deep sea offshore wind power r&d seminar trondheim, 20-21 ... · vision i: (1) full scale off...

Deep Sea Offshore Wind PowerR&D Seminar Trondheim, 20-21 Jan. 2011 ,

Atmospheric Profiling by Lidar for Wind Energy ResearchEnergy Research

Torben Mikkelsen

Wind Energy DivisionRisø National Laboratory for Sustainable Energy - DTU

WindScanner.dk

From new Wind Lidar Technologygy

towards new Wind Energy

Research Infrastructures : EU ESFRISpinnerEX

WindScanner.dk2010-2013

Research Infrastructures…: EU ESFRI

Road Map

2010 MusketeerEX 2007/2008

SpinnerEX 2009

RI focusFirst CW Wind

lidar 2004

00 / 008

Scientific focus

Technical focus

Risø DTUWINDSCANNER.DK 2 Risø DTU, Technical University of Denmark

VISION I:(1)

VISION I:Full scale off and on shore measurements on WT arrays & wakes e.g. as here at Horns reef


Vision II: RI WindscannerSecure wind resource estimation in particular in complex terrain2


(3)

VISION IIIPro active wind turbine control from upwind measurements by lidars Pro-active wind turbine control from upwind measurements by lidars

integrated in the nacelle… :


Short-range WindScannersS o t a ge dSca e s


The RI WINDSCANNER methodology is based on 3-dimensional scanning with wind lidars to determine the instantaneous turbulence

fields:fields:

Since 2005 wind lidar technology has enabled


gyreplacement of tall (>100m) met masts

Our Aim: To measure 3-D wind fields in 2-D planes p


Wind Turbines of today and tomorrow extract energy from the wind… ….but generates also wakes, over land…(eScience):

…and off-shore (Middelgrunden @ Copenhagen…)


MusketeerEx-II:MusketeerEx-II:Høvsøre Dec. 2008 Windscanner lidar testSpatial-resolution improved ”Stretch Pod” Unit 107 (left) vs. Windscanner Unit 120 (right)


.. The first assembled Windscanner (April 2010):


WindScanner.dk: 12 -axes Control System

Conneting and steering of 9 (+3 ) akser:

Risø DTUWINDSCANNER.DK 14 Risø DTU, Technical University of Denmark 14

Long-Range WindScanning:o g a ge dSca gOn and offshore Ressource Assessment,Wind Conditions, Wakes


Specifications: Long-Range Wind Scanner:

WLS70 +2D Risø DTU/ Leosphere Scan Head:

• Range:• Range 1.5 - 5 km depending on aerosols

and sampling time• Resolution:• Space: Line-of-sight: 50-55 m(FWHM)• Time: 1-10 s pr. measurement• Drive specifications for both axis:• Resolution ≤ 2mrad• Speed ≤ 50°/s• Acceleration > 100°/s2• Rotation = Continuous• Backlash ≤ 0.5mrad• Endless rotation• Full sky scanning + “down-look”


First Long Range Windscanner: O t 2010First Long-Range Windscanner: Oct.2010Joint Risø DTU-Leosphere WLS70 (<1.5 km)/200 (<5 km)


First Long-Range (Max range 5 km) WindScanner

Risø Workshop Risø DTU, Leosphere, Fr. and IPU, DK, Oct. 2010


WindCube 002 modifyed for Risø MET-Mast EX 2009/2010:

Turbulence measured over Risø DTU by Doppler Lidar

for basic power spectral and coherence studies


Risø MET- Mast EX Dec 2009

• 125 m above ground: Inertial Subrange


(3)

Results to date…: Pro active wind turbine control from upwind measurements by lidars Pro-active wind turbine control from upwind measurements by lidars

integrated in the nacelle… :


• 25 kW Wind Turbine 1975: •2.3 MW NM80

Ø

• Ø/H ~ 0.3 • Height 59 m;

• Ø=80HØ • Ø/H ~ 1.4

HHHH


Measurement Setup’s:

Period Wedge Distance

April – May 2009 15o ~1.24Øp y

July – August 2009 30o ~0.58Ø

Animation Horizontal Wind Speed.avi

Wind speed values per rotation (each frame contains 10 consecutive

scanning circles)


CW Lidar: ZephIR (50 Hz)

Tj b Tjæreborg SPINNER-EX

2009

Spinner – mounted lidar

Wind Turbine: NM80(NegMicon/Vestas)(NegMicon/Vestas)


Tjæreborg: ZephIR “Spinner-Ex.” …:Tjæreborg: ZephIR Spinner Ex. …:


MVI_3006.AVI


Time series (10 s) of approaching wind ( ) pp gconditions measured +100 m upwind:

E I h i d fi ldEx.: Inhomogeneous wind field


Upwind @ 1.24 Ø (+ 100 m):

The loci of the focussed lidar beam

Radial wind speeds

during a 10-min sampling period


Results

Correlation between lidar and mast

Study of the approaching wind field


Scanning in 2-D:Scanning in 2 D:

”Risley prism”

Dual-prism single-axis beam steering:p g g


2D LIDAR UpWind Scan patterns:

Scan Patterns for principle 1,different possibilities

Scan pattern series 2, n= 6

and

Scan pattern series 8, n=6


Scope for further wind LIDAR integration:Scope for further wind LIDAR integration:

Rotor Plane Upwind

Blade integrated

Spinnerintegratedintegrated

lidarintegrated

lidar


Lidar-based Remote Sensing:

Off h Wi d S d P filOffshore Wind Speed Profiles:

Why ”Remote Sensing” ?

