Aeroservoelastic analysis of storm-ride-through control strategies for wind turbines

Carlo Tibaldi, Morten Hartvig Hansen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

An investigation of a control strategy to allow wind turbines to operate at high wind speeds by derating the rotor speed and generator torque set-points is presented. The investigation analyzes the wind turbine aeroservoelastic behavior in the above rated operational range by computing the aerodynamic gains and closed-loop eigenvalue solutions using a high-delity linear model. A simple strategy to reduce the reference rotor speed based on a pitch angle feedback is presented and analyzed. It is shown that high aerodynamic gains for operation at high wind speeds requires special handling in the scheduling of the controller gains. The computed closed-loop modal frequencies and damping ratios show how most turbine modes become less damped as the rotor speed is derated, and at very high winds the frequency and damping of the first drivetrain torsion mode are significantly reduced. Possible resonance problems can also be seen from the computed frequencies, and these problems may be worsened by the decreased damping during storm-ride-through. Finally it is shown that the dynamics of the pitch feedback to the derated generator speed is significantly affected by the operational wind speed, resulting in a slow response at high wind speeds.
Original languageEnglish
Title of host publicationProceedings of the 34th Wind Energy Symposium
PublisherAmerican Institute of Aeronautics and Astronautics
Publication date2016
Article numberAIAA 2016-1740
DOIs
Publication statusPublished - 2016
Event34th Wind Energy Symposium - San Diego, CA, United States
Duration: 4 Jan 20168 Jan 2016
Conference number: 34
http://arc.aiaa.org/doi/book/10.2514/MWES16

Conference

Conference34th Wind Energy Symposium
Number34
CountryUnited States
CitySan Diego, CA
Period04/01/201608/01/2016
Internet address

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