1. Cost effective power performance testing with nacelle mounted Lidars
WWEC
13TH June 2017

2. Technology: Doppler Pulsed Lidar
Laser signal is emitted into the atmosphere and reflected by the particles
The frequency of the reflected signal is shifted due to Doppler effect
The shift is proportional to the speed of particles = wind speed
The Doppler Pulsed Lidar is able to measure at several distances instantaneously
Same technology base for all product range

3. Vertical profiler Lidar
Lidars measure wind flow in different ways
Windcube
Vertical profiler Lidar
Wind Iris
Turbine mounted Lidar
Windcube
Scanning Lidar
100s/200s/400s
Range: 40 to 290+ meters
Installed on the ground
Measures 12 heights
Designed for remote and standalone measurements
Range: 50 to 450+ meters
Installed on the turbine roof
Measures 10 distances
Range: up to 15 kilometers
Installed on the ground
Measures 100 distances
Designed for full field analysis

4. Wind measurement needs for each stage of a wind farm lifecycle
DEVELOPMENT
OPERATIONS & MAINTENANCE
REPOWERING /
RESELL
COMMISSIONING
Performance monitoring and optimization
Wind farm monitoring and forecast
Wind Ressource Asessment
Power performance testing
Wind assessment

5. Lidars in international standards
« Remote sensing technique like LIDAR […] have reached a stage, where they can be considered as supplement or as alternative to mast measurement in many case» Measnet, April 2016
Ground based Lidar is included in best practices and standards

6. Power performance testing with nacelle mounted Lidars

7. Wind Iris measures the upwind flow
TOP VIEW
SIDE VIEW
15.0° X Y Z
5.0°

8. Measurement principle
Shear, veer, wind speed, wind direction are measured

9. Wind Iris allows for power performance testing
Wind Iris is used as reference measurement in performance verification contract

10. Wind Iris allows for in depth power performance analysis
Impact of shear on performance is observed from Wind Iris measurements

11. Wind Iris calibration: each beam is compared to a mast
Wind Iris instead of 4 beam Wind Iris (la majorité de l’audience ne saura pas ce que c’est que le 2 beam, j’ai eu la liste ….)
Traceable to national standard calibration

12. A power performance testing campaign with Wind Iris

13. A simple terrain site in southern France
Turbine
Turbine 3MW, operated by EDF EN Services
Hub-height: 80 meters
Rotor size: 90 meters
IEC mast
Top cup at hub-height
240 meters (2.7D) from turbine
Free wind sector: [315°;335°]
Temperature above 0.1°

14. Wind Iris compared to an IEC compliant met mast
High accuracy and precision is observed

15. IEC equivalent performance testing is achieved within 33 days
Mast
Lidar
IEC PC
Not reached during the campaign
33 days
Ope. PC
58 days
8 days
Quick and Low uncertainty power performance testing

16. Conclusion
Nacelle mounted Lidar allows for quick and cost effective power performance testing, especially offshore
Shear and veer calculation for in-depth power performance analysis
Wind Iris is used by OEM and utilities for contractual power performance measurements

17. Thank you!
Paul Mazoyer