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DESIGN OF A SEMI-SUBMERSIBLE FLOATING VAWT WITH ACTIVE BLADE PITCH CONTROL17 JANUARY 2018, TRONDHEIMFons Huijs
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DESIGN OF A SEMI-SUBMERSIBLE FLOATING VAWT WITH ACTIVE BLADE PITCH CONTROL17 JANUARY 2018, TRONDHEIMFons Huijs, Ebert Vlasveld, Maël Gormand GustoMSC
Feike Savenije, Marco Caboni ECN
Bruce LeBlanc, Carlos Simao Ferreira TU Delft
Koert Lindenburg WMC
Sébastien Gueydon, William Otto MARIN
Benoît Paillard EOLFI
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OUTLINE• Introduction
• Floating VAWT design
• Coupled analysis
• Conclusions
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INTRODUCTION – FLOATING VAWT • Deeper waters
• Larger wind turbines
Increasing interest for floating wind
• Low centre of gravity position
• Large allowable tilt angle
• Potential for scaling up
VAWT promising for floating
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INTRODUCTION – PREVIOUS WORK
Technip, NenupharCahay et al, OTC 21704, 2011
DeepWind projectPaulsen et al, DeepWind’2013
GustoMSC, TU DelftBlonk, MSc thesis, 2010
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INTRODUCTION – S4VAWT PROJECT• Active blade pitch control for VAWT
• Improved aerodynamic efficiency (power production)
• Lower wind loads above rated (power production)
• Lower survival loads (parked)
• Objectives S4VAWT project:
• Verify & quantify VAWT advantages
• Design semi-submersible floater
• Verify design by simulations
S4VAWTSemi-Submersible Support Structure
for Vertical Axis Wind Turbines
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DESIGN – BASIS• 6 MW VAWT
• Maximum static tilt during production < 10
• French Mediterranean Sea
• Water depth 100 m
• 50-year significant wave height 6.5 m
• DNV GL standards
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DESIGN – 6 MW VAWT • Active blade pitch control
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DESIGN
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DESIGN
14
0 m
63 m
33 m
Tri-Floater1700 t
6 MW VAWT17700 m2 rotor area
550 t
Water ballast400 t
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COUPLED ANALYSIS – SOFTWARE• Aerodynamics: Lifting line free vortex wake method
• Turbine and control: Structural dynamics, gyroscopic effects, etc.
• Hydrodynamics: Potential flow, full QTF, quadratic damping
• Mooring: Dynamic lumped-mass model
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COUPLED ANALYSIS – MOTION RESULTS Rated Cut-out Survival
10-min mean wind velocity [m/s] 11 25 39
Significant wave height [m] 4.0 5.4 6.5
Floater surge [m] mean 42 39 42
max 46 43 51
Floater tilt (roll & pitch) [deg] mean 7 3 2
max 11 6 5
Floater yaw [deg] mean 5 6 0
max 8 9 6
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COUPLED ANALYSIS – PARKED SURVIVAL
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CONCLUSIONS – FLOATING VAWT DESIGN• Active blade pitch control makes design drivers
floater for VAWT more similar to HAWT:
• Rated wind governing for floater tilt & tower
base moment
• Parked survival still governing for surge &
mooring tensions
• Yaw induced by rotor torque no issue for
Tri-Floater
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CONCLUSIONS – VAWT • Known advantages VAWT for floating wind:
• Low centre of gravity position
• Large allowable tilt angle
• Potential for scaling up
• Active blade pitch control:
• Mitigate large loads above rated and parked
• Floater for VAWT 20% lighter than for HAWT
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THANK YOU FOR YOURKIND ATTENTION17 JANUARY 2018, TRONDHEIM
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