Power Quality Assessment at Selected Industrial Plants in Addis Ababa City
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Date
2011-05
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Addis Ababa University
Abstract
This thesis presents a general-purpose power quality assessment at selected industries in
the city of Addis Ababa. From the point of view of its academia purpose, the assessment
investigates all the major transient and steady state electrical phenomena that disturb the
power quality of a conventional power system. As such, the seven major categories of
power quality phenomena listed by the IEEE Standard 1159-1995 are assessed in this
thesis work.
The necessary data are collected from recorded data of the Ethiopian Electric Power
Corporation and plants of study, from phenomena record of utility eqiupments, and
through direct measurement using harmonic analyzer. The time schedule of data
collection and measurements, as to meet the IEEE requirements, varies from a single
power-period to 11- years depending on the power quality event to be studied. From the
ground of the objective of the assessment, the monitoring locations on the other hand are
chosen to be the service entrances of the corresponding industries.
The collected data are analyzed and the results are then compared with the IEEE
requirements. In that case, voltage variations reaching 21% and frequency deviations of
1% to 4% are discovered. Current distortions of THD value that reach 33.5% are also
discovered at Wubcon plc. Harmonic filters, that have an added feature of power factor
correction, are therefore designed for Wubcon plc.
Software simulations are run using SimPowerSystems, Simulink to show the level of
mitigation of the proposed solutions for capacitor-switching transients. The designed
filters for Wubcon plc are also run on SimPowerSystems.
Key words: Power quality, Power quality phenomena, IEEE standards, Reliability
indices, Benchmarking metrics
Description
Keywords
Power quality, Power quality phenomen, AIeee standards, Reliability indices, Benchmarking metrics