CN116184300A - Standard electric energy meter calibration method and system based on sampling method - Google Patents
Standard electric energy meter calibration method and system based on sampling method Download PDFInfo
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Abstract
The invention discloses a standard electric energy meter calibration method and system based on a sampling method. The method comprises the following steps: sampling a first low-voltage signal of a received voltage source through a first broadband sampling module, outputting a first voltage measurement digital signal to a preset electric energy calculation module, sampling a second low-voltage signal of a received current source through a second broadband sampling module, and outputting a second voltage measurement digital signal to the electric energy calculation module; the electric energy calculation module calculates standard electric energy values of the voltage source and the current source according to the first voltage measurement digital signal and the second voltage measurement digital signal; according to the received voltage and current output by the voltage source and the current source, the tested standard electric energy meter calculates an electric energy pulse electric measurement signal corresponding to the tested electric energy value of the voltage source and the current source; and calculating the measured electric energy value and the standard electric energy value according to the electric energy pulse electric measuring signal by an error processing module, and determining the measuring error of the tested standard electric energy meter.
Description
Technical Field
The invention relates to the technical field of electric energy calibration, in particular to a standard electric energy meter calibration method and system based on a sampling method.
Background
Along with the development and construction of electric automobile charging piles in recent years, the direct current electric energy metering technology also meets a rapid development stage, and the direct current electric energy working metering appliance and the direct current electric energy calibrating device gradually show multiple rationalizes and high accuracy. Compared with an alternating current electric energy standard meter, the direct current electric energy standard meter in the domestic market at present is mainly a domestic meter, direct access current is 500A or more, in addition, the accuracy grade of the direct current electric energy standard meter is also 0.01 level, and practical calibration is difficult.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a standard electric energy meter calibration method and system based on a sampling method.
According to one aspect of the present invention, there is provided a standard electric energy meter calibration method based on a sampling method, including:
sampling a first low-voltage signal of a received voltage source through a preset first broadband sampling module, outputting a first voltage measurement digital signal to a preset electric energy calculation module, sampling a second low-voltage signal of the received current source through a preset second broadband sampling module, and outputting a second voltage measurement digital signal to the preset electric energy calculation module;
the electric energy calculation module calculates standard electric energy values of the voltage source and the current source according to the first voltage measurement digital signal and the second voltage measurement digital signal;
according to the received voltage and current output by the voltage source and the current source, the tested standard electric energy meter calculates an electric energy pulse electric measurement signal corresponding to the tested electric energy value of the voltage source and the current source;
and calculating the measured electric energy value and the standard electric energy value according to the electric energy pulse electric measuring signal by a preset error processing module, and carrying out error calculation to determine the measurement error of the tested standard electric energy meter, wherein the measurement error is used for calibrating the tested standard electric energy meter.
Optionally, the operation of sampling the received first low voltage signal of the voltage source by the preset first wideband sampling module and outputting the first voltage measurement digital signal to the preset electric energy calculation module includes:
the voltage source outputs the voltage to a preset V/V voltage division module, and the V/V voltage division module converts the voltage into a first low voltage signal according to a preset first conversion ratio;
the first broadband sampling module samples the first low-voltage signal and outputs a first voltage measurement digital signal to the electric energy calculation module.
Optionally, the operation of sampling the second low voltage signal of the received current source by the preset second wideband sampling module and outputting the second voltage measurement digital signal to the preset electric energy calculation module includes:
the current source outputs current to a preset I/V proportion module, and the I/V proportion module converts the current into a second low-voltage signal according to a preset second conversion proportion;
the second broadband sampling module samples the second low-voltage signal and outputs a second voltage measurement digital signal to the electric energy calculation module.
Optionally, the operation of the power calculation module to calculate the standard power values of the voltage source and the current source according to the first voltage measurement digital signal and the second voltage measurement digital signal includes:
the electric energy calculation module calculates the voltage and the current output by the voltage source and the current source according to the first voltage measurement digital signal, the second voltage measurement digital signal and the second conversion proportion of the first conversion proportion;
the electric energy calculation module calculates a standard electric energy value according to the voltage and the current.
