CN104950216B - A kind of distribution line failure localization method based on waveform comparison - Google Patents
A kind of distribution line failure localization method based on waveform comparison Download PDFInfo
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- CN104950216B CN104950216B CN201510317543.0A CN201510317543A CN104950216B CN 104950216 B CN104950216 B CN 104950216B CN 201510317543 A CN201510317543 A CN 201510317543A CN 104950216 B CN104950216 B CN 104950216B
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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 belongs to system for distribution network of power fault location fields,More particularly to the fault location technology field of closed loop configuration circuit or a large amount of line attachments of distributed generation resource,More particularly to a kind of distribution line failure localization method based on waveform comparison,The present invention is using ca bin (the Feeder Terminal Unit with distributed coordination function,FTU fault current) is detected in real time,During short trouble,By the fault current of this test point compared with the fault current of adjacent test point,Fault section is determined using the polar relationship of waveform,The present invention can be in operation with closed ring circuit or distributed generation resource line attachment,Realize being properly positioned for phase fault,But also fault location can be completed before relay protection acts,Suitable for the rapid cut-off fault location of power distribution network,And without terminal unit collection voltages signal.
Description
Technical field
The invention belongs to system for distribution network of power fault location field more particularly to closed loop configuration circuits or distributed generation resource
A kind of fault location technology field of a large amount of line attachments, and in particular to distribution line failure positioning side based on waveform comparison
Method.
Background technology
As power distribution network is to the iterative method of intelligent distribution network, more and more operation with closed ring circuits, distributed generation resource
(distributed generation, DG) accesses power distribution network, this affects greatly distribution network failure positioning, even results in
Traditional Fault Locating Method failure, intelligent distribution network requires higher to power supply reliability, after breaking down, it is desirable that quick to realize
Fault Isolation and fault recovery with isolated fault region, recover the power supply of non-faulting dead electricity area, and fault location be realize failure every
From the premise and basis with fault recovery.Therefore, the distribution network failure positioning containing operation with closed ring circuit, distributed generation resource becomes
The hot issue of power distribution network research.Traditional Fault Locating Method mainly has：Matrix method, traveling wave method etc..Or these methods are not
It suitable for operation with closed ring circuit, the power distribution network containing distributed generation resource or needs to detect fault current direction, not be suitable for
Intelligent distribution network.Typically no installing voltage transformer on the feeder line of existing power distribution network, so, the current direction of feeder line is difficult to sentence
It is disconnected.As FTU and powerline network gradually become strong, FTU (ca bins：Feeder Terminal Unit, FTU) between
It can carry out substantial amounts of information exchange.Therefore, by the information exchange between FTU, being become by FTU realization distribution network failure positioning can
Can, herein on the basis of with reference to existing electrical power distribution network fault location method, utilize the information exchange of adjacent test point FTU, it is proposed that
Electrical power distribution network fault location method based on waveform comparison.
The content of the invention
The purpose of the present invention provides a kind of distribution line based on waveform comparison to solve the above problem of the prior art
Fault Locating Method, the present invention solves closed circuit, distributed generation resource accesses and can not calculating current side due to not configuring PT
To short trouble orientation problem, with reference on the basis of existing electrical power distribution network fault location method, utilize the letter of adjacent test point FTU
Breath interaction, it is proposed that the electrical power distribution network fault location method based on waveform comparison, since fault location algorithm is by having distribution
The feeder terminal unit of control function is realized, can quickly be calculated, and fault location can be completed before relay protection acts, suitable for matching somebody with somebody
The rapid cut-off fault location of power grid detects each inspection in real time using ca bin (Feeder Terminal Unit, FTU)
The phase current of measuring point during short trouble, according to each test point phase current polarity relativeness, judges fault section, in order to realize
Above-mentioned purpose, the technical solution adopted by the present invention are as follows：
A kind of distribution line failure localization method based on waveform comparison, it is characterised in that：In distribution line normal operation
When, FTU detects the phase current of each test point in real time, when short trouble occurs for distribution line, carries out failure according to the following steps and determines
Position：
Step S1. takes failure half when detecting that phase current is more than preset threshold in faulted phase current sample sequence
The signal of cycle the latter cycle；
Step S2. sets circuit and shares m FTU, i.e., circuit is divided into m section, wherein m >=2；
J-th of FTU is detected the current signal of point failure one cycle of phase and adjacent+1 FTU test point of jth by step S3.
