UniTTe Workshop 2016

Friday 18 Nov 16


Rozenn Wagner
Senior Researcher
DTU Wind Energy
+45 46 77 59 50

Project partners and members of the advisory board have presented last development, experience and challenges of using nacelle lidars for wind turbine power performance measurement and loads assessment.

Power performance verification is nowadays mainly required for new types of wind turbine (e.g. very large offshore.turbines) and challenging environment (e.g. complex terrain). Nacelle lidars are already broadly used for power performance verification offshore as it reduces significantly the cost compared to erecting a met mast for this purpose. There is however a need to increase the investors’ confidence in these new type of measurements to be able to substitute met masts. This raises the need for a standard especially to have a common understanding of the uncertainties.

Avoiding the use of met mast raises other questions such as the local measurement of other wind characteristics such  as shear, veer and turbulence required for full characterisation of the turbine power and loads.

Power performance verification in complex terrain needs a new approach which would overcome the main issue of the current method relating wind speed measured at 2.5D upstream to the wind speed at the turbine position.

The UniTTe project is addressing those challenges through:

  • the development of a power performance verification method based on short range nacelle lidar measurements in order have a better estimate of the wind at the turbine position (free wind)
  • the characteristation of the induction zone with a simple model
  • derivation of turbulence characteristics from nacelle lidars;
  • implementation and evaluation of loads assessment based on nacelle lidar measurements instead of met mast measurements.

More details on those topics can be found in the workshop presentations:

  1. Presentation of the UniTTe project - R. Wagner (DTU)
  2. Generic methodology for field calibration of (nacelle-based) lidars and uncertainties - A. Borraccino ( DTU), M. Courtney (DTU)
  3. Wind turbine inflow: Comparison of CFD and WindScanner measurements – A. R. M. Forsting (DTU), N. Troldborg (DTU)
  4. Measurement campaign in flat terrain, Nørrekær Enge, June- December 2015 - A. Vignaroli (DTU)
  5. Vinfinity is found – A. Borraccino (DTU)
  6. Proposal for a new IEC standard - R.Wagner (DTU)
  7. Turbulence characterization from forward-looking nacelle-lidar measurements - A. Peña (DTU)
  8. Constrained Simulation of normal turbulence operation with embedded profiles from Lidar measurement - N. Dimitrov (DTU)
  9. Validation of Simulated loads on the Siemens 2.3 MW with Met Mast data - A. Natarajan (DTU)
  10. The induction zone in complex terrain - A. R. M. Forsting (DTU), N. Troldborg (DTU)
  11. Complex terrain measurement campaign, Hill of Towie, November 2016- January 2017.- A. Vignaroli (DTU)
  12. Nørrekær Enge UniTTe campaign – a ZephIR lidar perspective – C. Slinger (ZephIR Lidar)
  13. Nacelle LiDAR Activities in RES – SFeeney (RES)
  14. Complications with implementing Nacelle LIDAR PCV on V164 – T.Hald (MHI Vestas)
  15. Measurements with Nacelle LIDAR at large distance – B.M.Christensen (Vestas)
  16. EDF Projects Overview – H.Hermann (EDF R&D UK Center)
23 JANUARY 2018