CN103323741B - A kind of D molded line cable mixed line fault section compared based on false voltage initial row wave amplitude for strong fault sentences method for distinguishing - Google Patents
A kind of D molded line cable mixed line fault section compared based on false voltage initial row wave amplitude for strong fault sentences method for distinguishing Download PDFInfo
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- CN103323741B CN103323741B CN201310206678.0A CN201310206678A CN103323741B CN 103323741 B CN103323741 B CN 103323741B CN 201310206678 A CN201310206678 A CN 201310206678A CN 103323741 B CN103323741 B CN 103323741B
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Abstract
The present invention relates to a kind of D molded line cable mixed line fault section compared based on false voltage initial row wave amplitude for strong fault and sentence method for distinguishing, belong to Fault-Locating Test field, transmission line of alternation current.This method is: when strong fault occurs D molded line cable joint line, extract the false voltage data before and after fault in head and end short time-window and carry out phase-model transformation, obtain
mold component; To both sides
Description
Technical field
A kind of D molded line cable mixed line fault section compared based on false voltage initial row wave amplitude for strong fault of the present invention sentences method for distinguishing, belongs to electric power system fault field of locating technology.
Background technology
Along with pole line-cable-transmission line in electrical network gets more and more, after strong fault occurs joint line, how to determine that fault section becomes a difficult problem of pendulum in face of scholar quickly and accurately.Overhead transmission line fault is generally transient fault, and starting reclosing device has very important effect for the safety and stability of electric system and economical operation; And for cable fault, be generally permanent fault, starting reclosing after fault can produce cable and again damage, and does not need to realize reclosing operation after fault.May there is the situation of overhead transmission line fault by mistake lock-reclosing lock or cable line fault error starting reclosing for joint line, therefore, after strong fault occurs joint line, fault section be distinguished right form wrong and is often necessary.In addition, because overhead transmission line is different with the parameter of cable line, fault traveling wave velocity of propagation is on the line different, and can produce catadioptric at cable tie point, if do not carry out the differentiation of fault section, traditional traveling wave fault positioning method will be no longer applicable in addition.
Summary of the invention
The technical problem to be solved in the present invention is for solving the discrimination of pole line-cable-transmission line fault section, the present invention proposes a kind of D molded line cable mixed line fault section compared based on false voltage initial row wave amplitude for strong fault and sentences method for distinguishing.
Technical scheme of the present invention is: a kind of D molded line cable mixed line fault section compared based on false voltage initial row wave amplitude for strong fault sentences method for distinguishing, when there is strong fault in D molded line cable joint line, extract the false voltage data before and after fault in head and end short time-window and carry out phase-model transformation, obtaining
mold component; To both sides
mold component carries out wavelet transformation, obtains corresponding modulus maximum; The ratio choosing head end and end fault initial row mode maximum value, as criterion characteristic quantity, by comparison criterion characteristic quantity and the size pre-setting threshold values, carries out the differentiation of D molded line cable mixed line fault section.
The method of the invention concrete steps are as follows:
(1), after strong fault occurs D molded line cable joint line, intercept each phase transient voltage waveform before and after circuit head end and end fault in short time-window respectively, and carry out phase-model transformation;
(2) cubic B-Spline interpolation is chosen as wavelet basis function, to both sides
mold component carries out wavelet transformation, obtains corresponding modulus maximum;
(3) utilize the size of respective mode maximum value to characterize the amplitude of false voltage initial row ripple, the modulus maximum being located at false voltage initial row ripple that circuit head end records corresponding is
, the modulus maximum that the false voltage initial row ripple recorded at line end is corresponding is
;
(4) ratio of head end and end fault initial row mode maximum value is chosen
as criterion characteristic quantity, by emulation experiment, threshold values k is set
set1and k
set2, by criterion characteristic quantity k compared with threshold values, carry out D molded line cable mixed line fault section and differentiate:
If k>k
set2, then can be determined as is head end pole line fault;
If k
set1<k< k
set2, then can be determined as is cable fault;
If k<k
set1, then can be determined as is end pole line fault.
When measuring the capable ripple of D molded line cable mixed power transmission line two ends false voltages, data sampling time length is 2ms, and sample frequency is 1MHz.
