STUDY OF SHORT CIRCUIT FAULT DETECTION IN CASCADE H-BRIDGE MULTILEVEL INVERTER

This work propose Cascaded H-bridge (CHB) 7level inverter topology. Various switching frequency based PWM techniques such as Selective Harmonic Elimination PWM (SHEPWM), Optimized Harmonic Stepped Waveform PWM (OHSW PWM), Discrete Sine Area Equalization PWM (DSAE PWM), Sinusoidal PWM (SPWM) for constant and grid connected DC power source have been studied to mitigate the lower order harmonics Simulation has been carried out for 7-level inverter and results were presented with waveform and THD at different switches fault considering only switch short circuited type of fault conditions. Complete simulation work and results presented was carried out using MATLAB/SIMULINK software.