CN106019007A - DC line lightning stroke flashover property recognition method based on multi-measuring-point electrode current traveling wave - Google Patents
DC line lightning stroke flashover property recognition method based on multi-measuring-point electrode current traveling wave Download PDFInfo
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- CN106019007A CN106019007A CN201610329136.6A CN201610329136A CN106019007A CN 106019007 A CN106019007 A CN 106019007A CN 201610329136 A CN201610329136 A CN 201610329136A CN 106019007 A CN106019007 A CN 106019007A
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- 238000012360 testing method Methods 0.000 claims description 69
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- 238000001514 detection method Methods 0.000 claims description 19
- 230000005611 electricity Effects 0.000 claims description 5
- 230000004888 barrier function Effects 0.000 claims description 4
- 238000012850 discrimination method Methods 0.000 claims description 4
- 230000001052 transient effect Effects 0.000 description 6
- 239000004020 conductor Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention relates to a DC line lightning stroke flashover property recognition method based on a multi-measuring-point electrode current traveling wave, and belongs to the technical field of power system relay protection. The method comprises the steps: setting seven measuring points along the whole DC power transmission line; firstly obtaining current traveling wave data through a plurality of measuring points when the DC power transmission line is stroked by lightning, carrying out the Cubic B-spline wavelet transform of the current traveling wave data, and solving a wavelet transform modulus maximum value, so as to represent the polarity of an initial traveling wave surge; secondly judging a lightning stroke section according to the polarity of the initial traveling wave surge; thirdly judging the property of a lightning stroke flashover according to the polarities of the current initial traveling wave surges obtained at the measuring points at two sides of the lightning stroke section: judging that the lightning stroke flashover is a lightning stroke flashover fault if the polarities of the first wave heads of the positive and negative current traveling wave; or else, judging that the lightning stroke flashover is a lightning shielding failure. The method judges the property of the lightning stroke flashover through employing the difference of the polarities of the first wave heads of the electrode currents of the plurality of measuring points, and can effectively prevent a measuring end fault from causing the impact on the judgment of the property of the lightning stroke flashover. The method is simple in principle, and is reliable and effective.
Description
Technical field
The present invention relates to a kind of DC line lightning stroke flashover character discrimination method based on multi-measuring point electrode current row ripple, belong to power train
System technical field of relay protection.
Background technology
The operating experience of extra-high voltage direct-current transmission shows both at home and abroad, and line fault accounts for the 50% of DC system fault, and thunderbolt is
Cause the main cause of line fault.Landform and weather conditions that extra high voltage direct current transmission line is crossed over are changeable, feelings of being struck by lightning along the line
Condition there are differences, and requires accurate recognition lightning stroke flashover character after DC line generation lightning fault, if can be along the line to DC line
The lightning stroke flashover character occurred effectively differentiates, then can accomplish with a definite target in view in the lightning protection of actual track, according to circuit
Residing landform and environmental condition carry out the lightning Protection Design of segmentation, thus provide basic data support for lightning protection and service work.
At present, the Research on Identification of lightning stroke flashover character is present in circuit design and electromagnetic transient simulation stage, the most more
Detection technique realizes back flashover and thunderbolt fault identification.
Summary of the invention
The technical problem to be solved in the present invention is to propose a kind of DC line lightning stroke flashover character based on multi-measuring point electrode current row ripple to distinguish
Knowledge method, in order to solve the problems referred to above.
The technical scheme is that a kind of DC power transmission line lightning stroke flashover character identification side based on multi-measuring point electrode current row ripple
Method, arranges 7 test points along DC power transmission line total length；When DC line is struck by lightning, first, by multiple test points
Get current traveling wave data, and it is carried out Cubic B-spline Wavelet, ask for wavelet modulus maxima at the beginning of in order to characterize
The polarity that the wave that begins gushes；Secondly, the polarity gushed according to initial row wave, it is judged that thunderbolt section；Again, according to lightning strike area
The polarity discriminating lightning stroke flashover character that the electric current initial row wave that the test point of section both sides gets gushes: if positive and negative electrode current traveling wave
Mintrop wave head polarity is identical, then be judged to back flashover arcing fault, otherwise, then it is judged to thunderbolt.
