Reconfiguration of Four-Level Active Neutral-Point-Clamped Inverters for Fault-Tolerant Operation

This paper proposes a reconfiguration of four-level active neutral-point-clamped (4L-ANPC) inverter structure for preserving a fault-tolerant operation during open fault conditions. A set of fault-tolerant switches (FTS) is included at each phase in order to replace the functions of faulty switches. With this integration, the maximum possible number of level at output line voltage is preserved based on the failure case. The effectiveness of the proposed technique has been verified by simulation results.