The fault-current signal of same one cycle of failure phase calculates its electric current related coefficient Δ ρj,
In formula, ijp(k) and i(j+1)p(k) it is respectively+1 FTU test point fault current sample sequence of j-th of FTU and jth,
Wherein 0 ＜ j≤m-1；N is the data length of sampling fault-current signal；
Step S4. is by Δ ρjWith setting value ρ0It is compared, judges fault section, and fault location result is uploaded to
Main website is controlled, prompts staff's timely processing failure.
Preferably, according to Δ ρjWith setting value ρ0It is compared, judges fault section, judged as follows：
(1) if+1 test point polarity of wave of j-th of test point and jth is identical, i.e. Δ ρj＞ ρ0, then it is strong to judge section j
Whole district's section；
(2) if j-th of test point and+1 test point polarity of wave of jth are on the contrary, i.e. Δ ρj＜ ρ0, then judge section j for event
Hinder section；
(2) if preceding m-1 section both sides test point current waveform polarity all same, Δ ρj＞ ρ0(0 ＜ j≤m-1), then
The last section is fault section.
Preferably, when short trouble occurring in the circuit, for FTU according to current change quantity signal enabling, FTU records each inspection
The current signal of 2~5 cycles of measuring point.
In conclusion the present invention also has the advantages that：
Utilize the information exchange of adjacent test point FTU, it is proposed that the electrical power distribution network fault location method based on waveform comparison.By
It in fault location algorithm is realized by the feeder terminal unit with distributed coordination function, can quickly calculate, can be protected in relay
Fault location is completed before shield action, suitable for the rapid cut-off fault location of power distribution network.
Description of the drawings
It, below will be to embodiment or existing in order to illustrate more clearly of present example or technical solution of the prior art
There is required attached drawing in technology description to do and simply introduce, it should be apparent that, the accompanying drawings in the following description is only the present invention
Some examples, to those skilled in the art, can also be attached according to these on the premise of creativeness is not paid
Figure obtains other attached drawings.
Fig. 1 is a kind of distribution network automated positioning system of the distribution line failure localization method based on waveform comparison of the present invention
System structure diagram.
Fig. 2 is a kind of positioning flow figure of the distribution line failure localization method based on waveform comparison of the present invention.
Fig. 3 is a kind of distribution line simulation model of the distribution line failure localization method based on waveform comparison of the present invention
Figure.
Fig. 4 is A phase current waveform comparison diagrams in distribution network automated alignment system of the invention.
Fig. 5 is B phase current waveform comparison diagrams in distribution network automated alignment system of the invention.
Specific embodiment
Below in conjunction with the attached drawing in present example, the technical solution in the embodiment of the present invention is carried out clear, complete
Ground describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.Based on hair
Embodiment in bright, the every other implementation that those of ordinary skill in the art are obtained without creative efforts
Example, belongs to the scope of protection of the invention.
As shown in Figure 1, give the Intelligent feeder line automation system (feeder containing distributed generation resource in the present invention
Automation, FA), including control main website, communication network and FTU (including remote terminal unit (remote terminal
Unit, RTU), information exchange can be realized between the control main website and terminal installation and between terminal installation, and also it is each
The executable distributed AC servo system of terminal installation, realizes fault location, Fault Isolation and fault recovery；With reference to Fig. 2, one kind is based on ripple
The distribution line failure localization method that shape compares, carries out fault location according to the following steps：
First, during normal operation, distribution line functions as follows flow progress：Each FTU in circuit detects each phase in real time
Electric current compared with predetermined threshold level, judges whether equality circuit entry condition, and main website can carry out state to FTU during normal work
Inquiry, avoiding device exit working condition.
