Numerical investigations into the idealized diurnal cycle of atmospheric boundary layer and its impact on wind turbine's power performance

Research output: Contribution to journalJournal article – Annual report year: 2020Researchpeer-review

  • Author: Tian, Linlin

    Nanjing University of Aeronautics and Astronautics

  • Author: Song, Yilei

    Nanjing University of Aeronautics and Astronautics

  • Author: Zhao, Ning

    Nanjing University of Aeronautics and Astronautics

  • Author: Shen, Wen Zhong

    Fluid Mechanics, Department of Wind Energy, Technical University of Denmark, Nils Koppels Allé, 2800, Kgs. Lyngby, Denmark

  • Author: Wang, Tongguang

    Nanjing University of Aeronautics and Astronautics

  • Author: Zhu, Chunling

    Nanjing University of Aeronautics and Astronautics

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The power generated by a wind turbine largely depends on the properties of wind resource. In this work, wind characteristics in different regimes occurring throughout the idealized diurnal cycle and its impact on wind turbine's power performance are investigated systematically by means of large-eddy simulation (LES), and blade element momentum method (BEM), respectively. Through a precursor simulation of the atmospheric boundary layer (ABL) over a homogenous surface throughout a day, it is found that the resulting shapes of wind profiles (including wind speed, wind direction and turbulence level) vary significantly at different time periods, induced by distinct stabilities of the atmosphere. The simulated wind field data are then applied to a NREL 5 MW wind turbine for its power evaluation. Due to variabilities in wind shear and turbulence, the equivalent (disk-averaged) wind speed is introduced for power prediction. It is found that the magnitude and fluctuation of turbine's diurnal power are closely related to the atmospheric stability. In general, the average power production is higher under convective conditions during the day than under stable conditions at night, with a difference approaching 24.4%. This indicates that wind energy resource assessment will close to reality and benefit from increased accuracy if atmospheric stability impacts are considered for turbine's power predictions.
Original languageEnglish
JournalRenewable Energy
Volume145
Pages (from-to)419-427
Number of pages9
ISSN0960-1481
DOIs
Publication statusPublished - 2020
CitationsWeb of Science® Times Cited: No match on DOI

    Research areas

  • Atmospheric boundary layer (ABL), Atmospheric stability, Diurnal wind characteristics, Large-eddy simulation, Wind power output, Wind turbine
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