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IEE anemometry

 

 

In Germany there is still a huge potential for further development of onshore wind power. New tower technology with heights around 150 m enables tapping wind resources over forests and in more complex terrain.

 

A major issue is the prevailing uncertainties about the wind conditions at these heights. This is particularly the case in more complex terrain such as hilly woodlands. The aim of the project ‘Windenergienutzung im Binnenland’ (Utilization of Inland Wind Power) is to analyze the wind characteristics at great hub heights over forested hills. Furthermore, the project seeks to test and improve lidar measurements in complex terrain and great hub heights as a new option to complement or eventually replace mast mounted wind measurements.

 

To reach the goals of the project a 200 m met mast will be installed on a hilly woodland site. The mast will be equipped with anemometers at ten different heights. Additionally the measurements of three lidar systems will be compared to that of sensors mounted on the met mast. The installation of the mast is scheduled for spring 2011. Until then, different measurement campaigns are carried out to test the lidar systems at several locations.

 

The first measurement campaign lasted from March to June 2010. During this time the pulsed lidars were installed close to Karlsruhe. The comparison of the lidars shows the consistency between the measurements of the lidar systems. One lidar was later placed next to a wind turbine in semi complex terrain to compare the measurements to the power output of the wind turbine. The comparison showed good results in general, but in some cases bigger outliers were observed, which are probably a result of site effects, which it is not possible to analyse in detail, since no site calibration was carried out.