Method and system for in-district transformer low voltage side communication

The invention provides a method and a system for in-district transformer low voltage side communication. Cross-district power line power frequency communication data are acquired, an in-district power line power frequency communication signal transmission model is built, an in-district power line power frequency communication signal modulation process is simulated through a simulation platform, a modulation waveform for the in-district power line power frequency communication signal is acquired, time points at which an in-district power line power frequency communication transmitting signal and a receiving signal are corresponding to in-district transformer low voltage side voltage changes are searched respectively, and the power line power frequency communication for the in-district transformer low voltage side is built. During the overall process, model building and simulation processing are adopted, the time for the in-district power line power frequency communication transmitting signal and the receiving signal is searched accurately, the power line power frequency communication is built at the in-district transformer low voltage side, and the power line power frequency communication has the advantages of being strong in anti-attenuation and anti-interference abilities, and the built power line power frequency communication at the in-district transformer low voltage side has high reliability.