Tjæreborg experiment

he lidar is integrated in the tip of the rotating spinner   Concept of measuring the upwind inflow conditions from a lidar integrated in the tip of a rotating spinner.
During the 2009 Lidar-in-Spinner-Experiment, where wind turbine measurement activity were performed jointly with the DAN-AERO project, a fast data acquisition continuous wave (cw) wind lidar (ZephIR) was installed and operated in the rotating spinner of a large 80 m Ø, 59 m hub height wind turbine (Vestas NM80) located at Tjæreborg Enge in western Denmark. In collaboration with Natural Power, we achieved, to the best of our knowledge, a “World first” successful operation of a forward looking wind lidar integrated into the spinner of an operating wind turbine.
The spinner integrated lidar concept allowed an unimpeded view of the approaching wind field, which has been interrogated using several different scan patterns. Information on instant wind speed, shear and direction veer can be extracted and was compared to the output from an adjacent Met-mast (Mikkelsen_et_al., 2010).

Lidar in spinner: experimental setup

The lidar is integrated in the tip of the rotating spinner and aligned with the turbine shaft axis. On-line real-time data access and lidar control was enabled via wireless telecommunication; cf. the white antenna in the figure below.


  The cw lidar installed on the turbine axis
in the tip of the NM80 spinner. The lidar
measures the approaching wind conditions
by conical scanning with the laser beam
through the window. Also seen are the three blue
pitch control motors