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International Journal of Rotating Machinery
Volume 2018, Article ID 9538489, 8 pages
Research Article

Fault Tolerant Control of Internal Faults in Wind Turbine: Case Study of Gearbox Efficiency Decrease

National School of Applied Sciences, LGECOS Laboratory, Cadi Ayyad University, Marrakech, Morocco

Correspondence should be addressed to Younes Ait El Maati; moc.liamg@senuoy.itaamletia

Received 14 November 2017; Accepted 22 March 2018; Published 30 April 2018

Academic Editor: Ali Mostafaeipour

Copyright © 2018 Younes Ait El Maati et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper presents a method to control the rotor speed of wind turbines in presence of gearbox efficiency fault. This kind of faults happens due to lack of lubrication. It affects the dynamic of the principal shaft and thus the rotor speed. The principle of the fault tolerant control is to find a bloc that equalizes the dynamics of the healthy and faulty situations. The effectiveness decrease impacts on not only the dynamics but also the steady state value of the rotor speed. The last reason makes it mandatory to add an integral term on the steady state error to cancel the residual between the measured and operating point rotor speed. The convergence of the method is proven with respect to the rotor parameters and its effectiveness is evaluated through the rotor speed.