| Author(s) | Joeri A. Frederik, Bart M. Doekemeijer, Sebastiaan P. Mulders, Jan-Willem van Wingerden |
| Journal | Journal |
| Year | 2020 |
| DOI / Link | https://doi.org/10.1002/we.2513 |
| Keywords | Helix approach, active wake mixing, dynamic induction control, individual pitch control |
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.