الفهرس 
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Abstract
In order to demonstrate and understand many operational and
electrical power issues, ”Power Quality” term is identified. Power quality
studies become more important because of the impacts of economic,
operation and safety.
The motivation behind this work is that many industrial consumers
may be economically affected by the quality of power. More automation
and intelligent equipments have lately been heavily inserted in industry.
This means appearance of new electronically devices that are much more
affected by any big changes or deviations in power supplies’ voltages,
currents or frequencies than the previous electromechanically equipments.
from sensitive equipments point of view, quality of the voltage is the
most important part of power quality. Voltage disturbances mainly include
voltage sags, voltage swells, voltage flickers and voltage harmonics. The
definition of ”Swell” is the rise of Root Mean Square value of voltage or
current, at power frequency, to between 110% and 180% of their nominal
value for a period of time between half cycle and one minute. Voltage
swell can blow fuses and trip the circuit breakers due to the creation of
large unbalance current, also can damage transformers, or even make
malfunction or completely shutdown of sensitive equipment in plants.
One of the most efficient techniques used to mitigate voltage swells is
Flexible AC Transmission Systems (FACTS). FACTS forming a modern
trend in control engineering linked to power system, using the more recent
automatic control theories and technologies and the power electronic
circuits and equipments.
The main objective of this research is to give as complete as possible
analysis of voltage swell and their mitigation in power systems. There are
various mathematical models of FACTS devices developed to study
different functions that they can perform in a power system. Studies in the
past focused on making models and estimate the optimum place of FACTS
devices in order to mitigate voltage swell problem. In this approach the
effect of FACTS on the whole network and on the nearby buses is
neglected. So the analysis should be extended to the system level so that to
accurately estimate the involvement of FACTS devices to system swell
performance. This thesis deeply studies the steady state and dynamic