Mprovement of T Ransient S Tability through Svc

With the growing stress on today’s power systems, many utilities are increasingly and there is a need for inclusion of security analysis capabilities in the energy management systems. Transient Stability analysis is the evaluation of the ability of the power system to withstand to a set of severe but credible contingencies and to survive transition to an acceptable steady state condition. The performance of a power system during a transient period can be obtained from the network performance equations. In transient stability studies a load flow calculation is made first to obtain system conditions prior to the disturbances. After the load flow calculations, the admittance matrix of the network must be modified to reflect the changes in the representation of the network. FACTS technology is a collection of controllers which can be applied individually or in coordination with others to control one or more of the interrelated system parameters, voltage, impedance and phase angle. Static Var Compensator ( SVC) is a FACTS device, which can control voltage at the required bus by means of reactive power compensation, thereby improving the voltage profile of the system. SVCs have been used for high performance steady state and transient voltage control compared with classical shunt compensation. The effectiveness of the proposed method is analysed with IEEE 14-bus test system.