A Master-Slave Clock Synchronization Method for the Background Flow of Smart Substation Maintenance Business Information

Abstract

The invention discloses a master-slave clock synchronization method of the maintenance service class information background flow of an intelligent substation. The master-slave clock synchronization method includes the following steps that: the master-slave clock background flow delay values of the substation are continuously sampled, so that a master-slave clock delay time sequence is obtained; a probability confidence interval method is adopted to select abnormal values from master-slave clock delay time; a median substitution method is adopted to replace the abnormal values, so that a master-slave clock delay time sequence can be reconstructed; an exponential delay model is adopted to calculate the optimal estimated values of the end delay of a master clock end and a slave clock end; and the optimal estimated values are adopted to correct the delay of the master clock and the slave clock. With the method of the invention adopted, deviation rules of the end background flow delay jitter deviation of the master clock end and the slave clock end are calculated, so that the optimal estimated values of the end delay of the master clock end and the slave clock end can be realized, and therefore, the synchronization stability of the master clock and the slave clock can be improved. With the method adopted, the synchronization error of the intelligent substation can be decreased, and the synchronization accuracy of the intelligent substation can be improved.

Description

technical field [0001] The invention specifically relates to a master-slave clock synchronization method for the background flow of maintenance business information in an intelligent substation. Background technique [0002] With the development of national economy and technology and the improvement of people's living standards, smart grid has been formed. [0003] The smart substation is the supporting node of the smart grid and one of the important supporting contents of the Energy Internet. An important technical standard for smart substations is the IEC61850 standard, which provides a good solution for communication between primary and secondary equipment and between secondary equipment in substations. In the framework of the IEC61850 standard, the IEEE 1588 time synchronization standard (hereinafter referred to as the 1588 standard) is the key to ensuring the intelligence of the substation. The accuracy of the synchronization clock will directly affect the control accu...

AI Technical Summary

Problems solved by technology

[0005] However, due to the irresistible interference factors in the communication network of the smart meter power station, the end-to-end path delay jitter occurs when the master clock and the slave clock are synchronized, which seriously affects the synchronization accuracy and error optimization of the master-slave clock. This may cause a large synchronization error caused by the end-to-end delay jitter of the master-slave clock in the actual substation synchronization process, which seriously affects the safe and reliable operation of the smart substation.

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