CN106780111A - Power transmission cable synthetical condition assessment method and system - Google Patents
Power transmission cable synthetical condition assessment method and system Download PDFInfo
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Abstract
The present invention relates to a kind of power transmission cable synthetical condition assessment method and system, its method includes：The related service data of each cable assembly of power transmission cable is obtained, the membership function value of each state grade of each evaluation status amount is determined according to related service data；Obtain the weighted value of each evaluation status amount；Each membership function value after treatment is weighted is weighted to the membership function value of each state grade of each evaluation status amount according to weighted value；Each membership function value after confidence level coefficient corrects weighting respectively, obtains each state grade and probabilistic confidence level functional value of each evaluation status amount；Each state grade and probabilistic confidence level functional value to each evaluation status amount carry out synthesis treatment, obtain each state grade and probabilistic confidence level functional value of power transmission cable and then the comprehensive state of determination power transmission cable.Using the solution of the present invention, the accuracy and confidence level of power transmission cable state estimation can be lifted.
Description
Technical field
The present invention relates to technical field of electric power, more particularly to a kind of power transmission cable synthetical condition assessment method and system.
Background technology
With cable widely using in power network, corresponding O＆M task is arduous all the more, for cable O＆M provides important
The state evaluation of foundation is also important all the more, has thus amplified out the state evaluation of power transmission cable.Indices to cable are carried out
Evaluate and quantify, the numerical value obtained by quantization judges the state of cable, so as to carry out the fault diagnosis of cable to operation maintenance personnel
Important foundation is provided with safeguarding.
At present, the state evaluation to cable mainly uses the cable run state evaluation in transmission line status assessment guidelines
Standard quantifies to the state of each part of cable, and the method is had clear presentation, and is related to cable assembly many, and taxonomic structure is careful, meter
Calculate simple, be easy to operation maintenance personnel to record and calculate.But, the method calculating process excessively simplifies and needs substantial amounts of priori
And human resources, lack the ruuning situation that monitoring device monitors cable in real time.Also there are some to exist on cable status at present
Line assessment method, but these methods do not account for the uncertainty occurred during cable status are evaluated, and these evaluation methods are commented
Valency system is single, and accuracy is low, and confidence level is inadequate.
The content of the invention
It is an object of the invention to provide a kind of power transmission cable synthetical condition assessment method and system, transmission of electricity electricity can be lifted
The accuracy and confidence level of cable state estimation.
The purpose of the present invention is achieved through the following technical solutions：
A kind of power transmission cable synthetical condition assessment method, including：
Obtain the correlation that the operational factor of each cable assembly that real-time watch device monitors power transmission cable to be assessed is obtained
Service data, the related service data includes the monitor value of each evaluation status amount of each cable assembly；
The membership function value of each state grade of each evaluation status amount is determined according to the related service data；
Obtain the weighted value of each evaluation status amount；
Place is weighted to the membership function value of each state grade of each evaluation status amount according to the weighted value
Reason, the membership function value of each state grade of each described evaluation status amount after being weighted；
The degree of membership letter of each state grade of each described evaluation status amount after confidence level coefficient corrects weighting respectively
Numerical value, obtains each state grade and probabilistic confidence level functional value of each evaluation status amount；
According to default composition rule to each state grade and probabilistic confidence level letter of each evaluation status amount
Numerical value carries out synthesis treatment, obtains each state grade and probabilistic confidence level functional value of the power transmission cable；
Each state grade and probabilistic confidence level functional value according to the power transmission cable determine the power transmission cable
Comprehensive state.
A kind of power transmission cable synthetical condition assessment system, including：
Data capture unit, for obtaining the fortune that real-time watch device monitors each cable assembly of power transmission cable to be assessed
The related service data that line parameter is obtained, the related service data includes the prison of each evaluation status amount of each cable assembly
Measured value；
Degree of membership computing unit, each state etc. for determining each evaluation status amount according to the related service data
The membership function value of level；
Weight calculation unit, the weighted value for obtaining each evaluation status amount；
Weighted units, for according to the weighted value to the membership function of each state grade of each evaluation status amount
Value is weighted treatment, the membership function value of each state grade of each described evaluation status amount after being weighted；
Amending unit, for each state of each described evaluation status amount after confidence level coefficient corrects weighting respectively etc.
