Prevention of Blackout Using an Automated SCADA System in Case of EEP
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Date
2017-01
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa University
Abstract
Nowadays the stability, reliability, sustainability and security of power system are the main concerning
issues in Ethiopia because of frequently happening disturbances which will lead to total or partial power
system blackout. When disturbances occur in power grid, monitoring and controlling of a power system are
required to stop the grid degradation, restore it to a normal state, and hence minimize the effects of disturbances.
However,
in
wide
area
power
grid
resulting
from
large
and
complex
interconnection
of
power
system
network,
classical
systems
based
on
manual
operation
and
decisions
are
not
able
to
rapidly
respond
for
disturbances,
which
may
cause
a
local
or
complete
system
collapse.
Therefore
the
introduction
of
automated
SCADA
system with advanced measurement and very fast communication technologies provide better
ways to detect rapidly the disturbances and protect the overall grid from the propagation of the fast cascading
outages.
Automation
system
improve
the
performance
by
taking
advantage
of
faster
computer
control
instead
of
human
reaction times and also used to increase the efficiency of control by trading off high
personnel costs for low computer system costs.
This thesis presents the design of an automated SCADA system that can prevent the grid system from
blackout in real time through active and reactive power balancing. Active power and reactive power of the
system are the most essential parameters in the monitoring, control, and protection of power systems and
electric equipments because when a fault or a significant disturbance occurs in a power system, the frequency and
voltage
varies
in
time
and
space.
A modeling of electrical system elements was developed to have a complete one line diagram of the existing
network using DIgSILENT power factory software version 15.1. The study has employed conventional
power flow and dynamic analysis for assessing the stability and reliability of the system. Different type of
faults has been used for the analysis, which leads the system to cascade outage. Finally, to mitigate these
problems, necessary control measures have been presented. The result shows that whatever any disturbance
experienced to grid has been controlled automatically without operator intervention and lead to normal
operation condition. From the test results, the proposed technique presents better controlling method in
comparison with that of the existing manual based control system in black out mitigation along with improvement
in
stability
of
the
system.
The method is implemented on the whole EEP grid and tested on specifically for northern and north western
region.
Description
Keywords
SCADA, RTU, Blackout, EEP, DIgSILENT