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Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
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Discussion papers
https://doi.org/10.5194/wes-2019-24
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/wes-2019-24
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research articles 16 May 2019

Submitted as: research articles | 16 May 2019

Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Wind Energy Science (WES).

Wind turbine load dynamics in the context of turbulence intermittency

Carl Michael Schwarz1, Sebastian Ehrich1, and Joachim Peinke1,2 Carl Michael Schwarz et al.
  • 1ForWind, Institute of Physics, Carl-von-Ossietzky University Oldenburg, Küpkersweg 70, 26129 Oldenburg, Germany
  • 2Fraunhofer Institute for Wind Energy Systems, Küpkersweg 70, 26129 Oldenburg, Germany

Abstract. The importance of a high order statistical feature of wind, which is neglected in common wind models, is investigated: Non-Gaussian distributed wind velocity increments related to the intermittency of turbulence and their impact on wind turbines dynamics and fatigue loads are in the focus. Two types of synthetic wind fields obtained from a Continuous-Time-Random Walk model are compared and fed to a common Blade-Element/Momentum theory based aero-servo-elastic wind turbine model. It is discussed why and how the effect of the non-Gaussian increment statistics has to be isolated. This is achieved by assuring that both types feature equivalent probability density functions, spectral properties and coherence, which makes them indistinguishable based on wind characterizations of common design guidelines. Due to limitations in the wind field genesis idealized spatial correlations are considered. Three examples with idealized, differently sized wind structures are presented. A comparison between the resulting wind turbine loads is made. For the largest wind structure sizes differences in the fatigue loads between intermittent and Gaussian are observed. These are potentially relevant in a wind turbine certification context. Subsequently, the dependency of this intermittency effect on the field's spatial variation is discussed. Towards very small structured fields the effect vanishes.

Carl Michael Schwarz et al.
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Status: final response (author comments only)
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Carl Michael Schwarz et al.
Carl Michael Schwarz et al.
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Latest update: 20 Aug 2019
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Short summary
This work is dedicated to the non-Gaussian statistics of wind velocity jumps and their effect on wind turbines, more specifically on fatigue loads. Wind velocity jumps are commonly simplified to be Gaussian behaved. This study discusses how to compare non-Gaussian to Gaussian wind fields properly, shows that the non-Gaussianity in fact can make a difference with respect to fatigue loads. Additionally we highlight the dependence of our findings on the wind field's coherence.
This work is dedicated to the non-Gaussian statistics of wind velocity jumps and their effect on...
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