Diese Präsentation wurde erfolgreich gemeldet.
Die SlideShare-Präsentation wird heruntergeladen. ×

Ribeiro carla

Anzeige
Anzeige
Anzeige
Anzeige
Anzeige
Anzeige
Anzeige
Anzeige
Anzeige
Anzeige
Nächste SlideShare
ECTC Presentation
ECTC Presentation
Wird geladen in …3
×

Hier ansehen

1 von 29 Anzeige
Anzeige

Weitere Verwandte Inhalte

Ähnlich wie Ribeiro carla (20)

Anzeige
Anzeige

Ribeiro carla

  1. 1. An investigation into turbine performance and wind flow modelling under cold weather driven stable atmospheric conditions Winterwind 2013 (Östersund, Sweden - 13 February 2013)
  2. 2. GL Garrad Hassan – Independent Renewable Experts Almost 1000 staff, in 44 locations, across 26 countries Heerenveen Sint Maarten Kaiser-Wilhelm- Koog Glasgow Copenhagen London Hinnerup Slough Oldenburg Bristol Hamburg Beijing Vancouver Cork Warsaw Seoul Paris Imola Ottawa Tokyo Portland Lisbon Izmir Shanghai San Diego Barcelona Cairo Mumbai Zaragoza Montreal Madrid Bangkok Peterborough Bangalore Austin Singapore Querétaro Newcastle Porto Alegre Wellington Santiago Cape Town Melbourne
  3. 3. Content Cold climate driven stable atmospheric conditions in the Nordic Region: 1 - Consequences to the wind flow (challenges) and how it translates 2 - How complex CFD flow modelling can help with the wind flow modelling challenges 3 - Impact of high frequency of stable atmospheric conditions on turbine performance
  4. 4. 1 –2–3 Stable atmospheric conditions What is it and how it translates
  5. 5. Radiative cooling driven stable atmospheric conditions - Unstable, neutral, stable and very stable atmospheric conditions - Actual - Dry-adiabatic - High frequency of stable atmospheric conditions
  6. 6. Radiative cooling driven stable atmospheric conditions - When do stable and very stable atmospheric conditions happen in the Nordic region
  7. 7. Radiative cooling driven stable atmospheric conditions - When do stable and very stable atmospheric conditions happen in the Nordic region
  8. 8. Radiative cooling driven stable atmospheric conditions - When do stable and very stable atmospheric conditions happen in the Nordic region
  9. 9. Radiative cooling driven stable atmospheric conditions - When do stable and very stable atmospheric conditions happen in the Nordic region
  10. 10. Radiative cooling driven stable atmospheric conditions - When do stable and very stable atmospheric conditions happen in the Nordic region
  11. 11. Radiative cooling driven stable atmospheric conditions - When do stable and very stable atmospheric conditions happen in the Nordic region
  12. 12. Radiative cooling driven stable atmospheric conditions - When do stable and very stable atmospheric conditions happen in the Nordic region
  13. 13. Radiative cooling driven stable atmospheric conditions - When do stable and very stable atmospheric conditions happen in the Nordic region
  14. 14. Radiative cooling driven stable atmospheric conditions - When do stable and very stable atmospheric conditions happen in the Nordic region
  15. 15. Radiative cooling driven stable atmospheric conditions - When do stable and very stable atmospheric conditions happen in the Nordic region
  16. 16. High frequency of stable atmosphere and wind conditions Low TI as a proxy for stable atmospheric conditions
  17. 17. Wind Flow modelling challenges Wind speed at mast A/Wind speed at mast B = Speedup 1.10 1.05 1.00 0 30 60 90 120 150 180 210 240 270 300 330 0.95 Speedup 0.90 0.85 0.80 0.75 0.70 0.65 Direction Sector (deg) Stable Unstable Total
  18. 18. 1– 2 –3 Complex CFD flow modelling for stable wind flow challenges
