A significant challenge in WBG-based drive design is mitigating EMI to suffice EMC standards and to prevent over-design. Therefore, common-mode (CM) behavior models that are highly accurate in higher frequencies and computationally efficient are needed. This study demonstrates a “gray”-box analytical method for the CM behavior modeling of an unfiltered 113 kW DC-fed three-phase VFD and the hardware validation. The model developed in this study can mathematically model the CM/DM cross-mode coupling effects due to electric circuit and magnetic structure asymmetry with accuracy up to 30 MHz.
