CN116760846A - Double-end fault recording data synchronization method and system based on first zero crossing point identification - Google Patents
Double-end fault recording data synchronization method and system based on first zero crossing point identification Download PDFInfo
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Abstract
The application relates to the technical field of fault recording data synchronization of a power distribution network, and particularly discloses a double-end fault recording data synchronization method and system based on first zero crossing point identification, wherein the method comprises the following steps: calculating the effective value difference of each section and the slope square sum difference of each section based on a signal with a set length taking each zero crossing point in single-ended fault wave recording data as a starting point, and recording the zero crossing point corresponding to the effective value difference of the previous section as a if the effective value difference of two continuous sections is larger than a set first coefficient; if the square sum difference of two continuous sections of slopes is larger than a set second coefficient, recording the zero crossing point corresponding to the square sum difference of the previous section of slopes as b; if a and b are the same zero crossing point, the end signal takes the zero crossing point as the first zero crossing point, and the double-end signal respectively takes the respective obtained first zero crossing point as a synchronous reference to carry out data synchronization. The application can effectively avoid some invalid zero crossing points after the fault occurs, and improves the self-synchronizing success rate of the zero crossing points.
Description
Technical Field
The application relates to the technical field of fault recording data synchronization of power distribution networks, in particular to a double-end fault recording data synchronization method and system based on first zero crossing point identification.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The double-end fault recording data synchronization of the distribution line is beneficial to accurate fault analysis, correct action of the current differential protection relay and fault ranging accuracy based on double-end synchronization data, and has important significance for normal operation of a power grid.
When a short circuit fault occurs in a line, fault currents flowing through the double-end wave recorder are different, starting time based on a phase current mutation mark is also different, and the starting time error is ignored in the traditional data self-synchronization by taking the starting time as a reference to perform double-end data synchronization, so that synchronization accuracy is reduced. The first zero crossing point before the fault moment of the double-end recording data is used as a reference to perform data synchronization alignment, so that the fault recording data synchronization error at the two ends of the line is smaller than a data sampling period.
Therefore, the first zero crossing point before the fault of the fault wave recording data at the two ends of the power transmission line is accurately identified, the first zero crossing point is used as a double-end data synchronization reference, waveform alignment is carried out, and the accuracy of double-end data synchronization can be effectively improved.
In the prior art, for the identification of the first zero crossing point before failure, the method is to first search the zero crossing point forward by taking the starting time of the protection starting element as the starting point; however, some ineffective zero crossings may be caused due to amplitude variation or signal high-frequency oscillation after the fault occurs; in order to screen out the invalid zero crossing point between the real fault moment and the starting moment of the protection starting element, the invalid zero crossing point needs to be screened out according to the combination of the amplitude value of fault current at two ends of the distribution line and the positive and negative of the slope of the zero crossing point. When the method is used, signals at two ends of a distribution line are matched with each other, meanwhile, invalid zero crossing points are frequently screened out by combining with invalid zero crossing point screening criteria, and when the method faces a complex fault environment, the possibility of failure in screening out the invalid zero crossing points exists, so that the identification accuracy of the first zero crossing point can be affected.
Disclosure of Invention
In order to solve the problems, the application provides a double-end fault recording data synchronization method and a double-end fault recording data synchronization system based on first zero crossing point identification, which utilize two criteria of signal amplitude and point slope change to mutually verify when a recording signal fault occurs to determine a zero crossing point interval where the fault occurs, and can accurately identify the first zero crossing point before the fault occurs; and the double-end signals respectively take the first zero crossing points obtained by the double-end signals as synchronous references to realize data synchronous alignment.
