CN108429245A - Wide area backup protection method based on sequence electric current grey correlation and Multi-information acquisition - Google Patents
Wide area backup protection method based on sequence electric current grey correlation and Multi-information acquisition Download PDFInfo
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- CN108429245A CN108429245A CN201810245206.9A CN201810245206A CN108429245A CN 108429245 A CN108429245 A CN 108429245A CN 201810245206 A CN201810245206 A CN 201810245206A CN 108429245 A CN108429245 A CN 108429245A
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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
- H02H7/26—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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The present invention relates to a kind of wide area backup protection method based on sequence electric current grey correlation and Multi-information acquisition; electrical power system transient information is excavated using grey relational grade; and it is combined with status information; it merges multi information and carries out power grid fault line judgement; joint transient state electrical quantity; possess better fault freedom compared to simple simple information integration technology, electrical quantity can effectively make up because of information errors or missing caused by the reasons such as transmission channel failure and sampling；The method for introducing sequence electric current grey correlation analysis so that protection still has good performance under the complex working conditions such as high resistance ground, open-phase operation, and carries certain sensitivity；For the present invention while taking into account reliability with high fault tolerance, data source need not further put into synchronous phase measuring in power system device, only substation need to be utilized to have device, relatively inexpensive.This method has high fault freedom, and has under complex working condition certain adaptability and well dynamic make performance.
Description
Technical field
The present invention relates to a kind of electrical management protection techniques, more particularly to a kind of to be based on sequence electric current grey correlation and multi information
The wide area backup protection method of fusion.
Background technology
Deepening development, the structure of electric system become more complicated China's power industry, are believed on the spot using substation
Breath carrys out the Limited information that the traditional relay protection configuration method of failure judgement is obtained, and is difficult to send out in certain failure and specials
Wave the due performance of protection.Therefore, it has been proposed that the wide area backup protection based on SCADA/WAMS measuring system data, to solve
Traditional relay protection saliency problem.
Due to wide area system nodal information in remote transmission it is possible that the case where error code and packet loss, this can make
Policy-making body judges by accident, this just needs back-up protection algorithm of the research with fault-tolerant ability.Currently, usually utilizing following two
Information builds protection algorism：One is traditional electric quantity informations；Another kind is the state letter returned based on each node IED
Breath.Conventional electrical amount strong antijamming capability, and the advantage of protection element feedback information is then that volume of transmitted data is few.
Early in 2010, Zhang Baohui was in document《Wide area backup protection algorithm with fault freedom》Middle proposition can utilize
This circuit relay protection system status information (such as：Distance I, II, III segment information and directional element etc.) identify failure, it can
To reach preferable fault identification effect in the case of a small amount of loss of learning.2013, Wang Rui was in document《Based on Correlation Moment
The power grid wide area backup protection algorithm of battle array》It is further improved above-mentioned Zhang Baohui documents, it is believed that combine this circuit and protected with adjacent lines
Shield information can preferably improve the fault-tolerance of back-up protection algorithm.2015, Li Shan was in document《Compared based on false voltage and more
The wide area backup protection of information fusion is calculated》It is middle to be further improved above-mentioned 2 documents using information fusion technology, it achieves
Preferable fault freedom, while having been gradually formed in academic enclose and having realized that the research of power grid back-up protection is seen using multi-source information
Point.Effectiveness of information and algorithm fault-tolerant ability is further increased to improve, using including that genetic algorithm, binary system population are calculated
The intellectual technologies such as method, evidence theory become the another approach of wide area backup protection new principle research.
Information node is numerous in power grid, and acquisition range is wide, it is difficult to have preferable anti-interference ability as conventional electrical amount,
And the accuracy of the transmission of status information can increase with the quantity by routing node and be declined, it is difficult to accomplish the errorless of information
It transmits, it is therefore desirable to which wide area backup protection algorithm has information errors certain fault-tolerant ability, to reach the reliable of relay protection
Property require.
In recent years, the prior art only considers the application of quantity of state, rarely has consideration while utilizing the anti-interference energy of electrical transient
The strong advantage of power improves the fault-tolerance of wide area backup protection to combine.Although intelligent algorithm has certain excellent in terms of improving fault-tolerance
Gesture, but there is no utilizing in Practical Project, main cause are (1) there are algorithm precocity, may cause to select mistake, with after
Electric protection selectivity mutually conflicts；(2) algorithm needs study in advance, once operating mode is complicated, may lead to nothing because of information content deficiency
Method restrains, and can not finally determine fault element position.For the numerous power information of data, in existing wide area backup protection technology
Rarely have in the way of data mining (the shortcomings that abandoning the intelligent algorithms such as neural network) to be identified and improve to failure
The method of fault freedom.
