Effects of Operating Configurations of Multi-Terminal HVDC Systems on DC Filter Performance

This paper presents the effects of operating configurations of multi-terminal dc (MTDC) systems on the performance of dc filters. It is the initial treatise on the subject and covers analyses and assessments of the effects. The authors illustrate the general effects by analyzing two multi-terminal systems -- a double bipolar system and a four terminal system derived by the connection of two crossing bipolar lines. By varying such parameters as circuit configurations, operating conditions, ac bus phase difference between terminals, and point of cross-connection, the effect on the dc filter performance is evaluated. A summary is compiled of those parameters which are more significant in the determination of the expectant dc filter performance and the results give insight into specifications of dc filters for MTDC systems.