RELIABILITY IMPROVEMENT FOR DISTRIBUTION SYSTEM WITH DISTRIBUTED GENERATION:

Abstract

The main mission of the utility companies, Ethiopian electric power (EEP) and Ethiopian electric utility (EEU) are to transmit, distribute and supply electricity in reliable and efficient manner. This project deals with power systems reliability including technical, economical, and decisional aspects. Knowing that almost 90% of failures occur in the distribution systems, great interest was dedicated to this part of the system, and the first work was oriented to reliability indices defined as objectives to attempt and as performance measures in the electricity market. There are many causes of power failures in an electricity network. Some of these causes include faults at powerstations, damage to electric transmission lines, substations or other parts of the distribution system, a short circuit, cascading failure, fuse or circuit breaker operation. All of the abovementioned causes affect the reliability of power system. Reliability is a key aspect of power system design and planning. In this project, we present a reliability improvement technique for power distribution system, normally operated (with respect to substation), electrical distribution systems. With recent advanced technology, utility expect to see increasing amount of distributed generation (DG) on the distribution system. Reliability improvement is very important in power system. Having a DG ensures reliability improvement and may be used to increase the reliability worth. This project presents the study of radial distribution system and the impact of placing DG in order to increase reliability. The reliability of power distribution system can be analyzed using reliability indices. The aim of the project is to perform and assessment of how and where a DG have to be placed. In addition, the impact of adding one DG to each feeder of the system, as well as the impact of placing DG at various distance plus the amount of DG installed is presented. It also pretends to recall the importance of understanding of power system reliability from an investment view for the supplier in order to enhance the DG installation to costumer. The study is performed using DIG silent software and ETAP software’s.