On Turbulence Models and Lidar Measurements for Wind Turbine Control

Liang Dong, Wai Lio, Eric Simley

Research output: Contribution to journalArticlepeer-review

11 Scopus Citations

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 potential value creation of LAC based on simulations during the wind turbine design phase, 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 uncertainties while evaluating the benefits of LAC.

Original languageAmerican English
Pages (from-to)1491-1500
Number of pages10
JournalWind Energy Science
Volume6
Issue number6
DOIs
StatePublished - 2021

Bibliographical note

See NREL/JA-5000-79882 for article as published in Wind Energy Science Discussions

NREL Publication Number

  • NREL/JA-5000-81829

Keywords

  • coherence
  • lidar-assisted control
  • nacelle lidar
  • turbulence model

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