CN110265906A - A kind of grounding net of transformer substation state evaluating method and computer system - Google Patents
A kind of grounding net of transformer substation state evaluating method and computer system Download PDFInfo
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- CN110265906A CN110265906A CN201910563461.2A CN201910563461A CN110265906A CN 110265906 A CN110265906 A CN 110265906A CN 201910563461 A CN201910563461 A CN 201910563461A CN 110265906 A CN110265906 A CN 110265906A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The present invention relates to a kind of grounding net of transformer substation state evaluating method and computer systems, which comprises according to assessment object acquisition electricity function index and non electric performance index；Construct the weight of electricity function index；Electricity function index and respective weights application enhancements TOPSIS method based on grounded screen carry out entry evaluation to grounded screen state, obtain entry evaluation result；Obtain the score value and non electric performance evaluation result of each non electric performance index；The end-state assessment result of grounded screen is obtained, to instruct staff to carry out grounded screen maintenance.Compared with prior art, the present invention can effectively assess substation grounding net state, provide reference for whether grounded screen needs to excavate maintenance；Simultaneously as having comprehensively considered the influence of electric property and non electric performance to grounded screen degradation, keeps evaluation result more comprehensively accurate, so as to adopt an effective measure in time, improve the operational reliability of electric system.
Description
Technical field
The present invention relates to grounding net of transformer substation technical fields, more particularly, to a kind of substation based on improved TOPSIS method
Grounded screen state evaluating method and computer system.
Background technique
Grounded screen is the important component of substation, is that maintenance system operates normally, ensures operations staff and equipment peace
Full important measures.But grounded screen is embedded in underground, often because construction when failure welding and operation in soil electrochemical action due to draw
Send out corrosion default, gently then grounding grids is made to attenuate, it is heavy then occur grounding grids be broken etc., cause under Grounding performance
Drop, may cause accident, has become significant problem urgently to be resolved in electric system when serious.Currently, electric system is related
Department, which mainly passes through, periodically excavates corrosion and fracture defect that the means such as selective examination determine grounded screen, and there are blindness for this mode
By force, the problems such as low efficiency.Especially when grounded screen is functional, unnecessary human and material resources wave will be will cause by excavating sampling observation
Take.It is necessary to study a kind of effective grounded screen state evaluating methods to assess grounded screen state, facilitates work
The state of the grasp grounded screen of personnel promptly and accurately, while reference can also be provided for the formulation of grounded screen repair and maintenance plan, this
Safe and reliable operation for ensuring grounded screen is significant.
Patent application CN104833898A and CN104678246A propose a kind of using M sequence signal code, one respectively
Grounding net of transformer substation etch state appraisal procedure of the kind based on Transient grounding resistance and response, but both methods is mostly with single
Assessment foundation of the index as grounded screen state, content is not comprehensive enough, and assessment result is vulnerable to interference effect.Patent application
CN107271934A proposes a kind of grounded screen secure state evaluating method based on magnetic effect, but substation's electromagnetic environment is more
Complexity, magnetic field signal is highly prone to interfere, and implementation process is relatively complicated.Patent application CN104897875A proposes substation
Soil is to the corrosive evaluation method of galvanized steel ground grid, but this method scoring process is entirely subjective, assessment result by it is subjective because
Element is affected.Patent application CN107561407A proposes a kind of distributed grounding net of transformer substation testing and evaluation method,
Mainly Inversion Calculation is carried out according to ground grid design drawing to obtain grounded screen characterisitic parameter and carry out earth mesh state assessment, but
Grounded screen soil characteristic is extremely complex and influence factor is more, causes the calculated results and practical knot of grounded screen characterisitic parameter
The accuracy of the deviation of fruit easily impact evaluation result.The prior art be difficult to accurately obtain grounded screen state, staff without
Method carries out reliable repair and maintenance to grounded screen.
