Comparative Analysis of Modulation Techniques for Elimination of CMV in Multilevel Inverters

In three phase Induction Motor drives the high frequency Common Mode Voltage affects the operating condition and overall performance, due to the circulating current. The resolving of this issue is a challenging task, otherwise results in decreasing overall efficiency of the system. A variety of mechanical and electrical procedures have been proposed by authors to prevent CMV, each of which has its own advantages and disadvantages. Lower-order harmonic contents in the output waveforms can be reduced by the inverters' ability to control the output voltages using PWM approaches. This paper evaluates the PWM techniques to analyze common mode voltage elimination in multilevel inverters and compares the Common Mode Output Voltages and Total Harmonic Distortions.