CN107425511A - A kind of wide area backup protection method based on the matching of subregion weighted failure - Google Patents
A kind of wide area backup protection method based on the matching of subregion weighted failure Download PDFInfo
- Publication number
- CN107425511A CN107425511A CN201710545951.0A CN201710545951A CN107425511A CN 107425511 A CN107425511 A CN 107425511A CN 201710545951 A CN201710545951 A CN 201710545951A CN 107425511 A CN107425511 A CN 107425511A
- Authority
- CN
- China
- Prior art keywords
- circuit
- protection
- failure
- mrow
- section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
Abstract
The invention discloses a kind of wide area backup protection method based on the matching of subregion weighted failure, comprise the following steps：(1) selecting both ends, at least one protects the circuit started and its adjacent lines as suspected malfunctions circuit Li；(2) by circuit LiIt is divided into m section, the expectation protection vector of construction k-th of section of circuit；(3) construct and collect circuit LiReal protection vector Pi, the section weighted failure matching degree between the real protection vector of circuit and the expectation protection vector of m section is calculated, takes wherein Trouble Match degree M of the maximum as the circuiti；(5) failure criterion is constructed, if meeting failure criterion, it is judged for faulty line, if be unsatisfactory for, judges whether to have traveled through all suspected malfunctions circuits, if it is, exit, otherwise repeat step (1) step (4).The Trouble Match degree for the circuit that the present invention constructs can more accurately reflect the fault degree of circuit, and the accuracy of fault detect is high, and fault-tolerance is higher.
Description
Technical field
The present invention relates to a kind of power network wide area backup protection method, more particularly to it is a kind of based on the matching of subregion weighted failure
Wide area backup protection method.
Background technology
As Power System Interconnection scale increases, system architecture and the method for operation become more sophisticated；Tradition based on local signal
Protection can not ensure the safe operation of power network very well；Domestic and international multiple large-scale blackout, especially beautiful to add 8.14 to have a power failure on a large scale, table
Bright traditional back-up protection adjusts after the excision of bad, heavy load circuit power flow transfer and causes the upper distance of the latter to adjacent regular link
III section of false protection, cascade tripping is formed, and then had a power failure on a large scale；Wide area backup protection based on wide-area communication network is fast online
Speed accurately detects that electric network fault element turns into an important research direction；It is characterized in by wide-area communication network, collects phase
The redundancy of each conventional wave protection element in adjacent associated domain, fault element is completed before traditional back-up protection operation time limit
Accurate detection and quick excision；Without traditional back-up protection time coordination, regular link is avoided because protection seting is improper or mistake
Load is cut by mistake, so as to prevent the expansion of fault coverage.
Domestic more than 220kV has dual protection, but under traditional main protection tripping small probability event, by protection seting not
Properly, overload etc. may cause the nearly standby or remote back-up protection malfunction and tripping of regular link；Although current high speed wide area
The real-time and Reliability Assurance of communication network complete Wide-area Measurement Information transmission in 0.5s, but may still go out in communication process
Now a small amount of information is lost, distorted；Therefore it is required that wide area backup protection method must possess high fault tolerance, can just be faster than and better than biography
System back-up protection；Domestic and foreign scholars researcher's system, Bayesian network, protection entropy, based on the vertical of conservation of energy principle
The wide area backup protection fault detection method such as differential protection, information fusion, incidence matrix；Such as Li Zhenxing etc. proposes a kind of establish
The fitness function model of Multi-information acquisition, it is each in reflecting regional using the logical relation between the redundancy of information and protection
The probability of malfunction of transmission line of electricity；But every circuit is directed to, fitness value during its normal work is only provided, does not consider circuit
Fitness value when middle different sections break down, the fault-tolerance of method receive influence；Li Yimeng etc. proposes a kind of towards accident
The continuous diagnostic method of dynamic of evolution, using protection act export signal, by line fault be defined as " self-supporting pattern ",
" failure mode ", " far-end mode " Three models carry out fault diagnosis；But should in the case of for multi-bit information loss or mistake
The fault-tolerance of diagnostic method is not high；It is existing only to be provided in certain line fault based on the wide area backup protection method of pattern match
One protection desired value, not enough accurately, corresponding wide area protection it is expected to open when not accounting for the diverse location failure of circuit
The difference of dynamic value；Do not account for faulty line, there is multidigit relay fail and malfunction in its adjacent regular link and distortion when, can make
Normally with the failure degree of faulty line is close, traditional protection may adjust mismatch etc., therefore based on single protection desired value
The situation of the incorrect identification of faulty line occurs in method for mode matching.
The content of the invention
The present invention provides the wide area backup protection that a kind of fault-tolerance is high, identification root is accurately based on the matching of subregion weighted failure
Method.
