LIDAR Supplement

LIDAR SUPPLEMENT 07

height, 2.3 MW Vestas NM80 turbine (Mikkelsen et al.6

). This, the first wind lidar integrated in a

rotating spinner, provided us with unimpeded views and detailed measurements of the approaching wind fields from 100m distance in front of the rotor plane. Several wind lidars for turbine mounting

have recently emerged, including, among others: ‘ControlZephIR’ (Natural Power); ‘Vindicator’ (Catch the Wind, Ltd.) and ‘Wind Iris’ (AventLidar Technology).

2D Upwind scanning spinner-integrated lidar for control In collaboration with Natural Power (UK) and IPU (DK), Risø DTU is currently engaged in designing and constructing a first 2D ‘cone-filling’ upwind scanning wind lidar. This instrument is intended for forecasting of entire rotor plane wind fields, to be combined with enhanced feed-forward control. The new 2D ‘cone-filling’ spinner lidar is realised by combining a standard conically-

In collaboration with Dong Energy, LM Wind

Power (DK), Natural Power (UK), NKT photonics DK, IPU (DK) and Risø DTU, the new 2D spinner lidar will be tested again in the 2.3 MW NM80 turbine situated at Tjæreborg Enge, as part of an ongoing Danish National Advanced Technology Foundation (DNATF) supported project: Integration of Wind LIDARs in Wind Turbines for Improved Productivity and Control8

. References

1. Bradley S. and Mikkelsen T. SODAR Remote Sensing. International Sustainable Energy Review, Volume 5, Issue 2, June 2011, pp 38-41

2. Wagner R., Courtney M., Gottschall J., Lindelöw–Marsden P. Accounting for the wind speed shear in wind turbine power performance measurement.(Submitted to Wind Energy).

3. Wagner R., Mikkelsen T., Courtney M. Investigation of turbulence measurements with a continuous wave, conically scanning LiDAR, EWEC 2009, Marseille, France.

4. Sathe A., Mann J., Gottschall J., Courtney M.S. Estimating the systematic errors in turbulence sensed by wind LIDARs. (Submitted to JTECH).

5. Harris M., D .J. Bryce, A. S. Coffey, D. A. Smith, J. Birkemeyer, U. Knopf, “Advance measurement of gusts by laser anemometry”, J Wind Eng. 95, 1637-1647 (2007).

6. Mikkelsen, T., Hansen, K. H., Angelou, N., Sjöholm, M. , Harris, M. , Hadley, P., Scullion, R., Ellis, G., Vives, G., Lidar wind speed measurements from a rotating spinner In: EWEC 2010 online Proceedings, 8 pp, 2010 European Wind Energy Conference and Exhibition, 2010, Warsaw (PL), 20-23 Apr, 2010.

7. Wagner, R. , Friis Pedersen, T. , Courtney, M. , Gottschall, J. , Antoniou, I. , Møller, R. , Markilde Pedersen, S. , Velociter, T. , Bardon, M. , Le, N., Mouritzen, A.S., Power performance measured using a nacelle lidar . In: EWEA Proceedings 2011 from EWEA Annual Event 2011, Brussels (BE), 14-17 Mar 2011.

(Top left) 2D upwind spinner lidar for spinner integration build from a standard conically scanning Control ZephIR equipped with a RISO DTU 2D scan head

(Top right and bottom left) Prototype spinner lidar testing in Dong Energy’s NM80 test turbine at Tjæreborg Enge 2009

(Bottom right) Visualisation of a cone-filling scan pattern probing the wind field in front of the rotor plane. Shown also are three small lidar telescopes integrated into the turbine blades and fed via optical fibers from a ControlZephIR installed in the rotating spinner.

At the Risø DTU Test Centre for Large Wind

Turbines (Høvsøre), power curve performance measurements have been performed on turbine-mounted lidars. For instance, in 2011 it was demonstrated that power curves based on a turbine-mounted prototype of the ‘Wind Iris’ lidar exhibited less scatter than power curves based on a standard met-mast, Wagner et al. 20117

. The challenge now for researchers,

engineers and manufacturers working with remote sensing for wind energy, is to show, in traceable scientific experiments, that wind turbines actually can make practical use of upwind looking lidars for power curve measurements and for improving control strategies, and to optimise performance and minimise the loads.

www.internationalsustainableenergy.com

scanning ControlZephIR, based on a ZephIR 300 with different system software and mechanical housing configurations to allow the unit to be either spinner or nacelle mounted. This spinner lidar is equipped with a fixed

cone-filling scan pattern version of the scan head earlier developed for the short-range WindScanners at Risø DTU, cf. the blue topand the cone-filling scan pattern.

Stuart Bradley is a professor of physics and Head of Physics at the University of Auckland, New Zealand. He was previously Professor of Acoustics at the Acoustics Research Center, University of Salford, UK.

Stuart has a wide background in

ground-based remote sensing, including within a number of EU programs, and consulting with industry (particularly on design of SODARs). His research encompasses complex terrain wind flow, Antarctic boundary layer studies, and urban boundary layers.

International Sustainable Energy Review Volume 5, Issue 3, 2011

» Several wind lidars for turbine mounting have recently emerged, including, among others: ‘ControlZephIR’ (Natural Power); ‘Vindicator’ (Catch the Wind, Ltd.) and ‘Wind Iris’ (AventLidar Technology) «

8. The Danish National Advanced Technology Foundation’s (DNATF) project: HTF nr.049-2009-3- Integration of wind lidars in wind turbines for improved productivity and control.

Torben Mikkelsen is professor in remote sensing for wind energy. He is affiliated with the wind energy division at Risø National Laboratory for Sustainable Energy, Technical University of Denmark (DTU).

His background includes a BSc in electronic engineering, a MSc in

electro-physics and a PhD in atmospheric turbulence and diffusion. He has been appointed professor at DTU in remote sensing for wind energy (May 1, 2011) and is now heading research activities at Risø DTU regarding wind energy related remote sensing activities, www.WindScanner.dk. He is also coordinating the research activities within a forthcoming EU ESFRI Road Map research infrastructure: The European WindScanner Facility, www.windscanner.eu.

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