Reliability assessment of AC distribution network with multi-terminal DC interconnection

The distribution system operation in Beijing, China, is investigating on an AC/DC topology for expanding a local distribution system. The feature is to install multi-terminal DC interconnections (MTDI) among three substations, in order to achieve un-interrupted load transfer as well as better loading sharing during primary transformer N-1 outages. This paper presents a reliability assessment of hybrid AC/DC distribution network with the multi-terminal DC interconnection (MTDI). This paper consists of two major parts, which are a reliability model of the MTDI and a power supply restoration scheme. Case studies are performed through a real-life distribution network. The results suggest that reliability of the distribution network can be improved and the capacity of the transformer can be reduced with the joint of MDCI.

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