Sensitivity analysis of nacelle lidar free stream wind speed measurements to wind-induction reconstruction model and lidar range configuration

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Abstract

The sensitivity of nacelle lidar wind speed measurements to wind-induction models and lidar range configurations is studied using experimental data from the Nørrekær Enge (NKE) measurement campaign and simulated lidar data from Reynold-Averaged Navier Stokes (RANS) aerodynamic computational fluid dynamics (CFD) simulations. In both approaches, the data correspond to measurements (or simulations) from a five-beam Demonstrator (5B-Demo) unit developed by Avent Lidar Technology and a ZephIR Dual-Mode (ZDM) unit developed by Zephir Lidar. The 5B-Demo was configured to measure at ten distances while the ZDM was configured to measure at five distances.

From the configured distances, a large number of range configurations were created and systematically tested to determine the sensitivity of the reconstructed wind speeds to the number of ranges, minimum range and maximum range in the
range configurations. The wind speeds were reconstructed using both a onedimensional and two-dimensional induction model to test the sensitivity towards the wind-induction model. In all cases, the sensitivity of the reconstructed wind
speed was determined from the wind speed error and root mean square error (RMSE) of the fitting residuals.

The results demonstrate that it is not possible to use RANS CFD simulated lidar data to determine optimal range configurations for real-time nacelle lidars due to their perfect (unrealistic) representation of the simulated flow field. The
recommended range configurations are therefore based on the NKE sensitivity analysis results. Based on these results, it is recommended to configure nacelle lidars to measure at approximately 3-5 ranges. The minimum distance should be
configured to roughly 0.5 rotor diameters (Drot) while it is recommended that the maximum range lay within 1-1.5Drot. In addition, the results show that the reconstructed wind speeds are insensitive to the wind-induction reconstruction
model.
Original languageEnglish
PublisherDTU Wind Energy
Number of pages84
Publication statusPublished - 2017
SeriesDTU Wind Energy E
Volume152

Cite this

@book{46ee25ab1022423ea40a797eed36af45,
title = "Sensitivity analysis of nacelle lidar free stream wind speed measurements to wind-induction reconstruction model and lidar range configuration",
abstract = "The sensitivity of nacelle lidar wind speed measurements to wind-induction models and lidar range configurations is studied using experimental data from the N{\o}rrek{\ae}r Enge (NKE) measurement campaign and simulated lidar data from Reynold-Averaged Navier Stokes (RANS) aerodynamic computational fluid dynamics (CFD) simulations. In both approaches, the data correspond to measurements (or simulations) from a five-beam Demonstrator (5B-Demo) unit developed by Avent Lidar Technology and a ZephIR Dual-Mode (ZDM) unit developed by Zephir Lidar. The 5B-Demo was configured to measure at ten distances while the ZDM was configured to measure at five distances. From the configured distances, a large number of range configurations were created and systematically tested to determine the sensitivity of the reconstructed wind speeds to the number of ranges, minimum range and maximum range in therange configurations. The wind speeds were reconstructed using both a onedimensional and two-dimensional induction model to test the sensitivity towards the wind-induction model. In all cases, the sensitivity of the reconstructed windspeed was determined from the wind speed error and root mean square error (RMSE) of the fitting residuals. The results demonstrate that it is not possible to use RANS CFD simulated lidar data to determine optimal range configurations for real-time nacelle lidars due to their perfect (unrealistic) representation of the simulated flow field. Therecommended range configurations are therefore based on the NKE sensitivity analysis results. Based on these results, it is recommended to configure nacelle lidars to measure at approximately 3-5 ranges. The minimum distance should beconfigured to roughly 0.5 rotor diameters (Drot) while it is recommended that the maximum range lay within 1-1.5Drot. In addition, the results show that the reconstructed wind speeds are insensitive to the wind-induction reconstructionmodel.",
author = "Elin Svensson and Antoine Borraccino and {Meyer Forsting}, {Alexander Raul} and Niels Troldborg and Rozenn Wagner",
year = "2017",
language = "English",
series = "DTU Wind Energy E",
publisher = "DTU Wind Energy",
address = "Denmark",

}

Sensitivity analysis of nacelle lidar free stream wind speed measurements to wind-induction reconstruction model and lidar range configuration. / Svensson, Elin; Borraccino, Antoine; Meyer Forsting, Alexander Raul; Troldborg, Niels; Wagner, Rozenn.

