Transformer area topology automatic identification and analysis method based on power frequency communication

The invention discloses a transformer area topology automatic identification and analysis method based on power frequency communication, and the method comprises the following steps: determining the topological relation between the upper and lower levels of each branch according to the relation of different transformer networks, and realizing user change relation identification and transformer area topological relation identification by combining a low-voltage transformer area intelligent management terminal with a meter broadband module; determining an affiliation connection relationship between corresponding lines of the upper and lower branches to obtain a line transformer topology of the transformer area, and starting a topology identification command through carrier broadcast after the distribution transformer terminal receives a master station command, wherein the signal-to-noise ratio analysis is the ratio of signal intensity to noise, finally power frequency zero-crossing signal analysis is carried ou