CN113567908A - Electric energy metering error evaluation method and device considering voltage fluctuation and temperature change - Google Patents
Electric energy metering error evaluation method and device considering voltage fluctuation and temperature change Download PDFInfo
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Abstract
The invention discloses an electric energy metering error evaluation method and device considering voltage fluctuation and temperature changestdCalculating the standard deviation V of the error deviation matrix V except the middle column after the front specified number of columns and the back specified number of columnsstd1Judgment condition vstd≤aνstd1And b vstdAnd whether S is equal to or less than S is determined, if yes, the metering error of the detected electric energy meter under the condition of simultaneous change of voltage fluctuation and magnetic field is determined to be qualified, otherwise, the metering error of the detected electric energy meter under the condition of simultaneous change of voltage fluctuation and magnetic field is determined to be unqualified. The invention can realize the electric energy meter metering error test of voltage fluctuation and magnetic field change, and solves the defect that the existing electric energy meter metering error test only considers a single factor.
Description
Technical Field
The invention belongs to the evaluation technology of electric energy metering devices, and particularly relates to an electric energy metering error evaluation method and device considering voltage fluctuation and temperature change.
Background
The intelligent electric energy meter is used as important sensing equipment at the tail end of the power internet of things sensing layer. The intelligent electric energy meter is limited by the existing sensor technology and the state sensing capability of the electric energy meter, the existing intelligent electric energy meter cannot accurately sense the state of the intelligent electric energy meter and the state of the operating environment, and therefore the metering performance of the intelligent electric energy meter under the complex working condition is difficult to accurately evaluate. At present, research and development are carried out on the measurement error evaluation of the electric energy meter under the conditions of temperature, current, humidity and flicker at home and abroad. However, most of the work only realizes the analysis of the influence of a single factor on the metering performance of the electric energy meter. When the electric energy meter works under a complex working condition, such as the situation that multiple factors of voltage change and magnetic field change occur simultaneously, the metering characteristic of the electric energy meter is often unpredictable. Therefore, the metering error evaluation of the electric energy meter under the complex working condition needs to be carried out through a scientific and reasonable testing means and device.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the invention can realize the electric energy meter metering error test of voltage fluctuation and magnetic field change, solves the defect that the existing electric energy meter metering error test only considers a single factor, and provides certain technical support for further deeply researching the adaptability assessment technology of the actual working condition environment of the electric energy meter, thereby promoting the technical level of the electric energy metering industry, improving and perfecting the metering test detection capability, and having important economic benefit and social benefit.
In order to solve the technical problems, the invention adopts the technical scheme that:
an electric energy metering error evaluation method considering voltage fluctuation and temperature change comprises the following steps:
1) inputting error offset matrixes V corresponding to the electric energy meter to be detected under the conditions of m types of test voltages and n types of magnetic fields, wherein the size of the error offset matrix V is mxn;
2) calculating the standard deviation V of all elements of the error deviation matrix VstdCalculating the standard deviation V of the error deviation matrix V except the middle column after the front specified number of columns and the back specified number of columnsstd1Judgment condition vstd≤aνstd1And b vstdAnd whether S is equal to or less than S is determined, wherein a and b are preset constant coefficients, S is the accuracy level of the detected electric energy meter, if yes, the metering error of the detected electric energy meter under the condition of simultaneous voltage fluctuation and magnetic field change is determined to be qualified, and otherwise, the metering error of the detected electric energy meter under the condition of simultaneous voltage fluctuation and magnetic field change is determined to be unqualified.
Optionally, step 1) is followed by: searching the maximum value V of all elements in the error offset matrix VPartial maxAnd a minimum value vPartial minThe deviation range [ v ] of the metering error of the electric energy meter to be detected under the condition of the simultaneous change of the output voltage fluctuation and the magnetic fieldPartial max,νPartial min]。
Optionally, the condition v in step 2)std≤aνstd1And b vstdAnd the value of a preset constant coefficient a less than or equal to S is 3, and the value of b is 10.