Summary of the invention
It is provided a kind of based on improved TOPSIS method it is an object of the invention to overcome the problems of the above-mentioned prior art
Grounding net of transformer substation state evaluating method and computer system.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of grounding net of transformer substation state evaluating method based on improved TOPSIS method, comprising:
Step 1, according to assessment object acquisition electricity function index and non electric performance index；
Step 2, the weight for constructing electricity function index；
The data of the current electricity function index of step 3, acquisition grounded screen, electricity function index and phase based on grounded screen
It answers weight application enhancements TOPSIS method to carry out entry evaluation to grounded screen state, obtains entry evaluation result Rp；
The data of step 4, the current non electric performance index of acquisition grounded screen, obtain point of each non electric performance index
Value forms non electric performance evaluation result V；
Step 5, according to the entry evaluation result RpThe end-state of grounded screen is obtained with non electric performance evaluation result V
Assessment result Rf；
Step 6, according to the end-state assessment result Rf, staff is instructed to carry out grounded screen maintenance.
Further, the electricity function index include the ground resistance of grounded screen, ground potential liter, Maximum Contact current potential and
Maximum stride voltage.
Further, the non electric performance index include grounded screen put into operation the time, soil acidity or alkalinity, soil moisture content,
Soil resistivity and soil redox potential.
Further, in the step 2, subjective weights and Objective Weight are carried out to electricity function index respectively, based on obtaining
The weight of subjective weight and objective weight the building electricity function index obtained:
Wherein, ωiFor the final weight of i-th of electricity function index, WAiFor the subjective power of i-th of electricity function index
Weight, WBiFor the objective weight of i-th of electricity function index, N is the number of electricity function index.
Further, the detailed process of the subjective weights includes:
1a. establishes the evaluations matrix A of N number of electricity function indexN×N, it is
Wherein, the element a in evaluations matrix AijValue range be 1/9~9,1≤i≤N, 1≤j≤N；
1b. calculates the subjective weight of N number of electricity function index according to evaluations matrix A, wherein the subjective power of i-th index
Weight WAiCalculation formula be
Further, the detailed process of the Objective Weight includes:
2a. is based on N number of electricity function index to the evaluations matrix B of M schemeN×M:
2b. is to evaluations matrix BN×MIn element carry out in the same directionization processing, the evaluations matrix B ' changed in the same directionN×M=
{b′ij}N×M, wherein evaluations matrix BN×MIn the i-th row jth column element in the same directionization processing calculation formula are as follows:
2c. in the same directionization matrix assessment matrix B 'N×MNondimensionalization processing is carried out, dimensionless evaluations matrix C ' is obtainedN×M=
{c′ij}N×M, wherein in the same directionization matrix assessment matrix B 'N×MIn the i-th row jth column element nondimensionalization processing calculation formula are as follows:
2d. is based on dimensionless evaluations matrix C 'N×MIt calculates between the standard deviation of N number of electricity function index and different indexs
Cross-correlation coefficient, wherein the standard deviation s of i-th of indexi, j-th index standard deviation sj, i-th index and j-th index
Cross-correlation coefficient ρijCalculation formula are as follows:
In formula:WithRespectively dimensionless evaluations matrix C 'N×MThe mean value of j i-th row and row element；
2e. calculates the information content G of N number of electricity function index, wherein the information content G of i-th of indexiCalculation formula are as follows:
2f. calculates the objective weight of N number of electricity function index, wherein the objective weight W of its i indexBiCalculation formula
For
Further, the detailed process of the step 3 includes:
The optimal collection and most bad collection [p of 4a. acquisition grounded screen state1,p2,…,pN] and [q1,q2,…,qN]；
Data R=[the r of the 4b. calculating current electricity function index of grounded screen1,r2,…,rN] with optimal collection distance d and most
Distance l between excellent collection and most bad collection, calculation formula are as follows:
The entry evaluation result R of 4c. calculating grounded screenp, calculation formula is
Further, the calculating process of the score value of each non electric performance index includes:
5a. establishes the subordinating degree function μ of grounded screen non electric performance index state a, i-th of non electric performance index situation
aiSubordinating degree function μiAre as follows:
In formula: aimaxAnd aiminRespectively the i-th non electric performance index situation aiThe upper bound and lower bound；
5b. calculates the score value v of grounded screen non electric performance index, the calculation formula of i-th of non electric performance index score value
Are as follows:
vi=ki·μi+li
In formula, kiAnd liThe coefficient of correspondence of respectively i-th non electric performance index score value and subordinating degree function.
