CN109522615A - The zero sequence of relay protection of power system is shoved tolerance appraisal procedure and device - Google Patents

The zero sequence of relay protection of power system is shoved tolerance appraisal procedure and device Download PDF

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Publication number
CN109522615A
CN109522615A CN201811258261.8A CN201811258261A CN109522615A CN 109522615 A CN109522615 A CN 109522615A CN 201811258261 A CN201811258261 A CN 201811258261A CN 109522615 A CN109522615 A CN 109522615A
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zero
section
sequence current
information
sequence
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CN109522615B (en
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刘尧
刘芳冰
陶亚光
韩伟
李琼林
周宁
党奇
党一奇
赵理
肖寒
耿进锋
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Henan Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Henan Electric Power Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2111/00—Details relating to CAD techniques
    • G06F2111/08—Probabilistic or stochastic CAD
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2117/00—Details relating to the type or aim of the circuit design
    • G06F2117/02—Fault tolerance, e.g. for transient fault suppression
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation

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Abstract

It shoves tolerance appraisal procedure and device the invention discloses the zero sequence of relay protection of power system, whether parameter needed for inspection risk assessment is complete first；When parameter information is complete, simulation calculation goes out the maximum fundamental wave peak value and damping time constant that zero sequence is shoved, and extrapolates the zero-sequence current amplitude when reaching setting time, in conjunction with setting current judge this section protection whether malfunction；When single parameter information missing; by the zero-sequence current fundamental wave peak value under switching angles different in a cycle; corresponding switching angle-zero-sequence current fundamental wave peak value figure is drawn out, the combined floodgate angle information lacked is supplemented, substitutes into the malfunction probability that simulation calculation finally obtains this section protection.When lacking more than one parameter, same type typical data in database is substituted into, obtains aggregative weighted malfunction probability using weight distribution principle.Regardless of parameter information is complete or missing can all obtain malfunction probability, it can be used for the Construction and operation for instructing whether to carry out closing operation and substation.

Description

The zero sequence of relay protection of power system is shoved tolerance appraisal procedure and device
Technical field
It shoves the present invention relates to the zero sequence of the technical field of electric system more particularly to relay protection of power system and is resistant to energy Force estimation method and device.
Background technique
Zero-sequence current protection has the advantages that significant in terms of improving ground protection, is widely used in In the power grid of 110kV and above.With high-impedance transformer constantly come into operation, close a floodgate generate shove compared with Conventional transformer shoves, and amplitude is bigger, and decaying is more slow, repeatedly causes the zero-sequence current protection malfunction of partial region, seriously Special the stablizing of power train has been threatened to be safely operated.Currently, about the influence and countermeasure shoved to protection research gradually Carry out, belongs to " passive " analysis and reply of monomer-type mostly.It naturally, if can be from system level to this kind of protective device face The risk faced carries out " active " assessment, gives certain risk warning, can be newly-built substation or the substation's change that put into operation The air-drop of depressor provides corresponding instruction to evade such malfunction event.
In recent years, the research that relay protection risk quantification is analyzed just gradually is being risen with probabilistic method.Risk assessment By the probability of happening of forecasting risk event, its influence that may cause of analysis quantization is lost, and determines the ability for bearing risk.Have Scholar devises corresponding risk assessment probabilistic model for the protection of different principle in power train spy.Some scholars utilize and go through History data method, the POWER SYSTEM STATE of statistical time section is distributed and shifts to obtain Markov state matrix one by one, passes through solution Analysis method obtains future state probability distribution.More specifically for zero-sequence current protection, there is researcher according to actual motion state It is established with protection definite value and calculates zero-sequence current protection principle operational failure probability, by specific load loss and power generation loss The real time execution risk assessment of system is introduced as risk indicator.
Though the risk assessment of protective relaying device has obtained great success, however it is being applied to new scene --- transformer When air-drop leads to zero-sequence current protection malfunction, it will certain inadaptability occur.In terms of protection philosophy model, for shoving Caused by current protection malfunction be the protection philosophy design aspect due to caused by under special scenes blind area, traditional risk assessment The risk assessment of delimitation tripping malfunction probability of the model based on protection scope principle is no longer applicable in.In addition, in risk evaluation model The introducing that can be related to multiple parametric datas carrys out Auxiliary Principle judgement, if the risk assessment side that required parameter is incomplete, traditional Method will be entirely ineffective.
Summary of the invention
For overcome the deficiencies in the prior art, the purpose of the present invention is to provide the zero sequences of relay protection of power system to shove Tolerance appraisal procedure and device, it is intended to solve to examine tolerance aspect shortcoming of shoving in current risk appraisal procedure Consider, existing methods of risk assessment directly transplanting can there are problems that failing under inadaptability and parameter deletion condition.
The purpose of the present invention is implemented with the following technical solutions:
A kind of zero sequence of relay protection of power system is shoved tolerance appraisal procedure, comprising:
Complete appraisal procedure:
According to actual operating mode, whether parameter information needed for examining risk assessment is complete；The parameter information includes closing Lock angle information, remanent magnetism information, method of operation information, system voltage information, line parameter circuit value information；
If it is, into the complete step of parameter information；
Otherwise enter parameter information deletion procedure；
The complete step of parameter information:
Simulation calculation is carried out according to parameter information, obtains the maximum fundamental wave peak value and damping time constant that zero sequence is shoved；
Maximum fundamental wave peak value, damping time constant, the every section of setting time protected to be shoved using zero sequence is extrapolated and is being reached Zero-sequence current amplitude when to setting time；
By the zero-sequence current amplitude extrapolated compared with setting current, the malfunction probability of every section of zero-sequence current protection is obtained；
According to the tolerance of this section of zero-sequence current of malfunction probability assessment of every section of zero-sequence current protection；
Parameter information deletion procedure:
This section of zero-sequence current protection of initiation is instead released by the setting current and setting time of every section of zero-sequence current protection to miss Dynamic zero sequence is shoved minimum basis crest value；
It must attend the meeting according to the resulting switching angle-zero sequence of simulation calculation fundamental wave peak value relationship of shoving and cause this section of zero-sequence current and protect Protect the combined floodgate section of malfunction；
Ratio is made into obtained combined floodgate section and minimum period of closing a floodgate, obtain the malfunction probability of this section of zero-sequence current protection；
According to the tolerance of this section of zero-sequence current of malfunction probability assessment of every section of zero-sequence current protection.
On the basis of the above embodiments, it is preferred that the complete step of parameter information, specifically:
Simulation calculation is carried out according to parameter information, obtains the maximum fundamental wave peak I that zero sequence is shoved0MWith damping time constant τ；
The maximum fundamental wave peak I shoved using zero sequence0M, damping time constant τ, i-th section of zero-sequence current protection adjusting when Between tiExtrapolate i-th section of zero-sequence current amplitude when reaching setting timeI, n is positive integer, 1≤i≤n, n zero Total number of segment of sequence current protection；
It willWith the setting current I of i-th section of zero-sequence current protection0set.iIt compares；
IfThen the malfunction probability of i-th section of zero-sequence current protection is PWL.i=1；
IfThen the malfunction probability of i-th section of zero-sequence current protection is PWL.i=0；
According to the tolerance of i-th section of zero-sequence current of malfunction probability assessment of i-th section of zero-sequence current protection.
