CN102928731A - Power distribution network fault line selection method using zero-sequence current full quantity Hough transformation - Google Patents
Power distribution network fault line selection method using zero-sequence current full quantity Hough transformation Download PDFInfo
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Abstract
The invention relates to a power distribution network fault line selection method using zero-sequence current full quantity Hough transformation and belongs to the technical field of relay protection of an electrical power system. When a single-phase ground fault of a power distribution network occurs, fault zero-sequence current can be obtained according to three-phase current measured at a protective installing position, zero-sequence current data of each feeder of a 1.5ms short time window is extracted, Hough transformation is conducted, an included angle in the direction of overall changes of an overall change trend at a zero-sequence current full quantity initial phase is formed, relation between the zero-sequence current full quantity initial stage change direction of each feeder and the overall change direction is compared, and power distribution network fault line selection is achieved. By means of the method, noise interference resisting performance of the line selection method can be effectively improved, fault feeders under the condition of small fault angles and high-resistance ground faults can be identified, and fault initial transient data loss can not affect the effectiveness of the line selection method. Simultaneously, the method is good in robustness and is not subject to effects of arc faults, non-linear load influence and the like, requirements for hardware sampling speed are greatly reduced, and good practicality is achieved.
Description
Technical field
The present invention relates to a kind of distribution network fault line selection method that utilizes zero-sequence current full dose Hough conversion, belong to the Relay Protection Technology in Power System field.
Background technology
During the power distribution network generation singlephase earth fault of neutral by arc extinction coil grounding mode, the fault transient state current amplitude is much larger than steady-state current, and not affected by arc suppression coil.Transient state component after the fault is compared with steady-state component and is had an enormous advantage, so that become first choice of the failure line selection based on the selection method of transient.
Based on the selection method of transient, mostly be based on transient faulty line and perfect the difference that circuit shows on the features such as sudden change direction, amplitude, extract these features by signal processing means, and then carry out fault identification.Distribution network failure mostly is singlephase earth fault, and its route selection problem is difficult to solve always, and main cause is: 1. failure boundary is complicated, at random, and is big or small such as fault prima facies angle size, fault distance, transition resistance.The different faults condition, transient state zero sequence signal frequency content, attenuation characteristic, spectrum energy distribute and have larger difference; 2. when near the voltage over zero singlephase earth fault occuring, the high fdrequency component that causes is very little, and the sensitivity of high frequency transient amount selection method descends greatly; 3. differing greatly of cable line and overhead transmission line electrical specification and each line length perfected similarity variation between the circuit zero sequence current waveform; 4. adopt row ripple detection method, the row velocity of wave propagation is very fast, and distribution network line is shorter, and the interference of power distribution network signal is more in addition, and row ripple Mintrop wave head is difficult for reliable the seizure.
Summary of the invention
The objective of the invention is to overcome the weak point of existing traveling wave method failure line selection, proposed a kind of distribution network fault line selection method that utilizes zero-sequence current full dose Hough conversion, the anti-noise jamming ability that this method can the Effective Raise selection method; Can identify the fault feeder in glitch angle, the high resistance earthing fault situation; Fault just blink data is lost the validity that also can not affect selection method, thereby overcome the shortcoming of the wave head fugitiveness of row ripple in the capable ripple selection method, simultaneously, this method robustness is good, be not subjected to the advantages such as electric arc fault, nonlinear-load affect, greatly reduce the requirement to the hardware sampling rate, stronger practicality is arranged.
The technical solution used in the present invention is: behind power distribution network generation singlephase earth fault; starting element starts immediately; the three-phase current that records according to the protection installation place can get the fault zero-sequence current; extract each feeder line zero-sequence current data of 1.5ms short time-window; carry out the Hough conversion; construct " integral body " sudden change angular separation of zero-sequence current full dose initial period overall variation trend; relatively each feeder line zero-sequence current full dose initial period sudden change direction and " integral body " prominent nyctitropic relation; according to fault feeder zero-sequence current full dose initial period sudden change direction and " integral body " sudden change opposite direction; it is identical with " integral body " sudden change direction to perfect feeder line zero-sequence current full dose, realizes distribution network fault line selection.