The technical solution adopted by the present invention is：A kind of wide area backup protection method based on the matching of subregion weighted failure, bag
Include following steps：
(1) selecting both ends, at least one protects the circuit started and its adjacent lines as suspected malfunctions circuit Li(i=
1,2 ... n)；
(2) by suspected malfunctions circuit LiM section is divided into, the initiation value accordingly protected when distinguishing failure according to each section
And direction protection component synthesis value D, construction circuit LiSection when k-th of section breaks down it is expected to protect vectorial Pi k；
(3) suspected malfunctions circuit L is collectediThis side and the protection initiation value of offside and adjacent each circuit, construction circuit LiReality
Protect vectorial P in borderi；
(4) circuit L is calculatediPiSection weighted failure matching degree between each expectation protection vector of m section, takes
Wherein Trouble Match degree M of the maximum as the circuiti；
(5) failure criterion is built, if certain circuit meets failure criterion, judges it for faulty line；If it is unsatisfactory for
Failure criterion, then judge whether to have traveled through all suspected malfunctions circuit Li, if it is, exit, otherwise, repeat step (1)-step
Suddenly (4).
Further, the direction protection component synthesis value D：
For other each protection elements, generation action duration is 1, motionless to be used as 0.
Further, the section weighted failure matching degree of the circuitComputational methods it is as follows：
In formula：Represent suspected malfunctions circuit LiReal protection vector PiWhen being broken down with k-th of section of the circuit
Expectation protect vectorial Pi kBetween section weighted failure matching degree；
NiRepresent real protection vector PiDimension；
PijRepresent real protection vector PiIn j-th of element；
Represent that k-th of section it is expected to protect vectorial Pi kIn j-th of element；
Ti kRepresent suspected malfunctions circuit LiK-th of section L when breaking downiEach wide area protection in both ends it is expected working value
Weight sum；
ωjRepresent the weight coefficient of each wide area protection；
Suspected malfunctions circuit L is re-definediTrouble Match degree, i.e. line taking road LiReal protection vector PiWith m section
Expectation protect vector between each section weighted failure matching degree in maximum, as circuit LiTrouble Match degree Mi, calculate
Method is as follows：
According to above formula, from circuit LiM section weighted failure matching degree in, obtain circuit LiTrouble Match degree Mi。
Further, the failure criterion is as follows：
That is, as suspected malfunctions circuit LiFailure degree MiThan its all adjacent lines LkFailure degree MkIt is all big, and MiWith Mk
Difference be both greater than 0.15, and MiMore than failure degree threshold value Mset, then L is judgediFor faulty line.
Further, in addition to following failure criterion：
In formula：pj,LiFor suspected malfunctions circuit LiReal protection vector in j-th protection element；Represent doubtful event
Hinder circuit LiThe protection element number sum that both sides have been turned on,Represent suspected malfunctions circuit LkThe protection that both sides have been turned on
Component number sum；
I.e.：As suspected malfunctions circuit LiFailure degree MiThan its all adjacent lines LkFailure degree MkIt is all big, and doubtful event
Hinder circuit LiFailure degree MiCircuit L adjacent theretokFailure degree MkDifference be less than 0.15, and MiMore than failure degree threshold value Mset,
And LiBoth sides have been turned on protection element number sum and are more than LkBoth sides have been turned on protection element number sum, then judge LiFor failure
Circuit.
Further, in addition to following failure criterion：
I.e.：As suspected malfunctions circuit LiFailure degree MiLess than failure degree threshold value Mset, and it is more than the second fault threshold Mset2,
And all adjacent lines LkFailure degree MkBoth less than Mset2When, then judge LiFor faulty line.
Further, circuit is respectively protected used by the step (2) principle and its to this circuit with it is next
The protection domain of level adjacent lines, by certain suspected malfunctions circuit LiBe divided into 5 sections, i.e., from sending end to receiving end every
20% is divided into a section.
The beneficial effects of the invention are as follows：
(1) the subregion weighted failure adaptation function of the invention by constructing each section of circuit, the expectation for passing through each section are protected
Shield vector, then the real protection vector of certain circuit is inputted, the Trouble Match degree of each section is obtained, and then obtain the failure of circuit
With degree；
(2) present invention is by protecting vector to be weighted failure with the expectation of each section by every circuit real protection is vectorial
Matching, obtain every circuit more accurately matching degree so that the matching degree of suspected malfunctions circuit preferably reflects its fault degree；
In the case of protection mismatch, relay fail and the malfunction that length cooperation of line protection difficulty and overload trigger, it is accurate to remain to
Detect faulty line；
(3) present invention considers multidigit relay fail on suspected malfunctions circuit, multidigit protection misses on certain adjacent regular link
Dynamic, normally the extreme case close with faulty line matching degree, establishes three failure criterions, improves the fault-tolerance of this method.
Brief description of the drawings
Fig. 1 is schematic flow sheet of the present invention.
Fig. 2 is partition model schematic diagram in the embodiment of the present invention.
Fig. 3 is partial electric grid structure and failure partition model in IEEE14 node systems.
