CN106646130A - Active power distribution network fault positioning method and system based on current polarity comparison - Google Patents
Active power distribution network fault positioning method and system based on current polarity comparison Download PDFInfo
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- CN106646130A CN106646130A CN201611162360.7A CN201611162360A CN106646130A CN 106646130 A CN106646130 A CN 106646130A CN 201611162360 A CN201611162360 A CN 201611162360A CN 106646130 A CN106646130 A CN 106646130A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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
The invention relates to an active power distribution network fault positioning method based on current polarity comparison. Each detection point of an active power distribution network feed line is provided with a switch and an FTU, the FTUs are in information interaction via communication network. The FTUs detect the fault current in real time, the current abrupt change time is taken as the fault starting point, the fault current signal of half cycle after the fault is recorded, the polarity is calculated according to the data of the half cycle, and the fault positioning is realized by comparing the polarity of the fault current of the adjacent detection points. In addition, when the fault positioning credibility is low and missed reporting occurs, the data detected at the downstream replaces the detection point data to realize the fault positioning, so that the method has a certain fault tolerance capability. The high-precision fault positioning of the active power distribution network including a distributed power supply can be realized, and the rapid fault positioning can be realized as well, so that the requirement of the active power distribution network can be met. The method further supports the power distribution network of the high-permeability distributed power supply, and facilitates the promotion of energy saving and emission reduction and smart grid construction.
Description
Technical field
The invention belongs to the technical field of power system feeder line fault positioning, more particularly to it is a kind of based on current polarity
Active distribution network Fault Locating Method relatively and system.
Background technology
In power system, failure it is quick, to be accurately positioned be a very important link, to ensure power system
Normal operation and then reduction system System average interruption duration index.
With a large amount of distributed power sources (Distributed Generation, DG) access power distribution network, the planning of power distribution network,
The link such as operation and control has become the hot issue of intelligent distribution network.Actively planning, active management can be realized and actively controlled
The active distribution network technology of the functions such as system is undoubtedly the new approaches for solving these problems.Active distribution network is by original containing single electricity
Power and the active electric network of fault current two-way flow, cause traditional when the radial networks in source become a normal operation
Protection and control method failure.Active distribution network requires the confession for realizing Fault Isolation and non-faulting region rapidly when breaking down
Electricity recovers, and realizes that the premise of Fault Isolation and service restoration is fault location, therefore, research active distribution network fault location tool
There is important meaning.
Traditional Fault Locating Method mainly has impedance method, electric current than width method, specific current phase method, traveling wave method and intellectuality side
Method etc..Impedance method is larger by such environmental effects due to the impedance of power distribution network, and fault location precision is limited.Electric current is only fitted than width method
For the conventional electrical distribution net without distributed power source, fail in active distribution network.Although specific current phase method is applied to containing distribution
The power distribution network of formula power supply, however it is necessary that there is voltage transformer to coordinate, and does not typically install mutual induction of voltage on power distribution network feeder line
Device, it is impossible to be applied to active distribution network.Although traveling wave method is not affected by distributed power source, wavefront identification is relatively stranded
It is difficult.Intelligentized method improves fault location using intelligent algorithms such as genetic algorithm, particle swarm optimization algorithm and neutral nets
Search speed and fault-tolerant ability, but it is not suitable for the active distribution network containing distributed power source.
There is ca bin (Feeder Terminal Unit, FTU) in conventional electrical distribution net, but FTU is only realized
The data for collecting are uploaded to control centre by the function of its data acquisition, FTU, and by control centre information processing and intelligence are carried out
Decision-making, is analyzed in the heart judges to realize the identification to line fault in power distribution network and positioning in the controlling, and FTU is according in control
The instruction of the heart carries out the isolation of failure.FTU does not have active control function in conventional electrical distribution net, but comprising distributed power source
Active distribution network requires that distribution terminal and power consumer are actively engaged in the management and control of electrical network, it is desirable to which FTU has active control
Function, realizes fault location and Fault Isolation.
