Lead Session Chair:
Stephan Barth, Managing Director, ForWind - Center for Wind Energy Research, Germany
Andreas Reuter (1) F P Jan Wenske (1)
(1) Fraunhofer IWES, Hannover, Germany
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Accelerated validation of offshore turbines
Over the past 10 years Fraunhofer IWES has developed a comprehensive infrastructure and testing experience for the accelerated validation of large wind turbines (WT).
Reliability and availability of all technical systems in offshore wind turbines are essential for keeping the promise of a lower cost of energy while introducing a new generation of 6+MW turbines. In spite of the diversity of existing rotor, drive train, control system and support structure concepts, challenges regarding reliability and validation of properties remain the same.
To address the complexity of such industrial products, Fraunhofer IWES developed a tailored version of the V-Development model which includes an inherent process of validation of properties across the whole development process through testing.
Main body of abstract
To bring testing conditions and load profiles as close as possible to real-world field conditions, so as to bridge the gap between standard material testing and field test for wind turbine, IWES tests rotor blades of up to 90 m in length on two test rigs and perform pitch bearing tests, static testing as well as uniaxial and biaxial full scale cyclic testing in order to gain data for operational stability analysis within a time frame of a few months. Qualification of composite substructures and materials complete the IWES profile. The unique testing infrastructure has enabled the development of competences and methods for accelerated fatigue testing. Processes and tools to validate simulation by tests include root cause analysis in case of failure and advanced methods of online monitoring and site assessment (e.g. 3D-seismic scanner, LIDAR buoy).
IWES has also developed a Dynamic Nacelle testing Laboratory (DyNaLab) for the validation of complete turbine nacelles, using a combination of 10 MW direct-drive, a 6 DOF hexapod load application unit, the so called “virtual rotor” and an artificial medium voltage grid emulator which creates maximum flexibility on grid code testing including inter-park effect emulation used for model validation, accelerated lifetime testing and complete electrical certification.
A specialised test centre for offshore support structures enables focussed testing of soil-structure interaction, fatigue behaviour and construction methods.