A power grid fault diagnosis method considering false faults caused by measurement tampering attacks

A power grid fault and measurement technology, which is applied in the direction of detecting faults according to conductor types, measuring electricity, and fault locations, etc., can solve problems such as auxiliary decision-making for wrong faults, ignoring the cause of faults, and false start-up of the diagnostic system, etc., to achieve a simple model structure, The effect of improving the accurate identification rate of attacks and reducing the scope of diagnosis

Active Publication Date: 2021-06-01
XIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For example, when there is actually no fault in the power system, but the measurement tampering attack tampers with the telemetry information from the remote terminal unit (RTU) or phasor measurement unit (PMU) to obtain information including protection relays and circuit breakers. When a group of false action information of the protective device is formed and a false fault is formed, the existing diagnostic method will immediately start the diagnostic program without considering the real cause of the fault, that is, whether the fault at this time is a real fault or caused by a network attack. spurious fault caused by
This can lead to false start-up of the diagnostic system, which can lead to wrong fault-assisted decisions, resulting in significant economic losses
Therefore, the fault diagnosis method under the measurement tampering attack needs to be studied urgently.

Method used

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  • A power grid fault diagnosis method considering false faults caused by measurement tampering attacks
  • A power grid fault diagnosis method considering false faults caused by measurement tampering attacks
  • A power grid fault diagnosis method considering false faults caused by measurement tampering attacks

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0221] Experimental example 1 is a preset failure scenario of a single component failure under the condition of no measurement tampering attack, and its relevant information is shown in Table 1:

[0222] Table 1

[0223]

[0224] First, step S1 of the method of the present invention is executed, and the suspected fault area is determined in the L3 component; then, step S2 is executed to identify the measurement tampering attack on the L3 component, wherein the measurement tampering result of the line L3 is shown in Figure 11 shown. It should be noted that in this experimental example, the normal characteristic root of the random matrix is ​​marked as a star point, and the attack characteristic root is marked as a square.

[0225] Depend on Figure 11 It can be seen that the characteristic roots of the measurement tampering attack identification random matrix are almost completely distributed between the rings, and all of them are marked as star points, which shows that t...

experiment example 2

[0227] Experimental example 2 is a preset failure scenario of a single component failure when the single component is subjected to a measurement tampering attack. The relevant information is shown in Table 2:

[0228] Table 2

[0229]

[0230] In Experimental Example 2, the target power grid did not actually fail, but the attacker maliciously tampered with the voltage value of line L3, which led to successive actions of the relay protection devices of the L3 element, and finally caused false faults caused by measurement tampering attacks.

[0231] Executing step S1 of the present invention, it is determined that the suspected faulty component is L3. Execute step S2 to obtain the characteristic root distribution of measurement and tampering identification of L3, such as Figure 12 shown.

[0232] Depend on Figure 12 It can be seen that the distribution of the characteristic roots of the measurement tampering attack identification random matrix is ​​relatively scattered, ...

experiment example 3

[0234] Experimental example 3 uses Table 3 to compare the power grid fault diagnosis method provided by the present invention with four existing fault diagnosis methods.

[0235] table 3

[0236]

[0237] It can be seen from Table 3 that the five methods can achieve correct diagnosis without attack, but when a measurement tampering attack occurs, ANN, SVM, and IFSNPS cannot identify false alarm information, resulting in misdiagnosis. However, the method of the present invention can effectively identify the false fault information caused by the attack of measurement tampering, thereby avoiding false startup and false diagnosis of the diagnostic module. In addition, from the point of view of modeling method and modeling time, the method of the present invention is an inference model without complicated learning and training process, so it is obviously better than ANN and SVM in terms of modeling time. From the diagnosis results, since the method of the present invention, ANN...

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Abstract

The invention discloses a power grid fault diagnosis method that takes into account false faults caused by measurement tampering attacks. Firstly, the suspected fault components are determined by using the connection analysis method, thereby narrowing the diagnosis range. Secondly, the present invention uses the random matrix theory and the fuzzy C-means clustering algorithm to determine whether each suspected faulty component is subjected to a measurement tampering attack, effectively solving the problem of fault diagnosis misoperation caused by a measurement tampering attack. Finally, the present invention uses the memory backtracking idea of ​​the memory nerve pulse membrane system to establish a fault diagnosis model that can comprehensively utilize telemetry and telesignaling quantities, which not only changes the original shortcoming of not being able to use telemetry modeling based on production rules, It is also possible to determine the type of fault in the event of a faulty component being diagnosed.

Description

technical field [0001] The invention belongs to the technical field of power grid fault diagnosis, and in particular relates to the design of a power grid fault diagnosis method that takes into account measurement tampering attacks to cause false faults. Background technique [0002] When the power grid fails, massive multi-source heterogeneous fault alarm information will be uploaded from the local automatic device to the dispatch center. The power grid fault diagnosis is to use mathematical tools or artificial intelligence to quickly analyze relevant alarm information, find out the cause of the fault, and then assist the dispatching and operation personnel to analyze and deal with the accident in a timely manner to achieve rapid restoration of power supply to ensure safe and reliable operation of the power grid. Therefore, in recent decades, power grid fault diagnosis technology has attracted the attention of many experts and scholars at home and abroad, and many types of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01R31/08G06F17/16G06F17/18G06K9/62G06N3/04G06N3/08
CPCG01R31/00G01R31/086G01R31/088G06N3/049G06N3/08G06F17/16G06F17/18G06N3/045G06F18/23Y04S10/52
Inventor 王涛刘伟张浩博陈孝天程亮古世甫詹红霞张彼德
Owner XIHUA UNIV
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