CN107633354A - A kind of integrated evaluating method stood with straight-flow system running status health degree - Google Patents
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Abstract
A kind of integrated evaluating method the invention discloses station with straight-flow system running status health degree, its step are：A, the assessment indicator system for considering the factors such as straight-flow system equipment health, operational defect, service life, voltage x current running status is established；B, each desired value is obtained by counting to calculate, and be standardized and normalized；C, subjective and objective weight is calculated based on improved AHP method and standard deviation, average difference algorithm；D obtains two quantitative evaluation results of straight-flow system running status health degree to be assessed by weigthed sums approach.Evaluation procedure has not only taken into account the subjective and objective property of evaluation, and embodies the significance level that different evaluation index influences on evaluation result.Evaluation result more tends to be reasonable, the health degree change procedure of more microcosmic meticulously distinguishing system running status, and the Appreciation gist quantified is provided for the Optimal Decision-making of the Maintenance and Repair plan of straight-flow system.
Description
Technical field
The present invention relates to the running status quantitative evaluation field of power system transformer substation station power source system, specially one
The various visual angles integrated evaluating method of kind station straight-flow system running status, suitable for being carried out to straight-flow system actual motion state
Evaluated based on subjective and objective refinement, can be the optimization of further straight-flow system operation risk assessment and maintenance plan
Decision-making provides foundation.
Background technology
Substation Station is station communication and various protection, automation equipment electrical source of power and behaviour with power of alterating and direct current system
Make the supplier of control power supply, be the premise of substation IED normal operation, be to ensure substation safety, reliability service
An important step.Power of alterating and direct current system is different according to its part, divide into different power modules, each power supply
The main supply object of module and the function of being played are also different.During normal operation, AC power supply system is responsible for illuminating
The exchange power device such as system, ventilation equipment, monitoring device, measuring equipment provides stable AC power, and DC power system is then
It is responsible for the load of the automatic equipments such as power transformation station center control, protection and breaker and galvanic current source, communication power supply system is provided
Communication power supply is provided for transformer station's intercommunication load.When AC power supply system breaks down, if failure can be female by being segmented
Line regulation and control are excluded, then can continue to ensure the continued power of station alternating current-direct current load.When a wide range of power outage occurs,
Then need to enable the stand-by power supplies such as battery to provide safeguard DC energy source of the station with important DC load normal operation, and pass through
Inversion unit provides reliable source of power to the important AC load such as monitoring, metering, emergency lighting.Further, since the guarantor of transformer station
Shield, automatics and its control loop, signal circuit are required for power of alterating and direct current reliablely and stablely to work, therefore hand over straight
The failure of stream power supply is also possible to cause can not acting for relay protection and automatic safety device, and then in system jam
Cause the tripping operation of bypassing the immediate leadership of protection device, expand accident scope.The June in 2016 of Xi'an City, Shanxi Province on the 18th southern suburbs becomes fire incident
Precisely due to the problem of power of alterating and direct current system, causes.DC power system is set as important foundations such as transformer station, communication base stations
The basis of safe operation is applied, ensures that safe operation of its stable operation to transformer station plays vital effect.In power train
In system operation, the power equipment caused by dc source design is unreasonable, lectotype selection is incorrect, operation maintenance is lack of standardization
Damage, the system failure, accident scope expand, or cause direct current because that can not prevent transforming plant DC power supply operation risk in advance
Power failure, power supply reliability is reduced, all will bring potential massive losses to electric power system and national wealth.Therefore carry out
Transforming plant DC power supply health state evaluation and corresponding anti-accident prevention control measure are that preferentially to solve the problems, such as, and are ground
Study carefully the various visual angles overall merit towards straight-flow system running status reliability and security, can be not only dynamic evaluation direct current system
Potential operation risk of uniting provides the refinement method of science, and corresponding prediction policy is established in assessment and measure can pole
The operational reliability of big enhancing station power source system.
Transformer station direct current system is made up of the DC distributor comprising charging device and DC feedback system, batteries.
It is domestic at present to assess the corresponding evaluation method that established, such as Guangdong electricity with the running status of straight-flow system around station
Net company is in equipment state evaluation with specify that state of the DC power supply device based on deduction of points statistics in risk assessment technology directive/guide
Evaluation and methods of risk assessment, Planning and construction standards and prevention operation risk to unified station DC power system have one
Fixed directive function.But the appraisal procedure influences important on the different degrees of equipment operational defect of straight-flow system on assessment result
Property degree lack consider, so as to cause assessment result overly conservative, and evaluation method is to the real time execution of DC power system
State also lacks consideration.Therefore, with reference to the development demand of intelligent substation, the present invention is directed to above-mentioned deficiency, and invention proposes
The evaluation method of a set of station DC power system for considering multifactor impact, for improving intelligent substation station electricity consumption
The operational reliability in source, the appraisal procedure for improving station power supply running status are significant.
The content of the invention
Fast development according to current Substation Station with dc source technology, the present invention, which proposes, a set of considers station
It is real with the device configuration and operational defect of straight-flow system switchboard and batteries, the equipment operation time limit and DC voltage and current
When the multifactor impact such as running status running status health degree evaluation method.It is by establishing a set of comprehensive evaluation index
System, with reference to station to be assessed DC power system object, utilize the operating statistic data of station straight-flow system, online survey
Data are measured, the calculation and analysis methods based on determined different evaluation index carry out indices calculating and standardization, simultaneous
On the basis of customer's objective weight is to the influence of evaluation result, intuitively comparative evaluation's result is obtained, is Substation Station direct current
The assessment of the running status health degree of system and the prevention of operation risk provide quantitatively evaluating foundation.The integrated evaluating method
Using simple, conclusion ocular and clear, there is good application value.
