Second Pulse Synchronization Method Based on Merging Unit SV Packet Sampling Number Learning

Abstract

The invention discloses a pulse per second synchronization method based on merging unit SV message sampling sequence number learning, which does not rely on an external clock synchronization apparatus and is suitable for pulse per second synchronization of a protection measurement and control apparatus (including a protection apparatus, a measurement and control apparatus, a protection and measurement and control integrated apparatus, and a station domain protection control apparatus). According to the continuity and interval time of a merging unit sampling sequence number, validity is determined, under the condition of the validity, actual pulse per second generating time is calculated through subtracting rated delay time and transmission time from message receiving time of a merging unit sampling sequence number of zero, and a pulse per second width is calculated through the multi-frame message receiving time of the merging unit sampling sequence number of zero; and the protection measurement and control apparatus, according to a merging unit sampling message synchronization sign, automatically selects a merging unit as a reference time source and at least calculates the pulse per second of two merging units for realizing seamless switching of the reference time source of the merging unit when the reference source merging unit is converted from synchronization to desynchronizing or has broken link abnormities.

Description

technical field [0001] The invention relates to a pulse-per-second synchronization method based on the learning of sampling sequence numbers of SV messages of a merging unit, and belongs to the technical field of electric power system automation control. Background technique [0002] When the synchronous clock signal of protection measurement and control devices (including but not limited to protection devices, measurement and control devices, integrated protection measurement and control devices, and station domain protection and control devices) may not be connected or has been connected but abnormalities such as circuit breakage occur during operation , leading to errors in synchronous interpolation and resampling of protection measurement and control devices and deviations in time stamps of event messages, which affects the reliability of device operation and makes it inconvenient to analyze events according to the sequence of time. [0003] There are four methods of pul...

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Problems solved by technology

[0006] The disadvantage of this method is that it depends on the output of the clock synchronization device and increases the access of the clock synchronization cable loop. When the on-site clock synchronization device is not connected or has been connected but abnormalities such as link disconnection occur during operation, it is impossible to monitor and control the protection. device time synchronization

[0009] The disadvantage of this method is that it depends on the output of the clock synchronization device and increases the access of the clock synchronization cable loop. When the on-site clock synchronization device is not connected or has been connected but abnormalities such as link disconnection occur during operation, it is impossible to monitor and control the protection. device time synchronization

[0012] The disadvantage of this method is: the time error is large, and the error range is 1-50 milliseconds

[0015] The disadvantages of this method are: insufficient reliability, domestic application is not common, and there are very few manufacturers

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