CN108896805B - Chopped wave signal verification method and system and electric energy detection device - Google Patents
Chopped wave signal verification method and system and electric energy detection device Download PDFInfo
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Abstract
The invention discloses a method and a system for calibrating a chopping signal and an electric energy detection device, wherein the method comprises the following steps: sampling the power signal in real time, and performing waveform restoration on the sampled signal; carrying out integrity analysis on the recovered sampling signal, and judging whether the sampling signal is in a chopping state; judging the chopping type according to the chopping state of the sampling signal; and according to the chopping type, carrying out information analysis or validity processing on the sampling signal. The invention can timely acquire the information carried by the chopping communication, ensure the measurement precision of the electric energy device and simultaneously ensure the basic benefits of the electric power bureau by monitoring the chopping signal in real time and analyzing or effectively processing the chopping signal.
Description
Technical Field
The invention relates to a chopping processing technology, in particular to a chopping signal verification method and system and an electric energy detection device.
Background
The chopping signal of the power line is divided into direct current chopping and alternating current chopping, and is a signal processing mode for carrying out partial signal chopping (or chopping of irregular angles of sine and cosine signals) on the power line signal by means of a thyristor and an auxiliary control circuit.
The application of the power line chopping signal in the field of electric energy meters is divided into two types:
1) the application of certain special signal communication of the power line is carried out through the small-angle chopping signals, and due to the characteristics that the chopping angle is small, the power grid signals of the power line are easy to interfere and the like, the chopping communication signals of the power line are difficult to detect, so that the monomer information transmitted by the chopping signals is difficult to identify; for such a situation, the existing electric energy meter cannot effectively detect the occurrence of power line chopping, and cannot identify (analyze) monomer information carried by a chopping signal;
2) the method is applied to power line chopping electricity stealing of an electric energy meter metering system, the metering of the electric energy meter is mainly carried out power calculation by voltage AD sampling and current AD sampling of a metering unit, so that the electricity utilization condition of a user is calculated, but some lawless persons chop signals of the voltage sampling part of the electric energy meter from an input end by using a special electricity stealing mode, the integrity of the signals is damaged, the effective value of the voltage actually sampled by the electric energy meter is smaller than the effective value of the voltage actually applied by the user, and the purpose of electricity stealing is achieved, and the electricity stealing mode is called power line chopping electricity stealing;
in addition, the effective value of the voltage vector of an actual user in application cannot be obtained by sampling of the electric energy meter, the effective value is seriously influenced in the process of calculating the electric energy, the chopper is connected to the electric energy meter verification equipment, and when the electric energy meter performs precision verification on the precision verification equipment, the real-time precision error (between the real-time precision error and the standard verification equipment) of the electric energy meter changes along with the change of the angle of the chopper for chopping the voltage sampling signal of the electric energy meter, so that the error of the electric energy meter relative to the standard verification equipment exceeds the range of the metering precision requirement of the electric energy meter.
In view of the above, it is desirable to provide a method and an apparatus for calibrating a chopped signal, so as to solve the above technical problems.
Disclosure of Invention
In order to solve the technical problems, the invention provides a chopped wave signal verification method, a chopped wave signal verification system and an electric energy detection device.
In order to achieve the above object, an aspect of the present invention provides a chopper signal detecting method, including the steps of:
sampling the power signal in real time, and performing waveform restoration processing on the sampled signal to obtain a restored sampled signal;
carrying out integrity analysis on the recovered sampling signal and judging whether the recovered sampling signal is in a chopping state or not;
and if the sampling signal is in the chopping state, judging the chopping type according to the waveform characteristics of the restored sampling signal.
As a preferred technical solution, the waveform restoration processing on the sampling signal specifically includes: and arranging the voltages of the sampling points according to a time sequence and carrying out fitting treatment to obtain a recovered sampling signal.
As a preferred technical solution, the performing integrity analysis on the recovered sampled signal and determining whether the recovered sampled signal is in a chopping state specifically includes: and judging whether the recovered sampling signal is complete or not and whether the recovered sampling signal has waveform mutation or not, and judging that the sampling waveform is in a chopping state according to the incompleteness or waveform mutation condition of the recovered sampling signal.
