Abnormal Judgment Method Based on Goose Dual Network Receiving Mechanism

Abstract

The invention discloses an abnormity judgment method based on a GOOSE dual-network receiving mechanism, and the method comprises the steps: 1, carrying out the processing of GOOSE network storm, carrying out the statistics of GOOSE frames in each second, judging whether a network storm exists or not, filtering a storm message through a CRC filtering method, and guaranteeing the transmission of a normal GOOSE frame; Step 2, processing GOOSE abnormal messages, carrying out independent statistics through abnormal judgment of StNum and SqNum of the GOOSE messages in each network to select correctGOOSE messages, and if the two networks are abnormal at the same time, considering to carry out side restart or network frame loss, and receiving message updating data; And step 3, processing different-source data, and judging whether the different-source data caused by configuration errors exist on the network or not by counting GOOSE heartbeat messages. The method timely discovers abnormity, informs operation and maintenance personnel, and gives a solution.

Description

technical field [0001] The invention specifically relates to an abnormal judgment method based on a GOOSE dual-network receiving mechanism, and belongs to the technical field of electric power system relay protection. Background technique [0002] At present, important information related to the safety of power grid operation, such as start-up, action, and tripping between protection devices in digital substations, smart terminals, and protection devices, is transmitted in GOOSE mode, and GOOSE transmission is based on the publish and subscribe model, without a mutual confirmation mechanism. The reliability of the GOOSE signal can only be guaranteed through the dual-network transmission and retransmission mechanism. [0003] The normal GOOSE dual network receiving mechanism is: 1) When the receiving StNum is greater than the local StNum, update the GOOSE data. 2) When the receiving StNum is less than the local StNum, if the publishing device is restarted, the data will be u...

AI Technical Summary

Problems solved by technology

[0004] In the above method, the criterion for restarting the publisher device is that the publisher sends a message with StNum=1 and SqNum=1. Once the message of the publisher is abnormal or the network in the substation is abnormal, the restart message may be lost, resulting in the long-term failure of GOOSE messages. Update, the protection does not operate correctly when a fault occurs

[0005] In addition, the above method is based on the receiving mechanism under the normal condition of GOOSE transmission in the substation, and does not take into account the uncertainty of the actual site, such as the receiving and judging mechanism under abnormal conditions such as network storms, abnormal switches, unexpected messages, and heterogeneous data.

The GOOSE message transmits important information related to the safety of the power grid. Once the above situation occurs, the protection device cannot guarantee correct action through the current dual-network judgment mechanism.

After the abnormal situation disappears, the protection device cannot automatically restore the original GOOSE dual-network receiving mechanism

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