Distribution network fault line selection method specifically carries out according to following step:
(1) after power distribution network broke down, starting element started immediately, and the three-phase current that records according to the protection installation place can get the fault zero-sequence current
:
(1)
In the formula:
,
,
Be respectively faulty line A, B, C three-phase current;
k=1,2,3
N,
NBe sample sequence length;
(2) each feeder line zero-sequence current data of 1.5ms short time-window generate JPG form X-Y scheme behind the extraction distribution network failure, through the angle of Hough straight line that conversion is extracted and plane x axle
θCan characterize zero-sequence current full dose initial period sudden change direction character;
(3) characterize angle by sign function sgn
θCharacter, existing definition
Be " integral body " sudden change direction of all feeder line zero-sequence current full dose initial periods, wherein
Value be 1 and-1,1 represents whole sudden change direction for just ,-1 represent whole sudden change direction be to bear.In the formula,
Be the feeder line number;
(4) determine
jBar feeder line zero-sequence current full dose initial period sudden change direction and all feeder lines " integral body " sudden change direction are
In the formula
Value is 1 and-1; The route selection criterion is judged during according to distribution network system generation singlephase earth fault.
The route selection criterion is during distribution network system generation singlephase earth fault,
If
Be at-1 o'clock, characterize the
jBar feeder line zero-sequence current full dose initial period sudden change direction and all feeder lines " integral body " sudden change opposite direction, namely the
jThe bar feeder line is judged to be fault feeder;
If
Be 1 o'clock, characterize the
jBar feeder line zero-sequence current full dose initial period sudden change direction and all feeder lines " integral body " direction of suddenling change is identical, and namely the
jThe bar feeder line is judged to be and perfects feeder line.When all feeder lines are identified as when perfecting feeder line, be judged to be bus-bar fault.
Beneficial effect of the present invention:
1, the anti-noise jamming ability that this method can the Effective Raise selection method.
2, the method can be identified the fault feeder in glitch angle, the high resistance earthing fault situation; Fault just blink data is lost the validity that also can not affect selection method, thereby has overcome the shortcoming of wavefront fugitiveness in the capable ripple selection method.
3, this method robustness is good, is not subjected to the advantages such as electric arc fault, nonlinear-load affect, and greatly reduces the requirement to the hardware sampling rate, and stronger practicality is arranged.
Description of drawings
The meaning figure of parameter in Fig. 1 Hough conversion (to straight line);
Fig. 2 is the distribution network system structural drawing that is used for emulation of embodiment 1;
Fig. 3 is the feeder line of embodiment 1
L 1The zero-sequence current oscillogram;
Fig. 4 is the feeder line of embodiment 1
L 2The zero-sequence current oscillogram;
Fig. 5 is the feeder line of embodiment 1
L 3The zero-sequence current oscillogram;
Fig. 6 is the feeder line of embodiment 1
L 4The zero-sequence current oscillogram;
Fig. 7 is the feeder line of embodiment 1
L 5The zero-sequence current oscillogram;
Fig. 8 is the feeder line of embodiment 1
L 6The zero-sequence current oscillogram.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail, understands to make things convenient for the technician.
Behind power distribution network generation singlephase earth fault; starting element starts immediately; the three-phase current that records according to the protection installation place can get the fault zero-sequence current; extract each feeder line zero-sequence current data of 1.5ms short time-window; carry out the Hough conversion; construct " integral body " sudden change angular separation of zero-sequence current full dose initial period overall variation trend; relatively each feeder line zero-sequence current full dose initial period sudden change direction and " integral body " prominent nyctitropic relation; according to fault feeder zero-sequence current full dose initial period sudden change direction and " integral body " sudden change opposite direction; it is identical with " integral body " sudden change direction to perfect feeder line zero-sequence current full dose, realizes distribution network fault line selection.
Distribution network fault line selection method specifically carries out according to following step:
(1) after power distribution network broke down, starting element started immediately, and the three-phase current that records according to the protection installation place can get the fault zero-sequence current
:
In the formula:
,
,
Be respectively faulty line A, B, C three-phase current;
k=1,2,3
N,
NBe sample sequence length;
(2) each feeder line zero-sequence current data of 1.5ms short time-window generate JPG form X-Y scheme behind the extraction distribution network failure, through the angle of Hough straight line that conversion is extracted and plane x axle
θCan characterize zero-sequence current full dose initial period sudden change direction character;
(3) characterize angle by sign function sgn
θCharacter, existing definition
Be " integral body " sudden change direction of all feeder line zero-sequence current full dose initial periods, wherein
Value be 1 and-1,1 represents whole sudden change direction for just ,-1 represent whole sudden change direction be to bear.In the formula,
Be the feeder line number;
(4) determine
jBar feeder line zero-sequence current full dose initial period sudden change direction and all feeder lines " integral body " sudden change direction are
In the formula
Value is 1 and-1; The route selection criterion is judged during according to distribution network system generation singlephase earth fault.