As a preferred technical solution, the determining the type of the chopping according to the waveform characteristics specifically includes: whether the actual measurement result of the metering equipment is influenced according to the form of the chopping signal mutation to judge that the chopping is chopping communication or chopping electricity stealing is to divide the chopping type into chopping communication or chopping electricity stealing, and the main distinction is as follows: the integrity of a voltage sampling signal of the metering equipment is influenced only by the electricity stealing chopping wave in a wiring mode and the electricity stealing equipment, a new working circuit of the electric equipment can be completely formed by the electricity stealing end by means of a near end, and the actual metering equipment has less electric energy; the chopping communication is two cases, wherein the case 1 is that the voltage and current of the metering equipment are simultaneously influenced during data processing, and the imperfection of the sampling waveform is embodied as the same mutation type of the same frequency and same phase type, the chopping signal does not influence the normal metering of the metering equipment, and the electricity stealing cannot be achieved, but the signal carrying information analysis can be carried out by an agreed protocol after the chopping detection, the case 2 is that the chopping signal with a specified tiny angle is not changed or the normal metering of the metering equipment is not influenced even if the tiny angle is not changed, and the chopping communication is determined according to the detection result.
As a preferred technical solution, the details of the abnormal sudden change include power line direct-current pulse type chopping and alternating-current regular or irregular angle abnormal chopping; if the abnormal sudden change details are direct current pulse type chopping of the power line, the chopping type is chopping electricity stealing; and if the abnormal mutation details are alternating current regular or irregular angle chopping, the chopping type is chopping communication.
As a preferred technical solution, the chopped signal detection method further includes: and after the chopping type is judged, carrying out information analysis or validity processing on the recovered sampling signal according to the chopping type.
As a preferred technical solution, the analyzing information or analyzing validity of the restored sampled signal according to the type of chopping specifically includes: if the chopping state is chopping communication, analyzing communication information carried by the chopping waveform through a communication protocol;
and if the chopping state is judged to be chopping electricity stealing, replacing the chopping voltage with the rated voltage to perform in-phase vector operation with the actual current to obtain the actual power consumption of the sampling signal.
In another aspect of the present invention, a chopper signal calibrating apparatus is provided, which includes a sampling and waveform restoring unit, a waveform analyzing unit, a chopper type determining unit, and a chopper processing unit; the sampling and waveform restoring unit, the waveform analyzing unit, the chopping type judging unit and the chopping processing unit are sequentially connected; wherein,
the sampling and waveform restoration unit is used for sampling the power signal in real time and carrying out waveform restoration processing on the sampled signal to obtain a restored sampled signal;
the waveform analysis unit is used for carrying out integrity analysis on the recovered sampling signal and judging whether the recovered sampling signal is in a chopping state or not;
the chopping type judging unit is used for judging the chopping type according to the waveform characteristics of the recovered sampling signal;
and the chopping processing unit is used for carrying out information analysis or validity processing on the restored sampling signal according to the chopping type.
As a preferred technical solution, the sampling and waveform restoring unit includes a sampling circuit and a micro control module, the sampling circuit is connected to the micro control module, the sampling circuit is connected to a sampled line, and collects a power signal on the sampled line in real time, and transmits the sampled signal to the micro control module in real time to restore the waveform; the micro control module is connected with the waveform analysis unit and transmits the recovered sampling waveform to the waveform analysis unit to judge the chopping state.
As a preferred technical solution, the sampling circuit includes at least two sampling resistors connected in series, and the micro control module is connected in parallel with the latter sampling resistor.
As still another aspect of the present invention, an electric energy detection device is provided, wherein the electric energy detection device includes the chopper signal verification system.
Compared with the prior art, the invention has the beneficial effects that:
the invention can timely acquire the information carried by the chopping communication, ensure the measurement precision of the electric energy device and simultaneously ensure the basic benefits of the electric power bureau by monitoring the chopping signal in real time and analyzing or effectively processing the chopping signal.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic diagram of a chopped signal detection method according to the first embodiment;
fig. 2 is a schematic diagram of standard undisturbed information according to the first embodiment;
fig. 3 is a schematic diagram of information interfered by a chopping signal according to the first embodiment.
Detailed Description
The invention is further described with reference to the following figures and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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 example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example one
As shown in fig. 1, a method for detecting a chopped signal includes the following steps:
s01: sampling the power signal in real time, and performing waveform restoration processing on the sampled signal to obtain a restored sampled signal;
and arranging the voltages of the sampling points according to a time sequence and carrying out fitting treatment to obtain a recovered sampling signal.
S02: carrying out integrity analysis on the recovered sampling signal, and judging whether the recovered sampling signal is in a chopping state;
and judging whether the recovered sampling signal is complete or not and whether the recovered sampling signal has waveform mutation or not, and judging that the sampling waveform is in a chopping state according to the missing condition or the waveform mutation condition of the recovered sampling signal. Specifically, the method comprises the following steps: the method comprises the steps of carrying out differential operation on each sampling point on a restored sampling signal, calculating a difference value between two adjacent sampling points by using a second-order difference algorithm to obtain new data Xn, then comparing the Xn with a preset threshold value G, meanwhile updating data C of a counter according to a comparison result, finally comparing the data C with a counter value D preset by a system after data comparison is finished, obtaining a judgment basis value E, judging whether chopping occurs or not according to the value of E (for example, if C is equal to D, E is 1, chopping occurs, if C is not equal to D, E is 0, and chopping does not occur), and if chopping occurs, judging that the restored sampling signal is in a chopping state.