On the basis of above-mentioned any embodiment, it is preferred that if switching angle loss of learning, remanent magnetism information, the method for operation Information, system voltage information, line parameter circuit value information are it is known that the then parameter information deletion procedure, comprising:
Single parameter information deletion procedure:
By the zero-sequence current fundamental wave peak value under switching angles different in a cycle, corresponding switching angle-zero sequence is drawn out Current first harmonics peak value figure supplements the combined floodgate angle information lacked, and carries out simulation calculation on this basis, obtains zero sequence The damping time constant shoved:Wherein L is equivalent inductance, and R is equivalent resistance；
Utilize the setting current I of i-th section of zero-sequence current protection0set.iWith setting time ti, instead release i-th section of zero-sequence current The zero sequence of protection is shoved minimum basis crest value are as follows:
Pass throughTo determine αiL、αiR, αiL、αiRFor the adjacent two combined floodgates limit Angle, and αiL< αiR；In formula, α is switching angle, αiFor the switching angle of i-th section of zero-sequence current protection；
Combined floodgate siding-to-siding block length ‖ αi‖ are as follows: ‖ αi| |=αiR-αiL；
Pass through αTmin=min { αT1、αT2... }: I0M(α)=I0M(α+αT) determine that the minimum of zero-sequence current fundamental wave peak value closes Lock period alphaTmin；In formula, αT1It closes a floodgate the period for T1, αT2It closes a floodgate the period for T2；
Utilize combined floodgate siding-to-siding block length | | αi| | and minimum combined floodgate period alphaTmin, the malfunction for calculating i-th section of zero-sequence current protection is general Rate are as follows:
According to the tolerance of i-th section of zero-sequence current of malfunction probability assessment of i-th section of zero-sequence current protection.
On the basis of the above embodiments, it is preferred that if switching angle loss of learning, remanent magnetism information, method of operation information, One of system voltage information, line parameter circuit value information lack, then the parameter information deletion procedure, further includes:
Double parameter information deletion procedures:
For a kind of parameter lacked in remanent magnetism information, method of operation information, system voltage information, line parameter circuit value information Information A chooses the representative value of n group missing parameter information A from database；
Using the representative value of Group X missing parameter information A as known parameter information, into single parameter information deletion procedure, The malfunction probability for calculating the lower i-th section of zero-sequence current protection of representative value of Group X missing parameter A is PWL(X).i；
The then aggregative weighted malfunction probability of the lower i-th section of zero-sequence current protection of representative value of n group missing parameter information A are as follows:
In formula, JXThe weight of the lower i-th section of zero-sequence current protection malfunction probability of representative value of parameter information A is lacked for Group X, The weight of different section zero-sequence current protection malfunction probability is identical, and
According to the tolerance of i-th section of zero-sequence current of malfunction probability assessment of i-th section of zero-sequence current protection.
On the basis of the above embodiments, it is preferred that if switching angle loss of learning, remanent magnetism information, method of operation information, Two kinds in system voltage information, line parameter circuit value information lack, then the parameter information deletion procedure, further includes:
Tri-consult volume loss of learning step:
For the two kinds of parameters lacked in remanent magnetism information, method of operation information, system voltage information, line parameter circuit value information Information A, B chooses the representative value of m group missing parameter information B from database；
Using the representative value of Y group missing parameter information B as known parameter information, into double parameter information deletion procedures, Calculate the aggregative weighted malfunction probability of the lower i-th section of zero-sequence current protection of representative value of Y group missing parameter information B are as follows:
The then aggregative weighted malfunction probability of the lower i-th section of zero-sequence current protection of representative value of m group missing parameter information B are as follows:
In formula, JYThe weight of the lower i-th section of zero-sequence current protection malfunction probability of representative value of parameter information B is lacked for Y group, The weight of different section zero-sequence current protection malfunction probability is identical, and
According to the tolerance of i-th section of zero-sequence current of malfunction probability assessment of i-th section of zero-sequence current protection.
On the basis of above-mentioned any embodiment, it is preferred that the malfunction probability according to every section of zero-sequence current protection is commented Estimate the tolerance of this section of zero-sequence current, specifically:
Operation for the parameter completeness that malfunction probability is 0, assessment result are that transformer air-drop not will lead to zero sequence electricity False protection is flowed, transformer can be carried out and put into operation；
For parameter Deletional operation of the malfunction probability in (0,0.2) section, assessment result be transformer air-drop have compared with Small risk leads to zero-sequence current protection malfunction, can carry out transformer and put into operation；
The Deletional operation of parameter for malfunction probability in (0.2,0.7) and (0.7,1.0) section, assessment result is transformation Device air-drop has medium and high risk to lead to zero-sequence current protection malfunction, it is proposed that not carry out transformer and put into operation；
Operation for the parameter completeness that malfunction probability is 1, assessment result are that zero-sequence current protection is certain to malfunction, wind Danger reaches peak, is not available for transformer and puts into operation.
A kind of zero sequence of relay protection of power system is shoved tolerance assessment device, comprising:
Complete evaluation module, is used for:
According to actual operating mode, whether parameter information needed for examining risk assessment is complete；The parameter information includes closing Lock angle information, remanent magnetism information, method of operation information, system voltage information, line parameter circuit value information；
If it is, calling the complete module of parameter information；
Otherwise parameter information is called to lack module；
The complete module of parameter information, is used for:
Simulation calculation is carried out according to parameter information, obtains the maximum fundamental wave peak value and damping time constant that zero sequence is shoved；
Maximum fundamental wave peak value, damping time constant, the every section of setting time protected to be shoved using zero sequence is extrapolated and is being reached Zero-sequence current amplitude when to setting time；
By the zero-sequence current amplitude extrapolated compared with setting current, the malfunction probability of every section of zero-sequence current protection is obtained；
According to the tolerance of this section of zero-sequence current of malfunction probability assessment of every section of zero-sequence current protection；
Parameter information lacks module, is used for:
This section of zero-sequence current protection of initiation is instead released by the setting current and setting time of every section of zero-sequence current protection to miss Dynamic zero sequence is shoved minimum basis crest value；
It must attend the meeting according to the resulting switching angle-zero sequence of simulation calculation fundamental wave peak value relationship of shoving and cause this section of zero-sequence current and protect Protect the combined floodgate section of malfunction；
Ratio is made into obtained combined floodgate section and minimum period of closing a floodgate, obtain the malfunction probability of this section of zero-sequence current protection；
According to the tolerance of this section of zero-sequence current of malfunction probability assessment of every section of zero-sequence current protection.
On the basis of the above embodiments, it is preferred that the complete module of parameter information is used for:
Simulation calculation is carried out according to parameter information, obtains the maximum fundamental wave peak I that zero sequence is shoved0MWith damping time constant τ；
The maximum fundamental wave peak I shoved using zero sequence0M, damping time constant τ, i-th section of zero-sequence current protection adjusting when Between tiExtrapolate i-th section of zero-sequence current amplitude when reaching setting timeI, n is positive integer, 1≤i≤n, n zero Total number of segment of sequence current protection；
It willWith the setting current I of i-th section of zero-sequence current protection0set.iIt compares；
IfThen the malfunction probability of i-th section of zero-sequence current protection is PWL.i=1；
IfThen the malfunction probability of i-th section of zero-sequence current protection is PWL.i=0；
According to the tolerance of i-th section of zero-sequence current of malfunction probability assessment of i-th section of zero-sequence current protection.
