CN104914352B - A kind of NUGS method for locating single-phase ground fault differentiated based on harmonic wave difference - Google Patents
A kind of NUGS method for locating single-phase ground fault differentiated based on harmonic wave difference Download PDFInfo
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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
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- 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
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- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
A kind of NUGS method for locating single-phase ground fault differentiated based on harmonic wave difference, in failure occurs for this method the moment, sample request is sent to all fault detectors, the current signal that a period of time before and after the moment occurs for failure is recorded, the current signal of record is decomposed into DC component, fundamental wave and higher hamonic wave using FFT.Retain higher hamonic wave, the harmonic content value obtained on every fault detector is subtracted each other with fault detector homogeneous harmonic content value immediately after, form the matrix of the operation result corresponding to each harmonic.Matrix is chosen line by lineRow maximum, and form matrix of differences.WillThe most part of path of middle outlet number of times is determined as faulty section.The present invention proposes that Fault Locating Method is simple in construction, is easily achieved, and the lower deployment cost of its complete set of equipments can be greatly reduced；Do not change the original ground property of power distribution network, the advantage of low current grounding system power distribution network reliability is not reduced；Simultaneously without non-stationary signal is separately injected, the stable operation risk of power distribution network is not increased.
Description
Technical field
The invention belongs to distribution network failure field of locating technology, a kind of small current neutral grounding based on harmonic wave diagnostic method is especially designed
System (NUGS) method for locating single-phase ground fault.
Background technology
Solidly grounded system is not widely used in below 66kV power distribution network neutral point, the distribution network optimization of this form
Gesture is the high reliability of its power supply, enables in particular to operate with failure in short-term under singlephase earth fault situation.However, single
The current characteristic of phase fault is not very obvious in such power distribution network, it is impossible to fixed a breakdown by the means of trip protection, can only
It is enough that tour investigation trouble point along fault detector is utilized on the premise of fault wire is selected.
At present, the fault detector implementation method of technology more maturation includes " S injection methods " and " middle electric-resistivity method ", Liang Zhe
The problem of fault location is difficult is solved to a certain extent.But, the former realization needs additional high-pressure Coupling device, hardware investment compared with
It is high and insensitive to high resistant and electric arc jitterbug；Requirement of the latter to auxiliary hardware devices is also higher, while it implements broken
It is broken the original neutral ground property of power distribution network.Both belong to active location method, it is necessary to actively inject non-stationary into power network
Signal, safe and stable operation to power distribution network and its unfavorable.
The content of the invention
The purpose of the present invention is that, to overcome existing fault detector to realize the defect of algorithm, the present invention is using a kind of passive
Algorithm, i.e., occur the moment using single-phase fault, the power distribution network produced high-frequency harmonic feature content before and after trouble point in itself
Otherness feature, targetedly proposes a kind of NUGS method for locating single-phase ground fault differentiated based on harmonic wave difference.
To solve above-mentioned technical problem, the present invention uses following technical scheme：
A kind of single-phase grounded malfunction in grounded system of low current localization method based on harmonic wave difference diagnostic method, including following step
Suddenly：
1st, several fault detectors are distributed on faulty line at a certain distance, indicator should be able to measure three-phase electricity
Stream；Comprehensive distinguishing unit is deployed on bus, the comprehensive distinguishing unit should be able to measure three-phase voltage, and can be with every event
Hinder indicator and carry out simple information exchange.
2nd, comprehensive distinguishing unit measures bus three-phase voltage in real time, and below 0.8pu, other two-phases are dropped to single-phase voltage
It is that foundation determines failure initial time and failure phase to be raised to more than 1.2pu, and sends sample request to all fault detectors.
3rd, each fault detector measures phase current in real time, and when recording failure generation after receiving comprehensive distinguishing unit requests
The current signal of a period of time before and after carving, length is that each two cycles before and after the moment occur for failure.
4th, each fault detector using FFT by the current signal recorded in step 3 be decomposed into DC component, fundamental wave and
Higher hamonic wave, wherein higher hamonic wave include the harmonic wave of secondary to seven times.
5th, the DC component and fundamental wave in step 4 are given up；Since the fault detector near bus, by this TV station failure
The frequency-domain transform result of the time-domain signal obtained on indicator and fault detector homogeneous harmonic conversion result phase immediately after
Subtract, form the matrix Δ U of the operation result corresponding to each harmonic.I.e.
Operator "-" represents the difference of the harmonic content value of two adjacent fault detectors in subscript；K is represented in target line
The total number of units for the fault detector disposed, MjFor the fault detector of distribution on the line.M(j-1)-jRefer to for two neighboring failure
Show the part of path between device.If singlephase earth fault F occurs in M2And M3Between, now corresponding fault wire section is M2-3。
6th, matrix Δ U row maximum is chosen line by line, and forms matrix of differences
Each element represents second harmonic to the differentiation result of the seventh harmonic difference respectively.It differentiates that the corresponding part of path of result is this time
The faulty section that harmonic wave judges.
7th, in step 6 matrix of differences, the most part of paths of occurrence number, as fault wire section.
The beneficial effects of the invention are as follows：Proposed by the invention is simply easy to real based on harmonic component Fault Locating Method
It is existing, the lower deployment cost of its complete set of equipments can be greatly reduced；Do not change the original ground property of power distribution network, do not reduce small current neutral grounding
The advantage of system power net reliability；Simultaneously without non-stationary signal is separately injected, the stable operation risk of power distribution network is not increased.
Brief description of the drawings
Fig. 1 is present invention examination example line assumption diagram；
Fig. 2 is implementing procedure figure of the present invention；
Fig. 3 is that failure mutually differentiates logic chart.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.