Optionally, before step 1), a step of obtaining an error offset matrix V corresponding to the electric energy meter to be tested under m types of test voltage magnitudes and n types of magnetic field magnitudes is further included:
s1) controlling the output current of the power source to be the rated current value of the electric energy meter to be detected, the output voltage to be the rated voltage value of the electric energy meter to be detected, the output of the magnetic field generator to be 0mT, and obtaining the electric energy value E of the electric energy meter to be detected under the working conditionIs measuredAnd the electric energy value E of the standard electric energy meterStandard of meritAccording to the electric energy value E of the detected electric energy meterIs measuredAnd the electric energy value E of the standard electric energy meterStandard of meritCalculating to obtain the basic error v of the detected electric energy meterBasic；
S2) controlling the output current of the power source to be the rated current value of the detected electric energy meter, and setting the minimum and maximum output values of the output voltage as the rated voltage value U of the detected electric energy meternomThe preset lower limit multiple is less than 1, the preset upper limit multiple is greater than 1, the variation rule of the output voltage is that the specified multiple of the rated voltage value is taken as the step length to form m types of test voltage sizes, and the rated voltage value U is obtained at intervals of T minutesnomCycling from the preset lower limit to the preset upper limit; meanwhile, the output of the magnetic field generator in the detection environment of the detected electric energy meter is controlled to be set to be circularly changed within a preset size range according to a specified change step length so as to form n types of magnetic field sizes, and the change interval cT is minutes, wherein the interval T is the time required by the rotation of the rotary controllable platform, which is prevented by the detected electric energy meter, for one circle, and c is a constant coefficient; based on the setting, the metering error v of the electric energy meter to be detected under the conditions of m test voltages, any one test voltage under n magnetic fields and one magnetic field is respectively tested1iAnd the metering error v within the interval T time is taken1iAs a result v1According to the basic error v of the detected electric energy meterBasicAnd a result v1Calculating an error offset vDeflectionTo obtain m × n error offsets vDeflectionAnd m × n pieces ofError offset vDeflectionAn error offset matrix V of size m × n is established.
Optionally, the basic error v of the electric energy meter detected in the step S1)BasicThe formula of the calculation function is:
νbasic＝(EIs measured-EStandard of merit)/EStandard of merit×100％
In the above formula, EIs measuredFor the value of the electric energy meter to be tested, EStandard of meritThe electric energy value of a standard electric energy meter is obtained.
Optionally, in step S2), the measurement error v of the electric energy meter to be tested under any one of the test voltages and one of the magnetic fields is measured1iThe formula of the calculation function is:
ν1i＝(E1i-E1i)/E1i×100％
in the above formula, E1iFor the value of the electric energy meter to be tested at the test voltage and the magnitude of the magnetic field, E1iThe electric energy value of the standard electric energy meter under the test voltage and the magnetic field is obtained.
Optionally, v is determined according to the result in step S2)1Calculating an error offset vDeflectionThe formula of the calculation function is:
νdeflection＝|ν1-νBasic|
In the above formula, v1Metering error v for detected electric energy meter within interval T time1iThe result of the calculation of the average value of (v)BasicIs the basic error of the detected electric energy meter.
In addition, the present invention also provides an electric energy metering error evaluation device taking voltage fluctuation and temperature variation into account, including: the electric energy metering error assessment method comprises a power source, a standard meter, a magnetic shielding room, a magnetic field generator and an error calculation unit, wherein the output end of the power source is respectively connected with the standard meter and a detected electric energy meter on a controllable rotating platform in the magnetic shielding room, the output ends of the standard meter and the detected electric energy meter are connected with the input end of the error calculation unit, the magnetic field generator is installed in the magnetic shielding room, and the error calculation unit is programmed or configured to execute the steps of the electric energy metering error assessment method considering voltage fluctuation and temperature change.
In addition, the invention also provides an electric energy metering error evaluation device taking voltage fluctuation and temperature change into account, which comprises a microprocessor and a memory which are connected with each other, wherein the microprocessor is programmed or configured to execute the steps of the electric energy metering error evaluation method taking voltage fluctuation and temperature change into account.
Furthermore, the present invention also provides a computer-readable storage medium having stored therein a computer program programmed or configured to execute the method of evaluating an electric energy metering error taking into account voltage fluctuations and temperature variations.
