CN104155569A - Method for selecting line of double circuit lines on same tower based on current traveling wave short time window wavelet coefficient polarity comparison - Google Patents
Method for selecting line of double circuit lines on same tower based on current traveling wave short time window wavelet coefficient polarity comparison Download PDFInfo
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Abstract
The invention provides a method for selecting a line of double circuit lines on the same tower based on current traveling wave short time window wavelet coefficient polarity comparison, and belongs to the technical field of electric power system relay protection. When some line of the double power transmission circuit lines on the same tower has a fault, current traveling wave data of each line are detected and recorded. A phase-mode transformation matrix is used to calculate an [alpha] mode current traveling wave of each line, then wavelet transformation of the [alpha] mode current traveling wave of each line is carried out, and a high-frequency first scale wavelet coefficient is selected as a research object; and the relative polarity of the first scale wavelet coefficient of each line within a short time window is calculated, a fault line selection and determination matrix R is formed, and then a fault line can be determined according to element in the matrix R. Simulation analysis shows that the method provided by the invention can accurately determine a fault line when a single line of the double circuit lines on the same tower fails.
Description
Technical field
The present invention relates to a kind of common-tower double-return line selection line method based on the comparison of current traveling wave short time-window wavelet coefficient polarity, belong to Relay Protection Technology in Power System field.
Background technology
Same tower double back transmission line, because its construction costs is low, take the advantages such as width of corridor is little, the construction period is short, operation maintenance is simple, remarkable in economical benefits, is therefore widely used.Common-tower double-return line power transmission mode has 120 kinds of fault types, and wherein, cross line fault has 98 kinds, although from kind, cross line fault occupies the majority; But, the probability occurring from fault, the probability that single line down occurs same tower double back transmission line has accounted for 70%-80%.
So, in the process of common-tower double-return line transmission of electricity, if can select fast and accurately faulty line in the situation that of line failure, can not only be by excising fast faulty line, in order to avoid the extension of fault.And can reduce power off time, improve the reliability of system.The present invention utilizes the comparator matrix failure judgement circuit of current traveling wave short time-window wavelet coefficient polarity, and not only principle is simple, and accurately failure judgement is positioned at bus or a certain outlet.
Summary of the invention
The technical problem to be solved in the present invention is the situation of single line down that occurs for common-tower double-return line, proposes a kind of common-tower double-return line selection line method based on the comparison of current traveling wave short time-window wavelet coefficient polarity.
Technical scheme of the present invention is: a kind of common-tower double-return line selection line method based on the comparison of current traveling wave short time-window wavelet coefficient polarity, when same tower double back transmission line returns line failure, detects and records the popular wave datum of each line electricity; Utilize phase-model transformation matrix ask for respectively each circuit α mould current traveling wave and carry out wavelet transformation, choose high frequency the first yardstick wavelet coefficient as research object; Calculate the relative polarity of each circuit the first yardstick wavelet coefficient in short time-window, and form failure line selection discrimination matrix
r, according to
rin element judge faulty line.
Concrete implementation step is:
(1), when same tower double back transmission line breaks down, utilize the reometer of each outgoing line side to record the current traveling wave data of each circuit
,
,
, utilize phase-model transformation matrix Q to ask for respectively each circuit α mould current traveling wave
,
（1）
(2) by each circuit α mould current traveling wave
carry out wavelet decomposition, obtain the first yardstick wavelet coefficient of each outlet
, wherein
n=1,2,3
(3) according to formula (2), calculate the relative polarity between each outlet first yardstick wavelet coefficient;
（2）
In formula,
represent circuit
ihigh frequency the first yardstick wavelet coefficient;
represent circuit
jhigh frequency the first yardstick wavelet coefficient;
represent
with
the result of polarity comparison,
i=1,2,3
j=1,2,3
=-1 represents
with
polarity is contrary,
=1 represents
with
polarity is identical;
(4) according to formula (3), calculate, form same tower double back transmission line fault route selection matrix
r:
（3）
According to every row element, be the number failure judgement circuit of " 1 ":
If elements all in R are all " 1 ", be judged as bus-bar fault;
If the
iin row for the element of " 1 " is n-1, the
ibar circuit is faulty circuit.
