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Electrical system modeling method and fault diagnosis system based on qualitative model

A fault diagnosis system and electrical system technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as the inability to establish a system accuracy model and insufficient acquisition of diagnostic knowledge, and achieve good maintainability, flexible organization, and The effect of improving diagnostic efficiency

Active Publication Date: 2013-11-27
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention proposes a qualitative model-based electrical system modeling method and a fault diagnosis system in order to solve the problems of insufficient diagnostic knowledge acquisition and failure to establish a system accuracy model in the existing electrical system fault diagnosis system

Method used

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  • Electrical system modeling method and fault diagnosis system based on qualitative model
  • Electrical system modeling method and fault diagnosis system based on qualitative model
  • Electrical system modeling method and fault diagnosis system based on qualitative model

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specific Embodiment approach 1

[0041] Specific implementation mode one: as image 3 As shown, the implementation process of a qualitative model-based electrical system modeling method described in this embodiment is as follows:

[0042] Step 1, determine the structure between the various devices in the electrical system, the device is the smallest element of diagnosis;

[0043] Step 2, according to the constraint relationship between the input signal and the output signal of the electrical component under different working states, determine the working mode of each component, including the working mode under the normal state and the working mode under the fault state;

[0044] Step 3, determine the variables used to describe the working status of each component;

[0045] Step 4, define the types and variable instances of all variables;

[0046] Step five, define each component model, and use existing variables to describe all working modes of the component;

[0047] Step 6, define the transition conditio...

specific Embodiment approach 2

[0050] Specific embodiment two: a qualitative model-based electrical system modeling method described in this embodiment, in step two, the working mode of each component in a normal state and the working mode in a fault state are diagnostic knowledge, The description of the working mode in the normal state uses the structural and functional knowledge of the system, and the description of the working mode in the fault state uses the structural and functional characteristics of the system shown in the fault state, as well as empirical knowledge and extracted from historical data. fault characteristics. Other components and connections are the same as those in the first embodiment.

specific Embodiment approach 3

[0051] Specific embodiment three: A qualitative model-based electrical system modeling method described in this embodiment, in step five, the working mode of the electrical component is composed of a normal mode and a fault mode, wherein the normal mode describes the system in the design stage Definite or acceptable working modes with functional results, there are multiple normal modes, each normal mode is switched through state transition conditions;

[0052]Failure modes are those working modes whose functional results are unacceptable. There are multiple failure modes, and the state transition conditions cannot be defined between failure modes;

[0053] The normal mode cannot define the state transition conditions to the fault mode, because the occurrence of faults is random, and only the repairable faults can define the state transition conditions to the normal mode; the definition of the working mode of the component is to establish the input and output of the component T...

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Abstract

The invention relates to the field of fault diagnosis based on models and electrical system faults, in particular to an electrical system modeling method and a fault diagnosis system based on a qualitative model. The electrical system modeling method comprises the steps of determining variables used for describing the working state of each component, defining the types and the variable instances of all the variables, defining each component model, using an existing variable for describing all the working modes of the components, defining the transfer conditions of all the working modes in each component, building modules, instantiating the components in the modules, and describing the structure of the system according to the connecting relations between the components. The system comprises a visual modeling module, a communication module, a model verification module, a scene input module, a diagnosis module and a result displaying module. Through the electrical system modeling method and the fault diagnosis system, the structural knowledge of the system, the functional knowledge of the components forming the system and previous experiential knowledge can be comprehensively utilized to carry out abnormity evaluation and fault location on the current system state, and the electrical system modeling method and the fault diagnosis system are used for improving the accuracy of diagnosis and the distinguishability of diagnosis results.

Description

technical field [0001] The invention relates to the field of fault diagnosis technology based on qualitative model and electrical system fault diagnosis, in particular to a modeling method and fault diagnosis system based on qualitative model. Background technique [0002] The current diagnostic system has the following deficiencies: [0003] First, in the fault diagnosis system based on historical data, because the historical data can only reflect the fault information that has occurred within a certain period of time, but cannot include other system operating characteristics, the result is that the established system model is not complete enough , can only be effective for certain fault characteristics; [0004] Second, in the fault diagnosis system based on empirical knowledge, since empirical knowledge is mainly extracted from the description of domain experts, there may be a problem of incomplete knowledge extraction. At the same time, because the knowledge of domain e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 王日新徐敏强金洋
Owner HARBIN INST OF TECH
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