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Wind farm control using dynamic concepts is a research topic that isreceiving an increasing amount of interest. The main concept of this approachis that dynamic variations of the wind turbine control settings lead to higherwake turbulence, and subsequently faster wake recovery due to increased mixing.As a result, downstream turbines experience higher wind speeds, thus increasingtheir energy capture. The current state of the art in dynamic wind farm controlis to vary the magnitude of the thrust force of an upstream turbine. Althoughvery effective, this approach also leads to increased power and thrustvariations, negatively impacting energy quality and fatigue loading. In thispaper, a novel approach for the dynamic control of wind turbines in a wind farmis proposed: using individual pitch control, the fixed-frame tilt and yawmoments on the turbine are varied, thus dynamically manipulating the wake. Thisstrategy is named the helix approach since the resulting wake has a helicalshape. Large eddy simulations of a two-turbine wind farm show that the helixapproach leads to enhanced wake mixing with minimal power and thrustvariations.

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