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PTP-based clock identification method and device

A PTP and clock technology, which is applied in the field of power system, can solve the problems of misoperation of relay protection devices, production loss, problems with sampling timing reference, etc., and achieve the effect of avoiding losses.

Active Publication Date: 2021-08-31
SIEMENS POWER AUTOMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, if there is a hacker attack, such as forging a master clock and sending PTP messages to other slave clocks in the domain, the slave clock is likely to use the forged master clock as the master clock, which will cause sampling If there is a problem with the timing reference, the relay protection device will cause misoperation, and even cause a large loss in production

Method used

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  • PTP-based clock identification method and device
  • PTP-based clock identification method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0056] This embodiment provides a method for identifying a clock based on PTP, where the subject of execution is a device for identifying a clock based on PTP, and the device may be integrated in a slave clock.

[0057] Such as figure 1 As shown, it is a schematic flow chart of the method for clock identification based on PTP according to this embodiment, the method includes:

[0058] Step 100, receiving a PTP message sent by a master clock.

[0059] PTP packets are packets based on the PTP protocol. The PTP message at least includes a synchronization message and an announcement message. In fact, the device may receive PTP messages sent by multiple master clocks, and subsequently determine which master clock to use as a synchronized clock according to the PTP messages. In the prior art, there are already many methods for calculating which is the best master clock for the slave clock. For example, the PTP-based clock identification device can determine the final syn...

Embodiment 2

[0077] In this embodiment, a specific example is given to illustrate the PTP-based clock identification method in Embodiment 1. In this embodiment, it is determined whether the main clock is a synchronizable clock according to the frequency offset.

[0078] Step 200, receiving a PTP message sent by a master clock.

[0079] This step is consistent with step 100 and will not be repeated here.

[0080] Step 201: Determine the first frequency stability of the master clock according to the PTP message, where the first frequency stability is information carried in the PTP message and used to indicate the frequency stability of the master clock.

[0081] The first frequency stability can be used K m To represent. This step is consistent with step 101 and will not be repeated here.

[0082] Step 202: Determine a second frequency stability according to the PTP message, where the second frequency stability is determined based on the actual frequency of the master clock. ...

Embodiment 3

[0095] In this embodiment, a specific example is given to illustrate the PTP-based clock identification method in Embodiment 1. In this embodiment, it is determined whether the master clock is a clock that can be synchronized according to the PTP variance.

[0096] Step 300, receiving a PTP message sent by a master clock.

[0097] This step is consistent with step 100 and will not be repeated here.

[0098] In step 301, the information of the PTP variance of the master clock of the PTP message is used as the first frequency stability.

[0099] Specifically, the first frequency stability may be the ratio of the clockAccuracy field in the announcement message divided by the period of the announcement message. Assuming that the clockAccuracy field is 1 μs and the period of the announcement message is 1s, the first frequency stability is 1PPM.

[0100] This step is consistent with step 101 and will not be repeated here.

[0101] Step 302: Determine the actual PTP...

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Abstract

The invention provides a PTP-based clock identification method and device. The method comprises the following steps: receiving a PTP message sent by a master clock; determining the first frequency stability of the master clock according to the PTP message, wherein the first frequency stability is information which is carried in the PTP message and is used for representing the frequency stability of the master clock; determining a second frequency stability according to the PTP message, wherein the second frequency stability is determined based on the actual frequency of the master clock; determining whether the deviation between the first frequency stability and the second frequency stability meets a preset condition or not; and if so, taking the master clock as a synchronizable clock. According to the invention, a counterfeited master clock can be identified in time.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a PTP-based clock identification method and device. Background technique [0002] PTP (Precision Time Protocol) is a high-precision time synchronization protocol. It is a master-slave synchronization system and uses hardware time stamps. Various PTP messages are defined in the PTP protocol, including a synchronization message (Syncmessage) and an announcement message (Announce message). The synchronization message is sent periodically from the master clock, which contains the clock properties required by the master clock algorithm, and also contains a timestamp that accurately describes the estimated time when the packet was sent. Declaration message The master clock sends out the characteristic information of its own clock, such as information about the frequency, and the slave clocks in the domain use this message for the optimal master clock algorithm. For example, the slave clo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06
CPCH04J3/0667
Inventor 王磊陈吉范璐王龙天王璐谢泠
Owner SIEMENS POWER AUTOMATION
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