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Investigation of the Stability Bounds of Wind Turbines in view of Passive Instability Suppression

V.A.Riziotis and S.G.Voutsinas National Technical University of Athens School of Mechanical Engineering Fluids Section. E.S. Politis and P. K. Chaviaropoulos Centre for Renewable Energy Sources Wind Energy Section.

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Investigation of the Stability Bounds of Wind Turbines in view of Passive Instability Suppression

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  1. V.A.Riziotis and S.G.Voutsinas National Technical University of Athens School of Mechanical Engineering Fluids Section E.S. Politis and P. K. Chaviaropoulos Centre for Renewable Energy Sources Wind Energy Section Investigation of the Stability Bounds of Wind Turbines in view of Passive Instability Suppression EWEC’06 Athens 27 February-2 March 2006

  2. Overview of the Presentation

  3. isolated blade analysis 1st flap 2% improvement in power production 1st lead-lag

  4. full wind turbine analysis

  5. 2nd cyclic flap 1st cyclic lead-lag 1st flap

  6. 2nd cyclic flap 1st cyclic lead-lag 1st flap

  7. Reference 2nd cyclic flap 1st cyclic lead-lag regressive lead-lag mode shape 1st flap modified 2

  8. isolated blade analysis 1st lead-lag mode FOIL2W: 2D viscous-inviscid interaction model wind speed 12m/s

  9. introduction of a soft connection of the nacelle with the tower kyaw = 5x105 Nm/rad

  10. Effect from the introduction of a soft yaw connection on the damping of the rotor lead-lag modes Application to a Pitch-Variable Speed wind turbine

  11. 2nd flap 1st lag 2nd flap 1st lag Reference regressive lead-lag mode shape soft yaw

  12. Effect from the introduction of a soft yaw connection on the damping of the rotor lead-lag modes Application to an Active Stall wind turbine

  13. Conclusions

  14. Acknowledgements • European Commission & Greek Secretariat for Research and Technology for co-funding this work under contract NNK5-CT2002-00627 (STABCON project) • STABCON project partners for publishing of the paper

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