A Fault-Tolerant Multilevel Inverter Topology Configured with Three Sources with Improved Performance in Post-Fault Conditions

This paper presents a novel topology for fault-tolerant multilevel inverters featuring three sources with improved performance in post-fault conditions. The conventional three-source topology has a total of eight switches, and anyone switch's failure severely impacts output voltage and harmonics. A fault analysis has been carried out for the conventional three-source topology, which has led to the development of a novel fault-tolerant MLI. For the proposed fault-tolerant topology, the number of levels and output voltage improve in the post-fault conditions for different modes of operation. For the proposed topology, a detailed fault analysis, along with the power quality assessment that has been carried out for open-circuit faults to every switch, has been provided in this paper. Finally, the simulation results have been provided to validate the proposed topology.