Transmission system reliability evaluation incorporating HVDC links and FACTS devices

This paper illustrates a technique to perform AC/DC system reliability analysis in a composite system where a TCSC is employed in the AC link to adjust the transmission infeed impedance and therefore increase the transmission system capacity. Reliability models associated with the bipolar DC link and the TCSC are developed. A wide range of indices are calculated at both the load point and system levels using a contingency enumeration technique. The capabilities of the technique and the models presented in the paper are illustrated using a small system.