The route selection criterion is during distribution network system generation singlephase earth fault,
If
Be at-1 o'clock, characterize the
jBar feeder line zero-sequence current full dose initial period sudden change direction and all feeder lines " integral body " sudden change opposite direction, namely the
jThe bar feeder line is judged to be fault feeder;
If
Be 1 o'clock, characterize the
jBar feeder line zero-sequence current full dose initial period sudden change direction and all feeder lines " integral body " direction of suddenling change is identical, and namely the
jThe bar feeder line is judged to be and perfects feeder line.When all feeder lines are identified as when perfecting feeder line, be judged to be bus-bar fault.
Below be design concept of the present invention:
1. the distribution network fault line selection principle of zero-sequence current full dose Hough conversion
Behind the power distribution network generation singlephase earth fault, for window zero-sequence current data during 1.5ms behind each feeder fault, carry out the Hough conversion, the straight line that calculating is extracted and the angle of x axle, and angle corresponding to each feeder line carried out the sign function computing, carry out the sign function computing after the sign function result of calculation summation that each feeder line is corresponding, result of calculation is referred to as " integral body " sudden change direction again.Fault feeder zero-sequence current full dose initial period sudden change direction and " integral body " sudden change opposite direction, it is identical with " integral body " sudden change direction to perfect feeder line zero-sequence current full dose initial period sudden change direction.
2.Hough conversion is applicable to detect the always geometrical curve of shape.Point in the plane of delineation is mapped to parameter space according to the funtcional relationship of curve to be asked, then finds out maximum congealing point, finish conversion.Fundamental formular for straight line is:
As shown in Figure 1, x wherein, y represent respectively in the former coordinate system horizontal ordinate of arbitrary pixel and ordinate on certain straight line,
p,
θRepresent respectively that then this straight line is from the normal distance and the angle of this normal with respect to the x axle of initial point in the parameter space.
If a straight line equation is among the rectangular coordinate y-x:
Wherein,
kFor slope,
bBe intercept, thereon 2 points (
x 1,
y 1), (
x 2,
y 2), according to formula (2), set up equation:
Through can be calculated:
3. characterize angle by sign function sgn
θCharacter, existing definition
Be " integral body " sudden change direction of all feeder line zero-sequence current full dose initial periods, wherein
Value be 1 and-1,1 represents whole sudden change direction for just ,-1 represent whole sudden change direction be to bear.In the formula,
Be the feeder line number.
4. determine the
jBar feeder line zero-sequence current full dose initial period sudden change direction and all feeder lines " integral body " sudden change direction are
In the formula
Value is 1 and-1.During distribution network system generation singlephase earth fault, the route selection criterion is:
If
Be at-1 o'clock, characterize the
jBar feeder line zero-sequence current full dose initial period sudden change direction and all feeder lines " integral body " sudden change opposite direction, namely the
jThe bar feeder line is judged to be fault feeder;
If
Be 1 o'clock, characterize the
jBar feeder line zero-sequence current full dose initial period sudden change direction and all feeder lines " integral body " direction of suddenling change is identical, and namely the
jThe bar feeder line is judged to be and perfects feeder line.When all feeder lines are identified as when perfecting feeder line, be judged to be bus-bar fault
Embodiment 1:
As shown in Figure 2: 110kV/35kV one-phase earthing failure in electric distribution network realistic model, supply voltage is 110kV among the figure, is delivered to load side after transformer becomes 35kV, and it has 6 feeder lines, and the Z-shaped transformer neutral point is by arc suppression coil resistance in series ground connection.Overhead feeder
L 1=15km,
L 3=18km,
L 5=30km ， Xian – cable mixing feeder line
L 4=17km, its overhead feeder 12km, cable 5km, cable feeder line
L 2=6km,
L 6=8km.Wherein, overhead feeder is JS1 bar type, and LGJ-70 type wire, span 80m, cable feeder line are YJV23-35/95 type cable.G in this electrical network is infinitely great power supply; T is main-transformer, and no-load voltage ratio is 110 kV/35kV, and connection set is Y
N/ d11; T
ZIt is the zigzag transformer; L is arc suppression coil; R is the damping resistance of arc suppression coil.Feeder line adopts overhead transmission line, overhead line-cable hybrid line and three kinds of circuits of cable line.Load is selected the firm power load model.Apart from feeder line
L 1Singlephase earth fault occurs in 5 km places, top, stake resistance 20 Ω, and the fault angle is 60 °, sample frequency is 10kHz.
