期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2015
期号：MULTICON
页码：2073
出版社：S&S Publications
摘要：Three-phase four-wire distribution systems have been widely used in commercial and industrialinstallations. The neutral conductor carries the zero sequence current due to the unbalanced loading among the phaseconductors. However, as electronic loads increases, their rectifier front-ends reduce significant harmonic current. Thetriplet harmonic current produced by these loads tends to accumulate in the neutral conductor due to its zero sequencenature, thus resulting in overloading of the neutral conductor and the distribution transformer. Most of the existingharmonic mitigation schemes focus on re-directing zero sequence current harmonics back to the phase conductors.Such schemes can prevent overloading of the distribution transformer, but the neutral conductor is still burdened by theexcessive current harmonics.This paper proposes a new harmonic suppression scheme for the neutral conductors of three-phase four-wiredistribution systems. In the proposed scheme, an active Alter is connected in series with the neutral conductor. Theinverter acts to suppress harmonic current in the neutral conductor to prevent overloading. The active filter operationwill not affect the fundamental component due to the\ unbalanced loading, which the neutral conductor is sized for. Theproposed scheme can eliminate current harmonics overloading on both the neutral conductor and the distributiontransformer with only one active filter installation.
