The growth of the modern power system with the continuous change in power demand and
supply has led to an increasing complexity in the study of power systems analysis, and in particular, to the aspects of transient stability and small-signal stability. The enhancement of power system stability using PSS (power system stabilizer) which is used to improve low frequency oscillations as a type of the rotor angle stability and STATCOM-POD (Static Synchronous Compensator with power oscillation damper) which is an effective FACTS (Flexible AC Transmission System) device capable of controlling the active and reactive power flows in a transmission line by controlling appropriately parameters also improve low frequency oscillations due to POD controller with STATCOM. In this Paper comparison between PSS and STATCOM-POD performance for power system stability enhancement of the 14-bus test system network is investigated. The comparison is based on investigation of the eigenvalues of the linearized power system model in the framework of dynamic hopf- bifurcation theory.
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