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Line differential protection method based on wireless network retransmission mechanism

A wireless network and line differential technology, which is applied to emergency protection circuit devices, error prevention, transmission systems, etc., can solve problems such as invalid data calculation, rapid impact of main protection, etc., and achieve the effect of rapid recovery

Active Publication Date: 2020-05-08
NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD +2
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AI Technical Summary

Problems solved by technology

The loss of one frame of data will lead to invalid data calculation of the data window where the frame data is located, and the loss of transient quantity (such as sudden change) information. For power frequency analog quantity sampling data, it will affect the calculation of 20ms full wave data, based on The differential protection of sampled value transmission will be blocked for at least 20ms, and the rapidity of the main protection will be greatly affected

Method used

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  • Line differential protection method based on wireless network retransmission mechanism
  • Line differential protection method based on wireless network retransmission mechanism
  • Line differential protection method based on wireless network retransmission mechanism

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Embodiment Construction

[0023] The following is a preferred embodiment of the present invention, including an application example using the method of the present invention.

[0024] like figure 1 and figure 2 As shown, the line differential protection method based on the wireless network retransmission mechanism of the present invention includes the following steps:

[0025] 1) The line protection device sends data on the local side and receives data on the opposite side through the 5G wireless network. When the device on the local side receives an abnormal frame of data, it sends a retransmission request flag in the data sent in the next frame, and carries the required retransmission data At the same time, the device on this side sets the full-wave data unavailable flag. At this time, the full-wave algorithm continues to calculate, and the missing data is treated as 0, and the calculation result is unavailable. The sampling number of the cycle is used to indicate that the data of a certain frame ...

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Abstract

The invention belongs to the field of power system relay protection, and relates to a line differential protection method based on a wireless network retransmission mechanism. The method comprises thefollowing steps: a line protection device sends local side data through a 5G wireless network and receives opposite side data; when a certain frame of data is abnormally received by the local side device, a retransmission request mark is sent out in the next frame of sent data and carries the time mark of the data needing to be retransmitted, and after the opposite side device receives the retransmission request, a retransmission data frame and the next frame of data are sent together and carry the retransmission mark; after receiving the retransmission data, the device at the side supplements missing data, carries out differential protection calculation in time, and sends a retransmission success mark to the opposite side at the same time; and if the device on the side does not receive the retransmission data, a secondary retransmission request is sent in the same way, secondary retransmission is performed on the opposite side, and if the secondary retransmission fails, a retransmission failure event is recorded. By adopting the method, the problem that the data window is invalid due to abnormal data transmission of individual frames in line differential protection based on wireless communication is solved.

Description

technical field [0001] The invention belongs to the field of electric power system relay protection, and relates to a line differential protection method based on a wireless network retransmission mechanism. Background technique [0002] With the advantages of high transmission rate and high transmission reliability, 5G wireless communication network is gradually penetrating into various industrial fields; in the field of power system relay protection, line differential protection is the core main protection of line protection, and line protection devices on both sides Data transmission such as current flow is required. Using the 5G wireless communication network to transmit data to the devices on both sides, on the one hand, reduces the construction cost and maintenance cost of the fiber channel, and on the other hand, reduces the failure of the channel due to fiber damage. [0003] The line protection device sends the data of the local side to the opposite side, and recei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H04L1/16
CPCH02H7/262H04L1/1607
Inventor 薛明军张灏邹磊陈实张祥常晓勇周洁刘丽李海滨宋堃李莉李文军韩彦玲虞跃
Owner NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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