CN111679151B - Synchronous alignment point vector calculation method for double-end distance measurement of wave recording data - Google Patents
Synchronous alignment point vector calculation method for double-end distance measurement of wave recording data Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
Abstract
The invention provides a synchronous alignment point vector calculation method for double-end distance measurement of wave recording data, which solves the problem that double-end distance measurement cannot be completed due to vector information loss of synchronous alignment points caused by the fact that a sampling point on one side is not coincident with a sampling point on the opposite side at the same time when the sampling rates of double-end wave recording data are not consistent. The method has the advantages that the calculation vector is not affected by inconsistent sampling rates of the wave recording data, the synchronous alignment points are not required to be adjusted repeatedly, interpolation or resampling is not required to modify the original wave recording data, only one side sampling point is required to be determined, and the vector of the synchronous alignment points can be calculated according to the method recorded by the invention to complete double-end distance measurement no matter the side same-time sampling points fall on any sampling point of the side wave recording data or the gaps of the sampling points, and a new synchronous alignment point is not required to be searched repeatedly.
Description
Technical Field
The invention relates to the field of fault recording double-end distance measurement of a power system, in particular to a synchronous alignment point vector calculation method for recording data double-end distance measurement.
Background
The power transmission line is a main carrier for constructing a power grid in China, has the characteristics of wide node distribution and dense line corridors, and is beneficial to timely searching fault points and quickly repairing by carrying out double-end positioning calculation on recording data provided by substations on two sides of the line to carry out accurate fault location, so that the working efficiency of power workers is improved, and the power supply reliability and the social and civil safety are guaranteed.
The double-end ranging principle based on wave recording data is as follows: as shown in figure 1, when any kind of short-circuit fault occurs at k points, the fault phase voltage measured by M-side protection is recorded
Fault phase current
Zero sequence component of fault phase current
And N-side protection of the measured faulted phase voltage
Fault phase current
Zero sequence component of fault phase current
And finding accurate synchronous alignment points on two sides based on the wave recording data, substituting various vectors of the synchronous alignment points into a double-end distance measurement formula to solve an equation, and further obtaining the position of a fault point. The vectors used in the double-end distance measurement formula are extracted from sine waves, but the sine waves cannot provide accurate vectors, for example, the sampling rates of two sides of the power transmission line are different, the fact that each sampling point has a ready-made corresponding vector cannot be guaranteed, and double-end distance measurement is also lackedThe key required vector information needs to be processed at this time, the synchronous alignment point can be adjusted continuously in the prior art, and the method has low efficiency and high risk when the adjustment is performed once in each calculation; if not wanting to calculate the adjustment each time, need use interpolation, digital signal processing (fitting), resampling method to guarantee that the sampling rate is unanimous, but this kind of method has changed the original record data, leads to the result credibility to reduce. If the vector of the synchronous alignment point is calculated by a median method, only approximate calculation is carried out, and the accuracy is still low. Therefore, in order to solve the above problems, the present invention provides a method for calculating a vector of a synchronous alignment point for double-end ranging of recorded data, which can quickly calculate the vector of the synchronous alignment point without changing the original recorded data.
Disclosure of Invention
In view of this, the present invention provides a method for calculating a vector of a synchronous alignment point for double-end ranging of recorded data, which can quickly calculate a vector of a synchronous alignment point without changing original recorded data. The method is not influenced by the sampling rate difference of the recording data, does not need to repeatedly adjust the synchronous alignment point, and avoids the problem that the original recording data is changed by interpolation, digital signal processing (fitting) and resampling.
