The effect of wake position and yaw misalignment on power loss in wind turbines

Albert M. Urbán*, Jaime Yikon Liew, Ebba Dellwik, Gunner Chr. Larsen

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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    For a single wind turbine, the efficiency of extracting energy from the wind depends on the ability to align the wind turbine with the dominating wind direction. Considering average power production, yaw misalignment is relevant when the wind turbine operates with maximum power coefficient. On the other hand, the power production is less sensitive to yaw misalignment in high wind speeds, where the available energy in the wind field is higher than the maximum wind turbine capacity. In a wind farm, the interaction between nearby wind turbines alters the flow, and the power production is reduced. The present study investigates how yaw misalignment affects the power production in these wake situations compared to yaw misalignment effects for a wind turbine in the free-stream. Two generic cases are presented in this paper, offshore and forest, where the atmospheric conditions alter the morphology of the wake and, therefore, the power output of a yawed wind turbine operating in wake conditions. The results show that, for a conventional downstream spacing further than 3 rotor diameters, yaw misalignment results in larger power loss in wake situations than in free-stream. In wake situations, the presented results also show that the spatial distribution of the deficit influences the relative power loss when the wind turbine is operating in yawed conditions.
    Original languageEnglish
    Title of host publicationProceedings of the WindEurope Conference and Exhibition 2019
    Number of pages8
    Publication date2019
    Article number012002
    Publication statusPublished - 2019
    EventWindEurope Conference and Exhibition 2019: Delivering a Clean Economy for all Europeans - BEC – Bilbao Exhibition Centre , Bilbao, Spain
    Duration: 2 Apr 20194 Apr 2019


    ConferenceWindEurope Conference and Exhibition 2019
    LocationBEC – Bilbao Exhibition Centre
    Internet address
    SeriesJournal of Physics: Conference Series (Online)
    NumberConf. 1

    Bibliographical note

    Content from this work may be used under the terms of theCreative Commons Attribution 3.0 licence. Any further distributionof this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.Published under licence by IOP Publishing Ltd


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