Journal article
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, w hich 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.
Language: | English |
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Publisher: | Multi-Science Publishing Company |
Year: | 2003 |
Pages: | 339-349 |
ISSN: | 2048402x and 0309524x |
Types: | Journal article |
DOI: | 10.1260/030952403322770940 |
ORCIDs: | Hansen, Kurt Schaldemose and Larsen, Gunner Chr. |