CN108347039A - A kind of station domain back-up protection method and system based on jump-value of current - Google Patents
A kind of station domain back-up protection method and system based on jump-value of current Download PDFInfo
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- CN108347039A CN108347039A CN201710059890.7A CN201710059890A CN108347039A CN 108347039 A CN108347039 A CN 108347039A CN 201710059890 A CN201710059890 A CN 201710059890A CN 108347039 A CN108347039 A CN 108347039A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
Abstract
The present invention relates to a kind of station domain back-up protection method and system based on jump-value of current, includes the following steps：1) station domain back-up protection boundary condition is determined；2) determine that boundary differential area, element differential area cover the differential area of different protection domains；3) station domain back-up protection identifies abort situation according to the differential judgement of each differential area of definition, while the original main protection action situation of integrated element, topological structure of electric and breaker cut-off state and realize the high performance back-up protection of substation.The present invention provides a kind of station domain back-up protection method based on jump-value of current; it can be in fast and reliable identification station and the various types of failure of intersite line; trip zone can be extended automatically when breaker tripping; search plan based on jump-value of current can effectively shorten fault location time, greatly ensure the safety of power grid.
Description
Technical field
The present invention relates to the guard methods of intelligent substation, and in particular to a kind of station domain standby guarantor based on jump-value of current
Maintaining method and system.
Background technology
In recent years, in power grid construction spring tide, large capacity, the networking of remote super-pressure, direct current transportation, distributed new
Access, traditional protection based on information on the spot will become increasingly difficult to setting value order, and sensitivity is also unable to reach future
The requirement of power system development.
Currently, the offline off-grid of relay protection generally use, preset mode adjust protection definite value, and that protects tests
Card and check are also only for certain specific methods of operation.However, as NETWORK STRUCTURE PRESERVING POWER SYSTEM is increasingly complicated, power grid scale is not
Disconnected to expand, the method for operation is more flexible, and the existing protection based on information on the spot will be more difficult to while meet quick-action and selection
Property.It is proposed that a kind of protection scheme adapted under new situation seems particularly urgent.Traditional relay protection is mainly electric towards solving
Power device interior failure, the quantity of state that it is often transmitted just with local electric information amount and a seldom distant place are former to complete
The examination of barrier state.Traditional relay protection is just limited in the local operation conditions for only reflecting electric system by this, is lacked between each other
Weary information interaction and information sharing, trend after being cut off due to faulty equipment is shifted suddenly on a large scale and caused by serious consequence
It can not guard against.In extra-high voltage, large capacity, alternating current-direct current interconnection networking, lacks information communication between difference protection, fight separately this
Kind operating mode will bring serious security risk, increasingly cannot be satisfied the demand of various aspects.
For defect existing for traditional back-up protection, in terms of the cooperation and information sharing between protections at different levels, both at home and abroad
Scholar, expert have carried out the theory analysis of wide area relay protection in succession, and achieve certain achievement in research.By prolonged
Research and discussion, international grid meeting (CIGRE) define realization condition, function, feature of wide area protection etc..It is fixed according to this
Justice, wide area protection are concentrated mainly on following both sides research contents：First, sensu lato wide area relay protection, feature is structure
Information network transmission realizes the security and stability control to power grid under abnormal condition, referred to as special protection system using Wide-area Measurement Information
It unites (SPS)；On the other hand it is then wide area relay protection in the narrow sense, feature is to improve tradition using the information that equipment at different levels upload
Relay protection, optimization algorithm, the performance for improving protection, while simplifying the setting value order of traditional back-up protection, defencive function is become
Obtain more complete, more blocking.Wide area relay protection in the narrow sense has more realistic meaning in practical engineering application.
With the appearance of intelligent electronic device, the foundation of communication network, development, intelligent transformer substation information acquisition and processing etc.
The maturation of technology has established solid foundation for the optimization of relay protection performance, and domain protection of standing is exactly under this technical background
It is suggested.
