Incorporation of a DC-link in a composite system adequacy assessment-DC system modelling

Direct current (DC) links are finding increasing use throughout the world in the form of long-distance transmission and asynchronous interconnections. System reliability studies of a composite generation and transmission system containing a DC link involve modelling and evaluation of the reliability of the DC transmission line and performance of an overall composite system study with the DC link forming an integral part. The authors illustrate a technique for DC system reliability analysis using the contingency enumeration approach. A key element in this system reliability analysis is the creation of the reliability diagram from the single line diagram. A digital computer program was developed to evaluate the probability of failure, frequency of failure, and the mean duration of the possible performance levels for a DC link. The procedure and program were tested on a model DC system, and the results are presented to illustrate a proposed technique