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Technology developments and RD landscape: Research overview from Ris

Wind Energy Division - Ris

whitney
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Technology developments and RD landscape: Research overview from Ris

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    1. Technology developments and R&D landscape: Research overview from Risř

    2. Wind Energy Division - Risř DTU Technical University of Denmark

    3. ”Wind Energy Roadmap” in the EC Communication of Financing Low Carbon Technologies.

    4. Research, development and demonstration challenges – Danish MEGAVIND strategy

    8. Wind Energy Division - Risř DTU Technical University of Denmark

    9. Risř DTU – Offshore Wind Energy R&D priorities Marine wind, wave and current conditions Characterize the geophysical processes,estimate local conditions and develop design basis Wakes in offshore wind turbine farms Characterize and model wakes (performance and loads) in relation to interaction between turbines, between farms and large scale climate effects Installation and maintenance Methods, models and tools to support installation and maintenance incl. Wind wave prediction, remedial and preventive maintenance and condition monitoring Integrated design tools Integrated aero-hydro-servo-elastic tools incl. wave loads,soil-structure and fluid-structure interaction Offshore wind integration Models and tools for design and control of offshore grid and clusters New concepts

    10. Offshore Wind Conditions • Ocean winds • Lidar observations and modelling • Wind resource mapping using satellite data • Mesoscale modelling • Meteorological mast observations • Wind farms shadow effect • Satellite observations

    11. Horns Rev offshore site

    12. Wind loads dominated by wake effects

    13. Fuga – a new, linearized wake model Solves linearised RANS equations Closure: mixing length, k-e or ’simple’ (nt=ku*z) Fast, mixed-spectral solver using pre-calculated look-up tables (LUTs) No computational grid, no numerical diffusion, no spurious mean pressure gradients Integration with WAsP: import of wind climate and turbine data. 105 times faster than conventional CFD!

    14. User friendly GUI

    15. Validation: Horns Rev I.

    16. Validation: Nysted.

    17. Downwind Speed Recovery FUGA - predicts a much ”slower” speed recovery than standard wake models. For HR rec.distance is about 16 km; somewhat slower than observed 4)

    18. Design of offshore wind turbines Offshore wind turbines are not onshore wind turbines! hydrodynamic loads, sea ice, long periods at standby Offshore wind turbines are not oil rigs! wind loads, shallow water, dynamics, unmanned Marriage of expertise from wind power and offshore engineering industries Technology Risks Improve confidence with which offshore wind farms can be financed and implemented

    19. Standards for Offshore Wind Turbines Onshore wind turbines IEC 61400-1, Edition 3 Offshore wind turbines IEC 61400-3 GL Regulations for Offshore WECS, 1995 DNV, Design of Offshore Wind Turbine Structures, OS-J101, 2007 GL Wind, Guideline for the Certification of Offshore Wind Turbines, 2005 Offshore structures – petroleum and natural gas industries ISO 19900, General Requirements for Offshore Structures, 2002 ISO 19901, Specific Requirements for Offshore Structures, 2003 ISO 19902, Fixed Steel Offshore Structures, 2004 (DIS) ISO 19903, Fixed Concrete Offshore Structures, 2004 (DIS)

    20. Walney Offshore Wind Farm Project

    21. EUDP Walney Offshore Wind Farm Project Measurements: Nacelle mounted LIDAR measuring wind speed at 2.5 rotor diameter in front of turbine. Wave and current measurements near foundation

    22. Benefits from the project and its need Maturity of loads prediction on offshore wind turbines, both on the support structure, as well as rotor nacelle. Provides offshore turbine loads data for research purposes. Provides for correlated wind and wave measurements for each load data point. One of the very few nacelle mounted LIDARs for offshore wind turbines with accurate wind measurements Cost effective foundations. Improved accuracy for site specific loads prediction Estimation of damping of the structure to mitigate fatigue and extreme loads Long term loads on the foundations Fatigue and ultimate strength requirement evaluations Enables improved life prediction

    23. DEEPWIND – New EU Funded Program

    24. Combined floating wind- and wave energy converter – Poseidon Experiment

    25. Poseidon: Modeling Challenges Risř Hawc2 Overview Three rotors in one simulation Structural modeling already possible in the multi-body formulation Aerodynamic model updated to handle this Wake from upwind rotors Already possible with the dynamic wake meandering model in HAWC2

    26. The development of offshore wind energy depends not only on industrial development and demonstration –but also on medium to long term research Site conditions very complex – the site specific design conditions are derived in an ad-hoc and pragmatic way Integrated design tools exist but are primarily used to demonstrate conservatism of approach Limited validation of design loads and response Deep water (> 30 m) is a challenge Deep water concepts under way Offshore wind is just at the beginning – all options are open Conclusions

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