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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-2020-80
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/wes-2020-80
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 02 Jun 2020

Submitted as: research article | 02 Jun 2020

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This preprint is currently under review for the journal WES.

Field experiment for open-loop yaw-based wake steering at a commercial onshore wind farm in Italy

Bart M. Doekemeijer1, Stefan Kern2, Sivateja Maturu2,4, Stoyan Kanev3, Bastian Salbert4, Johannes Schreiber4, Filippo Campagnolo4, Carlo L. Bottasso4, Simone Schuler2, Friedrich Wilts5, Thomas Neumann5, Giancarlo Potenza6, Fabio Calabretta6, Federico Fioretti6, and Jan-Willem van Wingerden1 Bart M. Doekemeijer et al.
  • 1Delft Center for Systems and Control, Delft University of Technology, Delft, The Netherlands
  • 2GE Renewable Energy, D-85748 Garching bei München, Germany
  • 3TNO, Energy Transition, Westerduinweg 3, 1755 LE, Petten, The Netherlands
  • 4Wind Energy Institute, Technische Universität München, 85748 Garching, Germany
  • 5UL International GmbH – DEWI, Ebertstrasse 96, Wilhelmshaven, Germany
  • 6ENEL Green Power, Viale Regina Margherita 125, Rome, Italy

Abstract. The concept of wake steering in wind farms for power maximization has gained significant popularity over the last decade. Recent field trials described in the literature demonstrate the real potential of wake steering on commercial wind farms, but also show that wake steering does not yet consistently lead to an increase in energy production for all inflow conditions. Moreover, a recent survey among experts shows that validation of the concept remains the largest barrier for adoption currently. In response, this article presents the results of a field experiment investigating wake steering in three-turbine arrays at an onshore wind farm in Italy. This experiment was performed as part of the European CL-Windcon project. The measurements show increases in power production of up to 35 % for two-turbine interactions and up to 16 % for three-turbine interactions. However, losses in power production are seen for various regions of wind directions too. In addition to the gains achieved through wake steering at downstream turbines, more interesting to note is that a significant share in gains are from the upstream turbines, showing an increased power production of the yawed turbine itself compared to baseline operation for some wind directions. Furthermore, the surrogate model, while capturing the general trends of wake interaction, lacks the details necessary to accurately represent the measurements. This article supports the notion that further research is necessary, notably on the topics of wind farm modeling and experiment design, before wake steering will lead to consistent energy gains in commercial wind farms.

Bart M. Doekemeijer et al.

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Short summary
This article presents the results of a field experiment investigating wake steering in an onshore wind farm. The measurements show that wake steering leads to increases in power production of up to 35 % for two-turbine interactions and up to 16 % for three-turbine interactions. However, losses in power production are seen for various regions of wind directions too. The results suggest that further research is necessary before wake steering will consistently lead to energy gains in wind farms.
This article presents the results of a field experiment investigating wake steering in an...
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