In some embodiments, the following technical scheme is adopted:
a double-end fault recording data synchronization method based on first zero crossing point identification comprises the following steps:
acquiring all zero crossing points in the single-ended fault record data; calculating the effective value of each section of signal and the sum of squares of slopes of all points in each section of signal based on the signals with set length taking each zero crossing point as a starting point;
making a difference between the effective value of each section of signal and the effective value of the first section of signal, and marking the difference as the effective value difference of each section; making a difference between the sum of squares of the slopes of all points of each section of signal and the sum of squares of the slopes of all points of the first section of signal, and recording the sum of squares of the slopes of each section of signal as a sum difference;
if the effective value difference of two continuous sections is larger than the set first coefficient, recording the zero crossing point corresponding to the effective value difference of the previous section as a; if the square sum difference of two continuous sections of slopes is larger than a set second coefficient, recording the zero crossing point corresponding to the square sum difference of the previous section of slopes as b;
if a and b are the same zero crossing point, the end signal takes the zero crossing point as the first zero crossing point; otherwise, modifying the first coefficient and/or the second coefficient until a and b are the same zero crossing point;
and the double-end signals respectively take the first zero crossing points obtained by the double-end signals as synchronous references to carry out data synchronization.
As a further scheme, the first coefficient and/or the second coefficient is modified until a and b are the same zero crossing point, which comprises the following specific steps:
(1) reducing the value of the first coefficient, and judging whether the first coefficient is larger than zero or not; if yes, entering (2); otherwise, entering (3);
(2) searching a zero crossing point a again based on the modified first coefficient, and if new a and b are the same zero crossing point, determining the zero crossing point as the first zero crossing point; if not, returning to (1);
(3) reducing the second coefficient, searching for a zero crossing point b again based on the modified second coefficient, and judging whether the new zero crossing point b and the zero crossing point a found by the first coefficient modified last time are the same zero crossing point; if yes, the zero crossing point is the first zero crossing point; if not, repeating the step (3) until the condition that a and b are the same zero crossing point is met.
Based on fault recording data of each end, obtaining a first zero crossing point of the end; and the double-end signals respectively take the first zero crossing points obtained by the double-end signals as synchronous references to carry out data synchronization.
In other embodiments, the following technical solutions are adopted:
a double-ended fault recording data synchronization system based on first zero crossing point identification, comprising:
the data acquisition module is used for acquiring all zero crossing points in the single-ended fault wave recording data; calculating the effective value of each section of signal and the sum of squares of slopes of all points in each section of signal based on the signals with set length taking each zero crossing point as a starting point;
the data calculation module is used for making a difference between the effective value of each section of signal and the effective value of the first section of signal and recording the difference as the effective value difference of each section of signal; making a difference between the sum of squares of the slopes of all points of each section of signal and the sum of squares of the slopes of all points of the first section of signal, and recording the sum of squares of the slopes of each section of signal as a sum difference;
the first zero-crossing judging module is used for recording that the zero-crossing corresponding to the previous section of effective value difference is a when the two sections of continuous effective value differences are larger than the set first coefficient; when the square sum difference of two continuous sections of slopes is larger than a set second coefficient, recording the zero crossing point corresponding to the square sum difference of the previous section of slopes as b; if a and b are the same zero crossing point, the end signal takes the zero crossing point as the first zero crossing point; otherwise, modifying the first coefficient and/or the second coefficient until a and b are the same zero crossing point;
and the data synchronization module is used for carrying out data synchronization by taking the first zero crossing points obtained by the two-end signals respectively as synchronization references.
Compared with the prior art, the application has the beneficial effects that:
(1) The application uses two criteria of signal amplitude and change of point slope to verify each other when the wave recording signal fault occurs to determine the zero crossing point interval of the fault at the moment, and can accurately identify the first zero crossing point before the fault occurs. The method can directly and accurately find the first zero crossing point, can effectively avoid some invalid zero crossing points caused by amplitude change and signal high-frequency oscillation after the fault occurs, and improves the self-synchronizing success rate of zero crossing point data.
