23 May 2022
23 May 2022
Status: a revised version of this preprint was accepted for the journal WES.

Extreme coherent gusts with direction change – probabilistic model, yaw control and wind turbine loads

Ásta Hannesdóttir, David Robert Verelst, and Albert Meseguer Urbán Ásta Hannesdóttir et al.
  • DTU Wind Energy Dept., Technical University of Denmark, Roskilde, Denmark

Abstract. Observations of large coherent fluctuations from a decade of measurements are used to define a probabilistic model of coherent gusts with direction change. The gust model provides the joint description of the gust rise time, amplitude and directional changes with a 50-year return period. In conjunction with the gust model, a yaw controller is presented in this study to investigate the load implications of the joint gust variables. These loads are compared with the design load case of the extreme coherent gust with direction change (ECD) from the IEC 61400-1 Ed.4 wind turbine safety standard. Within the5 framework of the gust model we find the return period of the ECD to be approximately 460 years. From the simulations we find that for gusts with a relatively long rise time the blade root flapwise bending moment, for example, can be reduced by including the considered yaw controller. From the extreme load comparison of the ECD and the modeled gusts we see that by including the variability in the gust parameters the load values from the modelled gusts are between 20 % and 74 % higher than the IEC gusts.

Ásta Hannesdóttir et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2022-38', Anonymous Referee #1, 18 Jul 2022
    • AC1: 'Reply on RC1', Ásta Hannesdóttir, 12 Sep 2022
  • RC2: 'Comment on wes-2022-38', Anonymous Referee #2, 16 Nov 2022
    • AC2: 'Reply on RC2', Ásta Hannesdóttir, 28 Nov 2022

Ásta Hannesdóttir et al.

Ásta Hannesdóttir et al.


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Short summary
In this work we use observations of large coherent fluctuations to define a probabilistic gust model. The gust model provides the joint description of the gust rise time, amplitude and direction change. We perform load simulations with a coherent gust according to the wind turbine safety standard and with the probabilistic gust model. A comparison of the simulated loads shows that the loads from the probabilistic gust model can be significantly higher due to variability in the gust parameters.