Network time synchronization method without special support of exchanger

Abstract

The invention relates to a network time synchronization method without special support of an exchanger. The method is applied to a protection, measurement and control system comprising a sampling unit, a merging unit and a function unit, and a standard time signal is injected into the merging unit to synchronize all clocks. The method is applied to two scenes as follows: (1) when the deviation value between the standard time signal and the original time in the protection, measurement and control system is smaller than a set value, the merging unit calculates the bottom characteristic of delay time to dynamically correct a time delay jitter filter arranged in the protection, measurement and control system to realize time synchronization; and (2) when the deviation value between the standard time signal and the original time in the protection, measurement and control system is greater than or equal to the set value, the merging unit adopts an optimization algorithm to track and adjust the clocks to realize time synchronization. The method realizes the high-precision time synchronization under the functional constraint applied by the protection, measurement and control system, does not need network equipment for networking to provide special hardware support, and is high-efficiency and flexible.

Description

technical field [0001] The invention relates to a network time synchronization method adopted in a substation protection and measurement and control system. Background technique [0002] The precise time protocol suitable for substation measurement and control systems provides networked protection and measurement and control systems with time synchronization performance that may meet the functional requirements, but the protocol does not have a specially specified tracking and adjustment algorithm, and requires networked devices to have hardware-level time Identification support, so it sets technical and cost constraints for its wide application in substation protection and measurement and control systems. [0003] The main methods to solve the time synchronization of the protection and measurement and control system are: [0004] 1. Network time message broadcast [0005] In the system, a device that accepts external time standard injection is designated to be calibrated ...

AI Technical Summary

Problems solved by technology

[0009] Applying the precise time protocol in the protection and measurement system can achieve a high level of time synchronization, but the implementation of this protocol has requirements for system hardware and software, and it needs to be customized for distributed sampling value networking protection and measurement and control systems