Concretely comprise the following steps:
The first step, the acquisition of current traveling wave data:
7 test points are set along DC power transmission line total length, when DC line is struck by lightning, obtain event by each test point
Barrier current traveling wave, and window expert's wave datum when intercepting 5ms after lightning fault；
Second step, thunderbolt section differentiate:
The current traveling wave of each test point first step obtained asks for wavelet modulus maxima, takes first wavelet transform modulus maxima
Value in order to characterize the polarity that initial row wave gushes, the polarity gushed according to initial row wave, it is judged that lightning stroke flashover section, it may be assumed that
If sgn is (M1k)×sgn(M2k)=-1, then fault is between test point 1 and detection 2 (1a)
If sgn is (M2k)×sgn(M3k)=-1, then fault is between test point 2 and detection 3 (1b)
If sgn is (M3k)×sgn(M4k)=-1, then fault is between test point 3 and detection 4 (1c)
If sgn is (M4k)×sgn(M5k)=-1, then fault is between test point 4 and detection 5 (1d)
If sgn is (M5k)×sgn(M6k)=-1, then fault is between test point 5 and detection 6 (1e)
If sgn is (M6k)×sgn(M7k)=-1, then fault is between test point 6 and detection 7 (1f)
In formula (1), the value of k is+,-, wherein+for positive pole circuit test point ,-for negative pole circuit test point；M is electricity
The wavelet modulus maxima of popular ripple；Sgn (.) is sign function, if the value of (.) is more than 0, then and sgn (.)=1, if (.)
Value less than 0, then sgn (.)=-1；"×" represents multiplying；
3rd step, the identification of lightning stroke flashover character:
According to electrode current row ripple Mintrop wave head polarity discriminating lightning stroke flashover character, i.e.
If sgn is (Mj+)×sgn(Mj-)=1, then be judged to back flashover flashover (2a)
If sgn is (Mj+)×sgn(Mj-)=-1, then be judged to thunderbolt flashover (2b)
In formula (2), j is the nearest test point from thunderbolt section, and value is 1,2,3 ... 7.
The principle of the present invention is: when DC power transmission line is struck by lightning, the transient state electrode current row ripple Mintrop wave head process of each test point
Change direction directly related with test point position and lightning strike spot position, along with lightning current is propagated to both sides along transmission line of electricity, be positioned at event
The electrode current row ripple Mintrop wave head opposite polarity that the test point of barrier point both sides detects, the electrode current row ripple Mintrop wave of the test point of same side
Head polarity is identical.
During it addition, DC power transmission line suffers counterattack and shielding, the transient current initial wavefront polarity of both positive and negative polarity has substantially
Difference.During thunderbolt shaft tower, positive pole is identical with the transient current Mintrop wave head polarity of negative pole；During thunderbolt transmission line of electricity, positive pole
Transient current Mintrop wave head opposite polarity with negative pole.
The invention has the beneficial effects as follows:
(1) present invention gathers transient state electrode current row ripple by multiple test points along the line, can be according to the pole of any one test point
Current traveling wave Mintrop wave head polar character determines lightning stroke flashover character, it determines result is not affected by lightning strike spot position.
(2) present invention is according to electrode current row ripple Mintrop wave head polarity difference structure criterion in the case of back flashover and thunderbolt, not only
Principle is simple, and differentiates that result accuracy rate is high.
Accompanying drawing explanation
Fig. 1 is bipolar direct current transmission system structural representation of the present invention；
Fig. 2 is that at 550km of the present invention, back flashover fault respectively detects dotted line mould current traveling wave oscillogram；
Fig. 3 is the wavelet transform result of each test point of back flashover at 550km of the present invention；
Fig. 4 is that at 600km of the present invention, thunderbolt fault respectively detects dotted line mould current traveling wave oscillogram；
Fig. 5 is the wavelet transform result of each test point of thunderbolt at 600km of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings and detailed description of the invention, the invention will be further described.
