CN104865495B - Feeder line fault travelling wave positioning method and system - Google Patents

Feeder line fault travelling wave positioning method and system Download PDF

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Publication number
CN104865495B
CN104865495B CN201510137616.8A CN201510137616A CN104865495B CN 104865495 B CN104865495 B CN 104865495B CN 201510137616 A CN201510137616 A CN 201510137616A CN 104865495 B CN104865495 B CN 104865495B
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fault
point
power circuit
time difference
traveling wave
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CN104865495A (en
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王清玲
朱子坤
叶睆
曾建鑫
陈宏辉
曹彦朝
曾祥君
杨毅
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Changsha University of Science and Technology
Maoming Power Supply Bureau of Guangdong Power Grid Co Ltd
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Changsha University of Science and Technology
Maoming Power Supply Bureau of Guangdong Power Grid Co Ltd
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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 present invention relates to a kind of feeder line fault travelling wave positioning method and system, the method comprises the steps: when power circuit actually occurs fault, and the fault traveling wave obtaining actual fault point generation arrives the time difference of power circuit head end and line end; The fault traveling wave arrival power circuit head end produced according to actual fault point and time difference and the benchmark traveling wave time difference array of end judge physical fault section; Obtain the distance selected between simulated failure point in actual fault point and physical fault section and account for the ratio of the line length of physical fault section; The accurate location of actual fault point is determined according to the position of each shaft tower or cable connector in described ratio and physical fault section. The principle of the invention is simple, it is not necessary to measure power circuit length and traveling wave speed, and localization of fault result is not by the impact of power circuit sag, it is easy to Project Realization, inventive algorithm is simple, practical, positioning precision is high, has broad application prospects.

Description

Feeder line fault travelling wave positioning method and system
Technical field
The present invention relates to power circuit technical field, particularly relate to a kind of feeder line fault travelling wave positioning method and system.
Background technology
Power circuit includes overhead transmission line and cable run. Overhead transmission line navigates within hill more, and cable run is buried in underground, and trouble point is detected and location difficulty, and the accurately lookup of trouble point, quickly removing and fast recovery of power supply are power system long-standing puzzles. Feeder line fault quick, be accurately positioned, it is possible to be greatly shortened the time of fault restoration, reduce the loss because power failure causes, improve the reliability of operation of power networks, there is great Social and economic benef@.
Current power line fault localization method mainly has traditional impedance type positioning mode and traveling wave positioning mode, and impedance type positioning mode is subject to the impact of the factors such as distribution capacity, supply load, neutral operation method change, and position error is bigger. Traveling wave positioning mode principle is simple, is susceptible to the impact of the factors such as systematic parameter, fault type, transformer mapping fault and transition resistance in theory, and positioning precision is high; But traveling wave positioning mode needs known power circuit length and traveling wave speed. And line length is because being subject to the impact of season, ambient temperature, wind speed, load variations, circuit design length and physical length there is also error, difference due to shaft tower tension force and landform so that sag excursion is relatively big, thus causing that the exact length of circuit exists certain uncertainty. The accurate velocity of wave of circuit traveling wave is subject to the impact of the factors such as line parameter circuit value, frequency change, running status change, it may have certain uncertainty. The accurate defining method of electric network functional failure travelling wave transmission velocity of wave generally has:
(1) utilizing actual measurement route parameter calculation velocity of wave, the method needs other extension set to carry out real-time measurement circuitry parameter, owing to the line parameter circuit value relevant to velocity of wave is more, measures process complicated, causes that the computational accuracy of velocity of wave is low;
(2) actual measurement circuit traveling wave speed, when circuit external area error or circuit close a floodgate, both-end travelling wave positioning system is utilized to measure traveling wave speed in real time, the method needs known line length, and traveling wave has dispersion characteristics in communication process, make traveling wave attenuation distortion in communication process, easily reduce wave speed measurement precision.