Compared with the prior art, the invention has the following advantages: the method comprises the steps of calculating the standard deviation V of all elements of an error deviation matrix V aiming at the error deviation matrix V corresponding to the electric energy meter to be detected under the m types of test voltage and the n types of magnetic fieldstdCalculating the standard deviation V of the error deviation matrix V except the middle column after the front specified number of columns and the back specified number of columnsstd1Judgment condition vstd≤aνstd1And b vstdAnd whether S is equal to or less than S is determined, if yes, the metering error of the detected electric energy meter under the condition of simultaneous change of voltage fluctuation and magnetic field is determined to be qualified, otherwise, the metering error of the detected electric energy meter under the condition of simultaneous change of voltage fluctuation and magnetic field is determined to be unqualified. The invention can realize the electric energy meter metering error test of voltage fluctuation and magnetic field change, overcomes the defect that the existing electric energy meter metering error test only considers a single factor, and provides certain technical support for further deeply researching the adaptability assessment technology of the actual working condition environment of the electric energy meter, thereby promoting the technical level of the electric energy metering industry, promoting and perfecting the metering test detection capability, and having important economic benefit and social benefit.
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FIG. 1 is a schematic diagram of a basic flow of a method according to an embodiment of the present invention.
FIG. 2 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, the method for evaluating an electric energy metering error in the present embodiment, which takes voltage fluctuation and temperature variation into account, includes:
1) inputting error offset matrixes V corresponding to the electric energy meter to be detected under the conditions of m types of test voltages and n types of magnetic fields, wherein the size of the error offset matrix V is mxn;
2) calculating the standard deviation V of all elements of the error deviation matrix VstdCalculating the standard deviation V of the error deviation matrix V except the middle column after the front specified number of columns and the back specified number of columnsstd1Judgment condition vstd≤aνstd1And b vstdAnd whether S is equal to or less than S is determined, wherein a and b are preset constant coefficients, S is the accuracy level of the detected electric energy meter, if yes, the metering error of the detected electric energy meter under the condition of simultaneous voltage fluctuation and magnetic field change is determined to be qualified, and otherwise, the metering error of the detected electric energy meter under the condition of simultaneous voltage fluctuation and magnetic field change is determined to be unqualified.
In this embodiment, step 1) further includes: searching the maximum value V of all elements in the error offset matrix VPartial maxAnd a minimum value vPartial minThe deviation range [ v ] of the metering error of the electric energy meter to be detected under the condition of the simultaneous change of the output voltage fluctuation and the magnetic fieldPartial max,νPartial min]。
Considering that the accuracy level of the standard electric energy meter is higher than the accuracy level S of the detected electric energy meter by at least 1 level, in the embodiment, the condition v in the step 2)std≤aνstd1And b vstdAnd the value of a preset constant coefficient a less than or equal to S is 3, and the value of b is 10.
In this embodiment, before step 1), the method further includes a step of obtaining an error offset matrix V corresponding to the electric energy meter to be tested under m types of test voltages and n types of magnetic fields:
s1) controlling the output current of the power source to be the rated current value of the electric energy meter to be detected, the output voltage to be the rated voltage value of the electric energy meter to be detected, the output of the magnetic field generator to be 0mT, and obtaining the electric energy value E of the electric energy meter to be detected under the working conditionIs measuredAnd the electric energy value E of the standard electric energy meterStandard of meritAccording to the electric energy value E of the detected electric energy meterIs measuredAnd standardElectric energy value E of electric energy meterStandard of meritCalculating to obtain the basic error v of the detected electric energy meterBasic；