Principle of the present invention is:
1, the different section of D molded line cable joint line breaks down, the catadioptric situation of the capable ripple of false voltage
As shown in Figure 5, there is strong fault in D molded line cable joint line cut cable F point, if false voltage initial row ripple is
, the refraction coefficient at cable tie point P, Q place is respectively
with
, then the capable ripple of false voltage that M, N measuring end records is respectively
=2
,
=2
.Wherein,
,
,
for overhead transmission line wave impedance,
for cablebreak impedance.Make k=
, above formula is substituted into and can obtain k=1, because the capable ripple of false voltage is uploaded at actual track, decay and distortion can occur sowing time, therefore the value of k can swing near 1 along with the difference of abort situation.
As shown in Figure 6, there is strong fault in D molded line cable joint line head end pole line F point, if false voltage initial row ripple is
, the refraction coefficient at cable tie point P, Q place is respectively
with
, then the capable ripple of false voltage that M, N measuring end records is respectively
=2
,
=2
.Wherein,
,
,
for overhead transmission line wave impedance,
for cablebreak impedance.Make k=
, above formula is substituted into and can obtain k=
>>1, due to the capable ripple of false voltage that N measuring end records
through cable, more serious decay and distortion occur, make its amplitude become less, then k becomes larger.
As shown in Figure 7, there is strong fault in D molded line cable joint line end pole line F point, if false voltage initial row ripple is
, the refraction coefficient at cable tie point P, Q place is respectively
with
, then the capable ripple of false voltage that M, N measuring end records is respectively
=2
,
=2
.Wherein,
,
,
for overhead transmission line wave impedance,
for cablebreak impedance.Make k=
, above formula is substituted into and can obtain k=
<<1, due to the capable ripple of false voltage that M measuring end records
through cable, more serious decay and distortion occur, make its amplitude become less, then k becomes less.
2, the Singularity Detection of wavelet transformation is theoretical
The maximum feature of wavelet transformation is exactly have good Time-Frequency Localization ability, each details of singular signal can be described from time domain and frequency domain simultaneously, the row ripple that fault produces is the high-frequency signal of a kind of non-stationary change, and therefore wavelet transformation becomes the most effective mathematical tool analyzing row ripple.Wavelet modulus maxima point is not only one to one with the catastrophe point of signal, and the size of modulus maximum is directly proportional to the size of sign mutation amount, therefore can characterize the amplitude of wavefront by the size of wavelet modulus maxima.
3, utilize the size of respective mode maximum value to characterize the amplitude of false voltage initial row ripple
The modulus maximum being located at false voltage initial row ripple that circuit head end records corresponding is
, the modulus maximum that the false voltage initial row ripple recorded at line end is corresponding is
, order
, by k and the threshold values k pre-set
set1and k
set2compare, can criterion be formed:
If k>k
set2, then can be determined as is head end pole line fault;
If k
set1<k< k
set2, then can be determined as is cable fault;
If k<k
set1, then can be determined as is end pole line fault.
The invention has the beneficial effects as follows:
1, only need the amplitude information of the capable ripple of head and end fault initial voltage after fault, data communication amount is few;
2, adopt 2ms short time-window to carry out decision analysis, the judgement of fault section can be realized fast;
3, utilize wavelet modulus maxima to characterize the capable wave amplitude of fault initial voltage, criterion characteristic quantity is simple, is beneficial to realization.
