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Title:
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SODAR for site calibration?
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Author(s):
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Published by:
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Publication date:
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ECN
Wind Energy
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1-3-2002
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ECN report number:
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Document type:
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ECN-RX--02-010
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Conference Paper
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Number of pages:
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Full text:
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10
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Download PDF
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Presented at: Wind Power - Planning and Realisation Conference, Gdansk, Poland, 21-22 maart 2002.
Abstract:
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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