WINDTEST Kaiser-Wilhelm-Koog GmbH EWEC 2007 Session DT2 Slide No. 1 Comparison of the ZephIR Wind-LiDAR to Classical Cup Measurements On- and Offshore Detlef Kindler WINDTEST Kaiser-Wilhelm-Koog GmbH Andy Oldroyd Oldbaum Services Ltd. EWEC 2007, Milan, Italy “Advances in measuring methods” Technical Track - Session DT2, 10 Mai 2007 supported by: EU-Project DOWNVInD - Partners Title

WINDTEST Kaiser-Wilhelm-Koog GmbH EWEC 2007 Session DT2 Slide No. 2 Motivation Onshore and Offshore Assesment Campaign  5M met.mast site, Brunsbüttel  Offshore platform FINO-1, Germany Assessment Results  Availability  Data quality Wind Speed Profiles Turbulence Comparisons Summary Outline

WINDTEST Kaiser-Wilhelm-Koog GmbH EWEC 2007 Session DT2 Slide No. 3 Remote Sensing (LiDAR) as primary wind resource monitoring method for Beatrice Windfarm Demonstrator Project Assessment of capabilities of the ZephIR Wind LiDAR Suitability for offshore purposes Motivation 5M Offshore

WINDTEST Kaiser-Wilhelm-Koog GmbH EWEC 2007 Session DT2 Slide No. 4 Acceptance Criteria Acceptance criteria for the ZephIR being used as the primary wind monitioring method on the Beatrice Alpha platform:  Availability:> 95 % (system & data)  Data quality:wind speed relative to cups (4 to 16 m/s) linear regression through origin Y = mx + b (i.e. with b==0) 0.97 < m < 1 R 2 > 0.95

WINDTEST Kaiser-Wilhelm-Koog GmbH EWEC 2007 Session DT2 Slide No. 5 5M Onshore Test 120 m 90 m 60 m 3 month campaign: 30 Sep 2005 until 5 Jan 2006 Fairly large distance to met.mast Complex surrounding: industrial plants, wind turbines 70 m

WINDTEST Kaiser-Wilhelm-Koog GmbH EWEC 2007 Session DT2 Slide No. 6 FINO-1 Offshore Test ZephIR North Sea, 45 km North of German island Borkum Annual mean wind speed on 100 m: ~ 10 m/s Prevailing wind dir.: SW Mast top height: 103 m ZephIR height: 25 m 5 Month campaign March to July 2006 ZephIR close to mast ( ~ 10 m) No disturbance by met.mast on LiDAR 103 m 81 m 61 m

WINDTEST Kaiser-Wilhelm-Koog GmbH EWEC 2007 Session DT2 Slide No. 7 Availability Onshore – 5M Met.-Mast Site Overall System Availability: 99.6 % Overall Data Availability (10-Min.-Avg.): 95.2 % Offshore – FINO 1 Platform Overall System Availability:100.0 % Overall Data Availability (10-Min.-Avg.): 99.6 %

WINDTEST Kaiser-Wilhelm-Koog GmbH EWEC 2007 Session DT2 Slide No. 8 WS Regressions Onshore Slope: m = 0.97 Regr. coefficient: R 2 = mSlope: m = 0.95 Regr. coefficient: R 2 = m

WINDTEST Kaiser-Wilhelm-Koog GmbH EWEC 2007 Session DT2 Slide No. 9 Height: 103 (78) m WS range: 2 to 23 m/s Regression: m = 0.97 R 2 = 0.99 WS Comparison Offshore Cup LiDAR

WINDTEST Kaiser-Wilhelm-Koog GmbH EWEC 2007 Session DT2 Slide No. 10 WS Regressions Offshore 81 (56) m Slope: m = 0.97 Regr. coefficient: R 2 = (36) m Slope: m = 0.98 Regr. coefficient: R 2 = 1.00

WINDTEST Kaiser-Wilhelm-Koog GmbH EWEC 2007 Session DT2 Slide No. 11 WS Regression Results

WINDTEST Kaiser-Wilhelm-Koog GmbH EWEC 2007 Session DT2 Slide No. 12 WS Weibull Distribution CupLiDAR

WINDTEST Kaiser-Wilhelm-Koog GmbH EWEC 2007 Session DT2 Slide No. 13 Assessment Summary Good performance onshore despite terrain complexity  ZephIR passed acceptance Offshore test FINO-1, similar environment as on Beatrice  better correlation offshore than onshore Main result  WS deviation from Cups < 3%  Availability close to 100% (NO weather dependence)  good handling, easy to install System passed acceptance onshore and offshore  installation on Beatrice in Nov  stand-alone operation for wind monitoring, good performance since Note: 1 st Beatrice 5M wind turbine connected since last Tue, 8 th May 2007

WINDTEST Kaiser-Wilhelm-Koog GmbH EWEC 2007 Session DT2 Slide No. 14 WS Profiles Wind Speed Profiles – Vertical Sampling: Cup:point measurement LiDAR:“average” over vertical range  change of probing length with height AltitudeL 40m2.5 m 60m6 m 100m16 m 200m65 m Source: RISOE

WINDTEST Kaiser-Wilhelm-Koog GmbH EWEC 2007 Session DT2 Slide No. 15 WS Profiles Offshore

WINDTEST Kaiser-Wilhelm-Koog GmbH EWEC 2007 Session DT2 Slide No. 16 WS Turbulence Wind Speed Turbulence (10 minute averaging) TRB = WS-STD / WS-Mean[%] Sampling Cup:1 Hz  600 values Sampling LiDAR:3 sec for individual height scan 5 consecutive heights  max. 40 values

WINDTEST Kaiser-Wilhelm-Koog GmbH EWEC 2007 Session DT2 Slide No. 17 WS Standard Deviation Onshore Offshore

WINDTEST Kaiser-Wilhelm-Koog GmbH EWEC 2007 Session DT2 Slide No. 18 Turbulence vs. WS Onshore Offshore

WINDTEST Kaiser-Wilhelm-Koog GmbH EWEC 2007 Session DT2 Slide No. 19 Turbulence WS Binned Onshore Offshore

WINDTEST Kaiser-Wilhelm-Koog GmbH EWEC 2007 Session DT2 Slide No. 20 Turbulence Differences in mast measurements Cup type Thies-1 st -Class (On-), Vector (Offshore) STD calculation 1Hz, 600 values, 10 Min.-STD 1Hz, 60 values, 1 Min.STD  10 Min.STD (according to IEC) Other differences onshore vs. offshore Terrain, obstacles Surface roughness Atmospheric stability  impact on dominant turbulence length scales Character of volume measuring technique more pronounced onshore …

WINDTEST Kaiser-Wilhelm-Koog GmbH EWEC 2007 Session DT2 Slide No. 21 Overall Summary / Outlook Assessment campaign: good availability and data quality  onshore & offshore Absolute wind speed accuracy is close to that of cups (with high quality calibrations) WS profiles: good resemblance to cup / met.mast results ZephIR turbulence measures compare to cup turbulence measures onshore and offshore, differently …? Outlook More operational experiences are needed e.g. complex terrain applications Reproducibility device to device needs to be proven Best practice application procedures – testing / calibration Work towards standard acceptance / incorporation (e.g. IEC)

WINDTEST Kaiser-Wilhelm-Koog GmbH EWEC 2007 Session DT2 Slide No. 22 Thanks