EMC analysis of 18-pulse AC-DC circuit consisting of three level AFE rectifiers based on PWMSHE method with three switching angles for quarter-period

In the article is devoted to electromagnetic compatibility (EMC) analysis of 18-pulse AC-DC circuit consisting of three level active front end (AFE) rectifiers based on a pulse width modulation selective harmonic elimination (PWMSHE) method with three switching angles for quarter-period. 18-pulse AC-DC circuit is made as a parallel connection of three power transformers which have the secondary winding voltages phase shift 20°, 0°, and -20°. The each three level AFE rectifier consists of power transistors and connects to the transformer secondary winding. The EMC analysis of this circuit has been carried out by simulation using Matlab/Simulink program. Researches of the PWMSHE method has been presented to estimate total harmonic distortional (THD) and harmonic spectrum of current and voltage. To minimize the THD or decrease the harmonic spectrum, the research results can be used to estimate the EMC of industrial medium voltage AC drives based on three level AFE active rectifiers or inverters.

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