Advances in the Assessment of Wind Turbine Operating Extreme Loads via More Efficient Calculation Approaches

Peter Graf, Jason Jonkman, Rick Damiani, Katherine Dykes

Research output: Contribution to conferencePaperpeer-review

8 Scopus Citations


A new adaptive stratified importance sampling (ASIS) method is proposed as an alternative approach for the calculation of the 50 year extreme load under operational conditions, as in design load case 1.1 of the the International Electrotechnical Commission design standard.1 ASIS combines elements of the binning and extrapolation technique, currently described by the standard, and of the importance sampling (IS) method to estimate load probability of exceedances (POEs). Whereas a Monte Carlo (MC) approach would lead to the sought level of POE with a daunting number of simulations, IS-based techniques are promising as they target the sampling of the input parameters on the parts of the distributions that are most responsible for the extreme loads, thus reducing the number of runs required. We compared the various methods on select load channels as output from FAST, an aero-hydro-servo-elastic tool for the design and analysis of wind turbines developed by the National Renewable Energy Laboratory (NREL). Our newly devised method, although still in its infancy in terms of tuning of the subparameters, is comparable to the others in terms of load estimation and its variance versus computational cost, and offers great promise going forward due to the incorporation of adaptivity into the already powerful importance sampling concept.

Original languageAmerican English
Number of pages19
StatePublished - 2017
Event35th Wind Energy Symposium, 2017 - Grapevine, United States
Duration: 9 Jan 201713 Jan 2017


Conference35th Wind Energy Symposium, 2017
Country/TerritoryUnited States

Bibliographical note

Publisher Copyright:
© 2017, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

NREL Publication Number

  • NREL/CP-2C00-67470


  • extreme load
  • load calculation
  • wind turbines


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