Embodiment
The present invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of wide area backup protection method based on the matching of subregion weighted failure, comprises the following steps：
(1) selecting both ends, at least one protects the circuit started and its adjacent lines as suspected malfunctions circuit Li(i=
1,2 ... n)；
(2) by suspected malfunctions circuit LiM section is divided into, the initiation value accordingly protected when distinguishing failure according to each section
And direction protection component synthesis value D, construction circuit LiSection when k-th of section breaks down it is expected to protect vectorial Pi k；
The principle of each protection is used and its to this circuit and the protection domain of next stage adjacent lines according to certain circuit, will
Suspected malfunctions circuit Li5 sections are divided into, section when k-th of section of the circuit breaks down is constructed and it is expected to protect vector
Pi k；The division rule of five sections is：Using the protection element enabling signal of every circuit, it is each to construct and formed in advance certain circuit
5 sections when section distinguishes failure it is expected protection vector, collect and formed online the real protection vector of certain circuit；
When the diverse location failure of circuit, can obtain according to this circuit and each protection philosophy and scope on adjacent lines,
The distance I sections of the sending end of certain circuit protect about the 70~85% of this circuit, and the distance II sections on adjacent lines protect this circuit
30~40%, the scope of distance II sections protection is similar in the protection of the distance I sections of circuit receiving end and its adjacent lines；So by one
Bar circuit Li5 sections are divided into, i.e., are divided into a section every 20% from sending end to receiving end；Partition model such as Fig. 2
It is shown；
It is expected to protect vectorial Pi k, the main protection (M comprising this circuit both endsn、Mo), distance I sections protection (In、Io), distance II
Section protection (IIn、IIo), distance III sections protection (IIIn、IIIo) initiation value, direction protection component synthesis initiation value D, adjacent lines
The distance II sections protection (II at great distance endr), III sections (IIIr) protection initiation value and direction protection component synthesis value D；PiIn it is each
Element implication is identical with the section Mean Vector of the circuit, the main protection (M comprising this circuit both endsn、Mo), distance I sections protection
(In、Io), distance II sections protection (IIn、IIo), distance III sections protection (IIIn、IIIo) initiation value, direction protection component synthesis open
Dynamic value D, the distance II sections protection (II of adjacent lines distal endr), III sections (IIIr) protection initiation value and direction protection element it is comprehensive
Conjunction value D.PiAnd Pi kTwo vectorial structures are identical with dimension.
(3) suspected malfunctions circuit L is collected onlineiThis side and the protection initiation value of offside and adjacent each circuit, construction and shape
Into circuit LiReal protection vector Pi；PiMiddle each element implication is identical with the section Mean Vector of the circuit, includes this circuit two
Main protection (the M at endn、Mo), distance I sections protection (In、Io), distance II sections protection (IIn、IIo), distance III sections protection (IIIn、
IIIo) initiation value, direction protection component synthesis initiation value D, adjacent lines distal end distance II sections protection (IIr), III sections
(IIIr) protection initiation value and direction protection component synthesis value D；PiAnd Pi kTwo vectorial structures are identical with dimension；For certain
Bar circuit, it has five it is expected to protect one real protection vector of vector sum；
Define direction protection component synthesis value D：
For other each protection elements, generation action duration is 1, motionless to be used as 0；
Suspected malfunctions circuit LiReal protection vector PiFor LiBoth ends and adjacent lines distal end real protection initiation value
The vector of composition.
By taking Fig. 3 system schematics as an example, illustrate that the section of certain circuit it is expected to protect vector, the calculating side of real protection vector
Method：
Circuit L in Fig. 315K-th of section fault when it is corresponding it is expected protect vectorBy 18 protection enabling signal groups
Into：
Wherein, p1,p2,p3,p4It is L respectively15Main protection (the M of siden), I section of (I of distancen), distance II sections (IIn), distance
III sections (IIIn) protection initiation value；p5,p6,p7,p8It is L respectively15The main protection (Mo) of offside, distance I sections (Io), distance II
Section (IIo), the protection initiation value of distance III sections (IIIo)；p9It is L15Side and the integrated value D of offside direction protection element；p10,
p11,p12It is adjacent lines L14The distance II sections (IIr) of distal end, the protection initiation value and L of III sections (IIIr)14Directional element it is comprehensive
Conjunction value D；Similarly, p13,p14,p15And p16,p17,p18It is adjacent lines L respectively12And L9The distance II sections of distal end, the protection of III sections
Initiation value and direction protection component synthesis value；According to the abort situation of k-th of section, the expectation respectively protected in the section can be provided
Initiation value.