The technical scheme of the invention comprises the following steps:
s1, finding the first synchronous alignment points of the M-side recording data and the N-side recording data by adopting a two-side recording data synchronous alignment method;
s2, setting the number of sampling points of each period of the M-side and N-side recording data as M and N respectively, wherein the sampling points of the M side are reference sampling points after the first synchronous alignment, and the sampling points of the N side and the reference sampling points at the same time are simultaneous sampling points;
s3, when the simultaneous sampling points exist on the N side, directly determining synchronous alignment points, and extracting vectors of the M side reference sampling points and the N side simultaneous sampling points to perform double-end ranging; when the N side does not have simultaneous sampling points, performing steps S4-S7;
s4, calculating a fixed phase angle difference value delta theta of adjacent sampling points on each cycle according to the N-side sampling rate, dividing each cycle into N sampling intervals with fixed intervals, and recording the corresponding time range of each sampling interval;
s5, recording the vector of the M-side reference sampling point as (T1, theta 1), and recording the sampling time as T1Let t be1Comparing the time range corresponding to the sampling interval of the N side to obtain the sampling interval (t) of the sampling point of the N side at the same timei,ti+1) And section end point ti、ti+1Vectors corresponding to the N-side simultaneous sampling points are respectively marked as (T2, theta 2), (T3, theta 3), and the sampling interval (T)i,ti+1) The interval of (d) is set to Δ X;
s6, calculating the distance between the N-side synchronous alignment points on the time axis t and the interval endpoint tiAnd the ratio of L to the interval distance DeltaX
S7, setting the vector of the N-side synchronous alignment point as (T4, theta 4), wherein the amplitude calculation formula of the synchronous alignment point is as follows:
the phase angle calculation formula is as follows:
in addition to the above technical means, it is further preferable that Δ X ═ t in S4i+1-ti|。
In addition to the above technical means, it is further preferable that L ═ t in S51-ti|。
Compared with the prior art, the synchronous alignment point vector calculation method for recording data double-end distance measurement has the following beneficial effects:
(1) after the first synchronous alignment point is confirmed, even if a certain side does not have a simultaneous time sampling point, a more accurate vector of the synchronous alignment point can be obtained through calculation, the problem that double-end distance measurement cannot be completed due to vector information loss of the synchronous alignment point caused by the fact that the sampling point of the certain side is not coincident with the sampling point of the opposite side at the same time when the sampling rates of double-end recording data are not consistent is solved, and the workload and the time for repeatedly adjusting the synchronous alignment point are saved;
(2) the method has good compatibility, is not influenced by inconsistent sampling method rates of the wave recording data, does not need to repeatedly adjust synchronous alignment points, does not need interpolation or resampling to modify the original sampling data, only needs one side sampling point to determine, and can calculate the vector of the synchronous alignment points according to the method recorded by the invention to finish double-end distance measurement without repeatedly searching for new synchronous alignment points no matter whether the side same-time sampling points fall on any sampling points of the side wave recording data or the gaps of the sampling points;
(3) the problems that the original recording data are changed and the reliability of the result is reduced by a traditional interpolation method or resampling are solved, and the vector of the synchronous alignment point is calculated on the basis of not changing the original sampling data to finish double-end ranging.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a double-ended ranging principle based on recording data;
fig. 2 is a schematic diagram of a synchronous alignment point vector calculation method for double-end distance measurement of recording data according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments of the present invention, belong to the protection scope of the present invention. The method comprises the following specific steps:
the invention discloses a synchronous alignment point vector calculation method for double-end ranging of recorded wave data, which comprises the following steps of:
s1, finding the first synchronous alignment points of the M-side recording data and the N-side recording data by adopting a two-side recording data synchronous alignment method;
as shown in fig. 2, a and a 'are synchronous alignment points of the in-phase sampling instantaneous value curve, where a is an M-side reference sampling point, a' is an N-side simultaneous sampling point, both points are real sampling points, and at this time, a vector of the synchronous alignment point can be directly taken to perform double-end ranging.
In this embodiment, how to find the synchronous alignment point on the sampled instantaneous value curve is not described again, and the related steps can be found according to the existing literature.
S2, setting the number of sampling points of each period of the M-side and N-side recording data as M and N respectively, wherein the sampling points of the M side are reference sampling points after the first synchronous alignment, and the sampling points of the N side and the reference sampling points at the same time are simultaneous sampling points;
s3, when the N side has a simultaneous sampling point, if B in figure 2 is a reference sampling point of the M side, the sampling point is a real sampling point, at this moment, if the sampling point of the N side and the reference sampling point at the same moment exactly falls on B1 or B2, at this moment, two points of the M side and the N side are both real sampling points, and at this moment, the vector of the synchronous alignment point can be directly taken for double-end ranging.
When there is no simultaneous sampling point on the N side, as shown in fig. 2, B and B' are synchronous alignment points of the in-phase sampling instantaneous value curve, where B is a reference sampling point on the M side, which is a real sampling point, and a vector can be directly obtained. However, the sampling point B 'corresponding to the N-side synchronous alignment point does not necessarily exist actually, and as the N-side synchronous alignment point B' in fig. 2 falls between two adjacent real sampling points, the vector cannot be directly obtained.
As shown in fig. 2, the single-phase sampling instantaneous value curves at the two ends of M and N are any point on the single-phase sampling instantaneous value curve at the side of M and are real sampling points; b' is a coincidence sampling point on the sampled instantaneous value curve in phase with the N-side. At this time, since B is a real sampling point that actually exists, the vector of B (T1, θ 1) can be directly obtained, and the main difficulty of the present embodiment is how to calculate the vector of B'. The traditional method is to change the original single-phase sampling instantaneous value curve of the N side by adopting methods such as interpolation, digital signal processing (fitting) or resampling and the like to obtain the vector of B', and the methods change the original single-phase sampling instantaneous value curve of the N side and have low reliability. The median method is fast to calculate, but the accuracy is still low compared with the calculation method of the invention. At this time, steps S4-S7 can be performed to obtain a vector of N-side synchronous alignment points.
