CN104655980A - Method for quickly identifying short trouble of adjacent lines with different voltage grades based on db4 wavelet decomposition - Google Patents
Method for quickly identifying short trouble of adjacent lines with different voltage grades based on db4 wavelet decomposition Download PDFInfo
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- CN104655980A CN104655980A CN201410618188.6A CN201410618188A CN104655980A CN 104655980 A CN104655980 A CN 104655980A CN 201410618188 A CN201410618188 A CN 201410618188A CN 104655980 A CN104655980 A CN 104655980A
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Abstract
The invention relates to a method for quickly identifying short trouble of adjacent lines with different voltage grades based on db4 wavelet decomposition, and belongs to the technical field of relay protection of electric power systems. The method comprises the following steps: when the short trouble of adjacent lines with different voltage grades happens, a measurement unit is used for measuring phase voltage of each phase of the lines, three-phase voltage data in a 2 ms time window is extracted, and high-frequency components of the phases on a first scale are gained after the three-phase voltage data is subjected to wavelet decomposition; then absolute values of sequences of the high-frequency components of the phases are integrated, and the maximum of the absolute values is gained; denary logarithm value of the maximum is taken as a criterion; if the denary logarithm value is greater than or equal to -2, the fact that the short trouble of the adjacent lines with different voltage grades happens is quickly judged, so that the quick judging of the short trouble of the adjacent lines with different voltage grades is realized. Theoretical analysis and a large amount of simulation show that the method is correct and effective.
Description
Technical field
The present invention relates to a kind of this side electric pressure adjacent lines short trouble method for quickly identifying non-based on db4 wavelet decomposition, belong to Relay Protection Technology in Power System field.
Background technology
Current route protection mainly concentrates on the protection of this circuit and has higher reliability, and failure message judgement aspect during line failure for different voltage grade lacks row and effective method.The main protection of current 220kV and Above Transmission Lines mainly comprises: vertical connection distance (direction) route protection and current comparison pilot protection.The pilot protection of so-called circuit; longitudinally be tied with the protective device of certain communication channel by transmission electric line two ends exactly; the electric parameters (direction etc. of electric current, power) of each end is passed to opposite end; the electric parameters at two ends is compared; with failure judgement in this line range or outside line range, thus determine whether cut off protected circuit.And along with the lifting of current electric power line voltage grade; article one, line fault can cause the electric parameters in neighboring voltage levels adjacent lines to fluctuate; and current power line main protection does not possess the reliable judgement to different voltage grade line fault information; thus; the difficult point of route protection be just to different voltage grade line fault reliable, identify rapidly; to guarantee to protect correct operation, even if excision fault, prevent fault effects from magnifying.
Summary of the invention
The technical problem to be solved in the present invention proposes a kind of this side electric pressure adjacent lines short trouble method for rapidly judging non-based on wavelet decomposition, is used for overcoming in current route protection to carry out the reliable shortcoming judged to this side electric pressure adjacent lines short trouble non-.
Technical scheme of the present invention is: a kind of this side electric pressure adjacent lines short trouble method for quickly identifying non-based on db4 wavelet decomposition, when this side electric pressure adjacent lines non-is short-circuited fault, measuring unit records the three-phase voltage of transformer, three-phase voltage data during extraction 2ms in window
right
carry out db4 wavelet decomposition, ask for the absolute value of the high fdrequency component under the first yardstick
then the integration maximal value of each phase absolute value of gained is asked for
finally ask for the denary logarithm value M of this maximal value: when M is more than or equal to-2, be judged to be this side electric pressure adjacent lines short trouble non-; Otherwise judge that it normally runs.
Concrete steps are:
(1) when this side electric pressure adjacent lines non-is short-circuited fault, detected by measuring unit and record three-phase voltage;
(2) extract circuit be short-circuited fault time 2ms time window in three-phase voltage data u
a[n], u
b[n], u
c[n], A, B, C are the numbering of Three-Phase Transformer, and n is discrete signal n-th sampling node;
(3) right
carry out db4 wavelet decomposition, ask for the high fdrequency component absolute value sequence under the first yardstick
(4) following formula is utilized to ask for each phase
integrated value
Get its maximal value
sampled point number in window when wherein N is 2ms, i represents i-th sampled point of discrete signal,
(5) following formula is utilized to ask for
denary logarithm value M:
If M >=-2, be then judged to be this side electric pressure adjacent lines short trouble non-;
Otherwise, judge that it normally runs.
