CN110161301B - Anti-interference lightning current waveform acquisition algorithm - Google Patents
Anti-interference lightning current waveform acquisition algorithm Download PDFInfo
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- CN110161301B CN110161301B CN201910548584.9A CN201910548584A CN110161301B CN 110161301 B CN110161301 B CN 110161301B CN 201910548584 A CN201910548584 A CN 201910548584A CN 110161301 B CN110161301 B CN 110161301B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0046—Arrangements for measuring currents or voltages or for indicating presence or sign thereof characterised by a specific application or detail not covered by any other subgroup of G01R19/00
- G01R19/0053—Noise discrimination; Analog sampling; Measuring transients
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/04—Measuring peak values or amplitude or envelope of ac or of pulses
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/14—Indicating direction of current; Indicating polarity of voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
Abstract
The invention discloses an anti-interference lightning current waveform acquisition algorithm. The acquisition algorithm acquires multi-path lightning current waveform sampling data on the same power transmission line; compared with the existing algorithm, the invention removes the later-stage complex waveform characteristic comparison algorithm in the existing algorithm, can quickly and accurately identify the lightning current waveform, realizes the missing-free acquisition record, can greatly simplify the acquisition circuit design by utilizing the acquisition algorithm, can carry out acquisition and processing by only a simple FPGA circuit, saves the design resource, and is convenient for large-scale application and popularization. Is suitable for popularization and application in the field of on-line monitoring.
Description
Technical Field
The invention relates to the field of online monitoring, in particular to an anti-interference lightning current waveform acquisition algorithm.
Background
Lightning stroke is an important factor influencing the operation safety of a power transmission line, due to the requirement of electric power safety, a large number of lightning current acquisition devices are required to be arranged to accurately capture lightning current data generated on each power distribution network so as to accurately protect and manage the power transmission and distribution lines, the existing lightning current acquisition devices generally adopt a feature recognition algorithm to identify lightning current waveforms and interference waveforms, the algorithm needs to acquire a large number of lightning current feature data, and clutter signals can be removed only by depending on a post processor to perform complex operation, so that the circuit design of the lightning current acquisition devices is complex, the resource consumption is large, and the lightning current acquisition devices are not beneficial to large-scale popularization and application.
Disclosure of Invention
The invention aims to solve the technical problem of providing an anti-interference lightning current waveform acquisition algorithm which can effectively remove clutter interference, can quickly extract a lightning current waveform, saves resource consumption and is beneficial to large-scale popularization and application on a power transmission line.
The technical scheme adopted by the invention for solving the technical problems is as follows: the anti-interference lightning current waveform acquisition algorithm comprises the following steps:
A. setting an acquisition amplitude threshold, an amplitude difference range, an amplitude similarity ratio, a waveform trigger polarity and a frequency range of a lightning waveform;
B. acquiring multiple paths of lightning current waveform voltage analog signals on the same power transmission line, respectively performing acquisition amplitude threshold judgment on the acquired multiple paths of lightning current waveform voltage analog signals, removing the lightning current waveform voltage analog signals smaller than the acquisition amplitude threshold, and respectively converting the rest lightning current waveform voltage analog signals into digital signals through an ADC (analog-to-digital converter) to obtain multiple paths of sampling data;
C. comparing the amplitudes of the multiple paths of sampling data in pairs to obtain multiple groups of amplitude difference values, judging each group of obtained amplitude difference values with a set amplitude difference range, counting the number of the amplitudes falling into the amplitude difference range, calculating the proportion value of the number of the amplitudes occupying the group of the multiple paths of sampling data, comparing the obtained proportion with the set amplitude similarity ratio, judging the waveforms of the two paths of sampling data of the group to be valid lightning current waveforms if the calculated proportion is larger than the set amplitude similarity ratio, judging the waveforms of the two paths of sampling data of the group to be invalid lightning current waveforms if the calculated proportion is smaller than or equal to the set amplitude similarity ratio, and rejecting the corresponding two paths of invalid sampling data;
D. c, judging the polarity of the obtained multi-path sampling data to obtain the waveform trigger polarity of the multi-path sampling data, comparing and judging the obtained waveform trigger polarity of each path with the set waveform trigger polarity, if the waveform trigger polarities of the two paths are the same, judging the waveform of the sampling data to be an effective lightning current waveform, if the waveform trigger polarities of the two paths are different, judging the waveforms of the two paths of sampling data to be an invalid lightning current waveform, and rejecting the corresponding two paths of invalid sampling data;
E. d, performing filtering processing and Fourier transform processing on the multi-path sampling data obtained after the processing in the step D to obtain the frequency of the multi-path sampling data, comparing and judging the frequency of each obtained path of sampling data with a set frequency range, judging the waveform of the path of sampling data to be an effective lightning current waveform if the frequency of the path of sampling data falls within the set frequency range, judging the waveform of the two paths of sampling data to be an ineffective lightning current waveform if the frequency of the path of sampling data does not fall within the set frequency range, and rejecting the corresponding two paths of ineffective sampling data;
F. and E, extracting the frequency, the maximum amplitude and the waveform trigger polarity of the effective lightning current waveform obtained in the step E, counting the frequency, the amplitude, the waveform trigger polarity and the lightning stroke frequency of the lightning current waveform, calculating the amplitude mean value and the power value of the lightning current waveform, reporting the obtained data to a remote control terminal, and finishing the acquisition of the lightning current waveform.