The membership function value of level, obtains each state grade and probabilistic confidence level functional value of each evaluation status amount；
Integrated unit, for according to default composition rule is to each state grade of each evaluation status amount and does not know
The confidence level functional value of property carries out synthesis treatment, obtains each state grade and probabilistic confidence level letter of the power transmission cable
Numerical value；
State determination unit, for each state grade according to the power transmission cable and probabilistic confidence level functional value
Determine the comprehensive state of the power transmission cable.
According to the scheme of the invention described above, it is to obtain each cable that real-time watch device monitors power transmission cable to be assessed
The related service data that the operational factor of part is obtained, the related service data includes each assessment shape of each cable assembly
The monitor value of state amount, the membership function of each state grade of each evaluation status amount is determined according to the related service data
Value, obtains the weighted value of each evaluation status amount, according to the weighted value to the person in servitude of each state grade of each evaluation status amount
Category degree functional value is weighted treatment, the membership function of each state grade of each described evaluation status amount after being weighted
Value, the membership function value of each state grade of each described evaluation status amount after confidence level coefficient corrects weighting respectively,
Each state grade and probabilistic confidence level functional value of each evaluation status amount are obtained, according to default composition rule pair
Each state grade and probabilistic confidence level functional value of each evaluation status amount carry out synthesis treatment, obtain the transmission of electricity
Each state grade of cable and probabilistic confidence level functional value, each state grade according to the power transmission cable and uncertain
The confidence level functional value of property determines the comprehensive state of the power transmission cable.The present invention program is treated based on real-time watch device monitoring
The related service data that the operational factor of each cable assembly of the power transmission cable of assessment is obtained carries out the comprehensive state of power transmission cable
Assessment, and considered in evaluation process cable status assessment in uncertainty, power transmission cable state estimation can be lifted
Accuracy and confidence level.
Brief description of the drawings
Fig. 1 realizes schematic flow sheet for the power transmission cable synthetical condition assessment method of the embodiment of the present invention one；
Fig. 2 is power transmission cable comprehensive state appraisement system figure；
Fig. 3 is the composition structural representation of the power transmission cable synthetical condition assessment system of the embodiment of the present invention two.
Specific embodiment
To make the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, to this
Invention is described in further detail.It should be appreciated that specific embodiment described herein is only used to explain the present invention,
Do not limit protection scope of the present invention.
Embodiment one
The embodiment of the present invention one provides a kind of power transmission cable synthetical condition assessment method, shown in Figure 1, is of the invention real
The power transmission cable synthetical condition assessment method for applying example one realizes schematic flow sheet.As shown in figure 1, the power transmission cable of the present embodiment
Synthetical condition assessment method comprises the following steps：
Step S101：The operational factor for obtaining each cable assembly that real-time watch device monitors power transmission cable to be assessed is obtained
The related service data for obtaining, the related service data includes the monitor value of each evaluation status amount of each cable assembly；
Here, the cable assembly of the power transmission cable includes cable body, cable intermediate joint and cable passage；The electricity
The evaluation status amount of cable body includes oversheath and major insulation, and the evaluation status amount of the cable intermediate joint includes transition joint
Temperature and joint partial discharge, the evaluation status amount of the cable passage include tunnel gas, tunnel humiture, tunnel cigarette sense and catchment
Well.Oversheath may further include the insulaion resistance of oversheath, the A phase currents of oversheath, the B phase currents of oversheath and outer shield
The C phase currents of set；Major insulation may further include the insulaion resistance of major insulation, the A phase currents of major insulation, the B phases of major insulation
The C phase currents of electric current and major insulation；Tunnel gas may further include methane content, carbon monoxide content, sulfur dioxide and contain
Amount and oxygen content.Tunnel humiture may further include tunnel temperature and tunnel humidity, and tunnel cigarette sense can be wrapped further
Cigarette sense state is included, sump may further include electrical source of power state, water level, water pump operation state.