The content of the invention
The present invention overcomes traditional Fault Locating Method to be applied to containing distributed power source to solve the above problems
Active distribution network in, or traditional Fault Locating Method fault location precision during active distribution network is applied to it is low, know
A kind of problem that is not difficult, needing extra installation equipment, there is provided active distribution network fault location side compared based on current polarity
Method and system.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of active distribution network Fault Locating Method compared based on current polarity, methods described step is included：
(1) phase current and zero-sequence current of the FTU real-time detection feeder lines of each test point of active distribution network feeder line, described in each
FTU judges whether the test point occurs event according to its continuous phase current values of three samplings and the variable quantity of zero-sequence current successively
Barrier；
If it is, startup separator positioning, into step (2)；If not, fault location result is nothing, into step (6)；
(2) current signal of half cycle that the FTU records of failure starting point start from failure initial time, other detections
The FTU of point carries out data syn-chronization using the failure initial time of failure starting point FTU as data starting point, records half cycle
Current signal；
(3) FTU of each test point is respectively according to the current signal calculating current polarity number of its half cycle for recording；
(4) light from active distribution network feeder line starting, each test point FTU obtains successively the downstream inspection adjacent with this test point
The current polarity value that measuring point FTU is calculated, and calculate the current polarity value and detected downstream point current polarity value of this test point
Difference, and this test point is judged according to the absolute value of the difference of the current polarity value and be whether between test point downstream therefore
Barrier section；
(5) in the fault section judged in calculation procedure (4) test point confidence level, carry out when confidence level is relatively low therefore
Barrier positioning fault-tolerant processing, obtains fault location result；
(6) fault location result is sent to control centre.
Preferably, step (1) concretely comprises the following steps：
(1-1)：Judge the system type of active distribution network：If the active distribution network is small current neutral grounding system, enter
Step (1-2)；If the active distribution network is heavy current grounding system, into step (1-4)；
(1-2)：The phase current and zero-sequence current of the FTU real-time detection feeder lines of each test point；
(1-3)：The FTU of each test point judges whether the failure that is short-circuited according to phase current fault location start-up criterion；Respectively
The FTU of test point judges whether low current grounding according to zero-sequence current fault location start-up criterion；Into step (1-
6)；
(1-4)：The phase current of the FTU real-time detection feeder lines of each test point；
(1-5)：The FTU of each test point judges whether the failure that is short-circuited according to phase current fault location start-up criterion；
(1-6)：If it is, startup separator positioning, into step (2)；If not, fault location result is nothing, into step
Suddenly (6).
Preferably, the basis for estimation of the small current neutral grounding system is that the active distribution network is neutral non-effective grounding
System, the basis for estimation of the heavy current grounding system is that the active distribution network is solidly earthed neutral system.
Preferably, in order to avoid interference signal error starting fault location, it is positioned in startup separator in the step (1-6)
The front result to step (1-3) and step (1-5) is verified, if faulted phase current virtual value IkpMore than or equal to phase current event
Barrier safety factor KekpWith phase current virtual value I during system failurepProduct, it is determined that there occurs short trouble；If failure
Zero-sequence current virtual value Ik0More than or equal to zero-sequence current failure safety factor Kek0It is effective with out-of-balance current during system failure
Value IunProduct, it is determined that there occurs low current grounding；
Ikp≥KekpIp, wherein, Kekp=2～3；
Ik0≥Kek0Iun, wherein, Kek0=2～3.
Preferably, the faulted phase current virtual value IkpComputing formula be：
Wherein, ipK () is the phase current instantaneous value of k-th test point of failure phase；N is half cycle
Sampling number；
The failure zero-sequence current virtual value Ik0Computing formula be：
Wherein, i0K () is the zero-sequence current instantaneous value of k-th test point of failure zero-sequence current；N is
The sampling number of half cycle.
Preferably, the current polarity value in the step (3) represents the polarity of each test point electric current, and polarity number is half week
The number of positive sampled value or negative sampled value in ripple fault-current signal；
When for positive sampled value when, be judged as positive pole；
When to bear sampled value, it is judged as negative pole；
When half cycle data has zero crossing, i.e., existing positive sampled value has negative sampled value again in half cycle, if just
Sampled value number and negative sampled value number cannot relatively, then judge its polarity；
Therefore, the present invention only calculates failure starting sample point to the positive sampled value or negative sampled value between zero passage sampled point
Number, and as the polarity number of the test point.Collection half cycle fault current data in not only there is positive sampled value but also
When there is negative sampled value, only be there is no into half cycle as its polarity number in initial positive sampled value or initial negative sampled value
Interior positive sampled value and negative sampled value number relatively when cannot judge its polarity problems.
The specific formula for calculation of current polarity value PO：
Wherein, PO is test point polarity number；Sign (x) is sign function；I (k) is k-th sampled value of fault current；M
For the starting sample point sequence number that fault current passes through zero point in half cycle；N is the sampling number of half cycle.
Preferably, in the step (4), difference DI of the current polarity value is current polarity value PO of this test pointup
Subtract current polarity value PO of adjacent downstream test pointdown；
DI=POup-POdown；
It is described be judged as fault section concrete criterion be：The absolute value of difference DI of the current polarity value is more than or equal to
Safety factor krelWith product T of threshold valueh；
|DI|≥krelTh；
Wherein, when fault current does not pass through zero point in half cycle, Th=N；When fault current is in half cycle
When passing through zero point, Th=M；krelTake 0.5～0.8.