A kind of integrated evaluating method stood with straight-flow system running status health degree, it is characterised in that based on foundation
One assessment indicator system, including：
Whether evaluation index one, equipment health indicator EHI, including station straight-flow system device configuration meet：
(1) double set configuration charging devices；(2) double set configuration batteries；(3) filling based on high-frequency switching technology is used
Electric module；(4) N+1 pattern configurations charging modules are pressed；(5) the effective decompression regulator of configuration；(6) the specified appearance of batteries
Whether amount meets that accident electric discharge requires；(7) whether feeder switch capacity meets power reguirements；(8) direct current is spaced apart is with fuse
It is no to meet differential requirement；(9) whether straight-flow system main electrical scheme meets demand of technical standard；(10) there is direct current cabinet anti-failure to arrange
Apply；(11) batteries have anti-failure measure.
Whether evaluation index two, operation health indicator OHI, including station straight-flow system meet following urgent operation defects：
(1) dc bus decompression；(2) dc bus is grounded entirely；(3) batteries are caught fire or exploded；(4) batteries
Short circuit；(5) batteries are opened a way；(6) batteries outlet fuse blows；(7) charging device outlet dc switch tripping operation；
(8) two sections of AC interruptions of charging device；(9) charging device failure or single set charging device 2 and the event of above charging module
Barrier；(10) silicon reduction voltage loop is opened a way；(11) dc switch tripping operation causes important protection or control loop dead electricity；(12) direct current is presented
Line branch road dead ground.
And whether station straight-flow system meets following great operational defect：
(1) dc bus mistake/under-voltage；(2) direct current interruption is grounded but wouldn't influence system normal operation；(3) battery holds
Amount drops to below 80% rated capacity or is unsatisfactory for switching divide-shut brake requirement；(4) the swollen tripe of battery, shell are damaged；(5) store
Battery cell mistake/under-voltage or floating current is unsatisfactory for requiring；(6) battery generates heat, and case temperature is exceeded；(7) charging device one
Road AC interruptions；(8) charging device voltage stabilizing, current stabilization are unsatisfactory for requiring；(9) silicon reduction voltage loop automatically adjusts exception；(10)
The manual dysregulation of silicon reduction voltage loop；(11) insignificant DC load dc switch tripping operation；(12) there is looped network in straight-flow system；
(13) DC feeder grounding alerts；(14) feeder switch is spaced apart using exchange.
And whether station straight-flow system meets following general operational defect：(1) in battery room auxiliary equipment failure or
Damage；(2) batteries in flakes, pole corrosion, oxidation phenomenon be present；(3) battery sepage；(4) single charging module event
Barrier；(5) dc circuit breaker auxiliary contact are bad.
Evaluation index three, service life index, including made by charging device service life index RYI_CH and batteries
With time limit index RYI_BAT；
Evaluation index four, straight-flow system static security index, including node voltage breadth coefficient UDCDI and feeder line branch road
Current distribution factor IDCDI；
The integrated evaluating method specifically includes：
Step 1, the assessment indicator system based on foundation carries out the calculating of station straight-flow system evaluation index；
Step 2, it is standardized for the evaluation index result of calculation that step 1 is calculated：For to be evaluated straight
Streaming system j index i, standardized method needle set index weigh type and carry out selective processing：
Selection processing one：When index is direct index, i.e. index result is the bigger the better, and its standardization formula is:
In formula one, xijRepresent index result of calculation；Respectively index i { xij, j=1,2 ... n } in
Maximum and minimum value.
Selection processing two：When index is inverse indicators, i.e. achievement data is the smaller the better, and its standardization formula is：
Selection processing three：When index is appropriateness index, i.e. achievement data is closerBetter, its standardization formula is：
In formulaFor index i best stabilized value.
Step 3, the standardization evaluation index obtained for step 2 carries out the subjective weights based on advanced AHP, with
And the Objective Weight based on standard deviation and mean difference；
Step 4, the subjective weights and Objective Weight result obtained based on step 3, Weighted Adding is used based on combination weighting
Method carries out overall merit, specifically defines and has obtained subjective weight vectors W1=[w11w12…w1m] and objective weight vector W2=
[w21w22…w2m], then linear combination weight is
W=k1W1+k2W2(k1+k2=1, k1≥0,k2>=0), k1And k2Can be respectively according to the significance level of subjective and objective weight
It is configured, k1And k2Represent that subjective and objective weight has identical importance equal to 0.5.Treated using plus weighting evaluating model
Evaluation station is with the comprehensive evaluation value of straight-flow system running status health degreeWherein, j is represented
Straight-flow system quantity to be evaluated, i represent evaluation index quantity.
In a kind of integrated evaluating method of above-mentioned station straight-flow system running status health degree, the step 1, respectively
The computational methods of evaluation index are specially：
Index one：Equipment health indicator ED computational methods are as shown in formula one.
In formula four, eiFor the value of i-th of statistical items in 11 equipment health indicator statistical items, ei=1 represents i-th of statistics
Item meets operation index requirement, ei=0 foot with thumb down.
Index two：Health indicator OHI computational methods are run as shown in formula five.
In formula five, nOHITo run the statistics number of health assessment indicators；eOHI,iTo run the ith of health indicator statistics
Value, its computational methods refers to formula six.
In formula six, ni、njAnd nkRepresent that straight-flow system runs the statistics of urgent defect, significant deficiency and general defect respectively
Item number；eiRepresent that i-th of urgent operation defect whether there is, ei=1 represents exist, ei=0 represents to be not present；ejRepresent jth
Individual great operational defect whether there is, ej=1 represents exist, ei=0 expression is not present；ekRepresent that k-th of general operation lacks
Fall into and whether there is, ek=1 represents exist, ek=0 expression is not present.Parameter kOHI,1、kOHI,2、kOHI,3For weight coefficient.