Step S102：The degree of membership of each state grade of each evaluation status amount is determined according to the related service data
Functional value；
Specifically, the person in servitude of each state grade of each evaluation status amount can be calculated according to default fuzzy membership functions
Category degree functional value.
Step S103：Obtain the weighted value of each evaluation status amount；
Specifically, the weighted value of each evaluation status amount can be obtained using analytic hierarchy process (AHP).
Step S104：The membership function value of each state grade of each evaluation status amount is entered according to the weighted value
Row weighting is processed, the membership function value of each state grade of each described evaluation status amount after being weighted；
Specifically, can be multiplied by with the membership function value of each state grade of each evaluation status amount respectively corresponding
The weighted value of evaluation status amount, the membership function value of each state grade of each described evaluation status amount after being weighted.
Step S105：Each state grade of each described evaluation status amount after confidence level coefficient corrects weighting respectively
Membership function value, obtains each state grade and probabilistic confidence level functional value of each evaluation status amount；
Wherein, the size of confidence level coefficient can be selected according to actual needs.
Step S106：According to default composition rule to each state grade of each evaluation status amount and probabilistic
Confidence level functional value carries out synthesis treatment, obtains each state grade and probabilistic confidence level function of the power transmission cable
Value；
Step S107：Described in each state grade and probabilistic confidence level functional value according to the power transmission cable determine
The comprehensive state of power transmission cable；
Specifically, confidence level functional value can be met some state grades for imposing a condition and is defined as the power transmission cable
Comprehensive state.
Accordingly, according to the scheme of above-mentioned the present embodiment, it is to obtain real-time watch device to monitor power transmission cable to be assessed
Each cable assembly the related service data that obtains of operational factor, the related service data includes each cable assembly
The monitor value of each evaluation status amount, the person in servitude of each state grade of each evaluation status amount is determined according to the related service data
Category degree functional value, obtains the weighted value of each evaluation status amount, according to the weighted value to each state of each evaluation status amount
The membership function value of grade is weighted treatment, and each state grade of each described evaluation status amount after being weighted is subordinate to
Degree functional value, the degree of membership letter of each state grade of each described evaluation status amount after confidence level coefficient corrects weighting respectively
Numerical value, obtains each state grade and probabilistic confidence level functional value of each evaluation status amount, according to default synthesis
Rule carries out synthesis treatment to each state grade and probabilistic confidence level functional value of each evaluation status amount, obtains institute
State each state grade and probabilistic confidence level functional value of power transmission cable, each state grade according to the power transmission cable and
Probabilistic confidence level functional value determines the comprehensive state of the power transmission cable.This embodiment scheme is set based on real-time monitoring
The related service data that the operational factor of each cable assembly of standby monitoring power transmission cable to be assessed is obtained carries out power transmission cable
The assessment of comprehensive state, and the uncertainty in cable status assessment is considered in evaluation process, power transmission cable can be lifted
The accuracy and confidence level of state estimation.
Wherein in one embodiment, each shape that each evaluation status amount is determined according to the related service data
The process of the membership function value of state grade can include：The related service data is normalized, normalizing is obtained
Change result；Each shape of each evaluation status amount is determined according to the normalized result and default membership function
The membership function value of state grade.
Specifically, the smaller the better evaluation status amount of logarithm value, such as oversheath earth current, joint partial discharge, using such as
Under formula (1) be normalized；The smaller the better evaluation status amount of logarithm value, such as oversheath insulaion resistance, major insulation
Resistance etc., is normalized using formula below (2).
In formula (1), (2), xrIt is actual measured value；xnrIt is the value after normalization；x0And x1It is the threshold value before normalization, one
As, x1Determined by preventive trial or expert opinion, represent that actual measured value should arouse attention more than setting, x0To evaluate
The factory-said value of index.
Specifically, the membership function that Ban Tiyuban ridges are combined can be selected to determine each state of each evaluation status amount etc.
The membership function value of level, membership function is defined as：
In formula (3), (4), (5) and (6), μ1(xnr)、μ2(xnr)、μ3(xnr) and μ4(xnr) for evaluation status amount on cable
Four kinds of different state grade S1、S2、S3、S4(represent respectively：Normally, note, it is abnormal, serious) membership function value；a1、
a2、a3、a4、a5And a6It is the boundary value between each state grade.