According to existing Research foundation, the station domain of intelligent substation is protected can be divided into 2 kinds according to the processing to information：Point
It is not centralized and distributed.Centralization is to rely on communication network, and facility informations at different levels are uniformly aggregated into main website by bus
Interior, the processing mode of information is centralized processing.For the problem in distributed busbar, is protected and solved by distributed station domain.
Since station domain protection algorism SPBCD is related to a large amount of upload informations, how in loss of learning or the nonsynchronous feelings of information
Ensure the validity and accuracy of data parameters under condition, it is therefore necessary to study one kind and make full use of redundancy and fault freedom
High station domain protection scheme.
There are many deficiencies for traditional staged back-up protection such as：It is caused to ensure that the selectivity of protection sacrifices quick-break
Action delay is longer, the superior and the subordinate's route protection setting value order is difficult, sensitivity is insufficient, is in addition to this also easy to that malfunction is caused to cause
The accidents such as a wide range of cascading trip.
Invention content
To solve above-mentioned deficiency of the prior art, the object of the present invention is to provide a kind of station domain based on jump-value of current
Back-up protection method, the present invention, by carrying out subregion to protection domain, are based on jump-value of current in the domain back-up protection scheme of station
The thinking for making differential comparison has studied the station domain back-up protection new principle of intelligent substation, and how to realize the skills such as fault location
Art finally proposes a kind of new station domain back-up protection scheme (SPBCV) based on jump-value of current, improves intelligent substation
Protective value.
The purpose of the present invention is what is realized using following technical proposals：
The present invention provides a kind of station domain back-up protection method based on jump-value of current, it is improved in that the side
Method includes the following steps：
1) station domain back-up protection boundary condition is determined；
2) determine that boundary differential area, element differential area cover the differential area of different protection domains；
3) station domain back-up protection identifies abort situation according to the differential judgement of each differential area of definition, while integrating member
The original main protection action situation of part, topological structure of electric and breaker cut-off state and realize the high performance back-up protection of substation.
Further, in the step 1), domain back-up protection of standing is divided into according to the processing of information：Centralization and distribution
Formula；The centralization is to rely on communication network, facility informations at different levels is uniformly aggregated into main website by bus, the processing of information
Mode is centralized processing；For the problem in distributed busbar, solved by distributed station domain back-up protection；
Domain back-up protection of standing is towards the back-up protection comprising transformer and busbar important equipment in station, is a kind of same higher level
Wide area protection coordinates the back-up protection towards its inlet-outlet line, domain back-up protection boundary condition of standing to be to transmit electricity with all disengaging of substation
The offside breaker of line is boundary, is no more than the range of offside breaker.
Further, in the step 2), boundary differential area is the boundary of station domain back-up protection, reflection station domain back-up protection
Maximum protection range, using inlet-outlet line offside breaker as boundary demarcation；Element differential area with its within the scope of relevant device certain
Element main protection range is identical, to cooperate with main protection range；It should be noted that main protection is still in intelligent substation
Independent duplicate system retrofit is so used, the main protection range of each element is strictly defined as element itself, if certain element main protection
Range has overlapping region with the main protection range of other elements, the case where by false protection is susceptible to.
Further, the step 3) includes the following steps：
A, fault identification and fault initiating is carried out；
B, fault location.
Further, the step A includes the following steps：
A, the current information that all current transformer transmission come is acquired；
B, differential to boundary to carry out differential judgement；
C, judge whether that station internal fault occurs, after being determined as station internal fault, start to search element differential area progress failure
Suo Dingwei；Otherwise return to step a.
Further, in the step b, differential judgement is carried out by the way that following formula are differential to boundary, it is differential to solve boundary
The jump-value of current in area：
Δidff(k)=| | idff(k)-idff(k-N)|-|idff(k-N)-idff(k-2N)||
Wherein：Δidff(k) it is the jump-value of current of boundary differential area；idff(k) it is the difference current of boundary differential area；N
For the sampling number of each cycle, so idff(k-N) difference current being calculated at the N number of sampled point of kth-, i are indicateddff(k-
2N) indicate the difference current being calculated at -2N sampled points of kth；K is real-time sampling point.