The gate limit G and counter D are explained as follows: threshold value G: set to 200. The calculation formula of the threshold value G is as follows:
g-sampled peak × max (V)(sin (2. pai/number of samples in a single cycle))
Wherein, V(sin (2. pai/number of samples in a single cycle)Representing the change rate of sin (2 × pai/number of sampling points in a single period), if sampling points in the single period take 64, the detected peak value is 800, and the result is calculated to obtain the value of G which is 200 (if the sampling points in the single period take 128, the value of G is 100, the maximum value of the change rate of sin (2 × pai/64) under 64 sampling points takes 0.25; the maximum value of the change rate of sin (x) is influenced by the sampling rate); counter value D preset by the system: set to 2. Here, in this embodiment, the ideal value of the counter is set to 0, and the compensation value is set to 1, and the threshold value is set to 2. The ideal value is the value of the counter when the sampling signal is completely free of interference; the compensation value is a counter value when the sampling signal has an interference signal, but the chopping signal cannot be determined whether exists in the sampling signal according to the interference signal, and correspondingly, the threshold value is a value of the counter when the sampling signal is in a chopping state; in the above, the data C for updating the counter according to the comparison result is: according to the judgment result made on the interfered condition of the sampling signal.
S03: if the recovered sampling signal is in a chopping state, judging a chopping type according to the waveform characteristics of the recovered sampling signal;
and classifying the chopping type into chopping communication or chopping electricity stealing according to the abnormal mutation details of the chopping. Specifically, the method comprises the following steps: the abnormal sudden change details generally comprise direct-current pulse type chopping of a power line and regular or irregular angle abnormal chopping of alternating current; if the abnormal sudden change details are direct current pulse type chopping of the power line, the chopping type is chopping electricity stealing; and if the abnormal mutation details are alternating current regular or irregular angle chopping, the chopping type is chopping communication. It should be noted here that the chopping communication is generally a small-angle chopping signal, and because the small-angle chopping signal has small abrupt change characteristics and is difficult to distinguish in interference modes of different load modes of the power line, the present embodiment adopts a sigma-delta ADC and a common ADC of an integrated metering chip to perform double sampling, judges the small-angle abnormal chopping signal by using a standard second-order difference algorithm and a peak comparison method of adjacent sampling signals, sets the occurrence frequency of continuous abnormal signals as one of judgment thresholds, and judges a signal having an abrupt change period in a continuous period as a small-angle chopping signal, that is, a chopping communication signal; in addition, because the number of sampling points of the ADC of the integrated metering chip is 64 points per signal period, and the number of sampling points of the general ADC is 256 points per signal period, the judgment result of this embodiment can effectively eliminate the signal abnormal influence caused by standard harmonic interference.
S04: and according to the chopping type, carrying out information analysis or validity processing on the restored sampling signal.
If the chopper communication is judged, information analysis is carried out on the recovered sampling signal, and the method specifically comprises the following steps: according to a communication protocol with a client, assuming that signal chopping in a single period is judged to be carried information monomer '1', a non-chopping single-period signal is judged to be information monomer '0', meanwhile, a judgment state is drawn to be a fixed value, here, the information drawn to be '1111' is a judgment action order, as shown in fig. 2, an actual signal capture diagram is obtained, no chopping signal is detected in a signal period from 1 to 7, and the judgment information is '0000000'; if the signal is interfered by the chopper signal, as shown in fig. 3, in the signal period 1 to the signal period 7, the occurrence of the chopper is detected and accurately judged in the signal period 1 to the signal period 4, the occurrence of the chopper signal is detected, and the judgment information is '1111000', and the legal action command is executed if the analysis information judges that the prescribed legal action information '1111' is carried, or the legal action command is not executed if the analysis information does not carry the legal action information '1111'.
And if the chopping state is judged to be chopping electricity stealing, replacing the chopping voltage with the rated voltage to perform in-phase vector operation with the actual current to obtain the actual power consumption of the sampling signal.
