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Coplanar lidar measurement of a single wind energy converter wake in distinct atmospheric stability regimes at the Perdigão 2017 experiment

Wildmann, Norman and Kigle, Stephan and Gerz, Thomas (2018) Coplanar lidar measurement of a single wind energy converter wake in distinct atmospheric stability regimes at the Perdigão 2017 experiment. Journal of Physics: Conference Series, 1037 (5), pp. 1-10. Institute of Physics (IOP) Publishing. DOI: 10.1088/1742-6596/1037/5/052006 ISSN 1742-6588

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Official URL: http://stacks.iop.org/1742-6596/1037/i=5/a=052006

Abstract

The understanding of wakes of wind energy converters (WEC) is highly relevant to wind-energy research. In orographically complex terrain, wind is amplified at ridges but also varies significantly, exhibiting strong gustiness and enhanced turbulence levels compared to wind conditions in flat terrain. In this study, long-range lidar instruments are used to detect and analyse the wake of a single WEC in complex terrain in different atmospheric stability regimes. The special orography of two parallel mountain ridges at the Perdigão 2017 experiment allowed to place two lidars in a coplanar set-up and retrieve horizontal as well as vertical wind speed in a cross-section of the terrain which is in-plane with the WEC. In cases of main wind direction, which is parallel to the lidar scans, the wake's propagation can thus be measured far downstream in the valley. A wake tracking algorithm is proposed to automatically detect the wake center in the lidar scans for three periods with distinct atmospheric stability conditions. Wind speed deficits and wake propagation paths are quantified and categorized accordingly. A careful uncertainty estimation is done for the coplanar wind retrieval.

Item URL in elib:https://elib.dlr.de/120989/
Document Type:Article
Title:Coplanar lidar measurement of a single wind energy converter wake in distinct atmospheric stability regimes at the Perdigão 2017 experiment
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wildmann, NormanDLR, IPAhttps://orcid.org/0000-0001-9475-4206
Kigle, StephanDLR, IPAUNSPECIFIED
Gerz, ThomasDLR, IPAUNSPECIFIED
Date:June 2018
Journal or Publication Title:Journal of Physics: Conference Series
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:No
Volume:1037
DOI :10.1088/1742-6596/1037/5/052006
Page Range:pp. 1-10
Publisher:Institute of Physics (IOP) Publishing
ISSN:1742-6588
Status:Published
Keywords:Wind energy, wind turbine wakes, atmospheric stability, lidar
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Wind Energy
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Wind Energy
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Transport Meteorology
Deposited By: Wildmann, Norman
Deposited On:19 Jul 2018 14:08
Last Modified:19 Jul 2018 14:16

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