An Experimental Analysis of Harmonic Distortion Indices In Home Based Electrical Appliances and Improvement Using Passive Filter
Nowadays, the growing use of non-linear loads in home appliances gives rise to harmonic pollution in the electricalpower distribution system, which degrades the power quality. Many domestic appliances have power electronicconverters that characteristically draw a non-sinusoidal current waveform. Short-term effects of non-linear appliancesare causing malfunction and damage of electronic devices and long-term effects are thermal losses in equipmentand cable, hasty aging, and reduced life period of devices. The whole impact depends on the power ratings andquantity of electrical appliances and their harmonic diversity. Usually, the existence of harmonics and their effectsin a domestic zone are not monitored as compared to the industrial and commercial sectors. To ensure the qualityof power, it is necessary that a harmonic study is carried out to identify the details of harmonic pollution that ispolluting sources, the parameters or quantities they pollute in each instance, and effective improvement methods.In this paper, experimental analysis was performed which focuses on traditional single-phase home-based electricalappliances causing the quality of power down, and implementation of the passive filter is suggested for improvementin the quality of power. All experimental harmonic distortion measurements of home-based electrical appliances wereperformed in the power electronic laboratory of QUEST Nawabshah. Harmonic distortion indices measurements ofhome-based electrical appliances have been taken using the fluke power quality Analyzer (PQA) instrument. Theanalysis shows that from many types of loads, switch mode power supply (SMPS) based load is rich in harmonicdistortion. Therefore, an equivalent model of SMPS load in MATLAB/Simulink is developed to analyze improvementin power quality by designing and implementation of the passive filter. The outcome of this research work will behelpful to make the source current sinusoidal by reducing harmonic distortion and thus improve the power quality.
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