Principle of the present invention is:
One, wavelet transformation high fdrequency component is asked for
To the three-phase voltage extracted
carry out db4 wavelet transformation, the high fdrequency component under utilizing following formula to ask for the first yardstick
In formula, h [p] is small echo Hi-pass filter coefficient, h [p]=[0.2304,0.7148,0.6309 ,-0.0280 ,-0.1870,0.0308,0.0329 ,-0.0106]; P is discrete signal p sampled point,
Two, the asking for of integrated value
When this side electric pressure adjacent lines non-is short-circuited fault, device starts immediately, and measuring unit starts to record ripple, three-phase voltage data u in window during extraction 2ms
a[n], u
b[n], u
c[n], A, B, C are the numbering of circuit three-phase.The high fdrequency component absolute value that wavelet decomposition obtains under the first yardstick is carried out to each phase voltage
each phase is calculated by following formula
integrated value
In formula: sampled point number in window when N is 2ms, i is discrete signal i-th sampled point;
Three, this side electric pressure adjacent lines non-is short-circuited the judgement of fault
This side electric pressure adjacent lines non-is short-circuited after fault, includes the high fdrequency component that fault produces in each phase voltage,
value should be larger; Then can not high fdrequency component be produced when circuit normally runs,
maximal value trends towards 0.By formula (2) to each phase gained
integration also gets maximal value
Right
ask for its denary logarithm value M, be then the short-circuited criterion of fault of this side electric pressure adjacent lines non-is:
M≥-2 (3)
The invention has the beneficial effects as follows:
(1) the three-phase voltage data of 2ms after this method only needs fault or interference to occur, institute's window that takes is shorter, without the need to introducing the magnitude of current.
(2) this method only needs to compare Fmax, and whether the denary logarithm value of φ is more than or equal to-2, does not need to adjust respectively threshold value for different operating condition.
Accompanying drawing explanation
Fig. 1 is this side electric pressure adjacent lines short-circuit simulation system model non-built that the present invention utilizes in pscad emulation platform;
Three-phase voltage when Fig. 2 is step down side of the present invention generation A phase earth fault;
The high fdrequency component absolute value sequence of each phase voltage when Fig. 3 is step down side of the present invention generation A phase earth fault;
Three-phase voltage when Fig. 4 is step down side generation three phase short circuit fault of the present invention;
The high fdrequency component absolute value sequence of each phase voltage when Fig. 5 is step down side generation three phase short circuit fault of the present invention;
Fig. 6 is the three-phase voltage of step down side of the present invention when normally running;
Fig. 7 is the high fdrequency component absolute value sequence of step down side of the present invention each phase voltage when normally running;
Fig. 8 is steps flow chart schematic diagram of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Based on this side electric pressure adjacent lines short trouble method for quickly identifying non-of db4 wavelet decomposition, when this side electric pressure adjacent lines non-is short-circuited fault, measuring unit records the three-phase voltage of transformer, three-phase voltage data during extraction 2ms in window
right
carry out db4 wavelet decomposition, ask for the absolute value of the high fdrequency component under the first yardstick
then the integration maximal value of each phase absolute value of gained is asked for
finally ask for the denary logarithm value M of this maximal value: when M is more than or equal to-2, be judged to be this side electric pressure adjacent lines short trouble non-; Otherwise judge that it normally runs.
Concrete steps are:
(1) when this side electric pressure adjacent lines non-is short-circuited fault, detected by measuring unit and record three-phase voltage;
(2) extract circuit be short-circuited fault time 2ms time window in three-phase voltage data u
a[n], u
b[n], u
c[n], A, B, C are the numbering of Three-Phase Transformer, and n is discrete signal n-th sampling node;
(3) right
carry out db4 wavelet decomposition, ask for the high fdrequency component absolute value sequence under the first yardstick
(4) following formula is utilized to ask for each phase
integrated value
Get its maximal value
sampled point number in window when wherein N is 2ms, i represents i-th sampled point of discrete signal,
(5) following formula is utilized to ask for F
max, φdenary logarithm value M:
If M >=-2, be then judged to be this side electric pressure adjacent lines short trouble non-;
Otherwise, judge that it normally runs.
Embodiment 1: set up Simulation Model as shown in Figure 1, wherein transformer is a three-phase transformer, adopt △/y connection, its parameter is as follows: rated capacity is 600MVA, and nominal transformation ratio is 220kV/525kV.
Now suppose that in circuit TLineM2, A phase earth fault occurs in transformer 220kV side, stake resistance is assumed to be 0, and under the model, each phase voltage data as shown in Figure 2.Data after starting each phase device respectively during 2ms in window carry out db4 wavelet transformation, and the absolute value sequence of high fdrequency component under asking for this kind of fault under each first yardstick mutually as shown in Figure 3.Integration is carried out to the absolute value sequence of each phase gained, and asks for the maximal value 0.0439 in three-phase integrated value with max function.Its logarithm value is more than or equal to-2, is judged to be that 220kV side line road is short-circuited fault according to criterion, consistent with hypothesis, correct judgment.
