Robustness of Frequency-Domain Terminal Modeling of Electromagnetic Interferences in Static Converters

Power electronics converters generate conducted electromagnetic interference (EMI) over a wide frequency range. In order to prevent pollution of the electrical network and thus comply with electromagnetic compatibility (EMC) standards, it is necessary to install filters at the input side of converters. The optimal design of these filters requires modeling the entire energy conversion system and using the proposed models in circuit simulations (SPICE, etc.). Depending on whether the conversion system is already implemented or in the design stage, there are several modeling methods. When the system is already implemented, the method that treats the converter with its load as a black-box model, called “Terminal Modeling” is particularly suitable in this case. In this paper, we highlight its limitations and propose a gray-box model to enhance its accuracy and robustness up to 100 MHz.