Abstract:
In order to improve the quality and transfer capability of the electrical power system regulation
of voltage within acceptable range is very crucial in modern power system networks. The voltage
stability is determined by magnitude of production and consumption of reactive power. The
major cause of voltage instability is un-regulated reactive power. Static Var Compensators
(SVCs) can provide or consume the reactive power which is necessary to control the dynamic
voltage to get stable and improve voltage stability. Modeling of SVC with controller to improve
the bus voltage stability at Sebeta-II substation network is presented in this thesis work. The line
to ground (LG) fault is considered in this thesis as more than seventy percent occurrence
of fault in the electrical power system network is the LG fault. In this thesis the proposed SVC
controller is a cascade of Proportional Integral Derivative (PID) and Power Oscillation Damping
(POD) which is a suitable for SVC controller.
According to the results obtained from the simulation by using Matlab Simulink software, the
Static VAR compensator has an ability to improve the voltage stability of buses at the substation
network. From the result, injecting PID-POD controlled SVC of 107MVAR rating at 230kV bus
in the network is significantly improve the voltage stability with shorter time during a phase
faulted condition at Sebeta-II substation. It also observed that the voltage magnitude at buses is
increased and with standard range in all buses after installing SVC with PID-POD controller.
From the results for generator connected with PID-POD controlled SVC, the magnitude voltage
of the weakest bus is increased from SVC to and generator rotor speed
deviation is decreased from to
