics: Conference Series
ISSN 1742-6588
e-ISSN 1742-6596
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2017
Volum: 854
Hefte: 1

Importkilder

Scopus-ID: 2-s2.0-85023616556

Beskrivelse Beskrivelse

Tittel

Medium fidelity modelling of loads in wind farms under non-neutral ABL stability conditions – a full-scale validation study

Sammendrag

The aim of the present paper is to demonstrate the capability of medium fidelity modelling of wind turbine component fatigue loading, when the wind turbines are subjected to wake affected non-stationary flow fields under non-neutral atmospheric stability conditions. To accomplish this we combine the classical Dynamic Wake Meandering model with a fundamental conjecture stating: Atmospheric boundary layer stability affects primary wake meandering dynamics driven by large turbulent scales, whereas wake expansion in the meandering frame of reference is hardly affected. Inclusion of stability (i.e. buoyancy) in description of both large- and small scale atmospheric boundary layer turbulence is facilitated by a generalization of the classical Mann spectral tensor, which consistently includes buoyancy effects. With non-stationary wind turbine inflow fields modelled as described above, fatigue loads are obtained using the state-of-the art aeroelastic model HAWC2. The Lillgrund offshore wind farm (WF) constitute an interesting case study for wind farm model validation, because the WT interspacing is small, which in turn means that wake effects are significant. A huge data set, comprising 5 years of blade and tower load recordings, is available for model validation. For a multitude of wake situations this data set displays a considerable scatter, which to a large degree seems to be caused by atmospheric boundary layer stability effects. Notable is also that rotating wind turbine components predominantly experience high fatigue loading for stable stratification with significant shear, whereas high fatigue loading of non-rotating wind turbine components are associated with unstable atmospheric boundary layer stratification.

Bidragsytere

Gunner Larsen

  • Tilknyttet:
    Forfatter
    ved Danmarks Tekniske Universitet

T. J. Larsen

  • Tilknyttet:
    Forfatter
    ved Danmarks Tekniske Universitet

Abhijit Chougule

  • Tilknyttet:
    Forfatter
    ved Institutt for ingeniørvitenskap ved Universitetet i Agder
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