Series Passive Compensation of Common Mode Voltage in Multilevel Inverter Drives

This paper presents an approach to the problem of a magnetic saturation of CM chokes that accompanies the method of passive compensation of a common mode (CM) voltage in an inverter drive system. Measurements have been provided in a drive system including multilevel inverters and the filter having sinusoidal output voltages and zero CM voltage. The theoretical analysis and experimental results show that the problem with magnetic saturation becomes less important in multilevel inverter drives, thus permitting a reduction of size, weight and cost of inductive components of filters in such drives