Does the wind turbine wake follow the topography? A multi-lidar study in complex terrain

Robert Menke*, Nikola Vasiljević, Kurt Schaldemose Hansen, Andrea N. Hahmann, Jakob Mann

*Corresponding author for this work

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The wake of a single wind turbine in complex terrain is analysed using measurements from lidars. A particular focus of this analysis is the wake deficit and propagation. Six scanning lidars (three short-range and three long-range WindScanners) were deployed during the Perdigão 2015 measurement campaign, which took place at a double-ridge site in Portugal. Several scanning scenarios, including triple- and dual-Doppler scans, were designed to capture the wind turbine wake of a 2MW turbine located on one of the ridges. Different wake displacements are categorized according to the time of the day. The results show a strong dependence of the vertical wake propagation on the atmospheric stability. When an atmospheric wave is observed under stable conditions, the wake follows the terrain down the ridge with a maximum inclination of −28°. During unstable conditions, the wake is advected upwards by up to 29° above the horizontal plane.
Original languageEnglish
JournalWind Energy Science
Issue number2
Pages (from-to)681-691
Publication statusPublished - 2018


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