CN104297628B - The section fault detection of the power distribution network containing DG and localization method - Google Patents
The section fault detection of the power distribution network containing DG and localization method Download PDFInfo
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- CN104297628B CN104297628B CN201410410035.2A CN201410410035A CN104297628B CN 104297628 B CN104297628 B CN 104297628B CN 201410410035 A CN201410410035 A CN 201410410035A CN 104297628 B CN104297628 B CN 104297628B
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
A kind of section fault detection of power distribution network containing DG and localization method, the three-phase current information collected using protection device mount point at two end node of section, using Clarke transform, three-phase current is changed into Clarke α, β mould electric current, Clarke α, β mould electric current obtains Clarke α through Fourier transformation, the phase angle of β mould electric current, and phase-angle data is uploaded relay protection and control center, relay protection and control is centrally through Clarke α for calculating each section, the phase angle difference of β mould electric current, can be when power system be broken down, by comparing Clarke α of each section, the absolute value of the phase angle difference of β mould electric current and the relation of threshold value, detect and be out of order and find out trouble point place section, fault section is cut off in time to complete protection act.The present invention can be used for the section fault detection of the power distribution network containing distributed power source under high permeability and positioning.
Description
Technical field
The present invention relates to a kind of fault detection and location method of the power distribution network containing DG.
Background technology
The fault detection and location of power distribution network is the important component part of power distribution network relay protection of power system, to power distribution network
Safe operation have great significance, be the important guarantee for realizing power distribution network self-healing, can be after power distribution network breaks down timely
Cut off fault zone so that the scope affected by fault by whole system is minimum.With the development of distributed generation technology, increasingly
Many distributed power sources (Distributed Generators, DG) access power distribution network, cause the change of power distribution network network structure
And fault current amplitudes and the change in direction, problems are brought to the relay protection of power distribution network, such as there is the inspection of fault
Surveying blind area, relay protection cannot cooperation etc. so that the traditional over-current protection method of power distribution network can not meet relay protection
Require.
Chinese invention patent 201210532103.3 discloses a kind of joining containing DG based on impedance model short trouble feature
Electric network fault interval decision method, sets up the asymmetrical three-phase impedance model of power distribution network containing DG, analyzes and extract the impedance of distribution containing DG
Short circuit current fault signature under model is carried out the degree of accuracy of fault location and easily receives as the index for judging fault section, the method
Electric network composition change causes the impact that system equiva lent impedance changes, and does not have adaptivity, it is impossible to cater to sending out for intelligent distribution network
Exhibition trend.
Chinese invention patent 201310579589.0 discloses a kind of power distribution network 10kV feeder fault based on matrix operation
Localization method, the method rely on feeder terminal unit (Feeder Terminal Unit, FTU) the collection electric current at node
Information, the path matrix to power system enter row operation and correction, obtain fault judgment matrix, fault zone is judged,
But it is according to short-circuit current value that the method carries out fault verification, easily forms the dead band of fault detect, electricity under high DG permeability
DG switching in net is likely to result in the erroneous judgement of fault, and the method is higher to communicating requirement, can when communication occurs error code or fault
The method error can be caused even to fail.
N.Perera；A.D.Rajapakse et al. exists《IEEE TRANSACTIONS ON POWER DELIVERY》2008
Written by the 4th phase of volume 23 year《Isolation of Faults in Distribution Networks With
Distributed Generators》Fault is detected using the method for comparing wavelet coefficient signs and positioned, although adopted
Multiscale analysis is carried out with Wavelet Transform and can obtain good fault detection sensitivity and accurate section positioning, but adopt
The impact that POWER SYSTEM STATE change in the case of non-faulting cannot being avoided with the method is brought to the fault detect degree of accuracy, this
Outward, the tediously long complexity of wavelet algorithm, the sample rate to hardware have high demands, and deployment cost is very high, are difficult to realize.