Wherein in one embodiment, the process of the weighted value for obtaining each evaluation status amount can include：By layer
Fractional analysis (Analytic Hierarchy Process, AHP) obtains the weighted value of each evaluation status amount.
Specifically, the process of the weighted value that each evaluation status amount is obtained by analytic hierarchy process (AHP) can include：
Construction fuzzy complementary matrix, the fuzzy complementary matrix is A=(aij)n×n, wherein, aij+aji=1, (i, j=1,
2 ..., n), n represents the quantity of evaluation status amount, aijRepresent aiCompare ajImportant degree, aiRepresent i-th evaluation status amount, aj
Represent j-th evaluation status amount；Quantity scale is carried out to the fuzzy complementary matrix by default scaling law；To scale
The fuzzy complementary matrix afterwards is sued for peace by row；According to bij=(bi-bj)/[2 (n-1)]+0.5 pair of value obtained by row summation enter
Row mathematic(al) manipulation, wherein, biRepresent the value that the i-th row is obtained by row summation, bjRepresent the value that jth row is obtained by row summation, bijTable
Show the value after mathematic(al) manipulation conversion；The weighted value of each evaluation status amount is calculated according to formula below (7)；
In formula (7), wiRepresent i-th weighted value of evaluation status amount, wherein, α ' represent adjusting parameter and α '=(n-1)/
2。
Wherein, the scaling law can be selected according to actual needs, for example, can be 1-9 scaling laws.Obtaining each assessment
After the weighted value of quantity of state, the membership function value and each evaluation status of each state grade of each evaluation status amount can be combined
The weighted value of amount weighted after each described evaluation status amount each state grade membership function value, specifically, can be with
By m 'i(Aj)=wimi(Aj) calculate the membership function value after weighting, m 'i(Aj) represent i-th j-th of evaluation status amount
Membership function value after the weighting of state grade, mi(Aj) represent i-th weighting of j-th state grade of evaluation status amount
Preceding membership function value, wherein i=1,2,3 ..., n, j=1,2,3,4.
It is shown in Figure 2, it is power transmission cable comprehensive state appraisement system figure.As shown in Fig. 2 including electricity including power transmission cable
The state evaluation of the part of cable body, cable intermediate joint and cable passage etc. three；The assessment content of the cable body includes outer
Jacket insulation resistance, oversheath earth current, major insulation insulaion resistance, major insulation Leakage Current etc., cable intermediate joint are commented
Estimating content includes Joint Temperature and joint partial discharge etc., and the assessment content of the cable passage includes tunnel gas, tunnel temperature
Humidity, tunnel cigarette sense and sump etc..
The present invention is different in view of the relative importance of different parts (sub- evidence body), introduces confidence level factor alpha to correct
Brief inference before each sub- evidence body synthesis.Therefore, wherein in one embodiment, it is described to be corrected respectively by confidence level coefficient
The membership function value of each state grade of each described evaluation status amount after weighting, obtains each shape of each evaluation status amount
The process of state grade and probabilistic confidence level functional value can include：According to m, " (A)=α m ' (A), m ' (Θ)=1- α are repaiied
The membership function value of each state grade of each described evaluation status amount after positive weighting, obtains each of each evaluation status amount
State grade and probabilistic confidence level functional value；Wherein, α represents confidence level coefficient, and m ' (A) represents the degree of membership before amendment
Functional value, m " (A) represents revised membership function value, and m ' (Θ) is the brief inference of uncertain evidence, the uncertain card
According to brief inference refer to probabilistic confidence level functional value.
Wherein, it is above-mentioned according to default composition rule to each state grade of each evaluation status amount and probabilistic
Confidence level functional value carries out synthesis treatment, obtains each state grade and probabilistic confidence level function of the power transmission cable
Value, can specifically include：Default composition rule is first according to each state grade of each evaluation status amount and is not known
The confidence level functional value of property carries out synthesis treatment, obtains each state grade and probabilistic confidence level of each cable assembly
Function, secondly, according to default composition rule to each state grade and probabilistic confidence level letter of each cable assembly
Numerical value carries out synthesis treatment, obtains each state grade and probabilistic confidence level functional value of the power transmission cable.