Accompanying drawing explanation
Fig. 1 is D type of the present invention (pole line-cable-aerial line) cable joint line structural representation;
Fig. 2 is D molded line cable joint line construction of cable schematic diagram of the present invention;
Fig. 3 is that in embodiment 1, Single Phase Metal earth fault, head end and end occur at D molded line cable joint line cut cable distance head end 90km place
the oscillogram of the capable ripple of mould false voltage;
Fig. 4 is the oscillogram of the wavelet modulus maxima that the capable ripple of false voltage of head end and end measurement in embodiment 1 is corresponding;
Fig. 5 is the schematic diagram that in embodiment 1, the capable wave path of false voltage of strong fault occurs D molded line cable joint line cut cable;
Fig. 6 is the schematic diagram that in embodiment 2, the capable wave path of false voltage of strong fault occurs D molded line cable joint line head end pole line;
Fig. 7 is the schematic diagram that in embodiment 3, the capable wave path of false voltage of strong fault occurs D molded line cable joint line end pole line.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
A kind of D molded line cable mixed line fault section compared based on false voltage initial row wave amplitude for strong fault sentences method for distinguishing, when there is strong fault in D molded line cable joint line, extract the false voltage data before and after fault in head and end short time-window and carry out phase-model transformation, obtaining
mold component; To both sides
mold component carries out wavelet transformation, obtains corresponding modulus maximum; The ratio choosing head end and end fault initial row mode maximum value, as criterion characteristic quantity, by comparison criterion characteristic quantity and the size pre-setting threshold values, carries out the differentiation of D molded line cable mixed line fault section.
The method of the invention concrete steps are as follows:
(1), after strong fault occurs D molded line cable joint line, intercept each phase transient voltage waveform before and after circuit head end and end fault in short time-window respectively, and carry out phase-model transformation;
(2) cubic B-Spline interpolation is chosen as wavelet basis function, to both sides
mold component carries out wavelet transformation, obtains corresponding modulus maximum;
(3) utilize the size of respective mode maximum value to characterize the amplitude of false voltage initial row ripple, the modulus maximum being located at false voltage initial row ripple that circuit head end records corresponding is
, the modulus maximum that the false voltage initial row ripple recorded at line end is corresponding is
;
(4) ratio of head end and end fault initial row mode maximum value is chosen
as criterion characteristic quantity, by emulation experiment, threshold values k is set
set1and k
set2, by criterion characteristic quantity k compared with threshold values, carry out D molded line cable mixed line fault section and differentiate:
If k>k
set2, then can be determined as is head end pole line fault;
If k
set1<k< k
set2, then can be determined as is cable fault;
If k<k
set1, then can be determined as is end pole line fault.
When measuring the capable ripple of D molded line cable mixed power transmission line two ends false voltages, data sampling time length is 2ms, and sample frequency is 1MHz.
Embodiment one: as shown in Figure 1, electric pressure is 220kV to analogue system wiring diagram, and sample frequency is 1MHz.M side system parameter
,
; N side system parameter
,
; Head end pole line
, unit length positive sequence impedance
, unit length zero sequence impedance
, unit length is positive sequence electric capacity over the ground
, unit length is zero sequence electric capacity over the ground
, the construction of cable as shown in Figure 2, end pole line length
, parameter is identical with head end pole line parameter.Suppose that Single Phase Metal earth fault occurs at joint line cut cable distance head end 90km place.
The step that the D molded line cable mixed line fault section that should compare based on false voltage initial row wave amplitude sentences method for distinguishing is:
(1), after strong fault occurs D molded line cable joint line, to intercept before and after circuit head end and end fault 0.2ms, 1.8ms after fault before 2ms(fault respectively) each phase transient voltage waveform, and carry out phase-model transformation.
(2) cubic B-Spline interpolation is chosen as wavelet basis function, to both sides
mold component carries out wavelet transformation, obtains corresponding modulus maximum (as shown in Figure 4).
(3) utilize the size of respective mode maximum value to characterize the amplitude of false voltage initial row ripple, the modulus maximum being located at false voltage initial row ripple that circuit head end records corresponding is
, the modulus maximum that the false voltage initial row ripple recorded at line end is corresponding is
.
(4) for this model, by a large amount of emulation experiment, threshold values is established k
set1be set to 0.3, k
set2request for utilization is met when being set to 3.As seen from Figure 4,
=-1.515,
=-1.548, then
=0.9787, meet criterion k
set1<k< k
set2, therefore can be determined as be cable fault.
Embodiment two: emulate system architecture and parameter, with embodiment one, suppose that Single Phase Metal earth fault occurs at joint line head end overhead transmission line 60km place.
Repeat the step of embodiment 1 Judging fault section, with embodiment one, threshold values is established k
set1be set to 0.3, k
set2be set to 3,
=-10.94,
=-1.411, then
=9.7534, meet criterion k> k
set2, therefore can be determined as be head end overhead transmission line fault.
