Open-Circuit Fault and Tolerant Method for 3-Level T-Type Inverter using Modified Space Vector PWM

In this paper a modified space vector pulse-width modulation (SVPWM) technique for a three-phase T-type inverter is proposed that utilizes the state redundancies for fault-tolerant application. The performance of the T-type, 3-level inverter is analyzed with a three-phase induction motor load under the open-circuit fault condition of the inverter. The voltage space vectors of the three-level inverter under the open switch fault (open circuit fault) condition in any one leg of the three-phase inverter is analyzed and modified using the SVPWM adopted to overcome the problems of sudden stall at open switch fault conditions. Modelling and simulation of T-type 3-level inverter using proposed modified space vector pulse width modulation is carried out in the MATLAB/SIMULINK environment. The experimental results are presented here for verification of the simulation results using real-time simulator (dSPACE 1103).