• Wind Turbines are becoming BIG!• Tall ( > 100 meters) Meteorological Towers expensive• Tall Met Towers are difficult to move


3

SODAR SO nd Detection And RangingSODAR: SOund Detection And Ranging


3

R.L Schwiesow, Probing the atmospheric boundary layer

Monostatic SODAR

Risø DTUWINDSCANNER.DK 38 Risø DTU, Technical University of Denmark Lidar and sodar Introduction

3

Phased Array


3

Test of SODAR’S

HeimdallHeimdall

Aeronvironment


4


4

N o n - f i l t e r e d d a t a ( p o i n t s r e c o v e r e d 9 5 4 9 o u t o f 1 2 5 3 2 ) , s e c t o r : 0 ° -3 6 0 °

y = 1 . 0 0 3 5 x - 0 . 0 7 9

2 0

2 5

1 0

1 5

2 0

soda

r 130

m, w

sp (m

/s)

0

5

0 5 1 0 1 5 2 0 2 5

t o w e r 1 2 5 m , w s p ( m / s )

s

8<SNR<35 (no. of points 4210), sector: 0°-360°

y = 1.0331x - 0.3219

14

16

18

6

8

10

12

dar 1

30m

, wsp

(m/s

)

-2

0

2

4

0 2 4 6 8 10 12 14 16 18

tower 125m, wsp (m/s)

sod


4


4

Ground-based RS Wind Sensors @ Høvsøre 2004 - 2009:

SODARS

CW LIDARS

Pulsed LIDARS


4

Sodar data is inherently noisier than lidar datadata

d lid

AQS500 Spd 75m vs Cup 80my = 1.0237x + 0.0055

R2 = 0.989 Windcube vs Cup at 80my = 0.9969x - 0.0447

R2 = 0.9962y = 0.9922xR2 = 0.9962

sodar lidar

20

25

20

25

15

500

75m 15

peed

[m/s

]5

10AQ

S5

5

10

Lida

r sp

00 5 10 15 20 25

Cup 80m

0

5

0 5 10 15 20 25

C d 80 [ / ]

Risø DTU, Technical University of Denmark

Cup 80m Cup speed 80m [m/s]


4

Horns Rev wind farm


4

Horns Rev-I Wind Farm


4

Meteorological masts and transformer platformMeteorological masts and transformer platform

C t d t• Cup anemometers and vanes atdifferent levels on all masts(15~70m)

Courtesy: Dong Energy

• LIDAR/SODAR installed at 20mon the platform

• Campaign period: May 2 – Oct29, 2006


4

Courtesy: Dong Energy

Horns Rev 2006 ZephIR Lidar and an AQ-SODAR side-by-

12 Mega Watt….RS Off Shore

Horns Rev 2006 ZephIR Lidar and an AQ SODAR side byside…:


5

Correlations between LIDAR and M2/M6 for free Correlations between LIDAR and M2/M6 for free sectors


5

Wind profile extension with LIDAR data at M2/M6


5

160

140140

120120

100

80

60

40

20

Wind Shear as function of TemperatureWind Shear as function of Temperaturedifference: Tair - SST Courtecy: Leo Jensen, Dong Energy

Risø DTUWINDSCANNER.DK 56 Risø DTU, Technical University of DenmarkDoc. info 271939 56

Tall Wind Profiles: Lidar WLS70 50m-1.5 km

Lidar vs. Høvsøre Met-mast @ 100 m:


Wind Speeds @ Høvsøre 100m heightWRF Prediction vs Lidar MeasurementsWRF Prediction vs. Lidar Measurements


WRF vs. Lidar @ 100 m (left) @ 600 m (right)


WRF Profiles vs. Met-mast/Lidar @ 10-600mFriction velocity u from WRFFriction velocity u* from WRF.Binned according to Atm. Stability.


Find more details at:www risoe dk

• Acknowledgements to many Risø DTU colleges:

www.risoe.dkwww.windscanner.dk

• Acknowledgements to many Risø DTU colleges:

• Charlotte HasagerAlfredo Peña• Alfredo Peña

• Roger Floors, • Ekaterina Batchvarova

S E ik G i• Sven-Erik Gryning• Andrea Hahmann• Mikael Sjöholm

k l l• Nikolas Angelou• Kasper Hansen


WindScannerWindScanner


Short‐range:


Long‐range:


Wind turbine control:


Off shore:


deep sea offshore wind power r&d seminar trondheim, 20-21 ... · vision i: (1) full scale off...

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