CN113933707A

CN113933707A - Self-adjusting method for judging reliability of fault reason of generator set

Info

Publication number: CN113933707A
Application number: CN202111186278.9A
Authority: CN
Inventors: 孙永鑫; 高洪军; 杨世海; 冯超; 魏立华
Original assignee: Harbin Electric Machinery Co Ltd; Huaneng Yarlung Tsangpo River Hydropower Development Investment Co Ltd
Current assignee: Harbin Electric Machinery Co Ltd; Huaneng Yarlung Tsangpo River Hydropower Development Investment Co Ltd
Priority date: 2021-10-12
Filing date: 2021-10-12
Publication date: 2022-01-14
Anticipated expiration: 2041-10-12
Also published as: CN113933707B

Abstract

The invention discloses a self-adjusting method for judging reliability of a fault reason of a generator set, and belongs to the field of intelligent operation and maintenance of generator sets. According to the method, a fault reason criterion result in a fault diagnosis system is determined according to on-line monitoring point data in the fault diagnosis process of the generator set, and the reliability of fault reason judgment is automatically corrected and updated in real time through a self-adjusting algorithm. The invention has the advantages of clear principle, simple structure, accurate calculation and high operation efficiency, can continuously self-adjust the reliability of each fault reason judgment according to the generator operation monitoring data, ensures that the reliability is consistent with the unit deterioration degree, improves the accuracy of the fault diagnosis reason probability, and provides scientific and effective technical support for realizing automation and intellectualization of the generator unit fault diagnosis.

Description

Self-adjusting method for judging reliability of fault reason of generator set

Technical Field

The invention relates to the field of intelligent operation and maintenance of a generator set, in particular to a self-adjusting method for judging reliability of fault reasons of the generator set.

Background

The fault diagnosis and the reason judgment are important components in the intelligent operation and maintenance field of the generator set. Accurate fault diagnosis and reason judgment can ensure that the reason of the fault is quickly positioned when the generator set has problems, and corresponding processing measures and schemes are made, thereby providing powerful support for intelligent maintenance decision of the generator set.

In the fault cause judgment of the generator set, the reliability of the judgment result is an important index for determining the correctness of the reasoning result. In the conventional fault cause diagnosis method, the reliability of the judgment structure is usually a fixed value, is determined according to expert experience, and is not changed along with the operation parameters of the group. The method can obtain the probability of the failure reason of the unit, but can not establish direct connection with the running state of the unit, so that the inference result and the actual working condition have larger difference.

In view of this, it is necessary to develop a self-adjusting method for determining reliability of a fault cause of a generator set. The method needs to consider the influence of the measured point data on the reliability of the fault reason judgment when the unit runs, the more normal the measured point data is, the smaller the reliability of the fault reason judgment is, the more abnormal the measured point data is, the greater the reliability of the fault reason judgment is, so that the strong correlation between the unit running condition and the reliability of the fault reason judgment is achieved, the reliability of the fault reason judgment is automatically adjusted and updated in real time along with the measured point data, and the judgment result of the fault diagnosis reason of the generator set is ensured to be consistent with the running state of the unit all the time.

Disclosure of Invention

The invention aims to provide a self-adjusting method for judging reliability of a fault reason of a generator set, and the technical scheme of the invention comprises the following steps:

The method comprises the following steps: establishing a method for judging fault reasons of the generator set according to the design and operation principle of the generator set, and determining that k fault reason criteria are provided for one fault reason A, wherein the k fault reason criteria are c₁、c₂、…、c_kFor i ≦ 1 ≦ k, when all k cause criteria c_iIf both are true, the fault reason A is true, and when any reason is judged as c_iIf it is false, thenThe failure cause A is false;

step two: criterion c for each cause of failure_iAll the unified logic judgment modes are L_i1≤T_i≤L_i2Wherein T is_iCriterion c for indicating fault cause_iCorresponding measured point data of, L_i1Representing measured point data T_iLower limit of (D), L_i2Representing measured point data T_iUpper limit of (c) when all k causal criteria are_iWhen all are true, the reason is judged as c_iAnd the corresponding criterion value L_iLinear normalization processing is carried out to obtain a criterion value L_iExpressed as:

step three: the lower limit of the reliability of the judgment of the failure reason A is set as R₁The upper limit of reliability of the failure cause A judgment is R₂According to the criterion c of each fault reason in the step two_iIs determined by the criterion value L_iAnd obtaining the reliability R when the fault reason A is judged to be true:

step four: and repeating the first step, the second step and the third step to obtain the credibility of each fault reason when the fault reason is judged to be true, and further comprehensively obtaining the occurrence probability of each fault reason.

