Studies on Power Distribution System Reliability Assessment and Improvement (Case Study: Jimma Town Distribution System)
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Date
2017-03
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Addis Ababa University
Abstract
A reliable electric power supply system is a predictable pre-requisite for the technological,
political and economic growth of any nation. This is a reaction of an increasingly electricity
dependent society, which demands electricity supplies at acceptable quality levels and at
reasonable tariffs. Power interruption becomes a serious problem in Ethiopia. This is because of
the very high outage frequency and very long time service restoration. Due to this problem, day to
day activities of the society are highly affected and hence they are strongly complaining the electric
utility. Power interruption significantly costs both sides, the utility and the customer.
This research has been conducted a studies on powers system reliability assessment and
improvement with a case study in Jimma town distribution system. Customers has complained
soundly about power interruptions in the city. The reliability assessment has been done on 15kV
city feeder to assess the performance of the present system and also predictive reliability analysis
for the future. The interruption data of years 2010-2015 has been used as a base year. The study
has evaluated different mitigation alternatives to improve the system reliability at reasonable cost.
Many alternatives has been assessed using heuristic method and the alternative with low SAIDI,
SAIFI and EENS at a reasonable cost has been selected.
In general, this thesis work reveals that the reliability of the system has been improved significantly
by implementing reliability improvement solutions that are justified economically. Even if the
uncertainty of the input data is taken into account, SAIFI has been reduced by 84.75 % as
compared with the average reliability indices values of the system in the base years. In the same
case SAIDI and EENS have been decreased by 85 % and 88.651 % respectively.
The proposed solution has been saved 579523.96 ETB per year from the unsold energy of one
feeder only with 2.03 years payback period investment. Satisfaction of the society has been
considered as a priceless advantage.
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Distribution System