Index three：The computational methods of service life index are as shown in formula seven.
In formula seven, the entirety of charging device or battery that T represents puts into operation the time limit, does not consider the maintenance note of each equipment
Record time, unit year；TyeRepresent the design life of charging device or battery, unit year；T1And T2Respectively use year
Two comparison threshold values of limit；Parameter kRYI,1、kRYI,2For service life coefficient of depreciation.
Index four：Static security index includes
Node voltage breadth coefficient UDCDI computational methods are as shown in formula eight.
In formula eight, nUDCDIFor the statistics number of node voltage breadth coefficient；eUDCDI,iFor node voltage breadth coefficient index
Ith statistical value, its computational methods refers to formula nine.
In formula nine, m represents to investigate node total number；udc,lRepresent the actual motion value of l-th of node voltage investigated；ul,e
Represent the specified runtime value of l-th of node voltage investigated.Pl% represents proportionality coefficient；ηu,lPenalty factor is represented, using formula
Zonal cooling penalty shown in ten carries out the amendment of the node voltage offrating order of severity.
The breadth coefficient IDCDI of feeder line branch current computational methods are as shown in formula 11.
In formula 11, nIDCDIFor the statistics number of feeder line branch current breadth coefficient；eIDCDI,iFor feeder line branch current point
The ith statistical value of cloth coefficient index, its computational methods are formula 12.
In formula 12, q represents to investigate node total number；idc,rRepresent the actual motion value of r-th of branch current investigated；
ir,eRepresent the maximum allowable runtime value of r-th of branch current investigated.ηi,rPenalty factor is represented, using formula 13 Suo Shi points
Duan Lianxu penalties carry out the amendment of branch current stability margin.
In formula 13, Pr% represents the proportion threshold value of setting.
It is based on changing in a kind of integrated evaluating method of above-mentioned station straight-flow system running status health degree, step 3
The specific method for entering AHP subjective weights is：Judgment matrix A=(a are established by comparing two-by-two for evaluation indexij)m×m, lead to
Cross the eigenvalue of maximum λ for solving judgment matrix Amax, checked using formula 14 and determine each index relative importance sequence
Uniformity.
M is the number of matrix maximum order, i.e. evaluation index in formula；δCRFor random Consistency Ratio；δRIFor m rank matrixes
Random index, the desired value with order of matrix number increase and increase；Work as δCR<When 0.1, it is believed that the single index of level
Between the ranking results of relative importance there is preferable uniformity.On the premise of consistency check is met, judgement square is obtained
Battle array eigenvalue of maximum λmaxCorresponding characteristic vector, is normalized, that is, draws the subjective power between each index of same layer time
Weight vector.
Based on mark in a kind of integrated evaluating method of above-mentioned station straight-flow system running status health degree, step 3
Quasi- difference and the specific method of the Objective Weight of mean difference are：Standard deviation and average difference method are not consider weighting system by calculating
The standard deviation of index during number W, mean difference obtain objective weight.Weighing vector W selection should make total mark of all evaluation indexes
Quasi- difference and (or) overall average difference is maximum, i.e.,：
In formula 15, F (W) is fitness function；Parameter alpha and β are weight coefficient, meet alpha+beta=1 and α >=0, β >=0, α
=0 represents only to consider mean difference without considering standard deviation, and β=0 represents only to consider standard deviation without considering mean difference, and α and β are equal
Do not represent to take into account standard deviation and mean difference simultaneously for 0；M represents evaluation index quantity；N represents station straight-flow system number to be evaluated
Amount；σiAnd μiWhen representing not considering weight coefficient W respectively, evaluation index i standard deviation and and mean difference；WiRepresent that index i is examined
Consider the objective weight of standard deviation and mean difference.To 15 optimization problems, can obtain：14 optimal problems.
Perseverance can prove in theoryFor object function F (W) unique maximum point.Due to passing
The weighing vector of system is typically all to meet normalization constraints rather than unitization constraints, therefore, obtain it is unitization
Weighing vectorAfterwards, in addition it is also necessary to rightIt is normalized, i.e.,:
The present invention compared with prior art, has advantages below and effect：It is good for carrying out station with straight-flow system running status
During health degree evaluation, considered guarantee straight-flow system switchboard and batteries equipment safe operation key measures,
The many factors such as system operation existing defects and service life, system voltage and electric current actual motion state, are established a set of comprehensive
Appraisement system is closed, can more comprehensively reflect the actual motion state of system.Evaluation procedure is based on subjective and objective entitled group using index
Weight is closed, has not only taken into account the subjective and objective property of overall merit, and embody the weight that different evaluation index influences on evaluation result
Want degree.Evaluation result more tends to be reasonable, and the health degree of more microcosmic meticulously distinguishing system running status changed
Journey, the Appreciation gist quantified is provided for the Optimal Decision-making of the Maintenance and Repair plan of straight-flow system.This method is by engineering evaluation problem
Theorize, analysis result is more directly perceived more convincing.
Brief description of the drawings
Fig. 1 is the method structure chart of station straight-flow system running status health degree overall merit.
Fig. 2 is the index system of station straight-flow system running status health degree evaluation.
Embodiment
Specific embodiment party of the proposed station with straight-flow system running status health degree integrated evaluating method is described below
Formula, and analysis calculating is carried out with reference to instantiation,
First, the Method And Principle of the present invention is introduced first.