Additional features and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
FIG. 1 is a flowchart of a double-end fault recording data synchronization method based on first zero crossing point identification in an embodiment of the application;
fig. 2 is a diagram of load side recording data when a two-phase short circuit fault occurs in a 110kV transmission line in an embodiment of the application;
FIG. 3 is a schematic diagram of effective values of signals of each segment according to an embodiment of the present application;
FIG. 4 is a schematic diagram of the sum of squares of the slopes of each point of each segment of the signal according to an embodiment of the present application;
FIG. 5 is a schematic diagram of the effective value differences of the signals of each segment according to an embodiment of the present application;
FIG. 6 is a schematic diagram of the sum of squares difference of the slopes of each point of the signal segments in an embodiment of the present application.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Example 1
Generally, as the signal mutation is often accompanied when a fault occurs, a point with larger slope change exists in a signal with a half power frequency period length taking the first zero crossing point before the fault as a starting point, and the slope square sum of each sampling point of the signal has larger change compared with the slope square sum of each sampling point of the half power frequency period signal in a non-fault section, so that the first zero crossing point before the fault can be found through the slope square sum difference, and the accuracy of the found first zero crossing point is higher because the slope square sum of each sampling point changes more before and after the fault; however, certain deviations may also exist.
In addition, when a fault occurs, the amplitude of the fault signal at the load side also changes, however, the amplitude of the change may be smaller, and only the first zero crossing point before the fault is found by the effective value difference, the wrong zero crossing point may be found.
In the embodiment, the zero crossing points a and b found by comparing two criteria are mutually verified based on whether the two zero crossing points are the same, and if the fault points obtained by the two criteria are the same, the found fault point is considered to be the first zero crossing point before the fault; this allows to find the first zero crossing before the fault more accurately.
Based on the above, in one or more embodiments, a double-end fault recording data synchronization method based on first zero crossing point identification is disclosed, the method can obtain a first zero crossing point before a fault of each end based on fault recording data of the end, and further, double ends can perform data synchronization according to the first zero crossing point before the fault found by each end as a reference, so that the synchronization error of the fault recording data of the two ends is ensured to be smaller than one data sampling period.
Referring to fig. 1, the method in this embodiment specifically includes the following steps:
step (1): acquiring all zero crossing points in the single-ended fault record data by traversing all points with zero amplitude values in the fault record data;
step (2): calculating the effective value of each section of signal and the sum of squares of slopes of all points in each section of signal based on the signals with set length taking each zero crossing point as a starting point;
specifically, in this embodiment, signals of half power frequency period length with each zero crossing point as a starting point are first obtained to form a multi-segment signal;
then calculating the effective value of each section of signal, specifically:
；
wherein ,Nthe number of sampling points in the nth section of signal;for samplingPoint(s)kA current value at; />Is the effective value of the nth segment signal.
Calculating the slope square sum of all points in each section of signal, specifically:
wherein ,is the sum of the squares of the slopes of all points in the nth segment signal,>is the sampling pointkThe value of the current at which the current is measured,is the sampling pointk+A current value at 1.
Step (3): making a difference between the effective value of each section of signal and the effective value of the first section of signal, and marking the difference as the effective value difference of each section; making a difference between the sum of squares of the slopes of all points of each section of signal and the sum of squares of the slopes of all points of the first section of signal, and recording the sum of squares of the slopes of each section of signal as a sum difference;
wherein, the first section signal is: and taking the first zero crossing point in the wave recording signal as a starting point to obtain a half power frequency period length signal.
Specifically, the firstThe effective value difference calculation formula of the segment signals is as follows: />；
First, theThe calculation formula of the segment signal slope square sum difference is as follows: />；
wherein ,I 1 andK 1 the effective value of the first segment signal and the sum of the squares of the slopes of all points, respectively.
