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On the accuracy of a logarithmic Extrapolation of the wind Speed measured by horizontal lidar scans

Theuer, F. and Dooren, M. F. and von Bremen, L. and Kühn, M. (2020) On the accuracy of a logarithmic Extrapolation of the wind Speed measured by horizontal lidar scans. Journal of Physics: Conference Series (1618). Institute of Physics (IOP) Publishing. doi: 10.1088/1742-6596/1618/3/032043. ISSN 1742-6588.

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Official URL: https://iopscience.iop.org/article/10.1088/1742-6596/1618/3/032043

Abstract

Remote sensing-based wind power forecasts are nowadays being increasingly investigated. Long-range lidar scans are hereby often performed at low heights, causing the need for a wind speed extrapolation to hub height. In this work we analysed the accuracy of the stability corrected logarithmic wind profile and its sensitivity to atmospheric stability, wind speed and extrapolation height by means of a theoretical error estimation using error propagation. Emphasis was given to analyse the contributions of the profile's individual variables but also considering the measurement campaign framework. We further used lidar measurements at the offshore wind farm Global Tech I to support the theoretical analysis. The logarithmic profile was found to be able to describe profiles during most situations, however, decreasing wind speeds with height cannot be represented. Results showed that due to the nature of the stability correction term extrapolation errors are largest during very stable atmospheric conditions. Here, stability estimation errors were dominant. Under near neutral and neutral atmospheric conditions the wind speed error contributed most to the overall error. We conclude that extrapolation errors can mainly be reduced by optimising the estimation of atmospheric stability using accurate measurement devices. Furthermore, the precise horizontal alignment of the lidar device is important.

Item URL in elib:https://elib.dlr.de/139816/
Document Type:Article
Title:On the accuracy of a logarithmic Extrapolation of the wind Speed measured by horizontal lidar scans
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Theuer, F.ForWind-Zentrum für Windenergieforschung, Universität OldenburgUNSPECIFIEDUNSPECIFIED
Dooren, M. F.ForWind-Zentrum für Windenergieforschung, Universität OldenburgUNSPECIFIEDUNSPECIFIED
von Bremen, L.DLR Institut für Vernetzte EnergiesystemeUNSPECIFIEDUNSPECIFIED
Kühn, M.ForWind-Zentrum für Windenergieforschung, Universität OldenburgUNSPECIFIEDUNSPECIFIED
Date:21 September 2020
Journal or Publication Title:Journal of Physics: Conference Series
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
DOI:10.1088/1742-6596/1618/3/032043
Publisher:Institute of Physics (IOP) Publishing
Series Name:Future Wind/Measurement and Testing
ISSN:1742-6588
Status:Published
Keywords:Lidar, short-term forecasting, logarithmic wind profile
HGF - Research field:Energy
HGF - Program:Technology, Innovation and Society
HGF - Program Themes:Renewable Energy and Material Resources for Sustainable Futures - Integrating at Different Scales
DLR - Research area:Energy
DLR - Program:E SY - Energy Systems Analysis
DLR - Research theme (Project):E - Systems Analysis and Technology Assessment (old)
Location: Oldenburg
Institutes and Institutions:Institute of Networked Energy Systems > Energy Systems Analysis
Deposited By: von Bremen, Lüder
Deposited On:18 Dec 2020 13:48
Last Modified:14 Dec 2023 11:36

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