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Investigation of Site-Specific Wind Field Parameters and Their Effect on Loads of Offshore Wind Turbines

Author

Listed:
  • Benedikt Ernst

    (ForWind - Center for Wind Energy Research, Institute of Turbomachinery and Fluid Dynamics, Leibniz Universität Hannover, Appelstrasse 9, Hannover 30167, Germany)

  • Jörg R. Seume

    (ForWind - Center for Wind Energy Research, Institute of Turbomachinery and Fluid Dynamics, Leibniz Universität Hannover, Appelstrasse 9, Hannover 30167, Germany)

Abstract

The main contributing factors to unsteady loading of Offshore Wind Turbines (OWT) are wind shear, turbulence, and waves. In the present paper, the turbulence intensity and the wind shear exponent are investigated. Using data from the FINO 1 research platform, these parameters are analyzed and compared with the proposed wind field parameters in the IEC standard 61400-3. Based on this analysis, aeroelastic simulations are performed to determine the effect of wind field parameters on the fatigue and the extreme loads on the rotor blades. For the investigations, the aeroelastic model of a 5 MW OWT is used with a focus on design load cases in an operating state (power production). The fatigue loads are examined by means of the damage-equivalent load-range approach. In order to determine the extreme loads with a recurrence period of 50 years, a peak over threshold extrapolation method and a novel method based on average conditional exceedance rates are used. The results show that the requirements of the IEC standard are very conservative for the design of the rotor blades. Therefore, there could be a large optimization potential for the reduction of weight and cost of the rotor blades.

Suggested Citation

  • Benedikt Ernst & Jörg R. Seume, 2012. "Investigation of Site-Specific Wind Field Parameters and Their Effect on Loads of Offshore Wind Turbines," Energies, MDPI, vol. 5(10), pages 1-21, October.
    • Handle: RePEc:gam:jeners:v:5:y:2012:i:10:p:3835-3855:d:20503
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    Citations

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    Cited by:

    1. Häfele, Jan & Hübler, Clemens & Gebhardt, Cristian Guillermo & Rolfes, Raimund, 2018. "A comprehensive fatigue load set reduction study for offshore wind turbines with jacket substructures," Renewable Energy, Elsevier, vol. 118(C), pages 99-112.
    2. Rezaeiha, Abdolrahim & Pereira, Ricardo & Kotsonis, Marios, 2017. "Fluctuations of angle of attack and lift coefficient and the resultant fatigue loads for a large Horizontal Axis Wind turbine," Renewable Energy, Elsevier, vol. 114(PB), pages 904-916.
    3. Wang, Shuaishuai & Moan, Torgeir & Jiang, Zhiyu, 2022. "Influence of variability and uncertainty of wind and waves on fatigue damage of a floating wind turbine drivetrain," Renewable Energy, Elsevier, vol. 181(C), pages 870-897.
    4. Xu, Sheng & Wang, Shan & Guedes Soares, C., 2019. "Review of mooring design for floating wave energy converters," Renewable and Sustainable Energy Reviews, Elsevier, vol. 111(C), pages 595-621.

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