Abstract: The problems of newly emerging
electrical power system are increasing and
becoming challenges for power system
stability, and mainly to the aspects of the
transient stability in electrical power system.
The power system stability plays an important
role in ensuring the fulfilled stable operating
condition of power system during abnormal
events like disturbances or faults taking place
in the system. In order to enhance the power
system stability and performance of the
system, FACTS devices are used in the
transmission line. The features and
applications of FACTS controllers permits to
improve the power system stability and also
these controllers are used in controlling the
power flow of the system. The simulation
results here demonstrate the effect of SVC on
the various parameters (mainly Rotor angle
and load current) of the system.
Keywords: FACTS, SVC, Power System
Stability, PI Controller, Rotor Angle, Fuzzy
Logic Controller, Voltage Stability, Load
Current
I. INTRODUCTION
In upcoming years, the demand for electrical
power by the industries has been increased
continuously. To fulfil this increased demand
for power, electric power systems are
interconnected to one another to share
electrical supply. As a result, some
transmission lines are over loaded and the
problem of power system stability arises.
Various methods have been developed to
improve the power system stability such as,
power system stabilizer (PSS) and various
types of FACTS devices such as, shunt type
controllers (SVC, STATCOM). However,
modern development of power electronics
introduces the application of flexible ac
transmission system (FACTS) devices in
electrical power systems. FACTS devices can
control the network condition in a very fast
manner. Static VAR compensators (SVC) and
static synchronous compensators (STATCOM)
are FACTS devices that can be connected in
shunt with the transmission line. FACTS
devices improve bus voltage by injecting or
absorbing reactive power. Stability mainly
depends on two parameters including initial
operating conditions and the severity of the
disturbance. FACTS controllers have
capability to enhance and improve the power
system stability, steady state stability as well as
transient stabilities. [1]
The outline of this research paper starts with
first section of Introduction, then moving
towards to Power System stability and Static
Var Compensator (SVC). The next section
explains SIMULINK Model similarly next
section includes the PI controller and its
results. Then comes the Fuzzy Logic controller
and its results in SIMULINK model. The last
section of paper includes Conclusion and
references.
II. POWER SYSTEM STABILITY