Injection signal coding based topology identification method and system for low voltage substation

In view of the low efficiency and low reliability of the traditional topology identification method of distribution station area, this paper proposes a low-voltage station area topology identification method based on injection signal coding. The signal transceiver terminal sends the topology identification signal, which is composed of preamble, equipment ID number and characteristic code composed of multiple groups of characteristic waves. The rest of the signal transceiver terminals judge whether it is on the same branch and the hierarchical relationship through the characteristic code, The intelligent fusion terminal finally realizes the topological relationship of the whole station area by statistics and analysis of the connection relationship and hierarchical relationship between all the branch master tables. A low-voltage distribution station area is selected to verify the topology identification method proposed in this paper. The test results show that the results obtained by this method are consistent with the real household transformer relationship, and the identification accuracy is high, which has certain engineering application value.