Stand with the particular content and step of the index of straight-flow system running status health degree overall merit and method such as
Under：
1st, the establishment of assessment indicator system
Stand and mainly considered to straight-flow system device configuration reasonability with the evaluation of straight-flow system running status health degree, gone through
History operational defect counts, if has anti-failure measure, the system core equipment operation time limit, DC voltage and the static fortune of electric current
The factors such as row safety are assessed.Therefore following System of Comprehensive Evaluation is established around above-mentioned several aspects：
A, equipment health indicator EHI
Investigate whether station straight-flow system device configuration meets following requirements：(1) double set configuration charging devices；(2) double sets
Configure batteries；(3) charging module based on high-frequency switching technology is used；(4) N+1 pattern configurations charging modules are pressed；(5)
The effective decompression regulator of configuration；(6) whether batteries rated capacity meets that accident electric discharge requires；(7) feeder switch holds
Whether amount meets power reguirements；(8) direct current is spaced apart with whether fuse meets differential requirement；(9) whether straight-flow system main electrical scheme
Meet demand of technical standard；(10) direct current cabinet has anti-failure measure；(11) batteries have anti-failure measure.
B, health indicator OHI is run
Investigate whether station straight-flow system meets following urgent operation defects：(1) dc bus decompression；(2) dc bus
Full ground connection；(3) batteries are caught fire or exploded；(4) batteries short circuit；(5) batteries are opened a way；(6) batteries export
Fuse blows；(7) charging device outlet dc switch tripping operation；(8) two sections of AC interruptions of charging device；(9) charging dress
Put failure or single set charging device 2 and above charging module failure；(10) silicon reduction voltage loop is opened a way；(11) dc switch is jumped
Lock causes important protection or control loop dead electricity；(12) DC feeder branch road dead ground.
Investigate whether station straight-flow system meets following great operational defect：(1) dc bus mistake/under-voltage；(2) direct current
Interruption is grounded but wouldn't influence system normal operation；(3) accumulator capacity drops to below 80% rated capacity or is unsatisfactory for out
Close divide-shut brake requirement；(4) the swollen tripe of battery, shell are damaged；(5) single battery mistake/under-voltage or floating current is unsatisfactory for wanting
Ask；(6) battery generates heat, and case temperature is exceeded；(7) charging device AC interruptions all the way；(8) charging device voltage stabilizing, steady
Stream is unsatisfactory for requiring；(9) silicon reduction voltage loop automatically adjusts exception；(10) the manual dysregulation of silicon reduction voltage loop；(11) it is insignificant
DC load dc switch trips；(12) there is looped network in straight-flow system；(13) DC feeder grounding alerts；(14) feeder line
Switch is spaced apart using exchange.
Investigate whether station straight-flow system meets following general operational defect：(1) in battery room auxiliary equipment failure or
Damage；(2) batteries in flakes, pole corrosion, oxidation phenomenon be present；(3) battery sepage；(4) single charging module event
Barrier；(5) dc circuit breaker auxiliary contact are bad.
C, service life index
It is made up of charging device service life index RYI_CH and batteries service life index RYI_BAT.D, direct current
Static system safety index
It is made up of the current distribution factor IDCDI of node voltage breadth coefficient UDCDI and feeder line branch road.
2nd, the calculating of evaluation index
Equipment health indicator ED computational methods are as shown in formula one.
In formula one, eiFor the value of i-th of statistical items in 11 equipment health indicator statistical items, ei=1 represents i-th of statistics
Item meets operation index requirement, ei=0 foot with thumb down.
Health indicator OHI computational methods are run as shown in formula two.
In formula two, nOHITo run the statistics number of health assessment indicators；eOHI,iTo run the ith of health indicator statistics
Value, its computational methods refers to formula three.
In formula three, ni、njAnd nkRepresent that straight-flow system runs the statistics of urgent defect, significant deficiency and general defect respectively
Item number；eiRepresent that i-th of urgent operation defect whether there is, ei=1 represents exist, ei=0 represents to be not present；ejRepresent jth
Individual great operational defect whether there is, ej=1 represents exist, ei=0 expression is not present；ekRepresent that k-th of general operation lacks
Fall into and whether there is, ek=1 represents exist, ek=0 expression is not present.Parameter kOHI,1、kOHI,2、kOHI,3For weight coefficient, can join
Guangdong Power Grid Corporation's equipment state evaluation is examined to set respectively with risk assessment technology directive/guide
The computational methods of service life index are as shown in formula four.
In formula four, the entirety of charging device or battery that T represents puts into operation the time limit, does not consider the maintenance note of each equipment
Record time, unit year；TyeRepresent the design life of charging device or battery, unit year；T1And T2Respectively use year
Two comparison threshold values of limit, refer to Guangdong Power Grid Corporation's equipment state evaluation and set with risk assessment technology directive/guide progress parameter
Put, T is set1And T2Respectively 7 years and 10 years；Parameter kRYI,1、 kRYI,2For service life this with regard to coefficient, refer to Guangdong Power Grid
Corporate device state evaluation carries out parameter setting with risk assessment technology directive/guide, sets
Node voltage breadth coefficient UDCDI computational methods are as shown in formula five.
In formula five, nUDCDIFor the statistics number of node voltage breadth coefficient；eUDCDI,iFor node voltage breadth coefficient index
Ith statistical value, its computational methods refers to formula six.
In formula six, m represents to investigate node total number；udc,lRepresent the actual motion value of l-th of node voltage investigated；ul,e
Represent the specified runtime value of l-th of node voltage investigated.Pl% represents proportionality coefficient；ηu,lPenalty factor is represented, using formula
Zonal cooling penalty shown in seven carries out the amendment of the node voltage offrating order of severity.
The breadth coefficient IDCDI of feeder line branch current computational methods are as shown in formula eight.
In formula eight, nIDCDIFor the statistics number of feeder line branch current breadth coefficient；eIDCDI,iIt is distributed for feeder line branch current
The ith statistical value of coefficient index, its computational methods refer to formula nine.
