CN104898029A - Similarity single-phase earth fault line selection method based on active full compensation arc suppression control - Google Patents
Similarity single-phase earth fault line selection method based on active full compensation arc suppression control Download PDFInfo
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Abstract
The present invention discloses a similarity single-phase earth fault line selection method based on active full compensation arc suppression control. In a small current grounding system, an active full compensation arc suppression control device replaces an arc suppression coil compensation device; when a single-phase earth fault occurs, circuit zero-sequence current at a compensation stage is notably characterized in that neither the size nor the direction of non-fault circuit zero-sequence current is changed while both the amplitude and the phase position of a fault line are changed; at the compensation stage, similarity analysis is carried out in pairs on zero-sequence current waveforms of all circuits to obtain a similarity coefficient matrix, every row of the coefficient matrix is added to obtain a series of comprehensive similarity coefficient values, and thus the circuit corresponding to the minimum comprehensive similarity coefficient is the fault circuit. With adoption of the method provided by the present invention, compensation and arc suppression aims are achieved when single-phase earth faults occur in a system, the rapidity is also ensured, rapidity and accuracy in fault line selection are realized during compensation, and interferences of other signals on the system are also avoided.
Description
Technical field
The invention belongs to electrical network earth fault line selection technical field, relate to a kind of fault line selection method for single-phase-to-ground fault, particularly a kind of similarity fault line selection method for single-phase-to-ground fault based on active control of the entire compensation arc-suppression.
Background technology
Safe, stable, the reliability service of power distribution network, is the basis ensureing the national economic development, has consequence in social life.Current domestic power distribution network adopts small current neutral grounding (isolated neutral or through the grounding through arc) method of operation mostly.Often singlephase earth fault is there is in system operation.When system cloud gray model, the fault current produced due to singlephase earth fault is very little, smaller to the harm of the health of people, power equipment and communication, although low current grounding can not produce tremendous influence to mains supply, but the superpotential that this fault causes can endanger line insulation, if cause phase fault thus, then the accident is made to expand.Tradition countermeasure produces inductance current at neutral point place access arc suppression coil, offsets, thus reduce ground current, to reach the object of extinguishing arc with system capacitive current.For preventing fault from expanding further, also judge that faulty line is significant exactly in time.
The fault detection method of current small current system can be divided into active and passive type two kinds of detection modes according to using the mode difference of signal.Active detection method is by the signal injection of regulation in electrical network, and the method easily produces certain interference to the systems stabilisation after compensation, affects ground current and even causes arcing again.And passive type is the voltage, the current signal that produce after occurring based on fault.From now concrete applicable cases, use passive detection mode to account for the overwhelming majority, in recent years, along with a large amount of uses of cable line, a lot of 10kV and 6kV electrical network transform grounding through arc mode gradually as.Grounding through arc failure line selection can characteristic quantity less, and often kind of fault signature is not very reliable, and some other Injection Signal selection method can produce certain disturbance to compensating stable system, affects ground current and even causes arcing again.
Summary of the invention
For the deficiency of above-mentioned background technology, the invention provides a kind of similarity fault line selection method for single-phase-to-ground fault based on active control of the entire compensation arc-suppression device.
The technical solution adopted in the present invention is: a kind of similarity fault line selection method for single-phase-to-ground fault based on active control of the entire compensation arc-suppression, is applied in the system of active full compensating arc-extinguishing coil; It is characterized in that: in small current neutral grounding system, use active control of the entire compensation arc-suppression device to replace arc suppression coil compensation device; After singlephase earth fault occurs, there is obvious characteristic at compensated stage circuit zero-sequence current, described obvious characteristic is that non-fault line zero-sequence current size and Orientation does not all change, and the amplitude of faulty line, phase place all can change; At compensated stage, similarity analysis is between two carried out to each bar circuit zero sequence current waveform, obtains a coefficient of similarity matrix, by every for matrix of coefficients a line summation, obtain a series of analogue forecasting method value, then the circuit corresponding to minimum comprehensive similarity coefficient is faulty line.
As preferably, described compensation system is made up of DC side power supply, single-phase full-bridge inverter, outputting inductance, adopts PWM to control.
As preferably, described carries out similarity analysis between two at compensated stage to each bar circuit zero sequence current waveform, its specific implementation process is: set the time of input compensation as t, the zero-sequence current component in 1/8 cycle after gathering the zero-sequence current component of 1/8 cycle before t and t respectively, the zero-sequence current waveform namely altogether gathering 1/4 cycle of compensated stage carries out similarity judgement; The more traditional arc suppression coil selection method of this compensation selection method is more accurate, fast, and achieves the unification of compensation and route selection.
