Damping Improvement Through Tuning Controller Limits Of A Series Facts Device

The external controller (EC) of a series flexible ac transmission system (FACTS) device, which is the series capacitive reactance compensator (SCRC), can provide effective damping of low-frequency oscillations in a power system. The saturation limiter in the EC is used to enforce practical limits resulting from the system restriction such as equipment and component ratings. In this paper, the effect of saturation limits on the overall system dynamic behavior is analyzed. Also, a systematic nonlinear tuning method is proposed to determine the optimal values for saturation limits.