large blade testing facility large wind turbines rahul yarala executive director, wind technology...
Post on 20-Jan-2016
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WHY OFFSHORE WIND?Resource near load centersMinimize greenhouse gas emissions from electricity generationMinimal water consumption for electricity generationEnergy IndependenceGreen Jobs and local economic development
Higher Capacity FactorsLow shear and turbulenceHigher wind speedsTurbines can spin at higher tip speeds and hence higher energy production
A POWERFUL RESOURCE IN US
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WHY LARGER TURBINES?
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CHALLENGES and OPPORTUNITIESRotor Blade StructureNew materialsTwo-pieceLarger Chords
New Tower conceptsComposite materialsLighter and corrosion resistanceDrivetrainDirect drive or low speed
Foundations
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Corrosion protection
Site specific wind data collection and correlation with mesoscale weather prediction models for wind assessment.Further research and data collection using newer offshore friendly technology like LIDAR, SODAR etc is very important
Demonstration platforms or prototype farms are required for offshore wind specific technology development and long term cost competitiveness of offshore wind. This is similar to land based turbine testing at NREL and UKs (public-private) initiative to have 100MW offshore wind farm available for prototyping and testing.
CHALLENGES and OPPORTUNITIES
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Static strength testing and accelerated fatigue testing of wind turbine blades are required for Turbine certification Reduce the risk of widespread failuresImprove blade reliabilityReduce COEBlades over 50m can not be fatigue tested in the United StatesBlades 62m long are in production and longer blades are being designedThis project will reduce COE by Reducing frequency of blade failuresLowering machine costIntroducing more efficient bladesReducing technical and financial risk of large-scale deploymentProviding industry with low cost test facilities to comply with certification requirements and support value engineering
BLADES - Statement of the ProblemSlide courtesy of Jason Cotrell of NREL
Chart3
91989
199319
1934
241999
372002
50.752004
200550
61.52006
NWTC IUF Blade Test Facility built for blades up to 34m
NWTC Blade Test Facility modified to test blades up to 50m
.1 MW
.5 MW
.75 MW
3.6 MW
5 MW
1.5 MW
7 MW Clipper Offshore)
Blade Length (m)
Sheet1
Onshore Blade LengthOnshore Rating (MW)Offshore Blade LengthOffshore Rating (MW)Onshore & Offshore Blade LengthsBlade Test FacilitiesLM
198990.190.1198814.5
199319251
1996190.5190.534IUF199821
1999240.75240.75200233
2002371.5371.5200462.5
2004452.5513.6512.5
200550IUF
2006625625
PROJECTIONS
402.1151431027
503.3049110979
604.759071981
706.4776257519
808.4605724106
9010.7079119572
10013.2196443916
Sheet1
NWTC IUF Blade Test Facility built for blades up to 34m
NWTC Blade Test Facility modified to test blades up to 50m
.1 MW
.5 MW
.75 MW
3.6 MW
5 MW
1.5 MW
7 MW Clipper Offshore)
Blade Length (m)
Sheet2
NWTC IUF Blade Test Facility built for blades up to 34m
NWTC Blade Test Facility modified to test blades up to 50m
.1 MW
.5 MW
.75 MW MW
3.6 MW
5 MW
1.5 MW
Blade Length (m)
Sheet3
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Development of Test EquipmentProcuring a state of the art hydraulic based static test system from MTSWorking with MTS to scale up NREL UREX Fatigue Test SystemDesigning and procuring a new generation of the NREL data acquisition hardwareDeveloping a new version of data acquisition software
Schematic of MTS Static Test SystemCourtesy of MTS websiteTechnical ApproachSlide courtesy of Jason Cotrell of NREL
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Picture courtesy of MTS and NRELStatic and Fatigue TestingLatest hydraulic actuators/winches will allow matching various specified bending moment distributions.
Dual-axis resonant test system (NREL patent pending)
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THANK YOU
*****
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