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Improved Hidden Fault Detection Method Considering Information Uncertainty

A technology of uncertainty and hidden faults, applied in the direction of calculation, measuring electricity, measuring devices, etc., can solve problems such as multiple solutions, inaccurate model solution, difficult model solution, etc., to improve speed and accuracy, and good fault tolerance Effect

Active Publication Date: 2019-09-24
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its advantage is that it proposes a new method for detecting hidden faults. The disadvantage is that the model is difficult to solve, and it is prone to multiple solutions, which leads to inaccurate model solutions.

Method used

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  • Improved Hidden Fault Detection Method Considering Information Uncertainty
  • Improved Hidden Fault Detection Method Considering Information Uncertainty
  • Improved Hidden Fault Detection Method Considering Information Uncertainty

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Embodiment Construction

[0023] This embodiment includes the following steps:

[0024] 1) Determine the suspicious fault line and original component set by identifying the boundary circuit breaker of the fault area. Considering the start-up and return of the far backup protection, the boundary of the fault area is extended to the lower line by one level. After identifying the fault area and collecting signals of the protection information system, determine the set S of suspicious fault components * , the set of suspicious fault lines P * and the circuit breaker set C * . and according to S * ,P * Determine the protection set A to be resolved * , R * , B * 、H * .

[0025] 2) Analyze the protection rules within the fault range to obtain the expected expression of each signal. The full analytical model of hidden fault detection can be expressed abstractly as: Where: S={s 1 ,s 2 ...s M} is the set of suspicious fault components, s m = 1 means the mth element is faulty, s m =0 means that ...

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Abstract

The invention discloses an improved covert fault detection method capable of considering information uncertainty. The improved covert fault detection method comprises the following steps: through the identification of a fault area and the collection of the signals of an information protection system, determining a suspected fault element set and a circuit breaker set; according to a protection rule, analyzing to obtain the expected expression of each signal, and constructing and simplifying an analysis model; then, establishing a target planning function, and utilizing a discrete particle swarm algorithm to carry out optimization solution; aiming at the uncertainty probabilities of different practical situation faults, establishing a solution set evaluation index, and determining a practical optimal solution; and finally, comparing an optimal solution set and a collected signal set to determine protection equipment which has the covert fault. The improved covert fault detection method can improve solving speed and precision and eliminate the situation of the wrong solution or error solution of an original method. Meanwhile, a probability module which considers the information uncertainty is added to distinguish the detection results of different areas. The improved method performs multiple and important functions on the detection of the convert fault of a relay protection device.

Description

technical field [0001] The invention relates to a technology in the field of electric power system relay protection, in particular to an improved hidden fault detection method considering information uncertainty. Background technique [0002] The North American Electric Reliability Corporation (NERC) pointed out in an analysis report on major power grid accidents from 1988 to 1996 that 70% of N-2 outages were caused by malfunctions of relay protection systems. The large-scale power outages in Brazil in 2011 and India in 2012 were also caused by hidden faults in the relay protection system. Operation statistics in recent years show that the proportion of malfunctions caused by operation reasons of relay protection devices is more than 50% (Zhang Lie, Lv Pengfei, Shen Hua, etc., Wang Wenhuan. In 2013, the State Grid Corporation 220kV and above voltage level AC system succession Analysis of electrical protection equipment and its operation [J]. Grid Technology, 2015, 04: 1153-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50G01R31/00G06Q50/06
CPCG01R31/00G06F30/00G06Q50/06
Inventor 田园胡炎邰能灵范春菊
Owner SHANGHAI JIAOTONG UNIV