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https://doi.org/10.5194/wes-2018-21
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Research articles 27 Mar 2018

Research articles | 27 Mar 2018

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This discussion paper is a preprint. A revision of the manuscript is under review for the journal Wind Energy Science (WES).

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

Robert Menke1, Nikola Vasiljević1, Kurt Hansen2, Andrea N. Hahmann1, and Jakob Mann1 Robert Menke et al.
  • 1Technical University of Denmark - DTU Wind Energy, Fredriksborgvej 399, Building 118, 4000 Roskilde, Denmark
  • 2Technical University of Denmark - DTU Wind Energy, Nils Koppels Allé, Building 403, 2800 Kgs. Lyngby, Denmark

Abstract. The wind turbine wake of a single 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 2 MW turbine located on one of the ridges. Different wake displacements are categorised according to the diurnal cycle. The results show a strong dependence of the vertical wake propagation to the atmospheric stability. When a terrain-induced gravity 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 horizontal.

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Robert Menke et al.
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This study investigates the behavior of wind turbine wakes in complex terrain. We measured with 6 scanning lidars the wake of a single turbine at the Perdigão site in Portugal in 2015. Findings show that the wake propagation is highly dependent on the atmospheric stability which is ignored to most parts in flow simulation used for wind-farm layout-design. The wake is lifted up during unstable atmospheric conditions and follows the terrain downwards during stable conditions.
This study investigates the behavior of wind turbine wakes in complex terrain. We measured with...
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