ANALYSIS OF MITIGATION TECHNIQUES FOR BEARING CURRENTS IN PWM INVERTER DRIVES

The purpose of this paper is to provide the reader with an introductory knowledge of the phenomenon of bearing currents, in which situations it occurs and how to mitigate the problem. This study presents different techniques and topologies of equipment for mitigation of bearing current in PWM inverter drives, available on the market. We present the techniques that can be applied to the existing drives, Many other methods which require special drive hardware or a motor solution are not discussed here. Since there are numerous industry papers available that discuss the details of problems caused by PWM VFD, this paper will focus on a more general discussion of the causes, analysis and possible solutions.