07-wind measurements 2

7/30/2019 07-Wind Measurements 2

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Deutsches Windenergie - Institut GmbH http://www.dewi.de

Wind measurements IIOperational characteristicsof sensors

Peter Busche

Deutsches Windenergie-Institut GmbH,DEWI Wilhelmshaven


Wind measurement - anemometer quality

Anemometer calibration

Anemometer quality

kind

sensitivity to flow inclination

Sensitivity of Cup Anemometers on Flow Inclination

0.92

0.94

0.96

0.98

1

1.02

1.04

1.06

1.08

70 75 80 85 90 95 100 105 110

Inclination []

FlowSpeed/v-anemometer Thies 4.3303.22.000, 8m/s

Vector A100, 8m/scosinus


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Wind measurements - dynamic effects (1)

-5

-4

-3

-2

-1

0

1

2

3

0 5 10 15

v-Thies 4.3303.22.000 / m/s

Difference:v-X-v-Thies/%

Risoe P2445bVector A100VaisalaMierijFriedrichs 4033.1100xThies Compact



systematical differences

depening on (vertical)turbulence

-5

-4

-3

-2

-1

0

1

2

3

0 5 10 15 20

v-Thies 4.3303.22.000 / m/s

Difference:v-X-v-Thies/%

Vector 8m-Mast, I=16%

Vector 30m-Mast, I=12%

Vector 52m-Mast, I=11%Vector 65m-Mast, I=9%


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Measurement of dynamic behaviour

Determination and application of

corrections





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Directional Effects of Sonics




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angular response of 3D-Sonic calibration

dataset 1616_05, 1628_05 and 1635_05 vset =14 m/s tilt 0

-0.03

-0.025

-0.02

-0.015

-0.01

-0.005

0

0.005

0.01

0.015

0.02

-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 360 370 380

azimuth angle /

rel.deviation


Directional Effects of Sonics3D Sonic calibration dataset 1616_05, 1628_05 and 1635_05

vset =14 m/s tilt 0and + - 30

-0.25

-0.2

-0.15

-0.1

-0.05

0

0.05

-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 360 370 380

azimuth angle /

rel.deviation

3D Sonic; 1616_05 0tilt 3D Sonic, 1628_05 -30tilt 3D Sonic 1635_05 +30tilt


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Wind measurement plausibility checks (1)


Wind measurements - logging

Logging of data

time series instead of statistics

mistakes usually less important

availability


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Wind measurement plausibility checks (2)

q:\2002\ermittlg\dl-02-wp\wp020312\meteo\kollia_r\05rekalibration\kollia_r.dat

w i nd dir (Di r) Ra di at io n ( ra dia te ) Pr es s ur e ( pr es s )

d [-]

01.05.02 12:0001.05.02 00:0030.04.02 12:0030.04.02 00:0029.04.02 12:0029.04.02 00:0028.04.02 12:00

Dir[deg]radiate[W/m^2]press[hPa]

350

300

250

200

150

100

50

0


Wind speed measurements

Assuring Quality

Minimum of one year of measured data

Wind measured at or near to hub height (if possible at least 2/3 of

hub height)

Use of individually calibrated anemometer according MEASNET

standard

Recording without any gaps

Measurements according IEA recommendation (Part 11)

Advantage: High accuracy

Disadvantage:- Without long term correlation only valid for the

time period measure

- Not valid for larger areas


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Uncertainty Component Typical UncertaintyRange [%]

Wind Tunnel Calibration of Anemometer 0.5-3Selection of Anemometer(Influence of Vertical Inflow and Turbulence)

0.5-4

Mounting of Anemometer 0.2-3Selection of Measuring Site 0.5-5Selection of Measuring Period 0.3-3Data Recording and Evaluation 0-2

Correlation with Long Term Data (MCP) 0.5-5Transfer to WTs Positions and Hub Heights(Micro Siting)

1-10

Total Uncertainty of Wind Speed Determination 1.5-14Uncertainty in Terms of Energy Prediction 3-30

Range of measurement uncertainties for a wind

measurement


End

07-wind measurements 2

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