(1) after power distribution network broke down, starting element started immediately, feeder line
L 1To feeder line
L 6The zero-sequence current waveform such as Fig. 3 to shown in Figure 8, the time window data of choosing 0.5ms before 1ms after the fault, the fault generate the two dimensional image of JPG form, carry out the Hough conversion, the angle of calculated line and two dimensional surface x semiaxis, the zero-sequence current full dose initial period sudden change angular separation of extracting each feeder line.And angle corresponding to each feeder line carried out the sign function computing, and carry out again the sign function computing after the sign function result of calculation summation that each feeder line is corresponding, result of calculation is referred to as " integral body " sudden change direction.Fault feeder zero-sequence current full dose initial period sudden change direction and " integral body " sudden change opposite direction, it is identical with " integral body " sudden change direction to perfect feeder line zero-sequence current full dose initial period sudden change direction.Realize distribution network fault line selection based on this principle.
(2) carry out corresponding angle of each feeder line after the Hough conversion
, get sign function result of calculation,
=(1,1,1,1,1,1) is so can judge feeder line
L 1Be fault feeder.
Embodiment 2:110kV/35kV one-phase earthing failure in electric distribution network realistic model is identical with embodiment 1, apart from feeder line
L 2Singlephase earth fault occurs in 2 km places, top, stake resistance 200 Ω, and the fault angle is 30 °, sample frequency is 10kHz.Press the identical method of example 1, the time window data of choosing 0.5ms before 1ms after the fault, the fault generate the two dimensional image of JPG form, carry out corresponding angle of each feeder line after the Hough conversion
, get sign function result of calculation,
=(1 ,-1,1,1,1,1) is so can judge feeder line
L 2Be fault feeder.
The present invention describes by accompanying drawing, without departing from the present invention, can also carry out various conversion and be equal to replacement patent of the present invention, therefore, patent of the present invention is not limited to disclosed specific implementation process, and should comprise the whole embodiments that fall in the Patent right requirement scope of the present invention.
Claims (3)
1. distribution network fault line selection method that utilizes the Hough conversion of zero-sequence current full dose; it is characterized in that: behind power distribution network generation singlephase earth fault; starting element starts immediately; the three-phase current that records according to the protection installation place can get the fault zero-sequence current; extract each feeder line zero-sequence current data of 1.5ms short time-window; carry out the Hough conversion; construct " integral body " sudden change angular separation of zero-sequence current full dose initial period overall variation trend; relatively each feeder line zero-sequence current full dose initial period sudden change direction and " integral body " prominent nyctitropic relation; according to fault feeder zero-sequence current full dose initial period sudden change direction and " integral body " sudden change opposite direction; it is identical with " integral body " sudden change direction to perfect feeder line zero-sequence current full dose, realizes distribution network fault line selection.
2. a kind of distribution network fault line selection method that utilizes zero-sequence current full dose Hough conversion according to claim 1, it is characterized in that: distribution network fault line selection method specifically carries out according to following step:
(1) after power distribution network broke down, starting element started immediately, and the three-phase current that records according to the protection installation place can get the fault zero-sequence current
:
In the formula:
,
,
Be respectively faulty line A, B, C three-phase current;
k=1,2,3
N,
NBe sample sequence length;
(2) each feeder line zero-sequence current data of 1.5ms short time-window generate JPG form X-Y scheme behind the extraction one-phase earthing failure in electric distribution network, through the angle of Hough straight line that conversion is extracted and plane x axle
θCan characterize zero-sequence current full dose initial period sudden change direction character;
(3) characterize angle by sign function sgn
θCharacter, existing definition
Be " integral body " sudden change direction of all feeder line zero-sequence current full dose initial periods, wherein
Value be 1 and-1,1 represents whole sudden change direction for just ,-1 represent whole sudden change direction be to bear, in the formula,
Be the feeder line number;
(4) determine
jBar feeder line zero-sequence current full dose initial period sudden change direction and all feeder lines " integral body " sudden change direction are
In the formula
Value is 1 and-1; The route selection criterion is judged during according to distribution network system generation singlephase earth fault.