Principle of the present invention is:
The invention has the beneficial effects as follows:
1, comparison of the present invention is the relative polarity of wavelet coefficient in short time-window, compares with wavelet modulus maxima, and reliability is high.
2, the present invention only needs to utilize the magnitude of current can realize failure line selection, does not need to introduce voltage.
Accompanying drawing explanation
Fig. 1 is same tower double back transmission line structural representation of the present invention: in figure, and the bus that P, M, N, Q are system,
c efor bus stray capacitance over the ground,
f 1,
f 2,
f 3,
f 4be respectively circuit PM section, double loop MN section I, II is returned and emulation trouble spot, bus M place.PM segment length 200km, MN segment length 140km, NQ segment length 260km.
Fig. 2 is route selection process flow diagram of the present invention;
Fig. 3 is in the embodiment of the present invention 1,
f 1the high frequency first yardstick wavelet coefficient curve map of 1,2 and 3 protection installation place α mould current traveling waves during fault;
Fig. 4 is in the embodiment of the present invention 2,
f 2the high frequency first yardstick wavelet coefficient curve map of 1,2 and 3 protection installation place α mould current traveling waves during fault;
Fig. 5 is in the embodiment of the present invention 3,
f 3the high frequency first yardstick wavelet coefficient curve map of 1,2 and 3 protection installation place α mould current traveling waves during fault;
Fig. 6 is in the embodiment of the present invention 4,
f 4the high frequency first yardstick wavelet coefficient curve map of 1,2 and 3 protection installation place α mould current traveling waves during fault.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
A common-tower double-return line selection line method based on the comparison of current traveling wave short time-window wavelet coefficient polarity, when same tower double back transmission line returns line failure, detects and records the popular wave datum of each line electricity; Utilize phase-model transformation matrix ask for respectively each circuit α mould current traveling wave and carry out wavelet transformation, choose high frequency the first yardstick wavelet coefficient as research object; Calculate the relative polarity of each circuit the first yardstick wavelet coefficient in short time-window, and form failure line selection discrimination matrix
r, according to
rin element judge faulty line.
Concrete implementation step is:
(1), when same tower double back transmission line breaks down, utilize the reometer of each outgoing line side to record the current traveling wave data of each circuit
,
,
, utilize phase-model transformation matrix Q to ask for respectively each circuit α mould current traveling wave
,
（1）
(2) by each circuit α mould current traveling wave
carry out wavelet decomposition, obtain the first yardstick wavelet coefficient of each outlet
, wherein
n=1,2,3
(3) according to formula (2), calculate the relative polarity between each outlet first yardstick wavelet coefficient;
（2）
In formula,
represent circuit
ihigh frequency the first yardstick wavelet coefficient;
represent circuit
jhigh frequency the first yardstick wavelet coefficient;
represent
with
the result of polarity comparison,
i=1,2,3
j=1,2,3
=-1 represents
with
polarity is contrary,
=1 represents
with
polarity is identical;
(4) according to formula (3), calculate, form same tower double back transmission line fault route selection matrix
r:
（3）
According to every row element, be the number failure judgement circuit of " 1 ":
If elements all in R are all " 1 ", be judged as bus-bar fault;
If the
iin row for the element of " 1 " is n-1, the
ibar circuit is faulty circuit.
Embodiment 1:500kV double back transmission line system diagram as shown in Figure 1.Its line parameter circuit value is as follows: total track length PM section 200km, and MN section 140km, NQ holds 260km.Abort situation: PM section, apart from M end 10km place, A phase earth fault occurs.Impedance ground 0 Ω, 90 °, primary fault angle, sampling rate is 1MHz.
(1) according to the step in instructions (1), obtain the current traveling wave data of 3 circuits
,
,
, and utilize phase-model transformation matrix Q to ask for respectively each circuit α mould current traveling wave
.
wherein:
(2) by 3 circuit α mould current traveling waves in (1)
carry out wavelet decomposition, obtain the frequency range of each outlet at the first yardstick wavelet coefficient of 250KHz ~ 500KHz
, its curve map is as shown in 3.