Further, the end-state assessment result R of the grounded screenfCalculation formula is
The present invention also provides a kind of grounding net of transformer substation status assessment computer system, including memory and processor, institutes
It states and is stored with computer program in memory, the processor calls the computer program to execute as mentioned based on improvement
The step of grounding net of transformer substation state evaluating method of TOPSIS method.
The electricity function index and its subjectiveness and objectiveness weight of composite earthing network of the present invention carry out just the state of grounded screen
Step assessment, the evaluation result for being then based on grounded screen non electric performance obtains the end-state assessment result of grounded screen, to refer to
It leads staff and carries out grounded screen maintenance.Compared with prior art, the invention has the following advantages:
1) present invention comprehensively considers electricity function index and non electric performance index, so that the assessment content of grounded screen is more
Comprehensively, the accuracy of grounded screen status assessment is improved；
2) classical insulation index of the present invention according to grounded screen, the subjective weight and objective weight of comprehensive parameters index
Factor has obtained the final weight of electricity function index, assigns the influence that power process has fully considered master, objective factor, makes to assign
Power process is more reasonable；
3) optimum state optimal collection and state most bad collection of the present invention according to grounded screen electricity function index, in conjunction with grounded screen
Current state and optimal solution relative distance by grounded screen state be divided into good, minor failure, generic failure and it is serious therefore
Hinder four kinds of states, entry evaluation is carried out to operating status with grounded screen parameter current, realizes the quantitative and fixed of grounded screen state
Property analysis；
4) present invention has comprehensively considered the grounded screen state and the docking of non-electrical characteristic index that electrical characteristic index is reflected
The influence of earth mat deterioration, assessment result are more accurate and reliable.
The present invention fully considers that main, objective factor influences, and fusion is main, objective weighted model assigns grounded screen electricity function index
Power, and realized according to grounded screen current state and the relative distance of optimum state to grounded screen state entry evaluation, it is basic herein
On, comprehensively consider influence of the non electric performance index to grounded screen degradation, it is comprehensive and accurate to realize grounded screen state
Assessment.
Detailed description of the invention
Fig. 1 is flow diagram of the invention；
Fig. 2 is the Analytic Hierarchy Process Model schematic diagram that the present invention constructs.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to
Following embodiments.
The electricity function index and non-electrical index and its weight of composite earthing network of the present invention connect using the realization of TOPSIS method
The accurate evaluation of earth mat working condition.Grounding net of transformer substation occurs corrosion and is such as striden electricity when fracture defect to ground connection characterisitic parameter
Pressure, contact voltage, ground resistance etc. can have an impact, and the present invention comprehensively considers grounded screen running environment such as on this basis again
Soil types, pH value, relative humidity and operation time limit etc. can form the effect of earth conductor more comprehensive to grounded screen
Assessment, when find grounded screen security risk it is higher when, formulate maintenance plan in advance, help to improve Operation of Electric Systems stablize
Property.
Status assessment is carried out by subjects of a 35kV grounding net of transformer substation, as shown in Figure 1, judging according to the following steps
The current state of the grounded screen:
Step S1 establishes the Analytic Hierarchy Process Model of grounded screen status assessment, and the Analytic Hierarchy Process Model is by destination layer, project
Layer, indicator layer and solution layer composition, as shown in Fig. 2, wherein destination layer is condition evaluation results；Item layer includes the electricity of grounded screen
Gas performance and non electric performance；Indicator layer is by the ground resistance of grounded screen, ground potential liter, Maximum Contact current potential, maximum stride electricity
The electricity function indexs such as pressure and grounded screen put into operation time, soil acidity or alkalinity, soil moisture content, soil resistivity, Soil oxidation also
The non-electrical index such as former current potential composition, is denoted as R=[r respectively1,r2,…,rN] and T=[t1,t2,…,tL], herein, N and L difference
For the number of grounded screen electricity function index and non-electrical index；Solution layer is made of M scheme, is denoted as scheme 1, scheme
2 ..., scheme M.In the present embodiment, N=4, M=5.