Mostly current detection and positioning both at home and abroad for the electric power system fault containing distributed power source is to be saved using each
At point, the voltage of measurement point acquisition, current information, obtain the judgement information of the amplitude amount based on node after processing further,
By being contrasted with the threshold value for setting, the judgement of fault and the positioning of section is carried out, electric power cannot be avoided using such method
The impact that temporal variations in the case of system non-faulting are produced to fault detecting and positioning method, does not have preferable adaptivity；
The electrical power distribution network fault location method containing DG for obtaining is improved based on traditional over-current protection method, with strong points, do not have
Extensive versatility and adaptivity, once electric network composition or state change, are likely to result in the failure of fault location algorithm；
Although using differential current protection method with certain effect, actual disposition high cost, the current information of communications is
Vector, the amplitude comprising electric current and direction, higher for relay protection communication bandwidth requirement.
In sum, the actual need of complete self-healing are realized in the face of the generating of distributed power source large-scale grid connection and intelligent grid
Ask, still need to a kind of more rapidly and effectively fault detect and localization method.
Content of the invention
Present invention aims to the fault detection and location of the existing power distribution network containing distributed power source is present
The not enough problem of adaptivity, propose section fault detection and the localization method of a kind of power distribution network containing DG.The present invention is permissible
The power distribution network containing distributed power source is made under multiple running statuses, such as：The switching of distributed power source, the change of load, realize
Quickly, reliable section fault detection and accurate fault location, so as to cut off fault section, it is ensured that the safety of power system
Stable operation.
The technical solution used in the present invention is：
The section fault detection of power distribution network of the present invention containing DG and localization method, using Clarke transform, by three-phase current
It is changed into Clarke α, β mould electric current.By phase angle difference respectively to Clarke α, the β mould electric current of power system section in non-faulting
Analysis in situation and failure condition, draws under conditions of power system is for non-purely resistive system, in conjunction with Clarke α, β mould electricity
The phase angle difference of stream, can rapidly, reliably detect various types of electric power system faults：Singlephase earth fault, two-phase phase
Between fault, double earthfault, three-phase phase-to phase fault, three-phase ground fault, and can accurately find out fault section.Judge
According to being：When the absolute value of the phase angle difference of Clarke α, the β mould electric current of power system section is 0 °, then judge in the section
Without fault；When in the phase angle difference of Clarke α, the β mould electric current of power system section, the absolute value of any one is more than 0 °, then
Judge to break down in the section, and trouble point is located in the section.The present invention can fast and effectively detect power system
Fault in section simultaneously being capable of accurate positioning failure section.
The section fault detection of power distribution network of the present invention containing DG proposes the definition of the phase angle difference of electric current with localization method.
For power system, any one power system all can be arbitrarily divided into n+1 part, wherein, n by n node>
0 and n is integer.Any two in power system is made to differ the power train that the part between node is referred to as between the two nodes
System section.If the current phase angle at node x is θ (x), wherein x=1,2 ..., n, if n →+∞, it is believed that θ (x) is power train
The current phase angle function of system, and be radially continuous in the power system.Therefore, positioned at arbitrary two nodes for differing
The phase angle difference of the electric current of the power system section between i, j may be defined as the difference of the current phase angle at node i, j, its expression formula
For：Δ θ (i, j)=θ (i)-θ (j), in formula：I, j are two nodes for differing, i>0, j>I, and i, j are integer, θ (x)
For the current phase angle at node x, x=1,2 ..., n.
Make the three-phase current at nodeFor：
Clarke transform mathematic(al) representation is：
Therefore, the three-phase current information to collecting at node does Clarke transform, obtains Clarke α, β mould electric current Have：
If crane clarke α, β mould electric currentIt is expressed as：
Then there is equation：
Clarke α, β mould electric current can be drawn by two above equationCorresponding phase angle thetaα、θβExpression formula：
To Clarke α mould electric currentPhase angle thetaαIt is analyzed, when power system is for, under three-phase equilibrium state, havingTherefore have：
Therefore, under three-phase equilibrium state, no matter electric power system fault whether, has θα=θASet up, i.e.,：Equal three
Under weighing apparatus state, Clarke α mould current phase angle is equal with A phase current phase angle.
