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Wind Shear Extremes at Possible Offshore Wind Turbine Locations

Wind Shear Extremes at Possible Offshore Wind Turbine Locations Positive and negative short-term extreme wind shear distributions (conditioned on the mean wind speed) are determined and compared for a number of offshore sites. The analysis is based on rapidly sampled field measurements (1–8 Hz) extracted from the “Database on Wind Characteristics” (www.winddata.com).Three different averaging periods (2, 5 and 10 seconds) are considered, and for each averaging period a relation between the resulting extreme shear distributions and the averaging time are presented. The short-term extreme shear analysis is based on different spatial distances, and extrapolation to a spatial distance of 100 m has been investigated. Such distances are appropriate for the next generation of offshore wind turbines.The paper concludes with an estimation of the short-term extreme shear values, which are compared to the values specified in the IEC-61400 code. The extreme IEC shear values seems to be rather conservative for an offshore location, compared to the estimated values based on measurements. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Wind Engineering SAGE

Wind Shear Extremes at Possible Offshore Wind Turbine Locations

Hansen, Kurt S.; Larsen, Gunner Chr.
Wind Engineering , Volume 27 (5): 11 – Sep 1, 2003
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References (5)

Publisher
SAGE
Copyright
© 2003 SAGE Publications
ISSN
0309-524X
eISSN
2048-402X
DOI
10.1260/030952403322770940
Publisher site
See Article on Publisher Site

Abstract

Positive and negative short-term extreme wind shear distributions (conditioned on the mean wind speed) are determined and compared for a number of offshore sites. The analysis is based on rapidly sampled field measurements (1–8 Hz) extracted from the “Database on Wind Characteristics” (www.winddata.com).Three different averaging periods (2, 5 and 10 seconds) are considered, and for each averaging period a relation between the resulting extreme shear distributions and the averaging time are presented. The short-term extreme shear analysis is based on different spatial distances, and extrapolation to a spatial distance of 100 m has been investigated. Such distances are appropriate for the next generation of offshore wind turbines.The paper concludes with an estimation of the short-term extreme shear values, which are compared to the values specified in the IEC-61400 code. The extreme IEC shear values seems to be rather conservative for an offshore location, compared to the estimated values based on measurements.

Journal

Wind Engineering – SAGE

Published: Sep 1, 2003

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