The helix approach: Using dynamic individual pitch control to enhance wake mixing in wind farms

Joeri A. Frederik*, Bart M. Doekemeijer, Sebastiaan P. Mulders, Jan Willem van Wingerden

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)
29 Downloads (Pure)

Abstract

Wind farm control using dynamic concepts is a research topic that is receiving an increasing amount of interest. The main concept of this approach is that dynamic variations of the wind turbine control settings lead to higher wake turbulence, and subsequently faster wake recovery due to increased mixing. As a result, downstream turbines experience higher wind speeds, thus increasing their energy capture. In dynamic induction control (DIC), the magnitude of the thrust force of an upstream turbine is varied. Although very effective, this approach also leads to increased power and thrust variations, negatively impacting energy quality and fatigue loading. In this paper, a novel approach for the dynamic control of wind turbines in a wind farm is proposed: using individual pitch control, the fixed-frame tilt and yaw moments on the turbine are varied, thus dynamically manipulating the wake. This strategy is named the helix approach because the resulting wake has a helical shape. Large eddy simulations of a two-turbine wind farm show that this approach leads to enhanced wake mixing with minimal power and thrust variations.

Original languageEnglish
Pages (from-to)1739-1751
JournalWind Energy
Volume23
Issue number8
DOIs
Publication statusPublished - 2020

Keywords

  • dynamic induction control
  • enhanced wake mixing
  • helix approach
  • individual pitch control
  • wake recovery
  • wind farm control

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