CN110095743B - Distribution network terminal wave recording performance test module and waveform fitting method thereof - Google Patents
Distribution network terminal wave recording performance test module and waveform fitting method thereof Download PDFInfo
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- CN110095743B CN110095743B CN201910296785.4A CN201910296785A CN110095743B CN 110095743 B CN110095743 B CN 110095743B CN 201910296785 A CN201910296785 A CN 201910296785A CN 110095743 B CN110095743 B CN 110095743B
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000011056 performance test Methods 0.000 title claims abstract description 19
- 238000012795 verification Methods 0.000 claims description 27
- 238000005259 measurement Methods 0.000 claims description 10
- 238000005070 sampling Methods 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 4
- 230000001052 transient effect Effects 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
- G01R35/007—Standards or reference devices, e.g. voltage or resistance standards, "golden references"
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Abstract
The invention belongs to the technical field of distribution network terminal detection, and particularly relates to a distribution network terminal wave recording performance test module and a waveform fitting method thereof. The wave recording performance of the distribution terminal is required to be detected in the post-arrival detection outline of the distribution automation terminal in 2017 of the national grid company. The steady-state recording voltage basic error is required: 0.05Un < = 5%,0.1Un < = 2.5%,0.5Un < = 1%,1.0Un < = 5%,1.5Un < = 1%; steady state current relative error is required: 0.1In < = 5%,0.2In < = 2.5%,0.5In < = 1%,1.0In < = 5%,5.0In < = 1,10In < = 2.5%; it is required that the maximum peak instantaneous error in the transient recording should be no more than 10%.
Description
Technical Field
The invention belongs to the technical field of distribution network terminal detection, and particularly relates to a distribution network terminal wave recording performance test module and a waveform fitting method thereof.
Background
The wave recording performance of the distribution terminal is required to be detected in the post-arrival detection outline of the distribution automation terminal in 2017 of the national grid company. The steady-state recording voltage basic error is required: 0.05Un < = 5%,0.1Un < = 2.5%,0.5Un < = 1%,1.0Un < = 5%,1.5Un < = 1%; steady state current relative error is required: 0.1In < = 5%,0.2In < = 2.5%,0.5In < = 1%,1.0In < = 5%,5.0In < = 1,10In < = 2.5%; it is required that the maximum peak instantaneous error in the transient recording should be no more than 10%.
In the conventional recording performance test, the standard waveform and the measured waveform have inconsistent waveform sampling rates, and the waveform starting points of 2 waveforms are different when the waveforms are compared. If the sampling rates of the 2 waveforms are different, the waveforms with less sampling rates need to be subjected to interpolation by applying a Lagrange interpolation algorithm, so that the waveforms are consistent with the sampling rates of the other waveforms. If the steady-state waveforms are compared, waveform discrete points which are not in the same stage are taken for calculating an effective value of root mean square calculation, so that the calculated effective value has larger deviation; if transient waveforms are compared, 2 waveforms are needed to obtain the maximum peak value at the same stage to calculate the transient error, otherwise, the calculated transient error has no meaning. In order to ensure that the discrete points of the standard waveform and the measured waveform are taken at the same stage, 2 waveforms need to be fitted, and errors are calculated after the fitting, so that the calculated errors can accurately judge the wave recording performance of the distribution network terminal.
Disclosure of Invention
In order to overcome the defects, the invention provides a method for fitting the standard waveform of the standard source and the measurement waveform of the distribution network terminal, and the obtained error can more accurately judge the distribution network wave recording performance. A wave recording performance test module of a distribution network terminal and a waveform fitting method thereof. The specific technical content is as follows:
the distribution network terminal wave recording performance test module comprises a distribution network terminal verification standard source, a distribution network terminal and distribution network terminal verification system software; the distribution network terminal is connected with the standard source through a voltage test wire and a current test wire; the distribution network terminal is connected with the distribution network terminal verification system software; the distribution network terminal verification system software is connected with a distribution network terminal verification standard source, and the distribution network terminal verification system software obtains a distribution network terminal verification standard source standard waveform and a measurement waveform of the distribution terminal.
Further, the distribution network terminal is connected with the distribution network terminal verification system software through an RJ45 network port line.
Further, the distribution network terminal verification system software is connected with a distribution network terminal verification standard source through an RS232 serial port line.
A waveform fitting method for a distribution network terminal wave recording performance test is characterized by comprising the following steps of: the method comprises the following steps:
s1, analyzing a standard waveform and a measured waveform, and taking a standard waveform discrete point A 0 ,A 1 ,A 2 ,...,A N The method comprises the steps of carrying out a first treatment on the surface of the Taking discrete point B of measurement waveform 0 ,B 1 ,B 2 ,...,B N 。
S2, inserting discrete points by using a Bragg-Rich interpolation algorithm to the discrete points of the extracted measurement waveform, so that the discrete points are consistent with the standard waveform sampling rate, and forming new discrete points M 0 ,M 1 ,M 2 ,...,M N ；
S3, designating inflection point region discrete points (namely discrete points to be matched) A of standard waveform t ,A t+1 ,...,A t+100 ；
S4, performing fitting calculation by using the matched discrete points to form new discrete points,
C 0 ＝M 0 *A t +M 1 *A t+1 +...+M 100 *A t+100 ；
C 1 ＝M 1 *A t +M 2 *A t+1 +...+M 101 *A t+100 ；
....
C 100 ＝M 100 *A t +M 101 *A t+1 +...+M 200 *A t+100 ；
then M Y Namely sum A t Corresponding point, changing the time of the discrete point of the waveform A to enable the waveform A to be t And M Y The two discrete point moments are consistent, and the A discrete point waveform deduced from the two discrete point moments is fitted with the M discrete point waveform.