Invention content
The present invention be directed to wide area backup protection technology there are the problem of, it is proposed that one kind based on sequence electric current grey correlation with
The wide area backup protection method of Multi-information acquisition excavates electrical power system transient information, and and status information using grey relational grade
It is combined, merges multi information, this method has high fault freedom, and has certain adaptability simultaneous good under complex working condition
Dynamic makees performance.
The technical scheme is that：A kind of wide area backup protection side based on sequence electric current grey correlation and Multi-information acquisition
Method specifically comprises the following steps：
1) startup of region back-up protection and the detection of suspected malfunctions circuit：
Subregion is carried out to power grid using integrated distribution formula principle；Back-up protection startup is carried out to the regional power grid after subregion to sentence
It is disconnected；When one's respective area, back-up protection criterion meets, Central Substations are positive and negative to the busbar in subregion, residual voltage amplitude is distinguished
It is ranked up from big to small, then chooses two busbares of positive sequence minimum and negative, maximum two busbares of residual voltage respectively, return
It receives after arrangement, the circuit between arbitrary two busbares that connection is chosen is as suspected malfunctions circuit；
2) circuit synthetic sequence failure of the current degree P is sought according to sequence electric current grey correlation analysis principleI, specifically seek step
It is as follows：
The calculating of A synthetic sequence electric currents：
If I1、I2、I0To measure obtained positive and negative, zero-sequence current, I on the left of suspected malfunctions circuit L1 suspected malfunctions point1′、
I2′、I0' positive and negative, the zero-sequence current measured for circuit L1 suspected malfunctions point right side, if IS1、IS2、IS0For the both sides circuit L1 just,
Negative, zero-sequence current amplitude absolute value of the difference,
Then synthetic sequence electric current
The computational methods of B grey relational grades：
If reference waveform sequence is
X0={ x0(t) | t=1,2,3 ..., n } (2)
In formula：What t was represented is Each point in time；N is the length for observing wave sequence；x0(t) be t moment waveform width
Value；
Comparison wave sequence so in same observation period n is just set as
Xi={ xi(t) | t=1,2,3 ..., n } (3)
In formula, what i was represented is the serial number for comparing waveform, reference waveform sequence compared with wave sequence i at time point t
Incidence coefficient is as follows：
In formula, ξ is known as resolution ratio, is taken as 0.5；
And it is exactly reference waveform compared with that all time points within the entirely research period, which correspond to the average of incidence coefficient,
Grey relational grade γ (X between waveform0, Xi) be：
C seeks two grey relational grades of circuit synthetic sequence electric current according to grey correlation analysis synthetic sequence electric current principle：
After breaking down in subregion, Central Substations find out suspected malfunctions circuit according to sequence voltage sequence, calculate separately
The synthetic sequence electric current of each circuit is as wave sequence Xi, for any one circuit L in suspected malfunctions circuiti, by the wave before failure
Shape xi(t), t=ti- kT, k=3,2,1, it is used as 3 periodic waveforms with reference to wave sequence, and after fault point and compares sequence
Row, using formula (4) and (5), obtain obtaining the grey relational grade γ of synthetic sequence current waveform from the angle of time1；
Circuit synthetic sequence electricity is obtained using the wave sequence of 3 cycles after the wave sequence and failure of 1 cycle before failure
Grey relational grade γ between stream2；
D calculates wave-form similarity and failure degree using grey relational grade：
Circuit LiThe calculation formula of wave-form similarity is as follows：
Failure degree PICalculation formula handle as follows：
Work as PIWhen more than 1, it is enabled to be equal to 1；
3) failure degree P is sought to circuit according to the information fusion of protection element status information detectionII；
4) step 2) is weighted with the failure degree of step 3) and merges to obtain joint failure degree P=0.6PI+0.4PIIIf
The joint failure degree P ＞ 0.8 of certain suspected malfunctions circuit can then be determined as faulty line.