On the basis of above-mentioned any embodiment, it is preferred that if switching angle loss of learning, remanent magnetism information, the method for operation Information, system voltage information, line parameter circuit value information are it is known that then the parameter information lacks module, comprising:
Single parameter information lacks module, is used for:
By the zero-sequence current fundamental wave peak value under switching angles different in a cycle, corresponding switching angle-zero sequence is drawn out Current first harmonics peak value figure supplements the combined floodgate angle information lacked, and carries out simulation calculation on this basis, obtains zero sequence The damping time constant shoved:Wherein L is equivalent inductance, and R is equivalent resistance；
Utilize the setting current I of i-th section of zero-sequence current protection0set.iWith setting time ti, instead release i-th section of zero-sequence current The zero sequence of protection is shoved minimum basis crest value are as follows:
Pass throughTo determine αiL、αiR, αiL、αiRFor the adjacent two combined floodgates limit Angle, and αiL< αiR；In formula, α is switching angle, αiFor the switching angle of i-th section of zero-sequence current protection；
Combined floodgate siding-to-siding block length | | αi| | are as follows: | | αi| |=αiR-αiL；
Pass through αTmin=min { αT1、αT2... }: I0M(α)=I0M(α+αT) determine that the minimum of zero-sequence current fundamental wave peak value closes Lock period alphaTmin；In formula, αT1It closes a floodgate the period for T1, αT2It closes a floodgate the period for T2；
Utilize combined floodgate siding-to-siding block length | | αi| | and minimum combined floodgate period alphaTmin, the malfunction for calculating i-th section of zero-sequence current protection is general Rate are as follows:
According to the tolerance of i-th section of zero-sequence current of malfunction probability assessment of i-th section of zero-sequence current protection.
On the basis of the above embodiments, it is preferred that if switching angle loss of learning, remanent magnetism information, method of operation information, One of system voltage information, line parameter circuit value information missing, then the parameter information lacks module, further includes:
Double parameter informations lack module, are used for:
For a kind of parameter lacked in remanent magnetism information, method of operation information, system voltage information, line parameter circuit value information Information A chooses the representative value of n group missing parameter information A from database；
Using the representative value of Group X missing parameter information A as known parameter information, single parameter information is called to lack module, The malfunction probability for calculating the lower i-th section of zero-sequence current protection of representative value of Group X missing parameter A is PWL(X).i；
The then aggregative weighted malfunction probability of the lower i-th section of zero-sequence current protection of representative value of n group missing parameter information A are as follows:
In formula, JXThe weight of the lower i-th section of zero-sequence current protection malfunction probability of representative value of parameter information A is lacked for Group X, The weight of different section zero-sequence current protection malfunction probability is identical, and
According to the tolerance of i-th section of zero-sequence current of malfunction probability assessment of i-th section of zero-sequence current protection.
Compared with prior art, the beneficial effects of the present invention are:
It shoves tolerance appraisal procedure and device the invention discloses the zero sequence of relay protection of power system, relay is protected It protects the malfunction probability level when shoving in face of zero sequence to introduce, the tolerance that shoves of zero-sequence current multi-stage protective is commented Estimate；Targetedly different parameters missing scene is considered, according to each parameter completeness of generation of shoving is influenced, devises difference Zero-sequence current protection malfunction probability method for solving under parameter completeness；Relay protection risk assessment be can make up for it in tolerance of shoving Missing in terms of capability evaluation fills up the blank of this aspect.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
The zero sequence that Fig. 1 shows a kind of relay protection of power system provided in an embodiment of the present invention shove tolerance assessment The flow diagram of method；
Fig. 2 shows a kind of switching angle-zero-sequence current fundamental wave peak value relational graphs provided in an embodiment of the present invention；
The zero sequence that Fig. 3 shows a kind of relay protection of power system provided in an embodiment of the present invention shove tolerance assessment The structural schematic diagram of device.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to the present invention, it should be noted that not Under the premise of conflicting, new implementation can be formed between various embodiments described below or between each technical characteristic in any combination Example.
Specific embodiment one
In view of transformer during no-load closing generation is shoved by multifactor, such as the influence of switching angle, remanent magnetism, the method for operation, As can obtaining each specific data for influencing parameter, it can be deduced by the calculating of computer simulation software and obtain certain in specific network Section zero-sequence current protection is influenced the probability of malfunction by excitation surge current.In view of in practical risk assessment, each parameter information is for example closed The integrality of the system parameters such as lock angle, remanent magnetism, the method for operation does not ensure that, this is arranged in the design of risk evaluating system Multiple modules enter different malfunction risk probability computing modules according to the integrity degree of information.Entire risk assessment thinking such as Fig. 1 It is shown.
Whether parameter needed for examining risk assessment according to existing actual operating mode first is complete, complete according to parameter information Property enters different risk probability computing modules；
In the case that parameter information is complete, each parameter information is inputted into computer simulation system, simulation calculation goes out zero sequence and gushes The maximum fundamental wave peak value of stream and damping time constant of shoving is extrapolated, utilizes maximum fundamental wave peak value, damping time constant and specific The setting time of protection extrapolates the zero-sequence current amplitude when reaching setting time；By this amplitude compared with setting current, sentence Break this section protection whether malfunction；
In the case that parameter information lacks, simulation calculation and weight distribution principle mainly are substituted into representative value supplement: first It first passes through the setting current specifically protected and setting time and instead releases and cause the zero sequence of this section of false protection and shove minimum basis wave crest Value must attend the meeting according to the resulting switching angle-zero sequence of simulation calculation fundamental wave peak value relationship of shoving and cause the combined floodgate of this section of false protection The malfunction probability than this section protection can be obtained is made with the minimum period of closing a floodgate in section.When there is more than one parameter missing, then will The same type typical data stored in database substitutes into supplement calculation and distributes certain weight ratio, finally obtains aggregative weighted mistake Dynamic probability.
Regardless of parameter information is complete or missing, specific zero-sequence current protection can be all obtained in face of the mistake after occurring of shoving Dynamic probability instructs the construction fortune for whether carrying out closing operation and substation according to this probability and specific combined floodgate principle Row.
Same place protection is usually mounted with multistage zero-sequence current protection (such as I section, II section, III section, IV section of zero sequence), is adjusted Electric current and actuation time are often different, judge whether malfunction respectively for each section of zero-sequence current protection.
