Digest of "Simulation Study of Different Modulation Techniques for Three-Level Quasi-Z-Source Inverter"

Abstract

In this paper are proposed and discussed three shoot-through sinusoidal PWM techniques for a three-level neutral-point-clamped quasi impedance source inverter that allow 50 Hz to be obtained as the output voltage frequency. The possibility of using shoot-through eliminates the need for dead-times without having the risk of damaging the inverter circuit. Mathematical descriptions with simulation results are presented for each modulation technique. Their advantages and disadvantages are shown and guidelines for further improvement are provided. Simulation using SymPowerSystems and Simulink of Matlab was used in our analysis. An analytical comparison between all three techniques was made based on output voltage quality, boost factor, input current ripple, and capacitor voltage balance. One of modulation techniques has shown the best performance and behavior because the shoot-through states are uniformly distributed and with constant width during the whole output voltage period and the average output voltage is compensated through the displacement of the carriers.