CN104793104A - Low-current single-phase grounding fault line selection method based on multi-criterion integration - Google Patents
Low-current single-phase grounding fault line selection method based on multi-criterion integration Download PDFInfo
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Abstract
The invention discloses a low-current single-phase grounding fault line selection method based on multi-criterion integration. The method includes that a symbol t is used for indicating transient-state component strength, and a symbol r is used for indicating reliability; the higher the reliability r is, the higher the line selection accuracy is when a wavelet and energy method is adopted, and the line selection accuracy descends as the r is reduced and descends in an accelerated manner; when r is larger than or equal to 0.8 and smaller than or equal to 1, line selection accuracy is up to 99% when a line selection method based on transient-state component is adopted; when r is larger than or equal to 0 and smaller than or equal to 0.4, line selection accuracy of a line selection method based on transient-state component descends obviously, so that the line selection method based on steady-state component is unsuitable for adoption; when r is larger than or equal to 0.4 and smaller than or equal to 0.8, an integration method is started for line selection. The method utilizes both transient-state information of fault and steady-state information, so that the defect of single criterion is overcome to certain extent, and complementing of advantages of a transient-state algorithm and a steady-state algorithm is realized.
Description
Technical field
The present invention relates to small area analysis singlephase earth fault field, particularly relate to the low-current single-phase earth fault line selection method merged based on many criterions.
Background technology
China 6kV ~ 66kV power distribution network majority takes small current neutral grounding system.The fault great majority of small current neutral grounding system are singlephase earth faults.When there is singlephase earth fault, healthy phases voltage raises as line voltage, if there is intermittent arc grounding also can cause arcing ground over-voltage, and increasing along with feeder line, capacitance current also increases thereupon.Long-play can be expanded into or multipoint earthing short circuit at 2 by causing trouble, and even phase fault occurs, security of system is subject to serious threat.Therefore, failure line selection is accurately located and gets rid of the important prerequisite of one-phase earthing failure in electric distribution network.
At present; the fault line selection method for single-phase-to-ground fault of domestic and international employing is summed up following several: Insulation monitoring method, active current ground protection method, power direction ground protection method, transient current ground protection method, remnant current increment ground protection method, the tradition " zero-sequence current than width method, zero sequence real component than width method, energy method " improved by Fuzzy Neural Network Theory, " Injection Signal track method ", " wavelet analysis route selection method " etc., these methods all exist certain defect.This method analyzes on the basis of current selection method, propose selection method wavelet singular value etection theory, energy method and zero-sequence current colony amplitude comparison phase comparing method merged, the method has that failure message utilization factor is high, calculated amount is moderate and route selection success ratio advantages of higher.
Failure message comprises transient state component and steady-state component two kinds.Transient state component is utilized to have very large relation to the number of carrying out the transient state component comprised in the energy method of route selection and Wavelet Singularity method and failure message, but the transient state component rate of decay is fast, extract difficulty very large, if so only utilize transient state component to carry out failure line selection, when transient state component is little, route selection result is inaccurate.Steady-state component exists in the process of operating with failure always, there is the advantage easily extracted, but route selection result is not as utilizing transient state component route selection accuracy rate high, so Appropriate application transient state component and steady-state component carry out route selection, the deficiency without selection method can be made up, improve the accuracy rate of route selection.During due to small current neutral grounding system generation singlephase earth fault, there is an obvious transient state process, transient zero-sequence capacitance current is often than during its stable state several times to tens times greatly, this process comprises abundant fault signature, it is the basis of the line selection algorithm based on fault transient information, can by judging whether transient information enriches, and decides transient state route selection criterion and whether participates in faulty line selection flow process.