The beneficial effects of the present invention are：The present invention is based on the wide area standby of sequence electric current grey correlation and Multi-information acquisition guarantors
Maintaining method combines transient state electrical quantity, possesses better fault freedom compared to simple simple information integration technology, electrical quantity can
Effectively to make up because of information errors or missing caused by the reasons such as transmission channel failure and sampling；Introduce sequence electric current grey correlation
The method of analysis so that protection still has good performance, and band under the complex working conditions such as high resistance ground, open-phase operation
There is certain sensitivity；For the present invention while taking into account reliability with high fault tolerance, data source need not further put into PMU
(synchronous phase measuring in power system device Phasor Measurement Unit are used to synchronize the measurement and output of phasor
And carry out the device of dynamically recording), only substation need to be utilized to have device, it is relatively inexpensive.
Description of the drawings
Fig. 1 is simple line fault schematic diagram；
Fig. 2 is the synthetic sequence current waveform sequence curve figure of regular link and faulty line；
Fig. 3 is the method for the present invention flow chart.
Specific implementation mode
A kind of wide area backup protection method being based on sequence electric current grey correlation analysis and Multi-information acquisition, including it is following
Step：
1, the startup of region back-up protection and the detection of suspected malfunctions circuit；
2, circuit synthetic sequence failure of the current degree is sought according to sequence electric current grey correlation analysis principle；
3, failure degree is sought to circuit according to the information fusion of protection element status information detection；
4, step 2 is weighted with the failure degree of step 3 and merges to obtain joint failure degree.
1, the startup of region back-up protection and suspected malfunctions detection method are as follows：
1) Grid
Since power grid is very vast, node is numerous, and entire power grid is unrealistic as the object of wide area backup protection.Cause
This needs to carry out subregion to power grid, and what the area principle of the method for the present invention utilized is document《Limited Wide area protective relaying system
Area principle and implementation method》Described in integrated distribution formula principle.The integrated distribution subregion of power grid can reduce power information
Transmission quantity can also reduce the routing node that information is transmitted to regional center substation warp.
2) back-up protection start-up criterion
(1) when the main protection of circuit both sides detects failure and all correctly action or system are in open-phase operation shape
When state, this paper back-up protections do not start；
(2) if certain circuit both sides IED in subregion (IED is the abbreviation of Intelligent Electronic Device,
It is intelligent electronic device) main protection has all trippings of side tripping or both sides in feedback status information, while circuit distance protection is believed
Breath and directional element information also indicate that out may be faulty, then Bulk Supply Substation starts this paper back-up protection algorithms in subregion；
(3) when failure is happened at boundary line road, if boundary power line main protection tripping, by connected 2 subregions of the circuit
Judge as a subregion.
3) suspected malfunctions wireline inspection
When one's respective area, back-up protection criterion meets, Central Substations can, residual voltage positive and negative to the busbar in subregion
Amplitude is ranked up from big to small respectively, then chooses two busbares and negative (zero) sequence voltage maximum two of positive sequence minimum respectively
Busbar, after induction-arrangement, the circuit between arbitrary two busbares that can choose connection is as suspected malfunctions circuit.With reference to
As soon as the selection of circuit can be a certain circuit for being separated by an electrical distance with suspected malfunctions circuit, what electrical distance here referred to
It is the circuit between adjacent busbar.And it (can be adopted by suspected malfunctions circuit both sides substation oscillograph synchrodata in subregion
Sample frequency can be 10kHz) transient current data are obtained, while obtaining both sides IED data (the i.e. state letter of protection element
Breath).
2, circuit synthetic sequence failure of the current degree is sought according to sequence electric current grey correlation analysis principle the specific method is as follows：
1) calculating of synthetic sequence electric current
Fig. 1 is simple line fault (generally referred to as short circuit) schematic diagram of certain circuit.If I1、I2、I0For suspected malfunctions line
Obtained positive and negative, zero-sequence current, I are measured on the left of the L1 suspected malfunctions point of road1′、I2′、I0' surveyed for circuit L1 suspected malfunctions point right side
Positive and negative, the zero-sequence current obtained.If ISi(i=1,2,0) is circuit L1Each sequence current amplitude absolute value of the difference in both sides, when doubtful in Fig. 1
Like fault point k1When place breaks down, the I of circuit L1SiIt generally will be to should be greater than the I of non-fault line in amplitudeSi, due to three
The feature that kind sequence electric current is had nothing in common with each other when different types of faults occur, therefore synthetic sequence electric current such as formula (1) is set, carry out characterization failure
The feature of sequential electric current.
2) computational methods of grey relational grade
What existing Liu Sifeng write《Gray system theory and its application》It is discussed in detail, only does brief narration here.
