الفهرس 
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Abstract
There has been a continuous need for generating more electrical energy to face
the continuous increase in energy demand to match the increase in world population
worldwide. This renders the increase of the number and size of generating units in the
power systems over the years. Unfortunately, the increase of unit’s size increases the
complexity of their control systems and adversely affects system performance and
stability.
To overcome these problems, a number of techniques has been designed and
implemented to enhance system performance and increase the stability margins.
Modern control techniques and flexible AC Transmission systems (FACTS) are two
different approaches which have been used to overcome problems resulted from
power system complexity and up rating of generating unit outputs. The object of this
thesis is to combine modern control techniques and FACTS to enhance system
performance and increase the stability margin.
A self tuning power system stabilizer is designed for a power system which
consists of a turbo generating unit connected to a large power system via a
transformer and a double circuit transmission line. The algorithm used is simple and is
most suitable for on line application. The results illustrate a significant improvement
in the performance of power systems which include flexible AC Transmission, by
combining self tuning Power System Stabilizers (STPSS) and Static Var Compensator
(SVC).