Secondly, when breaking down, distribution line functions as follows flow progress：When short trouble occurring in circuit, FTU roots
According to current change quantity signal enabling, the current signal of each 2~5 cycles of test point is recorded, each FTU is according to fault data progress event
Hinder section positioning, carry out fault location according to the following steps：
Step S1. is when detecting that phase current is more than jump-value of current preset threshold, in faulted phase current sample sequence
Take the signal of half of cycle the latter cycle of failure；The present invention uses the fault location start-up criterion based on jump-value of current；
Step S2. sets circuit and shares m FTU, i.e., circuit is divided into m section, wherein m >=2；
J-th of FTU is detected the current signal of point failure one cycle of phase and adjacent+1 FTU test point of jth by step S3.
The fault-current signal of same one cycle of failure phase calculates its electric current related coefficient Δ ρj,
In formula, ijp(k) and i(j+1)p(k) it is respectively+1 FTU test point fault current sample sequence of j-th of FTU and jth,
Wherein 0 ＜ j≤m-1；N is the data length of sampling fault-current signal；
Step S4. is by Δ ρjWith setting value ρ0(ρ0For related coefficient threshold value, ρ is generally taken0=0) it is compared, judges
Fault section, and fault location result is uploaded to control main website, staff's timely processing failure is prompted, judges faulty section
Section, is judged as follows：
(1) if+1 test point polarity of wave of j-th of test point and jth is identical, i.e. Δ ρj＞ ρ0, then it is strong to judge section j
Whole district's section；
(2) if j-th of test point and+1 test point polarity of wave of jth are on the contrary, i.e. Δ ρj＜ ρ0, then judge section j for event
Hinder section；
(2) if preceding m-1 section both sides test point current waveform polarity all same, Δ ρj＞ ρ0(0 ＜ j≤m-1), then
The last section is fault section.
Finally, after judging fault section, troubleshooting process is carried out immediately：If judging fault section, by failure
Positioning result is uploaded to control main website, prompts staff's timely processing failure, in the present invention, as shown in figure 3, setting k1 points
Generation short trouble verifies the validity of above-mentioned algorithm, there is six outlets in this model, wherein, using circuit L6 as loop wire, k1 points
For A, B two-phase short-circuit fault in circuit L6, i61aFor A phases FUT1 test point electric currents, i in circuit L661bFor B phases in circuit L6
The electric current of FUT1 test points；i62aFor the electric current of A phases FUT2 test points in circuit L6, i62bFor B phases FUT2 test points in circuit L6
Electric current；i63aFor the electric current of A phases FUT3 test points in circuit L6, i63bFor the electric current of B phases FUT3 test points in circuit L6.
As the electric current i of test point61a、i61b、i62a、i62b、i63a、i63bEntry condition is satisfied by, more than threshold value, that is, is detected
To fault current, fault current is not detected in other test points, therefore, calculates i61aAnd i62a、i61bAnd i62b、i62aAnd i63a、
i62bAnd i63bBetween electric current related coefficient, calculated value is as shown in table 1, as shown in Table 1, i61aAnd i62a、i61bAnd i62bBetween correlation
Coefficient is all higher than 0, does not have failure between test point FTU1 and FTU2；And i62aAnd i63a、i62bAnd i63bBetween related coefficient it is small
In 0, trouble point is located between test point FUT2 and FUT3, and failure is mutually A, B two-phase, and fault location is correct.
Related coefficient between 1 fault current of table
If Fig. 4 and Fig. 5 simulation results represent, i61a、i62aIn the same direction, with i63aReversely, i61b、i62bIn the same direction, with i63bReversely, table
Bright failure is located between test point FUT2 and FUT3, is A, B two-phase short-circuit fault, and fault location is correct.
In conclusion the distribution network failure positioning of the present invention is the basis of Fault Isolation and fault recovery, operation with closed ring line
Road, the access of a large amount of distributed generation resources make fault current more complicated, and voltage transformer are seldom installed on distribution feeder, this causes
Many traditional Fault Locating Method failures, a kind of Fault Locating Method based on waveform comparison proposed by the present invention, by having
The ca bin (Feeder Terminal Unit, FTU) of distributed coordination function detects fault current, short circuit event in real time
It is true using the polar relationship of waveform by the fault current of this test point compared with the fault current of adjacent test point during barrier
Determine fault section, this method can realize phase fault just in operation with closed ring circuit or distributed generation resource line attachment
Determine position, and without terminal unit collection voltages signal.