For circuit L15If it is close to bus B9The 1st section break down, can obtain the 1st section expectation
Protection vector is as follows：
Bracket interior element represents the directional element synthesis initiation value of each circuit；
Similarly, can obtain failure to occur in the 2nd, 3,4,5 section, corresponding each section it is expected to protect vector as follows：
(4) circuit L is calculatediPiSection weighted failure matching degree between each expectation protection vector of m section, takes
Wherein Trouble Match degree M of the maximum as the circuiti；
According to circuit LiReal protection vector and its each section it is expected to protect the section weighted registration model between vector；
In formula：Represent suspected malfunctions circuit LiReal protection vector PiWhen being broken down with k-th of section of the circuit
Expectation protect vectorial Pi kBetween section weighted failure matching degree；
NiRepresent real protection vector PiDimension；
PijRepresent real protection vector PiIn j-th of element；
Represent that k-th of section it is expected to protect vectorial Pi kIn j-th of element；
Ti kRepresent suspected malfunctions circuit LiK-th of section L when breaking downiEach wide area protection in both ends it is expected working value
Weight sum；
ωjRepresent the weight coefficient of each wide area protection.
Define suspected malfunctions circuit LiTrouble Match degree, i.e. line taking road LiReal protection vector PiWith m section phase
Maximum in the weighted failure matching degree between protection vector is hoped, as circuit LiTrouble Match degree Mi, computational methods are as follows：
According to above formula, from circuit LiM section weighted failure matching degree in, obtain circuit LiTrouble Match degree Mi。
Using above-mentioned function, circuit L is brought into respectivelyiReal protection vector, its five sections it is expected to protect vector, can obtain
To circuit LiFive section weighted failure matching degree (Mi 1,Mi 2,Mi 3,Mi 4,Mi 5), take wherein event of the maximum as the circuit
Hinder matching degree Mi；
The Trouble Match degree of faulty line is more much bigger than the Trouble Match degree of regular link, and this turns into detection faulty line
Important evidence；
Now illustrate the Trouble Match degree acquiring method of each line related during certain line fault；Circuit L in Fig. 3 is set15B9
Broken down at side 5%；If L15Both sides main protection, L15B9Lateral extent I section trippings, other protections are correct to be acted, then L15's
Real protection vector is as follows：
Wherein the vectorial element underlines expression relay fail；
L15Each protection weights omegajValue is：
[ω1,ω2,…,ω18]=[3,3,2,2,3,3,2,2,3,2,2,3,2,2,3,2,2,3]
L155 sections protection act weighting sum vector T15For：
The expectation protection weighting sum of each section of circuit is otherwise varied, and the expectation protection initiation value among circuit with two head sections adds
It is smaller to weigh sum, and the expectation in 2nd area and 4th area protection initiation value weighting sum is maximum；It is calculated according to weighted failure adaptation function
L15Real protection vector its 5 sections expectation protect vector between matching degree be respectively The Trouble Match degree of the first section is maximum in five sections, takes it as L15
Trouble Match degree M15, i.e. M15=0.719.
Similar, it can obtain regular link L14Expectation protection vector sum real protection vector, it is expected L14Expectation protection
Jingle bell no longer repeats, and its real protection vector is as follows：
L145 sections protection act weighting sum T14For：
Due to L14And L15Neighbourhood topology it is different, corresponding T14With T15Slightly difference；Letter is matched according to weighted failure
L is calculated in number14It is expected that the section matching degree between protection vector is respectively with its 5 failures： Obtain L14Final Trouble Match degree M14=0.344.
Fig. 3 is partial electric grid structure and failure partition model in IEEE14 node systems, with circuit L15Exemplified by, illustrate this hair
Bright validity and fault-tolerance.
(5) three failure criterions are built, if certain circuit meets failure criterion, judge it for faulty line；If no
Meet failure criterion, then judge whether to have traveled through all suspected malfunctions circuit Li, if it is, exit, otherwise, repeat step
(1)-step (4).
Wide area backup protection failure criterion is used first
That is, as suspected malfunctions circuit LiFailure degree MiThan its all adjacent lines LkFailure degree MkIt is all big, and MiWith Mk
Difference be both greater than 0.15, and MiMore than failure degree threshold value Mset, then L is judgediFor faulty line；MsetIt is recommended that it is set to 0.4~
0.45。
When false protection or information distortion digit more (such as four and its more than), it is possible that a small amount of fault wire
The close special circumstances of the failure degree of failure degree certain regular link adjacent thereto on road, are now sentenced using wide area backup protection failure
According to faulty line can not be accurately judged to, in the case where wide area backup protection failure is invalid, using following failure criterion；
In formula：pj,LiFor suspected malfunctions circuit LiReal protection vector in j-th protection element；Represent doubtful
Faulty line LiThe protection element number sum that both sides have been turned on；That is the main protection at certain circuit both ends, distance I sections, II sections, III
Section protection initiation value and directional element integrated value；Represent suspected malfunctions circuit LkThe protection element number that both sides have been turned on
Sum；
I.e.：As suspected malfunctions circuit LiFailure degree MiThan its all adjacent lines LkFailure degree MkIt is all big, and doubtful event
Hinder circuit LiFailure degree MiCircuit L adjacent theretokFailure degree MkDifference be less than 0.15 (two failure degree are closer to), and Mi
More than failure degree threshold value Mset, and LiBoth sides have been turned on protection element number sum and are more than LkBoth sides have been turned on protection element number it
With then judge LiFor faulty line.
