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Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
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https://doi.org/10.5194/wes-2019-39
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/wes-2019-39
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research articles 07 Aug 2019

Submitted as: research articles | 07 Aug 2019

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

Cluster wakes impact on a far distant offshore wind farm's power

Jörge Schneemann1, Andreas Rott1, Martin Dörenkämper2, Gerald Steinfeld1, and Martin Kühn1 Jörge Schneemann 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. Our aim with this paper was the analysis of the influence of offshore cluster wakes on the power of a far distant wind farm. We measured cluster wakes with long range Doppler light detection and ranging (lidar) and satellite synthetic aperture radar (SAR) in different atmospheric stabilities and analysed their impact on the 400 MW offshore wind farm "Global Tech I" in the German North Sea using supervisory control and data acquisition (SCADA) power data. Our results showed clear wind speed deficits that can be related to the wakes of wind farm clusters up to 55 km upstream in stable and weakly unstable stratified boundary layers resulting in a clear reduction in power production. We discussed the influence of cluster wakes on the power production of a far distant wind farm, cluster wake characteristics and methods for cluster wake monitoring. In conclusion, we proved the existence of wake shadowing effects with resulting power losses up to 55 km downstream and encouraged further investigations on far reaching wake shadowing effects for optimized areal planning and reduced uncertainties in offshore wind power resource assessment.

Jörge Schneemann et al.
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Short summary
Offshore wind farm clusters cause reduced wind speeds in downstream regions which can extend over more than 50 km. We analysed the impact of these so called cluster wakes on a distant wind farm using remote sensing wind measurements and power production data. Cluster wakes caused power losses up to 55 km downstream in certain atmospheric states. A better understanding of cluster wake effects reduces uncertainties in offshore wind resource assessment and improves offshore areal planning.
Offshore wind farm clusters cause reduced wind speeds in downstream regions which can extend...
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