Abstract:
High electrical power interruption is a major concern in Ethiopia. Most of the interruptions are
caused in the power distribution system. Particularly the radial distribution system of Adelle Haramaya and Harari, has higher power loss and poor voltage profile during heavy load
conditions. In this thesis, performance analysis is done on existing systems, proposed Ring
topology, and proposed Ring with Distributed Generation (DG) in the Adelle-Haramaya and
Harari distribution system respectively. A Metaheuristic Particle Swarm Optimization (PSO)
based is deployed for optimal Distributed Generation to significantly minimize the power loss
and enhance the voltage profile of the system. The proposed method is tested by using
MATLAB R2017a and ETAP16 software, and the objective function is evaluated by
considering constraints. The simulation results of the Adelle-Haramaya and Harari distribution
System show that 24.7Kw and 75.9Kw active power can be saved by applying the proposed
method and also the entire buses voltage profile are minimum voltage 0.95760pu and
maximum voltage 1.000pu and minimum voltage 0.78973pu and maximum 1.000pu are
maintained within the IEEE acceptable range except for Harari distribution system minimum
voltage (Ring with DG). In the end, reliability improvement of Adelle-Haramaya and Harari
distribution system (from Radial to Ring with DG) of SAIFI (f/customer.yr), SAIDI
(hr/customer.yr) and EEN (Mwhr/yr) are 16.3986, 399.4565 & 1151.021 to 11.3773, 287.6287
& 549.199 and 17.0493, 414.3857& 1031.956 to 11.05617, 270.1666 & 565.619 respectively.
The cost- effectiveness and payback period are also assessed and the results obtained
demonstrate that 77,114.9808 ETB and 476,302.22 ETB can be saved in each year after 32
years (Adelle-Haramaya) and 5 years (Harari) respectively. The proposed optimal results in
term‟s voltage profile improvement, power loss reduction, and system index improvement of
proposed Ring with DG system is better with respect to Radial and proposed Ring system.
Future researches shall be done on the protection and control of the upstream and downstream
sides of the system when DG is connected and installed.