3. a kind of distribution network fault line selection method that utilizes zero-sequence current full dose Hough conversion according to claim 2, it is characterized in that: the route selection criterion is during distribution network system generation singlephase earth fault,
If
Be at-1 o'clock, characterize the
jBar feeder line zero-sequence current full dose initial period sudden change direction and all feeder lines " integral body " sudden change opposite direction, namely the
jThe bar feeder line is judged to be fault feeder;
If
Be 1 o'clock, characterize the
jBar feeder line zero-sequence current full dose initial period sudden change direction and all feeder lines " integral body " direction of suddenling change is identical, and namely the
jThe bar feeder line is judged to be and perfects feeder line, when all feeder lines are identified as when perfecting feeder line, is judged to be bus-bar fault.
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| CN103424669A (en) * | 2013-08-05 | 2013-12-04 | 昆明理工大学 | Route selection method for analyzing first principal component by utilizing principal component of zero-sequence current matrix of faulty feeder line |
| CN103424668A (en) * | 2013-08-05 | 2013-12-04 | 昆明理工大学 | Arc light ground fault continuous route selection method utilizing principal component analysis of zero-sequence current of feeder line and evidence theoretical integration |
| CN104597378A (en) * | 2015-01-26 | 2015-05-06 | 福州大学 | Fault line-selection method of power distribution network containing DG based on transient state non-power-frequency zero-sequence currents |
| CN109444657A (en) * | 2018-10-23 | 2019-03-08 | 南方电网科学研究院有限责任公司 | A kind of power distribution network high resistance earthing fault Section Location |
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| CN103424669A (en) * | 2013-08-05 | 2013-12-04 | 昆明理工大学 | Route selection method for analyzing first principal component by utilizing principal component of zero-sequence current matrix of faulty feeder line |
| CN103424668A (en) * | 2013-08-05 | 2013-12-04 | 昆明理工大学 | Arc light ground fault continuous route selection method utilizing principal component analysis of zero-sequence current of feeder line and evidence theoretical integration |
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| CN104597378B (en) * | 2015-01-26 | 2017-09-15 | 福州大学 | The fault-line selecting method of the power distribution network containing DG based on the non-power frequency zero-sequence current of transient state |
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| CN110320434A (en) * | 2019-07-03 | 2019-10-11 | 山东大学 | High resistive fault discrimination method and system based on zero-sequence current waveform Interval Slope curve |
| CN111308263A (en) * | 2019-12-03 | 2020-06-19 | 昆明理工大学 | High-resistance grounding fault detection method for power distribution network |
| CN112345880A (en) * | 2020-09-19 | 2021-02-09 | 昆明理工大学 | Double-fed wind power plant outgoing line fault phase selection method |
| CN112345880B (en) * | 2020-09-19 | 2022-06-21 | 昆明理工大学 | Double-fed wind power plant outgoing line fault phase selection method |
| CN112067948A (en) * | 2020-10-14 | 2020-12-11 | 长沙理工大学 | Fault line selection method, system and terminal for single-phase earth fault of power distribution network and readable storage medium |
| CN112067948B (en) * | 2020-10-14 | 2022-03-11 | 长沙理工大学 | Fault line selection method and system for single-phase earth fault of power distribution network |
| CN113721114A (en) * | 2021-09-13 | 2021-11-30 | 国网湖南省电力有限公司 | High-resistance earth fault line selection method, system and storage medium for resonant earth distribution network |
| CN113721114B (en) * | 2021-09-13 | 2024-01-19 | 国网湖南省电力有限公司 | High-resistance ground fault line selection method, system and storage medium for resonant ground power distribution network |
| CN117706276A (en) * | 2024-02-01 | 2024-03-15 | 昆明理工大学 | Power distribution network fault line selection method based on Prony algorithm feature extraction |
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Application publication date: 20130213 |