stability limits for a full wind turbine equipped with trailing edge systems
DESCRIPTION
Stability limits for a full wind turbine equipped with trailing edge systems. by Thomas Buhl, Mac Gaunaa, Leonardo Bergami and Peter B. Andersen. Outline. Motivation 2D stability 3D stability Results Conclusion. Motivation. Complex terrain CFD by Dr. Bechmann Risø. Siemens Wind power. - PowerPoint PPT PresentationTRANSCRIPT
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Stability limits for a full wind turbine equipped with trailing edge systems
by Thomas Buhl, Mac Gaunaa, Leonardo Bergami and Peter B. Andersen
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17/04/2009EWEC 20092
Outline
• Motivation• 2D stability• 3D stability• Results• Conclusion
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17/04/2009EWEC 20093
Motivation
Complex terrain CFD by Dr. Bechmann Risø
Siemens Wind power
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17/04/2009EWEC 20094
Motivation
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17/04/2009EWEC 20095
Adaptive trailing edges
From 2003 to today: three large research projectsinvolving more than 10
researchers,6 master thesis and 3 Ph.d’s
Inspiration Not applicable!
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17/04/2009EWEC 20096
Typical turbine layout
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17/04/2009EWEC 20097
Controller
”aerodynamic” controller part
”elastic” controller part
”pitch” controller part
”power” controller part
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17/04/2009EWEC 20098
Motivation
Load reduction on Upwind turbine – by P. B. Andersen
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17/04/2009EWEC 20099
Wind tunnel results
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17/04/2009EWEC 200910
2D stability
2D stability results from L. Bergami and M. Gaunaa
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17/04/2009EWEC 200911
Full turbine stability Results-Original turbine no flaps
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17/04/2009EWEC 200912
Full turbine stability Results-Original turbine with and without flaps
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17/04/2009EWEC 200913
Moving the center of gravity
Figures made by Li Na in ADAPWING2 project funded by Danish Research Council
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17/04/2009EWEC 200914
Moving the center of gravity
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17/04/2009EWEC 200915
2D Stability-Moving the center of gravity
From: Hansen, M.H., Aeroelastic instability problems for wind turbines.
Wind Energy (2007) 10 , 551-577
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17/04/2009EWEC 200916
Moving the center of mass
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17/04/2009EWEC 200917
Full turbine stability Results-Moving the center of gravity
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17/04/2009EWEC 200918
Full turbine stability Results-Moving the center of gravity
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17/04/2009EWEC 200919
Conclusions• Results from 2D studies show that adding flap control generally lowers
the stability limits• Results from 2D show that the effects of adding elastic trailing edges are
not trivial. Possibility of drastically lowered flutter velocities.
• The reference turbine is very stable.• The full turbine results show that the critical tip speed for which instability
occurs is lower for turbines equipped with trailing edge flaps compared to the turbine without.
• In most of the instability cases found an artificial propeller mode (large forward blade deflections) occurs.
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17/04/2009EWEC 200920
Future work
• Emergency stop• future extensions to this work should focused also on the controller
parameters and the influence of these on the stability limits– Elastic flaps– Aggresivily tuned flap control – Less stable reference turbine
• This work is partially funded by
Acknowledgement