Small signal security quantification of highly loaded power systems

In this paper a concept of quantifying small signal security of power systems is introduced. The concept includes employment of a security index identifying system oscillation modes of insufficient characteristics. If referred to a security constraint the index quantifies mode security and if applied in sensitivity study it gives mode security variation in respect to changes in the system. The concept is applied in a study case considering model of a large power system. For the purpose the well established simulator is used.