In formula nine, q represents to investigate node total number；idc,rRepresent the actual motion value of r-th of branch current investigated；ir,e
Represent the maximum allowable runtime value of r-th of branch current investigated.ηi,rPenalty factor is represented, using zonal cooling shown in formula ten
Penalty carries out the amendment of branch current stability margin.
In formula ten, Pr% represents the proportion threshold value of setting.
3rd, the standardization of evaluation index result of calculation
In assessment indicator system, due to existing not in content, dimension and value quality standard etc. between each index
Together, it is therefore desirable to be standardized each index result of calculation.
For straight-flow system j to be evaluated index i, standardized method can be carried out using following three kinds of modes.
When index is direct index, i.e. index result is the bigger the better, and its standardization formula is:
In formula 11, xijRepresent index result of calculation；Respectively index i { xij, j=1,2 ... n } in
Maximum and minimum value.
When index is inverse indicators, i.e. achievement data is the smaller the better, and its standardization formula is：
When index is appropriateness index, i.e. achievement data is closerBetter, its standardization formula is：
In formulaFor index i best stabilized value.
4th, subjective weights of the evaluation index based on advanced AHP
Improved AHP method is a kind of new extended counter scaling law, can avoid traditional analytic hierarchy process (AHP) due to adopting
With the scale of corresponding 9 opinion ratings, the problem of evaluation conclusion mistake or consistency check mistake may be caused.This method is first
It first will determine that grade is divided into 6 grades, if for example, comparison scales of the known E to F and F to G, comparisons of the E to G, which has, transmits
Property, i.e. E:G=(E:F)/(F:G), if somewhat important scoring is λ, important scoring is λ2, hence it is evident that important scoring is λ4,
Strong important scoring is λ6, extremely important scoring is λ8, because the limit of digital judgement is 9, make λ8=9 (λ8More than
Value is all designated as that 9), λ=1.3161. can be obtained it is possible thereby to provide index scale as shown in table 1.
The evaluation index proportion quotiety and implication of the advanced AHP method of table 1
| Scale | Scale implication | Scale | Scale implication |
| 1 | E and F are of equal importance | 3 | E is more obvious than F important |
| 1.3161 | E is somewhat more important than F | 5.1966 | E is stronger than F important |
| 1.7321 | E is more important than F | 9 | E is more extremely important than F |
According to table 1, judgment matrix A=(a are established by comparing two-by-two for evaluation indexij)m×m, judge square by solving
Battle array A eigenvalue of maximum λmax, the uniformity for determining each index relative importance sequence is checked using formula 14.
M is the number of matrix maximum order, i.e. evaluation index in formula；δCRFor random Consistency Ratio；δRIFor m rank matrixes
Random index, changing desired value increases and increases with order of matrix number, and value can be found in table 2.
The uniformity judgment value of table 2
| Exponent number m | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| δRIValue | 0 | 0 | 0.58 | 0.9 | 1.12 | 1.24 | 1.32 | 1.41 | 1.45 | 1.49 |
Work as δCR<When 0.1, it is believed that the ranking results of relative importance have preferable uniformity between the single index of level.
On the premise of consistency check is met, judgment matrix eigenvalue of maximum λ is obtainedmaxCorresponding characteristic vector, is normalized
Processing, that is, draw the subjective weight vectors between each index of same layer time.
5th, Objective Weight of the evaluation index based on standard deviation and mean difference
Standard deviation and average difference method are not consider that the standard deviation of index during weight coefficient W, mean difference obtain by calculating
Obtain objective weight.Weighing vector W selection should make total standard deviation and (or) the overall average difference of all evaluation indexes maximum, i.e.,：
In formula 15, F (W) is fitness function；Parameter alpha and β are weight coefficient, meet alpha+beta=1 and α >=0, β >=0, α
=0 represents only to consider mean difference without considering standard deviation, and β=0 represents only to consider standard deviation without considering mean difference, and α and β are equal
Do not represent to take into account standard deviation and mean difference simultaneously for 0；M represents evaluation index quantity；N represents station straight-flow system number to be evaluated
Amount；σiAnd μiWhen representing not considering weight coefficient W respectively, evaluation index i standard deviation and and mean difference；WiRepresent that index i is examined
Consider the objective weight of standard deviation and mean difference.To 15 optimization problems, can obtain：14 optimal problems.
Perseverance can prove in theoryFor object function F (W) unique maximum point.Due to passing
The weighing vector of system is typically all to meet normalization constraints rather than unitization constraints, therefore, obtain it is unitization
Weighing vectorAfterwards, in addition it is also necessary to rightIt is normalized, i.e.,:
6th, overall merit is carried out using weighting method based on combination weighting
If subjective weight vectors W is obtained1=[w11w12…w1m] and objective weight vector W2=[w21w22…w2m],
Then linear combination weight is W=k1W1+k2W2(k1+k2=1, k1≥0,k2>=0), k1And k2Can basis respectively
The significance level of subjective and objective weight is configured, k1And k2Represent that subjective and objective weight has identical importance equal to 0.5.
It is with the comprehensive evaluation value of straight-flow system running status health degree to station to be evaluated using plus weighting evaluating modelWherein, j represents straight-flow system quantity to be evaluated, and i represents evaluation index quantity.