Summary of the invention
Based on this, certainty of measurement for solution power circuit length, traveling wave speed affects a difficult problem for electric network functional failure travelling wave positioning precision, the invention provides a kind of feeder line fault travelling wave positioning method, without measuring power circuit length and traveling wave speed, for improving feeder line fault traveling wave positioning precision, there is profound significance.
For achieving the above object, the embodiment of the present invention adopts the following technical scheme that:
A kind of feeder line fault travelling wave positioning method, comprises the steps:
When power circuit actually occurs fault, the fault traveling wave obtaining actual fault point generation arrives the time difference of power circuit head end and line end;
The fault traveling wave arrival power circuit head end produced according to described actual fault point and time difference and the benchmark traveling wave time difference array of end judge physical fault section; Described benchmark traveling wave time difference array includes the fault traveling wave that simulated failure point produces and is transferred to the time difference of power circuit head end and end;
Obtain the distance selected between simulated failure point in described actual fault point and described physical fault section and account for the ratio of the line length of described physical fault section;
The accurate location of actual fault point is determined according to the position of each shaft tower or cable connector in described ratio and described physical fault section.
Accordingly, the embodiment of the present invention also provides for a kind of feeder line fault travelling wave positioning system, including:
Fault traveling wave time difference acquisition module, for when power circuit actually occurs fault, the fault traveling wave obtaining actual fault point generation arrives the time difference of power circuit head end and line end;
Fault section determines module, and the fault traveling wave for producing according to described actual fault point arrives time difference and the benchmark traveling wave time difference array judgement physical fault section of power circuit head end and end; Described benchmark traveling wave time difference array includes the fault traveling wave that simulated failure point produces and is transferred to the time difference of power circuit head end and end;
Length ratio computing module, accounts for the ratio of the line length of described physical fault section for obtaining the distance selected between simulated failure point in described actual fault point and described physical fault section;
Locating module, for determining the accurate location of actual fault point according to the position of each shaft tower or cable connector in described ratio and described physical fault section.
The present invention is based on benchmark traveling wave time difference array, fault traveling wave when only need to compare physical fault arrives the time difference of circuit first and last end and the size of each element in benchmark traveling wave time difference array, then can determine that physical fault section, the ratio of physical fault section total length is accounted for simulated failure point arbitrary in physical fault section, it is determined that the exact position of actual fault point by calculating actual fault point. The principle of the invention is simple, without measuring power circuit length and traveling wave speed, localization of fault result is not by the impact of power circuit sag, it is prone to Project Realization, inventive algorithm is simple, practical, positioning precision is high, can get rid of for feeder line fault and foundation more accurately is provided, have broad application prospects.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of feeder line fault travelling wave positioning method in the embodiment of the present invention;
Fig. 2 is the structural representation of 35kV cable-aerial blended electric power circuit in the embodiment of the present invention;
Fig. 3 is power circuit head end M in the embodiment of the present invention1The voltage traveling wave waveform diagram of place's fault traveling wave harvester record;
Fig. 4 is power circuit terminal M in the embodiment of the present invention6The voltage traveling wave waveform diagram of place's fault traveling wave harvester record;
Fig. 5 is the structural representation of feeder line fault travelling wave positioning system in the embodiment of the present invention;
Fig. 6 is the structural representation of locating module 400 in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, present disclosure is further described.
As it is shown in figure 1, the present embodiment provides a kind of feeder line fault travelling wave positioning method, comprise the steps:
S100 is when power circuit actually occurs fault, and the fault traveling wave obtaining actual fault point generation arrives the time difference of power circuit head end and line end;
S200 arrives time difference and the benchmark traveling wave time difference array judgement physical fault section of power circuit head end and end according to the fault traveling wave that described actual fault point produces; Described benchmark traveling wave time difference array includes the fault traveling wave that simulated failure point produces and is transferred to the time difference of power circuit head end and end;
S300 obtains the distance selected between simulated failure point in described actual fault point and described physical fault section and accounts for the ratio of the line length of described physical fault section;
S400 determines the accurate location of actual fault point according to the position of each shaft tower or cable connector in described ratio and described physical fault section.
