Shooting into the Wind with Laser Beams

Abstract

Lidar (light detection and ranging) systems are becoming increasingly important in the recording of wind conditions, especially offshore. The lidar instruments scan the wind flow with laser beams that can hit even the smallest of particles, and their reflection makes it possible to deduce the wind speed. Robust lidar instruments that are suitable for industrial use were developed in both projects. They can record the incoming wind much faster, more accurately and over a greater area than conventional met masts (measuring towers). And the wind flow field behind a turbine – the wake – has a considerable impact on the wind turbines downwind. Simulation models can reconstruct the wake very well, but require further development. Modern control systems only react once the wind has reached the turbine – and the load on the rotor blades and other components has already come into being. A lidar-supported feed forward control has been developed that can reduce these loads significantly