With addition of new captive power plant and increased power transfer, transient stability is much more important for reliable operation. Transient stability evaluation of large scale power systems is an extremely intricate and highly non-linear problem. An important function of transi’ent evaluation is to appraise the capability of the power system to withstand serious contingency in time, so that some emergencies or preventive control can be carried out to prevent system breakdown. In practical operations correct assessment of transient stability for given operating states is necessary and valuable for power system operation. . The damping of power system oscillations after a three phase fault is also analyzed with the introduction of SVC and UPFC on transient stability performance of a power system. A general program for transient stability studies to incorporate FACTS devices is developed using modified partitioned solution approach. The modeling of SVC and UPFC for transient stability evaluation is studied and tested on a 10-Generator, 39 - Bus, New Test System.
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