Economic analysis of condition monitoring systems for offshore wind turbine sub-systems

Allan May, David McMillan, Sebastian Thöns

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)
116 Downloads (Pure)


The use of condition monitoring systems on offshore wind turbines has increased dramatically in recent times. However, their use is mostly restricted to vibration based monitoring systems for the gearbox, generator and drive train. A survey of commercially available condition monitoring systems and their associated costs has been completed for the blades, drive train, tower and foundation. This paper considers what value can be obtained from integrating these additional systems into the maintenance plan. This is achieved by running simulations on an operations and maintenance model for a wind farm over a 20 year life cycle. The model uses Hidden Markov Models to represent both the actual system state and the observed condition monitoring state. The CM systems are modelled to include reduced failure types, false alarms, detection rates and 6 month failure warnings. The costs for system failures are derived, as
are possible reductions in costs due to early detection. The detection capabilities of the CM systems are investigated and the effects on operational costs are examined. Likewise, the number of failures detected 6 months in advance by the CM systems is modified and the costs reported.
Original languageEnglish
Number of pages8
JournalIET Renewable Power Generation
Early online date12 Oct 2015
Publication statusPublished - 2015


  • maintenance and reliability
  • wind turbines
  • failure analysis
  • condition monitoring
  • structural health monitoring

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