Fault-Tolerant Three-Phase Quasi-Switched Boost Switched Inverter

This paper proposes a fault-tolerant topology based on the three-phase quasi-switched Boost Inverter (qSBI). Besides the additional qSBI, the solution also uses non-active power devices to reconfigure the topology and maintain the normal operation in case of an open-circuit failure mode of a power device. The proposed topology presents important features such as boost capability, avoids extra inductors, capacitors or active power devices. Regarding the control solution for this topology, it will be used on a closed-loop current controller at which be associated a vectorial voltage modulator. Since this modulator is also function of the shoot-through will be possible to recover the amplitude voltage space vectors due to failures in power devices. The combination of these elements allows to obtain three-phase balanced AC currents with reduced total harmonic distortion even in fault-tolerant operation mode. The fault tolerance performance of this solution will be confirmed through several simulation results.