On wind farm wake mixing strategies using dynamic individual pitch control

Joeri Frederik,Jan-Willem Van Wingerden,Sebastiaan Mulders,Bart Doekemeijer

doi:10.1088/1742-6596/1618/2/022050

Joeri Frederik, Jan-Willem Van Wingerden + Show 2 more

Open Access

https://doi.org/10.1088/1742-6596/1618/2/022050

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Abstract

Dynamic wind farm control is a new strategy that aims to apply time-varying, often periodic, control signals on upstream wind turbines to increase the wake mixing behind the turbine. As a result, wake recovery is accelerated, leading to a higher power production of downstream turbines. As the amount of interest in dynamic control strategies for wind turbines in a wind farm is increasing, different approaches are being proposed. One such novel approach is called Dynamic Individual Pitch Control (DIPC). In DIPC, each blade pitch angle of a turbine is controlled independently to dynamically manipulate the direction of the thrust force vector exerted on the wind. Hence, the direction of the wake is varied, inducing wake mixing without significant thrust force magnitude variations on the rotor. In this paper, the effectiveness of different variations in the thrust direction are evaluated and compared using Large Eddy Simulation (LES) experiments.

Highlights

In the quest to increase the power production of wind farms, researchers and companies are looking for control strategies that increase the power production of turbines located in the wake of another turbine
The negative effects on the controlled turbine for Dynamic Individual Pitch Control (DIPC) are much lower than for Dynamic Induction Control (DIC), while the power loss of static derating is substantially higher than for DIPC. This indicates that especially tilt DIPC, which performs slightly better than yaw DIPC, could be an interesting compromise for decreasing the wake deficit and with limited effects on the controlled turbine
The results presented here indicate that wake manipulation in vertical direction, tilt DIPC, is more effective than its horizontal counterpart, yaw DIPC

Summary

Introduction

In the quest to increase the power production of wind farms, researchers and companies are looking for control strategies that increase the power production of turbines located in the wake of another turbine. As the amount of interest in dynamic control strategies for wind turbines in a wind farm is increasing, different approaches are being proposed. In DIPC, each blade pitch angle of a turbine is controlled independently to dynamically manipulate the direction of the thrust force vector exerted on the wind.

Results

Conclusion