2nd, the explanation of instantiation is carried out with reference to the above method, its step is as follows：
The first step：The establishment of index system
As shown in Figure 2, index system is divided into two levels, the first level be equipment health indicator, operation health indicator,
Service life index, straight-flow system static security index；Second layer equipment health indicator includes whether double set configuration charging dresses
Put, whether it is double set configuration batteries, whether using the charging module based on high-frequency switching technology, whether N+1 pattern configurations are filled
Whether whether effective, batteries rated capacity meets that accident electric discharge requires, feeder switch holds for electric module, decompression regulator
Whether amount meets that power reguirements, direct current are spaced apart and whether meets whether differential requirement, straight-flow system main electrical scheme meet skill with fuse
Whether art code requirement, direct current cabinet perform related anti-failure measure, whether battery performs related anti-failure measure.Operation is strong
Kang Zhibiao is included whether to have dc bus decompression, dc bus is grounded entirely, batteries are caught fire or explode, batteries it is short
Road, batteries open circuit, batteries outlet fuse blows, charging device outlet dc switch tripping operation, two sections of charging device
AC interruptions, charging device failure or single set charging device 2 and above charging module failure, silicon reduction voltage loop are opened
Road, dc switch tripping operation cause important protection or control loop dead electricity, the dead ground of DC feeder branch road, batteries operation
The urgent defect such as defect；With the presence or absence of dc bus mistake/under-voltage, direct current interruption ground connection but system normal operation, storage wouldn't be influenceed
Battery capacity drops to below 80% rated capacity or is unsatisfactory for switching divide-shut brake requirement, battery is swollen, and tripe or shell are damaged, stores
Battery cell mistake/under-voltage or floating current is unsatisfactory for requirement, battery generates heat or case temperature is exceeded, charging device is handed over all the way
Stream power interruptions, charging device voltage stabilizing, current stabilization be unsatisfactory for requiring, run health indicator, the manual dysregulation of silicon reduction voltage loop,
There is looped network in insignificant DC load dc switch tripping operation, straight-flow system, DC feeder grounding alerts, feeder switch makes
The great operational defect such as it is spaced apart with exchange；With the presence or absence of auxiliary equipment failure in battery room or damage, batteries in flakes and
Pole presence corrosion or oxidative phenomena, battery sepage, single charging module failure, dc circuit breaker auxiliary contact evil idea etc. one
As operational defect.Service life index includes charging device service life index and batteries service life index.Direct current system
Static security index of uniting includes the current distribution factor of node voltage breadth coefficient and feeder line branch road.
Second step：Instance analysis
Straight-flow system state is used with reference to this station exemplified by the test result of four transformer station's related fields, is examined
Various visual angles integrated evaluating method.
By the way that four transformer stations are carried out with the test of aforementioned four index, i.e. equipment health indicator EHI, operation health refers to
OHI is marked, four aspects of service life index and straight-flow system static security index carry out the knot that related detection obtains with statistics
Fruit is as shown in table 3：
The transformer station's Indexs measure statistical conditions of table 3
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology belonging to the present invention
The technical staff in field can make various modifications or supplement to described specific embodiment or using similar mode
Substitute, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
3rd step：Consider the calculating of the comprehensive weight of subjective and objective weight.The present invention will be used obtained by main, objective weighted model
The weight of each evaluation index the thought of final weight is formed by the method for combination, be allowed to objectively react each
The significance level of index, the subjective wishes of policymaker has been reacted again.Subjective weight uses improved AHP method, objective weight
Using standard deviation and average difference method, and integrated by weigthed sums approach.1) subjective weight calculation
Sorted according to significance level, determine the significance level between each evaluation index shown in table 4.
The subjective weight sequencing table of table 4
Subjective weight judgment matrix can be obtained according to table 4Solve square
Battle array A eigenvalue of maximum, obtains λmax=4.0094.Substitute into：Meet δCR<0.1, i.e.,
The ranking results of relative importance have preferable uniformity between single index.Further to service life index and distribution
The two-level index of coefficient index carries out the subjective weight based on advanced AHP and determined.Determine table 5 and the subjective weight row shown in table 6
Sequence table.
Table 5 service life sub-indicator weight sequencing table
The breadth coefficient sub-indicator weight sequencing table of table 6
According to table 5 and table 6, judgment matrix A can be obtained1And A2Respectively： Dematrix A respectively1And A2Eigenvalue of maximum, obtain λmax_A1=λmax_A2=2, meet uniformity
Examine.λ is solved respectivelymax、λmax_A1And λmax_A2Character pair vector, [0.3864 0.7187 0.2747 0.5086],
[0.6050 0.7962], [0.5 0.866], [0.2046 0.3806 0.1455 0.2693], [0.4318 are obtained after normalization
0.5682]、[0.366 0.634].And then it can determine that the subjective weight of each evaluation index is as follows.
7 subjective weights of table
2) objective weight based on standard deviation and mean difference
Carry out the calculating of evaluation index：
The transformer station's index scores of table 8
According to above-mentioned evaluation index, it is specified that being scored at direct index, it is the bigger the better, first carries out dimensionless standardization and obtain
Arrive:
The standard deviation of each index, mean difference and average value when can not be considered weight coefficient by above-mentioned matrix.
Standard deviation sigmai=[0.0433 0.3644 0.3596 0.3596 0.2269 0.2481]
Mean difference μi=[0.0375 0.3156 0.3595 0.3595 0.1963 0.2144]
Average value zi=[0.97500.7896 0.6322 0.6322 0.8572 0.8412]
According toTake respectively α=
0.5, β=0.5, it can obtain
Weighing vector
Normalization can obtain
Normalize result
The objective weight result of table 9
3) comprehensive weight
The objective weight that the subjective weight that improved AHP method is obtained obtains with standard deviation and mean difference method passes through line
Property weighting method is weighted, and weighted factor takes 0.5, obtains comprehensive weight, as a result as follows.
