Fault-Tolerant Design of Paralleled Three-phase Topology with Active Bidirectional Switches

The paralleled three-phase topologies have been used to extend the power rating and enhance the reliability of motor drive system. When the fault occurs, the faulty bridge would be cut off and the healthy bridges can still supply the motor to keep smooth torque output. However, the existing methods can only tolerate the open-phase faults. This paper proposes a paralleled topology equipped with active bidirectional switches for fault isolation and topology reconfiguration, which could be used for more severe short-circuit faults, including single-phase and multiphase faults.