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. The electromagnetic (EM) emissions of wind energyconversion systems (WECS) are evaluated in situ. Results of in situ tests,however, are only valid for the examined equipment under test (EUT) andcannot be applied to series production as samples, as the measurementuncertainty for in situ environment is not characterized. Currentlymeasurements must be performed on each WECS separately, this is associatedwith significant costs and time requirement to complete. Therefore, in thiswork, based on the standard procedure according to the “Guide to theExpression of Uncertainty” (GUM, 2008) the measurement uncertainty ischaracterized. From current normative situation obtained influences on themeasurement uncertainty: wind velocity and undefined ground are evaluated.The influence of increased wind velocity on the measurement uncertainty isevaluated with an analytical approach making use of the dipolecharacteristic. A numerically evaluated model provides information about theexpected uncertainty due to reflection on different textures and varyingvalues of relative ground moisture. Using a classical reflection law basedapproach, the simulation results are validated. Thanks to the presentedmethods, it is possible to successfully characterize the measurementuncertainty of in situ measurements of WECS's EM emissions.

Measurement Uncertainty of Radiated Electromagnetic Emissions in In Situ Tests of Wind Energy Conversion Systems