In addition, being combined in the case that specified operating condition and each parameter information has completely according to topological zero-sequence network Design parameter acquires the zero sequence that each protection installation place is flowed through and shoves, and acquires the fundametal compoment that zero sequence is shoved by Fourier decomposition Iμ0, its fundamental wave peak I is further obtained in the way of difference or derivation0M。
As shown in Figure 1, the embodiment of the invention provides a kind of zero sequence of relay protection of power system tolerances that shoves to comment Estimate method, comprising:
Complete appraisal procedure:
According to actual operating mode, whether parameter information needed for examining risk assessment is complete；The parameter information at least wraps Include combined floodgate angle information, remanent magnetism information, method of operation information, system voltage information, line parameter circuit value information；
If it is, into the complete step of parameter information；
Otherwise enter parameter information deletion procedure；
The complete step of parameter information:
Simulation calculation is carried out according to parameter information, obtains the maximum fundamental wave peak value and damping time constant that zero sequence is shoved；
Maximum fundamental wave peak value, damping time constant, the every section of setting time protected to be shoved using zero sequence is extrapolated and is being reached Zero-sequence current amplitude when to setting time；
By the zero-sequence current amplitude extrapolated compared with setting current, the malfunction probability of every section of zero-sequence current protection is obtained；
According to the tolerance of this section of zero-sequence current of malfunction probability assessment of every section of zero-sequence current protection；
Parameter information deletion procedure:
This section of zero-sequence current protection of initiation is instead released by the setting current and setting time of every section of zero-sequence current protection to miss Dynamic zero sequence is shoved minimum basis crest value；
It must attend the meeting according to the resulting switching angle-zero sequence of simulation calculation fundamental wave peak value relationship of shoving and cause this section of zero-sequence current and protect Protect the combined floodgate section of malfunction；
Ratio is made into obtained combined floodgate section and minimum period of closing a floodgate, obtain the malfunction probability of this section of zero-sequence current protection；
According to the tolerance of this section of zero-sequence current of malfunction probability assessment of every section of zero-sequence current protection.
Preferably, the complete step of the parameter information, can be with specifically:
Simulation calculation is carried out according to parameter information, obtains the maximum fundamental wave peak I that zero sequence is shoved0MWith damping time constant τ；
The maximum fundamental wave peak I shoved using zero sequence0M, damping time constant τ, i-th section of zero-sequence current protection adjusting when Between tiExtrapolate i-th section of zero-sequence current amplitude when reaching setting timeI, n is positive integer, 1≤i≤n, n zero Total number of segment of sequence current protection；
It willWith the setting current I of i-th section of zero-sequence current protection0set.iIt compares；
IfThen the malfunction probability of i-th section of zero-sequence current protection is PWL.i=1；
IfThen the malfunction probability of i-th section of zero-sequence current protection is PWL.i=0；
According to the tolerance of i-th section of zero-sequence current of malfunction probability assessment of i-th section of zero-sequence current protection.
I-th section of zero-sequence current protection meets formulaWhen, the probability of this section of false protection is PWL.i=1, otherwise its Probability is PWL.i=0.When each parameter information has all had, transformer, which has closed a floodgate, to put into operation, related zero-sequenceprotection whether malfunction For deterministic case, the risk assessment that progress transformer during no-load closing may cause zero-sequenceprotection malfunction at this time can not be played accordingly Warning meaning, but its assessment result can whether the result of malfunction compares with current zero-sequenceprotection, to examine assessment system Accuracy and validity.
It is usually before transformer puts into operation in the risk assessment that may cause zero-sequenceprotection malfunction to transformer during no-load closing It carries out, the closing moment that puts into operation determines closing phase angle, therefore switching angle carries out the simulation calculation process of risk assessment before putting into operation In be unknown., can not whether malfunction carries out to zero-sequence current protection in addition, also will appear the situation of other parameter informations deficiency Directly judge, the present invention only analyze by the scene certain to several typical parameter information as space is limited,.In view of zero sequence The fundamental wave peak I for fundametal compoment of shoving0MIt is two key variables of leading zero sequence inrush with damping time constant τ, it can benefit Use I0MConcatenation important played in the risk assessment effect with τ is to rely on switching angle-zero-sequence current fundametal compoment peak relationship, Construct the risk assessment probabilistic model of parameter information missing.
When transformer puts into operation, all many reference amounts such as system voltage, the method for operation, line parameter circuit value all be determine known to, The most complicated remanent magnetism can also measure the appraisal of (such as fluxmeter WB-1)/empirical data in several ways and obtain.In this case, It has switching angle loss of learning only, calculates the zero sequence electricity in a cycle under (360 °) different switching angles by computer simulation system Fundamental wave peak value is flowed, and draws out corresponding switching angle-zero-sequence current fundamental wave peak value figure, as shown in Figure 2.Preferably, if closed a floodgate Angle information missing, remanent magnetism information, method of operation information, system voltage information, line parameter circuit value information are it is known that the then parameter information Deletion procedure may include:
Single parameter information deletion procedure:
By the zero-sequence current fundamental wave peak value under switching angles different in a cycle, corresponding switching angle-zero sequence is drawn out Current first harmonics peak value figure supplements the combined floodgate angle information lacked, and carries out simulation calculation on this basis, obtains zero sequence The damping time constant shoved:Wherein L is equivalent inductance, and R is equivalent resistance；
Utilize the setting current I of i-th section of zero-sequence current protection0set.iWith setting time ti, instead release i-th section of zero-sequence current The zero sequence of protection is shoved minimum basis crest value are as follows:
Pass throughTo determine αiL、αiR, αiL、αiRFor the adjacent two combined floodgates limit Angle, and αiL< αiR；In formula, α is switching angle, αiFor the switching angle of i-th section of zero-sequence current protection；
In view of in a cycle there may be multiple combined floodgate limiting angles, combined floodgate siding-to-siding block length | | αi| | are as follows: | | αi| |= αiR-αiL；
Pass through αTmin=min { αT1、αT2... }: I0M(α)=I0M(α+αT) determine that the minimum of zero-sequence current fundamental wave peak value closes Lock period alphaTmin；In formula, αT1It closes a floodgate the period for T1, αT2It closes a floodgate the period for T2；
Utilize combined floodgate siding-to-siding block length | | αi| | and minimum combined floodgate period alphaTmin, the malfunction for calculating i-th section of zero-sequence current protection is general Rate are as follows:
According to the tolerance of i-th section of zero-sequence current of malfunction probability assessment of i-th section of zero-sequence current protection.
When certain drops progress risk assessment to transformer, due to the complexity of measurement of residual magnetism, it is sometimes difficult in transformation Device operation scene measures；In addition, estimating if empirical data is not enough to support to this transformer core remanent magnetism, iron core is surplus Magnetic is unknown quantity, in such cases, adds the unknown scene for constituting double parameter information missings of switching angle.Network system is usual Equipment state operational monitoring database can be equipped with to store fault data, operation data and historical data etc..From database Typically different remanent magnetism parameter (can drop data for this transformer history or other transformers are empty when choosing the air-drop of n group transformer Throw data), every group of remanent magnetism as known parameter and is substituted into relevant calculation, i.e., using only closing in single parameter information deletion procedure Risk assessment probability method for solving under the unknown single parameter information missing scene in lock angle solves the mistake under double parameter information missings Dynamic probability.
