ECN publication
SODAR for site calibration?
Published by: Publication date:
ECN Wind Energy 1-3-2002
ECN report number: Document type:
ECN-RX--02-010 Conference Paper
Number of pages: Full text:
10 Download PDF  

Presented at: Wind Power - Planning and Realisation Conference, Gdansk, Poland, 21-22 maart 2002.

An attempt has been made to carry out a site calibration in flat terrainwith a Mini-SODAR (using two models) and a met tower, according to IEC 61400-12 and MEASNET power performance criteria. Our main conclusions are that Mini-SODAR is, as yet, not "plug and play" equipment and that expertise is needed for good quality data. Also a comparison with a met tower is highly recommended before using a new SODAR for field measurements. Even though the terrain was flat the resulting correction factors where as large as 17% where as in complex terrain the correction factors are a few percent. The best data showed about 2% difference in wind speed (3000 model) and the worst around 20% difference (4000 model). The maximum altitudes of both models where hardly ever reached. The advantage of the 3000 model is that it measures higher than the 4000 model with a much better accuracy. Due to the MEASNET requirements for site calibration the measurement sector decreased with 50% and only 5-degree sectors were used in the site calibration. The accuracy of the measurements depended strongly on the altitude of the measurement and the settings used.

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