The comprehensive weight result of calculation of table 10
5th step：System evaluation marking and evaluation are carried out according to weight
Once result is calculated to obtain according to comprehensive weight and each index scoring event of transformer station
Table 9 is based on this evaluating method Xia Ge transformer stations total score situation
The scoring event that Liao Ge transformer stations are obtained according to weight is as shown in table 9, it is seen that No. 1 transformer station is scored at
0.9725, very close to 1, illustrate various visual angles overall merit of No. 1 transformer station based on station straight-flow system running status health degree
Score is very high, illustrates that its straight-flow system running status is good.The score of transformer station 3,4 is respectively 0.7587 and 0.8244, explanation
Its straight-flow system running status is substantially normal, but the problem of needing to check occur in some non-key parts.Transformer station 2
It is divided into 0.4977, illustrates that the running status of its straight-flow system merits attention, is the key of the station straight-flow system as shown in Table 9
Caused by the Shortcomings of part, it is therefore desirable to carry out system maintenance maintenance in time.
Above-mentioned evaluation result shows, invents station straight-flow system running status health degree integrated evaluating method not only
The running status of different substation straight-flow system can be effectively contrasted, and the assessment indicator system established is from DC load
Power supply reliability, device configuration reasonability, system operation security and ageing equipment degree etc., are more comprehensively analyzed
The running status of transformer station.The quantitatively evaluating of running status health degree is carried out by specific numerical value, can be more careful
Distinguishing system runs serious conditions of problems, resulting evaluation result, with the judgement of power industry standard basic one
Cause, there are evaluation result credible and status early warning decision references to be worth.
Claims (4)
1. a kind of integrated evaluating method stood with straight-flow system running status health degree, it is characterised in that one based on foundation
Individual assessment indicator system, including：
Whether evaluation index one, equipment health indicator EHI, including station straight-flow system device configuration meet：
(1) double set configuration charging devices；(2) double set configuration batteries；(3) the charging mould based on high-frequency switching technology is used
Block；(4) N+1 pattern configurations charging modules are pressed；(5) the effective decompression regulator of configuration；(6) whether batteries rated capacity
Meet that accident electric discharge requires；(7) whether feeder switch capacity meets power reguirements；(8) direct current is spaced apart with whether fuse meets
Differential requirement；(9) whether straight-flow system main electrical scheme meets demand of technical standard；(10) direct current cabinet has anti-failure measure；(11)
Batteries have anti-failure measure；
Whether evaluation index two, operation health indicator OHI, including station straight-flow system meet following urgent operation defects：
(1) dc bus decompression；(2) dc bus is grounded entirely；(3) batteries are caught fire or exploded；(4) batteries short circuit；
(5) batteries are opened a way；(6) batteries outlet fuse blows；(7) charging device outlet dc switch tripping operation；(8) charge
Two sections of AC interruptions of device；(9) charging device failure or single set charging device 2 and above charging module failure；(10)
Silicon reduction voltage loop is opened a way；(11) dc switch tripping operation causes important protection or control loop dead electricity；(12) DC feeder branch road is complete
Full ground connection；
And whether station straight-flow system meets following great operational defect：
(1) dc bus mistake/under-voltage；(2) direct current interruption is grounded but wouldn't influence system normal operation；(3) under accumulator capacity
Drop to below 80% rated capacity or be unsatisfactory for switch divide-shut brake requirement；(4) the swollen tripe of battery, shell are damaged；(5) battery list
Body mistake/under-voltage or floating current is unsatisfactory for requiring；(6) battery generates heat, and case temperature is exceeded；(7) charging device exchanges all the way
Power interruptions；(8) charging device voltage stabilizing, current stabilization are unsatisfactory for requiring；(9) silicon reduction voltage loop automatically adjusts exception；(10) silicon is depressured
The manual dysregulation in loop；(11) insignificant DC load dc switch tripping operation；(12) there is looped network in straight-flow system；(13) direct current
Feeder line grounding alerts；(14) feeder switch is spaced apart using exchange；
And whether station straight-flow system meets following general operational defect：(1) auxiliary equipment failure or damage in battery room；
(2) batteries in flakes, pole corrosion, oxidation phenomenon be present；(3) battery sepage；(4) single charging module failure；(5) it is straight
It is bad to flow auxiliary contacts of circuit breaker；
Evaluation index three, service life index, including year is used by charging device service life index RYI_CH and batteries
Limit index RYI_BAT；
Evaluation index four, straight-flow system static security index, including the electric current of node voltage breadth coefficient UDCDI and feeder line branch road
Breadth coefficient IDCDI；
The integrated evaluating method specifically includes：
Step 1, the assessment indicator system based on foundation carries out the calculating of station straight-flow system evaluation index；
Step 2, it is standardized for the evaluation index result of calculation that step 1 is calculated：For direct current system to be evaluated
System j index i, standardized method needle set index weigh type and carry out selective processing：
Selection processing one：When index is direct index, i.e. index result is the bigger the better, and its standardization formula is:
In formula one, xijRepresent index result of calculation；Respectively index i { xij, j=1,2 ... n } in maximum
And minimum value；
Selection processing two：When index is inverse indicators, i.e. achievement data is the smaller the better, and its standardization formula is：
Selection processing three：When index is appropriateness index, i.e. achievement data is closerBetter, its standardization formula is：
In formulaFor index i best stabilized value；
Step 3, the standardization evaluation index obtained for step 2 carries out the subjective weights based on advanced AHP, and is based on
The Objective Weight of standard deviation and mean difference；
Step 4, the subjective weights and Objective Weight result obtained based on step 3, are entered based on combination weighting using weighting method
Row overall merit, specifically define and obtained subjective weight vectors W1=[w11 w12 … w1m] and objective weight vector W2=
[w21 w22 … w2m], then linear combination weight is W=k1W1+k2W2(k1+k2=1, k1≥0,k2>=0), k1And k2Root can be distinguished
It is configured according to the significance level of subjective and objective weight, k1And k2Represent that subjective and objective weight has identical importance equal to 0.5；Profit
It is with the comprehensive evaluation value of straight-flow system running status health degree to station to be evaluated with plus weighting evaluating modelWherein, j represents straight-flow system quantity to be evaluated, and i represents evaluation index quantity.
