Abstract:
Reliable and stable electric power supply system is very important for the technological
and economic growth of any society in every country. Now a days, life is directly or
indirectly depends on electric power. Accordingly utility should deliver reliable power
supply throughout the year. But in developing countries like Ethiopia, frequent power
interruptions and instabilities occur which hamper the reliability of power supply. One
possible solution which can help to restore power supply in the event of distribution
system failure is network renovation. In this thesis, the network renovation on distri bution system to improve reliability has been performed.
The Matlab code used for tie line and sectionalizing switch sets in order to open and
close the switches using the algorithm of fast non-dominated sorting genetic algo rithm(FNSGA) are used as it is written in the appendix B and C. where as Newton
Raphson power flow method used to analyze the network inside Electrical Transient
Analyzer Program (ETAP 19.0.1) software. The networks are radial connection in
consisting of five feeder lines with two of them having 132/33kv and the remaining
three of them having 132/15kv. The analysis presented both base-case and post-case
for comparison on feeder line two. Based on this the pre-renovation system indices are
evaluated: SAIDI (312.67) hr / customer.yr; SAIFI (497.94) f / customer.yr , CAIDI,
EENS, ASAI and ASUI are recorded ( 0.628, 128.31, 0.9695p.u and 0.03569p.u ) respec tively. After renovation or post-renovation system indices evaluated: SAIDI (267.38)
hr / customer.yr; SAIFI (431.12) f / customer.yr; CAIDI, EENS, ASAI and ASUI
are recorded (0.620, 109.793, 0.9695 and 0.03052) respectively. This result shows
as:-SAIDI, SAIFI, CAIDI, EENS, ASAI and ASUI have been improved by 14.48%,
13.41%, 1.27%, 14.43%, 0.53% and 14.48% respectively. Accordingly it can provide
un-substitutable solution with regarding to enhancing reliability of the supply to meet
consumer demands.