Step (4): if the effective value difference of two continuous sections is larger than the set first coefficient, recording the zero crossing point corresponding to the effective value difference of the previous section as a; if the square sum difference of two continuous sections of slopes is larger than a set second coefficient, recording the zero crossing point corresponding to the square sum difference of the previous section of slopes as b;
in the present embodiment, first coefficients for making a significant value difference determination are set respectivelyAnd a second coefficient for making a slope squared sum and difference determination +.>。
As a specific example, the range of values of the first coefficient is:；
the range of the second coefficient is as follows:。
the effective value difference is greater than the first coefficient twice in successionRecording a zero crossing point corresponding to the effective value difference of the previous section in two times as a point a; namely:
wherein ,is->Effective value difference of segment signal, +.>Is->Effective value difference of +1 signal, +.>Is the effective value of the nth segment signal, < >>Is the effective value of the n +1 segment signal,I 1 is the effective value of the first segment signal.
When the sum of squares difference of the slopes is greater than the second coefficientRecording a zero crossing point corresponding to the square sum difference of the slope of the previous section in two times as a point b; namely:
wherein ,first->Segment signal slope sum-of-squares difference, < >>First->+1 segment signal slope sum-of-squares difference, +.>Is the sum of the squares of the slopes of all points in the nth segment signal,>the sum of squares of the slopes of all points in the n+1 signal;K 1 the sum of squares of the slopes of all points of the first segment signal, respectively.
Step (5): if a and b are the same zero crossing point, the end signal takes the zero crossing point as the first zero crossing point; otherwise, the first coefficient and/or the second coefficient are modified until a and b are satisfied as the same zero crossing point.
In this embodiment, comparing whether a and b are the same zero crossing point; and if the zero crossing points are the same, the double-end signals respectively carry out data synchronization by taking the zero crossing points searched by the double-end signals as synchronization references.
If the zero crossing points are not the same, the first coefficient is describedThe method is characterized in that the method is excessively large in selection and insensitive to amplitude change when faults occur, and the first coefficient and/or the second coefficient are modified at the moment, and the specific process is as follows:
(1) reducing the value of the first coefficient, and judging whether the first coefficient is larger than zero or not; if yes, entering (2); otherwise, entering (3);
(2) searching a zero crossing point a again based on the modified first coefficient, and if new a and b are the same zero crossing point, determining the zero crossing point as the first zero crossing point; if not, returning to (1);
(3) if the first coefficient is smaller than or equal to zero, a and b cannot be satisfied as the same zero crossing point; the description is the second coefficientIrrational selection due to ∈>Small enough, record the first coefficient of last modification +.>Zero crossing point a obtained by (the value is larger than zero and is closest to zero);
at this time, the second coefficient is reduced, the zero crossing point b is found again based on the modified second coefficient, and the new b and the first coefficient modified last time are judgedWhether the obtained zero crossing points a are the same zero crossing points or not; if yes, then theThe zero crossing point is the first zero crossing point; if not, continuing to reduce the second coefficient until a and b are the same zero crossing point.
Step (6): based on fault recording data of each end, obtaining a first zero crossing point of the end; and the double-end signals respectively use the first zero crossing points obtained by the double-end signals as synchronous references to carry out data synchronization, so that the accuracy of data synchronization is improved.
As a specific example, fig. 2 is load side fault current recording data when a two-phase short-circuit fault occurs in a 10kV power transmission line; the signal has 12 zero crossings, which are respectively marked as a point 1 and a point 2 and a point … from left to right, and the first zero crossing point before the fault is a point 8 because the fault is judged to occur in the interval of a point 8 and a point 9 through analysis.
The first double arrow from left to right in fig. 2 refers to the signal of half the power frequency cycle length from point 1, the second double arrow refers to the signal of half the power frequency cycle length from point 2, and so on, the third double arrow refers to the signal of half the power frequency cycle length from point 8, and the fourth double arrow refers to the signal of half the power frequency cycle length from point 9.
The effective values of the half power frequency period length signals (respectively recorded as the 1 st section and the 2 nd section … th section signals) and the square sum of the slopes of the points with the point 1 and the point 2 … point 11 as the starting points are respectively shown in fig. 3 and fig. 4.
As can be seen from fig. 3 and 4, the effective value of the 8 th segment signal and the sum of squares of the slopes of the points start to change.
