Power System’s Voltage Stability Improvement Using StaticVar Compensator
2014
In alternating current systems, voltage
fluctuation is a common phenomenon. Most of the voltage
fluctuation problems result from the changes in the system’s
reactive power resulting from excessive supply or
consumption of reactive power by the elements of the system
and the variation in the consumers’ loads. In this paper, the
effect of Static Var Compensator (SVC) in stabilizing power
system’s voltage through effective reactive power
compensation was investigated. Power flow equations
involving voltage drop with/without SVC were developed.
SVC modeling equations were also developed and used to
determine its parameters. Based on the SVC parameters,
SIMULINK blocks were used to implement the phase
controlled Thyristor–Controlled-Reactor Fixed-Capacitor
(TCR-FC) SVC. The Nigerian 28-bus power system used for
the study was also modeled using SIMULINK/MATLAB. The
28-bus system was first simulated without SVC and then with
two SVCs located at different buses to obtain the bus voltages
in both cases. From the bus voltages the total voltage drops
for the system with and without SVC were estimated and
compared. The compared results clearly showed that, the
system’s voltage drop was reduced by 33.78% indicating a
significant improvement in the system’s voltage stability when
SVCs were applied.
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