Five schemes in the present embodiment are respectively as follows:
Scheme 1: grounded screen is normal condition, and N number of electricity function index meets GB 50065-2011 grounding design rule
Limit value given by model；
Scheme 2: the power frequency earthing resistance of grounded screen is limit value given by GB 50065-2011 grounding design specification,
Its parameter is identical as scheme 1.
Scheme 3: the power frequency ground potential of grounded screen is upgraded to limit value given by GB 50065-2011 grounding design specification,
Its parameter is identical as scheme 1.
Scheme 4: the Maximum Contact of grounded screen is limit value given by GB 50065-2011 grounding design specification,
Other parameters are identical as scheme 1.
Scheme 5: the maximum stride potential difference of grounded screen is limit value given by GB 50065-2011 grounding design specification,
Other parameters are identical as scheme 1.
Step S2 carries out subjectiveness and objectiveness to the electricity function index of grounded screen and assigns power, determines electricity function index weight.
Detailed process is as follows for subjective weights:
1a. establishes the evaluations matrix A of N number of electricity function indexN×N, it is
Wherein, the element a in evaluations matrix AijThe value range of (1≤i≤N, 1≤j≤N) is 1/9~9；
1b. calculates the subjective weight of N number of electricity function index according to evaluations matrix A, wherein the subjective power of i-th index
Weight WAiCalculation formula be
Detailed process is as follows for Objective Weight:
2a. establishes evaluations matrix B based on M scheme of N number of electricity function index in indicator layer and solution layerN×M, can table
It is shown as
2b. is to evaluations matrix BN×MIn element carry out in the same directionization processing, the evaluations matrix B ' changed in the same directionN×M,
In, evaluations matrix BN×MIn the i-th row jth column element in the same directionization processing calculation formula be
2c. in the same directionization matrix assessment matrix B 'N×MNondimensionalization processing is carried out, dimensionless evaluations matrix C ' is obtainedN×M,
Wherein, in the same directionization matrix assessment matrix B 'N×MIn the i-th row jth column element nondimensionalization processing calculation formula be
2d. is based on dimensionless evaluations matrix C 'N×MIt calculates between the standard deviation of N number of electricity function index and different indexs
Cross-correlation coefficient, wherein the standard deviation s of i-th of indexi, j-th index standard deviation sj, i-th index and j-th index
Cross-correlation coefficient ρijCalculation formula be
In formula:WithRespectively dimensionless evaluations matrix C 'N×MThe mean value of j i-th row and row element；
2e. calculates the information content G of N number of electricity function index, wherein the information content G of i-th of indexiCalculation formula be
2f. calculates the objective weight of N number of electricity function index, wherein the objective weight W of its i indexBiCalculation formula
For
The subjective weight W of comprehensive N number of electricity function indexAWith objective weight WB, calculate the final of N number of electricity function index
Weights omega, wherein the final weight ω of i-th of indexiCalculation formula be
Step S3 establishes the state evaluation collection S=[s of grounded screen1,s2,s3,s4], wherein s1、s2、s3And s4It respectively indicates
Grounded screen is in good condition, there are minor failure, there are generic failure and there are catastrophe failure, corresponding score is respectively 85~
100,70~85,40~70 and 0~40, as shown in table 1.