When false protection or information distortion digit reach 7 and the above, it is possible that the failure degree of faulty line with
The failure degree of its certain adjacent regular link is both less than Mset, following criterion is used in the case where above-mentioned two criterion is all invalid：
I.e.：When suspected malfunctions circuit Li failure degree Mi is less than failure degree threshold value Mset, and it is more than the second fault threshold
Mset2, and when all adjacent lines Lk failure degree Mk is both less than Mset2, then judge Li for faulty line；Mset suggests being set to
0.3~0.35.
Embodiment 1
Assuming that circuit L in Fig. 315B9A failures, L occur at side 10%15B9Side main protection tripping, L15B9Lateral extent I
Section relay fail；It is online to collect circuit L15、L14、L12、L9Both ends protection enabling signal, find they all at least one
It is 1 (protection starts) to protect enabling signal, regathers the wide area protection enabling signal of these circuits and its adjacent lines, forms this
The real protection vector of several circuits (element, which underlines, represents relay fail)：
The Trouble Match degree for calculating this several circuits is respectively M15=0.812, M14=0.344, M12=0.344, M9=
0.194。
By wide area backup protection failure criterion, L can determine whether15For faulty line, now there are two relay fails, this method energy
Correctly judge faulty line.
Embodiment 2
If circuit L in Fig. 315B9A phase faults occur for k1 at side 10%；L15Both sides main protection tripping, L15And B9Side away from
From I section relay fails, adjacent lines L14B9Lateral extent II section false protections；
It is online to collect circuit L15、L14、L12、L9Both ends protection enabling signal, find they all at least one protect
Enabling signal is 1 (protection starts), regathers the wide area protection enabling signal of these circuits and its adjacent lines, forms this several
The real protection of circuit is vectorial (the boxed false protection of element)：
The Trouble Match degree for calculating this several circuits is respectively M15=0.719, M14=0.406, M12=0.344, M9=
0.194。
By wide area backup protection failure criterion, can determine whether L14 is faulty line；Although the situation of presence has four false protections
With tripping, the inventive method remains to correctly judge faulty line.
Embodiment 3
If circuit L in Fig. 315Close to bus B9Locate AB two-phase short-circuit faults；If L15The main protection tripping of both sides, L15B9Side
Distance I sections relay fail, L15B9The directional element tripping (becoming 0 by 1) of side, adjacent lines L14B9The directional element of side misses
Dynamic or distortion (becoming 1 by 0)；The protection enabling signal at the online both ends for collecting circuit L15, L14, L12, L9, finds them all
At least one protection enabling signal 1 (protection starts), the wide area protection for regathering these circuits and its adjacent lines start letter
Number, the real protection for forming this several circuits is vectorial (the boxed false protection of element)：
The Trouble Match degree for calculating this several circuits is respectively：M15=0.531, M14=0.531, M12=0.344, M9=
0.290。
For L15And L14There are 5 relay fails and the abnormal scene of malfunction, L15With L14Trouble Match degree it is equal, and all
More than 0.4, now with wide area backup protection failure criterion 2, compare the protection act number sum on two lines road, can accurately sentence
Disconnected faulty line is L15, will not be by L14Failure is mistaken for, is consistent with actual conditions.
Embodiment 4
Assuming that circuit L in Fig. 315B9AB two-phase short-circuit faults at side 10%；L is set15B9The protection equipment failure of side；
It is online to collect circuit L15、L14、L12、L9Both ends protection enabling signal, find they all at least one protection enabling signals
For 1 (protection starts), the wide area protection enabling signal of these circuits and its adjacent lines is regathered, forms the reality of this several circuits
Border protection is vectorial (the boxed false protection of element)：
The Trouble Match degree for calculating this several circuits is respectively：M15=0.594, M14=0.438, M12=0.438, M9=
0.161。
With wide area backup protection failure criterion 1, L is judged15Failure；Although line protective device failure causes 5 protections
Tripping, but this method remains to correctly judge faulty line.
Embodiment 5
Assuming that circuit L in Fig. 315B9A phases high resistance earthing fault at side 30%, it is assumed that L15Both sides main protection tripping, L15's
B9Lateral extent I section relay fails；Influenceed simultaneously by long short-term protection cooperation and the method for operation, section circuit L15B10Lateral extent I sections
Only protection is at this circuit 60%, L14B8Lateral extent II sections only protect L14End, L12B5Lateral extent II sections are only protected
To L155% at, under this scene it is multiple protection because adjust it is improper tripping occurs；It is online to collect circuit L15、L14、L12、L9Two
The protection enabling signal at end, find their all at least one protection enabling signals 1 (protection start), regather these circuits and
The wide area protection enabling signal of its adjacent lines, form real protection vector (the boxed protection mistake of element of this several circuits
It is dynamic)：
The Trouble Match degree for calculating this several circuits is respectively M15=0.6452, M14=0.2188, M12=0.2188, M9
=0.1935.
