Time synchronization method suitable for power distribution network

The invention discloses a clock synchronization method for a medium-low voltage distribution network, and the method comprises the steps: injecting a time synchronization characteristic signal at a downstream protection device of a medium-low voltage distribution line, collecting a disturbance signal waveform at an upstream protection device, and recording a local time scale; enabling the downstream protection device to transmit a disturbance signal waveform through a carrier channel and print a local time scale when disturbance starts, and enabling the upstream protection device to determinethe time scale difference of devices at the two ends by calculating the relevancy of the two curves. By implementing the method, the current situation and characteristics of the medium-low voltage power distribution network are fully considered, the influence of channel delay is avoided, a special channel does not need to be additionally laid, and time unification and strict synchronization of sampling moments of two diff