Method and system for time synchronization of high-precision process layer Ethernet switch system
A system time and switch technology, applied in the field of smart substations, can solve the problems of time synchronization, unpredictable software delay, and low time synchronization accuracy, and achieve the effect of solving the impact
Active Publication Date: 2022-03-25
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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[0029] Below in conjunction with embodiment the present invention is further described.
[0030] A high-precision process layer Ethernet switch system time synchronization method, comprising the following steps:
[0031] A. Data collection, 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, where the value range of N can be taken as 10≤N≤20;
[0032] 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 △t1 and △t2 of the two frames of t...
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A high-precision process layer Ethernet switch system time synchronization method and system, the method includes the following steps: A. Data acquisition, obtaining the counter and register values of the time-synchronized message entering the hardware timestamp processing module, and acquiring the time-synchronized message. Time information; obtain N groups of data; B. Perform data filtering on the collected N groups of data and fit the best value by using multiple data processing methods; C. Call the relevant time synchronization process by applying the round-robin function, randomly Collect time information sync in a frame synchronization message time , calculate the time difference value Cdvaue by applying the software response deviation method to the frame message; D. Combine the error values calculated in step B and step C, calculate and set the system synchronization time of the switch as Switch time =sync time +C+Cdvaue. The invention effectively solves the influence of the network card cache effect and the operating system response factor on the system time synchronization.
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