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Wind Turbine Wake Measurements with Automatically Adjusting Scanning Trajectories in a Multi-Doppler Lidar Setup

Wildmann, Norman and Vasiljevic, Nicola and Gerz, Thomas (2018) Wind Turbine Wake Measurements with Automatically Adjusting Scanning Trajectories in a Multi-Doppler Lidar Setup. Atmospheric Measurement Techniques, 11, pp. 3801-3814. Copernicus Publications. DOI: 10.5194/amt-11-3801-2018 ISSN 1867-1381

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Official URL: https://www.atmos-meas-tech.net/11/3801/2018/

Abstract

In the context of the Perdigão 2017 experiment, the German Aerospace Center (DLR) deployed three long-range scanning Doppler lidars with the dedicated purpose of investigating the wake of a single wind turbine at the experimental site. A novel method was tested for the first time to investigate wake properties with ground-based lidars over a wide range of wind directions. For this method, the three lidars, which were space- and time-synchronized using the WindScanner software, were programmed to measure with crossing beams at individual points up to 10 rotor diameters downstream of the wind turbine. Every half hour, the measurement points were adapted to the current wind direction to obtain a high availability of wake measurements in changing wind conditions. The linearly independent radial velocities where the lidar beams intersect allow the calculation of the wind vector at those points. Two approaches to estimating the prevailing wind direction were tested throughout the campaign. In the first approach, velocity azimuth display (VAD) scans of one of the lidars were used to calculate a 5min average of wind speed and wind direction every half hour, whereas later in the experiment 5min averages of sonic anemometer measurements of a meteorological mast close to the wind turbine became available in real time and were used for the scanning adjustment. Results of wind speed deficit measurements are presented for two measurement days with varying northwesterly winds, and it is evaluated how well the lidar beam intersection points match the actual wake location. The new method allowed wake measurements to be obtained over the whole measurement period, whereas a static scanning setup would only have captured short periods of wake occurrences.

Item URL in elib:https://elib.dlr.de/120986/
Document Type:Article
Title:Wind Turbine Wake Measurements with Automatically Adjusting Scanning Trajectories in a Multi-Doppler Lidar Setup
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wildmann, NormanDLR, IPAhttps://orcid.org/0000-0001-9475-4206
Vasiljevic, NicolaTechnical University, Roskilde, Denmarkhttps://orcid.org/0000-0002-9381-9693
Gerz, ThomasDLR, IPAUNSPECIFIED
Date:28 June 2018
Journal or Publication Title:Atmospheric Measurement Techniques
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:11
DOI :10.5194/amt-11-3801-2018
Page Range:pp. 3801-3814
Publisher:Copernicus Publications
Series Name:Flow in complex terrain: the Perdigão campaigns
ISSN:1867-1381
Status:Published
Keywords:Wind energy, lidar, wake, wind turbine, complex terrain, Perdigão
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 14:01
Last Modified:02 May 2019 14:13

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