Mitigation techniques of conducted emi in multilevel inverter drives

In this paper the method of passive compensa- tion of a common mode (CM) voltage in a multilevel inverter drive system by means of the filter having sinusoidal output voltages and zero CM voltage has been presented. The main problem with the application of this solution is a magnetic saturation of the CM choke. There have been presented simu- lation and experimental results showing that the problem with magnetic saturation become less important in multilevel in- verter drives, thus permitting a reduction of size, weight and cost of inductive components of filters in such drives.