The foregoing is merely the preferred embodiments of invention, are not intended to limit the invention, all spirit in the present invention
Within principle, any modifications, equivalent replacements and improvements are made should all be included in the protection scope of the present invention.
Claims (2)
1. a kind of distribution line failure localization method based on waveform comparison, it is characterised in that：In distribution line normal operation,
FTU detects the phase current of each test point in real time, when short trouble occurs for distribution line, carries out fault location according to the following steps：
Step S1. takes event when detecting that phase current is more than jump-value of current preset threshold in faulted phase current sample sequence
Hinder the signal of half of cycle the latter cycle；
Step S2. sets circuit and shares m FTU, i.e., circuit is divided into m section, wherein m >=2；
Step S3. by j-th FTU detect point failure one cycle of phase current signal and adjacent+1 FTU test point of jth it is same
The fault-current signal of one cycle of failure phase calculates its electric current related coefficient Δ ρj,
In formula, ijp(k) and i(j+1)p(k) it is respectively+1 FTU test point fault current sample sequence of j-th of FTU and jth, wherein
0 ＜ j≤m-1；N is the data length of sampling fault-current signal；
Step S4. is by Δ ρjWith setting value ρ0It is compared, judges fault section, and fault location result is uploaded to control
Staff's timely processing failure is prompted by main website；According to Δ ρjWith setting value ρ0It is compared, judges fault section, by as follows
Step is judged：
(1) if+1 test point polarity of wave of j-th of test point and jth is identical, i.e. Δ ρj＞ ρ0, then section j is judged to perfect area
Section；
(2) if j-th of test point and+1 test point polarity of wave of jth are on the contrary, i.e. Δ ρj＜ ρ0, then judge section j for faulty section
Section；
(2) if preceding m-1 section both sides test point current waveform polarity all same, i.e. Δ ρj＞ ρ0, wherein 0 ＜ j≤m-1, then
The last section is fault section.
2. a kind of distribution line failure localization method based on waveform comparison according to claim 1, it is characterised in that：Institute
When stating generation short trouble in circuit, for FTU according to current change quantity signal enabling, FTU records each 2~5 cycles of test point
Current signal.
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| WO2017218558A1 (en) * | 2016-06-14 | 2017-12-21 | Schweitzer Engineering Laboratories, Inc. | Phase selection for traveling wave fault detection systems |
| CN106646130B (en) * | 2016-12-15 | 2019-02-19 | 山东工商学院 | A kind of active distribution network Fault Locating Method compared based on current polarity and system |
| CN106526430A (en) * | 2016-12-26 | 2017-03-22 | 北京煜邦电力技术股份有限公司 | Method and device for positioning single-phase grounding fault |
| CN107144762B (en) * | 2017-04-20 | 2023-04-11 | 广西电网有限责任公司电力科学研究院 | Power distribution network ground fault positioning method based on low-current ground line selection device |
| EP3579074B1 (en) * | 2018-06-07 | 2021-01-06 | Siemens Aktiengesellschaft | Computer-implemented method and device for resolving closed loops in automatic fault tree analysis of a multi-component system |
| CN109387744B (en) * | 2018-12-17 | 2021-03-16 | 国网山东省电力公司电力科学研究院 | Distribution network line fault point positioning method and device based on singular value decomposition |
| CN109459663B (en) * | 2018-12-21 | 2021-02-12 | 青岛理工大学 | Intelligent power distribution network fault section positioning method based on multiple time scales |
| CN110873833B (en) * | 2019-12-10 | 2022-04-08 | 国网河南省电力公司洛阳供电公司 | Self-adaptive fault section positioning method for power distribution network containing distributed power supply |
| CN112098773A (en) * | 2020-09-09 | 2020-12-18 | 青岛鼎信通讯股份有限公司 | Interphase short circuit fault positioning method for power distribution network with distributed power supply |
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| CN101201380A (en) * | 2006-12-11 | 2008-06-18 | 淄博科汇电气有限公司 | Method for faulty orientation and subsection of power system low current grounding |
| CN103217625B (en) * | 2013-03-20 | 2015-03-11 | 山东理工大学 | Low current earth fault location method based on transient state current waveform comparison |
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