friederike kinder dewi gmbh - rave-offshore.de€¦ · friederike kinder dewi gmbh site assessment...
TRANSCRIPT
Meteorological conditions at FINO1Meteorological conditions at FINO1 in the vicinity of alpha ventus
Friederike KinderDEWI GmbH
SITE ASSESSMENT . WIND TURBINE ASSESSMENT . GRID INTEGRATION . DUE DILIGENCE . KNOWLEDGE . CONSULTANCY
Page 1Contents
• Measurement system at FINO1 – Meteorological long term measurements
• Latest statistics
• Further measurements and results
• LiDAR–measurements
• FINO1 and alpha ventus
• Park correction
• Planned measurements
• Summary
Page 2Meteorological longterm measurements
Lightning detector
Page 3Availability of meteorological measurements
100From 2004 to 2011
80
90
100
50
60
70
lity
[%]
30
40
50
Avai
labi
0
10
20
0
Cups
Soni
cs
Vane
s
mpe
ratu
re
Hum
idity
Rain
Radi
atio
n
Pres
sure
Te
Page 4Distribution of wind speed and directio
Frequency of wind direction at 91.5 m LAT Directional dependency of wind speed at 103.0 m LAT
0,06
0,080
1530
45315
330345
10
120
1530
45315
330345
Wind speed
0 02
0,04
, 45
60
75285
300
315
6
8
45
60
75285
300
315[m/s]
0,00
0,02 75
90270
285
4
6 75
90270
285
105
120240
255 105
120240
255
135
150165
180195
210
225 135
150165
180195
210
225
180
2004 - 2009 2010 - 2011
180
2004 - 2009 2010 - 2011
Page 5Development of mean wind speed at 103.0 m LAT
18
Monthly mean Cummulative mean
151617
11121314
[m/s
]
89
1011
Win
d sp
eed
567
W
234
Page 6Wake of alpha ventus (LiDAR)
Sector: 90° +-5°Vertical wind profiles mesuredp o es esu edwith LiDAR in thewake of a wind turbine.
ight
[m]
Wind turbine topHei
FINO1-mast
Wind Speed [m/s]
Page 7LiDAR-measurement
• Leosphere Windcube(pulsed LiDAR with beam in 4 direction)
cup
• 10 heights from 70 m to 250 m
• Measurement in a volume of air
• Highest availability at 70 m: 98% (10 min• Highest availability at 70 m: 98% (10-min averages) during 1 year period
30°
July 2009 to
March 2011
Page 8Comparison LiDAR – FINO1-mast at 91.5 m LAT
91.5 m LAT 91.5 m LAT
DA
R [°
]
R [m
/s]
dire
ctio
n Li
D
spee
d Li
DA
R
Win
d d
Win
d
Wind speed cup FINO1 [m/s] Wind direction vane FINO1 [°]
Slope: m = 0.988
Corr coef: R2 = 0.998
Corr coef: R2 = 0.999
LiDAR mast correction Page 9
1 7
1.8FINO1 Lidar mast correction
cup
1.5
1.6
1.7
n [-]
LIDAR mast correction 91.5m
LIDAR mast ti 81 5
cup
1 8
1.2
1.3
1.4
st c
orre
ctio correction 81.5m
LIDAR mast correction 71.5m
30°1.6
1.7
1.8FINO1 91.5m LAT
UAM mast
0.9
1.0
1.1mas
1.3
1.4
1.5
orre
ctio
n [-] correction
0.80 30 60 90 120 150 180 210 240 270 300 330 360
wind direction FINO1 [ ]1 0
1.1
1.2
mas
t co
LIDAR mast
0.8
0.9
1.0
0 30 60 90 120 150 180 210 240 270 300 330 360
correction
wind direction FINO1 [ ]
Page 10FINO1 and alpha ventus
Free flow from West with FINO1
Wind measurements influenced by alpha ventus
Alpha Ventus
Free flow from East with LiDAR
FINO1
Converter stationLiDAR
Turbulence intensity and wind speed reduction Page 11
Influence of alpha ventus becomes obvious inobvious in turbulence intensity. Local maxima are relatedmaxima are related to wind turbines. The ratio of free and disturbed wind speed shows a similar pattern.
Park factor at FINO1 Page 12
Park factor depending on wind direction for different heights and wind speeds.
Future measurements Page 13
• Turbulent heat fluxes – Eddy CovariancePrecise investigation of atmospheric stability• Precise investigation of atmospheric stability
• Open-path infrared-hygrometers (Licor) combined with Ultrasonic-Anemometer
• Installation running
• LiDAR – permanent measurement (heights > 100 m) • Wind field above 100 m
• Over long time
• CeilometerCeilometer• Measurement of cloud base height
Summary Page 14
• FINO1-measurements are successfulfor 8 years• for 8 years
• with good availability
• mean wind speed 10 m/s, mean wind direction south west
• LiDAR gives opportunity• to derive mast correction
• for measurement heights above hub height and FINO1-mast
• for free wind measurements 360 ° around alpha ventus
• Alpha ventus• Turbulence intensity increase
• Wind speed reductionWind speed reduction
• Park correction is derived from combined FINO1 and LiDAR measurements
Thank you for your attention!Thank you for your attention!
The FINO1 platform is one of three offshorel f f h FINO P j Th LiDARplatforms of the FINO Project. The LiDAR
measurements were performed within the researchproject FINO and RAVE. Both projects are fundedby the Federal Ministry for the Environment, NatureC ti d N l S f t (BMU)Conservation and Nuclear Safety (BMU).
SITE ASSESSMENT . WIND TURBINE ASSESSMENT . GRID INTEGRATION . DUE DILIGENCE . KNOWLEDGE . CONSULTANCY