Further, in the step B, the lightning current waveform voltage analog signals on the same power transmission line are obtained in two paths.
Further, a Rogowski coil sensor is adopted to obtain a lightning current waveform voltage analog signal on the same power transmission line.
The invention has the beneficial effects that: the anti-interference lightning current waveform acquisition algorithm is characterized in that multiple paths of lightning current waveform voltage analog signals on the same power transmission line are acquired, acquisition amplitude threshold judgment is respectively carried out on the acquired multiple paths of lightning current waveform voltage analog signals, the lightning current waveform voltage analog signals smaller than the acquisition amplitude threshold are removed, and the rest lightning current waveform voltage analog signals are respectively converted into digital signals through an ADC (analog-to-digital converter) to obtain multiple paths of sampling data; compared with the existing algorithm, the invention removes the later-stage complex waveform characteristic comparison algorithm in the existing algorithm, can quickly and accurately identify the lightning current waveform, realizes the missing-free acquisition record, and can greatly simplify the acquisition circuit design by utilizing the anti-interference lightning current waveform acquisition algorithm, only a simple FPGA circuit is needed for acquisition and processing, thereby saving the design resource and facilitating the large-scale application and popularization.
Detailed Description
The anti-interference lightning current waveform acquisition algorithm comprises the following steps:
A. setting an acquisition amplitude threshold, an amplitude difference range, an amplitude similarity ratio, a waveform trigger polarity and a frequency range of a lightning waveform; the specific parameter value can be set according to the actual situation;
B. acquiring multiple paths of lightning current waveform voltage analog signals on the same power transmission line, respectively performing acquisition amplitude threshold judgment on the acquired multiple paths of lightning current waveform voltage analog signals, removing the lightning current waveform voltage analog signals smaller than the acquisition amplitude threshold, and respectively converting the rest lightning current waveform voltage analog signals into digital signals through an ADC (analog-to-digital converter) to obtain multiple paths of sampling data;
C. comparing the amplitudes of the multiple paths of sampling data in pairs to obtain multiple groups of amplitude difference values, judging each group of obtained amplitude difference values with a set amplitude difference range, counting the number of the amplitudes falling into the amplitude difference range, calculating the proportion value of the number of the amplitudes occupying the group of the multiple paths of sampling data, comparing the obtained proportion with the set amplitude similarity ratio, judging the waveforms of the two paths of sampling data of the group to be valid lightning current waveforms if the calculated proportion is larger than the set amplitude similarity ratio, judging the waveforms of the two paths of sampling data of the group to be invalid lightning current waveforms if the calculated proportion is smaller than or equal to the set amplitude similarity ratio, and rejecting the corresponding two paths of invalid sampling data;
D. c, judging the polarity of the obtained multi-path sampling data to obtain the waveform trigger polarity of the multi-path sampling data, comparing and judging the obtained waveform trigger polarity of each path with the set waveform trigger polarity, if the waveform trigger polarities of the two paths are the same, judging the waveform of the sampling data to be an effective lightning current waveform, if the waveform trigger polarities of the two paths are different, judging the waveforms of the two paths of sampling data to be an invalid lightning current waveform, and rejecting the corresponding two paths of invalid sampling data;
E. d, performing filtering processing and Fourier transform processing on the multi-path sampling data obtained after the processing in the step D to obtain the frequency of the multi-path sampling data, comparing and judging the frequency of each obtained path of sampling data with a set frequency range, judging the waveform of the path of sampling data to be an effective lightning current waveform if the frequency of the path of sampling data falls within the set frequency range, judging the waveform of the two paths of sampling data to be an ineffective lightning current waveform if the frequency of the path of sampling data does not fall within the set frequency range, and rejecting the corresponding two paths of ineffective sampling data;
F. and E, extracting the frequency, the maximum amplitude and the waveform trigger polarity of the effective lightning current waveform obtained in the step E, counting the frequency, the amplitude, the waveform trigger polarity and the lightning stroke frequency of the lightning current waveform, calculating the amplitude mean value and the power value of the lightning current waveform, reporting the obtained data to a remote control terminal, and finishing the acquisition of the lightning current waveform.
The anti-interference lightning current waveform acquisition algorithm is characterized in that multiple paths of lightning current waveform voltage analog signals on the same power transmission line are acquired, acquisition amplitude threshold judgment is respectively carried out on the acquired multiple paths of lightning current waveform voltage analog signals, the lightning current waveform voltage analog signals smaller than the acquisition amplitude threshold are removed, and the rest lightning current waveform voltage analog signals are respectively converted into digital signals through an ADC (analog-to-digital converter) to obtain multiple paths of sampling data; compared with the existing algorithm, the invention removes the later-stage complex waveform characteristic comparison algorithm in the existing algorithm, can quickly and accurately identify the lightning current waveform, realizes the missing-free acquisition record, and can greatly simplify the acquisition circuit design by utilizing the anti-interference lightning current waveform acquisition algorithm, only a simple FPGA circuit is needed for acquisition and processing, thereby saving the design resource and facilitating the large-scale application and popularization.