When power system is for non-purely resistive system, i.e., when the equivalent reactance value of power system is 0, respectively to power system
The phase angle difference of Clarke α, the β mould electric current of section, in non-faulting situation with failure condition, is analyzed as follows：
Under non-faulting state, for Clarke α mould electric currentThere is the phase angle of the Clarke α mould electric current of power system section
Difference DELTA θα=0 ° of establishment；If A phase fault, the current amplitude I of A phaseAAnd phase angle thetaACan change, by phase angle thetaαTable
Reach formula to understand, the phase angle theta of Clarke α mould electric current during faultαF≠θα, and when faulty power system section Clarke α mould
Phase angle difference DELTA θ of electric currentαF≠Δθα=0 °；If only B phase or C phase singlephase earth fault, or B, C double earthfault
During generation, then B phase current magnitude IB, phase angle thetaBWith C phase current magnitude IC, phase angle thetaCAccordingly can change, by phase angle thetaα's
Knowable to expression formula, the phase angle theta of Clarke α mould electric current during faultαF≠θα, and when faulty power system section Clarke α
Phase angle difference DELTA θ of mould electric currentαF≠Δθα=0 °.If B, C two-phase occurs phase-to phase fault, it is analyzed as follows：To three-phase power
System carries out equivalent analysis, using the Dai Weining principle of equal effects, will be each with the three-phase electrical power system in downstream for analyzed section upstream
The equivalent source of voltage source and impedance cascade is mutually all equivalent to, and the three-phase voltage at node i is respectivelyVoltage at node j is In analyzed section, the equiva lent impedance of each phase isIn formula：
RsFor the equivalent resistance of analyzed section, XsFor the equivalent reactance of analyzed section, B, C phase in the section is divided by trouble point
For two parts：WithAnd haveWhile the fault point between B, C phase is usedCarry out the equivalent short-circuit impedance that B, C phase fault occurs.If before fault occurs, each mutually electricity at node i, j
Flow and be：
After fault occurs, at node i, each phase current is：
After fault occurs, at node j, each phase current is：
If the power system of analyzed section upstream and downstream is the three-phase system of balance, have：
Can draw：
Therefore, the Clarke α mould electric current after being out of order according to above formula：
If phase fault impedanceThen negligible phase fault impedance, above formula can abbreviations further
For：
I.e.：When there is B, C phase fault in the power system of three-phase equilibrium, Clarke α mould electric currentPhase angle thetaαWill not occur
Change, and with A phase currentPhase angle thetaAEqual.As A phase is not fault phase, the phase angle difference of the A phase current of power system section
Value Δ θA=0 °, phase angle difference DELTA θ of the Clarke α mould electric current of power system section can be drawn furtherα=Δ θA=0 °.
Therefore, when power system section occurs B, C phase fault, using the phase angle difference DELTA of the Clarke α mould electric current of section
θαCannot detect and be out of order, this kind of failure mode is the fault detect blind area of the detection method.
To Clarke β mould electric currentPhase angle thetaβIt is analyzed, by phase angle thetaβExpression formula can draw：With B phase or C phase
Related Arbitrary Fault form can all cause θβChange, and have the phase angle of the Clarke β mould electric current of power system section
Difference DELTA θβ≠0°.There is no the fault for associating with B phase or C phase is A phase earth fault, is analyzed as follows：To three-phase electrical power system
Equivalent analysis are carried out, using the Dai Weining principle of equal effects, analyzed section upstream is each mutually equal with the three-phase electrical power system in downstream
The equivalent source of voltage source and impedance cascade is equivalent to, the three-phase voltage at node i is respectively Voltage at node j is In analyzed section, the equiva lent impedance of each phase isIn formula：RsFor analyzed section
Equivalent resistance, XsFor the equivalent reactance of analyzed section, the A phase in section is divided into two parts by trouble point：With
And haveWhile the fault point in A phase is usedCarry out equivalent generation A phase ground short circuit fault
Impedance ground.If before fault occurs, at node i, j, each phase current is：
After fault occurs, at node i, j, each phase current is：
Therefore, the Clarke β mould electric current after being out of order：
I.e.：When there is A phase ground short circuit in power system, Clarke β mould electric currentPhase angle thetaβWill not change.Due to B
Phase and C phase are not fault phase, haveAnd have B, C phase of power system section
Phase angle difference DELTA θ of electric currentB=Δ θC=0 °, the phase angle difference of the Clarke β mould electric current of power system section can be drawn further
Value Δ θβ=0 °.Therefore, when power system section occurs A phase earth fault, using the phase angle of the Clarke β mould electric current of section
Difference DELTA θβCannot detect and be out of order, this kind of failure mode is the fault detect blind area of the detection method.
