Study and application of switching operation of 10kV lines ring network in urban power distribution network

Switching operation of 10kV line's ring network is one of the effective technical measures to reduce power failure and improve supply reliability of urban power distribution network. The switching operation of ring network in urban power distribution network is not only affected by operation mode of power system and structure of distribution network, but also restrained by factors such as load and voltage difference prior to closing loop operation, and the overlarge circulating power load during closing loop operation can endanger the safety of power distribution network and equipments. Based on the complicated structure of power distribution network with multiple segments and connections in Nanyang city, the mathematic model of switching operation of ring network in power distribution network is established, which conducts load flow calculation and analysis of closing loop operation with the integrated analysis system of power system for 10kV circuits of different 220kV systems and under different operation modes. This is to protect the setting value and dynamic stability limitation checking of the equipment. Through practicing, method of reducing power flow of closing loop can be proposed and the management system of urban distribution ring network operation standard can be established.