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Energies 2012, 5(4), 938-967; doi:10.3390/en5040938

H Based Control for Load Mitigation in Wind Turbines

* ,
IKERLAN-IK4, Arizmendiarreta, 2, E-20500 Arrasate-Mondragon, The Basque Country, Spain
* Author to whom correspondence should be addressed.
Received: 25 January 2012 / Revised: 20 March 2012 / Accepted: 31 March 2012 / Published: 17 April 2012
(This article belongs to the Special Issue Wind Turbines)


This article demonstrates a strategy to design multivariable and multi-objective controllers based on the H norm reduction applied to a wind turbine. The wind turbine model has been developed in the GH Bladed software and it is based on a 5 MW wind turbine defined in the Upwind European project. The designed control strategy works in the above rated power production zone and performs generator speed control and load reduction on the drive train and tower. In order to do this, two robust H MISO (Multi-Input Single-Output) controllers have been developed. These controllers generate collective pitch angle and generator torque set-point values to achieve the imposed control objectives. Linear models obtained in GH Bladed 4.0 are used, but the control design methodology can be used with linear models obtained from any other modelling package. Controllers are designed by setting out a mixed sensitivity problem, where some notch filters are also included in the controller dynamics. The obtained H controllers have been validated in GH Bladed and an exhaustive analysis has been carried out to calculate fatigue load reduction on wind turbine components, as well as to analyze load mitigation in some extreme cases. The analysis compares the proposed control strategy based on H controllers to a baseline control strategy designed using the classical control methods implemented on the present wind turbines.
Keywords: wind turbine; robust control; multivariable; H control; load mitigation wind turbine; robust control; multivariable; H control; load mitigation
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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de Corcuera, A.D.; Pujana-Arrese, A.; Ezquerra, J.M.; Segurola, E.; Landaluze, J. H Based Control for Load Mitigation in Wind Turbines. Energies 2012, 5, 938-967.

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