In the self-adjusting method for judging reliability of fault reasons of the generator set, in the second step, each fault reason criterion c is determined_iHas and only one corresponding measuring point data T_i。

In the self-adjusting method for judging reliability of fault reasons of the generator set, in the second step, a reason criterion c is adopted_iCorresponding criterion value L_iSatisfies 0<L_i≤1。

In the self-adjusting method for judging reliability of fault cause of the generator set, in the third step, the reliability when the fault cause A is judged to be true is judgedDegree R satisfies R₁<R≤R₂。

The invention has the beneficial effects that:

the self-adjusting method for judging the reliability of the fault reason of the generator set, provided by the invention, has the following technical effects:

1. and the reliability of fault reason judgment is adaptive to the state of the unit. In the process of determining the reliability of fault cause judgment, the influence of the unit state monitoring data on the reliability is considered, and the reliability change trend is adaptive to the unit state.

2. And adjusting the fault reason judgment credibility result in real time. The state monitoring data of the unit is refreshed in real time, so that the automatic adjustment and real-time update of the judgment reliability of the fault reason are realized, and the fault diagnosis result is ensured to meet the requirement of the dynamic change of the unit.

Drawings

FIG. 1 is a flow chart of a self-adjusting method for determining reliability of a fault cause of a generator set.

Detailed Description

The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.

A self-adjusting method for judging reliability of a fault reason of a generator set comprises the following steps:

the method comprises the following steps: establishing a method for judging fault reasons of the generator set according to the design and operation principle of the generator set, and determining that k fault reason criteria are provided for one fault reason A, wherein the k fault reason criteria are c₁、c₂、…、c_kFor i ≦ 1 ≦ k, when all k cause criteria c_iIf both are true, the fault reason A is true, and when any reason is judged as c_iIf the result is false, the fault reason A is false; in this step when c_iWhen the false is taken as the criterion, c can be taken_iConvert to self complement as the cause criterion to ensure all c_iIf true, the failure cause a is true.

Step two: criterion c for each cause of failure_iAll the unified logic judgment modes are L_i1≤T_i≤L_i2Wherein T is_iCriterion c for indicating fault cause_iCorresponding measured point data of, L_i1Representing measured point data T _iLower limit of (D), L_i2Representing measured point data T_iUpper limit of (c) when all k causal criteria are_iWhen all are true, the reason is judged as c_iAnd the corresponding criterion value L_iLinear normalization processing is carried out to obtain a criterion value L_iExpressed as:

criterion c for each fault reason in the step_iHas and only one corresponding measuring point data T_iThe reason criterion c_iCorresponding criterion value L_iSatisfies 0<L_iLess than or equal to 1; the purpose of this step is to establish a criterion value L_iAnd measurement point data T_iThe relationship between the point data T and the point data_iThe larger the value, the higher the deterioration degree, and the criterion value L_iThe larger.

the reliability R when the fault cause A is judged to be true in the step satisfies R₁<R≤R₂(ii) a The purpose of the step is to adjust the credibility R by using all the criterion values judged by the fault reason A, wherein the larger each criterion value is, the larger the adjusted credibility R is, and the higher the occurrence probability of the fault reason A is.

Step four: and repeating the first step, the second step and the third step to obtain the credibility of each fault reason when the fault reason is judged to be true, and further comprehensively obtaining the occurrence probability of each fault reason. The purpose of the step is to realize the self-adjustment of the judgment reliability of the fault reason of the generator set at each moment, ensure the dynamic change of the judgment reliability of the fault reason and ensure that the judgment reliability of the fault reason is consistent with the running condition of the generator set.

The present invention is illustrative only and not intended to limit the scope thereof, and those skilled in the art can make modifications to the present invention without departing from the spirit and scope thereof.

Claims

1. A self-adjusting method for judging reliability of a fault reason of a generator set is characterized by comprising the following steps:

the method comprises the following steps: establishing a method for judging fault reasons of the generator set according to the design and operation principle of the generator set, and determining that k fault reason criteria are provided for one fault reason A, wherein the k fault reason criteria are c₁、c₂、…、c_kFor i ≦ 1 ≦ k, when all k cause criteria c_iIf both are true, the fault reason A is true, and when any reason is judged as c_iIf the result is false, the fault reason A is false;

step three: the lower limit of the reliability of the judgment of the failure reason A is set as R ₁The upper limit of reliability of the failure cause A judgment is R₂According to each event in the second stepCriterion of cause of failure c_iIs determined by the criterion value L_iAnd obtaining the reliability R when the fault reason A is judged to be true:

2. The self-adjusting method for determining reliability of a generator set fault cause according to claim 1, comprising: in the second step, each fault reason criterion c_iHas and only one corresponding measuring point data T_i。

3. The self-adjusting method for determining reliability of a generator set fault cause according to claim 1, comprising: in the second step, the reason criterion c_iCorresponding criterion value L_iSatisfies 0<L_i≤1。

4. The self-adjusting method for determining reliability of a generator set fault cause according to claim 1, comprising: in the third step, the credibility R when the fault reason A is judged to be true satisfies R₁<R≤R₂。