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