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Abstract
The rapid development of power electronics technology provides
opportunities to develop new power equipment to improve the
performance of the actual power systems. During the last decade, a
number of control devices called “Flexible AC Transmission Systems”
(FACTS) technology have been proposed and implemented. FACTS
devices can be used for power flow control, voltage regulation, and
enhancement of transient stability and damping of power oscillations.
The possibility to improve the performance of the AC transmission
system utilizing power electronic equipment has been discussed a lot
since about ten years. Some new semiconductor based concepts have
been developed. The Thyristor Controlled Series Capacitor (TCSC) is one
of such concept. By varying the inserted reactance, an immediate and
well-defined impact on the active power flow in the transmission line is
obtained. Several potential applications, specifically power oscillation
damping, benefit from this capability. The concept implied the
requirement to design a semiconductor valve, which can be inserted
directly in the high-voltage power circuit. This certainly presented a
technical challenge but the straightforward approach appeared to be a
cost-effective alternative with small losses.
This thesis presents a detailed model of TCSC to study its effect on
the enhancement of the power network performance. This study covers
the network performance under steady–state and transient conditions. The
model with PID controller is used to control the power flow during steady
state operation and with stability controller to improve system stability
during transient conditions. The MATLAB-Simulink-Toolbox is used to
check the validity of the proposed model by applying it to a simple power
network. Results of the simulated network, on which both controllers
were implemented, are presented and show its effectiveness, and
capability in controlling system variables during steady state and transient
operations.