Load reduction on a clipper liberty wind turbine with linear parameter-varying individual blade pitch control

Daniel Ossmann, Julian Theis, Peter Seiler

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


The increasing size of modern wind turbines also increases the structural loads caused by effects such as turbulence or asymmetries in the inflowing wind field. Consequently, the use of advanced control algorithms for active load reduction has become a relevant part of current wind turbine control systems. In this paper, an individual blade pitch control law is designed using multivariable linear parameter-varying control techniques. It reduces the structural loads both on the rotating and non-rotating parts of the turbine. Classical individual blade pitch control strategies rely on single-control loops with low bandwidth. The proposed approach makes it possible to use a higher bandwidth since it accounts for coupling at higher frequencies. A controller is designed for the utility-scale 2.5 MW Liberty research turbine operated by the University of Minnesota. Stability and performance are verified using the high-fidelity nonlinear simulation and baseline controllers that were directly obtained from the manufacturer.

Original languageEnglish (US)
Pages (from-to)1771-1786
Number of pages16
JournalWind Energy
Issue number10
StatePublished - Oct 2017

Bibliographical note

Funding Information:
This work was performed in the framework of the Xcel Energy Renewable Energy Fund: Contract Number RD4-13. The project title is Virtual Wind Simulator with Advanced Control & Aeroelastic Model for Improving the Operation of Wind Farms. This work was also supported by the National Science Foundation grant no. NSF-CMMI-1254129 entitled CAREER: Probabilistic Tools for High Reliability Monitoring and Control of Wind Farms.

Publisher Copyright:
Copyright © 2017 John Wiley & Sons, Ltd.


  • load reduction
  • robust control
  • wind turbine control


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