With wide area backup protection failure criterion 1, L is judged15Failure；Although now circuit L15Both sides main protection and I sections are all
Tripping, and adjacent lines II sections are adjusted improper, but this method remains to correctly detect faulty line.
The fault-tolerance of this method is verified below
For Fig. 3 typical case's electric network composition, if L15For faulty line, then more serious scene is that tripping and malfunction protection are all concentrated
In L15And its on certain adjacent regular link；For simplified experiment and without loss of generality, the present invention is with faulty line L15It is adjacent with its just
Normal circuit L14For experimental subjects, (tripping exists only in L with malfunction protection15And L14Protection vector), their real protections vector
Respectively there are 18, remove repeats bits, calculate when the Trouble Matchs of the two circuits is spent one and share 27 protection informations；For L15Five
The various scenes of individual section difference failure, in order to examine protection actual act that may be present and various special feelings under actual conditions
Condition；The present invention carries out emulation experiment using the method for exhaustion, and the scene that malfunctions respectively is protected for 1 to 7, simulate respectively it is all can
Energy error situation, the fault-tolerance of present invention detection failure is examined, as a result as shown in table 1：
Table 1 examines the fault-tolerance of the present invention using the method for exhaustion
6*, 7* represent to remove respectively single line false protection digit and gone out in six, seven of four and its above in table 1
Wrong scene.
From table 1, it can reach 100% detection correctness when at five and following protection malfunctions at random；For six
Protection error scene, invention achieves 99.87% accuracy, still has very high fault-tolerance；
Six and its above protection error when, normally with faulty line protection startup situation be possible to much like, cause to miss
Sentence or criterion failure, the false protection digit to mostly occur in single line at four and more than；This in engineering in practice hardly
Can occur, remove six after this extreme malfunction scene, seven experimental results be shown in Table 1 6*, 7*, it can be seen that malfunction and failure
Quantity declines a lot, and at this point for six errors, the present invention nearly reaches 100% accuracy.
The weighted value respectively protected also has considerable influence to the fault-tolerance of this method, according to protection philosophy and l-G simulation test, really
Determine main protection, distance I sections, distance II sections, distance III sections, directional element correspond to suitable weight coefficient be respectively 3,3,2,2,
3；It is rational that them are also demonstrated by the simulation experiment result；The present invention suitably drops the weight coefficient of main protection, distance I sections
Erroneous judgement situation that is low, may bringing during this two classes false protection for avoiding regular link both ends；The present invention considers fault wire
Multidigit relay fail on road, multidigit false protection on certain adjacent regular link, normally with close extreme of faulty line matching degree
Situation, provides multiple failure criterions, improves the fault-tolerance of wide area backup protection method on the whole.
Claims (7)
1. a kind of wide area backup protection method based on the matching of subregion weighted failure, it is characterised in that comprise the following steps：
(1) selecting both ends, at least one protects the circuit started and its adjacent lines as suspected malfunctions circuit Li(i=1,
2 ... n)；
(2) by suspected malfunctions circuit LiM section is divided into, the initiation value accordingly protected when distinguishing failure according to each section and side
To protection element integrated value D, construction circuit LiSection when k-th of section breaks down it is expected to protect vectorial Pi k；
(3) suspected malfunctions circuit L is collectediThis side and the protection initiation value of offside and adjacent each circuit, construction circuit LiActual guarantor
Protect vectorial Pi；
(4) circuit L is calculatediPiSection weighted failure matching degree between each expectation protection vector of m section, takes wherein
Trouble Match degree M of the maximum as the circuiti；
(5) failure criterion is built, if certain circuit meets failure criterion, judges it for faulty line；If it is unsatisfactory for failure
Criterion, then judge whether to have traveled through all suspected malfunctions circuit Li, if it is, exit, otherwise, repeat step (1)-step
(4)。
2. a kind of wide area backup protection method based on the matching of subregion weighted failure according to claim 1, its feature exist
In the direction protection component synthesis value D：
For other each protection elements, generation action duration is 1, motionless to be used as 0.
