Composite system reliability evaluation incorporating an HVDC link and a static synchronous series compensator

This paper presents an approach to perform AC/DC system reliability analysis in a composite system where a hybrid compensating scheme is employed in the AC link to adjust the transmission infeed impedance and, therefore, increase the transmission system capacity. The hybrid scheme consists of a static synchronous series compensator (SSSC) and a fixed capacitor. Reliability models associated with a bipolar DC link and the hybrid compensating scheme are developed. A wide range of indices is 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 but typical AC/DC system.