Increased Power Gains from Wake Steering Control Using Preview Wind Direction Information

Balthazar Sengers, Andreas Rott, Eric Simley, Michael Sinner, Gerald Steinfeld, Martin Kuhn

Research output: Contribution to journalArticlepeer-review

Abstract

Yaw controllers typically rely on measurements taken at the wind turbine, resulting in a slow reaction to wind direction changes and subsequent power losses due to misalignments. Delayed yaw action is especially problematic in wake steering operation because it can result in power losses when the yaw misalignment angle deviates from the intended one due to a changing wind direction. This study explores the use of preview wind direction information for wake steering control in a two-turbine setup with a wind speed in the partial load range. For these conditions and a simple yaw controller, results from an engineering model identify an optimum preview time of 90?s. These results are validated by forcing wind direction changes in a large-eddy simulation model. For a set of six simulations with large wind direction changes, the average power gain from wake steering increases from only 0.44% to 1.32%. For a second set of six simulations with smaller wind direction changes, the average power gain from wake steering increases from 1.24% to 1.85%. Low-frequency fluctuations are shown to have a larger impact on the performance of wake steering and the effectiveness of preview control, in particular, than high-frequency fluctuations. From these results, it is concluded that the benefit of preview wind direction control for wake steering is substantial, making it a topic worth pursuing in future work.
Original languageAmerican English
Pages (from-to)1693-1710
Number of pages18
JournalWind Energy Science
Volume8
Issue number11
DOIs
StatePublished - 2023

Bibliographical note

See NREL/JA-5000-84680 for article as published in Wind Energy Science Discussions

NREL Publication Number

  • NREL/JA-5000-88634

Keywords

  • feedforward
  • LES
  • preview control
  • wake steering
  • yaw system

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