In sum：Under conditions of power system is for non-purely resistive system, in conjunction with the phase angle difference of Clarke α, β mould electric current
Value, can rapidly, reliably detect various types of electric power system faults：Singlephase earth fault, two-phase phase-to phase fault, two-phase
Earth fault, three-phase phase-to phase fault, three-phase ground fault, and fault section can be accurately found out, judgment basis are：Work as electricity
The absolute value of the phase angle difference of Clarke α, the β mould electric current of Force system section is 0 °, then judge in the section without fault；When
In the phase angle difference of Clarke α, the β mould electric current of power system section, the absolute value of any one is more than 0 °, then judge the section
Inside break down, and trouble point is located in the section.
In actual applications, can be by arranging threshold kΔθ, wherein KΔθ＞ 0, to carry out the judgement of fault, i.e.,：Work as electric power
The absolute value of the phase angle difference of Clarke α, the β mould electric current of system section is respectively less than equal to threshold kΔθWhen, judge do not have in the section
Faulty；When in the phase angle difference of Clarke α, the β mould electric current of power system section, any one absolute value is more than threshold kΔθ
When, judge to break down in the section, and trouble point is located in the section.
The present invention proposes a kind of section fault inspection of power distribution network containing DG based on Clarke electric current modulus phase angle difference value
Survey and localization method, compared with prior art, the good effect that the method can be generated by is：First, the present invention can be used to contain and divide
Section fault detection and the positioning of the power distribution network of cloth power supply, can quickly, reliably detect and accurate positioning failure, be suitable for
In various faults：Singlephase earth fault, two-phase phase-to phase fault, double earthfault, three-phase phase-to phase fault, three-phase ground fault
Detection and positioning, the detection positioning for multiple independent failures are still effective, there is no the check frequency of fault；Next, this
Bright can normal in the temporal variations in the case of power system non-faulting, effectively run work, do not receive all kinds of non-faulting shapes
State changes, such as：The switching of distributed power source, the impact of the change of load, with good adaptivity；Finally, the present invention is former
Reason is simple, it is adaptable to focusing on for POWER SYSTEM STATE information, relatively low to communication bandwidth requirement, and the process of concentration and control
Be conducive to the cooperation of relay protection.
Description of the drawings
The present invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
Fig. 1 is power system equivalent analysis figure；
Fig. 2 is the general principle figure of the three-phase electrical power system for applying the present invention；
Fig. 3 is the structured flowchart of the specific embodiment of the present invention；
Fig. 4 is the flow chart for realizing the inventive method.
Specific embodiment
Fig. 1 is power system equivalent analysis figure.As shown in figure 1, AC power 101 is located at the upstream of power system, entirely
Equivalent power system is arbitrarily divided by n+1 node, wherein containing n equivalent section 102, and 102 two ends of equivalent section
Node be respectively i, j, wherein, n>0 and n is integer.Current phase angle at each node is θ (x), wherein x=1,2 ..., n+
1, if n →+∞, it is believed that θ (x) is the current phase angle function of power system, and is radially continuous in the power system.Cause
This, phase angle difference DELTA θ of the electric current of the equivalent section 102 of the power system between arbitrary two node i for differing, j
(i, j) may be defined as the difference of the current phase angle at node i, j, and its expression formula is：Δ θ (i, j)=θ (i)-θ (j), in formula：i、j
For two nodes for differing, i>0, j>I, and i, j are integer, θ (x) is the current phase angle at node x, x=1,2 ..., n.