Fig. 1 is that after small current neutral grounding system breaks down, certain faulty line chosen in advance by failure line selection technology is intended to
The specific position of fault is determined using fault detector.MjFor the fault detector of distribution on the line.M(j-1)-1Surveyed to be two neighboring
Part of path between amount point.If singlephase earth fault F occurs in M2And M3Between, now corresponding fault wire section is M2-3。
Fig. 2 carries out the implementing procedure of fault location for the present invention under the conditions of the power network wiring shown in Fig. 1：It is poor based on harmonic wave
It is worth the small current neutral grounding system single-phase fault localization method differentiated, comprises the following steps：
1st, comprehensive distinguishing unit gathers bus three-phase phase voltage signal in real time, is designated as Ua,UbAnd Uc.If certain phase phase voltage is fallen
Drop down onto below 0.8pu, at the same in addition two-phase rise to more than 1.2pu, then by voltage fall it is separate be judged as failure phase,
As shown in Figure 3.Send sample command and the separate information of failure to each fault detector immediately simultaneously.
2nd, each fault detector is received collects each two cycle data before and after faulted phase current immediately after information.
3rd, each fault detector using FFT by the signal decomposition of interception into DC component, fundamental wave and higher hamonic wave.
4th, retain higher hamonic wave, and since second harmonic, untill the seventh harmonic, formed on each fault detector and recorded
Each harmonic content value matrix U, i.e.,
In formulaRepresent the nth harmonic content value recorded on jth platform fault detector.K is distribution failure on the line
The total quantity of indicator
5th, since the fault detector near bus, by the frequency domain of the time-domain signal obtained on this TV station fault detector
Transformation results are subtracted each other with fault detector homogeneous harmonic conversion result immediately after, are obtainedI.e.：
And form each harmonicMatrix Δ U.I.e.
6th, matrix Δ U row maximum is chosen line by line, and forms matrix of differences Δ Umax, i.e.,：
WhereinRepresent the maximum of difference in nth harmonic.The corresponding part of path of the value is to be sentenced by nth harmonic
Disconnected failure segment occurred, regard the faulty section as the differentiation result produced by the subharmonic.
7th, in n-1 differentiation result of generation, using the principle of " the minority is subordinate to the majority ".By the most line of outlet number of times
Section is determined as the section that trouble point occurs.
Described above is presently preferred embodiments of the present invention, but the present invention should not be limited to the example and accompanying drawing institute is public
The content opened.So every do not depart from the lower equivalent or modification completed of spirit disclosed in this invention, protection of the present invention is both fallen within
Scope.
Claims (1)
1. a kind of NUGS method for locating single-phase ground fault differentiated based on harmonic wave difference, it is characterised in that utilize single-phase fault
Generation moment, the otherness feature of power distribution network produced high-frequency harmonic content before and after trouble point in itself is targetedly carried
Go out a kind of localization method of the single-phase grounded malfunction in grounded system of low current differentiated based on harmonic wave difference；
It the described method comprises the following steps：
(1) several fault detectors are distributed on faulty line at a certain distance, indicator should be able to measure three-phase current；
Comprehensive distinguishing unit is deployed on bus, the comprehensive distinguishing unit should be able to measure three-phase voltage, and can be with every event
Hinder indicator and carry out simple information exchange；
(2) comprehensive distinguishing unit measures bus three-phase voltage in real time, and below 0.8pu, other two-phases electricity are dropped to single-phase voltage
Pressure is raised to more than 1.2pu for foundation, determines failure initial time and failure phase, and send sampling to all fault detectors please
Ask；
(3) each fault detector measures phase current in real time, and the moment occurs for record failure after comprehensive distinguishing unit requests are received
The current signal of front and rear a period of time, length is that each two cycles before and after the moment occur for failure；
(4) each fault detector using FFT by the current signal of record in step (3) be decomposed into DC component, fundamental wave and
Higher hamonic wave, wherein higher hamonic wave include the harmonic wave of secondary to seven times；
(5) DC component and fundamental wave in step (4) are given up；Since the fault detector near bus, by this TV station failure
The frequency-domain transform result of the time-domain signal obtained on indicator and fault detector homogeneous harmonic conversion result phase immediately after
Subtract, form the matrix Δ U of the operation result corresponding to each harmonic；I.e.：
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In formula, operator "-" represents the difference of the harmonic content value of two adjacent fault detectors in subscript；K represents target line
On total number of units of fault detector for being disposed, MjFor the fault detector of distribution on the line.M(j-1)-jFor two neighboring failure
Part of path between indicator；If singlephase earth fault F occurs in M2And M3Between, now corresponding fault wire section is M2-3；
(6) matrix Δ U row maximum is chosen line by line, and forms matrix of differences
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Second harmonic is represented respectively to the differentiation result of the seventh harmonic difference per column element；It differentiates that the corresponding part of path of result is
The faulty section that the subharmonic judges；
(7) in step (6) matrix of differences, the most part of paths of occurrence number, as fault wire section.
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| CN106291259B (en) * | 2016-10-31 | 2018-10-23 | 云南电网有限责任公司昆明供电局 | A kind of method of active signal method singlephase earth fault indicator extraction characteristic signal |
| CN106569096B (en) * | 2016-11-09 | 2019-05-10 | 南方电网科学研究院有限责任公司 | A kind of tuning on-line method of power distribution network single-phase fault |
| CN111796165B (en) * | 2020-07-21 | 2021-10-15 | 河海大学 | Power distribution network fault positioning method based on self-adaptive Fourier transform |
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