SHUNT AND SERIES FACTS CONTROLLERS FOR POWER SYSTEM TRANSIENT STABILITY IMPROVEMENT

The applications of shunt FACTS devices as Static Var Compensator SVC and Static Synchronous Compensator STATCOM controllers and series FACTS device as Static Synchronous Series Compensator SSSC controllers are thoroughly investigated in this paper to improve the transient stability performance of a power system. Separately and combination of SVC, STATCOM and SSSC controllers are proposed and compared. The effect of combined SVC and STATCOM controllers in enhancing power system transient stability has been examined. By combination among shunt FACTS and with series FACTS, the transient stability performance of the system has been significantly improved than used each one independently. The proposed controllers are tested on a two-area multi-machine power system which is close to realistic interconnected power system model and subjected to a severe disturbance of three-phase fault at the mid-point of one tie line. The nonlinear simulation results are presented to show the effectiveness of the proposed controllers and its ability to provide efficient damping of the system oscillations.