1. Overview of upcoming lidar wake experiments at DTU
IBL WiSH, Guillaume Lea
Overview of upcoming lidar wake experiments at DTU
Elliot Simon
DTU Wind Energy (RISØ)

2. Background
DTU has developed a series of lidar instruments which can be used for turbine wake measurements:
Long-range WindScanner
Short-range WindScanner
SpinnerLidar
Overview of upcoming lidar wake experiments at DTU

3. Three upcoming projects:
Wind Farm Control Trials (Elliot Simon,
TotalControl (Gunner Larsen,
Risø V52 Wake Study (Torben Larsen,
Selected completed work:
Sandia SWiFT wake experiment (Vestas V27)
SpinnerLidar with coupled LINCOM flow solver
Torben Mikkelsen
Perdigão 2015 and 2017 (Enercon E-82)
2D/3D wake measurements in complex terrain using LRWS
Nikola Vasiljevic
Overview of upcoming lidar wake experiments at DTU

4. Wind Farm Control Trials
Overall goal:
Demonstrate optimized farm-level operation using wake redirection strategies, and compare to simulation benchmarks (HAWC2, PossPow, Fuga, ECN FarmFlow)
Field experiment:
One year-long demonstration at a large offshore wind farm (regular layout) in the UK
Instrumentation: One scanning lidar (WindCube 400S), 8 x WindEYE 2-beam lidars, 2 x tower load strain gauges
Scanning lidar deployed on substation to scan PPIs near hub height for inflow (spd+dir), turbulence characterization, wake position & deflection
Overview of upcoming lidar wake experiments at DTU

5. TotalControl Overall goal: Two field campaigns:
Develop integrated turbine and farm level control schemes (loads and production) to optimize plant revenue by dynamically managing WTG set points with input from markets
Two field campaigns:
Scotland: Samsung 7MW test turbine
2 x SpinnerLidars (one forward, one rear facing)
Outcome: 3-component inflow and wake using coupled lidar-LINCOM method (linearized flow solver for mass and momentum)
Sweden: Lillgrund offshore wind farm
2 x long-range WindScanners mounted on WTG transition pieces
Outcome: Space & time synchronized dual-Doppler measurements of the wakes behind selected turbine rows
Overview of upcoming lidar wake experiments at DTU

6. Risø V52 Wake Study Overall goal: Field experiment:
Create a high resolution dataset for wake model validation and research
Field experiment:
2 month measurement campaign of DTU’s V52 research turbine at Risø
Instrumentation: 3 x new 6” SRWS, 2 x SpinnerLidars, LRWS, sterovision cameras, strain gauges
Outcome: Highly resolved flow field up and downstream of the turbine. Blade deformation from stereovision, tower loads, and SCADA
Overview of upcoming lidar wake experiments at DTU

7. Recommendations
Scan inflow as well as wake. Inflow measurements are very important for flow modelling
For 2D wake, measure as close to horizontal as possible
Include temperature measurements for stability classification
Hybrid pulsed/CW lidar setup is good for seeing near and far wake. Thorough calibration needed!
Use a turbine with small rotor, since CW lidar has limited measurement range and probe volume increases with distance
Get in touch if you’d like to discuss anything!
Overview of upcoming lidar wake experiments at DTU