Mitigation of Harmonics in a Three-Phase, Four-Wire Distribution System using a System of Shunt Passive Filters

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Author(s) Erwin Normanyo
Pages 761-774
Volume 2
Issue 5
Date May, 2012
Keywords Power distribution system, harmonics, shunt passive filter, total harmonic distortion (THD).

Abstract

Three-phase four-wire distribution systems are very common and widely used in commercial and industrial installations and therefore power systems harmonics is an area that merits a great deal of attention. Advancement in semiconductor devices has fuelled an increase in the use of non-linear loads which are the main causes of harmonic distortion in three-phase, four-wire distribution systems. Mitigation of harmonics in three-phase, four-wire electrical power distribution systems that supply balanced and unbalanced non-linear loads was therefore conducted. Giving consideration to the 5th and 7th order harmonics, the mitigation system was modeled and simulated using Matlab/Simulink. Three experiments were conducted for each order of harmonics. Simulation results showed that a better filtering ability is obtained when the characteristic impedance of the shunt passive filter is small and also for a larger resonance frequency also gave better filtering ability. Implementation of the developed model in a three-phase, four-wire power distribution systems promises an absolute minimum of the harmonics content and thus improved harmonics-focused power quality. This paper proposes an approach to compensate for harmonics in a three-phase four-wire power distribution system. The mitigation principle is described, and some interesting filtering characteristics are discussed.

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