Embodiment 2: set up Simulation Model as shown in Figure 1, its parameter elaborates in embodiment 1, is not repeated here.Now suppose that in circuit TLineM2, three phase short circuit fault occurs in transformer 220kV side, under the model, each phase voltage as shown in Figure 4.
Data time after selecting device starts in 2ms in window carry out db4 wavelet transformation, the absolute value sequence of the high fdrequency component under asking for this kind of fault under each first yardstick mutually as shown in Figure 5, respectively integration is carried out to each phase gained absolute value sequence, and get its maximal value 0.0593.Know that its logarithm is obviously be more than or equal to-2 by embodiment 1, be judged to be that 220kV side line road is short-circuited fault according to criterion, consistent with hypothesis, correct judgment.
Embodiment 3: set up Simulation Model as shown in Figure 1, its parameter elaborates in embodiment 1, is not repeated here.Now suppose that in circuit TLineM2, transformer 220kV side is normally run, under the model, each phase voltage as shown in Figure 6.
Data time after selecting device starts in 2ms in window carry out db4 wavelet transformation, and the absolute value sequence of the high fdrequency component under asking for this kind of fault under each first yardstick mutually as shown in Figure 7, is approximately zero.Respectively integration is carried out to each phase gained absolute value sequence, and get its maximal value 3.1378e-07.Its logarithm value is necessarily less than-2, is judged to be that 220kV side line road is normally run according to criterion, consistent with hypothesis, correct judgment.
Following table is the statistics when this side electric pressure adjacent lines generation different faults non-, and wherein Ag, AB, ABN represent A phase short circuit grounding, AB phase fault, AB phase fault ground connection respectively, and Rg represents stake resistance:
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 that those of ordinary skill in the art possess, various change can also be made under the prerequisite not departing from present inventive concept.
Claims (2)
1. this side electric pressure adjacent lines short trouble method for quickly identifying non-based on db4 wavelet decomposition, it is characterized in that: when this side electric pressure adjacent lines non-is short-circuited fault, measuring unit records the three-phase voltage of transformer, three-phase voltage data during extraction 2ms in window
right
carry out db4 wavelet decomposition, ask for the absolute value of the high fdrequency component under the first yardstick
then the integration maximal value of each phase absolute value of gained is asked for
finally ask for the denary logarithm value M of this maximal value: when M is more than or equal to-2, be judged to be this side electric pressure adjacent lines short trouble non-; Otherwise judge that it normally runs.
2. this side electric pressure adjacent lines short trouble method for quickly identifying non-based on db4 wavelet decomposition according to claim 1, is characterized in that concrete steps are:
(1) when this side electric pressure adjacent lines non-is short-circuited fault, detected by measuring unit and record three-phase voltage;
(2) extract circuit be short-circuited fault time 2ms time window in three-phase voltage data u
a[n], u
b[n], u
c[n], A, B, C are the numbering of Three-Phase Transformer, and n is discrete signal n-th sampling node;
(3) right
carry out db4 wavelet decomposition, ask for the high fdrequency component absolute value sequence under the first yardstick
(4) following formula is utilized to ask for each phase
integrated value
Get its maximal value
sampled point number in window when wherein N is 2ms, i represents i-th sampled point of discrete signal,
(5) following formula is utilized to ask for
denary logarithm value M:
If M >=-2, be then judged to be this side electric pressure adjacent lines short trouble non-;
Otherwise, judge that it normally runs.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107561400A (en) * | 2017-08-30 | 2018-01-09 | 国家电网公司 | A kind of distribution network short circuit fault quick determination method based on real-time wavelet conversion |
| CN109246215A (en) * | 2018-09-10 | 2019-01-18 | 西门子电力自动化有限公司 | For obtaining the method and terminal of the fault data of relay in electric system |
| CN112147536A (en) * | 2020-09-07 | 2020-12-29 | 广东电网有限责任公司广州供电局 | Current-amount-based short-circuit fault rapid detection method |
| CN112415304A (en) * | 2020-10-30 | 2021-02-26 | 国网天津市电力公司 | Line identification method based on low-voltage transformer area voltage data curve grouping |
| CN115394028A (en) * | 2022-08-25 | 2022-11-25 | 成都数之联科技股份有限公司 | Fire point monitoring system, method, device and medium |
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