(3) according to the step in instructions (3), calculate the relative polarity between each outlet first yardstick wavelet coefficient;
r 11=
r 22=
r 33=1,
r 12=
r 21=-1,
r 13=
r 31=-1,
r 23=
r 32=1.
(4) according to the step in instructions (4), obtain same tower double back transmission line fault route selection matrix
ras shown in the formula:
Only having as can be seen from the above equation " 1 " number of the 1st row element is 2, according to the process flow diagram shown in Fig. 2, known in conjunction with the position of protective device in Fig. 1, and circuit PM section is faulty line.
Embodiment 2:500kV double back transmission line system diagram as shown in Figure 1.Its line parameter circuit value is as follows: total track length PM section 200km, and MN section 140km, NQ holds 260km.Abort situation: MN section I loop line, apart from M end 60km place, A phase earth fault occurs.Impedance ground 10 Ω, 90 °, primary fault angle, sampling rate is 1MHz.
(1) according to the step in instructions (1), obtain the current traveling wave data of 3 circuits
,
,
, and utilize phase-model transformation matrix Q to ask for respectively each circuit α mould current traveling wave
.
wherein:
(2) by 3 circuit α mould current traveling waves in (1)
carry out wavelet decomposition, obtain the frequency range of each outlet at the first yardstick wavelet coefficient of 250KHz ~ 500KHz
, its curve map is as shown in 3.
(3) according to the step in instructions (3), calculate the relative polarity between each outlet first yardstick wavelet coefficient;
r 11=
r 22=
r 33=1,
r 12=
r 21=-1,
r 13=
r 31=1,
r 23=
r 32=-1.
(4) according to the step in instructions (4), obtain same tower double back transmission line fault route selection matrix
ras shown in the formula:
Only having as can be seen from the above equation " 1 " number of the 2nd row element is 2, according to the process flow diagram shown in Fig. 2, known in conjunction with the position of protective device in Fig. 1, and circuit MN section I loop line is faulty line.
Embodiment 3:500kV double back transmission line system diagram as shown in Figure 1.Its line parameter circuit value is as follows: total track length PM section 200km, and MN section 140km, NQ holds 260km.Abort situation: MN section II loop line, apart from M end 90km place, A phase earth fault occurs.Impedance ground 0 Ω, 90 °, primary fault angle, sampling rate is 1MHz.
(1) according to the step in instructions (1), obtain the current traveling wave data of 3 circuits
,
,
, and utilize phase-model transformation matrix Q to ask for respectively each circuit α mould current traveling wave
.
wherein:
(2) by 3 circuit α mould current traveling waves in (1)
carry out wavelet decomposition, obtain the frequency range of each outlet at the first yardstick wavelet coefficient of 250KHz ~ 500KHz
, its curve map is as shown in 3.
(3) according to the step in instructions (3), calculate the relative polarity between each outlet first yardstick wavelet coefficient;
r 11=
r 22=
r 33=1,
r 12=
r 21=1,
r 13=
r 31=-1,
r 23=
r 32=-1.
(4) according to the step in instructions (4), obtain same tower double back transmission line fault route selection matrix
ras shown in the formula:
Only having as can be seen from the above equation " 1 " number of the 3rd row element is 2, according to the process flow diagram shown in Fig. 2, known in conjunction with the position of protective device in Fig. 1, and circuit MN section II loop line is faulty line.
Embodiment 4:500kV double back transmission line system diagram as shown in Figure 1.Its line parameter circuit value is as follows: total track length PM section 200km, and MN section 140km, NQ holds 260km.Abort situation: bus M breaks down, sampling rate is 1MHz.
(1) according to the step in instructions (1), obtain the current traveling wave data of 3 circuits
,
,
, and utilize phase-model transformation matrix Q to ask for respectively each circuit α mould current traveling wave
.
wherein:
(2) by 3 circuit α mould current traveling waves in (1)
carry out wavelet decomposition, obtain the frequency range of each outlet at the first yardstick wavelet coefficient of 250KHz ~ 500KHz
, its curve map is as shown in 3.
