Fault Diagnosis and Tolerance Strategies in Multi-Level Inverters

Abstract

Multi-level inverters (MLIs) have become essential in modern power electronics systems, particularly in high-power and renewable energy applications, due to their ability to improve output waveform quality and reduce Total Harmonic Distortion (THD). However, as the complexity of MLIs increases, so does their susceptibility to faults, which can compromise performance and lead to system downtime. This paper provides a comprehensive analysis of fault diagnosis and fault tolerance strategies in multi-level inverters, focusing on fault detection methods, control strategies, and hardware redundancy approaches. Simulation results demonstrate the effectiveness of these strategies in maintaining system reliability, even under fault conditions. The findings highlight the importance of fault-tolerant designs in ensuring continuous operation in critical applications such as renewable energy systems, industrial drives, and electric vehicles.