van Dooren, Marijn Floris and Trabucchi, Davide and Kühn, Martin (2016) A methodology for the reconstruction of 2D horizontal wind fields of wind turbine wakes based on dual-Doppler lidar measurements. Remote sensing, 8 (10). p. 809. ISSN 2072-4292

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Abstract

Dual-Doppler lidar is a powerful remote sensing technique that can accurately measure horizontal wind speeds and enable the reconstruction of two-dimensional wind fields based on measurements from two separate lidars. Previous research has provided a framework of dual-Doppler algorithms for processing both radar and lidar measurements, but their application to wake measurements has not been addressed in detail yet. The objective of this paper is to reconstruct two-dimensional wind fields of wind turbine wakes and assess the performance of dual-Doppler lidar scanning strategies, using the newly developed Multiple-Lidar Wind Field Evaluation Algorithm (MuLiWEA). This processes non-synchronous dual-Doppler lidar measurements and solves the horizontal wind field with a set of linear equations, also considering the mass continuity equation. MuLiWEA was applied on simulated measurements of a simulated wind turbine wake, with two typical dual-Doppler lidar measurement scenarios. The results showed inaccuracies caused by the inhomogeneous spatial distribution of the measurements in all directions, related to the ground-based scanning of a wind field at wind turbine hub height. Additionally, MuLiWEA was applied on a real dual-Doppler lidar measurement scenario in the German offshore wind farm “alpha ventus”. It was concluded that the performance of both simulated and real lidar measurement scenarios in combination with MuLiWEA is promising. Although the accuracy of the reconstructed wind fields is compromised by the practical limitations of an offshore dual-Doppler lidar measurement setup, the performance shows sufficient accuracy to serve as a basis for 10 min average steady wake model validation.

Item Type:	Article
Additional Information:	Publiziert mit Hilfe des DFG-geförderten Open Access-Publikationsfonds der Carl von Ossietzky Universität Oldenburg.
Uncontrolled Keywords:	long-range scanning lidar, plan position indicator (PPI), wind field reconstruction, wake measurement
Subjects:	Science and mathematics > Physics Technology, medicine, applied sciences > Civil engineering and environmental protection engineering
Divisions:	Faculty of Mathematics and Science > Institute of Physics (IfP)
Date Deposited:	19 Sep 2017 10:14
Last Modified:	20 Dec 2017 11:07
URI:	https://oops.uni-oldenburg.de/id/eprint/3246
URN:	urn:nbn:de:gbv:715-oops-33275
DOI:	doi:10.3390/rs8100809
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