Optionally, the operation of calculating the measured electric energy value and the standard electric energy value according to the electric energy pulse electric measuring signal by a preset error processing module to perform error calculation, and determining the measurement error of the tested standard electric energy meter includes:
the tested standard electric energy meter determines an electric energy pulse electric measurement signal corresponding to the tested electric energy value according to the measured voltage source and the measured current source and sends the electric energy pulse electric measurement signal to a preset frequency meter;
the frequency meter tests the frequency value of the electric energy pulse electric test signal and transmits the frequency value to the error processing module;
the error processing module calculates a measured electric energy value according to the frequency value and a preset electric energy pulse constant of the measured standard electric energy meter, and calculates a measurement error according to the measured electric energy value and the standard electric energy value.
Optionally, the method further comprises:
when the standard electric energy meter to be tested is calibrated, the phase between the voltage source and the current source is set and adjusted according to the preset phase locking module.
According to another aspect of the present invention, there is provided a standard electric energy meter calibration system based on a sampling method, comprising: the standard electric energy meter calibration method based on the sampling method for realizing any one of the above steps comprises: the system comprises a first broadband sampling module, a second broadband sampling module, a voltage source, a current source, an electric energy calculation module, an error processing module and a tested standard electric energy meter, wherein
The voltage source and the current source are used for generating voltage and current;
the first broadband sampling module and the second broadband sampling module are respectively used for sampling voltage and current and outputting a first voltage measurement digital signal and a second voltage measurement digital signal;
the electric energy calculation module is used for calculating standard electric energy values of the voltage source and the current source according to the first voltage measurement digital signal and the second voltage measurement digital signal;
according to the received voltage and current output by the voltage source and the current source, the tested standard electric energy meter calculates an electric energy pulse electric measurement signal corresponding to the tested electric energy value of the voltage source and the current source;
the error processing module is used for calculating the measured electric energy value by the electric energy pulse electric measuring signal and carrying out error calculation on the measured electric energy value and the standard electric energy value, and determining the measuring error of the measured standard electric energy meter.
Optionally, the method further comprises: V/V voltage dividing module and I/V proportion module, wherein
The V/V voltage division module is used for converting the voltage of the voltage source into a first low voltage signal according to a preset first conversion ratio and outputting the first low voltage signal to the first broadband sampling module;
the I/V ratio module is used for converting the current of the current source into a second low-voltage signal according to a preset second conversion ratio and outputting the second low-voltage signal to the second broadband sampling module.
Optionally, the method further comprises: the frequency meter is used for testing the frequency value of the electric energy pulse electric test signal and transmitting the frequency value to the error processing module.
Optionally, the method further comprises: the phase locking module is connected in parallel with the tested standard electric energy meter and is used for setting and adjusting the phase between the voltage source and the current source when the tested standard electric energy meter is calibrated.
According to a further aspect of the present invention there is provided a computer readable storage medium storing a computer program for performing the method according to any one of the above aspects of the present invention.
According to still another aspect of the present invention, there is provided an electronic device including: a processor; a memory for storing the processor-executable instructions; the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method according to any of the above aspects of the present invention.
Therefore, the method for calibrating the electric energy standard meter by measuring voltage and current signals through a high-frequency sampling method and calculating accumulated electric energy through the electric energy calculating unit. The method can improve the accuracy of the calibration result and is suitable for calibrating the electric energy standard meter with high accuracy level. .
Drawings
Exemplary embodiments of the present invention may be more completely understood in consideration of the following drawings:
FIG. 1 is a flow chart of a standard electric energy meter calibration method based on a sampling method according to an exemplary embodiment of the present invention;
FIG. 2 is a schematic diagram of a standard electric energy meter calibration system based on a sampling method according to an exemplary embodiment of the present invention;
fig. 3 is a structure of an electronic device provided in an exemplary embodiment of the present invention.
Detailed Description
Hereinafter, exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. It should be apparent that the described embodiments are only some embodiments of the present invention and not all embodiments of the present invention, and it should be understood that the present invention is not limited by the example embodiments described herein.
It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.
It will be appreciated by those of skill in the art that the terms "first," "second," etc. in embodiments of the present invention are used merely to distinguish between different steps, devices or modules, etc., and do not represent any particular technical meaning nor necessarily logical order between them.