S2) controlling the output current of the power source to be the rated current value of the detected electric energy meter, and setting the minimum and maximum output values of the output voltage as the rated voltage value U of the detected electric energy meternomThe preset lower limit multiple is less than 1, the preset upper limit multiple is greater than 1, the variation rule of the output voltage is that the specified multiple of the rated voltage value is taken as the step length to form m types of test voltage sizes, and the rated voltage value U is obtained at intervals of T minutesnomCycling from the preset lower limit to the preset upper limit; meanwhile, the output of the magnetic field generator in the detection environment of the detected electric energy meter is controlled to be set to be circularly changed within a preset size range according to a specified change step length so as to form n types of magnetic field sizes, and the change interval cT is minutes, wherein the interval T is the time required by the rotation of the rotary controllable platform, which is prevented by the detected electric energy meter, for one circle, and c is a constant coefficient; based on the setting, the metering error v of the electric energy meter to be detected under the conditions of m test voltages, any one test voltage under n magnetic fields and one magnetic field is respectively tested1iAnd the metering error v within the interval T time is taken1iAs a result v1According to the basic error v of the detected electric energy meterBasicAnd a result v1Calculating an error offset vDeflectionTo obtain m × n error offsets vDeflectionAnd shifting m × n errors by vDeflectionAn error offset matrix V of size m × n is established. Specifically, in the embodiment, the output current of the power source is the rated current value of the detected electric energy meter, and the minimum and maximum output values of the output voltage are set as the rated voltage value U of the detected electric energy meternom0.9 times and 1.1 times, the change rule of the output voltage: the step length is 0.05 times of rated voltage value, the cycle is from 0.9 times of rated voltage value to 1.1 times of rated voltage value at intervals of T minutes, namely [0.9U ]nom,0.95Unom,Unom,1.05Unom,1.05Unom,1.1Unom]Wherein the interval T is the time required by one rotation of the rotary table body matched with the magnetic field generator; the output of the magnetic field generator is set asCyclically varying from 0.4mT to 0.6mT, with a step size of 0.1mT, at 6T minute intervals. Based on the setting, the metering error v of the electric energy meter to be detected under 6 kinds of test voltage, 3 kinds of magnetic field and 3 kinds of magnetic field is respectively tested1iAnd the metering error v within the interval T time is taken1iAs a result v1According to the basic error v of the detected electric energy meterBasicAnd a result v1Calculating an error offset vDeflectionTo obtain 6 x 3 error offsets vDeflectionAnd shifting 6 x 3 errors by vDeflectionAn error offset matrix V of size 6 x 3 is established.
In this embodiment, the basic error v of the detected electric energy meter in step S1)BasicThe formula of the calculation function is:
νbasic＝(EIs measured-EStandard of merit)/EStandard of merit×100％
In the above formula, EIs measuredFor the value of the electric energy meter to be tested, EStandard of meritThe electric energy value of a standard electric energy meter is obtained.
In this embodiment, the metering error v of the electric energy meter to be detected under any one of the test voltages and the magnetic field in step S2)1iThe formula of the calculation function is:
ν1i＝(E1i-E1i)/E1i×100％
in the above formula, E1iFor the value of the electric energy meter to be tested at the test voltage and the magnitude of the magnetic field, E1iThe electric energy value of the standard electric energy meter under the test voltage and the magnetic field is obtained.
In this embodiment, in step S2), v is calculated according to the result v1Calculating an error offset vDeflectionThe formula of the calculation function is:
νdeflection＝|ν1-νBasic|
In the above formula, v1Metering error v for detected electric energy meter within interval T time1iThe result of the calculation of the average value of (v)BasicIs the basic error of the detected electric energy meter.
As shown in fig. 2, the electric energy metering error evaluation device considering voltage fluctuation and temperature variation in the present embodiment includes a power source 1, a standard meter 2, a magnetic shielding chamber 3, a magnetic field generator 4 and an error calculation unit 5, where output terminals of the power source 1 are respectively connected to the standard meter 2 and a detected electric energy meter on a controllable rotation platform in the magnetic shielding chamber 3, output terminals of the standard meter 2 and the detected electric energy meter are connected to an input terminal of the error calculation unit 5, the magnetic field generator 4 is installed in the magnetic shielding chamber 3, and the error calculation unit 5 is programmed or configured to execute the steps of the electric energy metering error evaluation method considering voltage fluctuation and temperature variation in the present embodiment. Referring to fig. 2, as an alternative implementation, the embodiment further includes a data collector 6 and a computer 7, and the output ends of the standard table 2 and the error calculation unit 5 are connected to the computer 7 through the data collector 6. In addition, bus communication is adopted between the standard table 2 and the error calculation unit 5, the data collector 6 is mounted on the bus, and bus communication is adopted between the data collector 6 and the computer 7. Buses include, but are not limited to, CAN bus, RS485, ethernet, fiber optic. The error calculation unit 5 includes, but is not limited to, a pulse signal processing module using a dedicated pulse counting device with a microprocessor or a general electric energy meter calibration device. In addition, the evaluation device of the embodiment further comprises a teslameter, specifically a CH-1600 type teslameter, for monitoring the magnetic field intensity generated by the magnetic field generator 4, so as to ensure the magnetic field intensity to be accurate and reliable.
