Abstract
This article reviews and compares the effects of harmonic mitigation methods on line supply and drive. Several methods are used to reduce the line current harmonics caused by pulse width modulated (PWM) ac drives: ac line reactors, dc link chokes, phase-shifting transformers, passive harmonic filters (PHFs), multipulse converters, active filters, and active front ends. Each one does a good job of harmonic reduction and also affects the total current drawn from the supply transformer, the power factor, and the dc bus voltage within the drive. Several passive and active filters and an 18-pulse converter were tested. The comparisons are supported by computer simulations of drive systems and verified by extensive tests that were conducted in the lab.
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