A kind of DC power transmission line lightning stroke flashover character discrimination method based on multi-measuring point electrode current row ripple is complete along DC power transmission line
Length arranges 7 test points；When DC line is struck by lightning, first, current traveling wave data are got by multiple test points,
And it is carried out Cubic B-spline Wavelet, ask for wavelet modulus maxima in order to characterize the polarity that initial row wave gushes；Its
Polarity that is secondary, that gush according to initial row wave, it is judged that thunderbolt section；Again, get according to the test point of thunderbolt section both sides
The polarity discriminating lightning stroke flashover character gushed of electric current initial row wave: if positive and negative electrode current traveling wave Mintrop wave head polarity is identical, then sentence
It is set to back flashover arcing fault, otherwise, then it is judged to thunderbolt.
Concretely comprise the following steps:
The first step, the acquisition of current traveling wave data:
7 test points are set along DC power transmission line total length, when DC line is struck by lightning, obtain event by each test point
Barrier current traveling wave, and window expert's wave datum when intercepting 5ms after lightning fault；
Second step, thunderbolt section differentiate:
The current traveling wave of each test point first step obtained asks for wavelet modulus maxima, takes first wavelet transform modulus maxima
Value in order to characterize the polarity that initial row wave gushes, the polarity gushed according to initial row wave, it is judged that lightning stroke flashover section, it may be assumed that
If sgn is (M1k)×sgn(M2k)=-1, then fault is between test point 1 and detection 2 (1a)
If sgn is (M2k)×sgn(M3k)=-1, then fault is between test point 2 and detection 3 (1b)
If sgn is (M3k)×sgn(M4k)=-1, then fault is between test point 3 and detection 4 (1c)
If sgn is (M4k)×sgn(M5k)=-1, then fault is between test point 4 and detection 5 (1d)
If sgn is (M5k)×sgn(M6k)=-1, then fault is between test point 5 and detection 6 (1e)
If sgn is (M6k)×sgn(M7k)=-1, then fault is between test point 6 and detection 7 (1f)
In formula (1), the value of k is+,-, wherein+for positive pole circuit test point ,-for negative pole circuit test point；M is electricity
The wavelet modulus maxima of popular ripple；Sgn (.) is sign function, if the value of (.) is more than 0, then and sgn (.)=1, if (.)
Value less than 0, then sgn (.)=-1；"×" represents multiplying；
3rd step, the identification of lightning stroke flashover character:
According to electrode current row ripple Mintrop wave head polarity discriminating lightning stroke flashover character, i.e.
If sgn is (Mj+)×sgn(Mj-)=1, then be judged to back flashover flashover (2a)
If sgn is (Mj+)×sgn(Mj-)=-1, then be judged to thunderbolt flashover (2b)
In formula (2), j is the nearest test point from thunderbolt section, and value is 1,2,3 ... 7.
Embodiment 1: ± 800kV DC power transmission line is as shown in Figure 1.The parameter of its circuit is as follows: DC power transmission line total length is
1500km, circuit uses 6 split conductors, and heading spacing is 0.45m.Along circuit 1500km total length from distance M end 300km
Place starts, and arranges a test point every 200km, arranges 7 test points altogether.Fault is arranged: test point 2 and test point 3
Between, there is back flashover fault at distance M end 550km.Fault moment is 0.5s, and transition resistance is set to 0 Ω, sampling
Frequency is 1MHz.
After the first step, fault occur, obtain fault current row ripple, and window when intercepting 5ms after lightning fault according to each test point
Expert's wave datum.
