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The impact of turbulence intensity and atmospheric stability on power deficits due to wind turbine wakes at Horns Rev wind farm. / Hansen, Kurt Schaldemose; Barthelmie, Rebecca J.; Jensen, Leo E.; Sommer, Anders.

In: Wind Energy, Vol. 15, No. 1, 2012, p. 183-196.

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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Hansen, Kurt Schaldemose; Barthelmie, Rebecca J.; Jensen, Leo E.; Sommer, Anders / The impact of turbulence intensity and atmospheric stability on power deficits due to wind turbine wakes at Horns Rev wind farm.

In: Wind Energy, Vol. 15, No. 1, 2012, p. 183-196.

Publication: Research - peer-reviewJournal article – Annual report year: 2012

Bibtex

@article{13fb992c92c44b96bae7acff21da6d4d,
title = "The impact of turbulence intensity and atmospheric stability on power deficits due to wind turbine wakes at Horns Rev wind farm",
keywords = "Wakes, Wind farms, Offshore, Observations, Power deficits, Stability",
publisher = "John/Wiley & Sons Ltd.",
author = "Hansen, {Kurt Schaldemose} and Barthelmie, {Rebecca J.} and Jensen, {Leo E.} and Anders Sommer",
year = "2012",
doi = "10.1002/we.512",
volume = "15",
number = "1",
pages = "183--196",
journal = "Wind Energy",
issn = "1095-4244",

}

RIS

TY - JOUR

T1 - The impact of turbulence intensity and atmospheric stability on power deficits due to wind turbine wakes at Horns Rev wind farm

A1 - Hansen,Kurt Schaldemose

A1 - Barthelmie,Rebecca J.

A1 - Jensen,Leo E.

A1 - Sommer,Anders

AU - Hansen,Kurt Schaldemose

AU - Barthelmie,Rebecca J.

AU - Jensen,Leo E.

AU - Sommer,Anders

PB - John/Wiley & Sons Ltd.

PY - 2012

Y1 - 2012

N2 - The wind turbine operational characteristics, power measurements and meteorological measurements from Horns Rev offshore wind farm have been identified, synchronized, quality screened and stored in a common database as 10 min statistical data. A number of flow cases have been identified to describe the flow inside the wind farm, and the power deficits along rows of wind turbines have been determined for different inflow directions and wind speed intervals. A method to classify the atmospheric stability based on the Bulk-Ri number has been implemented. Long-term stability conditions have been established, which confirms, in line with previous results, that conditions tend towards near neutral as wind speeds increase but that both stable and unstable conditions are present at wind speeds up to 15 m s1. Moreover, there is a strong stability directional dependence with southerly winds having fewer unstable conditions, whereas northerly winds have fewer observations in the stable classes. Stable conditions also tend to be associated with lower levels of turbulence intensity, and this relationship persists as wind speeds increase. Power deficit is a function of ambient turbulence intensity. The level of power deficit is strongly dependent on the wind turbine spacing; as turbulence intensity increases, the power deficit decreases. The power deficit is determined for four different wind turbine spacing distances and for stability classified as very stable, stable and others (near neutral to very unstable). The more stable the conditions are, the larger the power deficit.

AB - The wind turbine operational characteristics, power measurements and meteorological measurements from Horns Rev offshore wind farm have been identified, synchronized, quality screened and stored in a common database as 10 min statistical data. A number of flow cases have been identified to describe the flow inside the wind farm, and the power deficits along rows of wind turbines have been determined for different inflow directions and wind speed intervals. A method to classify the atmospheric stability based on the Bulk-Ri number has been implemented. Long-term stability conditions have been established, which confirms, in line with previous results, that conditions tend towards near neutral as wind speeds increase but that both stable and unstable conditions are present at wind speeds up to 15 m s1. Moreover, there is a strong stability directional dependence with southerly winds having fewer unstable conditions, whereas northerly winds have fewer observations in the stable classes. Stable conditions also tend to be associated with lower levels of turbulence intensity, and this relationship persists as wind speeds increase. Power deficit is a function of ambient turbulence intensity. The level of power deficit is strongly dependent on the wind turbine spacing; as turbulence intensity increases, the power deficit decreases. The power deficit is determined for four different wind turbine spacing distances and for stability classified as very stable, stable and others (near neutral to very unstable). The more stable the conditions are, the larger the power deficit.

KW - Wakes

KW - Wind farms

KW - Offshore

KW - Observations

KW - Power deficits

KW - Stability

U2 - 10.1002/we.512

DO - 10.1002/we.512

JO - Wind Energy

JF - Wind Energy

SN - 1095-4244

IS - 1

VL - 15

SP - 183

EP - 196

ER -