Further, in the step c, whether station domain more than threshold value is used as by the jump-value of current of boundary differential area
The start-up criterion of back-up protection internal fault.The map of current variable of boundary differential area and the threshold setting valve being set are carried out
Compare, as Δ idff(k) ＞ isetWhen, when continuous multi-point sampling meets above formula, then judge that station internal fault occurs, it is fixed into failure
Position；In break down or stand outside the protection domain of back-up protection in station when normal operation, it will be unsatisfactory for above formula, this
When will be latched substation in all elements protection；Rounding definite value iset=0.2IN, INFor rated current.
Further, the step B includes the following steps：
1. the jump-value of current for calculating all boundary differential areas is gone forward side by side, row major grade divides；
2. priority parameters initialize N '=1；
3. be N ' to priority being that the corresponding element differential area of breaker judges；
4. judging whether counter element differential area breaks down, if so, excision fault element；Otherwise return to step is 2.；
5. going to step A.
Further, the step 4. in, inside substation, breaker only connects two elements；Difference current is dashed forward
The maximum breaker of variable is chosen to be doubtful breaker, and two adjacent element differential areas are done with the judgement of difference current respectively,
When this breaker is judged to not breaking down, continues steering and judge next element differential area；
Meanwhile the breaker that outlet is connected with external system is defined as boundary breaker, in the domain protection domain of station only
Be connected with boundary breaker there are one element, when the jump-value of current of boundary breaker ranked first in the ranking, then only with pair
This boundary breaker carries out breakdown judge；By the way that failure member can be found to the comparison of element differential area difference current Sudden Changing Rate
Part.
The present invention also provides a kind of station domain backup protection system for damping based on jump-value of current, it is improved in that described
System includes：
Boundary condition determining module：For determining domain back-up protection boundary condition of standing；
Boundary differential area determining module：For determining that boundary differential area, element differential area cover the difference of different protection domains
Dynamic area；
Back-up protection module：Domain back-up protection of standing identifies fault bit according to the differential judgement of each differential area of definition
It sets, while the original main protection action situation of integrated element, topological structure of electric and breaker cut-off state for realizing substation
High performance back-up protection.
Compared with the immediate prior art, the excellent effect that technical solution provided by the invention has is：
Station domain back-up protection method provided by the invention based on jump-value of current by introduce new-style electronic mutual inductor,
Intelligent electronic equipment IED, combining unit MU establish the new technologies such as the communication network for information transmission and use IEC
61850 communication protocol standards incorporate the functions such as the acquisition, transmission, modeling of information in the construction of intelligent substation.The present invention exists
In the station domain back-up protection scheme of SPBCD, by carrying out subregion to protection domain, make the think of of differential comparison based on jump-value of current
Road has studied the station domain back-up protection new principle of intelligent substation, and how to realize the technologies such as fault location, finally proposes
A kind of new station domain back-up protection scheme (SPBCV) based on jump-value of current, improves the protective value of intelligent substation.
The present invention surrounds the station domain back-up protection principle suitable for intelligent substation and realizes that technology is furtherd investigate, and carries
Go out the station domain protection scheme based on jump-value of current, can reach following effect compared to traditional protection scheme：
(1) this programme is using foundation of the jump-value of current as fault location for flowing through each equipment and circuit, for failure
It is happened in area or does not need to distinguish on inlet-outlet line, and the outlet failure of large-scale substation is considered as interior element event of standing
Barrier screens processing, and for this method when applied to extensive substation, it is fast to give full play to fault location speed, identification essence
Spend high clear superiority.
(2) it is used as the supplement of unbalanced fault by the assembled scheme for combining delay confirmation and negative-sequence current differential principle
Criterion, for single-phase fault, the unbalanced faults such as phase-to phase fault, this scheme can accurately identify, high sensitivity.
(3) using the zero sequence current differential protection principle with delay confirmation as various earth faults occur in solidly grounded system
Supplement criterion, substantially increase the sensitivity through being protected under transition resistance eutral grounding fault condition.
