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RELIABILITY OF OFFSHORE WIND TURBINES

RELIABILITY OF OFFSHORE WIND TURBINES. Identifying risks by onshore experience. S. Faulstich , B. Hahn, P. Lyding (Fraunhofer IWES) P.J. Tavner (Durham University). RELIABILITY OF OFFSHORE WIND TURBINES. Motivation Sources of onshore experience Identified risks Conclusions Outlook.

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RELIABILITY OF OFFSHORE WIND TURBINES

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  1. RELIABILITY OF OFFSHORE WIND TURBINES Identifying risks by onshore experience S. Faulstich, B. Hahn, P. Lyding (Fraunhofer IWES) P.J. Tavner (Durham University)

  2. RELIABILITY OF OFFSHORE WIND TURBINES • Motivation • Sources of onshore experience • Identified risks • Conclusions • Outlook

  3. Motivation • Onshore: • high availability • a number of faults cause unplanned down times • high maintenance efforts and costs • Offshore: drop of availability expected

  4. Motivation

  5. Sources of onshore experience

  6. Sources of onshore experience

  7. General results

  8. General results

  9. Identified risks

  10. Identified risks

  11. Identified risks Failure rate vs. turbine size (Durham University, LWK) Failure rate vs. technical concept (IWES, WMEP)

  12. Identified risks Correlation between Wind energy index and failure rate (Durham University, LWK) Wind speed dependancy of failure rate (IWES, WMEP)

  13. Conclusions • Reliability of wind turbines has to get improved • Characteristics of failures differ strongly • Numerous small failures • Small number of large failures with long downtimes • Trends can be recognised

  14. Conclusions • Risk one: small number of large failures, complicated repair  increasing duration of downtimes • Risk two: Numerous small failures, complicated access increasing duration of downtimes • Risk three: Large WTs with more complex technical concepts increasing number of failures • Risk four: Higher wind speeds increasing number of failures • Risk five: Additional stress through climatic conditions and wave loads  increasing number of failures

  15. Outlook The generation of a common database -aims to help in answering essential questions concerning offshore wind energy -contribute to political decision-making processes and facilitate further technological progress -allows anonymous benchmarking and weak-point analyses -gives the possibility to test and, if necessary, optimize the performance of offshore wind farms Poster PO.71

  16. Thank you for your attention, Visit us at stand B0311 Dipl.-Ing. M.Sc. Stefan Faulstich Reliability and maintenance strategies R&D Division Energy Economy and Grid Operation Fraunhofer IWES

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