Second step, thunderbolt section differentiate: the current traveling wave of each test point first step obtained asks for wavelet modulus maxima,
Take first wavelet modulus maxima in order to characterize the polarity that initial row wave gushes.From the figure 3, it may be seen that M1+=-0.562, M1-
=-0.561；M2+=-1.451, M2-=-1.454；M3+=-2.979, M3-=-3.222；M4+=2.123, M4-=2.147；M5+=1.037,
M5-=1.037；M6+=0.5603, M6-=0.5604；M7+=0.240, M7-=0.241, sgn (M3+)×sgn(M4+)=-1,
sgn(M3-)×sgn(M4-)=-1, it can be determined that go out lightning strike spot between test point 3 and test point 4.
3rd step, the identification of lightning stroke flashover character: sgn (M3+)×sgn(M3-)=1, it is possible to determine that for back flashover flashover.
Embodiment 2: ± 800kV DC power transmission line is as shown in Figure 1.The parameter of its circuit is as follows: DC power transmission line total length
For 1500km, circuit uses 6 split conductors, and heading spacing is 0.45m.Along circuit 1500km total length from distance M end 300km
Place starts, and arranges a test point every 200km, arranges 7 test points altogether.Fault is arranged: test point 2 and test point 3
Between, there is thunderbolt fault at distance M end 600km.Fault moment is 0.5s, and transition resistance is set to 0 Ω, sampling
Frequency is 1MHz.
After the first step, fault occur, obtain fault current row ripple, and window when intercepting 5ms after lightning fault according to each test point
Expert's wave datum.
Second step, thunderbolt section differentiate: the current traveling wave of each test point first step obtained asks for wavelet modulus maxima,
Take first wavelet modulus maxima in order to characterize the polarity that initial row wave gushes.As shown in Figure 5,
M1+=0.570, M1-=-0.488；M2+=1.07, M2-=-1.288；M3+=2.101, M3-=-2.011；M4+=-2.101, M4-
=2.010；M5+=-1.07, M5-=1.288；M6+=-0.8047, M6-=0.8211；M7+=-0.315, M7-=0.331
, sgn (M3+)×sgn(M4+)=-1, sgn (M3-)×sgn(M4-)=-1, it can be determined that go out lightning strike spot and be positioned at test point 3 and test point 4
Between.
3rd step, the identification of lightning stroke flashover character: sgn (M3+)×sgn(M3-)=-1, it is possible to determine that for back flashover flashover.
Above in association with accompanying drawing, the detailed description of the invention of the present invention is explained in detail, but the present invention is not limited to above-mentioned embodiment party
Formula, in the ken that those of ordinary skill in the art are possessed, it is also possible to make on the premise of without departing from present inventive concept
Various changes.
Claims (2)
1. a DC power transmission line lightning stroke flashover character discrimination method based on multi-measuring point electrode current row ripple, it is characterised in that: edge
DC power transmission line total length arranges 7 test points；When DC line is struck by lightning, first, got by multiple test points
Current traveling wave data, and it is carried out Cubic B-spline Wavelet, ask for wavelet modulus maxima in order to characterize initial row ripple
The polarity of surge；Secondly, the polarity gushed according to initial row wave, it is judged that thunderbolt section；Again, according to thunderbolt section both sides
The polarity discriminating lightning stroke flashover character gushed of the electric current initial row wave that gets of test point: if positive and negative electrode current traveling wave Mintrop wave head
Polarity is identical, then be judged to back flashover arcing fault, otherwise, then it is judged to thunderbolt.
