Common Mode EMI Mitigation at a Power Converter Network

A new approach to mitigate common-mode (CM) electromagnetic interference (EMI) has been presented in this paper. Conventional CM EMI reduction techniques are costly, especially in a system with largely networked power converters. The proposed topology will offer a new EMI cancellation solution without such costly trade-offs, that the conventional filter sciences face over efficiency, power density, and performance. The topology effectively functions as a virtual EMI filter within an energy system without using any additional active or passive circuits. Thus, it has the potential to achieve filter less energy systems. The proposed method has been validated through the LTspice simulator and modeled signal processing approach. The proposed algorithm has also been validated through medium voltage CM EMI testbed with multiple SiC half- bridge modules (300kVA, 1kV input DC voltage), following available EMI standards.