Abstract:

In the six-switch three-three induction generation system, a few usual fault modes can be tolerated by increasing some low cost hardware. The system is reconfigurated as a four-switch three-phase generation system after the short-circuit or open-circuit fault of a power switch has been detected and isolated. Features of voltage space vectors of the tolerant four-switch system are analyzed. The adjust effect of different voltage vectors to flux linkage and torque is investigated. Control scheme of flux linkage and torque in instantaneous torque control(ITC) of four-switch three-three system is proposed. Several key problems of four-switch three-phase system are researched . An effective method to restrain voltage excursion of two capacitors by modifying the torque command is presented. Simulation and experimental results are presented finally.

Key words: power electronics technology, aero power, fault tolerance, induction generator, instantaneous torque control(ITC)