Preferably, if switching angle loss of learning, remanent magnetism information, method of operation information, system voltage information, line parameter circuit value One of information lacks, then the parameter information deletion procedure, can also include:
Double parameter information deletion procedures:
For a kind of parameter lacked in remanent magnetism information, method of operation information, system voltage information, line parameter circuit value information Information A chooses the representative value of n group missing parameter information A from database；
Using the representative value of Group X missing parameter information A as known parameter information, into single parameter information deletion procedure, The malfunction probability for calculating the lower i-th section of zero-sequence current protection of representative value of Group X missing parameter A is PWL(X).i；
The then aggregative weighted malfunction probability of the lower i-th section of zero-sequence current protection of representative value of n group missing parameter information A are as follows:
In formula, JXThe weight of the lower i-th section of zero-sequence current protection malfunction probability of representative value of parameter information A is lacked for Group X, The weight of different section zero-sequence current protection malfunction probability is identical, and
According to the tolerance of i-th section of zero-sequence current of malfunction probability assessment of i-th section of zero-sequence current protection.
For certain substation regions to be developed newly put into operation, progress zero-sequenceprotection malfunction risk is dropped to its transformer and is commented Estimate the scene for being often faced with more parameter information missings, it similarly can be by same " class " typical data pair stored in database It is supplemented, and carries out simulation calculation on this basis, by obtained malfunction probability multiplied by certain weight, obtains aggregative weighted Probability.By taking system operation mode, remanent magnetism and switching angle are unknown as an example, sketch it and makes a concrete analysis of solution procedure:
When system operation mode is unknown, the attenuation constant of equivalent system impedance and zero-sequence current fundamental wave just can not be true It is fixed, merely with the setting current I of zero-sequenceprotection0set.iWith adjusting actuation time tiZero-sequence current fundametal compoment can not be back-calculated to obtain Fundamental wave peak I0Mf.i.In view of system is usually run under several specific run modes, m group typical operation modes can be chosen (such as m=2 only chooses the big method of operation and the small method of operation), under every group of specific run mode, other parameters in addition to the method for operation It still can be considered that unknown quantity, tri-consult volume loss of learning just convert the double parameter information missing scenes of dimension, copy in double parameter information steps Method can solve false protection risk probability under every group of specific run mode.
Preferably, if switching angle loss of learning, remanent magnetism information, method of operation information, system voltage information, line parameter circuit value Two kinds in information lack, then the parameter information deletion procedure, can also include:
Tri-consult volume loss of learning step:
For the two kinds of parameters lacked in remanent magnetism information, method of operation information, system voltage information, line parameter circuit value information Information A, B chooses the representative value of m group missing parameter information B from database；
Using the representative value of Y group missing parameter information B as known parameter information, into double parameter information deletion procedures, Calculate the aggregative weighted malfunction probability of the lower i-th section of zero-sequence current protection of representative value of Y group missing parameter information B are as follows:
The then aggregative weighted malfunction probability of the lower i-th section of zero-sequence current protection of representative value of m group missing parameter information B are as follows:
In formula, JYThe weight of the lower i-th section of zero-sequence current protection malfunction probability of representative value of parameter information B is lacked for Y group, The weight of different section zero-sequence current protection malfunction probability is identical, and
According to the tolerance of i-th section of zero-sequence current of malfunction probability assessment of i-th section of zero-sequence current protection.
For the zero-sequence current protection of somewhere configuration multistage, in the complete situation of parameter information, the mistake of each section of protection Only there are two types of results for dynamic probability: 0 or 1；Under parameter information deletion condition, the aggregative weighted of each section of zero-sequence current protection malfunction is general Rate section is [0,1], and probability shows that more greatly shoving for transformer generation may cause the risk of zero-sequence current protection malfunction at this It is bigger.To provide evaluation index now depending on malfunction probability distribution, as shown in table 1 convenient for assessing its malfunction risk.
The different malfunction probability of table 1 correspond to risk assessment
Preferably, the tolerance of described this section of zero-sequence current of malfunction probability assessment according to every section of zero-sequence current protection, It can be with specifically:
Operation for the parameter completeness that malfunction probability is 0, has been subjected to simulation calculation inverting, assessment result is transformer Air-drop not will lead to zero-sequence current protection malfunction, can carry out transformer and put into operation；
For parameter Deletional operation of the malfunction probability in (0,0.2) section, assessment result be transformer air-drop have compared with Small risk leads to zero-sequence current protection malfunction, since risk is smaller, can carry out transformer and put into operation；
The Deletional operation of parameter for malfunction probability in (0.2,0.7) and (0.7,1.0) section, assessment result is transformation Device air-drop has medium and high risk to lead to zero-sequence current protection malfunction, it is proposed that not carry out transformer and put into operation；
Operation for the parameter completeness that malfunction probability is 1, assessment result are that zero-sequence current protection is certain to malfunction, wind Danger reaches peak, is not available for transformer and puts into operation.
And so on, if switching angle loss of learning, remanent magnetism information, method of operation information, system voltage information, route ginseng When counting the two or more missings in information, the method that can also use the embodiment of the present invention uses the parameter information lacked Representative value is supplemented, and simulation calculation is used for, and thus obtains the malfunction probability of corresponding every section of zero-sequence current protection.
The embodiment of the present invention introduces malfunction probability level of the relay protection when shoving in face of zero sequence, for zero-sequence current The tolerance that shoves of multi-stage protective is assessed；Targetedly different parameters missing scene is considered, is shoved according to influence Each parameter completeness generated, devises the zero-sequence current protection malfunction probability method for solving under different parameter completenesses；It can Missing of the relay protection risk assessment in terms of tolerance assessment of shoving is made up, the blank of this aspect is filled up.
In above-mentioned specific embodiment one, the zero sequence for providing relay protection of power system is shoved tolerance assessment side Method, it is corresponding, the zero sequence that the application also provides relay protection of power system shove tolerance assessment device.Due to dress It sets embodiment and is substantially similar to embodiment of the method, so describing fairly simple, referring to the part of embodiment of the method in place of correlation Explanation.Installation practice described below is only schematical.
Specific embodiment two
As shown in figure 3, the embodiment of the invention provides a kind of zero sequence of relay protection of power system tolerances that shoves to comment Estimate device, comprising:
Complete evaluation module 201, is used for:
According to actual operating mode, whether parameter information needed for examining risk assessment is complete；The parameter information at least wraps Include combined floodgate angle information, remanent magnetism information, method of operation information, system voltage information, line parameter circuit value information；
If it is, calling the complete module 202 of parameter information；
Otherwise parameter information is called to lack module 203；
The complete module 202 of parameter information, is used for:
Simulation calculation is carried out according to parameter information, obtains the maximum fundamental wave peak value and damping time constant that zero sequence is shoved；
Maximum fundamental wave peak value, damping time constant, the every section of setting time protected to be shoved using zero sequence is extrapolated and is being reached Zero-sequence current amplitude when to setting time；
By the zero-sequence current amplitude extrapolated compared with setting current, the malfunction probability of every section of zero-sequence current protection is obtained；
According to the tolerance of this section of zero-sequence current of malfunction probability assessment of every section of zero-sequence current protection；
Parameter information lacks module 203, is used for:
This section of zero-sequence current protection of initiation is instead released by the setting current and setting time of every section of zero-sequence current protection to miss Dynamic zero sequence is shoved minimum basis crest value；
It must attend the meeting according to the resulting switching angle-zero sequence of simulation calculation fundamental wave peak value relationship of shoving and cause this section of zero-sequence current and protect Protect the combined floodgate section of malfunction；
Ratio is made into obtained combined floodgate section and minimum period of closing a floodgate, obtain the malfunction probability of this section of zero-sequence current protection；
According to the tolerance of this section of zero-sequence current of malfunction probability assessment of every section of zero-sequence current protection.