(4) it uses in conjunction with stable state differential current principle, negative-sequence current differential principle and zero sequence current differential protection principle
Comprehensive criterion, for various unbalanced faults, judgement that can be rapidly and accurately.
Description of the drawings
Fig. 1 is typical case 220kV substations provided by the invention and its adjacent substations wiring schematic diagram；
Fig. 2 is fault initiating program flow diagram provided by the invention；
Fig. 3 is fault locating program flow chart provided by the invention；
Fig. 4 is the flow chart of the station domain back-up protection method provided by the invention based on jump-value of current.
Specific implementation mode
The specific implementation mode of the present invention is described in further detail below in conjunction with the accompanying drawings.
The following description and drawings fully show specific embodiments of the present invention, to enable those skilled in the art to
Put into practice them.Other embodiments may include structure, logic, it is electrical, process and other change.Embodiment
Only represent possible variation.Unless explicitly requested, otherwise individual component and function are optional, and the sequence operated can be with
Variation.The part of some embodiments and feature can be included in or replace part and the feature of other embodiments.This hair
The range of bright embodiment includes equivalent obtained by the entire scope of claims and all of claims
Object.Herein, these embodiments of the invention can individually or generally be indicated that this is only with term " invention "
For convenience, it and if in fact disclosing the invention more than one, is not meant to automatically limit ranging from appointing for the application
What single invention or inventive concept.
Embodiment one
The present invention provides a kind of station domain back-up protection method based on jump-value of current, and flow chart is as shown in figure 4, include
Following step：
1) station domain back-up protection boundary condition is determined；
In station domain back-up protection scheme based on jump-value of current, concept and the protection of station domain of the protection of station domain are elaborated first
Realization condition.Domain protection of standing is the maturation in intelligent electronic device, and the foundation of communication network and intelligent transformer substation information are adopted
It is proposed under the technologies development such as collection and processing, it can be divided into 2 kinds according to the processing to information：Be respectively centralization and
It is distributed.Centralization is to rely on communication network, facility informations at different levels is uniformly aggregated into main website by bus, the processing of information
Mode is centralized processing.For the problem in distributed busbar, is protected and solved by distributed station domain.
Domain back-up protection of standing is mainly towards the back-up protection for including the important equipments such as transformer and busbar in station, is a kind of
Coordinate the back-up protection towards its inlet-outlet line with higher level's wide area protection, the range by domain protection of standing is defined as with the substation accordingly
The offside breaker of all disengaging power transmission lines is boundary, is no more than the range of offside breaker.
2) determine that boundary differential area, element differential area cover the differential area of different protection domains；
Region within the jurisdiction is specifically divided into following 2 class differential area in SPBCV schemes according to protection domain：Boundary differential area
With element differential area.Wherein, in the transformer station model being had determined at one, the range of boundary differential area and element differential area is drawn
It point is all to determine.Boundary differential area is the boundary of SPBCV, reflects the maximum protection range of station domain back-up protection, with disengaging
Line offside breaker is boundary demarcation；And element differential area is identical as the main protection range of relevant device within the scope of its, convenient for and
Main protection cooperates.
3) station domain back-up protection identifies abort situation according to the differential judgement of each differential area of definition, while integrating member
The original main protection action situation of part, topological structure of electric and breaker cut-off state and realize the high performance back-up protection of substation.
The current information transmitted using corresponding mutual inductor come determine whether occur troubles inside the sample space, by formula
Δidff(k)=| | idff(k)-idff(k-N)|-|idff(k-N)-idff(k-2N) | | ask the differential of boundary differential area
The variable quantity of electric current, by Δ idff＞ isetBy the difference current knots modification of boundary differential area and the threshold setting valve that has been set into
Row compares.When continuous multi-point sampling meets above formula, judgement failure is happened at internal system, is transferred to fault initiating program therewith,
Proceed by troubleshooting；In break down or stand outside the protection domain in SPBCV when normal operation, it will be unsatisfactory for above
Formula will be latched the protection of all elements in substation at this time.Whether it is more than by the difference current variable quantity of boundary differential area
Start-up criterion of the threshold value as SPBCV internal faults.It can be with rounding definite value iset=0.2IN, INFor rated current；Wherein：Δ
idff(k) it is the jump-value of current of boundary differential area；idff(k) it is the difference current of boundary differential area；N is the sampling of each cycle
Points, so idff(k-N) difference current being calculated at the N number of sampled point of kth-, i are indicateddff(k-2N) kth -2N is indicated
The difference current being calculated at sampled point；K is real-time sampling point.
