I. INTRODUCTION
Huge bulky EMI filters are inevitable parts in power electronic systems, which provide attenuation to the EMI noise but take a significant portion of the total volume and weight of converters.
It is more obvious in DC-fed motor drive systems (shown as Fig. 1) with long connection cables where EMI filters are required for both AC output and DC input side.
Many works have been conducted on the EMI noise suppression in motor drive systems.
References [1-4] discussed some system EMI modeling methods for filter design.
Detail time-domain switching model is usually used to predict the EMI emissions. However, simulation of detail switching model usually have problems on convergence and simulation time due to the small simulation time step used to ensure the accuracy of the simulation result.
Frequency domain model is preferred to design and analyze EMI filters for motor drive systems.