Preferably, in the step (5), confidence level F of the test point is current polarity reliability function FAAnd polarity
Relatively reliability function FPSum.
When the test point confidence level F be more than or equal to 0.5 when, then confidence level is higher, i.e., described test point with it is adjacent under
It is defined as fault section between trip test point, while the FTU of the test point sends its fault location result to being adjacent
Detected downstream point FTU；
When confidence level F of the test point is less than 0.5, then confidence level is relatively low, and the test point FTU to adjacent downstream is examined
The adjacent downstream test point of measuring point sends calling order, obtains its current polarity value and carries out fault section and judges straight with fault-tolerant processing
To determination fault section.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of active distribution network fault location system compared based on current polarity,
The system be using a kind of active distribution network of the active distribution network Fault Locating Method compared based on current polarity,
Including FTU and control centre, the communication module that can be carried by the FTU between each described FTU carries out data message interaction,
The FTU is communicated by the communication module for carrying with the control centre.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of active distribution network fault location system compared based on current polarity,
The system is to contain Thief zone using a kind of active distribution network Fault Locating Method compared based on current polarity
The power distribution network of rate distributed power source, including FTU and control centre, the communication that can be carried by the FTU between each described FTU
Module carries out data message interaction, and the FTU is communicated by the communication module for carrying with the control centre.
Beneficial effects of the present invention：
1st, the present invention carries out the innovation in method using every hardware module of the original FTU of power distribution network, it is adaptable to actively
Power distribution network, under the conditions of accurate fault location containing distributed power distribution network is met, is capable of achieving power distribution network fast failure positioning
2nd, the Fault Locating Method that the present invention is compared based on current polarity for three phase short circuit fault, two-phase short-circuit fault,
Low current grounding and high current earth fault can realize correct fault location.Because fault location algorithm is by feeder line
Terminal unit is realized, and only needs to gather the signal of half cycle, and polarity determination methods are again very simple, so fault location is used
When it is shorter, it is adaptable to the fast failure of active distribution network positioning.
Description of the drawings
Fig. 1 is the program flow diagram of the Fault Locating Method compared based on current polarity of the present invention；
Fig. 2 is the feeder line figure containing distributed power source of the present invention；
Fig. 3 is the active distribution network simulation model of the present invention.
Specific embodiment：
Below in conjunction with the accompanying drawings the invention will be further described with embodiment.
A kind of active distribution network Fault Locating Method compared based on current polarity, the method passes through ca bin
(FTU) real-time detection fault current, using the current break moment as failure starting point, half cycle fault current after record failure
Signal, according to the data of half cycle its polarity is calculated, and by the polarity of relatively more adjacent test point fault current, realizes that failure is determined
Position.
A kind of active distribution network Fault Locating Method compared based on current polarity, methods described step is included：
(1) phase current and zero-sequence current of the FTU real-time detection feeder lines of each test point of active distribution network feeder line, described in each
FTU judges whether the test point occurs event according to its continuous phase current values of three samplings and the variable quantity of zero-sequence current successively
Barrier；
If it is, startup separator positioning, into step (2)；If not, fault location result is nothing, into step (6)；
(2) current signal of half cycle that the FTU records of failure starting point start from failure initial time, other detections
The FTU of point carries out data syn-chronization using the failure initial time of failure starting point FTU as data starting point, records half cycle
Current signal；
(3) FTU of each test point is respectively according to the current signal calculating current polarity number of its half cycle for recording；
(4) light from active distribution network feeder line starting, each test point FTU obtains successively the downstream inspection adjacent with this test point
The current polarity value that measuring point FTU is calculated, and calculate the current polarity value and detected downstream point current polarity value of this test point
Difference, and this test point is judged according to the absolute value of the difference of the current polarity value and be whether between test point downstream therefore
Barrier section；
(5) in the fault section judged in calculation procedure (4) test point confidence level, carry out when confidence level is relatively low therefore
Barrier positioning fault-tolerant processing, obtains fault location result；
(6) fault location result is sent to control centre.
In the step (1), jump-value of current fault location start-up criterion is by real-time detection phase current and zero sequence electricity
Stream, the variable quantity of continuous three sampled values of comparison is judging whether power distribution network there occurs failure.For the fault location of phase current
Start-up criterion is：
In formula, ipK () is the phase current instantaneous value of k-th sampled point；ip(k-2N) k-th sampled point is in a Zhou Boqian
Phase current instantaneous value, the sampling number of a cycle is 2N；KepFor phase current limit coefficient, K is takenep=0.2～0.4；KipFor
Phase current proportionality coefficient, takes Kip=2～4；IpFor system failure when phase current virtual value.
