Analysis of transient stability by using power system stabilizer and static var compensator

In this thesis, the effect of Power System Stabilizer (PSS) and Static Var Compensator (SVC) was analyzed to improve the transient stability of a power transmission system in the case of balanced or unbalanced faults. In the scope of work, a 3-bus power transmission system has been modeled by using MATLAB SIMULINK program. The power transmission system basically consists of three bus systems, two step up transformers and two units (Synchronous Generators). The first Generator generates 1000 MVA and the second one generates 2000 MVA electrical power. The thesis consist of the simulation results for different cases such as with PSS alone, without PSS and with PSS&SVC together in the conditions of various types of faults such Line to Ground (L-G), Line to Line (L-L), Line to Line to Ground (L-L-G), Line to Line to Line (L-L-L) and Line to Line to Line to Ground (L-L-L-G). The results show that PSS&SVC could significantly improve the voltage stability, the active power stability, the reactive power stability, the rotor speed stability and the rotor angle stability of the Synchronous Generators. And also, it could help determining Critical Clearing Times (CCT) that is very important for better relay settings of circuit breakers.