It should also be understood that in embodiments of the present invention, "plurality" may refer to two or more, and "at least one" may refer to one, two or more.
It should also be appreciated that any component, data, or structure referred to in an embodiment of the invention may be generally understood as one or more without explicit limitation or the contrary in the context.
In addition, the term "and/or" in the present invention is merely an association relationship describing the association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In the present invention, the character "/" generally indicates that the front and rear related objects are an or relationship.
It should also be understood that the description of the embodiments of the present invention emphasizes the differences between the embodiments, and that the same or similar features may be referred to each other, and for brevity, will not be described in detail.
Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and apparatus should be considered part of the specification.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Embodiments of the invention are operational with numerous other general purpose or special purpose computing system environments or configurations with electronic devices, such as terminal devices, computer systems, servers, etc. Examples of well known terminal devices, computing systems, environments, and/or configurations that may be suitable for use with the terminal device, computer system, server, or other electronic device include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, hand-held or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network personal computers, small computer systems, mainframe computer systems, and distributed cloud computing technology environments that include any of the foregoing, and the like.
Electronic devices such as terminal devices, computer systems, servers, etc. may be described in the general context of computer system-executable instructions, such as program modules, being executed by a computer system. Generally, program modules may include routines, programs, objects, components, logic, data structures, etc., that perform particular tasks or implement particular abstract data types. The computer system/server may be implemented in a distributed cloud computing environment in which tasks are performed by remote processing devices that are linked through a communications network. In a distributed cloud computing environment, program modules may be located in both local and remote computing system storage media including memory storage devices.
Exemplary method
Fig. 1 is a schematic flow chart of a standard electric energy meter calibration method based on a sampling method according to an exemplary embodiment of the invention. The embodiment can be applied to an electronic device, as shown in fig. 1, a standard electric energy meter calibration method 100 based on a sampling method includes the following steps:
step 101), sampling the first low voltage signal of the received voltage source 5) by the preset first wideband sampling module 1), outputting a first voltage measurement digital signal to the preset electric energy calculation module 8, and sampling the second low voltage signal of the received current source 6 by the preset second wideband sampling module 2, outputting a second voltage measurement digital signal to the preset electric energy calculation module 8.
Wherein the calibration platform is provided with a voltage source 5 and a current source 6. The method can meet the requirement of directly accessing the high-voltage and high-current measurement mode of the electric energy standard meter.
In step 102, the power calculation module 8 calculates the standard power values of the voltage source 5 and the current source 6 according to the first voltage measurement digital signal and the second voltage measurement digital signal.
And 104, calculating the measured electric energy value and the standard electric energy value according to the electric energy pulse electric test signal by a preset error processing module 9 to perform error calculation, and determining the measurement error of the tested standard electric energy meter 11, wherein the measurement error is used for calibrating the tested standard electric energy meter 11.
The small signal high-frequency sampling mode is adopted, the small signals output after the electric parameters of the voltage source 5 and the current source 6 are converted are sampled, more accurate values are obtained, and the accuracy of standard electric energy metering is improved.
Optionally, the operation of sampling the received first low voltage signal of the voltage source 5 by the preset first wideband sampling module 1 and outputting the first voltage measurement digital signal to the preset power calculation module 8 includes:
the voltage source 5 outputs the voltage to the preset V/V voltage division module 3, and the V/V voltage division module 3 converts the voltage into a first low voltage signal according to a preset first conversion ratio;
the first wideband sampling module 1 samples the first low voltage signal and outputs a first voltage measurement digital signal to the electric energy calculating module 8.
Optionally, the operation of sampling the received second low voltage signal of the current source 6 by the preset second wideband sampling module 2 and outputting the second voltage measurement digital signal to the preset power calculation module 8 includes:
the current source 6 outputs current to the preset I/V proportion module 4, and the I/V proportion module 4 converts the current into a second low-voltage signal according to a preset second conversion proportion;
the second wideband sampling module 2 samples the second low voltage signal and outputs a second voltage measurement digital signal to the power calculation module 8.