For the fault location start-up criterion of zero-sequence current is：
In formula, i0K () is the zero-sequence current instantaneous value of k-th sampled point；i0(k-2N) k-th sampled point was in one week wavefront
Zero-sequence current instantaneous value, the sampling number of a cycle is 2N；Ke0For zero-sequence current limit coefficient, K is takene0=0.2～0.4；
Ki0For zero-sequence current proportionality coefficient, K is takeni0=2～4；IunFor system failure when out-of-balance current virtual value.When in satisfaction
When stating start-up criterion, k-th test point as failure starting point, is recorded the fault-current signal of half cycle after failure by FTU.
In order to avoid interference signal error starting fault location, half cycle fault-current signal to gathering is verified,
If meeting following condition, it is determined that there occurs failure, fault current Polarity comparision is carried out.
In formula：IkpIt is the phase current virtual value according to half cycle faulted phase current calculating；IpFor system failure when
Phase current virtual value；KekpFor the safety factor of phase current failure, K is takenekp=2～3；ipK () is k-th test point of failure phase
Phase current instantaneous value；N is the sampling number of half cycle；
Ik0It is the zero-sequence current virtual value according to half cycle failure zero-sequence current calculating；Kek0For zero-sequence current failure
Safety factor, takes Kekp=2～3；IunFor system failure when out-of-balance current virtual value；i0K () is failure zero-sequence current
The zero-sequence current instantaneous value of k-th test point.
In the step (3), fault current polarity calculate be by calculating half cycle fault current in positive sampled value or
The number of negative sampled value judging, when for positive sampled value when, be judged as positive pole；When to bear sampled value, it is judged as negative pole.But
It is that when half cycle data has zero crossing, i.e., existing positive sampled value has negative sampled value again in half cycle, if positive sampled value
Number and negative sampled value number cannot relatively, then judge its polarity.Therefore, only calculate failure starting sample point to adopt to zero passage
Positive sampled value or negative sampled value number between sampling point, and as the polarity of the test point.Specifically it is calculated as follows：
In formula, PO is test point polarity number；Sign (x) is sign function；I (k) is k-th sampled value of fault current；M
For the starting sample point sequence number that fault current passes through zero point in half cycle；N is the sampling number of half cycle.
In the step (4), judge whether the section occurs event according to the polarity value difference of upstream and downstream test point fault current
Barrier, its concrete criterion is as follows：
|DI|≥krelTh (7)
DI=POup-POdown (8)
In formula, DI is the polarity value difference of upstream and downstream test point fault current；POup、POdownRespectively upstream detection point-polarity
Value, detected downstream point-polarity value；ThFor threshold value, when fault current does not pass through zero point in half cycle, Th=N；When failure electricity
When stream passes through zero point in half cycle, Th=M；krelFor safety factor, k is takenrel=0.5～0.8.
In the step (5), the fault location being made up of current polarity reliability function and Polarity comparision reliability function
Reliability function F is defined as follows：
F=FA·down+FP (9)
In formula, FA.dowmFor the polarity reliability function of detected downstream point, for phase current FA=FAp, for zero-sequence current
FA=FA0；FpFor the Polarity comparision reliability function of this test point；
When reliability function value is more than 0.5, then confidence level is higher, using determined by fault current Polarity comparision method
Fault section is very reliable, it is not necessary to other householder methods.
Embodiment 1：
A kind of active distribution network Fault Locating Method compared based on current polarity,
It is illustrated in figure 1 the program flow diagram of the Fault Locating Method compared based on current polarity of the present invention.Failure is determined
Position specific algorithm is as follows：
(1) first determine whether that system is small current neutral grounding system or heavy current grounding system,
If small current neutral grounding system, then following operation is performed：
A each phase current of () real-time detection simultaneously calculates zero-sequence current；
B () judges whether to there occurs phase fault according to formula (1), if it is, order performs following operation；It is no
Then, step (d) is gone to；
C () determines whether really to there occurs phase fault according to formula (3), if it is, going to step (f)；It is no
Then, following operation is performed；
D () judges whether to there occurs low current grounding according to formula (2), if it is, order performs following operation；It is no
Then, return to step (a)；
E () determines whether really to there occurs low current grounding according to formula (4), if it is, order performs following behaviour
Make；Otherwise, return to step (a)；
F () gathers the fault-current signal of half cycle and calculates its polarity number；
G () obtains the fault-current signal polarity number of detected downstream point, if test point is not detected by fault current, its
Polarity number is 0；
H () judges whether to meet fault location condition according to formula (7), while receiving the fault location knot of upstream detection point
Really, if this test point meets fault location condition and upstream detection point is unsatisfactory for fault location condition, trouble point is located at this
Between test point and detected downstream point；If this test point meets fault location condition and upstream detection point also meets fault location
Condition, then trouble point is not or not the downstream of this test point；
I () calculates this test point fault location confidence level, if confidence level is larger, order performs next step operation；If can
Reliability is less or detected downstream point is not detected by fault current, then using the detected downstream point of test point downstream as this test point
Detected downstream point, return to step (g)；
(j) by this test point fault location result report control centre and under reach detected downstream point.