Wherein, be using revised membership function value as D-S evidential reasoning algorithm neutron evidence bodies confidence level letter
Numerical value, each state grade and probabilistic confidence level functional value of the power transmission cable are calculated by D-S blending algorithms.
Specifically, using the different evaluation status amount of same layer in Figure of description 2 and different evaluation means as same
Evidence body different in individual identification framework, for example, the oversheath insulaion resistance and grounding circulation under oversheath in Fig. 2 are used as outer
The sub- evidence body of sheath.Meanwhile, the membership function value of each quantity of state that will also be obtained in above-mentioned calculating is used as sub- evidence body
Belief function value.For the belief function for giving the different evidence bodies in same identification framework, using the conjunction of equation below (8)
The belief function after synthesis is calculated into rule：
In formula, m (A) is the basic trust partition function value of event A, and it represents trusting degree of the evidence for A, its value
N index, A are represented respectively equal to the membership function of event A, 1,2,3...n1∩A2…∩ANIt is the finger of A that=A represents common factor
Mark is all, and φ represents empty set.By above-mentioned composition rule, last belief function distribution can be obtained, i.e., power transmission cable is each
State grade and probabilistic confidence level functional value.
Wherein in one embodiment, each state grade and probabilistic confidence level according to the power transmission cable
Functional value determines that the process of the comprehensive state of the power transmission cable can include：Inquiry confidence level functional value and other state grades
Confidence level functional value difference more than default first threshold, probabilistic confidence level functional value be less than default second threshold
Value and belief function value more than probabilistic confidence level functional value dbjective state grade, the dbjective state grade is true
It is set to the comprehensive state of the power transmission cable.
Specifically, the belief function after being synthesized to sub- evidence body using corresponding inference rule is estimated the final of target
Judge, the final criterion for judging is as follows：
In formula, SiThe state grade for obtaining finally is assessed for cable (equivalent to above-mentioned dbjective state grade)；m(Si) be
The state grade S that assessment is obtainediBelief function value；m(Sj) be other states belief function value；M (Θ) is probabilistic
Belief function value.ε1(equivalent to above-mentioned first threshold) and ε2(equivalent to above-mentioned Second Threshold) is threshold value set in advance.
Specific example
For the ease of understanding the present invention program, illustrated below by way of a specific example.
The evaluation status amount that each evaluation object of power transmission cable is included see the table below 1：
The evaluation status amount that each evaluation object of table 1 is included
| Quantity of state | Oversheath | Major insulation | Cable intermediate joint | Tunnel gas | Tunnel humiture | Tunnel cigarette sense | Sump |
| 1 | Insulaion resistance | Insulaion resistance | Temperature | CH4 micro contents | Tunnel temperature | Cigarette sense state | Electrical source of power state |
| 2 | A phase earth currents | A phase Leakage Currents | Joint partial discharge | CO micro contents | Tunnel humidity | Water level | |
| 3 | B phase earth currents | B phase Leakage Currents | H2S micro contents | Water pump operation state | |||
| 4 | C phase earth currents | C phase Leakage Currents | O2 micro contents |
The related service data provided using the electric company of Zhong Mou cities of table 2 obtains a service data for cable, and calculating is commented
Estimate the comprehensive state of the cable of the simulation.According to above-mentioned estimation flow, following steps result of calculation is obtained.
The service data of table 1
Wherein, each quantity of state is subordinate to the degree of membership result of calculation such as table 3 below of each state：
What each quantity of state of table 3 was subordinate to each state is subordinate to angle value
By the degree of membership in upper table such as table is distributed by obtaining the confidence level of each part (sub- evidence body) after D-S evidence fusions
Shown in 4：
The confidence level distribution of each part of table 4 (sub- evidence body)
The confidence level of each sub- evidence body is finally merged, the confidence level distribution for obtaining comprehensive state of cable is as shown in table 5：
The confidence level distribution of the comprehensive state of cable of table 5
Following opinion can be obtained according to criterion：The comprehensive state of the cable is normal.
