Line differential protection method based on wireless network retransmission mechanism

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...

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

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