After being determined as station internal fault, start to carry out fault search positioning to element differential area.Inside general substation, break
Road device all only connects two elements.The maximum breaker of difference current Sudden Changing Rate is chosen to be doubtful breaker, then to adjacent
Two element differential areas do the judgement of difference current respectively and continue to turn to when this breaker is judged to not breaking down
Judge next element differential area.Meanwhile the breaker that outlet is connected with external system is defined as boundary breaker, due to standing
Only it is connected with boundary breaker there are one element in the protection domain of domain, so the jump-value of current when the breaker is arranged in the ranking
When first, then only breakdown judge is carried out with to the element.By that can look for the comparison of element differential area difference current Sudden Changing Rate
To fault element.
Based on same inventive concept, the present invention also provides a kind of station domain backup protection system for damping based on jump-value of current,
Including：
Boundary condition determining module：For determining domain back-up protection boundary condition of standing；
Boundary differential area determining module：For determining that boundary differential area, element differential area cover the difference of different protection domains
Dynamic area；
Back-up protection module：Domain back-up protection of standing identifies fault bit according to the differential judgement of each differential area of definition
It sets, while the original main protection action situation of integrated element, topological structure of electric and breaker cut-off state for realizing substation
High performance back-up protection.
This programme does not need pair according to primary basis for estimation of the jump-value of current size order as failure within the scope of the domain of station
The failure stood on internal fault and inlet-outlet line distinguishes, and the outlet failure of large-scale substation is considered as interior element fault of standing
Examination is handled, and for this method for sweeping substation, the fault search time can be obviously shortened by having, and be accurately positioned to event
Hinder the advantage of element.
Embodiment two
Hereinafter reference will be made to the drawings more specifically describes the present invention.
By taking typical 220kV substations and adjacent substations connection line as an example, illustrate the overall plan of SPBCV, such as Fig. 1 institutes
Show.In the range of domain of standing is protected, substation mainly has 2 tri- coil transformers of 220kV/110kV/35kV, L1~L7 circuits to be
Coupled substation's inlet-outlet line, G1~G6, Loadl~Load4, CB01~CB25 are respectively equivalent source, load, open circuit
Device, Bus01~Bus06 belongs to 3 different voltages grades in substation, and Bus07~Bus13 is in all adjacent substations
Busbar.
First, the entire protection zones SPBCV are divided into 2 class differential areas according to the difference of protection domain：Boundary differential area and
Element differential area.Wherein, after transformer station model is selected, whether boundary differential area or element differential area, their stroke
Point range is fixed.
Boundary differential area choose flow through all inlet-outlet line opposite ends of this substation breaker (CB06, CB07, CB10, CB11,
CB15, CB16, CB20, CB22, CB24, CB25) electric current be based on Kirchhoff's current law (KCL) carry out differential operational, differential range
That is region A in Fig. 1.
The coverage area of element differential area is identical as the coverage area of differential main protection of the element, and transformer T1's is differential
Calculate the electric current chosen and flow through breaker CB04, CB12, CB18 (being respectively positioned on the D of region).The selection of other elements differential area with
It is similar, all element differential areas in the exemplary substation in figure are as shown in the table.
In the present invention program, the positioning of intelligent substation internal fault is divided into two parts, and first part is that fault initiating is sentenced
Stop journey, and second part is fault location flow.Fig. 2 show fault initiating and judges flow, collects all bound currents first
Then information carries out differential calculating to the electric current in the differential area of boundary, then can be with when its difference current Sudden Changing Rate is less than setting valve
Judgement is not broken down in station, protection in locking station；When the difference current Sudden Changing Rate of boundary differential area is discontented less than setting valve
When sufficient fault condition judgement, startup separator finder, steering component differential area carries out fault search, as shown in Figure 3.