Preferably, the complete module 202 of the parameter information, can be used for:
Simulation calculation is carried out according to parameter information, obtains the maximum fundamental wave peak I that zero sequence is shoved0MWith damping time constant τ；
The maximum fundamental wave peak I shoved using zero sequence0M, damping time constant τ, i-th section of zero-sequence current protection adjusting when Between tiExtrapolate i-th section of zero-sequence current amplitude when reaching setting timeI, n is positive integer, 1≤i≤n, n zero Total number of segment of sequence current protection；
It willWith the setting current I of i-th section of zero-sequence current protection0set.iIt compares；
IfThen the malfunction probability of i-th section of zero-sequence current protection is PWL.i=1；
IfThen the malfunction probability of i-th section of zero-sequence current protection is PWL.i=0；
According to the tolerance of i-th section of zero-sequence current of malfunction probability assessment of i-th section of zero-sequence current protection.
Preferably, if switching angle loss of learning, remanent magnetism information, method of operation information, system voltage information, line parameter circuit value Information may include: it is known that then the parameter information lacks module 203
Single parameter information lacks module 2031, is used for:
By the zero-sequence current fundamental wave peak value under switching angles different in a cycle, corresponding switching angle-zero sequence is drawn out Current first harmonics peak value figure supplements the combined floodgate angle information lacked, and carries out simulation calculation on this basis, obtains zero sequence The damping time constant shoved:Wherein L is equivalent inductance, and R is equivalent resistance；
Utilize the setting current I of i-th section of zero-sequence current protection0set.iWith setting time ti, instead release i-th section of zero-sequence current The zero sequence of protection is shoved minimum basis crest value are as follows:
Pass throughTo determine αiL、αiR, αiL、αiRFor the adjacent two combined floodgates limit Angle, and αiL< αiR；In formula, α is switching angle, αiFor the switching angle of i-th section of zero-sequence current protection；
Combined floodgate siding-to-siding block length | | αi| | are as follows: | | αi| |=αiR-αiL；
Pass through αTmin=min { αT1、αT2... }: I0M(α)=I0M(α+αT) determine that the minimum of zero-sequence current fundamental wave peak value closes Lock period alphaTmin；In formula, αT1It closes a floodgate the period for T1, αT2It closes a floodgate the period for T2；
Utilize combined floodgate siding-to-siding block length | | αi| | and minimum combined floodgate period alphaTmin, the malfunction for calculating i-th section of zero-sequence current protection is general Rate are as follows:
According to the tolerance of i-th section of zero-sequence current of malfunction probability assessment of i-th section of zero-sequence current protection.
Preferably, if switching angle loss of learning, remanent magnetism information, method of operation information, system voltage information, line parameter circuit value One of information missing, then the parameter information lacks module 203, can also include:
Double parameter informations lack module 2032, are used for:
For a kind of parameter lacked in remanent magnetism information, method of operation information, system voltage information, line parameter circuit value information Information A chooses the representative value of n group missing parameter information A from database；
Using the representative value of Group X missing parameter information A as known parameter information, single parameter information is called to lack module 2031, the malfunction probability for calculating the lower i-th section of zero-sequence current protection of representative value of Group X missing parameter A is PWL(X).i；
The then aggregative weighted malfunction probability of the lower i-th section of zero-sequence current protection of representative value of n group missing parameter information A are as follows:
In formula, JXThe weight of the lower i-th section of zero-sequence current protection malfunction probability of representative value of parameter information A is lacked for Group X, The weight of different section zero-sequence current protection malfunction probability is identical, and
According to the tolerance of i-th section of zero-sequence current of malfunction probability assessment of i-th section of zero-sequence current protection.
Preferably, if switching angle loss of learning, remanent magnetism information, method of operation information, system voltage information, line parameter circuit value Two kinds of missings in information, then the parameter information lacks module 203, can also include:
Tri-consult volume loss of learning module 2033, is used for:
For the two kinds of parameters lacked in remanent magnetism information, method of operation information, system voltage information, line parameter circuit value information Information A, B chooses the representative value of m group missing parameter information B from database；
Using the representative value of Y group missing parameter information B as known parameter information, double parameter informations is called to lack module 2032, calculate the aggregative weighted malfunction probability of the lower i-th section of zero-sequence current protection of representative value of Y group missing parameter information B are as follows:
The then aggregative weighted malfunction probability of the lower i-th section of zero-sequence current protection of representative value of m group missing parameter information B are as follows:
In formula, JYThe weight of the lower i-th section of zero-sequence current protection malfunction probability of representative value of parameter information B is lacked for Y group, The weight of different section zero-sequence current protection malfunction probability is identical, and
According to the tolerance of i-th section of zero-sequence current of malfunction probability assessment of i-th section of zero-sequence current protection.
Preferably, the tolerance of described this section of zero-sequence current of malfunction probability assessment according to every section of zero-sequence current protection, It can be with specifically:
Operation for the parameter completeness that malfunction probability is 0, assessment result are that transformer air-drop not will lead to zero sequence electricity False protection is flowed, transformer can be carried out and put into operation；
For parameter Deletional operation of the malfunction probability in (0,0.2) section, assessment result be transformer air-drop have compared with Small risk leads to zero-sequence current protection malfunction, can carry out transformer and put into operation；
The Deletional operation of parameter for malfunction probability in (0.2,0.7) and (0.7,1.0) section, assessment result is transformation Device air-drop has medium and high risk to lead to zero-sequence current protection malfunction, it is proposed that not carry out transformer and put into operation；
Operation for the parameter completeness that malfunction probability is 1, assessment result are that zero-sequence current protection is certain to malfunction, wind Danger reaches peak, is not available for transformer and puts into operation.
The embodiment of the present invention introduces malfunction probability level of the relay protection when shoving in face of zero sequence, for zero-sequence current The tolerance that shoves of multi-stage protective is assessed；Targetedly different parameters missing scene is considered, is shoved according to influence Each parameter completeness generated, devises the zero-sequence current protection malfunction probability method for solving under different parameter completenesses；It can Missing of the relay protection risk assessment in terms of tolerance assessment of shoving is made up, the blank of this aspect is filled up.
The present invention is from using in purpose, and in efficiency, the viewpoints such as progressive and novelty are illustrated, the practical progress having Property, oneself meets the function that Patent Law is emphasized and promotes and use important document, and more than the present invention explanation and attached drawing are only of the invention Preferred embodiment and oneself, the present invention is not limited to this, therefore, it is all constructed with the present invention, device, wait the approximations, thunder such as levy With, i.e., all according to equivalent replacement made by present patent application range or modification etc., the patent application that should all belong to of the invention is protected Within the scope of shield.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase Mutually combination.Although present invention has been a degree of descriptions, it will be apparent that, in the item for not departing from the spirit and scope of the present invention Under part, the appropriate variation of each condition can be carried out.It is appreciated that the present invention is not limited to the embodiments, and it is attributed to right and wants The range asked comprising the equivalent replacement of each factor.It will be apparent to those skilled in the art that can as described above Various other corresponding changes and deformation are made in technical solution and design, and all these change and deformation is all answered Within this is belonged to the protection scope of the claims of the invention.

