Analysis and research of municipal distribution network structure

The structure of medium-voltage distribution network is the key factor affecting the reliability of power supply of distribution network, and it is also the critical base for distribution automation and smart distribution grid. Through the research and improvement of common distribution network structure and analysis of common connection patterns of overhead line and cable line, the paper presented multi-segment and multi-contact line, double-ring connection, and n-supply-and-one-backup connection, which are suitable for not only overhead line, but also cable line. The way to solve the increasingly prominent issue of power supply in high-density load area in city is that the double loop of different power supplies must cover each main road of the city. In future, the municipal distribution network structure will be dominated by double multi-segment and multi-contact connection, with the coexistence n-supply-and-one-backup connection and double-ring connections. The planning of distribution network should utilize the contact function of ring main unit and the segmentation function of cable dividing box with double switches to achieve the multi-segment and multi-contact line.