Comparative fatigue life assessment of wind turbine blades operating with different regulation schemes

Hee Seok Choi, Heonchang Yu, Eun Young Lee, Brian Loza, Josué Pacheco-Chérrez, Diego Cárdenas, Luis I. Minchala, Oliver Probst

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


A comparative evaluation of the fatigue damage occurring in the blades of small wind turbines, with different power regulation schemes, has been conducted for the first time. Three representative test cases were built, one based on stall regulation and two using pitch regulation. The power curves were tuned to be identical in all cases, in order to allow for a direct comparison of fatigue damage. A methodology combining a dynamic simulation of a wind turbine forced by stochastic wind speed time series, with the application of the IEC 61400-2 standard, was designed and applied for two levels of turbulence intensity. The effect of the wind regime was studied by considering Weibull-distributed wind speeds with a variety of parameter sets. Not unexpectedly, in typical wind regimes, stall regulation led to a generally higher fatigue damage than pitch regulation, for similar structural blade design, but the practical implications were smaller than thought previously. Given the need for cost-effective designs for small wind turbines, stall regulation may be a viable alternative for off-grid applications.

Original languageEnglish
Article number4632
JournalApplied Sciences (Switzerland)
Issue number21
Publication statusPublished - 2019 Nov 1
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2019 by the authors. Licensee MDPI, Basel, Switzerland.


  • Aeroelastic simulation
  • Fatigue life
  • Pitch regulation
  • Small wind turbine
  • Stall regulation

ASJC Scopus subject areas

  • General Materials Science
  • Instrumentation
  • General Engineering
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes


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