Claims (10)

  1. The tolerance appraisal procedure 1. a kind of zero sequence of relay protection of power system is shoved characterized by comprising
    Complete appraisal procedure:
    According to actual operating mode, whether parameter information needed for examining risk assessment is complete；The parameter information includes switching angle Information, remanent magnetism information, method of operation information, system voltage information, line parameter circuit value information；
    If it is, into the complete step of parameter information；
    Otherwise enter parameter information deletion procedure；
    The complete step of parameter information:
    Simulation calculation is carried out according to parameter information, obtains the maximum fundamental wave peak value and damping time constant that zero sequence is shoved；
    Maximum fundamental wave peak value, damping time constant, the every section of setting time protected to be shoved using zero sequence is extrapolated and is reaching whole Zero-sequence current amplitude when fixing time；
    By the zero-sequence current amplitude extrapolated compared with setting current, the malfunction probability of every section of zero-sequence current protection is obtained；
    According to the tolerance of this section of zero-sequence current of malfunction probability assessment of every section of zero-sequence current protection；
    Parameter information deletion procedure:
    It is instead released by the setting current and setting time of every section of zero-sequence current protection and causes this section of zero-sequence current protection malfunction Zero sequence is shoved minimum basis crest value；
    It must attend the meeting according to the resulting switching angle-zero sequence of simulation calculation fundamental wave peak value relationship of shoving and cause this section of zero-sequence current protection and miss Dynamic combined floodgate section；
    Ratio is made into obtained combined floodgate section and minimum period of closing a floodgate, obtain the malfunction probability of this section of zero-sequence current protection；
    According to the tolerance of this section of zero-sequence current of malfunction probability assessment of every section of zero-sequence current protection.
  2. The tolerance appraisal procedure 2. the zero sequence of relay protection of power system according to claim 1 is shoved, feature exist In, the complete step of parameter information, specifically:
    Simulation calculation is carried out according to parameter information, obtains the maximum fundamental wave peak I that zero sequence is shoved0MWith damping time constant τ；
    The maximum fundamental wave peak I shoved using zero sequence0M, damping time constant τ, i-th section of zero-sequence current protection setting time ti Extrapolate i-th section of zero-sequence current amplitude when reaching setting timeI, n is positive integer, and 1≤i≤n, n are zero sequence electricity Flow total number of segment of protection；
    It willWith the setting current I of i-th section of zero-sequence current protection0set.iIt compares；
    IfThen the malfunction probability of i-th section of zero-sequence current protection is PWL.i=1；
    IfThen the malfunction probability of i-th section of zero-sequence current protection is PWL.i=0；
    According to the tolerance of i-th section of zero-sequence current of malfunction probability assessment of i-th section of zero-sequence current protection.
  3. The tolerance appraisal procedure 3. the zero sequence of relay protection of power system according to claim 1 is shoved, feature exist In, if switching angle loss of learning, remanent magnetism information, method of operation information, system voltage information, line parameter circuit value information it is known that if The parameter information deletion procedure, comprising:
    Single parameter information deletion procedure:
    By the zero-sequence current fundamental wave peak value under switching angles different in a cycle, corresponding switching angle-zero-sequence current is drawn out Fundamental wave peak value figure supplements the combined floodgate angle information lacked, and carries out simulation calculation on this basis, obtains zero sequence and shoves Damping time constant:Wherein L is equivalent inductance, and R is equivalent resistance；
    Utilize the setting current I of i-th section of zero-sequence current protection0set.i with setting time ti, instead release i-th section of zero-sequence current protection Zero sequence shove minimum basis crest value are as follows:
    Pass throughTo determine αiL、αiR, αiL、αiRFor adjacent two combined floodgates limiting angle, And αiL< αiR；In formula, α is switching angle, αiFor the switching angle of i-th section of zero-sequence current protection；
    Combined floodgate siding-to-siding block length ‖ αi‖ are as follows: ‖ αi‖=αiR-αiL；
    Pass through αTmin=min { αT1、αT2... }: I0M(α)=I0M(α+αT) determine that the minimum of zero-sequence current fundamental wave peak value closes a floodgate week Phase αTmin；In formula, αT1It closes a floodgate the period for T1, αT2It closes a floodgate the period for T2；
    Utilize combined floodgate siding-to-siding block length | | αi| | and minimum combined floodgate period alphaTmin, calculate the malfunction probability of i-th section of zero-sequence current protection Are as follows:
    According to the tolerance of i-th section of zero-sequence current of malfunction probability assessment of i-th section of zero-sequence current protection.
  4. The tolerance appraisal procedure 4. the zero sequence of relay protection of power system according to claim 3 is shoved, feature exist In, if switching angle loss of learning, one of remanent magnetism information, method of operation information, system voltage information, line parameter circuit value information It lacks, then the parameter information deletion procedure, further includes:
    Double parameter information deletion procedures:
    For a kind of parameter information lacked in remanent magnetism information, method of operation information, system voltage information, line parameter circuit value information A chooses the representative value of n group missing parameter information A from database；
    It is calculated using the representative value of Group X missing parameter information A as known parameter information into single parameter information deletion procedure The malfunction probability that Group X lacks the lower i-th section of zero-sequence current protection of representative value of parameter A is PWL(X).i；
    The then aggregative weighted malfunction probability of the lower i-th section of zero-sequence current protection of representative value of n group missing parameter information A are as follows:
    In formula, JXThe weight of the lower i-th section of zero-sequence current protection malfunction probability of representative value of parameter information A is lacked for Group X, it is different The weight of section zero-sequence current protection malfunction probability is identical, and
    According to the tolerance of i-th section of zero-sequence current of malfunction probability assessment of i-th section of zero-sequence current protection.
  5. The tolerance appraisal procedure 5. the zero sequence of relay protection of power system according to claim 4 is shoved, feature exist In, if switching angle loss of learning, remanent magnetism information, method of operation information, system voltage information, two kinds in line parameter circuit value information It lacks, then the parameter information deletion procedure, further includes:
    Tri-consult volume loss of learning step:
    For the two kinds of parameter informations lacked in remanent magnetism information, method of operation information, system voltage information, line parameter circuit value information A, B chooses the representative value of m group missing parameter information B from database；
    It is calculated using the representative value of Y group missing parameter information B as known parameter information into double parameter information deletion procedures Y group lacks the aggregative weighted malfunction probability of the lower i-th section of zero-sequence current protection of representative value of parameter information B are as follows:
    The then aggregative weighted malfunction probability of the lower i-th section of zero-sequence current protection of representative value of m group missing parameter information B are as follows:
    In formula, JYThe weight of the lower i-th section of zero-sequence current protection malfunction probability of representative value of parameter information B is lacked for Y group, it is different The weight of section zero-sequence current protection malfunction probability is identical, and
    According to the tolerance of i-th section of zero-sequence current of malfunction probability assessment of i-th section of zero-sequence current protection.