(2) if system is heavy current grounding system, following operation is performed：
The each phase current of (a) real-time detection；
B () judges whether to there occurs short trouble according to formula (1), if it is, order performs following operation；Otherwise, return
Return step (a)；
C () determines whether really to there occurs short trouble according to formula (3), if it is, order performs following operation；It is no
Then, return to step (a)；
D () gathers the fault-current signal of half cycle and calculates its polarity number；
E () obtains the fault-current signal polarity number of detected downstream point, if test point is not detected by fault current, its
Polarity number is 0；
F () judges whether to meet fault location condition according to formula (7), while receiving the fault location knot of upstream detection point
Really, if this test point meets fault location condition and upstream detection point is unsatisfactory for fault location condition, trouble point is located at this
Between test point and detected downstream point；If this test point meets fault location condition and upstream detection point also meets fault location
Condition, then trouble point is not or not the downstream of this test point；
G () calculates this test point fault location confidence level, if confidence level is larger, order performs next step operation；If can
Reliability is less or detected downstream point is not detected by fault current, then using the detected downstream point of test point downstream as this test point
Detected downstream point, return to step (e)；
(h) by this test point fault location result report control centre and under reach detected downstream point.
Fig. 2 is the feeder line figure containing distributed power source of the present invention.The fault-tolerant processing algorithm of the present invention is entered with reference to Fig. 2
Row explanation.When reliability function value is less, following fault location fault-tolerant processing is carried out：When reliability function value is less by under
Trip FTU ignores, and re-starts fault location.Below tolerant fail algorithm is illustrated by taking Fig. 2 as an example.In figure, FTU1、FTU2、FTU3
It is respectively FTU2、FTU3、FTU4Upstream, FTU2、FTU3、FTU4It is respectively then FTU1、FTU2、FTU3Downstream.Assume fault bit
Put in FTU2And FTU3Between, upstream FTU2The fault location reliability function value of calculating less (being less than 0.5), then FTU2Ignore
FTU3, to FTU4Calling order is sent, FTU is received4The polarity number of transmission, and perform the calculation of fault current Polarity comparision fault location
Method, if the condition and reliability function value that meet fault location larger (being more than 0.5), judge abort situation in FTU2With
FTU4Between；If being unsatisfactory for the condition of fault location or meeting fault location condition but reliability function value is less (is less than
Or FTU 0.5)4Fault current is not detected by, then judges that failure is located at FTU2And FTU3 between.
Fig. 3 is originally the active distribution network simulation model of the present invention.The model is one typically with distributed power source and 6
The emanant 10kV power distribution networks of bar feeder line.The positive sequence impedance of feeder line is Z1=(0.17+j0.38) Ω/km, positive sequence is led over the ground
Receive as b1=j3.045 μ s/km, zero sequence impedance is Z0=(0.23+j1.72) Ω/km, over the ground admittance is b to zero sequence0=j1.884 μ
S/km, line length is L1=3km, L2=6km, L3=9km, L4=12km, L5=15km, L6=20km.Load is triangle
The load of shape connection, is Z per phase load impedanceL=(67+j50) Ω.
Simulation analysis are carried out to above-mentioned Fault Locating Method below with the model.For k1The 4 class failures that point occurs are tested
Above Fault Locating Method is demonstrate,proved, four class failures are respectively：Three phase short circuit fault, two-phase short-circuit fault (AB), small current neutral grounding event
Barrier (A phases) and high current earth fault (A phases).The fault current polarity number difference that each test point is calculated is not as shown in table 1, in table
Symbol "-" represents that the test point is not detected by fault current and is not involved in Polarity comparision.
