Abstract
Abstract. Wake steering is a form of wind farm control in which turbines use yaw offsets to affect wakes in order to yield an increase in total energy production. In this first phase of a study of wake steering at a commercial wind farm, two turbines implement a schedule of offsets. Results exploring the observed performance of wake steering are presented and some first lessons learned. For two closely spaced turbines, an approximate 14 % increase in energy was measured on the downstream turbine over a 10∘ sector, with a 4 % increase in energy production of the combined upstream–downstream turbine pair. Finally, the influence of atmospheric stability over the results is explored.
Highlights
Wind farm control is a field of research in which the control actions of individual turbines are coordinated to improve the total performance of the wind farm as defined by the total power production of the wind farm and the loads experienced by downwind turbines
Wake steering has been studied through wind tunnel studies (e.g., Medici and Alfredsson, 2006; Park et al, 2016; Schottler et al, 2017; Bartl et al, 2018), and large-eddy simulation (LES) studies of wake steering have been undertaken to date
The wind speeds at heights corresponding to the turbine rotor were collected and applied to a weighted average, called Usodar, wherein the weights were proportional to the sector of rotor area the heights correspond with, similar to a rotor-effective wind speed calculation (Wagner et al, 2014)
Summary
Wind farm control is a field of research in which the control actions of individual turbines are coordinated to improve the total performance of the wind farm as defined by the total power production of the wind farm and the loads experienced by downwind turbines. Flow Redirection and Induction in Steady State (FLORIS; NREL, 2019) is a software repository that provides an engineering model of wake steering that can be used in the design and analysis of wind farm control applications (Gebraad et al, 2016). Fleming et al.: Initial results from a field campaign of wake steering – Part 1. There is a need for more conclusive field campaigns on the performance of wake steering and the evaluation of the latest models. Wake steering controls based on the latest version of FLORIS are implemented on two turbines. The main contribution of this paper is the initial results and analysis of a land-based wake steering field-test campaign. The paper presents the controller as implemented in the present phase and proposes improvements based on these initial results.
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