Aufsatz
Improving Vertical Wind Speed Extrapolation Using Short-Term Lidar Measurements
Abstract
This study investigates how short-term lidar measurements can be used in combination with a mast measurement to improve vertical extrapolation of wind speed. Several methods are developed and analyzed for their performance in estimating the mean wind speed, the wind speed distribution, and the energy yield of an idealized wind turbine at the target height of the extrapolation. These methods range from directly using the wind shear of the short-term measurement to a classification approach based on commonly available environmental parameters using linear regression. The extrapolation strategies are assessed using data of ten wind profiles up to 200 m measured at different sites in Germany. Different mast heights and extrapolation distances are investigated. The results show that, using an appropriate extrapolation strategy, even a very short-term lidar measurement can significantly reduce the uncertainty in the vertical extrapolation of wind speed. This observation was made for short as well as for very large extrapolation distances. Among the investigated methods, the linear regression approach yielded better results than the other methods. Integrating environmental variables into the extrapolation procedure further increased the performance of the linear regression approach. Overall, the extrapolation error in (theoretical) energy yield was decreased by around 50% to 70% on average for a lidar measurement of approximately one to two months depending on the extrapolation height and distance. The analysis of seasonal patterns revealed that appropriate extrapolation strategies can also significantly reduce the seasonal bias that is connected to the season during which the short-term measurement is performed.
Citation
In: Remote sensing Volume 12 / Issue 7 (2020-03-29) , S. 1091 ; ISSN 2072-4292Sponsorship
Gefördert durch den Publikationsfonds der Universität KasselCitation
@article{doi:10.17170/kobra-202004021131,
author={Basse, Alexander and Pauscher, Lukas and Callies, Doron},
title={Improving Vertical Wind Speed Extrapolation Using Short-Term Lidar Measurements},
journal={Remote sensing},
year={2020}
}
0500 Oax 0501 Text $btxt$2rdacontent 0502 Computermedien $bc$2rdacarrier 1100 2020$n2020 1500 1/eng 2050 ##0##http://hdl.handle.net/123456789/11512 3000 Basse, Alexander 3010 Pauscher, Lukas 3010 Callies, Doron 4000 Improving Vertical Wind Speed Extrapolation Using Short-Term Lidar Measurements / Basse, Alexander 4030 4060 Online-Ressource 4085 ##0##=u http://nbn-resolving.de/http://hdl.handle.net/123456789/11512=x R 4204 \$dAufsatz 4170 7136 ##0##http://hdl.handle.net/123456789/11512
2020-04-15T12:17:43Z 2020-04-15T12:17:43Z 2020-03-29 doi:10.17170/kobra-202004021131 http://hdl.handle.net/123456789/11512 Gefördert durch den Publikationsfonds der Universität Kassel eng Namensnennung - Weitergabe unter gleichen Bedingungen 4.0 International http://creativecommons.org/licenses/by-sa/4.0/ lidar vertical extrapolation wind profile power law wind resource assessment 620 Improving Vertical Wind Speed Extrapolation Using Short-Term Lidar Measurements Aufsatz This study investigates how short-term lidar measurements can be used in combination with a mast measurement to improve vertical extrapolation of wind speed. Several methods are developed and analyzed for their performance in estimating the mean wind speed, the wind speed distribution, and the energy yield of an idealized wind turbine at the target height of the extrapolation. These methods range from directly using the wind shear of the short-term measurement to a classification approach based on commonly available environmental parameters using linear regression. The extrapolation strategies are assessed using data of ten wind profiles up to 200 m measured at different sites in Germany. Different mast heights and extrapolation distances are investigated. The results show that, using an appropriate extrapolation strategy, even a very short-term lidar measurement can significantly reduce the uncertainty in the vertical extrapolation of wind speed. This observation was made for short as well as for very large extrapolation distances. Among the investigated methods, the linear regression approach yielded better results than the other methods. Integrating environmental variables into the extrapolation procedure further increased the performance of the linear regression approach. Overall, the extrapolation error in (theoretical) energy yield was decreased by around 50% to 70% on average for a lidar measurement of approximately one to two months depending on the extrapolation height and distance. The analysis of seasonal patterns revealed that appropriate extrapolation strategies can also significantly reduce the seasonal bias that is connected to the season during which the short-term measurement is performed. open access Basse, Alexander Pauscher, Lukas Callies, Doron doi:10.3390/rs12071091 publishedVersion ISSN 2072-4292 Issue 7 Remote sensing 1091 Volume 12 false
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