Computer simulation of power line harmonics or conducted emission generated by 6-pulse and 12-pulse rectifiers

The simulation of the rectifier circuits in a SPICE model is described, and the distorted line current waveforms and the spectrum of harmonic currents are shown. A reduction of harmonic content from the theoretical percentage was determined when the source impedance and the leakage inductance of a transformer are considered. The 12-pulse rectifier with 16.6% source reactance could reduce the 11th harmonic to 2.5%, which is less than MIL-STD-461 requirement.<
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