Fig. 2 is the general principle figure of the three-phase electrical power system for applying the present invention.As shown in Fig. 2 being located at analyzed section 203
The power system of upstream and the power system in downstream are by equivalently represented for equivalent both upstream power system 201 and equivalent downstream power system
System 202, is equivalent three-phase voltage source.Analyzed section 203 is the power system section between node i, j, and quilt
Three-phase current information collecting device is each equipped with the node i at analysis 203 two ends of section, j, at acquisition node i that can be synchronous
Three-phase current information and node j at three-phase current information, carat of the three-phase current information at two nodes at node i
Gram conversion and node j at Clarke transform, obtain Clarke α, the β mould electric current at node i and Clarke α, β at node j
Mould electric current.Fourier transformation (Fourier Transform) by Clarke α, the β mould electric current at two nodes at node i
With the Fourier transformation at node j, the carat at Clarke α, β mould current phase angle information and the node j at node i can be obtained
Gram α, β mould current phase angle information, and then can be by Clarke α, the β mould electric current phase at 203 liang of end nodes of analyzed section
Angle is poor, draws phase angle difference, the phase angle difference of Clarke β mould electric current of the Clarke α mould electric current of analyzed section 203, so
Pass through the absolute value of the phase angle difference of Clarke α, β mould electric current and the threshold k for setting afterwardsΔθRelatively, show that fault verification is tied
Really.
As shown in figure 3, local measurement and data processing equipment 301 is configured with each node of power system, in order to
Gather and measure each phase current information.Local measurement utilizes Clarke transform with data processing equipment 301, can be by the three-phase of collection
Current information is changed into Clarke α, β mould current information.Local measurement utilizes Fourier transformation, general gram with data processing equipment 301
Clarke α, the β mould current information that clarke conversion is obtained is changed into Clarke α, β mould current phase angle information.At local measurement and data
Reason device 301 sends the data of Clarke α, β mould current phase angle in real time by communication link to relay protection and control center 302,
Relay protection and control center 302 is provided with data storage device, preserves the information that each node is uploaded in the same time, constitutes power system
State information matrix, relay protection and control center 302 calculate the phase angle difference of the Clarke α mould electric current of each section and Clarke
The phase angle difference of β mould electric current, finds out fault section by section fault detection and the localization method of the power distribution network containing DG, and relay is protected
Protective relaying device at shield control centre 302 node i immediately to the section two ends of fault, j sends protection signal, cuts
Section except fault, it is ensured that the safety of power system.
The section fault detection of the power distribution network containing DG of the present embodiment and localization method to realize step as follows：
Step one, local measurement and data processing equipment 301 by configuring at each node, collection three-phase current are believed
Breath, using Clarke transform, three-phase current information is changed into Clarke α, β mould current information；
Step 2, Clarke α, the β mould current information for obtaining Clarke transform, through Fourier transformation, obtain carat
Gram α, β mould current phase angle；
Step 3, by the data of Clarke α, β mould current phase angle through communication links relay protection and control center 302；
Step 4, relay protection and control center 302 read from data storage device current time power system each
The status information of node, and the POWER SYSTEM STATE information matrix of current time is generated, calculate the Clarke α mould of each section
The phase angle difference of electric current and the phase angle difference of Clarke β mould electric current；
Step 5, according to following criterion, fault detection and location is carried out to all of power system section：If a certain electric power
The absolute value of the phase angle difference of the phase angle difference of the Clarke α mould electric current of system section and Clarke β mould electric current is respectively less than and is equal to
Threshold kΔθWhen, then the section normally runs；If the phase angle difference of the Clarke α mould electric current in certain unified power system section, carat
In the phase angle difference of gram β mould electric current, the absolute value of any one is more than threshold kΔθWhen, then break down in the section, and fault
Point is in the section；
Step 6, relay protection and control center 302 record the fault section label that judges, at the same time, relay protection
Control centre 302 sends actuating signal to the protection device at the node i at the section two ends of fault, j, cuts off the section of fault,
Complete protection.