Inside general substation, in order to avoid excessively complicated cumbersome, breaker all only connects two elements.According to differential electricity
Stream calculation defines other breaker priority of the highest priority (N=1) of some breaker and is waited and so on for N=2,3,4,
First using the breaker of highest priority as target breaker, element differential area (non-boundary breaker that then it is participated in
There are two element differential areas) carry out differential calculating.Meanwhile the breaker that outlet is connected with external system is defined as boundary open circuit
Device, due to being only involved in the differential protection judgement of an element, the other side in the station domain protection domain inner boundary breaker defined
It is not considered for the protection domain of adjacent substations, so the difference current Sudden Changing Rate at the breaker of boundary reaches maximum value
When, it is only necessary to differential calculating is implemented to the element differential area of this side.
In general, the breaker of highest priority can be fault element or be connected with fault element, therefore only need
Differential calculating is done to the corresponding element differential area of the breaker of highest priority and is assured that fault element.If element
Itself leads to leakage current occur since insulating capacity decline occur in high voltage, ageing equipment, this just brings interference to calculating,
At this point, the adjacent element of the breaker of highest priority can not be determined as fault element.It at this moment can be the low level-one of priority
Breaker be set as target breaker, the then repeatedly differential calculating of front.Leakage current is to difference current in actual conditions
Calculating influence be not it is very serious, it is general need to only arrange priority the corresponding differential area of preceding two breakers and do failure sentence
It Ji not can recognize that failure, and then the corresponding breaker of tripping.
This programme judges according to each circuit breaker current Sudden Changing Rate size order is flowed through within the scope of the domain of station as the primary of failure
Foundation need not distinguish the failure on station internal fault and inlet-outlet line, and the outlet failure of large-scale substation is considered as
Element fault is handled to screen in standing, and this method can be obviously shortened the fault search time for sweeping substation, accurate
Really navigate to the advantage of fault element.
SPBCV assigns trip signal interval t1Afterwards if element differential protection does not return, then it is assumed that breaker tripping, at this time
Current differential area is extended by SPBCV, and the breaker on extension trip zone retransmits trip command, until failure vanishes.
Whether failure can integrate following information to detection breaker is judged：Whether SPBCV has been sent from the breaker
Trip command, whether fault element differential area persistently have difference current, and whether the breaker of fault element persistently has electric current,
Whether the breaker of fault element is located at trip position.
It, will be with the difference by the element differential area where searching failure breaker when the failure of breaker failure occurs
Other adjacent normal circuit breakers of failure breaker are also included in into dynamic area, form an extension trip zone, with normal
Breaker replaces failure breaker.As shown in the table, it is each breaker of substation and adjacent breaker in SPBCV protection schemes
Corresponding extension tripping area.
The current differential algorithm of this programme is described below：
The operation equation of differential judgement
It is reference with A phases, difference current is the phasor and I of each branch currentdiff·A, stalling current takes all
The half I of the scalar sum of road electric currentres·A, value is respectively In formula, k2、…knTo be used to eliminate due to each side of transformer
Inconsistent, tap_changing of rated current etc. influences and the coefficient of balance that introduces, coefficient of balance can by transformer capacity and
Each side rated current is calculated：k2=Ie1/Ie2、…kn=Ie1/Ien, wherein Ie1、Ie2、…IenFor each side rated current, if
Operation, as a rated current are participated in primary current value, if participating in operation, as secondary specified electricity with secondary current value
Stream.Take coefficient of balance i.e. I on the basis of high voltage side of transformere1.B phases, C phases and A are similar.According to the rules, obtaining current is referred to by busbar
Be positive direction to circuit, can accomplish in the use of current transformer match uniformly in this way with main protection, and so on transformation
It is positive direction that each side circuit breaker current of device, which takes inflow transformer, and reference side value is arrived in unified conversion.Therefore, SPBCV is being carried out not
When differential criterion in co-extensive calculates, it should suitably be adjusted before various middle electric current phasor according to unified positive direction regulation
Sign.
