CN113325252A - Method for preventing crosstalk in network identification process of low-voltage distribution area ammeter - Google Patents
Method for preventing crosstalk in network identification process of low-voltage distribution area ammeter Download PDFInfo
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- CN113325252A CN113325252A CN202110526373.2A CN202110526373A CN113325252A CN 113325252 A CN113325252 A CN 113325252A CN 202110526373 A CN202110526373 A CN 202110526373A CN 113325252 A CN113325252 A CN 113325252A
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
Abstract
The invention discloses a method for preventing crosstalk in a network identification process of low-voltage distribution area electric meters, which comprises the following steps: step 1: injecting the measuring signal into live wire current and zero line current; step 2: extracting characteristic signals in live wire current and zero line current by using fast Fourier algorithm (FFT); and step 3: and comparing the amplitude of the characteristic signal in the zero line with the amplitude of the characteristic signal in the live line, if the ratio is greater than a threshold value, considering the signal to belong to the local area, and otherwise, considering the signal to be a crosstalk signal from other areas. The invention correctly identifies the characteristic signal of the local area aiming at the condition of mutual crosstalk when a plurality of areas carry out low-voltage topology identification, thereby effectively avoiding the problem of crosstalk and ensuring the identification accuracy.
Description
Technical Field
The invention relates to the technical field of distribution automation, in particular to a method for preventing crosstalk in a network identification process of low-voltage distribution area electric meters.
Background
The low-voltage topology identification scheme based on the micro-current is a scheme for identifying a topology structure in a low-voltage transformer area by injecting a characteristic current signal between zero and live wires and identifying the signal at other detection points. However, during the signal transmission process, the transmitted characteristic signal can flow into the medium-voltage side through the transformer and flow to other stations, i.e. crosstalk is generated to other stations. Therefore, when a plurality of cells perform the low voltage topology recognition operation at the same time, crosstalk may occur in signals of the respective cells, thereby disturbing the topology recognition operation of the respective cells.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the invention provides a method for preventing crosstalk in network identification of the electric meters in the low-voltage distribution area, which can avoid the crosstalk problem possibly caused when a plurality of areas simultaneously carry out low-voltage topology identification work.
The purpose of the invention can be realized by the following technical scheme:
a method for preventing crosstalk in low-voltage transformer area electric meter network identification comprises the following steps:
step 1: injecting the measuring signal into live wire current and zero line current;
step 2: extracting characteristic signals in live wire current and zero line current by using fast Fourier algorithm (FFT);
and step 3: and comparing the amplitude of the characteristic signal in the zero line with the amplitude of the characteristic signal in the live line, if the ratio is greater than a threshold value, considering the signal to belong to the local area, and otherwise, considering the signal to be a crosstalk signal from other areas.
Further, the value range of the threshold in the step 3 is 0.2-1.
The invention has the beneficial technical effects that: the characteristic signals of the local area are correctly identified aiming at the condition of mutual crosstalk when a plurality of areas carry out low-voltage topology identification, so that the problem of crosstalk is effectively avoided, and the identification accuracy is ensured.
Drawings
FIG. 1 is a general flow diagram of the present invention.
FIG. 2 is a diagram of the relationship of two zones in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
With reference to fig. 1, a method for preventing crosstalk in a network identification process of low-voltage distribution area electric meters includes the following steps:
step 1: as shown in fig. 2, when two areas perform low-voltage topology identification simultaneously, the characteristic signal source sends characteristic signals in each area respectively and measures live line current and zero line current in each area by using CT;
step 2: for the station area 1, extracting characteristic signals in zero line current and live line current by using a Fast Fourier Transform (FFT), wherein the amplitudes of the characteristic signals are 0.17A and 0.15A respectively;
and step 3: comparing the amplitude of the characteristic signal in the zero line with the amplitude of the signal in the live line, wherein the ratio is 1.13 and is greater than the threshold (the threshold is defined as 1 in the embodiment), and regarding the characteristic signal as the characteristic signal sent by the device in the local area.
The above-mentioned embodiments are illustrative of the specific embodiments of the present invention, and are not restrictive, and those skilled in the relevant art can make various changes and modifications to obtain corresponding equivalent technical solutions without departing from the spirit and scope of the present invention, so that all equivalent technical solutions should be included in the scope of the present invention.