The flow chart that Fig. 4 realizes the inventive method for relay protection and control center 302.As shown in figure 4, relay protection and control
Comprising Initialize installation module 401 and power system real-time fault detection and locating module 402, power system is real-time at center 302
Phase angle difference calculating module 403, section fault comprising data input with each electric current modulus in fault detection and location module 402
Detection and locating module 404 and comprehensive judgment module 405.Wherein, section fault detection with locating module 404 in a certain electric power
The algorithm that the phase angle difference, the phase angle difference of Clarke β mould electric current of the Clarke α mould electric current of system section is detected and judged
Using serial design, using the phase angle difference of Clarke α mould electric current as main detection limit, the phase angle difference of Clarke β mould electric current is made
For the detection limit for aiding in, so list can be effectively ensured while algorithm complex and the requirement to hardware device is reduced
The quick detection of phase earth fault, this be as in power system, most fault is all singlephase earth fault, and all of
Singlephase earth fault all can be detected using the phase angle difference of Clarke α mould electric current, and adopts the phase of Clarke β mould electric current
There is the blind area of detection when there is A phase earth fault in angular difference value.
The operational process of Initialize installation module 401 is：
Flow process one, carry out Initialize installation；
Flow process two, enter line label to each node of power system and section, numbering is the section two of N wherein in power system
The node at end is respectively i, j, wherein, N>0 and N is integer, i>0 and i is integer, j>I and j are integer, subsequently into power train
The phase angle difference calculating module 403 of the data input in system real-time fault detection and locating module 402 and each electric current modulus.
Data input with the operational process of the phase angle difference calculating module 403 of each electric current modulus is：
Clarke α, β mould current phase angle information at flow process one, input each node of current time；
Flow process two, set up POWER SYSTEM STATE information matrix；
Flow process three, calculate each section Clarke α, β mould electric current phase angle difference, then make power system segment number N
=1, enter section fault detection and locating module 404.
Section fault detects that the operational process with locating module 404 is：
Flow process one, judge section N Clarke α mould electric current phase angle difference absolute value whether more than threshold kΔθIf,
It is then to enter flow process three, if it is not, then entering flow process two；
Flow process two, judge section N Clarke β mould electric current phase angle difference absolute value whether more than threshold kΔθIf,
It is then to enter flow process three, if it is not, then entering comprehensive judgment module 405；
Break down inside flow process three, judgement section N；
Flow process four, record fault section label N and the section two ends corresponding nodal scheme i, j；
Flow process five, to the protective relaying device sending action signal at the node i at section N two ends, j；
Flow process six, output：Break down inside section N, subsequently into comprehensive judgment module 405.
The operational process of comprehensive judgment module 405 is：
Flow process one, judge that power system segment number N, whether less than section sum, if so, then enters flow process two, if it is not, then
Enter flow process three；
Flow process two, execution N=N+1, execute section fault detection and the program in locating module 404 to next section；
Flow process three, judging each section of power system whether all fault-free, if so, then flow process four being entered, if it is not, then entering
Flow process five；
Flow process four, judge each section fault-free of power system, subsequently into the phase angle difference of data input and each electric current modulus
Value computing module 403；
Flow process five, judgement power system section N1、N2..., Nn fault export fault detection and location result, Ran Houjin
Enter the phase angle difference calculating module 403 of data input and each electric current modulus.
