| Summary: | Recently, harmonic study in power system received added significance. This is
because devices which generate harmonics current are increasing in power system.
Harmonics sources are such as power electronic devices and electric arcing devices. The
harmonics generated will affect power quality and power system stability. In this project,
study of harmonics were carried out at Welding Workshop in School of Mechanical
Engineering, University Science Malaysia. There are electric arc welding machines
which are the main harmonic sources in the studied location. This study was carried out
to improve the power quality of power system and ensure the stability of the system in
the plant. The study include harmonic field measurement, harmonic analysis, and filter
design work to reduce harmonic distortion. The filter designed is not only used to
reduce harmonics current, but also used to improve power factor of the system. In this
report, theories of harmonics and power factor was discussed and analytical technique
used to correct power factor was presented. It is expected that the improvement of
harmonic distortion after installation of proposed filter is from 19.38% to 12.41%,
whereas the displacement power factor will achieve 0.90. The technique used in this
project can be a reference for improving power quality in other similar plant.
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