Embodiment three: emulate system architecture and parameter, with embodiment one, suppose that Single Phase Metal earth fault occurs at joint line head end overhead transmission line 120km place.
Repeat the step of embodiment 1 Judging fault section, with embodiment one, threshold values is established k
set1be set to 0.3, k
set2be set to 3,
=-1.452,
=-12.41, then
=0.1170, meet criterion k< k
set1, therefore can be determined as be end overhead transmission line fault.
Adopt method of the present invention, carried out simulating, verifying to D molded line cable joint line different faults position, result is as shown in the table:
By reference to the accompanying drawings the specific embodiment of the present invention is explained in detail above, but the present invention is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, various change can also be made under the prerequisite not departing from present inventive concept.
Claims (2)
1. sentence method for distinguishing for the D molded line cable mixed line fault section compared based on false voltage initial row wave amplitude of strong fault for one kind, when there is strong fault in D molded line cable joint line, extract the false voltage data before and after fault in D molded line cable joint line head and end short time-window and carry out phase-model transformation, obtaining α mold component; Wavelet transformation is carried out to both sides α mold component, obtains corresponding modulus maximum; The ratio choosing head end and end fault initial row mode maximum value, as criterion characteristic quantity, by comparison criterion characteristic quantity and the size pre-setting threshold values, carries out the differentiation of D molded line cable mixed line fault section;
It is characterized in that: concrete steps are as follows:
(1), after strong fault occurs D molded line cable joint line, intercept each phase transient voltage waveform before and after circuit head end and end fault in short time-window respectively, and carry out phase-model transformation;
(2) choose cubic B-Spline interpolation as wavelet basis function, wavelet transformation is carried out to both sides α mold component, obtain corresponding modulus maximum;
(3) utilize the size of respective mode maximum value to characterize the amplitude of false voltage initial row ripple, the modulus maximum being located at false voltage initial row ripple that circuit head end records corresponding is M
m, the modulus maximum that the false voltage initial row ripple recorded at line end is corresponding is M
n;
(4) ratio of head end and end fault initial row mode maximum value is chosen
as criterion characteristic quantity, by emulation experiment, threshold values k is set
set1and k
set2, by criterion characteristic quantity k compared with threshold values, carry out D molded line cable mixed line fault section and differentiate:
If k>k
set2, then can be determined as is head end pole line fault;
If k
set1<k<k
set2, then can be determined as is cable fault;
If k<k
set1, then can be determined as is end pole line fault.
2. the D molded line cable mixed line fault section compared based on false voltage initial row wave amplitude according to claim 1 sentences method for distinguishing, it is characterized in that: when measuring the capable ripple of D molded line cable mixed power transmission line two ends false voltages, data sampling time length is 2ms, and sample frequency is 1MHz.
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| CN103513160B (en) * | 2013-09-26 | 2016-08-17 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of same-tower double-circuit direct-current transmission line fault line selection |
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| CN108107319A (en) * | 2017-11-27 | 2018-06-01 | 山东大学 | A kind of multiterminal flexible direct current electric network fault localization method and system |
| CN109870628B (en) * | 2018-08-31 | 2020-12-04 | 国网江苏省电力有限公司苏州供电分公司 | Fault line identification method for multi-terminal flexible direct current transmission system |
| CN109387728B (en) * | 2018-12-21 | 2021-02-02 | 云南电网有限责任公司电力科学研究院 | Single-phase earth fault line selection method and system |
| CN110412427A (en) * | 2019-08-21 | 2019-11-05 | 成都信息工程大学 | A kind of low-voltage power fault detection positioning system and fault detection method |
| CN111224386B (en) * | 2020-01-13 | 2022-05-17 | 国网河北省电力有限公司经济技术研究院 | Pilot protection method, pilot protection system and terminal equipment |
| CN111812456B (en) * | 2020-07-02 | 2022-10-21 | 国网江苏省电力有限公司检修分公司 | Power transmission line fault positioning method, device and system |
| CN112731060A (en) * | 2020-12-24 | 2021-04-30 | 西安理工大学 | Self-adaptive reclosing method for high-voltage overhead-cable hybrid line |
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