Analysis of Hybrid Modulation Techniques for Single Phase Reduced Switch Symmetric Multilevel Inverter Fed Induction Motor

This study offers a modified single-phase cascaded H-Bridge based 9-level inverter that provides DC voltage levels similar to those of previous topologies but with fewer semiconductor switches. It operates in symmetric mode. This article also discusses how to use modified carrier pulse width modulation methods to create a reduced switch symmetric multilevel inverter. This suggests a modified method of carrier pulse width modulation that includes a triangle saturated carrier waveform and a third harmonic injection reference signal. The goal is to reduce THD and raise the output voltage’s basic value. Through the use of simulations in MATLAB Simulink, the success of the suggested method is assessed by comparing the THD. The simulation results show that the effectiveness of the minimized switch symmetrical multilevel inverter, utilizing the triangle saturated carrier pulse width modulation technique, is significantly better than other pulse width modulation methods and offers high RMS voltage, which could be utilized in PV inverter fed grid applications.