1 grounded screen state of table corresponds to score value
| Grounded screen state | Well | Minor failure | Generic failure | Catastrophe failure |
| Score value | 85~100 | 70~85 | 40~70 | 0~40 |
Step S4, the electricity function index application enhancements TOPSIS method based on grounded screen tentatively comment grounded screen state
Estimate, power is assigned to each evaluation index while considering subjective weights and objective weighted model, subjective and objective to combine, evaluation more rationally has
Effect specifically uses following process:
4a. remembers the optimal collection of grounded screen state and most bad collection is respectively [p1,p2,…,pN] and [q1,q2,…,qN], wherein
Optimal collection [p1,p2,…,pN] each parameters history data are constituted when being put into operation by grounded screen, most bad collection [q1,q2,…,qN] according to GB
Limit value as defined in 50065-2011 grounding design specification is constituted；
4b. calculates the current electricity function index of grounded screen and state optimization collection distance d and state optimization collection and state most
Distance l between bad collection, the current electricity function index of the grounded screen and state optimization collection distance d and optimal collection with it is most bad
The calculation formula of distance l is between collection
The entry evaluation result R of 4c. calculating grounded screenp, calculation formula is
Step S5 establishes the non electric performance indicator evaluation system of grounded screen, according to L non electric performance index situation with
The corresponding relationship of earth conductor corrosion rate gives a mark to grounded screen state, and marking result is denoted as V=[v1,v2,…,
vL], wherein viI=1,2 ..., L indicates the corresponding score of i-th of non electric performance index of grounded screen.It is described based on non-electrical
The scoring method of gas Performance Evaluating Indexes are as follows:
5a. establishes the subordinating degree function μ of grounded screen non electric performance index state a, and i-th of non electric performance refers to
Mark situation aiSubordinating degree function μiFor
In formula: aimaxAnd aiminRespectively the i-th non electric performance index situation aiThe upper bound and lower bound；
The score value v of 5b. calculating grounded screen non electric performance index, wherein non electric performance index is as shown in table 2, and i-th
The calculation formula of non electric performance index score value is
vi=ki·μi+li
In formula, kiAnd liThe coefficient of correspondence of respectively i-th non electric performance index score value and subordinating degree function.
2 non electric performance index of table
Step S6, the entry evaluation result R according to grounded screenpWith non electric performance evaluation result V to grounded screen state into
Row evaluation, obtains the condition evaluation results R of grounded screenf, the condition evaluation results R of the grounded screenfCalculation formula be
According to the condition evaluation results R of grounded screenfAnd table 1 determines grounded screen state, to instruct staff to be grounded
Net maintenance.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that those skilled in the art without
It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical solution, all should be within the scope of protection determined by the claims.
Claims (10)
1. a kind of grounding net of transformer substation state evaluating method based on improved TOPSIS method characterized by comprising
Step 1, according to assessment object acquisition electricity function index and non electric performance index；
Step 2, the weight for constructing electricity function index；
The data of the current electricity function index of step 3, acquisition grounded screen, electricity function index and corresponding power based on grounded screen
Weight application enhancements TOPSIS method carries out entry evaluation to grounded screen state, obtains entry evaluation result Rp；
The data of step 4, the current non electric performance index of acquisition grounded screen, obtain the score value of each non electric performance index, shape
At non electric performance evaluation result V；
Step 5, according to the entry evaluation result RpThe end-state assessment of grounded screen is obtained with non electric performance evaluation result V
As a result Rf；
Step 6, according to the end-state assessment result Rf, staff is instructed to carry out grounded screen maintenance.
2. the grounding net of transformer substation state evaluating method according to claim 1 based on improved TOPSIS method, feature exist
In the electricity function index includes the ground resistance of grounded screen, ground potential liter, Maximum Contact current potential and maximum stride voltage.
3. the grounding net of transformer substation state evaluating method according to claim 1 based on improved TOPSIS method, feature exist
It include that grounded screen puts into operation time, soil acidity or alkalinity, soil moisture content, soil resistivity and soil in, the non electric performance index
Earth oxidation-reduction potential.
4. the grounding net of transformer substation state evaluating method according to claim 1 based on improved TOPSIS method, feature exist
In, in the step 2, subjective weights and Objective Weight are carried out to electricity function index respectively, subjective weight based on acquisition and
The weight of objective weight building electricity function index:
Wherein, ωiFor the final weight of i-th of electricity function index, WAiFor the subjective weight of i-th of electricity function index, WBi
For the objective weight of i-th of electricity function index, N is the number of electricity function index.