DC power transmission line lightning stroke flashover character identification side based on multi-measuring point electrode current row ripple the most according to claim 1
Method, it is characterised in that concretely comprise the following steps:
The first step, the acquisition of current traveling wave data:
7 test points are set along DC power transmission line total length, when DC line is struck by lightning, obtain event by each test point
Barrier current traveling wave, and window expert's wave datum when intercepting 5ms after lightning fault；
Second step, thunderbolt section differentiate:
The current traveling wave of each test point first step obtained asks for wavelet modulus maxima, takes first wavelet transform modulus maxima
Value in order to characterize the polarity that initial row wave gushes, the polarity gushed according to initial row wave, it is judged that lightning stroke flashover section, it may be assumed that
If sgn is (M1k)×sgn(M2k)=-1, then fault is between test point 1 and detection 2 (1a)
If sgn is (M2k)×sgn(M3k)=-1, then fault is between test point 2 and detection 3 (1b)
If sgn is (M3k)×sgn(M4k)=-1, then fault is between test point 3 and detection 4 (1c)
If sgn is (M4k)×sgn(M5k)=-1, then fault is between test point 4 and detection 5 (1d)
If sgn is (M5k)×sgn(M6k)=-1, then fault is between test point 5 and detection 6 (1e)
If sgn is (M6k)×sgn(M7k)=-1, then fault is between test point 6 and detection 7 (1f)
In formula (1), the value of k is+,-, wherein+for positive pole circuit test point ,-for negative pole circuit test point；M is electricity
The wavelet modulus maxima of popular ripple；Sgn (.) is sign function, if the value of (.) is more than 0, then and sgn (.)=1, if (.)
Value less than 0, then sgn (.)=-1；"×" represents multiplying；
3rd step, the identification of lightning stroke flashover character:
According to electrode current row ripple Mintrop wave head polarity discriminating lightning stroke flashover character, i.e.
If sgn is (Mj+)×sgn(Mj-)=1, then it is judged to back flashover flashover (2a)
If sgn is (Mj+)×sgn(Mj-)=-1, then be judged to thunderbolt flashover (2b)
In formula (2), j is the nearest test point from thunderbolt section, and value is 1,2,3 ... 7.
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Cited By (6)
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| CN108152668A (en) * | 2017-12-04 | 2018-06-12 | 昆明理工大学 | A kind of method for calculating distance between the leakage conductor of conducting and line flashover point |
| CN108896870A (en) * | 2018-06-28 | 2018-11-27 | 四川大学 | Fault recognition method for electric transmission line under power frequency and combined impulse effect |
| CN112578326A (en) * | 2020-11-19 | 2021-03-30 | 国网电力科学研究院武汉南瑞有限责任公司 | Simulation test platform suitable for fault traveling wave positioning |
| CN113131453A (en) * | 2021-05-25 | 2021-07-16 | 华北电力大学 | Single-ended traveling wave protection method for flexible direct current transmission line |
| CN115575783A (en) * | 2022-12-09 | 2023-01-06 | 昆明理工大学 | Multiple Lei Raoji and counterattack recognition method and system for alternating-current power transmission line |
| CN117192292A (en) * | 2023-11-07 | 2023-12-08 | 昆明理工大学 | Lightning grounding electrode line fault distance measurement method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108152668A (en) * | 2017-12-04 | 2018-06-12 | 昆明理工大学 | A kind of method for calculating distance between the leakage conductor of conducting and line flashover point |
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| CN112578326A (en) * | 2020-11-19 | 2021-03-30 | 国网电力科学研究院武汉南瑞有限责任公司 | Simulation test platform suitable for fault traveling wave positioning |
| CN113131453A (en) * | 2021-05-25 | 2021-07-16 | 华北电力大学 | Single-ended traveling wave protection method for flexible direct current transmission line |
| CN113131453B (en) * | 2021-05-25 | 2022-08-09 | 华北电力大学 | Single-ended traveling wave protection method for flexible direct current transmission line |
| CN115575783A (en) * | 2022-12-09 | 2023-01-06 | 昆明理工大学 | Multiple Lei Raoji and counterattack recognition method and system for alternating-current power transmission line |
| CN115575783B (en) * | 2022-12-09 | 2023-03-21 | 昆明理工大学 | Multiple Lei Raoji and counterattack recognition method and system for alternating-current power transmission line |
| CN117192292A (en) * | 2023-11-07 | 2023-12-08 | 昆明理工大学 | Lightning grounding electrode line fault distance measurement method and system |
| CN117192292B (en) * | 2023-11-07 | 2024-02-06 | 昆明理工大学 | Lightning grounding electrode line fault distance measurement method and system |
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