Due to the improvement of power supply reliability and the increase of power users

the scale and complexity of distribution network are increasing

which increases the difficulty and time of distribution network topology. Therefore

in order to speed up the topology identification

an improved matrix algorithm is proposed

which divides the topology into global topology and local topology

and improves the two topologies respectively. For global topology

node elimination method is used for adjacency matrix

row scanning method is used for connected matrix

and twice node elimination method is used for incidence matrix to form local topology correlation matrix. After global topology

local topology is carried out for displacement switch. Firstly

according to the change of remote signal

it is known which switches in the network are shifted

and then according to local topology correlation matrix

the connection relationship between displacement switches and local network nodes is obtained. Finally

according to these information

the connection matrix is modified locally

and then the line scanning

bus analysis and electrical island analysis of the matrix are carried out to obtain the local topology of the network

which reflects the global topology of the network. The proposed method has a high reliability and wide application range

and can fully improve the efficiency of topology identification.