Studies on Voltage Profile Improvement and Power Flow Control in Ethiopian Transmission Networks using FACTS Devices
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Date
2022-07
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Addis Ababa University
Abstract
At present Ethiopian transmission network is operating at its full capacity due to increased demand
resulting in unbalances in power flows and voltage profile violations. Control of power and voltage
through appropriate allocation of active and reactive power suppliers increases system efficiency
without the need to expand and build new power generation and transmission facilities. Flexible
AC Transmission System (FACTS) controllers employ the latest technology in the design of power
electronic switching devices for electric power transmission systems to control voltage and power
flow and improve voltage regulation. This study investigated the control ability of employed
Thyristor Controlled Series Capacitors (TCSCs) in the alleviation of line congestion, loss
minimization, and Static Var compensators (SVCs) in enhancing system voltage profiles in
Ethiopian high voltage transmission networks. Modeling and simulation of the transmission
network with the incorporation of the FACTS devices have been performed using PSAT/MATLAB
toolbox. The sensitivity analysis technique was performed on base case power flow results for
optimal placement of the controllers. It is shown how the system behaves and performance is
improved with comparative case studies without and with the devices. The final power flow
solution result with four FACTS (two TCSC and two SVC) show the improvements and reduction
of system maximum line loading, total real power loss, and voltage regulations from 91.16%, 4.46%
(115.1 MW), and 15.6% base case to 81.47%, 3.68% (94 MW), and 7.3% respectively by the
FACTS.
Description
Keywords
TCSC; SVC; Optimal Placement; Sensitivity Analysis; Reactive Power Control