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Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
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This paper suggests that the impacts of different turbulence models should be considered as uncertainties while evaluating the benefits of LiDAR assisted control (LAC) in wind turbine design. The value creation of LAC, evaluated using the Kaimal turbulence model, will be diminished if the Mann turbulence model is used instead. In particular, the difference in coherence is more significant for larger rotors.
Preprints
https://doi.org/10.5194/wes-2021-51
https://doi.org/10.5194/wes-2021-51

  01 Jun 2021

01 Jun 2021

Review status: this preprint is currently under review for the journal WES.

On Turbulence Models and LiDAR Measurements for Wind Turbine Control

Liang Dong1, Wai Hou Lio1, and Eric Simley2 Liang Dong et al.
  • 1Department of Wind Energy, Technical University of Denmark (DTU), Frederiksborgvej 399, 4000, Roskilde, Denmark
  • 2National Renewable Energy Laboratory (NREL), 15013 Denver West Parkway, Golden, Colorado 80401, USA

Abstract. To provide comprehensive information that will assist in making decisions regarding the adoption of LiDAR assisted control (LAC) in wind turbine design, this paper investigates the impact of different turbulence models on the coherence between the rotor effective wind speed and LiDAR measurement. First, the differences between the Kaimal and Mann models are discussed, including the power spectrum and spatial coherence. Next, two types of LiDAR systems are examined to analyze the LiDAR measurement coherence based on commercially available LiDAR scan patterns. Finally, numerical simulations have been performed to compare the LiDAR measurement coherence for different rotor sizes. This work confirms the association between the measurement coherence and the turbulence model. The results indicate that the LiDAR measurement coherence with the Mann turbulence model is lower than that with the Kaimal turbulence model. In other words, the value creation of LAC, evaluated using the Kaimal turbulence model, will be diminished if the Mann turbulence model is used instead. In particular, the difference in coherence is more significant for larger rotors. As a result, this paper suggests that the impacts of different turbulence models should be considered as uncertainties while evaluating the benefits of LAC.

Liang Dong et al.

Status: open (until 17 Jul 2021)

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Liang Dong et al.

Liang Dong et al.

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Short summary
This paper suggests that the impacts of different turbulence models should be considered as uncertainties while evaluating the benefits of LiDAR assisted control (LAC) in wind turbine design. The value creation of LAC, evaluated using the Kaimal turbulence model, will be diminished if the Mann turbulence model is used instead. In particular, the difference in coherence is more significant for larger rotors.
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