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Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
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In this study wake redirection and axial induction control are combined to mitigate turbine-wake interactions which have a negative impact on the performance and lifetime of wind farms. The result confirm in a realistic setting that substantial power gains are obtained when overinduction is combined with tilt control. More importantly, the approach is extended to the case of yaw control showing that large power gains enhancements are obtained by means of overinductive yaw control.
Preprints
https://doi.org/10.5194/wes-2020-111
https://doi.org/10.5194/wes-2020-111

  26 Oct 2020

26 Oct 2020

Review status: a revised version of this preprint was accepted for the journal WES and is expected to appear here in due course.

Wake redirection at higher axial induction

Carlo Cossu Carlo Cossu
  • Laboratoire d’Hydrodynamique Énergetique et Environnement Atmosphèrique (LHEEA) CNRS - Centrale Nantes, 1 rue de la Noë 44300 Nantes, France

Abstract. The energy produced by wind plants can be increased by mitigating the negative effects of turbine-wakes interactions. In this context, axial induction control and wake redirection, obtained by intentionally yawing or tilting the rotor axis away from the mean wind direction, have been the subject of extensive investigations. We have recently shown that the combination of static tilt control with static axial over-induction results in significant power gains. However, these early results were based on idealized turbine models where wake-rotation effects, radial force distributions and realistic turbine controller effects were neglected. In this study we therefore compute power gains that can be obtained by operating tilted rotors at higher axial induction for the more realistic native NREL 5-MW turbine model implemented in SOWFA. We then extend this approach to the case of yaw control. We show that power gains obtained by standard wake redirection based on yaw or tilt control are highly enhanced when the yawed or tilted turbines are operated at higher axial induction. These results confirm our early findings for the case of tilt control and extend them to the case of yaw control suggesting an high potential for the practical application of overinductive wake redirection.

Carlo Cossu

 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Carlo Cossu

Carlo Cossu

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Short summary
In this study wake redirection and axial induction control are combined to mitigate turbine-wake interactions which have a negative impact on the performance and lifetime of wind farms. The result confirm in a realistic setting that substantial power gains are obtained when overinduction is combined with tilt control. More importantly, the approach is extended to the case of yaw control showing that large power gains enhancements are obtained by means of overinductive yaw control.
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