Phase Multilevel Inverter Fault Diagnosis and Tolerant Control Technique

Abstract

This paper gives a solution to implement a self-diagnosis and tolerant control for a 3-level neutral point clamped inverter. Redundancies in semiconductor configurations are used to enable a continuous operation with a faulty power switch. The fault tolerance is obtained by using a SCR to substitute faulty switch. In case of failure events, the on-line diagnosis technique can fix faulty switch and take relevant tolerance measures. Through simulations and experiments, this diagnosis technique is validated.