Control method of NPC inverter for continuous operation under one phase fault condition

The reliability of power electronics system is very important in industrial, commercial and military applications. Some applications have a need of high reliability. It's necessary to develop an optimal remedial strategy which can be used to continue the application when fault occurs. The fault tolerance is obtained by the use of the particular construction The control method is proposed to get the sinusoidal phase current with constant amplitude under the single power device fault condition. The strategy described in this paper is expected to provide an economic alternative to more expensive redundancy techniques.