Abstract: Study of low frequency oscillation is very important in power system stability studies, it is play a vital role in maximum power transfer and optimal power system security. These oscillation concern units on different area on the system and hence may result in a higher oscillation on the tie-line. A solution to this problem is the addition of power system stabilizers on the generators on the power system to the automatic voltage regulator. A two-area system is used to understand the nature of these oscillation and the solution were applied. The low frequency oscillation of concerned are inter-area mode oscillations.

Keywords: Inter-area oscillations, Modal Analysis, Mode Shape, Participation Factor, PSS.