The fault current polarity value difference of table 1
For k1The three-phase fault that point occurs, as shown in Table 1, FTU61With FTU downstream62A phases and B phase fault electric currents pole
Property value difference is 0, takes Th=N=64, krel=0.7, formula (7) is unsatisfactory for, so A phases and B phases are in FTU61With FTU62Between not
It is fault section；FTU61With FTU downstream62C phase fault current polarities value difference be 5, take Th=M=37, krel=0.7, it is discontented with
Sufficient formula (7), so C phases are in FTU61With FTU62Between also without failure, i.e., in FTU61With FTU62Between without short trouble.
FTU62With FTU downstream63A phases and B phase fault current polarities value difference be respectively -128 and 128, take Th=N=64, krel=
0.7, formula (7) is met, so A phases and B phases are in FTU62With FTU63Between be fault section；FTU62With FTU downstream63C phases
Fault current polarity difference is -71, takes Th=M=42, krel=0.7, formula (7) is met, so C phases are in FTU62With FTU63Between
It is also fault section, i.e., in FTU62With FTU63Between there is three phase short circuit fault.Due to FTU64It is not detected by fault current,
So its fault current polarity number is 0.Although FTU63The fault current of A, B, C three-phase also meet formula (7) respectively, but,
Due to its upstream FTU62Have determined that FTU63There is failure in upstream, so FTU63There is no downstream failure in judgement, failure is fixed
Position result is correct.
For k1The AB two-phase short-circuit faults that point occurs, according to formula (7), using similar above-mentioned fault location judgement side
Method, FTU62Judge in FTU downstream62With FTU63Between there is AB phase to phase fault, FTU62Its fault location result is given
FTU63, by FTU63Fault location result cancel.Final failure judgement section is located at FTU62With FTU63Between, there occurs two-phase
Short trouble, fault location result is correct.
For k1The A phase low current groundings that point occurs, according to formula (7), are judged using similar above-mentioned fault location
Method, FTU62Judge in FTU downstream62With FTU63Between there is low current grounding, FTU62By its fault location result
Occur to FTU63, by FTU63Fault location result cancel.Final failure judgement section is located at FTU62With FTU63Between, occur
Singlephase earth fault, fault location result is correct.
For k1The A phase single-phase grounding faults that point occurs, according to formula (7), are sentenced using similar above-mentioned fault location
Determine method, FTU62Judge in FTU downstream62With FTU63Between there is A phase single-phase grounding faults, FTU62By its failure
Positioning result occurs to FTU63, by FTU63Fault location result cancel.Final failure judgement section is located at FTU62With FTU63It
Between, single-phase grounding fault is there occurs, fault location result is correct.
From above simulation result, the Fault Locating Method compared based on current polarity for three phase short circuit fault, two
Phase short trouble, low current grounding and high current earth fault can realize correct fault location.Due to fault location
Algorithm is realized by ca bin, and only needs to gather the signal of half cycle, and polarity determination methods are again very simple, institute
It is shorter with the fault location used time, it is adaptable to the fast failure positioning of active distribution network.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not to present invention protection model
The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need the various modifications made by paying creative work or deformation still within protection scope of the present invention.
Claims (10)
1. a kind of active distribution network Fault Locating Method compared based on current polarity, is characterized in that：Methods described step includes：
(1) phase current and zero-sequence current of the FTU real-time detection feeder lines of each test point of active distribution network feeder line, each described FTU
Judge whether the test point breaks down according to its continuous phase current values of three samplings and the variable quantity of zero-sequence current successively；
If it is, startup separator positioning, into step (2)；If not, fault location result is nothing, into step (6)；
(2) current signal of half cycle that the FTU records of failure starting point start from failure initial time, other test points
FTU carries out data syn-chronization using the failure initial time of failure starting point FTU as data starting point, records the electricity of half cycle
Stream signal；
(3) FTU of each test point is respectively according to the current signal calculating current polarity number of its half cycle for recording；
(4) light from active distribution network feeder line starting, each test point FTU obtains successively the detected downstream point adjacent with this test point
The current polarity value that FTU is calculated, and the current polarity value of this test point and the difference of detected downstream point current polarity value are calculated,
And this test point is judged according to the absolute value of the difference of the current polarity value and whether it is downstream faulty section between test point
Section；
(5) in the fault section judged in calculation procedure (4) test point confidence level, carry out when confidence level is relatively low failure determine
Position fault-tolerant processing, obtains fault location result；
(6) fault location result is sent to control centre.