Referring to fig. 2, as an optional implementation manner, the electric energy metering error evaluation apparatus for measuring voltage fluctuation and temperature variation in the embodiment includes n error calculation units 5 (error calculation unit #1 to error calculation unit # n), which can be used to implement concurrent tests on n detected electric energy meters (detected electric energy meter #1 to detected electric energy meter # n), and can significantly improve test efficiency.
In this embodiment, the electric energy meter to be tested is a class 1 electric energy meter produced by the Hunan Weisheng group, and has a nominal voltage value Unom of 220V, a nominal frequency value fnom of 50Hz, and a current specification of 15A. The power source 1 adopts a star wound STR3060A1 three-phase alternating current standard source, and the voltage regulation range is as follows: (0-120)% RG, fineness adjustment: 0.01% RG, accuracy: 0.1% RG, stability not more than 0.02%/3 min, 20VA of each phase of output power, full load regulation rate of 0.05% RG, and distortion degree not more than 0.2% (non-capacitive load). Standard Table 2 adopts GY3050 model three-phase multifunctional standard table, and the accuracy grade is 0.05 grade. The magnetic field generator 4 adopts PFMF-4108G/AC/DC magnetic field generator. The magnetic shielding room 3 is used for preventing external magnetic field interference, and the controllable rotary platform in the magnetic shielding room 3 is a high-precision rotary controllable platform 42BYG250A, and is set at an interval of T10 minutes. The error calculation unit 5 is developed by adopting a 32-bit ARM chip STM32F103VBT6 of ST company, the main frequency of the chip is 72MHz, the internal resource is rich, 128k bytes FLASH and 20k bytes SRAM are provided, 9 communication interfaces and 7 timers are provided, and each timer has 4 channels for inputting and capturing/outputting comparison/PWM or pulse counting. The data acquisition unit 6 adopts a data acquisition module of a three-phase electric energy meter verification platform produced by sea salt Zhuopu. The computer 7 adopts a Daire (DELL) Lingye 3501 notebook computer with a CPU of i5-1135G 7. The electric energy meter to be detected is arranged in the output space of the PFMF-4108G/AC/DC magnetic field generator after being arranged on the high-precision rotary controllable platform 42BYG 250A; the voltage and current output ends of the power source 1 are connected with the standard meter 2 and the detected electric energy meter; the electric energy pulses output by the detected electric energy meter and the standard meter 2 are connected to the error calculation unit 5; the error calculation unit 5 respectively sends the electric energy metering errors of the electric energy meter to be detected and the standard electric energy meter under the voltage fluctuation and the magnetic field change to the computer to finish the basic error evaluation of the electric energy meter. The specific test data results are as follows:
the power source 1 outputs current of 15A, 220V and 0mT, records the basic error V of the electric energy meterBasic＝0.024％；
The output current of the power source is the rated current value 15A of the electric energy meter to be detected, and the minimum and maximum output values of the output voltage are set as the rated voltage value U of the electric energy meter to be detectednom0.9 times and 1.1 times, the change rule of the output voltage: taking 0.05 times of rated voltage value as a step length, and circulating from 0.9 times of rated voltage value to 1.1 times of rated voltage value at intervals of 10 minutes; magnetic fieldThe output of the field generator is set to be cyclically changed from 0.4mT to 0.6mT, the change step size is 0.1mT, and the change interval is 60 minutes; recording a metering error offset matrix vDeflectionAs shown in table 1:
| -0.0035％ | -0.0024％ | 0.0019％ | 0.0018％ | -0.0021％ | -0.0032％ |
| 0.0024％ | 0.0022％ | 0.0019％ | 0.0020％ | 0.0019％ | 0.0014％ |
| 0.0030％ | -0.0023％ | -0.0021％ | -0.0014％ | 0.0018％ | -0.0011％ |
v is obtained by analysisPartial max＝0.0030％，νPartial minThe deviation range of the metering error of the electric energy meter to be detected under the condition of simultaneous variation of voltage fluctuation and magnetic field is-0.0035% and 0.0030%]；νDeflectionStandard deviation of all elements is vstdIs 2.27688E-05, vDeflectionThe standard deviation of the elements of the second, third, fourth and fifth columns is nustd12.06984E-05, satisfies νstd≤3νstd1And 10 νstdAnd (4) less than or equal to 1, the metering error of the detected electric energy meter under the condition of simultaneous change of voltage fluctuation and magnetic field can be evaluated to be not out of tolerance.