Feature of the present invention is:
(1) compensation system is that active control of the entire compensation arc-suppression device replaces traditional arc suppression coil, and shared volume ratio arc suppression coil is much smaller in systems in practice.Adopt PWM to control, accurate tracker capacity current, can follow the tracks of capacity current size and also can follow the tracks of phase place, compensates the response time fast;
(2) similarity selection method, be use at compensated stage, extract current signal characteristic component convenient, method is more accurate, can not produce interference to system;
(3) single-phase grounded malfunction in grounded system of low current can be met based on the selection method of this device to compensate route selection and carry out simultaneously.
Compensating arc distinction object when invention achieves system generation singlephase earth fault also ensure that its rapidity, and while compensating, also achieve the rapidity of failure line selection, accuracy, other signals avoided are to the interference of system.
Accompanying drawing explanation
Accompanying drawing 1: the one-phase earthing failure in electric distribution network system of the embodiment of the present invention simplifies zero-sequence network figure.
Embodiment
Understand for the ease of those of ordinary skill in the art and implement the present invention, below in conjunction with drawings and Examples, the present invention is described in further detail, should be appreciated that exemplifying embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
Small current neutral grounding single-phase grounding fault system comprises power supply, circuit, load, and compensation system, and during the fault that is short-circuited, its each its simplified network of bar circuit zero-sequence current figure is as Fig. 1.
The present invention, in small current neutral grounding system, uses active control of the entire compensation arc-suppression device to replace arc suppression coil compensation device; During small current neutral grounding system generation singlephase earth fault, access active full compensating arc distinction control device in property point place replaces traditional arc suppression coil compensation device to carry out full remuneration in systems in which.Obvious characteristic is there is: non-fault line zero-sequence current size and Orientation does not all change, and the amplitude of faulty line, phase place all can change at compensated stage circuit zero-sequence current.Therefore, utilize the greatest differences of compensated stage faulty line and non-fault line zero-sequence current wave-form similarity, can failure line selection be realized.
After small current neutral grounding system generation singlephase earth fault, use the inventive method for different faults situation, comprise different grounding resistance, different faults position, different compensativity, different faults combined floodgate degree.
A kind of similarity fault line selection method for single-phase-to-ground fault based on active control of the entire compensation arc-suppression provided by the invention, comprises the following steps:
The first step: after fault occurs, the 6ms moment compensates, if the time of input compensation is t, after gathering 1/8 cycle before t and t respectively, the zero-sequence current component of 1/8 cycle, namely gathers the zero-sequence current component of compensated stage 1/4 cycle altogether,
Second step: the cross-correlation coefficient obtaining any two circuit p, q zero-sequence currents.Similarity differentiation is carried out to each bar circuit zero-sequence current, draws similarity matrix.
3rd step: by every for similarity matrix a line summation, judge minimum value, the circuit corresponding to it is exactly faulty line.
The compensation system of the present embodiment is made up of DC side power supply, single-phase full-bridge inverter, outputting inductance, adopts PWM to control.
Active full compensating arc-extinguishing coil is replaced traditional arc suppression coil by the present invention, employing pwm converter controls, substantially increase the tracking accuracy of system capacity current, the sized phases of capacity current all can accurately be followed the tracks of, simultaneously the make-up time controls to get hold of to play good compensation effect, is to compensate that to utilize similarity based method to carry out route selection convenient simultaneously.Similarity selection method avoids arc suppression coil system selection method inaccurate shortcoming under various fault ' conditions in addition, it also avoid the shortcoming using other signal injection route selections large to system interference simultaneously.
Should be understood that, the part that this instructions does not elaborate all belongs to prior art.
Should be understood that; the above-mentioned description for preferred embodiment is comparatively detailed; therefore the restriction to scope of patent protection of the present invention can not be thought; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that the claims in the present invention protect; can also make and replacing or distortion, all fall within protection scope of the present invention, request protection domain of the present invention should be as the criterion with claims.
Claims (3)
1., based on a similarity fault line selection method for single-phase-to-ground fault for active control of the entire compensation arc-suppression, be applied in the system of active full compensating arc-extinguishing coil; It is characterized in that: in small current neutral grounding system, use active control of the entire compensation arc-suppression device to replace arc suppression coil compensation device; After singlephase earth fault occurs, there is obvious characteristic at compensated stage circuit zero-sequence current, described obvious characteristic is that non-fault line zero-sequence current size and Orientation does not all change, and the amplitude of faulty line, phase place all can change; At compensated stage, similarity analysis is between two carried out to each bar circuit zero sequence current waveform, obtains a coefficient of similarity matrix, by every for matrix of coefficients a line summation, obtain a series of analogue forecasting method value, then the circuit corresponding to minimum comprehensive similarity coefficient is faulty line.