2. a kind of active distribution network Fault Locating Method compared based on current polarity as claimed in claim 1, is characterized in that：
Step (1) concretely comprises the following steps：
(1-1)：Judge the system type of active distribution network：If the active distribution network is small current neutral grounding system, into step
(1-2)；If the active distribution network is heavy current grounding system, into step (1-3)；
(1-2)：The phase current and zero-sequence current of the FTU real-time detection feeder lines of each test point；
(1-3)：The FTU of each test point judges whether the failure that is short-circuited according to phase current fault location start-up criterion；Each detection
The FTU of point judges whether low current grounding according to zero-sequence current fault location start-up criterion；Into step (1-6)；
(1-4)：The phase current of the FTU real-time detection feeder lines of each test point；
(1-5)：The FTU of each test point judges whether the failure that is short-circuited according to phase current fault location start-up criterion；
(1-6)：If it is, startup separator positioning, into step (2)；If not, fault location result is nothing, into step
(6)。
3. a kind of active distribution network Fault Locating Method compared based on current polarity as claimed in claim 1, is characterized in that：
The basis for estimation of the small current neutral grounding system is that the active distribution network is system with non effectively earth ed neutral, the high current
It is solidly earthed neutral system that the basis for estimation of earthed system is the active distribution network.
4. a kind of active distribution network Fault Locating Method compared based on current polarity as claimed in claim 1, is characterized in that：
In order to avoid interference signal error starting fault location, in the step (1-6) startup separator positioning before to step (1-3) with
And the result of step (1-5) is verified,
If faulted phase current virtual value IkpMore than or equal to phase current failure safety factor KekpHave with phase current during system failure
Valid value IpProduct, it is determined that there occurs short trouble；
If failure zero-sequence current virtual value Ik0More than or equal to zero-sequence current failure safety factor Kek0With injustice during system failure
Weighing apparatus current effective value IunProduct, it is determined that there occurs low current grounding.
5. a kind of active distribution network Fault Locating Method compared based on current polarity as claimed in claim 1, is characterized in that：
The faulted phase current virtual value IkpComputing formula be：
Wherein, ipK () is the phase current instantaneous value of k-th test point of failure phase；N is adopting for half cycle
Number of samples；
The failure zero-sequence current virtual value Ik0Computing formula be：
Wherein, i0K () is the zero-sequence current instantaneous value of k-th test point of failure zero-sequence current；N is half
The sampling number of cycle.
6. a kind of active distribution network Fault Locating Method compared based on current polarity as claimed in claim 1, is characterized in that：
Current polarity value in the step (3) represents the polarity of each test point electric current, and polarity number is half cycle fault-current signal
In positive sampled value or negative sampled value number.
7. a kind of active distribution network Fault Locating Method compared based on current polarity as claimed in claim 1, is characterized in that：
In the step (4), difference DI of the current polarity value is current polarity value PO of this test pointupSubtract adjacent downstream test point
Current polarity value POdown；
It is described be judged as fault section concrete criterion be：The absolute value of difference DI of the current polarity value is more than or equal to reliable
Coefficient krelWith product T of threshold valueh；
Wherein, when fault current does not pass through zero point in half cycle, Th=N；When fault current passes through zero in half cycle
During point, Th=M；Krel takes 0.5～0.8.
8. a kind of active distribution network Fault Locating Method compared based on current polarity as claimed in claim 1, is characterized in that：
Confidence level F of the test point is current polarity reliability function FAWith Polarity comparision reliability function FPSum；
When confidence level F of the test point is more than or equal to 0.5, then confidence level is higher, i.e., described test point is examined with adjacent downstream
It is defined as fault section between measuring point, while the FTU of the test point sends its fault location result to being adjacent down
Trip test point FTU；
When confidence level F of the test point is less than 0.5, then confidence level is relatively low, and the test point FTU is to adjacent downstream test point
Adjacent downstream test point send calling order, obtain its current polarity value and carry out fault section and judge with fault-tolerant processing until really
Determine fault section.
9. a kind of active distribution network Fault Locating Method compared based on current polarity as described in claim 1-8 is arbitrary, its
It is characterized in that：
A kind of active distribution network fault location system compared based on current polarity, the system is using described a kind of based on electric current
The active distribution network of the active distribution network Fault Locating Method of Polarity comparision, including FTU and control centre, each described FTU it
Between the communication module that can be carried by the FTU carry out data message interaction, the FTU by the communication module that carries with it is described
Control centre communicates.
