Fault tolerance method for open-winding motor bridge arm fault of double-three-level inverter topology

The invention relates to a fault tolerance method for an open-winding motor bridge arm fault of a double-three-level inverter topology, belonging to the technical field of inverter fault tolerance. According to the invention, six bidirectional thyristors are respectively arranged among three bridge arms of an inverter 1 and an inverter 2, wherein the bidirectional thyristor TR1 is separately connected with a bridge arm A1 and a bridge arm B2; the bidirectional thyristor TR2 is separately connected with a bridge arm B1 and a bridge arm C2; the bidirectional thyristor TR3 is separately connectedwith a bridge arm C1 and a bridge arm A2; the bidirectional thyristor TR4 is separately connected with the bridge arm A1 and the bridge arm C2; the bidirectional thyristor TR5 is separately connectedwith the bridge arm B1 and the bridge arm A2; the bidirectional thyristor TR6 is separately connected with the bridge arm C1 and the bridge arm B2; when the inverter 1 and the inverter 2 have no faults, all the bidirectional