Summary of the invention
The present invention by theoretical for the Singularity Detection of wavelet transformation, zero-sequence current colony amplitude comparison than facies principle and energy method fusion application in single-phase grounded malfunction in grounded system of low current route selection, make full use of payment information, obtain result and there is very high reliability and accuracy, be achieved through the following technical solutions:
Based on the low-current single-phase earth fault line selection method that many criterions merge, comprise transient state component intensity symbol t to represent, confidence level is the degree that transient state component when small current neutral grounding system generation earth fault in failure message exceedes normal component, represent with symbol r, when confidence level r is larger time, adopt small echo and energy method route selection accuracy rate higher, along with the reduction route selection accuracy rate of r also can decline, and in acceleration tendency, adopt based on the selection method route selection accuracy rate of transient state component up to 99% when 0.8<r≤1, when 0<r≤0.4, selection method accuracy rate based on transient state component declines obvious, should not adopt, adopt the selection method based on steady-state component, and fusion method route selection is enabled when 0.4<r≤0.8, fusion method is, first wavelet singular value is detected route selection method, energy method, the Output rusults of colony amplitude comparison phase comparing method, carry out fusion method through fusion method again and carry out Algorithm Analysis, thus obtain judging the most accurately,
The overall principle that many criterions merge route selection is: utilize the single criterion of selection method optimum selecting to participate in faulty line selection flow process, to reach optimum route selection result, concrete steps are as follows:
1) calculate transient state component intensity t, if 0.5<t≤1, then can think that transient information is obvious, transient arithmetic confidence level is 80%≤r≤1, and transient arithmetic is as faulty line selection result;
2) if 0.2≤t≤0.5, confidence level 40%≤r≤80%, more believe and judge blending algorithm more, start faulty line selection method, its concrete steps are: the wavelet singular value of first carrying out transient state detects selection method, is carrying out energy method, is finally carrying out the colony amplitude comparison phase comparing method of stable state, the route selection result obtained is put by strengthening coefficient information fusion side, obtains best route selection conclusion;
3) if t<0.2, transient state confidence level is r<40%, now believes stable state line selection algorithm, and namely the route selection of colony amplitude comparison phase comparing method obtains conclusion.
The method of information fusion has weighting factor method, clustering methodology, D-S method, voting is sent out, artificial neural network, expert system, and adopt weighting factor method to carry out convergence analysis, failure message comprises transient state component and steady-state component two kinds.
The good effect that the present invention has is:
The low-current single-phase earth fault line selection method merged based on many criterions of the present invention, this method has following features: the algorithm that the multiple criterion of proposition merges not only make use of the transient information of fault but also make use of steady state information, overcome the deficiency of single criterion to a certain extent herein, accomplish the mutual supplement with each other's advantages of transient arithmetic and steady-state algorithm.
Accompanying drawing explanation
Below in conjunction with the embodiment in accompanying drawing, the present invention is described in further detail, but do not form any limitation of the invention.
Fig. 1 is the low-current single-phase earth fault line selection method flow merged based on many criterions of the present invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, based on the low-current single-phase earth fault line selection method that many criterions merge, comprise transient state component intensity symbol t to represent, confidence level is the degree that transient state component when small current neutral grounding system generation earth fault in failure message exceedes normal component, represent with symbol r, when confidence level r is larger time, adopt small echo and energy method route selection accuracy rate higher, along with the reduction route selection accuracy rate of r also can decline, and in acceleration tendency, adopt based on the selection method route selection accuracy rate of transient state component up to 99% when 0.8<r≤1, when 0<r≤0.4, selection method accuracy rate based on transient state component declines obvious, should not adopt, adopt the selection method based on steady-state component, and fusion method route selection is enabled when 0.4<r≤0.8, fusion method is, first wavelet singular value is detected route selection method, energy method, the Output rusults of colony amplitude comparison phase comparing method, carry out fusion method through fusion method again and carry out Algorithm Analysis, thus obtain judging the most accurately,
The overall principle that many criterions merge route selection is: utilize the single criterion of selection method optimum selecting to participate in faulty line selection flow process, to reach optimum route selection result, concrete steps are as follows:
1) calculate transient state component intensity t, if 0.5<t≤1, then can think that transient information is obvious, transient arithmetic confidence level is 80%≤r≤1, and transient arithmetic is as faulty line selection result;
2) if 0.2≤t≤0.5, confidence level 40%≤r≤80%, more believe and judge blending algorithm more, start faulty line selection method, its concrete steps are: the wavelet singular value of first carrying out transient state detects selection method, is carrying out energy method, is finally carrying out the colony amplitude comparison phase comparing method of stable state, the route selection result obtained is put by strengthening coefficient information fusion side, obtains best route selection conclusion;
3) if t<0.2, transient state confidence level is r<40%, now believes stable state line selection algorithm, and namely the route selection of colony amplitude comparison phase comparing method obtains conclusion.
