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HSR/PRP network sampling synchronization method based on data forwarding time-delay measurement

A technology of forwarding delay and network sampling, applied in synchronization devices, synchronization error correction, digital transmission systems, etc., can solve the problem of HSR/PRP network sampling methods relying on common clock signals and so on

Inactive Publication Date: 2017-11-17
NR ELECTRIC CO LTD +1
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Problems solved by technology

[0007] The purpose of the present invention is: provide a kind of HSR / PRP network sampling synchronization method based on data forwarding delay measurement, solve the problem that HSR / PRP network sampling mode depends on public clock signal

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  • HSR/PRP network sampling synchronization method based on data forwarding time-delay measurement
  • HSR/PRP network sampling synchronization method based on data forwarding time-delay measurement

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Embodiment Construction

[0016] In the application scenario of smart substation HSR / PRP technology, the process layer network is mainly composed of RedBox interface and switch (PRP network). The protection and measurement and control devices all receive SV messages from the merging unit, and the protection and measurement and control devices have sampling synchronization requirements.

[0017] The process of sending SV packets by the merging unit is as follows: figure 2 Shown:

[0018] 1. The merging unit regularly organizes and sends the SV message according to the sending interval, and the merging unit reserves the reserved time field (time field) in the message and clears the value of the time field when organizing the SV message each time.

[0019] 2. The RedBox interface of the merging unit records the current time at the internal message input and output ports respectively, and calculates the difference between the two times to obtain the data forwarding delay △T1, and saves △T1 in the message ...

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Abstract

The invention discloses an HSR / PRP network sampling synchronization method based on data forwarding time-delay measurement, and the method comprises the steps: giving a timestamp to an SV message at the input and output ports of a basic communication unit RedBox of an HSR / PRP network; carrying out the measurement and accumulation of transmission time delay of the SV message on the RedBox, and writing the accumulated time delay into a message time domain, thereby achieving the precise measurement of the accumulated transmission time of the SV message among HSR rings and between the HSR rings and a PRP network; enabling an SV message receiving device (such as a protection device, a measurement and control device) to take a local clock as the reference, and deducing the transmitting moment of an SV message of a merging unit according to a value in a time domain of the received message, thereby achieving the synchronization of sampling data. The method can effectively solve a problem that the sampling synchronization of the HSR / PRP network depends on a public clock signal.

Description

technical field [0001] The invention relates to the technical field of substation protection control, in particular to a method for sampling and synchronizing a substation secondary equipment network using HSR / PRP technology and a device using the method. Background technique [0002] In order to improve the reliability of data transmission, the current smart substation adopts a redundant network mode. In the case of dual-network redundancy and hot standby, a single-network storm will cause the CPU load of the device to become heavy and cannot normally process normal network messages, resulting in the failure to realize The purpose of dual-network hot standby. Parallel Redundancy Protocol (PRP) and High Availability Seamless Ring Protocol (HSR) are two new protocols to realize network redundancy. PRP technology uses completely independent dual networks to realize message hot backup, as long as one set of networks works normally , can ensure that the IED equipment connected ...

Claims

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Application Information

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IPC IPC(8): H04L7/00H02J13/00
CPCH02J13/0006H04L7/0016
Inventor 吕航杨贵李彦李力
Owner NR ELECTRIC CO LTD
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