2. a kind of integrated evaluating method stood with straight-flow system running status health degree according to claim 1, it is special
Sign is, the step 1, and the computational methods of each evaluation index are specially：
Index one：Equipment health indicator ED computational methods are as shown in formula one；
In formula four, eiFor the value of i-th of statistical items in 11 equipment health indicator statistical items, ei=1 i-th of statistical items of expression expire
Toe mark check requirements, ei=0 foot with thumb down；
Index two：Health indicator OHI computational methods are run as shown in formula five；
In formula five, nOHITo run the statistics number of health assessment indicators；eOHI,iTo run the value of the ith of health indicator statistics,
Its computational methods refers to formula six；
In formula six, ni、njAnd nkRepresent that straight-flow system runs the statistics item number of urgent defect, significant deficiency and general defect respectively；
eiRepresent that i-th of urgent operation defect whether there is, ei=1 represents exist, ei=0 represents to be not present；ejRepresent j-th it is great
Operational defect whether there is, ej=1 represents exist, ei=0 expression is not present；ekRepresent whether the general defects of k-th of yi deposit
In ek=1 represents exist, ek=0 expression is not present；Parameter kOHI,1、kOHI,2、kOHI,3For weight coefficient；
Index three：The computational methods of service life index are as shown in formula seven；
In formula seven, the entirety of charging device or battery that T represents puts into operation the time limit, when not considering the maintenance record of each equipment
Between, unit year；TyeRepresent the design life of charging device or battery, unit year；T1And T2Respectively service life
Two comparison threshold values；Parameter kRYI,1、kRYI,2For service life this with regard to coefficient；
Index four：Static security index includes
Node voltage breadth coefficient UDCDI computational methods are as shown in formula eight；
In formula eight, nUDCDIFor the statistics number of node voltage breadth coefficient；eUDCDI,iFor the i-th of node voltage breadth coefficient index
Secondary statistical value, its computational methods refer to formula nine；
In formula nine, m represents to investigate node total number；udc,lRepresent the actual motion value of l-th of node voltage investigated；ul,eExpression is examined
The specified runtime value for l-th of the node voltage examined；Pl% represents proportionality coefficient；ηu,lPenalty factor is represented, using formula ten Suo Shi points
Duan Lianxu penalties carry out the amendment of the node voltage offrating order of severity；
The breadth coefficient IDCDI of feeder line branch current computational methods are as shown in formula 11；
In formula 11, nIDCDIFor the statistics number of feeder line branch current breadth coefficient；eIDCDI,iIt is distributed for feeder line branch current and is
The ith statistical value of number index, its computational methods is formula 12；
In formula 12, q represents to investigate node total number；idc,rRepresent the actual motion value of r-th of branch current investigated；ir,eRepresent
The maximum allowable runtime value for r-th of the branch current investigated；ηi,rPenalty factor is represented, is punished using zonal cooling shown in formula 13
Penalty function carries out the amendment of branch current stability margin；
In formula 13, Pr% represents the proportion threshold value of setting.
3. a kind of integrated evaluating method stood with straight-flow system running status health degree according to claim 1, it is special
Sign is that the specific method of the subjective weights based on advanced AHP is in step 3：Sentenced by the foundation of comparing two-by-two of evaluation index
Disconnected matrix A=(aij)m×m, by the eigenvalue of maximum λ for solving judgment matrix Amax, checked using formula 14 and determine each index
The uniformity of relative importance sequence；
M is the number of matrix maximum order, i.e. evaluation index in formula；δCRFor random Consistency Ratio；δRIFor the random of m rank matrixes
Coincident indicator, the desired value increase and increased with order of matrix number；Work as δCR<When 0.1, it is believed that relatively heavy between the single index of level
Wanting the ranking results of degree has preferable uniformity；On the premise of consistency check is met, it is maximum special to obtain judgment matrix
Value indicative λmaxCorresponding characteristic vector, is normalized, that is, draws the subjective weight vectors between each index of same layer time.
4. a kind of integrated evaluating method stood with straight-flow system running status health degree according to claim 1, it is special
Sign is that the specific method of the Objective Weight based on standard deviation and mean difference in step 3 is：Standard deviation and average difference method are logical
Cross calculating and do not consider that the standard deviation of index during weight coefficient W, mean difference obtain objective weight；Weighing vector W selection should make
Total standard deviation and (or) the overall average difference of all evaluation indexes are maximum, i.e.,：
In formula 15, F (W) is fitness function；Parameter alpha and β are weight coefficient, meet alpha+beta=1 and α >=0, β >=0, the table of α=0
Show and only consider mean difference without considering standard deviation, β=0 represents only to consider standard deviation without considering mean difference, and α and β are not 0 table
Show while take into account standard deviation and mean difference；M represents evaluation index quantity；N represents that straight-flow system quantity is used at station to be evaluated；σiAnd μi
When representing not considering weight coefficient W respectively, evaluation index i standard deviation and and mean difference；WiRepresent index i consider standard deviation and
The objective weight of mean difference；To the optimization problem of formula 15, can obtain：The 15 optimal problem solutions；
Perseverance can prove in theoryFor object function F (W) unique maximum point；Because traditional adds
Weight vector is typically all to meet normalization constraints rather than unitization constraints, therefore, obtain it is unitization weight to
AmountAfterwards, in addition it is also necessary to rightIt is normalized, i.e.,:
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