Master-slave equipment time synchronization method

Abstract

The invention discloses a master-slave equipment time synchronization method, belongs to the field of computer application, and relates to a synchronization method of sampling data, in particular to atime synchronization method of the master and slave equipment according to the same time source. The method is applied to a transient recording type fault indicator. A time synchronization main station broadcasts a time synchronization command every T milliseconds, and the time synchronization command comprises a current timestamp. The time synchronization main station adjusts a count value in alocal timer according to the difference of the continuous timestamps and the difference of the local time for sending the timestamps; and the slave device receives the time synchronization command, calculates the difference between the time stamps and the local time interval according to the interval between the continuously received time stamps and the local time interval, and adjusts the count value in the local timer according to the difference, thereby achieving the purpose of real-time dynamic tracking time synchronization. By adopting the scheme provided by the invention, the crystal oscillator oscillation count within a certain time is adjusted by taking the timestamp as a reference, the local clocks of the slave equipment are finely adjusted to be synchronous with the host, the clock synchronization of the plurality of slave equipment is realized, and the time difference between the slave equipment is within + / -2 microseconds.

Description

technical field [0001] The invention belongs to the field of computer applications and relates to a synchronization method for sampling data, in particular to a time synchronization method for master and slave devices based on the same time source. Background technique [0002] With the continuous development of science, technology and economy, whether it is enterprises or people's life, the demand for electricity has been further improved, and the State Grid Corporation has taken the power outage time as the assessment standard. In order to reduce the power outage time and quickly find the source of the fault, State Grid Corporation of China has widely used the fault indicator of transient state recording type. Its main feature is to record the three-phase waveform at the time of line failure and upload it to the master station for further analysis of the fault by the master station. This requires the synchronization of the three-phase waveform to be high, and the higher t...

AI Technical Summary

Problems solved by technology

Due to the deviation of the crystal oscillator itself, the error of the time system of the device will gradually increase over time. If this problem is solved by frequent time synchronization, the communication channel will not be able to transmit business data, and more channels need to be added.

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