Distribution network differential protection synchronization method and device based on pseudorandom sequence

The invention discloses a distribution network differential protection synchronization method based on a pseudorandom sequence. The method comprises the following steps: S1, loading a carrier sequence model used for enabling a current transformer to perform synchronous confirmation; the carrier sequence model comprises a PN sequence model adopting a PN sequence as a pseudo-random sequence; s2, the PN sequence model is propagated to the current transformers located at a power transmission end through a base station, and the current transformers located at different positions of the power transmission end extract the PN sequence model at the same sampling rate; s3, performing synchronous judgment on the PN sequence model extracted in the step S2; s4, performing differential protection on the power transmission end if synchronization is performed according to a judgment result of the step S3; and if not, asynchronous time difference identification is carried out to carry out rapid synchronous response, synchroni