The method of information fusion has weighting factor method, clustering methodology, D-S method, voting is sent out, artificial neural network, expert system, and adopt weighting factor method to carry out convergence analysis, failure message comprises transient state component and steady-state component two kinds.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. based on the low-current single-phase earth fault line selection method that many criterions merge, comprise transient state component intensity symbol t to represent, confidence level is the degree that transient state component when small current neutral grounding system generation earth fault in failure message exceedes normal component, represent with symbol r, when confidence level r is larger time, adopt small echo and energy method route selection accuracy rate higher, along with the reduction route selection accuracy rate of r also can decline, and in acceleration tendency, adopt based on the selection method route selection accuracy rate of transient state component up to 99% when 0.8<r≤1, when 0<r≤0.4, selection method accuracy rate based on transient state component declines obvious, should not adopt, adopt the selection method based on steady-state component, and fusion method route selection is enabled when 0.4<r≤0.8, fusion method is, first wavelet singular value is detected route selection method, energy method, the Output rusults of colony amplitude comparison phase comparing method, carry out fusion method through fusion method again and carry out Algorithm Analysis, thus obtain judging the most accurately,
The overall principle that many criterions merge route selection is: utilize the single criterion of selection method optimum selecting to participate in faulty line selection flow process, to reach optimum route selection result, concrete steps are as follows:
Calculate transient state component intensity t, if 0.5<t≤1, then can think that transient information is obvious, transient arithmetic confidence level is 80%≤r≤1, and transient arithmetic is as faulty line selection result;
If 0.2≤t≤0.5, confidence level 40%≤r≤80%, more believe and judge blending algorithm more, start faulty line selection method, its concrete steps are: the wavelet singular value of first carrying out transient state detects selection method, is carrying out energy method, is finally carrying out the colony amplitude comparison phase comparing method of stable state, the route selection result obtained is put by strengthening coefficient information fusion side, obtains best route selection conclusion;
If t<0.2, transient state confidence level is r<40%, now believes stable state line selection algorithm, and namely the route selection of colony amplitude comparison phase comparing method obtains conclusion.
2. the low-current single-phase earth fault line selection method merged based on many criterions according to claim 1, it is characterized in that, the method of information fusion has weighting factor method, clustering methodology, D-S method, voting is sent out, artificial neural network, expert system, adopts weighting factor method to carry out convergence analysis.
3. the low-current single-phase earth fault line selection method merged based on many criterions according to claim 1, is characterized in that, failure message comprises transient state component and steady-state component two kinds.
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| CN104977499A (en) * | 2015-07-23 | 2015-10-14 | 中国电力科学研究院 | Small current grounding system single-phase grounding fault line selection method |
| CN105911414A (en) * | 2016-04-27 | 2016-08-31 | 福州大学 | Fuzzy theory based power distribution network multi-criteria integrated fault line selection method |
| CN105974254A (en) * | 2016-05-16 | 2016-09-28 | 国网江苏省电力公司连云港供电公司 | Transient and steady state line selection method based on voltage calculation comprehensive weight |
| CN106019047A (en) * | 2016-05-18 | 2016-10-12 | 成都理工大学 | Comprehensive line selection fault measurement calculation method for small-current grounding system |
| CN106443350A (en) * | 2016-10-20 | 2017-02-22 | 南方电网科学研究院有限责任公司 | Arc suppression coil grounding system fault line selection method, device and equipment |