The calculated effective value difference and the slope sum-square difference of each segment are shown in fig. 5 and 6. As shown in FIG. 5, when the first coefficient is selected based on the effective value difference criterionWhen (I)>And->The zero crossing 9 is noted as point a.
As shown in FIG. 6, according to the slopeThe square sum and difference criterion is selected when the second coefficient is selectedWhen (I)>And is also provided withThe zero-crossing point 8 is noted as point b.
Due to less change in effective value of the 8 th-stage signalThe effective value difference criterion is insensitive to signal amplitude change, so that the first zero crossing point a before the fault obtained by the effective value difference criterion is a point 9, and the point 8 obtained by the slope square sum difference criterion is compared with the point 8, and the zero crossing point is not the same zero crossing point, and the zero crossing point is reduced>Re-selecting point a, when->Reduced to +.>When the effective value difference criterion is used for selecting the point 8 as the point a, and the point 8 obtained by the slope square sum difference criterion is compared at the moment, so that the point 8 can be identified as the first zero crossing point before the fault to be found, namely the first zero crossing point before the fault shown in fig. 2.
The method of the embodiment can directly and accurately find the first zero crossing point, can effectively avoid some invalid zero crossing points caused by amplitude change and signal high-frequency oscillation after the fault occurs, and improves the self-synchronizing success rate of zero crossing point data.
Example two
In one or more embodiments, a double-ended fault recording data synchronization system based on first zero crossing identification is disclosed, comprising:
the data acquisition module is used for acquiring all zero crossing points in the single-ended fault wave recording data; calculating the effective value of each section of signal and the sum of squares of slopes of all points in each section of signal based on the signals with set length taking each zero crossing point as a starting point;
the data calculation module is used for making a difference between the effective value of each section of signal and the effective value of the first section of signal and recording the difference as the effective value difference of each section of signal; making a difference between the sum of squares of the slopes of all points of each section of signal and the sum of squares of the slopes of all points of the first section of signal, and recording the sum of squares of the slopes of each section of signal as a sum difference;
the first zero-crossing judging module is used for recording that the zero-crossing corresponding to the previous section of effective value difference is a when the two sections of continuous effective value differences are larger than the set first coefficient; when the square sum difference of two continuous sections of slopes is larger than a set second coefficient, recording the zero crossing point corresponding to the square sum difference of the previous section of slopes as b; if a and b are the same zero crossing point, the end signal takes the zero crossing point as the first zero crossing point; otherwise, the first coefficient and/or the second coefficient are modified until a and b are satisfied as the same zero crossing point.
And the data synchronization module is used for carrying out data synchronization by taking the first zero crossing points obtained by the two-end signals respectively as synchronization references.
The specific implementation manner of each module is the same as that in the first embodiment, and will not be described in detail.
While the foregoing description of the embodiments of the present application has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the application, but rather, it is intended to cover all modifications or variations within the scope of the application as defined by the claims of the present application.
Claims (8)
1. The double-end fault recording data synchronization method based on the first zero crossing point identification is characterized by comprising the following steps of:
acquiring all zero crossing points in the single-ended fault record data; calculating the effective value of each section of signal and the sum of squares of slopes of all points in each section of signal based on the signals with set length taking each zero crossing point as a starting point;
making a difference between the effective value of each section of signal and the effective value of the first section of signal, and marking the difference as the effective value difference of each section; making a difference between the sum of squares of the slopes of all points of each section of signal and the sum of squares of the slopes of all points of the first section of signal, and recording the sum of squares of the slopes of each section of signal as a sum difference;
if the effective value difference of two continuous sections is larger than the set first coefficient, recording the zero crossing point corresponding to the effective value difference of the previous section as a; if the square sum difference of two continuous sections of slopes is larger than a set second coefficient, recording the zero crossing point corresponding to the square sum difference of the previous section of slopes as b;
if a and b are the same zero crossing point, the single-ended signal takes the zero crossing point as the first zero crossing point; otherwise, modifying the first coefficient and/or the second coefficient until a and b are the same zero crossing point;
and the double-end signals respectively take the first zero crossing points obtained by the double-end signals as synchronous references to carry out data synchronization.