3. a kind of wide area backup protection method based on the matching of subregion weighted failure according to claim 1, its feature exist
In the section weighted failure matching degree of the circuitComputational methods it is as follows：
<mrow>
<msubsup>
<mi>M</mi>
<mi>i</mi>
<mi>k</mi>
</msubsup>
<mrow>
<mo>(</mo>
<msub>
<mi>P</mi>
<mi>i</mi>
</msub>
<mo>)</mo>
</mrow>
<mo>=</mo>
<mn>1</mn>
<mo>-</mo>
<mfrac>
<mrow>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>j</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<msub>
<mi>N</mi>
<mi>i</mi>
</msub>
</munderover>
<msub>
<mi>&omega;</mi>
<mi>j</mi>
</msub>
<mo>|</mo>
<msub>
<mi>p</mi>
<mrow>
<mi>i</mi>
<mi>j</mi>
</mrow>
</msub>
<mo>-</mo>
<msubsup>
<mi>p</mi>
<mrow>
<mi>i</mi>
<mi>j</mi>
</mrow>
<mi>k</mi>
</msubsup>
<mo>|</mo>
</mrow>
<msubsup>
<mi>T</mi>
<mi>i</mi>
<mi>k</mi>
</msubsup>
</mfrac>
<mo>,</mo>
<mi>k</mi>
<mo>=</mo>
<mn>1</mn>
<mo>,</mo>
<mn>2</mn>
<mo>,</mo>
<mo>...</mo>
<mo>,</mo>
<mi>m</mi>
</mrow>
In formula：Represent suspected malfunctions circuit LiReal protection vector PiPhase when being broken down with k-th of section of the circuit
Hope and protect vectorial Pi kBetween section weighted failure matching degree；
NiRepresent real protection vector PiDimension；
PijRepresent real protection vector PiIn j-th of element；
Represent that k-th of section it is expected to protect vectorial Pi kIn j-th of element；
Ti kRepresent suspected malfunctions circuit LiK-th of section L when breaking downiEach wide area protection in both ends it is expected the weighting of working value
Sum；
ωjRepresent the weight coefficient of each wide area protection.
Suspected malfunctions circuit L is re-definediTrouble Match degree, i.e. line taking road LiReal protection vector PiWith the phase of m section
Maximum in each section weighted failure matching degree between protection vector is hoped, as circuit LiTrouble Match degree Mi, computational methods
It is as follows：
<mrow>
<msub>
<mi>M</mi>
<mi>i</mi>
</msub>
<mo>=</mo>
<mi>M</mi>
<mi>a</mi>
<mi>x</mi>
<mrow>
<mo>(</mo>
<msubsup>
<mi>M</mi>
<mi>i</mi>
<mn>1</mn>
</msubsup>
<mo>,</mo>
<msubsup>
<mi>M</mi>
<mi>i</mi>
<mn>2</mn>
</msubsup>
<mo>,</mo>
<mo>...</mo>
<mo>,</mo>
<msubsup>
<mi>M</mi>
<mi>i</mi>
<mi>m</mi>
</msubsup>
<mo>)</mo>
</mrow>
</mrow>
According to above formula, from circuit LiM section weighted failure matching degree in, obtain circuit LiTrouble Match degree Mi。
4. a kind of wide area backup protection method based on the matching of subregion weighted failure according to claim 1, its feature exist
In the failure criterion is as follows：
That is, as suspected malfunctions circuit LiFailure degree MiThan its all adjacent lines LkFailure degree MkIt is all big, and MiWith MkDifference
Value both greater than 0.15, and MiMore than failure degree threshold value Mset, then L is judgediFor faulty line.
5. a kind of wide area backup protection method based on the matching of subregion weighted failure according to claim 4, its feature exist
In, in addition to following failure criterion：
In formula：pj,LiFor suspected malfunctions circuit LiReal protection vector in j-th protection element；Represent suspected malfunctions line
Road LiThe protection element number sum that both sides have been turned on,Represent suspected malfunctions circuit LkThe protection element that both sides have been turned on
Number sum；
I.e.：As suspected malfunctions circuit LiFailure degree MiThan its all adjacent lines LkFailure degree MkIt is all big, and suspected malfunctions line
Road LiFailure degree MiCircuit L adjacent theretokFailure degree MkDifference be less than 0.15, and MiMore than failure degree threshold value Mset, and Li
Both sides have been turned on protection element number sum and are more than LkBoth sides have been turned on protection element number sum, then judge LiFor faulty line.
6. a kind of wide area backup protection method based on the matching of subregion weighted failure according to claim 4, its feature exist
In, in addition to following failure criterion：
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<msub>
<mi>M</mi>
<mrow>
<mi>s</mi>
<mi>e</mi>
<mi>t</mi>
<mn>2</mn>
</mrow>
</msub>
<mo><</mo>
<msub>
<mi>M</mi>
<mi>i</mi>
</msub>
<mo><</mo>
<msub>
<mi>M</mi>
<mrow>
<mi>s</mi>
<mi>e</mi>
<mi>t</mi>
</mrow>
</msub>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<mo>&ForAll;</mo>
<msub>
<mi>M</mi>
<mi>k</mi>
</msub>
<mo><</mo>
<msub>
<mi>M</mi>
<mrow>
<mi>s</mi>
<mi>e</mi>
<mi>t</mi>
<mn>2</mn>
</mrow>
</msub>
<mo>,</mo>
<mi>k</mi>
<mo>&NotEqual;</mo>
<mi>i</mi>
<mo>,</mo>
<mi>k</mi>
<mo>=</mo>
<mn>1</mn>
<mo>,</mo>
<mn>2</mn>
<mo>,</mo>
<mo>...</mo>
<mo>,</mo>
<mi>n</mi>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
I.e.：As suspected malfunctions circuit LiFailure degree MiLess than failure degree threshold value Mset, and it is more than the second fault threshold Mset2, and institute
There is adjacent lines LkFailure degree MkBoth less than Mset2When, then judge LiFor faulty line.
