Volume 3, issue 2 | Copyright

Special issue: Flow in complex terrain: the Perdigão campaigns (WES/ACP/AMT...

Wind Energ. Sci., 3, 681-691, 2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research articles 10 Oct 2018

Research articles | 10 Oct 2018

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

Robert Menke1, Nikola Vasiljević1, Kurt S. 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 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.

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Short summary
This study investigates the behaviour of wind turbine wakes in complex terrain. Using six scanning lidars, we measured the wake of a single turbine at the Perdigão site in Portugal in 2015. Our findings show that wake propagation is highly dependent on the atmospheric stability, which is mostly ignored 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 behaviour of wind turbine wakes in complex terrain. Using six...