In summary, the actual operation of the electric energy meter is often influenced by a plurality of factors including voltage fluctuation and magnetic field change, and the invention provides a basis for improving the fairness and reasonableness of electric energy metering by completing the basic error test of the electric energy meter considering the voltage fluctuation and the magnetic field change simultaneously. The invention can realize the electric energy meter metering error test of voltage fluctuation and magnetic field change, overcomes the defect that the existing electric energy meter metering error test only considers a single factor, and provides certain technical support for further deeply researching the adaptability assessment technology of the actual working condition environment of the electric energy meter, thereby promoting the technical level of the electric energy metering industry, promoting and perfecting the metering test detection capability, and having important economic benefit and social benefit.
In addition, the present embodiment also provides an electric energy metering error evaluation device taking voltage fluctuation and temperature variation into account, which includes a microprocessor and a memory connected to each other, wherein the microprocessor is programmed or configured to execute the steps of the electric energy metering error evaluation method taking voltage fluctuation and temperature variation into account.
Further, the present embodiment also provides a computer-readable storage medium having stored therein a computer program programmed or configured to execute the aforementioned electric energy metering error evaluation method taking into account voltage fluctuations and temperature variations.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-readable 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 application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. 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 apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus 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 apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. An electric energy metering error evaluation method considering voltage fluctuation and temperature change is characterized by comprising the following steps:
1) inputting error offset matrixes V corresponding to the electric energy meter to be detected under the conditions of m types of test voltages and n types of magnetic fields, wherein the size of the error offset matrix V is mxn;
2) calculating the standard deviation V of all elements of the error deviation matrix VstdCalculating the standard deviation V of the error deviation matrix V except the middle column after the front specified number of columns and the back specified number of columnsstd1Judgment condition vstd≤aνstd1And b vstdAnd whether S is equal to or less than S is determined, wherein a and b are preset constant coefficients, S is the accuracy level of the detected electric energy meter, if yes, the metering error of the detected electric energy meter under the condition of simultaneous voltage fluctuation and magnetic field change is determined to be qualified, and otherwise, the metering error of the detected electric energy meter under the condition of simultaneous voltage fluctuation and magnetic field change is determined to be unqualified.
2. The method for evaluating the error of the electric energy metering according to claim 1, wherein the step 1) is followed by further comprising: searching the maximum value V of all elements in the error offset matrix VPartial maxAnd a minimum value vPartial minThe deviation range [ v ] of the metering error of the electric energy meter to be detected under the condition of the simultaneous change of the output voltage fluctuation and the magnetic fieldPartial max,νPartial min]。
3. The method of claim 1, wherein the condition v in step 2) is a condition vstd≤aνstd1And b vstdAnd the value of a preset constant coefficient a less than or equal to S is 3, and the value of b is 10.
