A New Fault Tolerant Five-Level Multilevel Inverter for Critical Loads

This work offers a fault tolerant (FT) multilevel inverter that may operate continuously even when an open switch fault (OSF) occurs in a single or several power switches. The number of power semiconductor devices used in dc-ac converters has increased in order to obtain high-quality voltage waveforms, making them prone to failure. As a result, one of the most significant issues in the use of multilayer inverters (MLIs) in many industrial applications is reliability. Simultaneously, reduced component multilevel inverters (RC-MLIs) can obtain the highest resolution in output voltage waveform by sacrificing critical aspects (such as fault tolerance ability, charge balancing control, and so on), but it must be kept. In terms of switch level failures, redundant switching states have been prioritized for effective fault tolerant operation of MLIs. In the event of an open circuit fault on single or many switches, a study is being conducted to design an unique fault-tolerant MLI. As a result, the suggested FT-MLI structure can meet the operating requirements for the time being and is said to have fewer components. To generate the desired output voltage waveforms, a valid fault tolerant switching approach is used in conjunction with sufficient fault clearance.