[Back]

V. Lesic, M. Vasak, N. Peric, G. Joksimovic, T. Wolbank:
"Fault-tolerant Control of a Wind Turbine with a Squirrel-cage Induction Generator and Rotor Bar Defects";
Talk: International Conference on Electrical Drives and Power Electronics EDPE, High Tatras, Slovakia; 2011-09-28 - 2011-09-30; in: "Proceedings of 17th Int. Conference on Electrical Drives and Power Electronics (EDPE)", (2011), ISBN: 0-12-402772-5; 364 - 369.

Wind turbines are usually installed on remote locations and in order to increase their economic competence malfunctions should be reduced and prevented. Faults of wind turbine generator electromechanical parts are common and very expensive. This paper proposes a fault-tolerant control strategy for variable-speed variable-pitch wind turbines in case of identified and characterized squirrel-cage generator rotor bar defect. An upgrade of the torque control loop with flux-angle-based torque modulation is proposed. In order to avoid or to postpone generator cage defects, usage of pitch controller in the low wind speed region is introduced. Presented fault-tolerant control strategy is developed taking into account its modular 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 a 700 kW wind turbine and the identified rotor bar fault are presented.

http://publik.tuwien.ac.at/files/PubDat_203329.pdf