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Data transmission method and system based on intelligent substation clock synchronization

A data transmission method and technology of a data transmission system, applied in digital transmission systems, transmission systems, time division multiplexing systems, etc., can solve problems such as inconsistent path delays and reduced timing accuracy, and achieve consistent two-way path delays , Improving the timing accuracy, and the effect of simple engineering implementation

Pending Publication Date: 2018-08-10
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +1
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AI Technical Summary

Problems solved by technology

[0005] The unified time reference in the smart substation is the basis for the safe and reliable operation of relay protection and other automation devices, and it is also the basis for correct analysis of grid faults and accident causes. In smart substations, due to network congestion, the two-way path Reduced timing accuracy

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  • Data transmission method and system based on intelligent substation clock synchronization
  • Data transmission method and system based on intelligent substation clock synchronization

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Embodiment Construction

[0041] A data transmission method and system based on smart substation clock synchronization provided by the present invention will be further introduced below in conjunction with the accompanying drawings.

[0042] In the previous smart substation communication network, the P2P mode was basically used for time synchronization. In this mode, when calculating the path delay between the slave clock and the master clock, it is assumed that the path delay of the two-way transmission data is the same as premise, and gradually deduce the master-slave clock deviation Offest, but in the smart substation communication network, especially in the process layer network, there is an inconsistency in the size of the two-way data flow, resulting in different congestion conditions, thus waiting time in the output queue of the switch port Different, in this case, it is still assumed that the two-way path delay is the same, which will lead to inaccurate final time synchronization, and even abnor...

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Abstract

The invention relates to a data transmission method and system based on intelligent substation clock synchronization. The method includes the following steps: analyzing a message type corresponding toa data stream according to a transmission mode of the data stream; and assigning an output priority to the data stream according to the message type, and mapping the data stream to an output queue ofa corresponding switch for transmission. According to the data transmission method and system based on intelligent substation clock synchronization provided by the invention, through the steps of analyzing the message type corresponding to the data stream according to the transmission mode of the data stream, assigning the output priority to the data stream according to the message type, and mapping the data stream to the output queue of the corresponding switch for transmission, PDEelay_Rep and PDEelay_Resp messages can be preferentially forwarded even if the messages are in a network congestion state, the bidirectional path delay is basically the same, and the final time synchronization accuracy can be greatly improved.

Description

technical field [0001] The invention relates to the field of smart substation clock synchronization, in particular to a data transmission method and system based on smart substation clock synchronization. Background technique [0002] Intelligence means humanization, which is to make the substation as if it is adjusted by a human. When the low-voltage load increases, the substation sends out enough power to meet the increased load. When the low-voltage load decreases, the substation sends out less power to ensure energy saving. Smart substation adopts advanced, reliable, integrated and environment-friendly intelligent equipment, with the basic requirements of digitalization of whole station information, networking of communication platform, and standardization of information sharing, and automatically completes basic functions such as information collection, measurement, control, protection, measurement and detection. At the same time, it is a substation with advanced functi...

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Application Information

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IPC IPC(8): H04J3/06H04L12/841H04L12/865H04L47/6275
CPCH04J3/0638H04L47/283H04L47/6275
Inventor 王向群孙晓艳黄在朝李炳林郭经红陈磊卜宪德张浩姚启桂邓辉王玮沈文陶静陈伟张增华喻强虞跃刘川张明华吕立冬田文锋姚继明
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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