7. a kind of wide area backup protection method based on the matching of subregion weighted failure according to claim 1, its feature exist
In the principle and its guarantor to this circuit and next stage adjacent lines that circuit is respectively protected used by the step (2)
Scope is protected, by certain suspected malfunctions circuit Li5 sections are divided into, i.e., are divided into an area every 20% from sending end to receiving end
Section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710545951.0A CN107425511B (en) | 2017-07-06 | 2017-07-06 | One kind being based on the matched wide area backup protection method of subregion weighted failure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710545951.0A CN107425511B (en) | 2017-07-06 | 2017-07-06 | One kind being based on the matched wide area backup protection method of subregion weighted failure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107425511A true CN107425511A (en) | 2017-12-01 |
| CN107425511B CN107425511B (en) | 2019-03-01 |
Family
ID=60427443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710545951.0A Active CN107425511B (en) | 2017-07-06 | 2017-07-06 | One kind being based on the matched wide area backup protection method of subregion weighted failure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107425511B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108872792A (en) * | 2018-07-16 | 2018-11-23 | 西南交通大学 | A kind of electric transmission line fault detection method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119243A (en) * | 2015-09-11 | 2015-12-02 | 合肥工业大学 | Wide area backup protection method based on fault voltage ratio and multi-information fusion |
-
2017
- 2017-07-06 CN CN201710545951.0A patent/CN107425511B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119243A (en) * | 2015-09-11 | 2015-12-02 | 合肥工业大学 | Wide area backup protection method based on fault voltage ratio and multi-information fusion |
Non-Patent Citations (2)
| Title |
|---|
| 童晓阳 等: "The Multi-section Weighed Fault Matching and Detecting Algorithm Using Wide-area Protections", 《PROCEEDINGS OF THE 35TH CHINESE CONTROL CONFERENCE》 * |
| 马静 等: "基于故障匹配度的广域后备保护新原理", 《电力系统自动化》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108872792A (en) * | 2018-07-16 | 2018-11-23 | 西南交通大学 | A kind of electric transmission line fault detection method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107425511B (en) | 2019-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104297637B (en) | The power system failure diagnostic method of comprehensive utilization electric parameters and time sequence information | |
| CN103308824B (en) | Power system fault diagnostic method based on probability Petri net | |
| CN103487723B (en) | Fault diagnosis method of electric power system and system | |
| CN109507526A (en) | Fault Diagnosis Method for Distribution Networks based on synchronous phasor measurement and covariance matrix theory | |
| CN102035202B (en) | Network reconfiguration system | |
| CN108445349A (en) | A kind of current sequence components comparison expression fault section location method of the feeder line containing DG | |
| CN107979075A (en) | A kind of multiterminal flexible direct current power grid DC line Non-unit protection method | |
| CN105183952B (en) | A kind of power transmission network method for diagnosing faults based on separation time Fuzzy Petri Net | |
| CN112595930B (en) | Backup protection method for petal type urban power grid area containing distributed power supply | |
| CN106226658A (en) | A kind of electric network failure diagnosis method based on multi-data fusion | |
| CN109975661A (en) | A kind of electric transmission line fault detection method based on Spearman's correlation coefficient | |
| CN103328991A (en) | Method and arrangement for an internal failure detection in a y-y connected capacitor bank | |
| CN107015123B (en) | A kind of accurate determination method of transmission line malfunction based on recorder data | |
| CN104380554A (en) | Fault detection in energy supply networks | |
| CN103778274A (en) | Ultrahigh-voltage circuit relaying protection system reliability assessment method with covert faults taken into consideration | |
| CN103901320A (en) | Method for diagnosing power system fault considering multi-source data | |
| CN104485736A (en) | Intelligent protection center-based wide-area backup protection system and method | |
| CN103715669B (en) | The alternate back-up protection method of distributed wide area self adaptation | |
| CN110045207A (en) | A kind of complex fault diagnostic method based on power grid architecture and multisource data fusion | |
| Alajmi et al. | Fault detection and localization in solar photovoltaic arrays using the current-voltage sensing framework | |
| CN105445585A (en) | Fault diagnosis method and system for primary loop of power grid | |
| CN106771853A (en) | A kind of intelligent power network method for diagnosing faults based on event origin | |
| Wang et al. | Multi-vendor interoperability tests of IEDs for HVDC grid protection | |
| CN106597845A (en) | Diagnosis method for power transmission network fault based on multi-objective optimization | |
| CN107425511B (en) | One kind being based on the matched wide area backup protection method of subregion weighted failure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |