Measurement uncertainty caused by distance errors during in situ tests of wind turbines

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dc.identifier.uri Reschka, Cornelia Koj, Sebastian Fisahn, Sven Garbe, Heyno 2019-12-11T16:12:42Z 2019-12-11T16:12:42Z 2019
dc.identifier.citation Reschka, C.; Koj, S.; Fisahn, S.; Garbe, H.: Measurement uncertainty caused by distance errors during in situ tests of wind turbines. In: Advances in Radio Science 17 (2019), S. 19-25. DOI:
dc.description.abstract During the assessment of the electromagnetic emissions of wind turbines (WTs), the aspects of measurement uncertainty must be taken into account. Therefore, this work focuses on the measurement uncertainty which arises through distance errors of the measuring positions around a WT. The measurement distance given by the corresponding standard is 30 m with respect to the WT tower. However, this determined distance will always differ e.g. due to unevenness of the surrounding ground, leading to measurement uncertainties. These uncertainties can be estimated with the knowledge of the electromagnetic field distribution. It is assumed in standard measurements, that the electromagnetic field present is a pure transversal electromagnetic field (far field). Simulations of a simplified WT model with a hub height of 100 m shows that this assumption is not effective for the whole frequency range from 150 kHz to 1 GHz. For frequencies below 3 MHz the field distribution is monotonically decreasing with the distance from the WT since it behaves like an electrical small radiator. Whereas for frequencies above 3 MHz, where the investigated model forms an electrical large radiator, the field distribution becomes more complex and the measurement uncertainty of the field strength at the observation point increases. Therefore, this work focuses on investigations where the near field becomes a far field. Based on the simulation results, a method for minimizing the uncertainty contribution caused by distance errors is presented. Therefore, advanced measurement uncertainty during in situ test of WTs can be reduced. eng
dc.language.iso eng
dc.publisher Göttingen : Copernicus
dc.relation.ispartofseries Advances in Radio Science 17 (2019)
dc.rights CC BY 4.0 Unported
dc.subject Electromagnetic fields eng
dc.subject Errors eng
dc.subject Radiators eng
dc.subject Wind turbines eng
dc.subject Electromagnetic emissions eng
dc.subject Electromagnetic field distribution eng
dc.subject Field distribution eng
dc.subject Frequency ranges eng
dc.subject Measurement uncertainty eng
dc.subject Observation point eng
dc.subject Standard measurements eng
dc.subject Uncertainty contributions eng
dc.subject.ddc 620 | Ingenieurwissenschaften und Maschinenbau ger
dc.title Measurement uncertainty caused by distance errors during in situ tests of wind turbines
dc.type Article
dc.type Text
dc.relation.issn 16849965
dc.bibliographicCitation.volume 17
dc.bibliographicCitation.firstPage 19
dc.bibliographicCitation.lastPage 25
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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