Enhancement of power stability and damping oscillation in multi machine system using SSSC with POD controller

When power system is heavily loaded due to the continuous demand in this case causes active and reactive power to be instable and insufficient. In this thesis, a proper approach has been presented to compensate active and reactive power and also damping oscillations in a multi-machine system consisting of four machines, six buses using Static Synchronous Series Compensator (SSSC). SSSC can be considered one of the most significant series compensation of flexible alternating current transmission system (FACTS) family used in power transmission systems. Both single phase and three phase faults have been considered in the study. Simulation studies of the presented approach have done with SSSC, without SSSC, and finally with SSSC and Power System Damper (POD). Simulation results showed that the system became unstable with oscillations when SSSC has been not used. It can be concluded from simulation results that When SSSC is inserted in the power network, the power transfer is increased and oscillations are reduced. When SSSC is used with POD controller, the system becomes stable in faster way than without controller. In a result, the system performance has been greatly improved and power system oscillations have been reduced and damped out very quickly by using SSSC and POD.