Claims (8)
1. a kind of section fault of power distribution network containing DG is detected and localization method, it is characterised in that by power system section two ends
The difference of the current phase angle at node is defined as the phase angle difference of electric current；Three-phase current information is changed into by carat using Clarke transform
Gram α, β mould current information；Under conditions of power system is for non-purely resistive system, when the Clarke α mould electricity of power system section
The phase angle difference of stream is 0 ° with the absolute value of the phase angle difference of Clarke β mould electric current, then judge do not have in the power system section
Faulty；In phase angle difference, the phase angle difference of Clarke β mould electric current when the Clarke α mould electric current of power system section arbitrarily
The absolute value of one is more than 0 °, then judge to break down in the power system section, and trouble point is located at the power system section
Interior；
Described power system section is defined as：Power system is arbitrarily divided into using n node for n+1 part, n>0,
And n is integer, makes any two in power system differ the power train that the part between node is referred to as between the two nodes
System section.
2. the section fault of the power distribution network containing DG according to claim 1 is detected and localization method, it is characterised in that in reality
In the application of border, by arranging threshold kΔθ, to carry out the judgement of fault, wherein KΔθ＞ 0, i.e.,：Clarke when power system section
The phase angle difference of α mould electric current is respectively less than equal to threshold k with the absolute value of the phase angle difference of Clarke β mould electric currentΔθWhen, judging should
Without fault in power system section；Phase angle difference, Clarke β mould electric current when the Clarke α mould electric current of power system section
Phase angle difference in the absolute value of any one be more than threshold kΔθWhen, judge to break down in the power system section, and fault
Point is in the power system section.
3. the section fault of the power distribution network containing DG according to claim 1 is detected and localization method, it is characterised in that described
The power distribution network containing DG section fault detection and localization method to realize step as follows：
Step one, local measurement and data processing equipment (301) by configuring at each node, collection three-phase current information,
Using Clarke transform, three-phase current information is changed into Clarke α, β mould current information；
Step 2, Clarke α, the β mould current information for obtaining Clarke transform, through Fourier transformation, obtain Clarke α, β
Mould current phase angle；
Step 3, by the data of Clarke α, β mould current phase angle through communication links relay protection and control center (302)；
Step 4, relay protection and control center (302) read each section of power system of current time from data storage device
The status information of point, and generate the POWER SYSTEM STATE information matrix of current time, calculate each power system section gram
The phase angle difference of clarke α mould electric current and the phase angle difference of Clarke β mould electric current；
Step 5, according to following criterion, fault detection and location is carried out to all of power system section：If certain unified power system
The absolute value of the phase angle difference of the phase angle difference of the Clarke α mould electric current of section and Clarke β mould electric current is respectively less than equal to threshold value
KΔθWhen, then the power system section normally runs；If the phase angle difference of the Clarke α mould electric current in certain unified power system section,
In the phase angle difference of Clarke β mould electric current, the absolute value of any one is more than threshold kΔθWhen, then occur in the power system section
Fault, and trouble point is in the power system section；
The fault power system sector label that step 6, relay protection and control center (302) record are judged, at the same time, continues
Electric protection control centre (302) sends actuating signal to the protection device at the node i at the power system section two ends of fault, j,
The power system section of fault is cut off, completes protection.
4. the section fault of the power distribution network containing DG according to claim 3 is detected and localization method, it is characterised in that relay
Protection control centre (302) is comprising Initialize installation module (401) and power system real-time fault detection and locating module
(402), power system real-time fault detection and the phase angle difference comprising data input with each electric current modulus in locating module (402)
Computing module (403), section fault detection and locating module (404) and comprehensive judgment module (405)；Wherein, section fault inspection
Survey with to the phase angle difference of the Clarke α mould electric current of power system section, the phase of Clarke β mould electric current in locating module (404)
Angular difference value is detected and the algorithm that judged adopts serial design, using the phase angle difference of Clarke α mould electric current as main detection limit,
The phase angle difference of Clarke β mould electric current is used as the detection limit of auxiliary.