After the A discrete point and the M discrete point are fitted, the A discrete point waveform and the B discrete point waveform naturally form fitting
Further, the step S1 is that the source continuous output quantity enables the standard source and the power distribution terminal to generate a wave recording file.
The invention has the beneficial effects that: a waveform fitting algorithm for a distribution network wave recording performance test is provided, wherein a standard waveform of a standard source and a measured waveform of a distribution network terminal are fitted first, then errors of the standard waveform and the measured waveform are calculated, and the obtained errors can be used for accurately judging the transient wave recording performance and the steady wave recording performance of the distribution network terminal.
Drawings
Fig. 1 is a schematic structural diagram of a distribution network terminal wave recording performance test module according to the present invention;
fig. 2 is a waveform effect diagram of a waveform fitting method of a distribution network terminal wave recording performance test according to the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, a distribution network terminal wave recording performance test module includes a distribution network terminal verification standard source, a distribution network terminal, and distribution network terminal verification system software; the distribution network terminal is connected with the standard source through a voltage test wire and a current test wire; the distribution network terminal is connected with the verification system software of the distribution network terminal through an RJ45 network port line; the distribution network terminal verification system software is connected with a distribution network terminal verification standard source through an RS232 serial port line, and the distribution network terminal verification system software obtains a distribution network terminal verification standard source standard waveform and a measurement waveform of a distribution terminal.
A waveform fitting method for a distribution network terminal wave recording performance test is characterized by comprising the following steps of: the method comprises the following steps:
s1, analyzing a standard waveform and a measured waveform, wherein a source continuous output quantity enables a standard source and a power distribution terminal to generate a wave recording file; taking standard waveform discrete point A 0 ,A 1 ,A 2 ,...,A N The method comprises the steps of carrying out a first treatment on the surface of the Taking discrete point B of measurement waveform 0 ,B 1 ,B 2 ,...,B N ；
S2, inserting discrete points by using a Bragg-Rich interpolation algorithm to the discrete points of the extracted measurement waveform, so that the discrete points are consistent with the standard waveform sampling rate, and forming new discrete points M 0 ,M 1 ,M 2 ,...,M N ；
S3, designating inflection point region discrete points of the standard waveform, namely discrete points to be matched, A t ,A t+1 ,...,A t+100 ；
S4, performing fitting calculation by using the matched discrete points to form new discrete points,
C 0 ＝M 0 *A t +M 1 *A t+1 +...+M 100 *A t+100 ；
C 1 ＝M 1 *A t +M 2 *A t+1 +...+M 101 *A t+100 ；
....
C 100 ＝M 100 *A t +M 101 *A t+1 +...+M 200 *A t+100 ；
then M Y Namely sum A t Corresponding point, changing the time of the discrete point of the waveform A to enable the waveform A to be t And M Y The two discrete point moments are consistent, and the A discrete point waveform deduced from the two discrete point moments is fitted with the M discrete point waveform.
As shown in FIG. 2, the A discrete point waveform and the B discrete point waveform are naturally formed after being fitted
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. The waveform fitting method of the distribution network terminal wave recording performance test adopts a distribution network terminal wave recording performance test module, wherein the distribution network terminal wave recording performance test module comprises a distribution network terminal verification standard source, a distribution network terminal and distribution network terminal verification system software; the distribution network terminal is connected with the standard source through a voltage test wire and a current test wire; the distribution network terminal is connected with the distribution network terminal verification system software; the distribution network terminal verification system software is connected with a distribution network terminal verification standard source, and the distribution network terminal verification system software obtains a distribution network terminal verification standard source standard waveform and a measurement waveform of a distribution terminal;
the method is characterized in that: the method comprises the following steps:
s1, analyzing a standard waveform and a measured waveform, and taking a standard waveform discrete point A 0 ,A 1 ,A 2 ,...,A N The method comprises the steps of carrying out a first treatment on the surface of the Taking discrete point B of measurement waveform 0 ,B 1 ,B 2 ,...,B N ；
S2, inserting discrete points of the extracted measurement waveform by using a Bragg-Rich interpolation algorithm to make the discrete points consistent with the standard waveform sampling rate, thereby deducing and forming new discrete points M 0 ,M 1 ,M 2 ,...,M N ；
S3, designating inflection point region discrete points of the standard waveform, wherein the inflection point region discrete points are discrete points A to be matched t ,A t+1 ,...,A t+100 ；
S4, performing fitting calculation by using the matched discrete points to form new discrete points,
C 0 ＝M 0 *A t +M 1 *A t+1 +...+M 100 *A t+100 ；
C 1 ＝M 1 *A t +M 2 *A t+1 +...+M 101 *A t+100 ；
....
C 100 ＝M 100 *A t +M 101 *A t+1 +...+M 200 *A t+100 ；
ordered discrete point C 0 ,...,C 100 Number Y of maximum value of A t And M Y The two discrete points coincide in time.
2. The waveform fitting method for a distribution network terminal wave recording performance test according to claim 1, wherein the step S1 source continuous output quantity enables both a standard source and a distribution terminal to generate wave recording files.
3. The waveform fitting method for a distribution network terminal wave recording performance test according to claim 2, wherein the distribution network terminal is connected with distribution network terminal verification system software through an RJ45 network port line.
4. A waveform fitting method for a distribution network terminal wave recording performance test as set forth in claim 3, wherein the distribution network terminal verification system software is connected with a distribution network terminal verification standard source through an RS232 serial port line.
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