The basic thought of grey correlation analysis is between judging different sequences according to the similarity degree of curve geometry
Contact it is whether close.If reference waveform sequence is
X0={ x0(t) | t=1,2,3 ..., n } (2)
In formula：What t was represented is Each point in time；N is the length for observing wave sequence；x0(t) be t moment waveform width
Value.
Comparison wave sequence so in same observation period n can be set as
Xi={ xi(t) | t=1,2,3 ..., n } (3)
In formula, what i was represented is the serial number for comparing waveform.Reference waveform sequence compared with wave sequence i at time point t
Incidence coefficient is as follows：
In formula, ξ is known as resolution ratio, is taken as 0.5.
And it is exactly reference waveform compared with that all time points within the entirely research period, which correspond to the average of incidence coefficient,
Grey relational grade between waveform, formula are as follows：
3) grey correlation analysis synthetic sequence electric current principle is utilized
After breaking down in subregion, Central Substations find out suspected malfunctions circuit according to sequence voltage sequence, calculate separately
The synthetic sequence electric current of each circuit is as wave sequence Xi.If it is respectively L1, L2, L3, L4 to have 4 circuits in a certain region, wherein
When L2 breaks down, the situation of change of the synthetic sequence electric current of this 4 circuits as shown in Fig. 2, and faulty line L2 in Fig. 2, remaining
For 3 regular links.From Fig. 2 it can be found that the amplitude of the synthetic sequence electric current of L2 before and after failure can apparent step, L1, L3,
L4 only has small fluctuation in contrast.Therefore, L1, L3, L4 are more nearly relative to L2 in amplitude before and after failure, rather than
Contact between faulty line synthetic sequence electric current is also more closely.Can so it utilize grey correlation analysis to X1、X2、X3、X4Point
It is close faulty line L2 that analysis, which finds out contact not,.
4) two grey relational grades of circuit synthetic sequence electric current are sought according to 3) principle
Utilize document《HF-EMD frequency selection purposes principle and the application in transient disturbance detection》Described in method acquire therefore
Moment t occurs for barrieri, the waveform of each 3 cycles (1 cycle is 0.02s) before and after failure is then intercepted respectively to study.For doubtful
Any one circuit L in faulty linei, by the waveform x before failurei(t) (t=ti- kT, k=3,2,1) as with reference to waveform sequence
Row, and 3 periodic waveforms after fault point are used as and compare sequence.Finally, formula (4), formula (5) are utilized, so that it may with from the time
Angle obtains the grey relational grade γ of synthetic sequence current waveform1。
By observation type (4) and (5) it can be found that by wave sequence dissimilar (distance between points is big) point
Incidence coefficient γ (the x arrived0(t), xi(t)) quantity is more, then the degree of correlation obtained after formula (5) calculating is with regard to smaller.In order to more preferable
Ground embodies difference of the synthetic sequence electric current between regular link and faulty line, between several doubtful circuits and reference line into
When row correlation analysis, may be used before failure 1 cycle wave sequence and 3 cycles after failure wave sequence into
Row research.If fault moment is 0.5s, that is, waveform time is studied between 0.48~0.56s.Using formula (4), (5) by meter
Calculate the grey relational grade γ that can be obtained by between circuit synthetic sequence electric current2。
5) grey relational grade is utilized to calculate wave-form similarity and failure degree
Through 4) respectively obtaining grey relational grade γ1With γ2, γ is shown by a large amount of simulation calculation1With γ2It compares, γ1
The contact of the degree of correlation of shown regular link is close, and resolving ability is also more outstanding.Therefore, γ1Weight be arranged ratio
γ2Height, circuit LiThe calculation formula of wave-form similarity is as follows：
Meanwhile it being calculated through Multi simulation running, failure degree PICalculation formula handle as follows：
Work as PIWhen more than 1, it is enabled to be equal to 1.
3, the information fusion detected according to protection element status information seeks failure degree to circuit, and the specific method is as follows：
1) fusion of protection element information
According to document《Power grid wide area backup protection algorithm based on correlation matrix》Conclusion, in the protection member for considering this circuit
Adjacent lines protection element information is may be incorporated into while part information, to enhance result of calculation failure between suspected malfunctions circuit
Stationkeeping ability.
This route protection component information fault assessment coefficient is denoted as COS, adjacent lines protection element is to this line fault
Evaluation coefficient is denoted as CBS.Fault assessment coefficient COSBe it is value added to a power of this route protection component status information, it represent
It is evaluation of this route protection component status information to the line fault degree.