4. The method for evaluating the error of the electric energy metering considering the voltage fluctuation and the temperature change according to claim 1, wherein the method further comprises a step of obtaining an error offset matrix V corresponding to the electric energy meter to be tested under m types of test voltage magnitudes and n types of magnetic field magnitudes before the step 1):
s1) controlling the output current of the power source to be the rated current value of the electric energy meter to be detected, the output voltage to be the rated voltage value of the electric energy meter to be detected, the output of the magnetic field generator to be 0mT, and obtaining the electric energy value E of the electric energy meter to be detected under the working conditionIs measuredAnd the electric energy value E of the standard electric energy meterStandard of meritAccording to the electric energy value E of the detected electric energy meterIs measuredAnd the electric energy value E of the standard electric energy meterStandard of meritCalculating to obtain the basic error v of the detected electric energy meterBasic；
S2) controlling the output current of the power source to be the rated current value of the detected electric energy meter, and setting the minimum and maximum output values of the output voltage as the rated voltage value U of the detected electric energy meternomThe preset lower limit multiple is less than 1, the preset upper limit multiple is greater than 1, the variation rule of the output voltage is that the specified multiple of the rated voltage value is taken as the step length to form m types of test voltage sizes, and the rated voltage value U is obtained at intervals of T minutesnomCycling from the preset lower limit to the preset upper limit; meanwhile, the output of the magnetic field generator in the detection environment of the detected electric energy meter is controlled to be set to be circularly changed within a preset size range according to a specified change step length so as to form n types of magnetic field sizes, and the change interval cT is minutes, wherein the interval T is the time required by the rotation of the rotary controllable platform, which is prevented by the detected electric energy meter, for one circle, and c is a constant coefficient; based on the setting, the metering error v of the electric energy meter to be detected under the conditions of m test voltages, any one test voltage under n magnetic fields and one magnetic field is respectively tested1iAnd the metering error v within the interval T time is taken1iAs a result v1According to the basic error v of the detected electric energy meterBasicAnd a result v1Calculating an error offset vDeflectionTo obtain m × n error offsets vDeflectionAnd shifting m × n errors by vDeflectionAn error offset matrix V of size m × n is established.
5. The method for evaluating errors in electric energy metering according to claim 4, wherein the basic error v of the electric energy meter detected in step S1)BasicThe formula of the calculation function is:
νbasic＝(EIs measured-EStandard of merit)/EStandard of merit×100％
In the above formula, EIs measuredFor the value of the electric energy meter to be tested, EStandard of meritThe electric energy value of a standard electric energy meter is obtained.
6. The method as claimed in claim 4, wherein the step S2) includes measuring the error v of the electric energy meter under a certain test voltage and a certain magnetic field1iThe formula of the calculation function is:
ν1i＝(E1i-E1i)/E1i×100％
in the above formula, E1iFor the value of the electric energy meter to be tested at the test voltage and the magnitude of the magnetic field, E1iThe electric energy value of the standard electric energy meter under the test voltage and the magnetic field is obtained.
7. The method of claim 4, wherein the step S2) comprises evaluating the error of the electric energy meter according to the result v1Calculating an error offset vDeflectionThe formula of the calculation function is:
νdeflection＝|ν1-νBasic|
In the above formula, v1Metering error v for detected electric energy meter within interval T time1iThe result of the calculation of the average value of (v)BasicIs the basic error of the detected electric energy meter.
8. An electric energy measurement error evaluation device that takes voltage fluctuation and temperature variation into account, comprising: the method comprises a power source (1), a standard meter (2), a magnetic shielding room (3), a magnetic field generator (4) and an error calculation unit (5), wherein the output end of the power source (1) is respectively connected with the standard meter (2) and a detected electric energy meter on a controllable rotating platform in the magnetic shielding room (3), the output ends of the standard meter (2) and the detected electric energy meter are connected with the input end of the error calculation unit (5), the magnetic field generator (4) is installed in the magnetic shielding room (3), and the error calculation unit (5) is programmed or configured to execute the steps of the electric energy metering error evaluation method considering voltage fluctuation and temperature change in any one of claims 1 to 7.
9. An electrical energy metering error assessment device taking voltage fluctuation and temperature variation into account, comprising a microprocessor and a memory connected with each other, characterized in that the microprocessor is programmed or configured to execute the steps of the electrical energy metering error assessment method taking voltage fluctuation and temperature variation into account of any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored therein a computer program programmed or configured to execute the method of estimating an error in electric energy metering taking into account voltage fluctuations and temperature variations of any one of claims 1 to 7.
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