Claims (2)
1. A method for preventing crosstalk in a low-voltage transformer area electric meter network identification process is characterized by comprising the following steps:
step 1: injecting the measuring signal into live wire current and zero line current;
step 2: extracting characteristic signals in live wire current and zero line current by using fast Fourier algorithm (FFT);
and step 3: and comparing the amplitude of the characteristic signal in the zero line with the amplitude of the characteristic signal in the live line, if the ratio is greater than a threshold value, considering the signal to belong to the local area, and otherwise, considering the signal to be a crosstalk signal from other areas.
2. The method for preventing crosstalk in network identification of the low-voltage transformer area electric meters according to claim 1, wherein the value of the threshold in the step 3 is in a range of 0.2-1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110526373.2A CN113325252A (en) | 2021-05-14 | 2021-05-14 | Method for preventing crosstalk in network identification process of low-voltage distribution area ammeter |
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| CN202110526373.2A CN113325252A (en) | 2021-05-14 | 2021-05-14 | Method for preventing crosstalk in network identification process of low-voltage distribution area ammeter |
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| CN113325252A true CN113325252A (en) | 2021-08-31 |
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| CN202110526373.2A Withdrawn CN113325252A (en) | 2021-05-14 | 2021-05-14 | Method for preventing crosstalk in network identification process of low-voltage distribution area ammeter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114142464A (en) * | 2021-11-26 | 2022-03-04 | 深圳市锐能微科技有限公司 | Low-voltage transformer area topology identification method and device based on characteristic current signal detection |
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| CN207248962U (en) * | 2017-06-27 | 2018-04-17 | 北京新源绿网节能科技有限公司 | Low-voltage platform area data analyzer |
| CN109683064A (en) * | 2019-03-05 | 2019-04-26 | 深圳供电局有限公司 | The area distribution network Duo Tai online recognition system and method |
| CN110120668A (en) * | 2019-05-08 | 2019-08-13 | 许昌许继软件技术有限公司 | A kind of area's topology automatic identification method and system |
| CN110646690A (en) * | 2019-09-10 | 2020-01-03 | 国网浙江省电力有限公司电力科学研究院 | Method and system for identifying user variation relationship based on characteristic current signal |
| CN110716097A (en) * | 2019-10-11 | 2020-01-21 | 中电华瑞技术有限公司 | Power supply network topology identification method and device |
| CN111030097A (en) * | 2019-12-11 | 2020-04-17 | 江苏方天电力技术有限公司 | Low-voltage distribution network platform area topology identification method and system |
| CN111463779A (en) * | 2020-04-23 | 2020-07-28 | 威胜信息技术股份有限公司 | Power distribution station topology identification system and method |
| US20210132124A1 (en) * | 2019-11-01 | 2021-05-06 | Landis+Gyr Innovations, Inc. | Crosstalk cancelation for electricity metering |
-
2021
- 2021-05-14 CN CN202110526373.2A patent/CN113325252A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207248962U (en) * | 2017-06-27 | 2018-04-17 | 北京新源绿网节能科技有限公司 | Low-voltage platform area data analyzer |
| CN109683064A (en) * | 2019-03-05 | 2019-04-26 | 深圳供电局有限公司 | The area distribution network Duo Tai online recognition system and method |
| CN110120668A (en) * | 2019-05-08 | 2019-08-13 | 许昌许继软件技术有限公司 | A kind of area's topology automatic identification method and system |
| CN110646690A (en) * | 2019-09-10 | 2020-01-03 | 国网浙江省电力有限公司电力科学研究院 | Method and system for identifying user variation relationship based on characteristic current signal |
| CN110716097A (en) * | 2019-10-11 | 2020-01-21 | 中电华瑞技术有限公司 | Power supply network topology identification method and device |
| US20210132124A1 (en) * | 2019-11-01 | 2021-05-06 | Landis+Gyr Innovations, Inc. | Crosstalk cancelation for electricity metering |
| CN111030097A (en) * | 2019-12-11 | 2020-04-17 | 江苏方天电力技术有限公司 | Low-voltage distribution network platform area topology identification method and system |
| CN111463779A (en) * | 2020-04-23 | 2020-07-28 | 威胜信息技术股份有限公司 | Power distribution station topology identification system and method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114142464A (en) * | 2021-11-26 | 2022-03-04 | 深圳市锐能微科技有限公司 | Low-voltage transformer area topology identification method and device based on characteristic current signal detection |
| CN114142464B (en) * | 2021-11-26 | 2024-03-22 | 深圳市锐能微科技有限公司 | Low-voltage transformer area topology identification method and device based on characteristic current signal detection |
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Application publication date: 20210831 |