Abstract
Spectral content of conducted emission generated in ASD, at output side of voltage source inverter (VSI) depends primarily on transistor's switching characteristics. However, impedance‐frequency characteristics of possible propagation paths connected directly to output terminals of frequency converter can also essentially influence the final conducted emission distribution and local propagation paths. Therefore frequency dependent impedance characteristics of converters’ load can substantially influence levels of internally generated conducted emission in ASD and consequently also external conducted emission towards the power grid. Analysis of typical PWM switching patterns of inverter's bridge allows to determine the most possible propagation paths of differential and common modes of conducted emission during transistors’ commutation processes. Detailed analysis of wideband behavior of the whole ASD system is enormously complex and difficult to model entirely, therefore number of simplifications are usually applied to model ASD for efficient analysis of conducted emission propagation. A simplified analysis presented in this chapter explain the process of conducted emission generation at motor side of FC with VSI with carrier‐based PWM modulation pattern.
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