APPLICATION OF PASSIVE HARMONIC FILTERS TO MITIGATE SOURCE SIDE CURRENT HARMONICS IN AN AC – DC - DC SYSTEM

H. Prasad, M. Chilambarasan, T.D.sudhakar

Abstract: A combination of rectifier and DC – DC chopper is useful in feeding DC loads where the DC input to the loads needs to be stepped up or down. Both rectifier and chopper are based on power electronic switches which inject harmonics in the system. This harmonics is an undesirable effect which should be mitigated effectively. For this, passive harmonic filters are used. Passive harmonic filters are a simple and economical option for harmonic mitigation. Thus they find widespread application in various power systems. This paper deals with the analysis of harmonic distortion caused in a typical AC system feeding a DC motor through a rectifier and boost chopper setup. The analysis is done before and after the incorporation of passive harmonic filters on the AC side in order to study the effect of the same in the mitigation of source side harmonics.

Keywords: Total Harmonic Distortion - THD, boost chopper, harmonics, tuned filters, resonance

DOI: https://doi.org/10.15623/ijret.2014.0301098