(3) according to the step in instructions (3), calculate the relative polarity between each outlet first yardstick wavelet coefficient;
r 11=
r 12=
r 21=
r 22=
r 13=
r 31=
r 23=
r 32=
r 33=1.
(4) according to the step in instructions (4), obtain same tower double back transmission line fault route selection matrix
ras shown in the formula:
As can be seen from the above equation
rin all elements be all " 1 ", according to the process flow diagram shown in Fig. 2, known in conjunction with the position of protective device in Fig. 1, fault occurs in bus M.
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 possessing those of ordinary skills, can also under the prerequisite that does not depart from aim of the present invention, make various variations.
Claims (2)
1. the common-tower double-return line selection line method based on the comparison of current traveling wave short time-window wavelet coefficient polarity, is characterized in that: when same tower double back transmission line returns line failure, detect and record the popular wave datum of each line electricity; Utilize phase-model transformation matrix ask for respectively each circuit α mould current traveling wave and carry out wavelet transformation, choose high frequency the first yardstick wavelet coefficient as research object; Calculate the relative polarity of each circuit the first yardstick wavelet coefficient in short time-window, and form failure line selection discrimination matrix
r, according to
rin element judge faulty line.
2. the common-tower double-return line selection line method based on the comparison of current traveling wave short time-window wavelet coefficient polarity according to claim 1, is characterized in that concrete implementation step is:
(1), when same tower double back transmission line breaks down, utilize the reometer of each outgoing line side to record the current traveling wave data of each circuit
,
,
, utilize phase-model transformation matrix Q to ask for respectively each circuit α mould current traveling wave
,
（1）
(2) by each circuit α mould current traveling wave
carry out wavelet decomposition, obtain the first yardstick wavelet coefficient of each outlet
, wherein
n=1,2,3
(3) according to formula (2), calculate the relative polarity between each outlet first yardstick wavelet coefficient;
（2）
In formula,
represent circuit
ihigh frequency the first yardstick wavelet coefficient;
represent circuit
jhigh frequency the first yardstick wavelet coefficient;
represent
with
the result of polarity comparison,
i=1,2,3
j=1,2,3
=-1 represents
with
polarity is contrary,
=1 represents
with
polarity is identical;
(4) according to formula (3), calculate, form same tower double back transmission line fault route selection matrix
r:
（3）
According to every row element, be the number failure judgement circuit of " 1 ":
If elements all in R are all " 1 ", be judged as bus-bar fault;
If the
iin row for the element of " 1 " is n-1, the
ibar circuit is faulty circuit.
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|---|---|---|---|
| CN201410253944.XA CN104155569B (en) | 2014-06-10 | 2014-06-10 | Method for selecting line of double circuit lines on same tower based on current traveling wave short time window wavelet coefficient polarity comparison |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116294A (en) * | 2015-09-18 | 2015-12-02 | 国家电网公司 | Traveling wave polarity measure based power distribution network cable fault monitoring method |
| CN113378111A (en) * | 2021-06-22 | 2021-09-10 | 四川汇源光通信有限公司 | Method for judging effectiveness of traveling wave current of power transmission line |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101252274B (en) * | 2008-04-03 | 2011-04-13 | 昆明理工大学 | Same tower double back transmission line fault distance measuring time domain method using single end current flow |
| CN101252275B (en) * | 2008-04-08 | 2015-07-22 | 昆明理工大学 | Coupling double line down distance measuring method using six-phase system new phase mode transformation |
| CN103293447B (en) * | 2013-05-30 | 2015-09-16 | 昆明理工大学 | A kind of distance-finding method only utilizing the non-cross line fault of the same tower double back transmission line of single-end information |
| 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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116294A (en) * | 2015-09-18 | 2015-12-02 | 国家电网公司 | Traveling wave polarity measure based power distribution network cable fault monitoring method |
| CN113378111A (en) * | 2021-06-22 | 2021-09-10 | 四川汇源光通信有限公司 | Method for judging effectiveness of traveling wave current of power transmission line |
| CN113378111B (en) * | 2021-06-22 | 2022-09-20 | 四川汇源光通信有限公司 | Method for judging effectiveness of traveling wave current of power transmission line |
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