In the above embodiment, in step B, the acquisition of the lightning current waveform voltage analog signal on the same power transmission line may be performed in multiple paths, and preferably, the two paths may meet the acquisition requirement, and the design difficulty of the acquisition circuit may not be increased. The method can acquire lightning current waveform voltage on the same power transmission line by adopting various existing lightning current acquisition sensors to acquire lightning current data, and preferably adopts a Rogowski coil sensor to acquire a lightning current waveform voltage analog signal on the same power transmission line.
Claims (3)
1. An anti-interference lightning current waveform acquisition algorithm is characterized by comprising the following steps:
A. setting an acquisition amplitude threshold, an amplitude difference range, an amplitude similarity ratio, a waveform trigger polarity and a frequency range of a lightning waveform;
B. acquiring multiple paths of lightning current waveform voltage analog signals on the same power transmission line, respectively performing acquisition amplitude threshold judgment on the acquired multiple paths of lightning current waveform voltage analog signals, removing the lightning current waveform voltage analog signals smaller than the acquisition amplitude threshold, and respectively converting the rest lightning current waveform voltage analog signals into digital signals through an ADC (analog-to-digital converter) to obtain multiple paths of sampling data;
C. comparing the difference values of the amplitudes of the multi-path sampling data in pairs to obtain a plurality of groups of amplitude difference values, judging each group of obtained amplitude difference values with a set amplitude difference range, counting the number of the amplitudes falling into the amplitude difference range, calculating the proportion value of the amplitudes occupying the group of the amplitude difference values, comparing the obtained proportion with the set amplitude similarity proportion, judging the waveform of the two paths of sampling data of the group as an effective lightning current waveform if the calculated proportion is greater than the set amplitude similarity proportion; if the calculated ratio is smaller than or equal to the set amplitude similarity ratio, judging that the waveforms of the two paths of sampling data of the group are invalid lightning current waveforms, and rejecting the corresponding two paths of invalid sampling data;
D. c, judging the polarity of the multi-path sampling data obtained after the processing in the step C to obtain the waveform trigger polarity of the multi-path sampling data, comparing and judging the obtained waveform trigger polarity of each path with the set waveform trigger polarity, and judging the waveforms of the two paths of sampling data to be effective lightning current waveforms if the waveform trigger polarities of the two paths of sampling data are the same; if the waveform trigger polarities of the two sampling data are different, judging that the waveforms of the two sampling data are invalid lightning current waveforms, and eliminating the corresponding two sampling data;
E. d, performing filtering processing and Fourier transform processing on the multi-path sampling data obtained after the processing in the step D to obtain the frequency of the multi-path sampling data, comparing and judging the frequency of each obtained path of sampling data with a set frequency range, and judging that the waveforms of the two paths of sampling data are effective lightning current waveforms if the frequencies of the two paths of sampling data fall within the set frequency range; if the frequency of the two paths of sampling data does not fall into the set frequency range, judging that the waveforms of the two paths of sampling data are invalid lightning current waveforms, and rejecting the corresponding two paths of invalid sampling data;
F. and E, extracting the frequency, the maximum amplitude and the waveform trigger polarity of the effective lightning current waveform obtained in the step E, counting the frequency, the amplitude, the waveform trigger polarity and the lightning stroke frequency of the lightning current waveform, calculating the amplitude mean value and the power value of the lightning current waveform, reporting the obtained data to a remote control terminal, and finishing the acquisition of the lightning current waveform.
2. The anti-jamming lightning current waveform acquisition algorithm of claim 1, wherein: and in the step B, acquiring lightning current waveform voltage analog signals on the same power transmission line into two paths.
3. The anti-jamming lightning current waveform acquisition algorithm of claim 2, wherein: and acquiring lightning current waveform voltage analog signals on the same power transmission line by adopting a Rogowski coil sensor.
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| CN110988448B (en) * | 2019-12-12 | 2022-02-08 | 厦门市爱维达电子有限公司 | Filtering method applied to UPS bus voltage sampling |
| CN112305406B (en) * | 2020-10-14 | 2024-03-15 | 上海华虹宏力半导体制造有限公司 | Chip tiny analog signal testing method and testing device |
| CN113447701B (en) * | 2021-05-18 | 2023-09-01 | 熊秀 | Lightning current peak value calibration method and device |
| CN113552445B (en) * | 2021-06-17 | 2023-03-14 | 昆明理工大学 | Multiple lightning stroke waveform parameter identification method |
| CN115840104B (en) * | 2023-02-24 | 2023-04-28 | 威海赛宝工业信息技术研究院有限公司 | Interference signal identification method based on electromagnetic compatibility experiment |
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