S4, calculating a fixed phase angle difference Δ θ between adjacent sampling points on the cycle according to the sampling rate of the N side, where in this embodiment, the recording data of the sampling rate of 1000Hz is taken as an example, and 20 sampling points per cycle, that is, N is 20, the fixed phase angle difference is 18 °, that is, Δ θ is 18 °;
s5, recording the vector of the M-side reference sampling point as (T1, theta 1), and recording the sampling time as T1Will t1Comparing the time range corresponding to the sampling interval of the N side to obtain the sampling interval (t) of the sampling point of the N side at the same timei,ti+1) And interval end point ti、ti+1Vectors corresponding to the N-side synchronization alignment points are respectively marked as (T2, θ 2), (T3, θ 3), and a sampling interval (T)i,ti+1) The interval of (d) is set to Δ X.
Where i denotes the ith sample point, tiIndicating the sampling time corresponding to the ith sampling point.
It can be seen from fig. 2 that the N-side synchronization alignment point is located between two adjacent real sampling points. In the embodiment, the vectors (T2, θ 2) and (T3, θ 3) of two adjacent real sampling points are (3.48, 72 °) and (3.5, 90 °), respectively, and the sampling interval (T)i,ti+1) Is given as Δ X, Δ X ═ ti+1-ti|。
S6, calculating the distance interval endpoint t of the N-side synchronous alignment point on the time axis tiAnd the ratio of L to the interval distance DeltaX
In this example
S7, the vector of the N-side synchronous alignment point is (T4, theta 4)The amplitude calculation formula of the synchronous alignment point is as follows:
the phase angle calculation formula is as follows:
in the present embodiment, the first and second electrodes are,
the technical principle of the embodiment is as follows: when the recorded wave data on one side has no simultaneous sampling point, the following steps are carried out by calculating the known sampling rate at the synchronous alignment moment: and calculating the change rate of the vector in the sampling interval of the cycle unit by utilizing the vector information of the adjacent sampling point and the sampling interval difference between the selected adjacent sampling point and the synchronous alignment point to obtain the vector information of the synchronous alignment point.
The beneficial effect of this embodiment does: after the first synchronous alignment point is confirmed, even if a certain side does not have a simultaneous time sampling point, a more accurate vector of the synchronous alignment point can be obtained through calculation, the problem that double-end distance measurement cannot be completed due to the fact that vector information of the synchronous alignment point is lost because the synchronous alignment point on the certain side is not coincident with the sampling point when the sampling rates of double-end recording data are not consistent is solved, and the workload and the time for repeatedly adjusting the synchronous alignment point are saved;
the method has good compatibility, is not influenced by inconsistent sampling method rates of the wave recording data, does not need to repeatedly adjust synchronous alignment points, does not need interpolation or resampling to modify the original sampling data, only needs one side sampling point to determine, and can calculate the vector of the synchronous alignment points according to the method recorded by the invention to finish double-end distance measurement without repeatedly searching for new synchronous alignment points no matter whether the side same-time sampling points fall on any sampling points of the side wave recording data or the gaps of the sampling points;
the problems that the original recording data are changed and the reliability of the result is reduced by a traditional interpolation method or resampling are solved, and the vector of the synchronous alignment point is calculated on the basis of not changing the original sampling data to finish double-end ranging.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included therein.
Claims (3)
1. A synchronous alignment point vector calculation method for double-end ranging of recorded wave data is characterized by comprising the following steps: the method comprises the following steps:
s1, finding the first synchronous alignment points of the M-side recording data and the N-side recording data by adopting a two-side recording data synchronous alignment method;
s2, setting the number of sampling points of each period of the M-side and N-side recording data as M and N respectively, wherein the sampling points of the M side are reference sampling points after the first synchronous alignment, and the sampling points of the N side and the reference sampling points at the same time are simultaneous sampling points;
s3, when the simultaneous sampling points exist on the N side, directly determining synchronous alignment points, and extracting vectors of the M side reference sampling points and the N side simultaneous sampling points to perform double-end ranging; when the N side does not have simultaneous sampling points, performing steps S4-S7;
s4, calculating a fixed phase angle difference value delta theta of adjacent sampling points on each cycle according to the N-side sampling rate, dividing each cycle into N sampling intervals with fixed intervals, and recording the corresponding time range of each sampling interval;
s5, recording the vector of the M-side reference sampling point as (T1, theta 1), and recording the sampling time as T1Will t1Comparing the time range corresponding to the sampling interval of the N side to obtain the sampling interval (t) of the sampling point of the N side at the same timei,ti+1) And interval end point ti、ti+1Vectors corresponding to the N-side simultaneous sampling points are respectively marked as (T2, theta 2), (T3, theta 3), and the sampling interval (T)i,ti+1) The interval pitch of (c) is set to Δ X;
s6, calculating distance interval end point t of N side simultaneous sampling points on time axis tiAnd the ratio of L to the interval distance DeltaX
S7, setting the vector of the N-side synchronous alignment point as (T4, theta 4), wherein the amplitude calculation formula of the synchronous alignment point is as follows:
the phase angle calculation formula is as follows:
2. the method of claim 1, wherein the method comprises the steps of: Δ X ═ t in S4i+1-ti|。
3. The method of claim 1, wherein the method comprises the steps of: l ═ t in S51-ti|。
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