SPACE VECTOR MODULATION TECHNIQUE FOR COMMON-MODE VOLTAGE REDUCTION IN A 3 PHASE 5 LEVEL INVERTER

Abstract

This paper presents a switching pulse modulation method to ensure that the common mode voltage on a 3-phase 5-level cascade inverter is within ±1/3 times of the power supply voltage to the module. The method developed is based on the technique of selecting combinations of switching vectors that produce a voltage value between the center of the load phase and the center of the source phase within the allowable limits. Line voltage variation is considered during the selection of the switching pulse sequence, ensuring the lowest value of line voltage variation over time. The results are verified and evaluated on the simulation model using Matlab/Simulink and Plecs software.