Embodiment two
Power transmission cable synthetical condition assessment method in above-described embodiment, it is comprehensive that the present invention also provides a kind of power transmission cable
Conjunction state assessment system, Fig. 3 is the composition structural representation of the power transmission cable synthetical condition assessment system of the embodiment of the present invention two.
As shown in figure 3, the power transmission cable synthetical condition assessment system of the present embodiment two is calculated including data capture unit 201, degree of membership
Unit 202, weight calculation unit 203, weighted units 204, amending unit 205, integrated unit 206 and state determination unit 207,
Wherein：
Data capture unit 201, each cable assembly of power transmission cable to be assessed is monitored for obtaining real-time watch device
The related service data that obtains of operational factor, each evaluation status amount of the related service data including each cable assembly
Monitor value；
Degree of membership computing unit 202, each shape for determining each evaluation status amount according to the related service data
The membership function value of state grade；
Weight calculation unit 203, the weighted value for obtaining each evaluation status amount；
Weighted units 204, for according to the weighted value to the degree of membership of each state grade of each evaluation status amount
Functional value is weighted treatment, the membership function value of each state grade of each described evaluation status amount after being weighted；
Amending unit 205, for each shape of each described evaluation status amount after confidence level coefficient corrects weighting respectively
The membership function value of state grade, obtains each state grade and probabilistic confidence level function of each evaluation status amount
Value；
Integrated unit 206, for according to default composition rule to each state grade of each evaluation status amount and not
Deterministic confidence level functional value carries out synthesis treatment, obtains each state grade and probabilistic confidence of the power transmission cable
Degree functional value；
State determination unit 207, for each state grade according to the power transmission cable and probabilistic confidence level letter
Numerical value determines the comprehensive state of the power transmission cable.
Wherein in one embodiment, degree of membership computing unit 202 can be normalized to the related service data
Treatment, obtains normalized result, and the commentary of each institute is determined according to the normalized result and default membership function
Estimate the membership function value of each state grade of quantity of state.
Wherein in one embodiment, weight calculation unit 203 constructs fuzzy complementary matrix, and the fuzzy complementary matrix is
A=(aij)n×n, wherein, aij+aji=1, (i, j=1,2 ..., n), n represents the quantity of evaluation status amount, aijRepresent aiCompare ajWeight
The degree wanted, aiRepresent i-th evaluation status amount, ajRepresent j-th evaluation status amount；By default scaling law to institute
Stating fuzzy complementary matrix carries out quantity scale；The fuzzy complementary matrix after to scale is sued for peace by row；According to bij=(bi-
bj)/[2 (n-1)]+0.5 pair of value obtained by row summation carry out mathematic(al) manipulation, wherein, biRepresent what the i-th row was obtained by row summation
Value, bjRepresent the value that jth row is obtained by row summation, bijRepresent the value after mathematic(al) manipulation conversion；According toCalculate the weighted value of each evaluation status amount.
Wherein in one embodiment, the cable assembly of the power transmission cable can be including indirect in cable body, cable
Head and cable passage；The evaluation status amount of the cable body includes oversheath and major insulation, and the cable intermediate joint is commented
Estimating quantity of state includes Joint Temperature and joint partial discharge, and the evaluation status amount of the cable passage includes tunnel gas, tunnel
Humiture, tunnel cigarette sense and sump.
Wherein in one embodiment, amending unit 205 can be according to m, and " (A)=α m ' (A), m ' (Θ)=1- α amendments add
The membership function value of each state grade of each described evaluation status amount after power, obtains each state of each evaluation status amount
Grade and probabilistic confidence level functional value；Wherein, α represents confidence level coefficient, and m ' (A) represents the membership function before amendment
Value, m " (A) represents revised membership function value, and m ' (Θ) is the brief inference of uncertain evidence, the uncertain evidence
Brief inference refers to probabilistic confidence level functional value.
Wherein in one embodiment, state determination unit 207 can inquire about confidence level functional value and other state grades
Confidence level functional value difference more than default first threshold, probabilistic confidence level functional value be less than default second threshold
Value and belief function value more than probabilistic confidence level functional value dbjective state grade, the dbjective state grade is true
It is set to the comprehensive state of the power transmission cable.
