A Fault Tolerant-MLI with Modified PWM Technique for Symmetrical and Asymmetrical Voltage Levels

In the current scenario, fault-tolerant multilevel inverters (FTMLIs) have become necessary in driving emergency or critical loads with high-quality output voltage. This article introduces a new FTMLI, which can tolerate different types of single and multi-switch faults under symmetrical and asymmetrical voltage modes. The proposed converter has multiple redundant switching states to generate the required voltage levels and is an essential feature of high reliable converters. Further in this paper, a modified PWM control strategy utilizing available switching states to get the maximum possible voltage levels is presented. The effectiveness of the proposed scheme is verified with Simulink results.