1. WINDSCANNER.DK: LIDAR WIND SPEED MEASUREMENTS FROM A ROTATING SPINNER
T. Mikkelsen, K. Hansen, N. Angelou, M. Sjöholm, M. Harris, P. Hadley, R. Scullion, G. Ellis, G. Vives Risø DTU, Roskilde, Denmark Natural Power, Malvern, UK

2. WindScanner.dk From new Wind Lidar Technology towards new Wind Energy
Research Infrastructures…:
WindScanner.dk
Current Status
SpinnerEX 2009
EU ESFRI
Road Map
2010 ?
MusketeerEX 2007/2008
RI focus
First CW Wind lidar 2004
Scientific focus
Technical focus

3. WindScanner.dk methodology is based on 3-dimensional scanning with wind lidar's to determine the instantaneous turbulence fields:
Since 2005 new wind lidar's have enabled replacement of tall ( m) MET masts

5. 25 kW Wind Turbine 1975:
Ø/H ~ 0.3 Ø
2.3 MW NM80
Height 59 m;
Ø=80H
<Ø/H ~ 1.4 HH

6. Spinner Integrated Lidar I: Experimental Setup:
Pro-active wind turbine control from upwind measurements by lidars integrated in the rotating Spinner… :

7. Spinner – mounted lidar
CW Lidar: ZephIR (50 Hz)
Spinner – mounted lidar
Tjæreborg SPINNER-EX
2009
Wind Turbine: NM80
(NegMicon/Vestas)

8. Tjæreborg: ZephIR “Spinner-Ex.” …:

11. Real-time LIDAR Raw data (50 Hz un-calibrated):

12. Ex.: Inhomogeneous wind field
Time series (10 s) of approaching wind conditions measured +100 m upwind:
Ex.: Inhomogeneous wind field 12

13. Spinner Integrated Lidar II: Measurements and Results
Pro-active wind turbine control from upwind measurements by lidar's integrated in the rotating Spinner… :

14. Measurement Setup’s: Period Wedge Distance April – May 2009 15o ~1.24Ø
July – August 2009
30o
~0.58Ø
Wind speed values per rotation
(each frame contains 10 consecutive
scanning circles)

15. Upwind @ 1.24 Ø (+ 100 m): Radial wind speeds
during a 10-min sampling period
The loci of the focussed lidar beam

16. Geometry Radial Wind Speeds – Wind Turbine-referenced:
Horizontal Wind Speeds –ground-referenced:

29. Results Correlation between lidar and mast
Study of the approaching wind field

30. Wind turbine Yaw-misalignment relative to
time-averaged wind direction as measured by lidar:
Direction [degrees]
Time [HH:MM]
Yaw misalignment angles at hub height (57m)
Θw [degrees]
Time [sec]

31. Power curve measurements based on Spinner Lidar data:
10-min averages
1-min averages
1-s averages
Power [kW]
U [m/s]
U [m/s]
U [m/s]
U [m/s]
Power curves from lidar wind speed 100 m (1.24 Ø) upwind
Power [kW]
U [m/s]
U [m/s]
U [m/s]
Power curves based on hub-height cup anemometer

32. Spinner Integrated Lidar III: Future Work 2D Rotor Plane Scans
Pro-active wind turbine control from upwind measurements by lidars integrated in the rotating Spinner… : 32

33. Dual-prism single-axis beam steering:
Scanning in 2-D:
”Risley prism”
Dual-prism single-axis beam steering:

34. Scope for further wind LIDAR integration:
Rotor Plane
Upwind
Blade integrated lidar
Spinner integrated lidar 34

35. Future research and applications:
More precise yaw alignment using lidar
Proactive (typically +10 s) Pitch control
Pro-active RPM control
Warning and mitigating of extreme loads (from gusts)
More percise power-curve measurememts …
Acknowledgements:
The Tjæreborg “Lidar-in-spinner Experiment” was conducted as part of the Windscanner.dk RI activities 2009.
Meteorology and turbine data have been provided via the Danish DAN-AERO MW project.
Access to the NM80 research Turbine was granted by Vestas and Dong Energy.