  6. The tolerance appraisal procedure 6. the zero sequence of relay protection of power system according to claim 1-5 is shoved, It is characterized in that, the tolerance of described this section of zero-sequence current of malfunction probability assessment according to every section of zero-sequence current protection, specifically Are as follows:
    Operation for the parameter completeness that malfunction probability is 0, assessment result are that transformer air-drop not will lead to zero-sequence current guarantor Malfunction is protected, transformer can be carried out and put into operation；
    For parameter Deletional operation of the malfunction probability in (0,0.2) section, assessment result is that transformer air-drop has smaller wind Danger leads to zero-sequence current protection malfunction, can carry out transformer and put into operation；
    The Deletional operation of parameter for malfunction probability in (0.2,0.7) and (0.7,1.0) section, assessment result are that transformer is empty Throwing has medium and high risk to lead to zero-sequence current protection malfunction, it is proposed that not carry out transformer and put into operation；
    Operation for the parameter completeness that malfunction probability is 1, assessment result are that zero-sequence current protection is certain to malfunction, and risk reaches To peak, it is not available for transformer and puts into operation.
  7. 7. a kind of zero sequence of relay protection of power system is shoved, tolerance assesses device characterized by comprising
    Complete evaluation module, is used for:
    According to actual operating mode, whether parameter information needed for examining risk assessment is complete；The parameter information includes switching angle Information, remanent magnetism information, method of operation information, system voltage information, line parameter circuit value information；
    If it is, calling the complete module of parameter information；
    Otherwise parameter information is called to lack module；
    The complete module of parameter information, is used for:
    Simulation calculation is carried out according to parameter information, obtains the maximum fundamental wave peak value and damping time constant that zero sequence is shoved；
    Maximum fundamental wave peak value, damping time constant, the every section of setting time protected to be shoved using zero sequence is extrapolated and is reaching whole Zero-sequence current amplitude when fixing time；
    By the zero-sequence current amplitude extrapolated compared with setting current, the malfunction probability of every section of zero-sequence current protection is obtained；
    According to the tolerance of this section of zero-sequence current of malfunction probability assessment of every section of zero-sequence current protection；
    Parameter information lacks module, is used for:
    It is instead released by the setting current and setting time of every section of zero-sequence current protection and causes this section of zero-sequence current protection malfunction Zero sequence is shoved minimum basis crest value；
    It must attend the meeting according to the resulting switching angle-zero sequence of simulation calculation fundamental wave peak value relationship of shoving and cause this section of zero-sequence current protection and miss Dynamic combined floodgate section；
    Ratio is made into obtained combined floodgate section and minimum period of closing a floodgate, obtain the malfunction probability of this section of zero-sequence current protection；
    According to the tolerance of this section of zero-sequence current of malfunction probability assessment of every section of zero-sequence current protection.
  8. 8. the zero sequence of relay protection of power system according to claim 7 is shoved, tolerance assesses device, and feature exists In the complete module of parameter information is used for:
    Simulation calculation is carried out according to parameter information, obtains the maximum fundamental wave peak I that zero sequence is shoved0MWith damping time constant τ；
    The maximum fundamental wave peak I shoved using zero sequence0M, damping time constant τ, i-th section of zero-sequence current protection setting time ti Extrapolate i-th section of zero-sequence current amplitude when reaching setting timeI, n is positive integer, and 1≤i≤n, n are zero sequence electricity Flow total number of segment of protection；
    It willWith the setting current I of i-th section of zero-sequence current protection0set.iIt compares；
    IfThen the malfunction probability of i-th section of zero-sequence current protection is PWL.i=1；
    IfThen the malfunction probability of i-th section of zero-sequence current protection is PWL.i=0；
    According to the tolerance of i-th section of zero-sequence current of malfunction probability assessment of i-th section of zero-sequence current protection.
  9. 9. the zero sequence of relay protection of power system according to claim 7 is shoved, tolerance assesses device, and feature exists In, if switching angle loss of learning, remanent magnetism information, method of operation information, system voltage information, line parameter circuit value information it is known that if The parameter information lacks module, comprising:
    Single parameter information lacks module, is used for:
    By the zero-sequence current fundamental wave peak value under switching angles different in a cycle, corresponding switching angle-zero-sequence current is drawn out Fundamental wave peak value figure supplements the combined floodgate angle information lacked, and carries out simulation calculation on this basis, obtains zero sequence and shoves Damping time constant:Wherein L is equivalent inductance, and R is equivalent resistance；
    Utilize the setting current I of i-th section of zero-sequence current protection0set.iWith setting time ti, anti-i-th section of zero-sequence current protection of release Zero sequence is shoved minimum basis crest value are as follows:
    Pass throughTo determine αiL、αiR, αiL、αiRFor adjacent two combined floodgates limiting angle, and αiL< αiR；In formula, α is switching angle, αiFor the switching angle of i-th section of zero-sequence current protection；
    Combined floodgate siding-to-siding block length | | αi| | are as follows: | | αi| |=αiR-αiL；
    Pass through αTmin=min { αT1、αT2... }: I0M(α)=I0M(α+αT) determine that the minimum of zero-sequence current fundamental wave peak value closes a floodgate week Phase αTmin；In formula, αT1It closes a floodgate the period for T1, αT2It closes a floodgate the period for T2；
    Utilize combined floodgate siding-to-siding block length | | αi| | and minimum combined floodgate period alphaTmin, calculate the malfunction probability of i-th section of zero-sequence current protection Are as follows:
    According to the tolerance of i-th section of zero-sequence current of malfunction probability assessment of i-th section of zero-sequence current protection.
  10. 10. the zero sequence of relay protection of power system according to claim 9 is shoved, tolerance assesses device, and feature exists In, if switching angle loss of learning, one of remanent magnetism information, method of operation information, system voltage information, line parameter circuit value information Missing, then the parameter information lacks module, further includes:
    Double parameter informations lack module, are used for:
    For a kind of parameter information lacked in remanent magnetism information, method of operation information, system voltage information, line parameter circuit value information A chooses the representative value of n group missing parameter information A from database；
    Using the representative value of Group X missing parameter information A as known parameter information, calls single parameter information to lack module, calculate The malfunction probability that Group X lacks the lower i-th section of zero-sequence current protection of representative value of parameter A is PWL(X).i；
    The then aggregative weighted malfunction probability of the lower i-th section of zero-sequence current protection of representative value of n group missing parameter information A are as follows:
    In formula, JXThe weight of the lower i-th section of zero-sequence current protection malfunction probability of representative value of parameter information A is lacked for Group X, it is different The weight of section zero-sequence current protection malfunction probability is identical, and
    According to the tolerance of i-th section of zero-sequence current of malfunction probability assessment of i-th section of zero-sequence current protection.
CN201811258261.8A 2018-10-26 2018-10-26 Method and device for evaluating zero-sequence inrush current tolerance of relay protection of power system Active CN109522615B (en)

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