Modelling of offshore wind resources. Comparison of a meso-scale model and measurements from FINO 1 and North Sea oil rigs. - PowerPoint PPT Presentation

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Modelling of offshore wind resources. Comparison of a meso-scale model and measurements from FINO 1 and North Sea oil rigs.

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Modelling of offshore wind resources. Comparison of a meso-scale model and measurements from FINO 1 and North Sea oil rigs. by 1Erik Berge, 1 yvind Byrkjedal, 1Yngve ... – PowerPoint PPT presentation

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Title: Modelling of offshore wind resources. Comparison of a meso-scale model and measurements from FINO 1 and North Sea oil rigs.


1
Modelling of offshore wind resources. Comparison
of a meso-scale model and measurements from FINO
1 and North Sea oil rigs. by 1Erik Berge,
1Øyvind Byrkjedal, 1Yngve Ydersbond and 2Detlef
Kindler 1Kjeller Vindteknikk AS, 2Windtest
Kaiser-Wilhelm-Koog GmbH
2
Aim of the study
  • Validate meso-scale models for calculation of
    offshore wind conditions
  • In particular, validate model derived vertical
    wind profiles in the marine boundary layer
  • The study is a part of the NORSEWIND project on
    developing Wind Atlases for the Irish Sea, North
    Sea and Baltic Sea.

3
Meteorological model WRF Weather Research and
forecast model set-up
2 km resolution
6 km resolution
18 km resolution
4
Model set-up
  • NCEP boundary data every 3 hour
  • WRF-runs for 27 hours covering 1 day
  • Model runs for all three domains for four
    complete years (2004-2007)
  • Data stored hourly in every grid-point for all
    model layers

FINO 1
5
Measurements from the FINO 1 plattform
6
Measurements
  • 10 min. data available for the period 2004-2007
  • Wind speed-data corrected for mast effects by use
    of the Lidar

7
Annual and monthly averages
WRF yields 0.2 m/s lower annual average Hourly
correlation is 0.92
8
Wind roses and Weibull distributions
WRF
FINO 1
9
Vertical wind shear and temperature differences -
January 2004
10
Average vertical wind shear based on model and
measurements
11
Wind speed measurements at North Sea oil rigs
Sleipner platform
12
Comparison of platform measurements with the
WRF-model
Height of meas. Observed average WRF average WRF average Hourly correlation
Troll 94 m 10.9 10.4 - 5 0.90
Gullfaks C 142.5 m 11.8 10.7 - 9 0.90
Sleipner A 136 m 11.8 10.7 -10 0.91
Ekofisk 100m 10.9 10.3 - 5 0.91
Height Observed average WRF average WRF average Hourly correlation
Fino 1 100 m 10.04 9.87 - 2 0.92
13
Summary and conclusions
  • An offshore wind analysis carried out in the
    framework of NORSEWIND
  • Long-term average wind speed very well predicted
    by meso-scale model WRF at FINO 1 ( 2 deviation
    over 4 years).
  • Some deviations for modelled wind shear
    WRF ?100-600.08, while obs ?100-600.06.
    Uncertainties also larger in obs wind shear.
  • Wind shear clearly linked to atmospheric
    stability.

14
Summary and conclusions cont.
  • Model data indicate that oil rig annual average
    wind speed data could be overestimated by 5-10.
  • Focus will be given to further assess the wind
    profiles, oil rig data and the meso-scale model
    data within NORSEWIND by use of LIDAR
    measurements, satellite data etc.
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