Abstract:
Now a days, electrical power system is very complex and it requires very careful design of new
equipment’s which are needed to improve electric power utilization, enhancing power system
stability, power loss minimization, power transfer capability and security. The existing power
transmission network of Ethiopia consists of 45KV, 66KV, 132KV, 230KV and rarely 400KV
lines. This research has been mainly focused on 132KV transmission line of south western region
of Ethiopia.
This paper presents the performance analysis, design and incorporation of control device (UPFC)
in the existing transmission network of south western region of Ethiopian Electrical Utility by
identifying the transmission line losses and voltage regulation problem. The modern power
electronics technologies have been used to maintain quality, controllability and power transfer
capability of electrical power system. Flexible AC Transmission Systems (FACTS) is one of the
modern power electronics technologies which are used in power systems. UPFC is the most
powerful and versatile power electronic equipment among the FACTS devices, which has emerged
for the control and optimization of power flow in the electrical power transmission system by
controlling the impedance, voltage magnitude and phase angle.
For the successfulness of this thesis work primary and secondary data have been collected from
the concerned entities. Transmission line data such as generation capacity, transmission line
voltage, impedance, transformer data and peak load data have been collected from Ethiopian
Electrical Utility. UPFC control strategies have been developed by using mathematical modeling
based on the collected data. The design of overall south western region transmission network have
been analyzed using MATLAB/Simulink software and comparative analysis of the transmission
line with UPFC and without UPFC have been done. This thesis have been showed that the
significant improvement of voltage profile, power transfer capability and total power loss
minimization have been achieved by incorporating UPFC.
