Automated wind turbine wake characterization in complex terrain

Barthelmie, Rebecca J.; Pryor, Sara C.

doi:10.5194/amt-12-3463-2019

Title: Automated wind turbine wake characterization in complex terrain

Journal Article · 28 June 2019 · Atmospheric Measurement Techniques (Online)

DOI: https://doi.org/10.5194/amt-12-3463-2019 · OSTI ID:1530002

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Cornell Univ., Ithaca, NY (United States)

An automated wind turbine wake characterization algorithm has been developed and applied to a data set of over 19 000 scans measured by a ground-based scanning Doppler lidar at Perdigão, Portugal, over the period January to June 2017. Potential wake cases are identified by wind speed, direction and availability of a retrieved free-stream wind speed. The algorithm correctly identifies the wake centre position in 62% of possible wake cases, with 46 % having a clear and well-defined wake centre surrounded by a coherent area of lower wind speeds while 16 % have split centres or multiple lobes where the lower wind speed volumes are no longer in coherent areas but present as two or more distinct areas or lobes. Only 5 % of cases are not detected; the remaining 33 % could not be categorized either by the algorithm or subjectively, mainly due to the complexity of the background flow. Average wake centre heights categorized by inflow wind speeds are shown to be initially lofted (to two rotor diameters, D, downstream) except when the inflow wind speeds exceed 12 ms^-1. Even under low wind speeds, by 3.5 D downstream of the wind turbine, the mean wake centre position is below the initial wind turbine hub height and descends broadly following the terrain slope. However, this behaviour is strongly linked to the hour of the day and atmospheric stability. Overnight and in stable conditions, the average height of the wake centre is 10 m higher than in unstable conditions at 2 D downstream from the wind turbine and 17 m higher at 4.5 D downstream.

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Research Organization:: Iowa State Univ., Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE

Grant/Contract Number:: SC0016438

OSTI ID:: 1530002

Alternate ID(s):: OSTI ID: 1612559

Journal Information:: Atmospheric Measurement Techniques (Online), Vol. 12, Issue 6; ISSN 1867-8548

Publisher:: European Geosciences UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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