Power transmission cable synthetical condition assessment system provided in an embodiment of the present invention, it is pointed out that：Above for transmission of electricity
The description of comprehensive state of cable assessment system, the description with above-mentioned power transmission cable synthetical condition assessment method is similar, and
Beneficial effect with above-mentioned power transmission cable synthetical condition assessment method, to save length, repeats no more；Therefore, the above is to this
The ins and outs not disclosed in the power transmission cable synthetical condition assessment system that inventive embodiments are provided, refer to the defeated of above-mentioned offer
The description of electrical cables synthetical condition assessment method.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses several embodiments of the invention, and its description is more specific and detailed, but simultaneously
Can not therefore be construed as limiting the scope of the patent.It should be pointed out that coming for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of power transmission cable synthetical condition assessment method, it is characterised in that including：
Obtain the related operation that the operational factor of each cable assembly that real-time watch device monitors power transmission cable to be assessed is obtained
Data, the related service data includes the monitor value of each evaluation status amount of each cable assembly；
The membership function value of each state grade of each evaluation status amount is determined according to the related service data；
Obtain the weighted value of each evaluation status amount；
Treatment is weighted to the membership function value of each state grade of each evaluation status amount according to the weighted value, is obtained
The membership function value of each state grade of each described evaluation status amount after must weighting；
The membership function value of each state grade of each described evaluation status amount after confidence level coefficient corrects weighting respectively,
Obtain each state grade and probabilistic confidence level functional value of each evaluation status amount；
According to default composition rule to each state grade and probabilistic confidence level functional value of each evaluation status amount
Synthesis treatment is carried out, each state grade and probabilistic confidence level functional value of the power transmission cable is obtained；
Each state grade and probabilistic confidence level functional value according to the power transmission cable determine the comprehensive of the power transmission cable
Conjunction state.
2. power transmission cable synthetical condition assessment method according to claim 1, it is characterised in that described according to the correlation
Service data determines that the process of the membership function value of each state grade of each evaluation status amount includes：
The related service data is normalized, normalized result is obtained；
Each state grade of each evaluation status amount is determined according to the normalized result and default membership function
Membership function value.
3. power transmission cable synthetical condition assessment method according to claim 1, it is characterised in that each assessment shape of acquisition
The process of the weighted value of state amount includes：The weighted value of each evaluation status amount is obtained by analytic hierarchy process (AHP).
4. power transmission cable synthetical condition assessment method according to claim 1, it is characterised in that described by step analysis
The process that method obtains the weighted value of each evaluation status amount includes：
Construction fuzzy complementary matrix, the fuzzy complementary matrix is A=(aij)n×n, wherein, aij+aji=1, (i, j=1,2 ...,
N), n represents the quantity of evaluation status amount, aijRepresent aiCompare ajImportant degree, aiRepresent i-th evaluation status amount, ajRepresent table
Show j-th evaluation status amount；
Quantity scale is carried out to the fuzzy complementary matrix by default scaling law；
The fuzzy complementary matrix after to scale is sued for peace by row；
According to bij=(bi-bj)/[2 (n-1)]+0.5 pair of value obtained by row summation carry out mathematic(al) manipulation, wherein, biRepresent i-th
The value that row is obtained by row summation, bjRepresent the value that jth row is obtained by row summation, bijRepresent the value after mathematic(al) manipulation conversion；
According toI ∈ { 1,2 ..., n } calculate the weighted value of each evaluation status amount, wiRepresent i-th
The weighted value of evaluation status amount, wherein, α ' represents adjusting parameter and α '=(n-1)/2.
5. according to one of Claims 1-4 power transmission cable synthetical condition assessment method, it is characterised in that the transmission of electricity electricity
The cable assembly of cable includes cable body, cable intermediate joint and cable passage；The evaluation status amount of the cable body includes
Oversheath and major insulation, the evaluation status amount of the cable intermediate joint include Joint Temperature and joint partial discharge, the electricity
The evaluation status amount of cable passage includes tunnel gas, tunnel humiture, tunnel cigarette sense and sump.
