Abstract:
In recent years, a new technology – Flexible AC Transmission
Systems
(FACTS)
is
introduced
in
the
power
system.
This
technology could increase the transmission line capability, control
the power flow, and enhance the transient stability of the power
system
effectively.
Due
to
the
injection
of
the
FACTS
components; the line parameters of transmission system will be
changed. Therefore, the power system protection relay’s operation
will be influenced.
This dissertation explores an apparent impedance calculation
procedure for transmission line incorporating Static Synchronous
Compensator (STATCOM) (which is a vigorous component of
FACTS) based on the power frequency sequence circuits. A
detailed model of 6 pulses STATCOM and its control and a mho
relay model are proposed and integrated into the transmission
system using Power Systems Computer Aided Design (PSCAD)
software.
The simulation results of the application of conventional
distance relay for the protection of transmission line incorporating
STATCOM are presented. The simulation results carried out by
PSCAD software and the analytical calculations show the impact
of STATCOM on the distance protection relay during the different
fault condition.
The influence of location of STATCOM, the setting of
STATCOM's
reference
voltage
and
the
operation
mode
of
STATCOM on mho distance relay are studied as well. The results
are presented in relation to a typical 220kV, 450Km (Atbara-
Portsudan)
transmission
system
employing
midpoint.
III
STATCOM
at
the