COs=α (M+M ')+α1(DI+DI′)+α2(DII+DII′)+α3(DIII+DIII′)+F (8)
Wherein：M、DI、DII、DIIIIt is II sections of I sections of main protection information, distance, the distance and distance of this circuit side respectively
III sections of action message；M ', DI', DII', DIII' be the circuit other side component information.α、α1、α2、α3Be respectively main protection,
The weights of I sections of distance, III sections of II sections of distance and distance.It, can be true according to its protection domain when main protection sends out actuating signal
It is very big in the probability of this circuit to determine failure, so α, α1It is set as 1.Due to III sections of protection of II sections of distance protection and distance protection
Range exceeds this circuit, according to document《wide-area backup protection algorithm based on
distance protection fitting factor》Introduce the concept of failure contribution degree, it is believed that II sections of circuit distance protection
Impedance should be adjusted with the III sections of contribution degrees to judging this circuit and adjacent lines fault assessment according to it to fall in respective lines
Ratio (i.e. protection domain) determines.In view of the influence of braning factor, and simplify to calculate and be easy to engineer application, weights (i.e.
Contribution degree) α2、α3Determination on, can be according to the generally acknowledged protection domain of distance protection (that is, II sections of distance protection is considering branch
Can be extended at the 30% of next stage circuit after coefficient, three sections of distance protection may extend to the 100% of next stage circuit) come really
Determine weights, therefore III sections of II sections of distance protection and distance protection are respectively 0.77 and 0.5 to the weights of this circuit.What F was represented
It is the comprehensive descision value of circuit both sides directional element, regulation positive direction is to be directed toward circuit from busbar herein, and value is as follows：
In formula (9), only when the directional element information of this circuit both sides IED feedbacks is all 1, i.e. forward direction or a side
It could contribute to the breakdown judge of this circuit when failing (being zero) for positive direction another party, otherwise contribution margin is 0.
Adjacent lines is to this side fault assessment coefficient CBSIt is distance II sections of a circuit distant place, the distance III of adjacent lines IED feedbacks
One weighted value of section and directional element information.II sections of distance is added, is II sections of protections of distance because of adjacent lines distal side
Range extends to this circuit, and can judge to contribute to this line fault, as shown in formula (10).
CBS=a × DIIN′+b×DIIIN′+c×F′ (10)
In formula：DIIN′、DIIIN' it is that II sections of the distance that adjacent lines distal side IED is returned is believed with III sections of states of distance respectively
Breath；A and b is corresponding weights respectively, and 0.23 and 0.5 should be taken as according to obtaining value method before；F ' is two side of adjacent lines
To the informix value of element, value is identical as F, but value condition changes, and formula is such as shown in (11).Because adjacent
It may not be able to directly judge that this circuit breaks down when line direction element movement, so the weights c of F is taken as 0.2.
Value in bracket respectively represents the state value of nearside and distal direction element.
2) adjusting for fault threshold values calculates with failure degree
Line fault judge coefficient of colligation be
Cout=COS+CBS (12)
Fault threshold values adjust reference literature《Wide area relay protection criterion research based on Longitudinal comparison principle》Think of
Think, CsetIt is adjusted according to following thinking：If the quantity of adjacent lines is m, if the IED failures of circuit head end, main protection tripping and phase
When adjacent line road nearside IED fails, circuit 3 points of C when breaking down respectively at head end, end and circuit 50% are calculated separatelyOSWith
CBSThe sum of average value.Through calculating back door threshold value expression formula be
Cset=2.19+0.63m (13)
After obtaining threshold value, failure degree PIIIt can be according to Cout/CsetIt calculates, value calculates beyond 1 according to 1.
4, step 2 is weighted by root with the failure degree of step 3 merges to obtain joint failure degree the specific method is as follows：
Can respectively obtain two kinds of failure degree according to step 2 and step 3 because electrical quantity with 01 have compared with -1 information content
The anti-interference and high advantage of accuracy, therefore some weights are suitably improved for waveform similar fault degree, fusion formula is as follows：
P=0.6PI+0.4PII (14)
By Multi simulation running experimental calculation, can be determined as if the P ＞ 0.8 that certain suspected malfunctions circuit is obtained through formula (14)
Faulty line.The particular flow sheet of method is as shown in Figure 3.
