Measurement of Wind Turbulence and Temperature Profiles
The Stuttgart Wind Energy chair – SWE – at the University of Stuttgart has at its disposal a number of instruments for the measurement of different wind parameters and the temperature of the near-ground atmosphere. The SWE's metrological equipment includes the following appliances and instruments:
Wind met mast
The SWE's three-sided wind met mast with a maximum height of 120 meters has multiple beams at various, freely selectable heights. Meteorological sensors (atmospheric pressure, temperature, humidity, rain) and wind sensors (cup anemometers, wind vanes, ultrasonic anemometers) can be mounted on these beams. In combination with the SWE data acquisition system the met mast's equipment allows the measurement of load and power performance curves of wind energy turbines according to IEC standards 61400-12 and 61400-13.
LiDAR - short range up to 250m
The SWE's short range LiDAR enables a simultaneous recording of horizontal wind speeds and wind directions at up to ten different heights between 40 and 250 meters above the ground. In flat terrain this type of wind measurement offers a good alternative to conventional wind met masts. Further research is required for the application of the LiDAR technique in forested areas and complex or mountainous terrains.
In combination with a SWE developed scanner , the LiDAR device can be employed on the nacelle of a wind turbine. By a certain systematic control of the laser beam the air flow can be observed and analyzed either in front of or behind the turbine covering the entire swept rotor area at various distances from the nacelle. The information about the approaching wind field for example is used for the development of predictive control strategies or future performance and load measurements. By observing a wind turbine's wake an estimation of the loads on neighboring wind turbines within a wind farm can be done.
LiDAR - long range up to 3000m
The SWE's long range LiDAR enables a simultaneous analysis of air currents at different distances of up to 3000 meters from its location. By variable scanning mechanics, measurements can be done within a hemispherical area around the device. As with the short range LiDAR-scanner, the laser beam can be steered in various, predefined directions.