Concrete, fault traveling wave harvester is installed at the two ends of power circuit, when power circuit actually occurs fault, the fault traveling wave arrival power circuit head end of actual fault point generation and the time difference of line end is gathered by fault traveling wave harvester, make a look up in benchmark traveling wave time difference array according to this time difference, it is determined that physical fault section; Wherein, benchmark traveling wave time difference array includes the fault traveling wave that each simulated failure point produces and is transferred to the time difference of power circuit means and end. In a kind of detailed description of the invention, benchmark traveling wave time difference array obtains by the following method:
Several diverse locations at power circuit arrange simulated failure point;
The fault traveling wave testing the generation of each simulated failure point successively is transferred to the time difference of power circuit head end and end, builds benchmark traveling wave time difference array.
Wherein, simulated failure point can on-demand be arranged, it is advantageous to, simulated failure point can be respectively provided with at power circuit head end, overhead transmission line and the branch point of cable run junction, overhead transmission line or cable run, power circuit end. And when the fault traveling wave testing the generation of each simulated failure point is transferred to the time difference of power circuit head end and end, testing method or emulation test method can be adopted.
In a kind of detailed description of the invention, if the time difference that the fault traveling wave that actual fault point produces arrives power circuit head end and line end is between certain two time difference in benchmark traveling wave time difference array, namely can determine that the section that this simulated failure point corresponding to two time differences is formed is physical fault section. Such as, the fault traveling wave that actual fault point produces arrives the time difference 29.9 �� s (microsecond) of power circuit head end and line end, and in benchmark traveling wave time difference array, simulated failure point M3It is-29.3 �� s that the fault traveling wave produced arrives the time difference of power circuit head end and line end, simulated failure point M4It is-5.1 �� s that the fault traveling wave produced arrives the time difference of power circuit head end and line end, simulated failure point M5It is 58.9 �� s that the fault traveling wave produced arrives the time difference of power circuit head end and line end, due to-5.1 < 29.9 < 58.9, therefore can determine that the physical fault section residing for actual fault point is simulated failure point M4With simulated failure point M5The section M formed4M5��
After determining physical fault section, the distance selected between simulated failure point in actual fault point and physical fault section can be calculated and account for the ratio of the line length of physical fault section, wherein selected simulated failure point refers to the simulated failure point set in advance of any one in physical fault section, for instance the head end of physical fault section or end.After the distance selected between simulated failure point accounts for the ratio of line length of physical fault section in acquisition actual fault point and physical fault section, the accurate location of actual fault point can be determined according to the position of each shaft tower or cable connector in this ratio and physical fault section.
Illustrate below in conjunction with an instantiation.
Fig. 2 is the structural representation of certain the 35kV cable-aerial blended electric power circuit implementing the present invention. Respectively at power circuit two ends M1��M6Fault traveling wave harvester is installed at place, then arranges 6 simulated failure points at power circuit diverse location, and simulated failure point is respectively set in this example: the head end M of power circuit1, power circuit terminal M6(in actual power line road M1��M6For Bulk Supply Substation), overhead transmission line and cable run junction M2��M3��M4��M5. Pass sequentially through emulation test method and test the time difference of fault traveling wave arrival power circuit head end and end when each simulated failure point breaks down, wherein fault condition to be phase voltage 20207V, earth resistance 200 ��, fault initial phase angle be 90 ��, sample frequency be 10MHz, it is as shown in table 1 that fault traveling wave harvester record trouble traveling wave arrives the power circuit two ends moment.
Table 1
The fault traveling wave harvester that power circuit two ends are installed is measured fault traveling wave signal and is arrived the time of power circuit head end and end, then calculates time difference, it is assumed that simulated failure point MmIt is �� T that the fault traveling wave produced is transferred to the time difference of power circuit first and endm, then the time difference that each simulated failure point produces fault traveling wave is transferred to power circuit head end and end is as shown in table 2.
