Investigation of the effect of the gap at the zero-crossing point of PWMs creating the first level voltage in a multi-level inverter

Abstract

Using multi-level inverters in converting direct current to alternating current is one of the most demanded and used methods. It is one of the techniques that can be used to create the first level voltage ground by setting the PWM operating times at the zero point grossing from the positive and negative cycles to the gate while creating a multi-level voltage with inverters. In this case, it affects the quality of the generated voltage. Therefore, this article examines the effect of variation in operating times and frequencies of first-line PWMs on this zero-crossing point. First, the inverter structure is given. Then, transition PWM run times are tried for different first-level voltages on the loads. The results obtained show that the PWM operating times at the transition point are quite effective on the load currents and voltages.