The use of lidar for wind turbine control relies on the hypothesis that the wind coherence in the longitudinal direction is sufficient to derive useful information from wind measurements at upstream locations. We examined wind coherence using measurements of longitudinal wind speed obtained using a forward facing pulsed turbine mounted lidar over three sites. The effect of different atmospheric conditions was evaluated. We found that the coherence decay parameter increases together with turbulence intensity, while the parameter defining the coherence at 0Hz increases with integral length-scale. A correction was applied for artificial coherence decrease due to lidar measurement effects. Results display encouraging similarities with a computational study carried out based on Large Eddy Simulation.
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - 2016|
|Event||Science of Making Torque from Wind, TORQUE 2016 - Munich, Germany|
Duration: 5 Oct 2016 → 7 Oct 2016