Modeling and Validation of Common-mode Emissions of Silicon Carbide Enabled Motor Drive in Extended EMC Frequency Range Between 2 kHz and 30 MHz

Common-mode current circulation inside smart grids is among the most important issues, especially with the increased usage of high-speed switching power converters. To ensure compatibility within both new and conventional power grids, standard organizations are extending the existing conducted emission electromagnetic compatibility frequency range to include portions of the previously unregulated 2 kHz to 150 kHz range. This article addresses the common-mode emissions modeling of SiC-enabled high-power motor drives between 2 kHz and 30 MHz. The authors use the "Gray"-box dominating-parasitic-oriented modeling method to provide an accurate and efficient common-mode analysis and mitigation design tool. The modeling case study demonstrated in this article is a 113 kW, 480 V, unfiltered SiC-enabled front-end variable frequency drive operating under different switching frequencies (20 kHz and 100 kHz).