Validation of 3D sonic-anemometer against cup anemometer response

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    Determination and validation of wind turbine power curves traditionally rely on single point wind speed measurements recorded with a calibrated cup-anemometer. The power curve verification process, which is typically performed in different terrain types, does not always result in satisfactory agreement between measures- and predicted power curves. The observed disagreement is premarily believed to relate to the cup-anemometers being sensitive to tilted flow i.e. that the measurement of the horizontal flow component is sensible to flow in a plane perpendicular to the horizontal plane. Furthermore, the limited cup-anemometer response due to high turbulence can explain some of the diviations. The present paper investigates this problem, by analysing full-scale time series data extracted from "Database on Wind Characteristics" (, which represents a wide range of sites. Basically, tha sampled time series from a 3-D sonic-anemometer are compared with time series recorded by a nearby placed cup-anemometer. The comparison encompasses both wind speeds and the turbulence intensities. Subsequently, the observed diviations in the measured horizontal flow are correleated to the measured vertical flow. Keywords: cup-anemometer, sonic-anemometer, power curve, statistical analysis, turbulence
    Original languageEnglish
    Title of host publicationProceedings of the special Topic Conference: The Science of making Torque from Wind
    EditorsG.A.M. van Kuik
    Place of PublicationDelft
    PublisherDelft University of Technology
    Publication date2004
    ISBN (Print)90-76468-10-9
    Publication statusPublished - 2004
    EventSpecial topic conference: The science of making torque from wind - Delft, Netherlands
    Duration: 19 Apr 200421 Apr 2004


    ConferenceSpecial topic conference: The science of making torque from wind


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