Optionally, the operation of the power calculation module 8 to calculate the standard power values of the voltage source 5 and the current source 6 from the first voltage measurement digital signal and the second voltage measurement digital signal includes:
the electric energy calculation module 8 calculates the voltage and the current output by the voltage source 5 and the current source 6 according to the first voltage measurement digital signal, the second voltage measurement digital signal and the second conversion ratio of the first conversion ratio;
the power calculation module 8 calculates a standard power value based on the voltage and the current.
The voltage/current output by the voltage source/current source of the calibration platform is accurately measured by adopting a small-signal high-frequency sampling mode and through proportional conversion.
Optionally, the operation of calculating the measured power value and the standard power value according to the power pulse electric test signal by the preset error processing module 9 to perform error calculation to determine the measurement error of the tested standard power meter 11 includes:
the tested standard electric energy meter 11 determines an electric energy pulse electric measurement signal corresponding to the tested electric energy value according to the measured voltage source 5 and the current source 6 and sends the electric energy pulse electric measurement signal to the preset frequency meter 10;
the frequency meter 10 tests the frequency value of the electric energy pulse electric test signal and transmits the frequency value to the error processing module 9;
the error processing module 9 calculates the measured electric energy value according to the frequency value and the preset electric energy pulse constant of the measured standard electric energy meter, and calculates the measurement error according to the measured electric energy value and the standard electric energy value.
Optionally, the method further comprises:
when the standard electric energy meter 11 to be tested is calibrated, the phase between the voltage source 5 and the current source 6 is set and adjusted according to the phase-locking module 7 which is preset.
Specifically, referring to fig. 2, the calibration system set up in the standard electric energy meter calibration method based on the sampling method provided by the invention is composed of the following modules: the device comprises a first broadband sampling module 1, a second broadband sampling module 2, a V/V voltage division module 3, an I/V proportion module 4, a voltage source 5, a current source 6, a phase locking module 7, an electric energy metering module 8, an error processing module 9 and a frequency meter 10.
In fig. 2, solid arrows indicate directions of electrical parameters of the respective module devices, and broken arrows indicate directions of data transmission of the electrical parameters.
As shown in fig. 2, the calibration system voltage source 5/current source 6 outputs voltage/current to the V/V voltage dividing module 3 and the I/V ratio module 4, respectively, and the V/V voltage dividing module 3 and the I/V ratio module 4 convert the input voltage/current into a first low voltage signal and a second low voltage signal in proportion, and output the first low voltage signal and the second low voltage signal to the first wideband sampling module 1 and the second wideband sampling module 2, respectively. The first wideband sampling module 1 and the second wideband sampling module 2 sample the first low voltage signal and the second low voltage signal, and convert the measured values into digital signals and output the digital signals to the electric energy metering module 8. Thus, the measurement of high voltage/large current magnitude is realized via the V/V voltage division module 3, the I/V proportion module 4 and the broadband sampling module 1/2.
The voltage and the current output by the voltage source 5 and the current source 6 are simultaneously supplied to the tested standard electric energy meter, wherein the voltage is output in parallel, and the current is output in series. The tested standard electric energy meter respectively measures the voltage and the current, calculates the tested electric energy value according to the voltage and the current, and outputs an electric energy pulse electric measuring signal corresponding to the electric energy value.
The power metering module 8 and the error processing module 9 are calibration system software core modules. The electric energy metering module 8 can calculate the voltage/current value output by the voltage source 5/current source 6 according to the received electric parameter value and the first conversion ratio value and the second conversion ratio value of the V/V voltage dividing module 3 and the I/V ratio module 4 respectively, and calculate the standard electric energy value according to the voltage/current value. And transmits the power value to the error processing module 9.
The frequency meter 10 tests the frequency of the electric energy pulse electric test signal output by the tested standard meter and transmits the frequency value to the error processing module 9. The error processing module 9 calculates the measured electric energy value in a certain time according to the preset electric energy pulse constant of the tested standard meter and the received frequency value. And the difference between the value and the standard electric energy value is used for calculating the electric energy error.
