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) ellsim@dtu.dk

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

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

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

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

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

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