2. the similarity fault line selection method for single-phase-to-ground fault based on active control of the entire compensation arc-suppression according to claim 1, is characterized in that: described compensation system is made up of DC side power supply, single-phase full-bridge inverter, outputting inductance, adopts PWM to control.
3. the similarity fault line selection method for single-phase-to-ground fault based on active control of the entire compensation arc-suppression according to claim 1, it is characterized in that: described carries out similarity analysis between two at compensated stage to each bar circuit zero sequence current waveform, its specific implementation process is: set the time of input compensation as t, the zero-sequence current component in 1/8 cycle after gathering the zero-sequence current component of 1/8 cycle before t and t respectively, the zero-sequence current waveform namely altogether gathering 1/4 cycle of compensated stage carries out similarity judgement.
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| CN109490718A (en) * | 2019-01-18 | 2019-03-19 | 云南电网有限责任公司电力科学研究院 | A kind of earth current based on controllable voltage source compensates selection method entirely |
| CN109507519A (en) * | 2018-12-14 | 2019-03-22 | 云南电力试验研究院(集团)有限公司 | A kind of earth fault line selection method, apparatus and system |
| CN109765463A (en) * | 2019-03-29 | 2019-05-17 | 云南电网有限责任公司电力科学研究院 | A kind of ground fault disappearance method of discrimination of controllable voltage compensation way |
| CN110261720A (en) * | 2019-08-06 | 2019-09-20 | 云南电网有限责任公司电力科学研究院 | The single-phase earthing method of discrimination and device of distribution net work earthing fault |
| CN110261721A (en) * | 2019-08-06 | 2019-09-20 | 云南电网有限责任公司电力科学研究院 | Single-phase earthing under active compensation mode differentiates and sentences phase method |
| CN111308264A (en) * | 2019-12-05 | 2020-06-19 | 国网湖北省电力有限公司恩施供电公司 | Power distribution network single-phase earth fault section positioning method based on cosine similarity |
| CN112083270A (en) * | 2020-08-14 | 2020-12-15 | 昆明理工大学 | Wind power plant current collection line single-phase earth fault line selection method based on correlation coefficient |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109507519A (en) * | 2018-12-14 | 2019-03-22 | 云南电力试验研究院(集团)有限公司 | A kind of earth fault line selection method, apparatus and system |
| CN109507519B (en) * | 2018-12-14 | 2021-01-26 | 云南电力试验研究院(集团)有限公司 | Low-current ground fault line selection method, device and system |
| CN109490718A (en) * | 2019-01-18 | 2019-03-19 | 云南电网有限责任公司电力科学研究院 | A kind of earth current based on controllable voltage source compensates selection method entirely |
| CN109765463A (en) * | 2019-03-29 | 2019-05-17 | 云南电网有限责任公司电力科学研究院 | A kind of ground fault disappearance method of discrimination of controllable voltage compensation way |
| CN109765463B (en) * | 2019-03-29 | 2020-10-02 | 云南电网有限责任公司电力科学研究院 | Ground fault disappearance discrimination method capable of controlling voltage compensation mode |
| CN110261720A (en) * | 2019-08-06 | 2019-09-20 | 云南电网有限责任公司电力科学研究院 | The single-phase earthing method of discrimination and device of distribution net work earthing fault |
| CN110261721A (en) * | 2019-08-06 | 2019-09-20 | 云南电网有限责任公司电力科学研究院 | Single-phase earthing under active compensation mode differentiates and sentences phase method |
| CN111308264A (en) * | 2019-12-05 | 2020-06-19 | 国网湖北省电力有限公司恩施供电公司 | Power distribution network single-phase earth fault section positioning method based on cosine similarity |
| CN111308264B (en) * | 2019-12-05 | 2022-06-24 | 国网湖北省电力有限公司恩施供电公司 | Power distribution network single-phase earth fault section positioning method based on cosine similarity |
| CN112083270A (en) * | 2020-08-14 | 2020-12-15 | 昆明理工大学 | Wind power plant current collection line single-phase earth fault line selection method based on correlation coefficient |
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Application publication date: 20150909 |