Analysis and simulation of conducted EMI generated by switched power converters: application to a voltage source inverter

This paper presents a frequency-domain analysis method for the calculation of conducted EMI disturbances produced by power electronic converters. Switched power converters have a singular behaviour from the EMC point of view. The complex geometry and the wide range of time constants involved, make the calculation of conducted disturbances a complex matter. The new modelling method presented here is based on a "source-propagation path-derived disturbance" simulation process and is specially designed to overcome the above mentioned problems. In the design of the proposed method quick and robust simulations were preferred rather than very accurate results. The features of the proposed method are shown in the paper by comparing simulation results with experimental results obtained in a general purpose three-phase voltage source inverter.