Table 2
Benchmark traveling wave time difference array is built by the number order of simulated failure point:
H=(�� T1,��T2,��T3,��T4,��T5,��T6)=(-92.9 ,-64.3 ,-29.3 ,-5.1,58.9,92.9)
As in figure 2 it is shown, it is now assumed that M on power circuit4With M5Between f point occur cable local discharge, namely actual fault point is f, power circuit head end M1The voltage traveling wave waveform of place's fault traveling wave harvester record is as it is shown on figure 3, power circuit terminal M6Shown in the voltage traveling wave oscillogram 4 of place's fault traveling wave harvester record, it is determined that initial wavefront arrives power circuit two ends M1��M6Moment respectively 61.4 �� s, the 31.5 �� s at place, then the time difference that can calculate the actual fault point f fault traveling wave produced arrival circuit first and end is �� Tf=29.9 �� s.
Relatively �� TfThe size of each element with array H, as shown in Table 2, �� T4< �� Tf< �� T5, then can determine that physical fault occurs at power circuit simulated failure point M4With M5The line segment being connected, namely judges that physical fault section is as M4With M5The line segment M being connected4M5. Then actual fault point f and physical fault section M is calculated4M5In distance between selected simulated failure point account for the ratio of line length of physical fault section. Assume that in this example, selected simulated failure point is M4, then actual fault point f and simulated failure point M need to only be calculated4Distance account for physical fault section M4M5The ratio Y of total line length.
In Fig. 2, when f point breaks down, according to the fault traveling wave path along power line transmission to power circuit two ends it can be seen that initial wavefront arrives simulated failure point M4Moment T4For:
T 4 = 1 2 ( &Delta; T f - &Delta; T 4 )
Initial wavefront arrives simulated failure point M5Moment T5For:
T 5 = 1 2 ( &Delta; T 5 - &Delta; T f )
Trouble point f to M4The distance l at placef4For:
l f 4 = 1 2 [ l 45 + ( T 4 - T 5 ) v ]
l 45 = 1 2 ( &Delta; T 5 - &Delta; T 4 ) v
Y = l f 4 l 45
In above formula: l45For M4With M5Between distance, v is traveling wave speed.
Comprehensive above various, abbreviation can obtain:
Y = &Delta; T f - &Delta; T 4 &Delta; T 5 - &Delta; T 4
Then actual fault point f and simulated failure point M4Distance account for physical fault section M4M5The ratio Y of total line length is all unrelated with power circuit length and traveling wave speed.����Ӧ���ݴ�����ʽ���ɵõ�ʵ�ʹ��ϵ���ģ����ϵ�M4�ľ���ռʵ�ʹ��������ܳ��ȵı���Y��0.547��
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������ȡģ��300�����ڻ�ȡ����ʵ�ʹ��ϵ�������ʵ�ʹ���������ѡ��ģ����ϵ��ľ���ռ����ʵ�ʹ������ε���·���ȵı�����
��λģ��400�����ڸ������������Լ�����ʵ�ʹ��������и���������½�ͷ��λ��ȷ��ʵ�ʹ��ϵ��׼ȷλ�á�
����ģ���������·ʵ�ʷ�������ʱ�������в�ʱ���ɼ�ģ��100�ɼ�ʵ�ʹ��ϵ�����Ĺ����в����������·�׶�����·ĩ�˵�ʱ��Ȼ���������ȷ��ģ��2 00 makes a look up in benchmark traveling wave time difference array according to this time difference, it is determined that physical fault section; Wherein, benchmark traveling wave time difference array includes the fault traveling wave that each simulated failure point produces and is transferred to the time difference of power circuit means and end. As it is shown in figure 5, for generating this benchmark traveling wave time difference array, in a kind of detailed description of the invention, the feeder line fault travelling wave positioning system of the present invention also includes time difference array acquisition module 500, is used for obtaining described benchmark traveling wave time difference array.
Time difference array acquisition module 500 includes:
Trouble point arranges module 501, arranges simulated failure point for several diverse locations at power circuit;
Building module 502, the fault traveling wave produced for obtaining each simulated failure point is transferred to the time difference of power circuit head end and end, and builds described benchmark traveling wave time difference array.
