Evaluation of New COPWM Techniques for Three Phase Seven Level Diode Clamped Z-Source Inverter

This paper presents the comparison of the different Carrier Overlapping Pulse Width Modulation (COPWM) techniques for three phase seven level Z-source diode clamped inverter. Due to switch combination redundancies, there are certain degrees of freedom to generate the multi level AC output voltage. This work presents the use of CFD combination. The Z-source based DCMLI is triggered by the different COPWM techniques having sinusoidal reference and triangular carriers. It is observed that the COPWM-3 technique provides reduced harmonics at its output voltage. The effectiveness of the PWM techniques developed using CFD are demonstrated by simulation using MATLAB/SIMULINK.

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