Wind field reconstruction from nacelle-mounted lidar short-range measurements
Profiling nacelle lidars probe the wind at several heights and several distances upstream of the rotor. The development of such lidar systems is relatively recent, and it is still unclear how to condense the lidar raw measurements into useful wind field characteristics such as speed, direction,...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2017-05-01
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| Series: | Wind Energy Science |
| Online Access: | https://www.wind-energ-sci.net/2/269/2017/wes-2-269-2017.pdf |
| Summary: | Profiling nacelle lidars probe the wind at several heights and several
distances upstream of the rotor. The development of such lidar systems is
relatively recent, and it is still unclear how to condense the lidar raw
measurements into useful wind field characteristics such as speed, direction,
vertical and longitudinal gradients (wind shear). In this paper, we
demonstrate an innovative method to estimate wind field characteristics using
nacelle lidar measurements taken within the induction zone. Model-fitting
wind field reconstruction techniques are applied to nacelle lidar
measurements taken at multiple distances close to the rotor, where a wind
model is combined with a simple induction model. The method allows robust
determination of free-stream wind characteristics. The method was applied to
experimental data obtained with two different types of nacelle lidar
(five-beam Demonstrator and ZephIR Dual Mode). The reconstructed wind speed
was within 0.5 % of the wind speed measured with a mast-top-mounted cup
anemometer at 2.5 rotor diameters upstream of the turbine. The technique
described in this paper overcomes measurement range limitations of the
currently available nacelle lidar technology. |
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| ISSN: | 2366-7443 2366-7451 |