Wherein, trouble point arranges module 501 and can on-demand arrange when arranging simulated failure point, it is also preferred that the left simulated failure point can be respectively provided with at power circuit head end, overhead transmission line and the branch point of cable run junction, overhead transmission line or cable run, power circuit end. After the fault traveling wave adopting testing method or emulation test method to test out the generation of each simulated failure point is transferred to the power circuit head end time difference with end, builds module 502 and can construct benchmark traveling wave time difference array.
In a kind of detailed description of the invention, if the time difference that the fault traveling wave that actual fault point produces arrives power circuit head end and line end is between certain two time difference in benchmark traveling wave time difference array, fault section determines that the section that namely module 200 can determine that this simulated failure point corresponding to two time differences is formed is physical fault section. Such as, fault traveling wave time difference acquisition module 100 collects the fault traveling wave arrival power circuit head end of actual fault point generation and the time difference 29.9 �� s of line end, and in benchmark traveling wave time difference array, simulated failure point M3It is-29.3 �� s that the fault traveling wave produced arrives the time difference of power circuit head end and line end, simulated failure point M4It is-5.1 �� s that the fault traveling wave produced arrives the time difference of power circuit head end and line end, simulated failure point M5It is 58.9 �� s that the fault traveling wave produced arrives the time difference of power circuit head end and line end, and due to-5.1 < 29.9 < 58.9, therefore fault section determines that module 200 can determine that the physical fault section residing for actual fault point is simulated failure point M4With simulated failure point M5The section M formed4M5��
After determining physical fault section, ratio acquisition module 300 can calculate the distance selected between simulated failure point in actual fault point and physical fault section and account for the ratio of the line length of physical fault section, and wherein selected simulated failure point refers to the simulated failure point set in advance of any one in physical fault section. The ratio that actual fault point accounts for physical fault section total line length with the distance of selected simulated failure point is all unrelated with power circuit length and traveling wave speed. As for how ratio acquisition module 400 calculates described ratio, then it is referred to the computational methods that above-mentioned feeder line fault travelling wave positioning method EXAMPLEPART provides, repeats no more herein.
In actual electric network, power circuit length is the line segment length sum between each shaft tower or cable connector, locating module 400 accounts for the ratio of the line length of physical fault section according to the distance of the particular location of shaft tower each in physical fault section or cable connector and actual fault point to simulated failure point selected in physical fault section, namely can determine that the shaft tower near actual fault point or cable connector, actual fault point can be accurately positioned.
In a kind of detailed description of the invention, as shown in Figure 6, locating module 400 includes:
Length accounting acquisition module 401, for obtaining the length accounting of each shaft tower or cable connector in described physical fault section; Described length accounting is the ratio of the line length that each shaft tower or cable connector account for described physical fault section to the distance of described selected simulated failure point in described physical fault section;
Module 402 is determined in trouble point, for according to described length accounting, and distance between selected simulated failure point accounts for the ratio of the line length of described physical fault section in described actual fault point and described physical fault section, it is determined that the accurate location of described actual fault point.
The realization of above its concrete function of modules, can refer to the method that above-mentioned feeder line fault travelling wave positioning method EXAMPLEPART provides, all no longer repeats one by one herein.
Each technical characteristic of embodiment described above can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics is absent from contradiction, all it is considered to be the scope that this specification is recorded.
Embodiment described above only have expressed the several embodiments of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent. It should be pointed out that, for the person of ordinary skill of the art, without departing from the inventive concept of the premise, it is also possible to making some deformation and improvement, these broadly fall into protection scope of the present invention. Therefore, the protection domain of patent of the present invention should be as the criterion with claims.

