Abstract: With the growing power demand , the need for innovative and novel methods to operate large interconnected power system has increased. As a consequence of many widespread blackouts in interconnected power system, the priorities for operation of modern power systems have evolved to the following . Operate the system in such way that power delivered reliably. We will assume that the engineering group who have design the power system transmission and generation system have done so with reliability in mind . Up until now we have been mainly concerned with minimizing the cost of operating in power system .An overriding factor in the operation of a power system is to desire to maintain system security . System security involve Practices design to maintain the system operating when component fail . In earlier days , security assessment in a power system was mainly online in nature .

Keyword: Flexible AC Transmission System (FACTS), Static Var Compensator (SVC), System Security

| DOI: 10.17148/IJIREEICE.2021.9740