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V. Lesic, M. Vasak, N. Peric, G. Joksimovic, T. Wolbank:
"Fault-Tolerant Control of a Blade-pitch Wind Turbine With Inverter-fed Generator";
Talk: IEEE International Symposium on Industrial Electronics (ISIE2011), Gdańsk, Poland; 2011-06-20 - 2011-06-27; in: "Proceedings ISIE 2011", (2011), ISBN: 9781424493111; 2097 - 2102.

A fact is that wind energy is both green and
expensive energy. In order to increase its economic competence,
wind turbine faults should be reduced and prevented. In wind
turbines faults most commonly occur in the gearbox and in the
generator system components like power converter or generator
electromechanical parts. This paper proposes a fault-tolerant
control strategy for variable-speed variable-pitch wind turbines
in case of identified and characterized generator electromechanical
faults like broken rotor bar or winding inter-turn fault. In
particular we propose an upgrade of the torque control loop with
flux-angle-based torque modulation. Usage of pitch controller
in the low wind speed region is also proposed to intentionally
reduce power capture in order to avoid or to postpone the system
fault development. Presented fault-tolerant control techniques are
developed considering their easy implementation and installation
in available control systems of existing wind turbines to extend
their life cycle and energy production. Simulation results for the
case of 700 kW direct-drive wind turbine and the identified stator
winding fault are presented.

http://publik.tuwien.ac.at/files/PubDat_202678.pdf