The standard electric energy meter calibration method based on the sampling method has the following advantages when actually calibrating the electric energy standard meter: 1. the calibration platform is configured with a voltage source and a current source. The method can meet the requirement of directly accessing the high-voltage and high-current measurement mode of the electric energy standard meter; 2. the method adopts a small signal high-frequency sampling mode, samples the small signals output after the output electric parameters of the 5 voltage source and the 6 current source are converted, and obtains more accurate values so as to improve the accuracy of standard electric energy metering. 3. The calibration platform is built by single units, each unit can select equipment with high accuracy and small expansion uncertainty, the related expansion uncertainty of the calibration platform can reach the requirement of being better than 20ppm, and the requirement of calibrating a high-accuracy grade such as a 0.01-grade electric energy standard meter is met.
Therefore, the method for calibrating the electric energy standard meter by measuring voltage and current signals through a high-frequency sampling method and calculating accumulated electric energy through the electric energy calculating unit. The method can improve the accuracy of the calibration result and is suitable for calibrating the electric energy standard meter with high accuracy level.
Exemplary apparatus
Fig. 2 is a schematic structural diagram of a standard electric energy meter calibration system based on a sampling method according to an exemplary embodiment of the present invention. As shown in fig. 2, the apparatus 200 includes:
the device comprises a first broadband sampling module 1, a second broadband sampling module 2, a voltage source 5, a current source 6, an electric energy calculation module 8, an error processing module 9 and a standard electric energy meter 11 to be tested, wherein
A voltage source 5 and a current source 6 for generating a voltage and a current;
the first broadband sampling module 1 and the second broadband sampling module 2 are respectively used for sampling voltage and current and outputting a first voltage measurement digital signal and a second voltage measurement digital signal;
the electric energy calculation module 8 is used for calculating standard electric energy values of the voltage source 5 and the current source 6 according to the first voltage measurement digital signal and the second voltage measurement digital signal;
the tested standard electric energy meter 11 calculates electric energy pulse electric measurement signals corresponding to the tested electric energy values of the voltage source 5 and the current source 6 according to the received voltage and current output by the voltage source 5 and the current source 6;
the error processing module 9 is used for calculating the measured electric energy value by the electric energy pulse electric measuring signal and carrying out error calculation on the standard electric energy value, so as to determine the measuring error of the tested standard electric energy meter 11.
Optionally, the method further comprises: V/V voltage dividing module 3 and I/V ratio module 4, wherein
The V/V voltage division module 3 is configured to convert the voltage of the voltage source 5 into a first low voltage signal according to a preset first conversion ratio, and output the first low voltage signal to the first wideband sampling module 1;
the I/V ratio module 4 is configured to convert the current of the current source 6 into a second low voltage signal according to a preset second conversion ratio, and output the second low voltage signal to the second wideband sampling module 2.
Optionally, the method further comprises: the frequency meter 10 is used for testing the frequency value of the electric power pulse electric test signal and transmitting the frequency value to the error processing module 9.
Optionally, the method further comprises: the phase locking module 7 is connected in parallel with the tested standard electric energy meter 11 and is used for setting and adjusting the phase between the voltage source 5 and the current source 6 when the tested standard electric energy meter 11 is calibrated.
Exemplary electronic device
Fig. 3 is a structure of an electronic device provided in an exemplary embodiment of the present invention. As shown in fig. 3, the electronic device 30 includes one or more processors 31 and memory 32.
The processor 31 may be a central processing module (CPU) or other form of processing module having data processing and/or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.
In addition, the input device 33 may also include, for example, a keyboard, a mouse, and the like.
The output device 34 can output various information to the outside. The output device 34 may include, for example, a display, speakers, a printer, and a communication network and remote output devices connected thereto, etc.
Of course, only some of the components of the electronic device that are relevant to the present invention are shown in fig. 3 for simplicity, components such as buses, input/output interfaces, etc. being omitted. In addition, the electronic device may include any other suitable components depending on the particular application.
Exemplary computer program product and computer readable storage Medium
In addition to the methods and apparatus described above, embodiments of the invention may also be a computer program product comprising computer program instructions which, when executed by a processor, cause the processor to perform steps in a method according to various embodiments of the invention described in the "exemplary methods" section of this specification.
The computer program product may write program code for performing operations of embodiments of the present invention in any combination of one or more programming languages, including an object oriented programming language such as Java, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device, partly on a remote computing device, or entirely on the remote computing device or server.