| CN107121622A (en) * | 2017-06-16 | 2017-09-01 | 山东电工电气集团新能科技有限公司 | The method that novel fault is indicated system and earth fault is indicated using the system |
| CN108226709A (en) * | 2017-12-20 | 2018-06-29 | 南京威尔泰电气工程有限公司 | A kind of small current neutral grounding faulty line selection method |
| CN109459663A (en) * | 2018-12-21 | 2019-03-12 | 青岛理工大学 | A kind of intelligent distribution network fault section location method based on Multiple Time Scales |
| CN110579684A (en) * | 2019-09-04 | 2019-12-17 | 安徽沃华电力设备有限公司 | low-current grounding system line selection method based on fusion algorithm |
| CN111426982A (en) * | 2020-05-20 | 2020-07-17 | 国网河南省电力公司商丘供电公司 | Single-phase earth fault positioning method for power distribution overhead cable hybrid line |
| CN111505445A (en) * | 2020-05-25 | 2020-08-07 | 广州市奔流电力科技有限公司 | Credibility detection method and device for mutual-user relationship of transformer area and computer equipment |
| CN111596173A (en) * | 2020-06-06 | 2020-08-28 | 张朝 | Information fusion line selection method based on ETL technology correction |
| CN114660418A (en) * | 2022-05-24 | 2022-06-24 | 国网山西省电力公司大同供电公司 | Power distribution network single-phase earth fault line selection method based on feature fusion and clustering |
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Cited By (17)
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| CN104977499B (en) * | 2015-07-23 | 2018-05-08 | 中国电力科学研究院 | A kind of single-phase ground fault line selecting method of small-electric current grounding system |
| CN104977499A (en) * | 2015-07-23 | 2015-10-14 | 中国电力科学研究院 | Small current grounding system single-phase grounding fault line selection method |
| CN105911414A (en) * | 2016-04-27 | 2016-08-31 | 福州大学 | Fuzzy theory based power distribution network multi-criteria integrated fault line selection method |
| CN105974254A (en) * | 2016-05-16 | 2016-09-28 | 国网江苏省电力公司连云港供电公司 | Transient and steady state line selection method based on voltage calculation comprehensive weight |
| CN105974254B (en) * | 2016-05-16 | 2019-01-04 | 国网江苏省电力公司连云港供电公司 | The temporary stable state selection method of comprehensive weight is calculated based on voltage |
| CN106019047A (en) * | 2016-05-18 | 2016-10-12 | 成都理工大学 | Comprehensive line selection fault measurement calculation method for small-current grounding system |
| CN106443350A (en) * | 2016-10-20 | 2017-02-22 | 南方电网科学研究院有限责任公司 | Arc suppression coil grounding system fault line selection method, device and equipment |
| CN106443350B (en) * | 2016-10-20 | 2019-04-19 | 南方电网科学研究院有限责任公司 | Fault-line selecting method, device and the equipment of arc suppression coil earthing system |
| CN107121622A (en) * | 2017-06-16 | 2017-09-01 | 山东电工电气集团新能科技有限公司 | The method that novel fault is indicated system and earth fault is indicated using the system |
| CN108226709A (en) * | 2017-12-20 | 2018-06-29 | 南京威尔泰电气工程有限公司 | A kind of small current neutral grounding faulty line selection method |
| CN109459663A (en) * | 2018-12-21 | 2019-03-12 | 青岛理工大学 | A kind of intelligent distribution network fault section location method based on Multiple Time Scales |
| CN110579684A (en) * | 2019-09-04 | 2019-12-17 | 安徽沃华电力设备有限公司 | low-current grounding system line selection method based on fusion algorithm |
| CN111426982A (en) * | 2020-05-20 | 2020-07-17 | 国网河南省电力公司商丘供电公司 | Single-phase earth fault positioning method for power distribution overhead cable hybrid line |
| CN111505445A (en) * | 2020-05-25 | 2020-08-07 | 广州市奔流电力科技有限公司 | Credibility detection method and device for mutual-user relationship of transformer area and computer equipment |
| CN111596173A (en) * | 2020-06-06 | 2020-08-28 | 张朝 | Information fusion line selection method based on ETL technology correction |
| CN114660418A (en) * | 2022-05-24 | 2022-06-24 | 国网山西省电力公司大同供电公司 | Power distribution network single-phase earth fault line selection method based on feature fusion and clustering |
| CN114660418B (en) * | 2022-05-24 | 2022-08-23 | 国网山西省电力公司大同供电公司 | Power distribution network single-phase earth fault line selection method based on feature fusion and clustering |
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