Claims (1)
1. a kind of wide area backup protection method based on sequence electric current grey correlation and Multi-information acquisition, which is characterized in that specific packet
Include following steps：
1) startup of region back-up protection and the detection of suspected malfunctions circuit：
Subregion is carried out to power grid using integrated distribution formula principle；Back-up protection is carried out to the regional power grid after subregion and starts judgement；
When one's respective area, back-up protection criterion meets, Central Substations are positive and negative to the busbar in subregion, residual voltage amplitude is respectively from big
It is ranked up to small, then chooses two busbares of positive sequence minimum and negative, maximum two busbares of residual voltage respectively, conclude whole
After reason, the circuit between arbitrary two busbares that connection is chosen is as suspected malfunctions circuit；
2) circuit synthetic sequence failure of the current degree P is sought according to sequence electric current grey correlation analysis principleI, specifically seek that steps are as follows：
The calculating of A synthetic sequence electric currents：
If I1、I2、I0To measure obtained positive and negative, zero-sequence current, I on the left of suspected malfunctions circuit L1 suspected malfunctions point1、I2、I0For
Positive and negative, the zero-sequence current measured on the right side of circuit L1 suspected malfunctions point, if IS1、IS2、IS0For the both sides circuit L1 are positive and negative, zero sequence is electric
Amplitude absolute value of the difference is flowed,
Then synthetic sequence electric current
The computational methods of B grey relational grades：
If reference waveform sequence is
X0={ x0(t) | t=1,2,3 ..., n } (2)
In formula：What t was represented is Each point in time；N is the length for observing wave sequence；x0(t) be t moment waveforms amplitude；
Comparison wave sequence so in same observation period n is just set as
Xi={ xi(t) | t=1,2,3 ..., n } (3)
In formula, what i was represented is the serial number for comparing waveform, the associations of wave sequence i at time point t compared with of reference waveform sequence
Coefficient is as follows：
In formula, ξ is known as resolution ratio, is taken as 0.5；
And it is exactly reference waveform waveform compared with that all time points within the entirely research period, which correspond to the average of incidence coefficient,
Between grey relational grade γ (X0, Xi) be：
C seeks two grey relational grades of circuit synthetic sequence electric current according to grey correlation analysis synthetic sequence electric current principle：Work as subregion
After inside breaking down, Central Substations find out suspected malfunctions circuit according to sequence voltage sequence, calculate separately the synthetic sequence of each circuit
Electric current is as wave sequence Xi, for any one circuit L in suspected malfunctions circuiti, by the waveform x before failurei(t), t=ti-
KT, k=3,2,1, as 3 periodic waveforms with reference to wave sequence, and after fault point as sequence is compared, utilize formula (4)
(5), it obtains obtaining the grey relational grade γ of synthetic sequence current waveform from the angle of time1；
Using the wave sequence of 3 cycles after the wave sequence and failure of 1 cycle before failure obtain circuit synthetic sequence electric current it
Between grey relational grade γ2；
D calculates wave-form similarity and failure degree using grey relational grade：
Circuit LiThe calculation formula of wave-form similarity is as follows：
Failure degree PICalculation formula handle as follows：
Work as PIWhen more than 1, it is enabled to be equal to 1；
3) failure degree P is sought to circuit according to the information fusion of protection element status information detectionII；
4) step 2) is weighted with the failure degree of step 3) and merges to obtain joint failure degree P=0.6PI+0.4PIIIf certain is doubted
It can then be determined as faulty line like the joint failure degree P ＞ 0.8 of faulty line.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN113128153A (en) * | 2021-04-20 | 2021-07-16 | 合肥工业大学 | Active frequency conversion fault recording method triggered by composite threshold in photovoltaic power station |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109375065A (en) * | 2018-12-12 | 2019-02-22 | 长沙理工大学 | Travelling wave identification method and positioning device based on three-dimensional grey absolute correlation degree |
| CN109617001A (en) * | 2018-12-28 | 2019-04-12 | 广西电网有限责任公司防城港供电局 | A kind of multi-source heterogeneous information intelligent processing system of relay protection |
| CN109617001B (en) * | 2018-12-28 | 2021-03-30 | 广西电网有限责任公司防城港供电局 | Relay protection multi-source heterogeneous information intelligent processing system |
| CN113128153A (en) * | 2021-04-20 | 2021-07-16 | 合肥工业大学 | Active frequency conversion fault recording method triggered by composite threshold in photovoltaic power station |
| CN113128153B (en) * | 2021-04-20 | 2022-08-30 | 合肥工业大学 | Active frequency conversion fault recording method triggered by composite threshold in photovoltaic power station |
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| CN108429245B (en) | 2019-10-29 |
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