case study on vawt certification - intertek · case study on vawt certification alistair mackinnon...
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Case study on VAWT certification
Alistair MackinnonOperations Manager Wind Energy
TUV SUD NEL Ltd(Formerly the UK’s National Engineering Laboratory)
Myres HillNational Wind Energy CentreNational Wind Energy Centre
(Supported by DECC & NMS)
‘The most important thing in communication is hearing what communication is hearing what
isn’t being said ….. ’
Accreditation(UKAS/A2LA etc)MLA
Landscape
TestingISO 17025
CertificationEN 45011/Guide 65
Standards
BWEA Standard
British Wind Energy Association Small Wind Turbine Performance and Safety Standard
29 February 2008
Section 2 Section 3 Section 4 Section 5Section 2Power
Performance
BS EN 61400-12-1:2006
Section 3Acoustic
Sound Testing
BS EN 61400-11:2003IEC 61400-14:2005
Section 4Strength and
Safety
BS EN 61400-2:2006
Section 5Duration
BS EN 61400-2:2006
Darrieus – H type
Wind Direction
Darrieus – Phi type
Darrieus – Delta type
Darrieus – Helical type
Savonius type
A A
Wind Direction
• Static loading – generally constant
• Cyclic loading – quasi static & dynamic cycling
• Stochastic loading – random variations
• Aerodynamic loading – force of the wind
• Mechanical loading – gravity, gyroscopic, transient
• IEC 61400-2: 2006 requires an aeroelastic approach
• No simplified load model for VAWTs hence no standard design filedesign file
• large number of load cases
• differences in the software implementation
• challenging for both the designer and CB – guidance is at best vague
• power performance issues – self start (savonius) or ‘motored’ up consequences for AEP
• issues in duration – net positive power flow….. • issues in duration – net positive power flow…..
• safety and function – dynamic behaviour observations
• supporting structure – currently excluded
• braking, shutdown and protection
• Power production• Power production plus occurrence of fault• Normal shut down• Emergency or manual shutdown
Aeroelastic load cases
• Emergency or manual shutdown• Parked (standing still or idling)• Parked and fault condition• Transport, assembly, maintenance and repair
‘The most important thing in communication is hearing what communication is hearing what
isn’t being said………… ’