Furthermore, embodiments of the present invention may also be a computer-readable storage medium, having stored thereon computer program instructions which, when executed by a processor, cause the processor to perform the steps in a method of mining history change records according to various embodiments of the present invention described in the "exemplary methods" section above in this specification.
The computer readable storage medium may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium can include, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium would include the following: an electrical connection having one or more wires, a portable disk, a hard disk, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The basic principles of the present invention have been described above in connection with specific embodiments, however, it should be noted that the advantages, benefits, effects, etc. mentioned in the present invention are merely examples and not intended to be limiting, and these advantages, benefits, effects, etc. are not to be considered as essential to the various embodiments of the present invention. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the invention is not necessarily limited to practice with the above described specific details.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different manner from other embodiments, so that the same or similar parts between the embodiments are mutually referred to. For system embodiments, the description is relatively simple as it essentially corresponds to method embodiments, and reference should be made to the description of method embodiments for relevant points.
The block diagrams of the devices, systems, apparatuses, systems according to the present invention are merely illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, the devices, systems, apparatuses, systems may be connected, arranged, configured in any manner. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The terms "or" and "as used herein refer to and are used interchangeably with the term" and/or "unless the context clearly indicates otherwise. The term "such as" as used herein refers to, and is used interchangeably with, the phrase "such as, but not limited to.
The method and system of the present invention may be implemented in a number of ways. For example, the methods and systems of the present invention may be implemented by software, hardware, firmware, or any combination of software, hardware, firmware. The above-described sequence of steps for the method is for illustration only, and the steps of the method of the present invention are not limited to the sequence specifically described above unless specifically stated otherwise. Furthermore, in some embodiments, the present invention may also be embodied as programs recorded in a recording medium, the programs including machine-readable instructions for implementing the methods according to the present invention. Thus, the present invention also covers a recording medium storing a program for executing the method according to the present invention.
It is also noted that in the systems, devices and methods of the present invention, components or steps may be disassembled and/or assembled. Such decomposition and/or recombination should be considered as equivalent aspects of the present invention. The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the invention. Thus, the present invention is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit embodiments of the invention to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.
Claims (12)
1. The standard electric energy meter calibration method based on the sampling method is characterized by comprising the following steps of:
sampling a first low-voltage signal of a received voltage source (5) through a preset first broadband sampling module (1), outputting a first voltage measurement digital signal to a preset electric energy calculation module (8), sampling a second low-voltage signal of a received current source (6) through a preset second broadband sampling module (2), and outputting a second voltage measurement digital signal to the preset electric energy calculation module (8);
the electric energy calculation module (8) calculates standard electric energy values of the voltage source (5) and the current source (6) according to the first voltage measurement digital signal and the second voltage measurement digital signal;
according to the received voltage and current output by the voltage source (5) and the current source (6), the tested standard electric energy meter (11) calculates electric energy pulse electric measurement signals corresponding to the tested electric energy values of the voltage source (5) and the current source (6);
and calculating the measured electric energy value and the standard electric energy value according to the electric energy pulse electric test signal by a preset error processing module (9) to perform error calculation, and determining the measurement error of the tested standard electric energy meter (11), wherein the measurement error is used for calibrating the tested standard electric energy meter (11).
2. The method according to claim 1, characterized by the operation of sampling the received first low voltage signal of the voltage source (5) by a pre-set first broadband sampling module (1), outputting a first voltage measurement digital signal to a pre-set power calculation module (8), comprising:
the voltage source (5) outputs the voltage to a preset V/V voltage division module (3), and the V/V voltage division module (3) converts the voltage into the first low voltage signal according to a preset first conversion ratio;
the first broadband sampling module (1) samples the first low-voltage signal and outputs the first voltage measurement digital signal to the electric energy calculation module (8).
3. The method according to claim 2, characterized by the operation of sampling the second low voltage signal of the received current source (6) by a second broadband sampling module (2) preset, outputting a second voltage measurement digital signal to the power calculation module (8) preset, comprising:
the current source (6) outputs the current to a preset I/V proportion module (4), and the I/V proportion module (4) converts the current into the second low-voltage signal according to a preset second conversion proportion;
the second broadband sampling module (2) samples the second low-voltage signal and outputs the second voltage measurement digital signal to the electric energy calculation module (8).