10. a kind of active distribution network Fault Locating Method compared based on current polarity as described in claim 1-8 is arbitrary, its
It is characterized in that：
A kind of active distribution network fault location system compared based on current polarity, the system is based on current polarity using a kind of
In the power distribution network containing high permeability distributed power source of active distribution network Fault Locating Method relatively, including FTU and control
The heart, the communication module that can be carried by the FTU between each described FTU carries out data message interaction, and the FTU is by carrying
Communication module communicate with the control centre.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107942191A (en) * | 2017-09-22 | 2018-04-20 | 国网上海市电力公司 | Regions and areas's direct current fluctuation sources localization method based on sensitivity analysis |
| CN109061399A (en) * | 2018-10-24 | 2018-12-21 | 河海大学 | One-phase earthing failure in electric distribution network Section Location based on ESMD |
| CN109459663A (en) * | 2018-12-21 | 2019-03-12 | 青岛理工大学 | A kind of intelligent distribution network fault section location method based on Multiple Time Scales |
| CN112505474A (en) * | 2020-10-30 | 2021-03-16 | 国网山东省电力公司聊城供电公司 | Fault positioning method and device based on phase current increment |
| CN112782528A (en) * | 2020-12-31 | 2021-05-11 | 西安理工大学 | Power distribution network fault section positioning method using PMU |
| CN113092937A (en) * | 2021-04-07 | 2021-07-09 | 上海电机学院 | Active power distribution network fault positioning method based on FTU current variation |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1421704A (en) * | 2001-11-28 | 2003-06-04 | 淄博科汇电气有限公司 | Sectional detection method of small current earthing fault of power system |
| US20080211511A1 (en) * | 2007-01-26 | 2008-09-04 | Myongji University Industry And Academia Cooperation Foundation | Method of Generating Fault Indication in Feeder Remote Terminal Unit for Power Distribution Automation System |
| CN103217625A (en) * | 2013-03-20 | 2013-07-24 | 山东理工大学 | Low current earth fault location method based on transient state current waveform comparison |
| CN103245892A (en) * | 2013-05-28 | 2013-08-14 | 合肥新在线科技发展有限公司 | Small-current ground fault line selection device and line selection method thereof |
| CN104950216A (en) * | 2015-06-11 | 2015-09-30 | 广西电网有限责任公司电力科学研究院 | Waveform comparison based power distribution line fault positioning method |
| CN106154116A (en) * | 2016-08-09 | 2016-11-23 | 国电南瑞科技股份有限公司 | A kind of distribution net work earthing fault localization method |
-
2016
- 2016-12-15 CN CN201611162360.7A patent/CN106646130B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1421704A (en) * | 2001-11-28 | 2003-06-04 | 淄博科汇电气有限公司 | Sectional detection method of small current earthing fault of power system |
| US20080211511A1 (en) * | 2007-01-26 | 2008-09-04 | Myongji University Industry And Academia Cooperation Foundation | Method of Generating Fault Indication in Feeder Remote Terminal Unit for Power Distribution Automation System |
| CN103217625A (en) * | 2013-03-20 | 2013-07-24 | 山东理工大学 | Low current earth fault location method based on transient state current waveform comparison |
| CN103245892A (en) * | 2013-05-28 | 2013-08-14 | 合肥新在线科技发展有限公司 | Small-current ground fault line selection device and line selection method thereof |
| CN104950216A (en) * | 2015-06-11 | 2015-09-30 | 广西电网有限责任公司电力科学研究院 | Waveform comparison based power distribution line fault positioning method |
| CN106154116A (en) * | 2016-08-09 | 2016-11-23 | 国电南瑞科技股份有限公司 | A kind of distribution net work earthing fault localization method |
Non-Patent Citations (1)
| Title |
|---|
| 孙桂花等: ""基于分布式智能的小电流接地故障定位技术研究"", 《山东电力技术》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107942191A (en) * | 2017-09-22 | 2018-04-20 | 国网上海市电力公司 | Regions and areas's direct current fluctuation sources localization method based on sensitivity analysis |
| CN107942191B (en) * | 2017-09-22 | 2020-02-07 | 国网上海市电力公司 | Regional area direct current fluctuation source positioning method based on sensitivity analysis |
| CN109061399A (en) * | 2018-10-24 | 2018-12-21 | 河海大学 | One-phase earthing failure in electric distribution network Section Location based on ESMD |
| CN109061399B (en) * | 2018-10-24 | 2021-04-09 | 河海大学 | ESMD-based power distribution network single-phase earth fault section positioning method |
| CN109459663A (en) * | 2018-12-21 | 2019-03-12 | 青岛理工大学 | A kind of intelligent distribution network fault section location method based on Multiple Time Scales |
| CN112505474A (en) * | 2020-10-30 | 2021-03-16 | 国网山东省电力公司聊城供电公司 | Fault positioning method and device based on phase current increment |
| CN112782528A (en) * | 2020-12-31 | 2021-05-11 | 西安理工大学 | Power distribution network fault section positioning method using PMU |
| CN113092937A (en) * | 2021-04-07 | 2021-07-09 | 上海电机学院 | Active power distribution network fault positioning method based on FTU current variation |
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