5. the grounding net of transformer substation state evaluating method according to claim 4 based on improved TOPSIS method, feature exist
In the detailed process of the subjective weights includes:
1a. establishes the evaluations matrix A of N number of electricity function indexN×N, it is
Wherein, the element a in evaluations matrix AijValue range be 1/9~9,1≤i≤N, 1≤j≤N；
1b. calculates the subjective weight of N number of electricity function index according to evaluations matrix A, wherein the subjective weight W of i-th indexAi
Calculation formula be
6. the grounding net of transformer substation state evaluating method according to claim 4 based on improved TOPSIS method, feature exist
In the detailed process of the Objective Weight includes:
2a. is based on N number of electricity function index to the evaluations matrix B of M schemeN×M:
2b. is to evaluations matrix BN×MIn element carry out in the same directionization processing, the evaluations matrix B' changed in the same directionN×M={ b 'ij}N×M,
Wherein, evaluations matrix BN×MIn the i-th row jth column element in the same directionization processing calculation formula are as follows:
2c. in the same directionization matrix assessment matrix B 'N×MNondimensionalization processing is carried out, dimensionless evaluations matrix C' is obtainedN×M=
{c′ij}N×M, wherein in the same directionization matrix assessment matrix B 'N×MIn the i-th row jth column element nondimensionalization processing calculation formula are as follows:
2d. is based on dimensionless evaluations matrix C'N×MIt calculates mutual between the standard deviation of N number of electricity function index and different indexs
Relationship number, wherein the standard deviation s of i-th of indexi, j-th index standard deviation sj, i-th of index it is mutual with j-th index
Relationship number ρijCalculation formula are as follows:
In formula:WithRespectively dimensionless evaluations matrix C'N×MThe mean value of j i-th row and row element；
2e. calculates the information content G of N number of electricity function index, wherein the information content G of i-th of indexiCalculation formula are as follows:
2f. calculates the objective weight of N number of electricity function index, wherein the objective weight W of its i indexBiCalculation formula be
7. the grounding net of transformer substation state evaluating method according to claim 1 based on improved TOPSIS method, feature exist
In the detailed process of the step 3 includes:
The optimal collection and most bad collection [p of 4a. acquisition grounded screen state1,p2,…,pN] and [q1,q2,…,qN]；
Data R=[the r of the 4b. calculating current electricity function index of grounded screen1,r2,…,rN] with optimal collection distance d and optimal collection
Distance l between most bad collection, calculation formula are as follows:
The entry evaluation result R of 4c. calculating grounded screenp, calculation formula is
8. the grounding net of transformer substation state evaluating method according to claim 1 based on improved TOPSIS method, feature exist
In the calculating process of the score value of each non electric performance index includes:
5a. establishes the subordinating degree function μ, i-th of non electric performance index situation a of grounded screen non electric performance index state ai's
Subordinating degree function μiAre as follows:
In formula: aimaxAnd aiminRespectively the i-th non electric performance index situation aiThe upper bound and lower bound；
5b. calculates the score value v of grounded screen non electric performance index, the calculation formula of i-th of non electric performance index score value are as follows:
vi=ki·μi+li
In formula, kiAnd liThe coefficient of correspondence of respectively i-th non electric performance index score value and subordinating degree function.
9. the grounding net of transformer substation state evaluating method according to claim 1 based on improved TOPSIS method, feature exist
In the end-state assessment result R of the grounded screenfCalculation formula is
10. a kind of grounding net of transformer substation status assessment computer system, including memory and processor, which is characterized in that described
Computer program is stored in memory, the processor calls the computer program to execute such as any institute of claim 1-9
The step of grounding net of transformer substation state evaluating method based on improved TOPSIS method stated.
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| CN111563682A (en) * | 2020-05-07 | 2020-08-21 | 贵州电网有限责任公司 | Test evaluation method for distribution automation equipment |
| CN111651717A (en) * | 2020-04-22 | 2020-09-11 | 无锡商业职业技术学院 | Cable state evaluation method based on CRITIC method |
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