4. A method according to claim 3, characterized in that the operation of the power calculation module (8) to calculate the standard power values of the voltage source (5) and the current source (6) from the first voltage measurement digital signal and the second voltage measurement digital signal comprises:
the electric energy calculation module (8) calculates the voltage and the current output by the voltage source (5) and the current source (6) according to the first voltage measurement digital signal, the second voltage measurement digital signal and the second conversion ratio of the first conversion ratio;
the power calculation module (8) calculates the standard power value from the voltage and the current.
5. A method according to claim 3, characterized in that the operation of determining the measurement error of the standard electric energy meter (11) under test by calculating the measured electric energy value from the electric energy pulse electric test signal by means of a pre-set error processing module (9) for error calculation with the standard electric energy value comprises:
the tested standard electric energy meter (11) determines the electric energy pulse electric measurement signal corresponding to the tested electric energy value according to the measured voltage source (5) and the measured current source (6) and sends the electric energy pulse electric measurement signal to a preset frequency meter (10);
the frequency meter (10) tests the frequency value of the electric energy pulse electric test signal and transmits the frequency value to the error processing module (9);
the error processing module (9) calculates the measured electric energy value according to the frequency value and a preset electric energy pulse constant of the measured standard electric energy meter, and calculates the measurement error according to the measured electric energy value and the standard electric energy value.
6. The method as recited in claim 1, further comprising:
when the tested standard electric energy meter (11) is calibrated, the phase between the voltage source (5) and the current source (6) is set and adjusted according to a preset phase locking module (7).
7. A standard electric energy meter calibration system based on a sampling method for implementing the standard electric energy meter calibration method based on a sampling method according to any one of claims 1 to 6, characterized by comprising: the device comprises a first broadband sampling module (1), a second broadband sampling module (2), a voltage source (5), a current source (6), an electric energy calculation module (8), an error processing module (9) and a standard electric energy meter (11) to be tested, wherein the first broadband sampling module is connected with the voltage source through a first cable
-said voltage source (5) and said current source (6) are adapted to generate a voltage and a current;
the first broadband sampling module (1) and the second broadband sampling module (2) are respectively used for sampling the voltage and the current and outputting a first voltage measurement digital signal and a second voltage measurement digital signal;
the electric energy calculation module (8) is used for calculating standard electric energy values of the voltage source (5) and the current source (6) according to the first voltage measurement digital signal and the second voltage measurement digital signal;
the tested standard electric energy meter (11) calculates electric energy pulse electric measurement signals corresponding to the tested electric energy values of the voltage source (5) and the current source (6) according to the received voltage and current output by the voltage source (5) and the current source (6);
the error processing module (9) is used for calculating the measured electric energy value by the electric energy pulse electric measuring signal and carrying out error calculation on the measured electric energy value and the standard electric energy value, so as to determine the measurement error of the tested standard electric energy meter (11).
8. The system of claim 7, further comprising: a V/V voltage dividing module (3) and an I/V proportion module (4), wherein
The V/V voltage dividing module (3) is used for converting the voltage of the voltage source (5) into a first low-voltage signal according to a preset first conversion proportion and outputting the first low-voltage signal to the first broadband sampling module (1);
the I/V ratio module (4) is used for converting the current of the current source (6) into a second low-voltage signal according to a preset second conversion ratio and outputting the second low-voltage signal to the second broadband sampling module (2).
9. The system of claim 7, further comprising: -a frequency meter (10) for testing the frequency value of the electrical power pulse signal and transmitting to the error processing module (9).
10. The system of claim 7, further comprising: the phase locking module (7) is connected in parallel with the tested standard electric energy meter (11) and is used for setting and adjusting the phase between the voltage source (5) and the current source (6) when the tested standard electric energy meter (11) is calibrated.
11. A computer readable storage medium, characterized in that the storage medium stores a computer program for executing the method of any of the preceding claims 1-6.
12. An electronic device, the electronic device comprising:
a processor;
a memory for storing the processor-executable instructions;
the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method of any of the preceding claims 1-6.
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