Voltage Stability Analysis with Static Var Compensator (SVC) for Various Faults in Power System with and Without Power System Stabilizers (PSS)

However, in previous study the effect of SVC and PSS on voltage transient in power system with suitable model of these component for various faults such as Single Line to Ground faults (SLG) and Line to line and Line to Line to Ground (LL and LLG) and three phase faults have not been considered and analyzed and investigated. Shunt Flexible AC Transmission System (FACTS) devices, when placed at the mid-point of along transmission line, play an important role in controlling the reactive power Xow to the power network and hence both the system voltage Xuctuions and transient stability. This study deals with the location of a shunt FACTS device to improve transient stability in along transmission line with pre defined direction of real power flow. The validity of the mid-point location of shunt FACTS devices is verified, with various shunt FACTS devices, namely Static Var Compensator (SVC) in a long transmission line using the actual line model. It has been observed that the FACTS devices, when placed slightly oT-centre towards sending-end, give better performance in improving transient stability and the location depends on the amount of local/through load. This study investigates the effects of Static Var Compensator (SVC) on voltage stability of a power system. The functional structure for SVC built with a Thyristor Controlled Reactor (TCR) and its model are described. The model is based on representing the controller as variable impedance that changes with the firing angle of the TCR. A Power System Computer Aided Design /Electromagnetic Transients including DC (PSCAD/EMTDC) is used to carry out simulations of the system under study and detailed results are shown to access the performance of SVC on the voltage stability of the system.