A Multilevel Active CM Noise Power Filter for Multilevel Inverters

Common-mode voltage (CMV) caused by switching operations of power converters can significantly degrade the system's stability and performance. Since the effects of the CMV are more prominent in the wide-bandgap-based applications that require fast-switching slew rates, many research articles have been proposed to mitigate CM noise generated by the CMV. In addition, as topologies and control methods of the power converters become more complicated for better performance, more advanced CM noise attenuation methods are required accordingly. Therefore, this article proposes a CM noise attenuation method using a multilevel active CM noise power filter in a five-level inverter system. In this article, detailed control methods and considerations of the proposed multilevel system are presented, and the validity of the proposed multilevel active CM noise power filter has been verified through experimental results.