  19. 19. What is CFD (Computational Fluid Dynamics) • Most accurate description of wind flow: Navier-Stokes Equations (below) • Very difficult to solve! • Linear models simplify this equation - some accuracy is sacrificed • CFD makes fewer changes – less loss of accuracy: • Reynolds-Average Navier-Stokes (RANS) • Advanced software required • Modern computing power required • Like a wind tunnel on your computer
  20. 20. Wind Flow modelling under stable conditions Directional speedup errors (95 mast pairs at 16 sites) Neutral CFD Linear (WAsP)
  21. 21. Stable + Neutral CFD approach (GL GH approach) Directional speedup errors (95 mast pairs at 16 sites) Stable+Neutral Average Errors error is lower Linear (WAsP) = 9.6% Neutral CFD = 9.5% Stable + Neutral (CFD) = 6.6%
  22. 22. 1– 2 – 3 High frequency of stable conditions and turbine performance
  23. 23. Performance of wind turbines under stable conditions in the Nordic Region – What the theory suggests P = 1/2ρ(u)3(1+3TI2)ACp 2000 1500 Power (KW) 0% 5% 1000 10% 15% 20% 500 0 2 4 6 8 10 12 14 Wind speed (m/s)
  24. 24. Performance of wind turbines under stable conditions in the Nordic Region Results for IEC Power Curve Measurements of 5 mast/turbine pairs in Sweden 106% measured power curve production 104% 102% Low TI / High TI T1 100% T2 No partial icing cleaning 98% T3 and no temperature 96% T4 filtering T5 94% Average 92% 6 7 8 Annual mean wind speed (m/s)
  25. 25. Performance of wind turbines under stable conditions in the Nordic Region Results for IEC Power Curve Measurements of 5 mast/turbine pairs in Sweden 106% measured power curve production 104% 102% Low TI / High TI T1 100% T2 Data cleaned for partial 98% T3 icing and filtered 96% T4 excluding temperatures T5 below 0˚C 94% Average 92% 6 7 8 Annual mean wind speed (m/s)
  26. 26. Performance of wind turbines under stable conditions in the Nordic Region Results for IEC Power Curve Measurements of 5 mast/turbine pairs in Sweden 106% measured power curve production 104% 102% Low TI / High TI T1 100% T2 Data cleaned for partial 98% T3 icing and filtered 96% T4 excluding temperatures T5 below 0˚C and different 94% Average site calibration speedups 92% applied for stable and 6 7 8 Annual mean wind speed (m/s) unstable conditions
  27. 27. Performance of wind turbines under stable conditions in the Nordic Region Results for IEC Power Curve Measurements of 5 mast/turbine pairs in Sweden Without different site calibration speedups With different site calibration speedups 110% 110% 105% 105% measured power curve measured power curve 100% 100% Low TI / High TI Low TI / High TI 95% 95% 90% 90% 85% 85% 80% 80% 4 5 6 7 8 9 10 11 12 13 14 15 16 17 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Wind speed (m/s) Wind speed (m/s) T1 T2 T3 T4 T5 Average T1 T2 T3 T4 T5 Average
  28. 28. Conclusions There is high frequency of stable and very stable atmospheric conditions in sites across the Nordic Region caused by radiative cooling This presents a challenge for both wind flow modelling and turbine performance Stable CFD reduces the error in wind flow modelling at these sites Theory shows that low turbulence reduces turbine performance in raising part of the power curve Preliminary Nordic data supports this, however shows recovery in the “knee” of the power curve Need to gather more Power Curve Measurement data across the Nordic region Careful consideration should be given to winter Power Curve Measurement data, as partial icing affects more low TI data than high TI, and the anemometry used Site calibration speedups for stable and unstable conditions should be considered separately as suggested by the new draft of the IEC standard
  29. 29. Thank you Any questions? Contact: Carla Ribeiro, Senior Team Leader Nordic Region carla.ribeiro@gl-garradhassan.com With Thanks to: Simon Cox Bob Hodgetts Andrew Tindal GL GH CFD Team GL GH AMOS Team

×