Design of Linear Control System for Wind Turbine Blade Fatigue Testing

Anders Toft, Bjarke Nørskov Roe-Poulsen, Rasmus Christiansen, Torben Knudsen

Research output: Contribution to journalConference article in JournalResearchpeer-review

2 Citations (Scopus)
214 Downloads (Pure)


This paper proposes a linear method for wind turbine blade fatigue testing at Siemens Wind Power. The setup consists of a blade, an actuator (motor and load mass) that acts on the blade with a sinusoidal moment, and a distribution of strain gauges to measure the blade flexure. Based on the frequency of the sinusoidal input, the blade will start oscillating with a given gain, hence the objective of the fatigue test is to make the blade oscillate with a controlled amplitude.

The system currently in use is based on frequency control, which involves some non-linearities that make the system difficult to control. To make a linear controller, a different approach has been chosen, namely making a controller which is not regulating on the input frequency, but on the input amplitude. A non-linear mechanical model for the blade and the motor has been constructed. This model has been simplified based on the desired output, namely the amplitude of the blade. Furthermore, the model has been linearised to make it suitable for linear analysis and control design methods.\\ The controller is designed based on a simplified and linearised model, and its gain parameter determined using pole placement. The model variants have been simulated in the MATLAB toolbox Simulink, which shows that the controller design based on the simple model performs adequately with the non-linear model. Moreover, the developed controller solves the robustness issue found in the existent solution and also reduces the needed energy for actuation as it always operates at the blade eigenfrequency.
Original languageEnglish
Book seriesJournal of Physics: Conference Series (Online)
Number of pages10
Publication statusPublished - 2016
EventThe Science of Making Torque from Wind (TORQUE 2016) - Technische Universität München, Munich, Germany
Duration: 5 Oct 20167 Oct 2016


ConferenceThe Science of Making Torque from Wind (TORQUE 2016)
LocationTechnische Universität München


  • Wind
  • Wind turbine blade
  • fatigue testing

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