1. Lidars Lifted: The Østerild Balconies Experiment
Jakob Mann

2. Observations lead the way
Inflow measurements from Doppler lidar give temporal and spatial information about wind field behaviour upstream of the turbine
Some uses:
Predictive turbine/farm control (yaw position, active power)
Very short term energy production forecasts (dispatch, grid balancing)
Extreme load avoidance (gusts, veer/shear)
Blade impact erosion (hail, birds, heavy rain) 2

3. Experiment Overview Scientific questions:
Are horizontal wind field gradients homogeneous?
Can we measure and characterise terrain effects?
Can we do anything meaningful with the inflow data?
Horizontal scanning at 2 heights
Phase 1: 50m AGL
Phase 2: 200m AGL
4.25km distance between scanners
Patchy forested terrain
730ft) 3

4. Site description: Terrain + tree height (m)4

5. Lifting procedure https://www.youtube.com/watch?v=ZnkCuZG22YU 5
Do you even lift? 5

6. Scan trajectory overview
(Leosphere WindCube)
90 degree synchronised PPI scans
2 degrees/LOS, 1s acquisition time
Zero position reset (non-reversing)
7 km maximum LOS range
Range gates at 35m intervals 6

7. Dual Doppler transect line
Points on transect line are synchronised in time (not exactly in space)
Sampling rate = 49s (0.02 Hz) 7

8. Introduction to plots PPI videos CNR filter (>-27 dB)
Red = negative (away from scanner)
Transect plots
Filtering
dt_delta (time drift between scanners) < 5 seconds
CNR (both scanners) >-27 dB
Wind direction from ° (Westerly)
Point #0 is closest to scanner, #28 furthest (6.2km linear distance from point #0) 8

9. Westerly gust (phase 2) Gust is detected 10 minutes upstream
(4 → 11 m/s, cut in to rated power) 9

10. Frontal boundary pass through (phase 1)10

11. Dual Doppler reconstruction of frontal event11

12. Mast data of event (June 6, 2016, 7PM CEST, UTC+2)12

13. Conclusions 400S EDFA gave consistant 7km range
PPI scaning is probably enough for determining upstream conditions on 10 min scales
Upstream measurements do give useful information!
Gust captured and tracked towards the ”turbine” over 10 mins
passing through a turbine’s rotor area
Thanks everyone ;)
Elliot Simon 13