High-precision process layer Ethernet switch system time synchronization method and system
A system time and switch technology, applied in the field of smart substations, can solve problems such as time synchronization, inaccurate measurement of information receiving time, failure of switch system time synchronization, etc., to achieve the effect of solving the impact
Active Publication Date: 2019-11-22
长园深瑞继保自动化有限公司
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[0003] However, in the actual smart substation system application, especially when the traditional time synchronization is used in the network, the process layer Ethernet switch system clock synchronization cannot achieve sub-millisecond clock accuracy
There are two main reasons why the time synchronization accuracy of the Ethernet switch system at the process layer is not high. On the one hand, due to the cache effect of the network card of the switch, the switch cannot accurately use which frame among the many received time synchronization information in the cache. The switch system time synchronization is performed on the time information, so this directly leads to the inaccurate measurement of the information receiving time, resulting in the failure of the switch system time synchronization
On the other hand, due to the influence of the operating system process scheduling response time, because the switch operating system adopts the time slice rotation mechanism and schedules through the system interrupt process, it is impossible to control when the time synchronization process is scheduled and when it stops. Therefore, Unpredictability of software delays
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[0032] Below in conjunction with embodiment the present invention is further described.
[0033] A high-precision process layer Ethernet switch system time synchronization method, comprising the following steps:
[0034] A, data acquisition, obtain the counter and register values of the timed message entering the hardware time stamp processing module and obtain the time information in the timed message; obtain N sets of data, wherein the value range of N can be 10≤N≤20;
[0035] When collecting message data, randomly select two frames of timed messages, and calculate the time difference △t1 of receiving the two frames of messages according to the counter difference of any two frames of timed messages entering the buffer area of the switch network card; at the same time, due to the two Each frame message has precise time information, and the difference between the time values in the two frames of messages is recorded as △t2; select the △t1 and △t2 of the two frames of tim...
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The invention relates to a high-precision process layer Ethernet switch system time synchronization method and a high-precision process layer Ethernet switch system time synchronization system. The method comprises the following steps: A, data collection: obtaining the values of a counter and a register of a time synchronization message entering a hardware timestamp processing module, and obtaining the time information in the time synchronization message; acquiring N groups of data; B, performing data filtering and data fitting on the acquired N groups of data in a multi-data processing mode to obtain an optimal value C; C, calling a related time synchronization process by applying a round-robin function, randomly acquiring time information syntime in a certain frame of time tick message,and calculating a time difference Cdvalue by performing a software response deviation method on the frame of time tick message; and D, in combination with the error values calculated in the step B andthe step C, calculating and setting the system synchronization time of the switch to be Switch time = System + C + Cdvalue. The influence of the network card caching effect and the operating system response factor on the system time synchronization is effectively solved.
Description
technical field [0001] The invention relates to the field of intelligent substations, in particular to a high-precision process layer Ethernet switch system time synchronization method and system. Background technique [0002] In the smart substation system, there is usually a time synchronization mechanism, which is used to determine the order of various events in each system, coordinate the transmission of various messages, and so on. Especially in the process layer Ethernet switch in the smart substation, as the core device of the smart substation system, when an emergency occurs in the substation, the message will first pass through the process layer Ethernet switch and then sent to other protection, measurement and control devices to ensure that the entire The time unification of the switch system can more accurately locate the occurrence time of emergencies. Therefore, how to obtain accurate and reliable system time on the switch system has become an important issue. ...
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IPC IPC(8): H04J3/06
CPCH04J3/0661
Inventor 陈远生杨庆许平凡翁铖谢杰勇
Owner 长园深瑞继保自动化有限公司