For the sake of unification, in formulaTake the A phase currents in each branch are unified to be rolled over by the lateral Δ sides Y
The phasor after reference side is calculated, below by taking -11 wiring of Y/ Δs as an example, the convert formula of each phase current is:
To improve the sensitivity of reflection unbalanced fault, SPBCV is made using the negative-sequence current differential principle with delay confirmation
For the supplement criterion of unbalanced fault.The purpose of band delay confirmation is uneven in short-term electric caused by when escaping breaker three-phase difference
Stream.The differential ratio-restrained characteristic of negative-sequence current is similar with stable state differential current characteristic, and corresponding difference current is
Stalling current isIn formula
For via each branch negative-sequence current phasor after the lateral Δ side conversions of Y.
When course of emergency crosses the failure of resistance eutral grounding, SPBCV is made using the zero sequence current differential protection principle with delay confirmation
Its sensitivity is improved to occur the supplement criterion of various earth faults in solidly grounded system.Not due to breaker three-phase
Very short out-of-balance current is easy tod produce when synchronous, in order to eliminate this influence, the step for being provided with delay confirmation.Zero
The ratio-restrained characteristic of sequence current differential is similar with stable state differential current characteristic, and corresponding difference current is
Corresponding stalling current isIn formula
For corresponding zero-sequence current phasor.
When three-phase shortcircuit, band transition resistance failure and other unbalanced faults occurs, since SPBCV schemes synthesis is adopted
It is former with differential stable state differential current principle, negative-sequence current differential principle and zero sequence current differential protection is made with jump-value of current
Reason, can preferably differentiate the above failure.
The station domain back-up protection scheme based on jump-value of current that the present invention provides a kind of, can be in fast and reliable identification station
And the various types of failure of intersite line, trip zone can be extended automatically when breaker tripping, be based on jump-value of current
Search plan can effectively shorten fault location time, greatly ensure the safety of power grid.
The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, although with reference to above-described embodiment pair
The present invention is described in detail, those of ordinary skill in the art still can to the present invention specific implementation mode into
Row modification either equivalent replacement these without departing from any modification of spirit and scope of the invention or equivalent replacement, applying
Within the claims of the pending present invention.
Claims (10)
1. a kind of station domain back-up protection method based on jump-value of current, which is characterized in that the method includes following step：
1) station domain back-up protection boundary condition is determined；
2) determine that boundary differential area, element differential area cover the differential area of different protection domains；
3) station domain back-up protection identifies abort situation according to the differential judgement of each differential area of definition, while integrated element is former
There are main protection action situation, topological structure of electric and breaker to cut-off state and realizes the high performance back-up protection of substation.
2. station domain back-up protection method as described in claim 1, which is characterized in that in the step 1), domain back-up protection of standing
It is divided into according to the processing of information：It is centralized and distributed；The centralization is to rely on communication network, and facility informations at different levels are led to
It crosses bus to be uniformly aggregated into main website, the processing mode of information is centralized processing；For the problem in distributed busbar, by
Distributed station domain back-up protection solves；
Domain back-up protection of standing is towards the back-up protection comprising transformer and busbar important equipment in station, is a kind of same higher level's wide area
Back-up protection of the protection cooperation towards its inlet-outlet line, domain back-up protection boundary condition of standing are with all disengaging power transmission lines of substation
Offside breaker is boundary, is no more than the range of offside breaker.
3. station domain back-up protection method as described in claim 1, which is characterized in that in the step 2), boundary differential area is
It stands the boundary of domain back-up protection, the maximum protection range of reflection station domain back-up protection is drawn by boundary of inlet-outlet line offside breaker
Point；Element differential area is identical as certain element main protection range of relevant device within the scope of its, so as to main protection range phase interworking
It closes；It should be noted that main protection still uses independent duplicate system retrofit, the main protection range of each element in intelligent substation
It is strictly defined as element itself, it, will if certain element main protection range has overlapping region with the main protection range of other elements
The case where being susceptible to false protection.
