Evaluation The Impact Of Distribution Network Renovation For Reliabil Ity Enhancement(Case Study: Dilla Town Distribution

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.