6. power transmission cable synthetical condition assessment method according to claim 5, it is characterised in that described by confidence level coefficient
The membership function value of each state grade of each described evaluation status amount after amendment weighting, obtains each evaluation status respectively
Each state grade of amount and the process of probabilistic confidence level functional value include：
" the person in servitude of each state grade of each described evaluation status amount after (A)=α m ' (A), m ' (Θ)=1- α amendment weightings according to m
Category degree functional value, obtains each state grade and probabilistic confidence level functional value of each evaluation status amount；
Wherein, α represents confidence level coefficient, and m ' (A) represents the membership function value before amendment, and " (A) represents revised and be subordinate to m
Degree functional value, m ' (Θ) is the brief inference of uncertain evidence, and the brief inference of the uncertain evidence refers to probabilistic confidence
Degree functional value.
7. power transmission cable synthetical condition assessment method according to claim 5, it is characterised in that described according to the transmission of electricity electricity
Each state grade of cable and probabilistic confidence level functional value determine that the process of the comprehensive state of the power transmission cable includes：
The difference of inquiry confidence level functional value and the confidence level functional value of other state grades is more than default first threshold, not true
Qualitatively confidence level functional value is less than default Second Threshold and belief function value is more than probabilistic confidence level functional value
Dbjective state grade, the dbjective state grade is defined as the comprehensive state of the power transmission cable.
8. a kind of power transmission cable synthetical condition assessment system, it is characterised in that including：
Data capture unit, for obtaining the operation ginseng that real-time watch device monitors each cable assembly of power transmission cable to be assessed
The related service data that number is obtained, the related service data includes the monitoring of each evaluation status amount of each cable assembly
Value；
Degree of membership computing unit, each state grade for determining according to the related service data each evaluation status amount
Membership function value；
Weight calculation unit, the weighted value for obtaining each evaluation status amount；
Weighted units, for being entered to the membership function value of each state grade of each evaluation status amount according to the weighted value
Row weighting is processed, the membership function value of each state grade of each described evaluation status amount after being weighted；
Amending unit, for each state grade of each described evaluation status amount after confidence level coefficient corrects weighting respectively
Membership function value, obtains each state grade and probabilistic confidence level functional value of each evaluation status amount；
Integrated unit, for according to default composition rule to each state grade of each evaluation status amount and probabilistic
Confidence level functional value carries out synthesis treatment, obtains each state grade and probabilistic confidence level function of the power transmission cable
Value；
State determination unit, determines for each state grade according to the power transmission cable and probabilistic confidence level functional value
The comprehensive state of the power transmission cable.
9. power transmission cable synthetical condition assessment system according to claim 8, it is characterised in that：
The degree of membership computing unit is normalized to the related service data, obtains normalized result, root
Determine that according to the normalized result and default membership function each state grade of each evaluation status amount is subordinate to
Degree functional value.
10. power transmission cable synthetical condition assessment method according to claim 8, it is characterised in that：
The weight calculation unit constructs fuzzy complementary matrix, and the fuzzy complementary matrix is A=(aij)n×n, wherein, aij+aji
=1, (i, j=1,2 ..., n), n represents the quantity of evaluation status amount, aijRepresent aiCompare ajImportant degree, aiRepresent i-th and comment
Estimate quantity of state, ajRepresent j-th evaluation status amount；Quantity is carried out to the fuzzy complementary matrix by default scaling law
Scale；The fuzzy complementary matrix after to scale is sued for peace by row；According to bij=(bi-bj)/[2 (n-1)]+0.5 pair asked by row
Mathematic(al) manipulation is carried out with the value for obtaining, wherein, biRepresent the value that the i-th row is obtained by row summation, bjRepresent that jth row is sued for peace by row
The value for arriving, bijRepresent the value after mathematic(al) manipulation conversion；According toI ∈ { 1,2 ..., n } are calculated and respectively commented
Estimate the weighted value of quantity of state, wiI-th weighted value of evaluation status amount is represented, wherein, α ' represents adjusting parameter and α '=(n-
1)/2。
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