4. station domain back-up protection method as described in claim 1, which is characterized in that the step 3) includes the following steps：
A, fault identification and fault initiating is carried out；
B, fault location.
5. station domain back-up protection method as claimed in claim 4, which is characterized in that the step A includes the following steps：
A, the current information that all current transformer transmission come is acquired；
B, differential to boundary to carry out differential judgement；
C, judge whether that station internal fault occurs, after being determined as station internal fault, it is fixed to element differential area progress fault search to start
Position；Otherwise return to step a.
6. station domain back-up protection method as claimed in claim 5, which is characterized in that in the step b, pass through following formula pair
Boundary is differential to carry out differential judgement, solves the jump-value of current of boundary differential area：
Δidff(k)=| | idff(k)-idff(k-N)|-|idff(k-N)-idff(k-2N)||
Wherein：Δidff(k) it is the jump-value of current of boundary differential area；idff(k) it is the difference current of boundary differential area；N is every
The sampling number of a cycle, so idff(k-N) difference current being calculated at the N number of sampled point of kth-, i are indicateddff(k-2N)
Indicate the difference current being calculated at -2N sampled points of kth；K is real-time sampling point.
7. station domain back-up protection method as claimed in claim 5, which is characterized in that in the step c, pass through boundary differential area
Jump-value of current whether be more than threshold value as stand domain back-up protection internal fault start-up criterion.By the electricity of boundary differential area
Flow graph variable is compared with the threshold setting valve being set, as Δ idff(k) ＞ isetWhen, when in continuous multi-point sampling satisfaction
When formula, then judge that station internal fault occurs, into fault location；When breaking down outside the protection domain of back-up protection in station or
In standing when normal operation, it will be unsatisfactory for above formula, the protection of all elements in substation will be latched at this time；Rounding definite value iset
=0.2IN, INFor rated current.
8. station domain back-up protection method as claimed in claim 4, which is characterized in that the step B includes the following steps：
1. the jump-value of current for calculating all boundary differential areas is gone forward side by side, row major grade divides；
2. priority parameters initialize N '=1；
3. be N ' to priority being that the corresponding element differential area of breaker judges；
4. judging whether counter element differential area breaks down, if so, excision fault element；Otherwise return to step is 2.；
5. going to step A.
9. as claimed in claim 8 station domain back-up protection method, which is characterized in that the step 4. in, inside substation,
Breaker only connects two elements；The maximum breaker of difference current Sudden Changing Rate is chosen to be doubtful breaker, to adjacent two
The judgement of difference current is done in a element differential area respectively, when this breaker is judged to not breaking down, continues to turn to judgement
Next element differential area；
Meanwhile the breaker that outlet is connected with external system is defined as boundary breaker, only one in the domain protection domain of station
A element is connected with boundary breaker, when the jump-value of current of boundary breaker ranked first in the ranking, then only with to this side
Boundary's breaker carries out breakdown judge；By the way that fault element can be found to the comparison of element differential area difference current Sudden Changing Rate.
10. a kind of station domain backup protection system for damping based on jump-value of current, which is characterized in that the system comprises：
Boundary condition determining module：For determining domain back-up protection boundary condition of standing；
Boundary differential area determining module：For determining that boundary differential area, element differential area cover the differential area of different protection domains；
Back-up protection module：Domain back-up protection of standing identifies abort situation according to the differential judgement of each differential area of definition, together
When integrated element original main protection action situation, topological structure of electric and breaker cut-off state for realizing substation's high-performance
Back-up protection.
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| CN109387742A (en) * | 2018-11-06 | 2019-02-26 | 华中科技大学 | A kind of line fault recognition methods based on multiple spot active power monitoring and difference |
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| CN110829352A (en) * | 2019-11-26 | 2020-02-21 | 国电南瑞科技股份有限公司 | Multi-principle time division sequence fault identification and control method and device in stability control system |
| CN110912089A (en) * | 2019-11-26 | 2020-03-24 | 华北电力大学 | Flexible direct-current power distribution system protection method based on local current mutation quantity polarity |
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