DTU Wind Energy, 2017. 84 p. (DTU Wind Energy E, Vol. 152).

Research output: Book/ReportReportResearchpeer-review

TY - RPRT

T1 - Sensitivity analysis of nacelle lidar free stream wind speed measurements to wind-induction reconstruction model and lidar range configuration

AU - Svensson, Elin

AU - Borraccino, Antoine

AU - Meyer Forsting, Alexander Raul

AU - Troldborg, Niels

AU - Wagner, Rozenn

PY - 2017

Y1 - 2017

N2 - The sensitivity of nacelle lidar wind speed measurements to wind-induction models and lidar range configurations is studied using experimental data from the Nørrekær Enge (NKE) measurement campaign and simulated lidar data from Reynold-Averaged Navier Stokes (RANS) aerodynamic computational fluid dynamics (CFD) simulations. In both approaches, the data correspond to measurements (or simulations) from a five-beam Demonstrator (5B-Demo) unit developed by Avent Lidar Technology and a ZephIR Dual-Mode (ZDM) unit developed by Zephir Lidar. The 5B-Demo was configured to measure at ten distances while the ZDM was configured to measure at five distances. From the configured distances, a large number of range configurations were created and systematically tested to determine the sensitivity of the reconstructed wind speeds to the number of ranges, minimum range and maximum range in therange configurations. The wind speeds were reconstructed using both a onedimensional and two-dimensional induction model to test the sensitivity towards the wind-induction model. In all cases, the sensitivity of the reconstructed windspeed was determined from the wind speed error and root mean square error (RMSE) of the fitting residuals. The results demonstrate that it is not possible to use RANS CFD simulated lidar data to determine optimal range configurations for real-time nacelle lidars due to their perfect (unrealistic) representation of the simulated flow field. Therecommended range configurations are therefore based on the NKE sensitivity analysis results. Based on these results, it is recommended to configure nacelle lidars to measure at approximately 3-5 ranges. The minimum distance should beconfigured to roughly 0.5 rotor diameters (Drot) while it is recommended that the maximum range lay within 1-1.5Drot. In addition, the results show that the reconstructed wind speeds are insensitive to the wind-induction reconstructionmodel.

AB - The sensitivity of nacelle lidar wind speed measurements to wind-induction models and lidar range configurations is studied using experimental data from the Nørrekær Enge (NKE) measurement campaign and simulated lidar data from Reynold-Averaged Navier Stokes (RANS) aerodynamic computational fluid dynamics (CFD) simulations. In both approaches, the data correspond to measurements (or simulations) from a five-beam Demonstrator (5B-Demo) unit developed by Avent Lidar Technology and a ZephIR Dual-Mode (ZDM) unit developed by Zephir Lidar. The 5B-Demo was configured to measure at ten distances while the ZDM was configured to measure at five distances. From the configured distances, a large number of range configurations were created and systematically tested to determine the sensitivity of the reconstructed wind speeds to the number of ranges, minimum range and maximum range in therange configurations. The wind speeds were reconstructed using both a onedimensional and two-dimensional induction model to test the sensitivity towards the wind-induction model. In all cases, the sensitivity of the reconstructed windspeed was determined from the wind speed error and root mean square error (RMSE) of the fitting residuals. The results demonstrate that it is not possible to use RANS CFD simulated lidar data to determine optimal range configurations for real-time nacelle lidars due to their perfect (unrealistic) representation of the simulated flow field. Therecommended range configurations are therefore based on the NKE sensitivity analysis results. Based on these results, it is recommended to configure nacelle lidars to measure at approximately 3-5 ranges. The minimum distance should beconfigured to roughly 0.5 rotor diameters (Drot) while it is recommended that the maximum range lay within 1-1.5Drot. In addition, the results show that the reconstructed wind speeds are insensitive to the wind-induction reconstructionmodel.

M3 - Report

T3 - DTU Wind Energy E

BT - Sensitivity analysis of nacelle lidar free stream wind speed measurements to wind-induction reconstruction model and lidar range configuration

PB - DTU Wind Energy

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