5. the section fault of the power distribution network containing DG according to claim 4 is detected and localization method, it is characterised in that initial
Change setup module (401) operational process be：
Flow process one, carry out Initialize installation；
Flow process two, enter line label to each node of power system and section, numbering is the power system area of N wherein in power system
The node at section two ends is respectively i, j, wherein, N>0 and N is integer, i>0 and i is integer, j>I and j are integer, subsequently into electricity
The phase angle difference calculating module of the data input in Force system real-time fault detection and locating module (402) and each electric current modulus
(403).
6. the section fault of the power distribution network containing DG according to claim 4 is detected and localization method, it is characterised in that data
It is input into and with the operational process of the phase angle difference calculating module (403) of each electric current modulus is：
Clarke α, β mould current phase angle information at flow process one, input each node of current time；
Flow process two, set up POWER SYSTEM STATE information matrix；
Flow process three, calculate each power system section Clarke α, β mould electric current phase angle difference, then make power system section
Number N=1, enters section fault detection and locating module (404).
7. the section fault of the power distribution network containing DG according to claim 4 is detected and localization method, it is characterised in that section
The operational process of fault detection and location module (404) is：
Flow process one, judge power system section N Clarke α mould electric current phase angle difference absolute value whether more than threshold kΔθ,
If so, then flow process three is entered, if it is not, then entering flow process two；
Flow process two, judge power system section N Clarke β mould electric current phase angle difference absolute value whether more than threshold kΔθ,
If so, then flow process three is entered, if it is not, then entering comprehensive judgment module (405)；
Break down inside flow process three, judgement power system section N；
Flow process four, record fault power system sector label N and the power system section two ends corresponding nodal scheme i, j；
Flow process five, to the protective relaying device sending action signal at the node i at power system section N two ends, j；
Flow process six, output：Break down inside power system section N, subsequently into comprehensive judgment module (405).
8. the section fault of the power distribution network containing DG according to claim 4 is detected and localization method, it is characterised in that comprehensive
The operational process of judge module (405) is：
Flow process one, judge that power system segment number N, whether less than power system section sum, if so, then enters flow process two, if
No, then enter flow process three；
Flow process two, execution N=N+1, execute to next power system section in section fault detection and locating module (404)
Flow process；
Flow process three, judging each power system section whether all fault-free, if so, then flow process four being entered, if it is not, then entering flow process
Five；
Flow process four, judge each equal fault-free of power system section, subsequently into the phase angle difference of data input and each electric current modulus
Value computing module (403)；
Flow process five, judgement power system section N1、N2、…、Nn-1Fault simultaneously exports fault detection and location result, subsequently into number
According to the phase angle difference calculating module (403) being input into each electric current modulus.
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| CN104297629B (en) * | 2014-08-19 | 2017-09-12 | 中国科学院电工研究所 | The section fault detection of power distribution network containing distributed power source and localization method |
| CN105676075B (en) * | 2016-03-25 | 2018-07-24 | 国家电网公司 | A kind of power distribution network traveling wave fault positioning method based on multiterminal data |
| CN105759173B (en) * | 2016-03-31 | 2018-05-08 | 中国科学院电工研究所 | The adaptive failure Section Location of power distribution network containing distributed generation resource |
| CN106154111B (en) * | 2016-06-22 | 2018-09-11 | 南京南瑞继保电气有限公司 | A kind of m-Acetyl chlorophosphonazo occurring source localization method and device |
| CN106941252B (en) * | 2017-01-09 | 2019-04-05 | 湖南大学 | It is not required to the guard method of distribution feeder containing DG of voltage |
| CN107064736B (en) * | 2017-03-22 | 2019-04-09 | 华南理工大学 | A kind of Fault Locating Method connecing inverse distributed power power distribution network containing more T |
| CN112041693B (en) * | 2018-05-07 | 2023-10-17 | 美国映翰通网络有限公司 | Power distribution network fault positioning system based on mixed wave recording |
| CN115308536B (en) * | 2022-09-29 | 2022-12-20 | 西华大学 | Mu PMU-based DG-containing power distribution network fault section identification method |
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