2. The method for synchronizing double-end fault recording data based on first zero crossing point identification as set forth in claim 1, wherein the first coefficient and/or the second coefficient is modified until a and b are satisfied as the same zero crossing point, and the specific process is as follows:
(1) reducing the value of the first coefficient, and judging whether the first coefficient is larger than zero or not; if yes, entering (2); otherwise, entering (3);
(2) searching a zero crossing point a again based on the modified first coefficient, and if new a and b are the same zero crossing point, determining the zero crossing point as the first zero crossing point; if not, returning to (1);
(3) reducing the second coefficient, searching for a zero crossing point b again based on the modified second coefficient, and judging whether the new zero crossing point b and the zero crossing point a found by the first coefficient modified last time are the same zero crossing point; if yes, the zero crossing point is the first zero crossing point; if not, repeating the step (3) until the condition that a and b are the same zero crossing point is met.
3. The method for synchronizing double-ended fault recording data based on first zero crossing point identification as set forth in claim 1, wherein the effective value of each segment of signal is calculated, specifically:
wherein ,Nthe number of sampling points in the nth section of signal;is the sampling pointkA current value at; />Is the effective value of the nth segment signal.
4. The method for synchronizing double-end fault recording data based on first zero crossing point identification as set forth in claim 1, wherein the calculating of the sum of squares of slopes of all points in each segment of signal is specifically as follows:
wherein ,is the sum of the squares of the slopes of all points in the nth segment signal,>is the sampling pointkCurrent value at>Is the sampling pointk+A current value at 1.
5. The method for synchronizing double-ended fault recording data based on first zero crossing point identification of claim 1,
the range of the first coefficient is as follows:；
the range of the second coefficient is as follows:；
wherein ,I1 and K1 is the effective value of the first segment signal and the sum of squares of the slopes of all points,In and Kn is the effective value of the nth segment signal and the sum of the squares of the slopes of all points, respectively.
6. The method for synchronizing double-end fault recording data based on first zero crossing point identification as claimed in claim 1, wherein the first zero crossing point of each end is obtained based on the fault recording data of the end; and the double-end signals respectively take the first zero crossing points obtained by the double-end signals as synchronous references to carry out data synchronization.
7. The method for synchronizing double-ended fault recording data based on first zero crossing point identification as claimed in claim 1, wherein the signal with a set length starting from each zero crossing point is specifically:
and a signal of half power frequency period length taking each zero crossing point as a starting point.
8. A double-ended fault recording data synchronization system based on first zero crossing point identification, comprising:
the data acquisition module is used for acquiring all zero crossing points in the single-ended fault wave recording data; calculating the effective value of each section of signal and the sum of squares of slopes of all points in each section of signal based on the signals with set length taking each zero crossing point as a starting point;
the data calculation module is used for making a difference between the effective value of each section of signal and the effective value of the first section of signal and recording the difference as the effective value difference of each section of signal; making a difference between the sum of squares of the slopes of all points of each section of signal and the sum of squares of the slopes of all points of the first section of signal, and recording the sum of squares of the slopes of each section of signal as a sum difference;
the first zero-crossing judging module is used for recording that the zero-crossing corresponding to the previous section of effective value difference is a when the two sections of continuous effective value differences are larger than the set first coefficient; when the square sum difference of two continuous sections of slopes is larger than a set second coefficient, recording the zero crossing point corresponding to the square sum difference of the previous section of slopes as b; if a and b are the same zero crossing point, the single-ended signal takes the zero crossing point as the first zero crossing point; otherwise, modifying the first coefficient and/or the second coefficient until a and b are the same zero crossing point;
and the data synchronization module is used for carrying out data synchronization by taking the first zero crossing points obtained by the two-end signals respectively as synchronization references.
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