The Proven 15 kW turbine; designed for reliability and performance

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Presentation transcript:

The Proven 15 kW turbine; designed for reliability and performance EWEC Athens 2006, CW32. Small wind turbine systems. Proven Energy Ltd., Johnnie Andringa www.provenenergy.com

Next 15 minutes Products & company Turbine design & safety 15 kW blade development Blade material Moulds and process Blade tests Further Development Turbine performance Status

Products First turbine Rannoch Moor, now, 17 years later still up & running 2.5 and 6 kW Transition from off-grid to on-grid Household and professional customers

Company Based in Scotland; high winds and many remote islands Export to over 30 countries 2005; 150 turbines, growing over 50% year on year

Turbine design Simplicity: reliability Direct drive PM generator, no rotating coil Brake disk Downwind, passive yaw Low rpm; tip speed < 65 m/s; low noise

Safety mechanism Passive pitch: elastic hinge with prestressed springs Blades cone downwind

15 kW development Same concepts as smaller turbines Basic numbers: 9.5 m diameter 95 …160 rpm rated 11 m/s Blade: twintex; 15 kg each Development started 3 years ago

Blade development 2.5 kW; full PolyPropylene as blade material Tough and non-sticky 6 kW; wood epoxy Manufacturing of larger shapes Vulnerable (impact) 15 kW started with glass-epoxy ended with twintex (Glass with PP matrix) As above and ‘recyclable’; melt PP from glass However; ‘NEW’ material and process

Moulds Elevated temperature; expensive moulds

Process Filling of mould Blade has a rib Vacuum forming in oven

Blade testing Hinged blade; low bending moments (IEC) Static tensile & bending test Same design, same mould Improvements in production Over 3-fold increase in critical strength More consistent quality

Further development Hub, Generator, Controller, Automatic brake Covers are designed; styling of turbine

Turbine Performance Theoretical / experimental analysis of springs Optimise power curve and safety mechanism

Status PERFORMANCE was achieved early Establishing RELIABILITY took longer, especially with new production process Now entering final 6 months live cycle test Full scale production starts 2007 IEC 61400/2 standard and procedures helpful