Example two:
a chopped wave signal verification system comprises a sampling and waveform restoring unit, a waveform analyzing unit, a chopped wave type judging unit and a chopped wave processing unit; wherein, the sampling and waveform restoring unit, the waveform analyzing unit, the chopping type judging unit and the chopping processing unit are sequentially connected; wherein,
the sampling and waveform restoration unit is used for sampling the power signal in real time and carrying out waveform restoration processing on the sampled signal to obtain a restored sampled signal;
the waveform analysis unit is used for carrying out integrity analysis on the recovered sampling signal and judging whether the recovered sampling signal is in a chopping state or not;
a chopping type judging unit for judging the chopping type according to the chopping state of the restored sampling signal;
and the chopping processing unit is used for carrying out information analysis or validity processing on the restored sampling signal according to the chopping type.
Example three:
the present embodiment provides an electric energy meter, which includes the chopper signal calibrating apparatus in the second embodiment.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Of course, these computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Further, it should be noted that:
reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (7)
1. A chopped wave signal detection method is characterized by comprising the following steps:
sampling the power signal in real time, and performing waveform restoration processing on the sampled signal to obtain a restored sampled signal;
carrying out integrity analysis on the recovered sampling signal and judging whether the recovered sampling signal is in a chopping state or not;
if the sampling signal is in a chopping state, judging the chopping type according to the waveform characteristics of the recovered sampling signal;
the integrity analysis of the recovered sampling signal and the judgment of whether the recovered sampling signal is in a chopping state specifically comprise the following steps: judging whether the recovered sampling signal is complete or not and whether the recovered sampling signal has waveform mutation or not, and judging whether the sampling waveform is in a chopping state or not according to the missing condition or the waveform mutation condition of the recovered sampling signal;
the specific judgment of the chopping type according to the waveform characteristics of the restored sampling signal is as follows: dividing the chopping type into chopping communication or chopping electricity stealing according to the abnormal mutation details of chopping;
details of the aberrant mutation include: the method comprises the following steps of (1) performing direct-current pulse type chopping and alternating-current regular or irregular angle chopping on a power line; if the abnormal sudden change details are direct current pulse type chopping of the power line, the chopping type is chopping electricity stealing; and if the abnormal mutation details are alternating current regular or irregular angle chopping, the chopping type is chopping communication.
2. The chopper signal verification method according to claim 1, wherein the waveform restoration processing on the sampling signal is specifically: and arranging the voltages of the sampling points according to a time sequence and carrying out fitting treatment to obtain a complete waveform of the recovered sampling signal.
3. The chopper signal verification method of claim 1, further comprising: and after the chopping type is judged, carrying out information analysis or validity processing on the recovered sampling signal according to the chopping type.
4. The chopper signal verification method according to claim 3, wherein the analyzing information or the analyzing validity of the restored sampled signal according to the chopper type specifically includes: if the chopping state is chopping communication, analyzing communication information carried by the chopping waveform through a communication protocol;
and if the chopping state is judged to be chopping electricity stealing, replacing the chopping voltage with the rated voltage to perform in-phase vector operation with the actual current to obtain the actual power consumption of the sampling signal.
5. A chopped wave signal verification system is characterized by comprising a sampling and waveform restoring unit, a waveform analyzing unit, a chopped wave type judging unit and a chopped wave processing unit; the sampling and waveform restoring unit, the waveform analyzing unit, the chopping type judging unit and the chopping processing unit are sequentially connected; the sampling and waveform restoration unit is used for sampling the power signal in real time and carrying out waveform restoration processing on the sampled signal to obtain a restored sampled signal;
the waveform analysis unit is used for carrying out integrity analysis on the recovered sampling signal and judging whether the recovered sampling signal is in a chopping state or not;
the chopping type judging unit is used for judging the chopping type according to the chopping shape characteristic of the restored sampling signal;
and the chopping processing unit is used for carrying out information analysis or validity processing on the sampling signal according to the chopping type.
6. The chopped signal verification system according to claim 5, wherein the sampling and waveform restoration unit comprises a sampling circuit and a micro-control module, the sampling circuit is connected with the micro-control module, the sampling circuit is connected with a sampled line and collects a power signal on the sampled line in real time, and transmits the sampled signal to the micro-control module in real time for waveform restoration; the micro control module is connected with the waveform analysis unit and transmits the recovered sampling waveform to the waveform analysis unit to judge the chopping state.
7. An electrical energy detection device comprising the chopped signal verification device of any one of claims 5-6 within the electrical energy device.
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| CN110068716A (en) * | 2019-05-16 | 2019-07-30 | 宁波三星医疗电气股份有限公司 | Stealing detection method and device |
| CN111679112B (en) * | 2020-06-18 | 2022-06-28 | 杭州炬华科技股份有限公司 | Electric energy meter electricity stealing type judging method and device, computer equipment and storage medium |
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