Comparison of binned and Gaussian Process based wind turbine power curves for condition monitoring purposes

Ravi Kumar Pandit, David Infield

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Performance monitoring based on available SCADA data is a cost effective approach to wind turbine condition appraisal. A power curve of a wind turbine describes the relationship between power output and wind speed and is a key measure of wind turbine performance. The standard IEC method calculates a binned power curve from extensive measured data, however this approach requires an extended measurement period in order to limit the uncertainty associated with the calculated power curve, and is far too slow to be used directly for condition monitoring where any changes in operation need to be identified quickly. Hence an efficient approach needs to be developed to overcome this limitation and be able to detect anomalies quickly, thus detecting damage at an early stage so as to prevent catastrophic damage. A Gaussian Process (GP), which is a non-parametric machine learning approach, has the potential fit power curves quickly and effectively. This paper deals with the application of a Gaussian Process to power curve fitting and anomaly detection. This is compared with the conventional approach based on a binned power curve together with individual bin probability distributions to identify operational anomalies. The paper will outline the advantages and limitations of the Gaussian Process approach.
Original languageEnglish
Number of pages12
JournalJournal of Maintenance Engineering
Publication statusPublished - 1 Sept 2018
EventSecond International Conference on Maintenance Engineering (IncoME 2017) - University of Manchester, Manchester, United Kingdom
Duration: 5 Sept 20176 Sept 2018


  • wind turbines
  • Gaussian process
  • condition monitoring
  • power curve
  • curve fitting
  • anomaly detection
  • turbine performance


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