Claims (9)

1. a feeder line fault travelling wave positioning method, it is characterised in that comprise the steps:
When power circuit actually occurs fault, the fault traveling wave obtaining actual fault point generation arrives the time difference of power circuit head end and line end;
The fault traveling wave arrival power circuit head end produced according to described actual fault point and time difference and the benchmark traveling wave time difference array of end judge physical fault section; Described benchmark traveling wave time difference array includes the fault traveling wave that simulated failure point produces and is transferred to the time difference of power circuit head end and end;
Obtain the distance selected between simulated failure point in described actual fault point and described physical fault section and account for the ratio of the line length of described physical fault section;
The accurate location of actual fault point is determined according to the position of each shaft tower or cable connector in described ratio and described physical fault section.
2. feeder line fault travelling wave positioning method according to claim 1, it is characterised in that described benchmark traveling wave time difference array obtains as follows:
Several diverse locations at power circuit arrange simulated failure point;
The fault traveling wave obtaining the generation of each simulated failure point is transferred to the time difference of power circuit head end and end, builds described benchmark traveling wave time difference array.
3. feeder line fault travelling wave positioning method according to claim 2, it is characterised in that when the fault traveling wave testing the generation of each simulated failure point is transferred to the time difference of power circuit head end and end, adopt testing method or emulation test method.
4. the feeder line fault travelling wave positioning method according to Claims 2 or 3, it is characterised in that several diverse locations at power circuit arrange the process of simulated failure point and comprise the steps:
It is respectively provided with simulated failure point at power circuit head end, overhead transmission line and the branch point of cable run junction, overhead transmission line or cable run, power circuit end.
5. feeder line fault travelling wave positioning method according to any one of claim 1 to 3, it is characterized in that, determine that the process of the accurate location of actual fault point comprises the steps: according to the position of each shaft tower or cable connector in described ratio and described physical fault section
Obtain the length accounting of each shaft tower or cable connector in described physical fault section; Described length accounting is the ratio of the line length that each shaft tower or cable connector account for described physical fault section to the distance of described selected simulated failure point in described physical fault section;
According to described length accounting, and in described actual fault point and described physical fault section, distance between selected simulated failure point accounts for the ratio of the line length of described physical fault section, it is determined that the accurate location of described actual fault point.
6. a feeder line fault travelling wave positioning system, it is characterised in that including:
Fault traveling wave time difference acquisition module, for when power circuit actually occurs fault, the fault traveling wave obtaining actual fault point generation arrives the time difference of power circuit head end and line end;
Fault section determines module, and the fault traveling wave for producing according to described actual fault point arrives time difference and the benchmark traveling wave time difference array judgement physical fault section of power circuit head end and end; Described benchmark traveling wave time difference array includes the fault traveling wave that simulated failure point produces and is transferred to the time difference of power circuit head end and end;
Ratio acquisition module, accounts for the ratio of the line length of described physical fault section for obtaining the distance selected between simulated failure point in described actual fault point and described physical fault section;
Locating module, for determining the accurate location of actual fault point according to the position of each shaft tower or cable connector in described ratio and described physical fault section.
7. feeder line fault travelling wave positioning system according to claim 6, it is characterised in that also include time difference array acquisition module, is used for obtaining described benchmark traveling wave time difference array; Described time difference array acquisition module includes:
Trouble point arranges module, arranges simulated failure point for several diverse locations at power circuit;
Building module, the fault traveling wave produced for obtaining each simulated failure point is transferred to the time difference of power circuit head end and end, and builds described benchmark traveling wave time difference array.
8. feeder line fault travelling wave positioning system according to claim 7, it is characterized in that, described trouble point arranges module and is respectively provided with simulated failure point at power circuit head end, overhead transmission line and the branch point of cable run junction, overhead transmission line or cable run, power circuit end.
9. the feeder line fault travelling wave positioning system according to any one of claim 6 to 8, it is characterised in that described locating module includes:
Length accounting acquisition module, for obtaining the length accounting of each shaft tower or cable connector in described physical fault section; Described length accounting is the ratio of the line length that each shaft tower or cable connector account for described physical fault section to the distance of described selected simulated failure point in described physical fault section;
Module is determined in trouble point, for according to described length accounting, and distance between selected simulated failure point accounts for the ratio of the line length of described physical fault section in described actual fault point and described physical fault section, it is determined that the accurate location of described actual fault point.
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