CN119861329A - Electric energy meter error detection method and system based on energy conservation principle - Google Patents
Electric energy meter error detection method and system based on energy conservation principle Download PDFInfo
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Abstract
本发明提供一种基于能量守恒原理的电能表误差检测方法和系统，其中，所述方法包括以下步骤：获取每天不同时段的表箱中的电能表计量的用户用电数据，用户用电数据包括表箱进线计量侧计量的电量和电能表计量的电量；构建电能表计量误差计算模型，将用户用电数据输入至电能表计量误差计算模型中，以对每个电能表的计量误差进行计算；通过将计算结果和电能表的误差标定值进行比较来判断电能表的计量误差是否超标。本发明能够在不需要停电和不额外加装标准装置的情况下对电能表进行计量误差检测，且显著降低了对电能表的运行和维护成本。
The present invention provides an electric energy meter error detection method and system based on the energy conservation principle, wherein the method comprises the following steps: obtaining user electricity consumption data measured by the electric energy meter in the meter box at different time periods every day, wherein the user electricity consumption data includes the electricity measured by the incoming line metering side of the meter box and the electricity measured by the electric energy meter; constructing an electric energy meter measurement error calculation model, inputting the user electricity consumption data into the electric energy meter measurement error calculation model to calculate the measurement error of each electric energy meter; and comparing the calculation result with the error calibration value of the electric energy meter to determine whether the measurement error of the electric energy meter exceeds the standard. The present invention can detect the measurement error of the electric energy meter without power outage and without additional installation of standard devices, and significantly reduces the operation and maintenance costs of the electric energy meter.
Description
Technical Field
The invention relates to the technical field of electric quantity metering detection, in particular to an electric energy meter error detection method and system based on an energy conservation principle.
Background
The electric energy has the characteristics of high efficiency, cleaning, convenience and the like, and becomes one of the main energy sources in the modern society. The electric energy meter is an important basis for carrying out distribution electricity management and power supply settlement on the power grid, and whether the running state is stable and reliable is directly related to the vital interests of a user, so that the measurement error detection of the electric energy meter is an important task, and is also an essential link for ensuring the normal running of the metering function of the electric energy meter and the maintenance of a metering system.
At present, the main mode for checking whether the metering error of the electric energy meter is normal is to carry checking instrument equipment to the site for checking by a professional, and the method has low efficiency and high cost and can not provide scientific and reliable basis for electric energy meter rotation.
In order to solve the above problems, for example, chinese patent publication No. CN114152808B discloses a smart meter with error self-checking function and a checking method thereof, the method includes connecting a measurement standard device in series between a power line of a first outlet port in the smart meter and a power consumer on a corresponding power line; the intelligent ammeter reads the electric energy data of the measurement standard device, and when the electric energy data uploaded by the measurement standard device arranged at the first outlet port is confirmed to be matched with the electric energy data of the first outlet measurement sensor corresponding to the first outlet port, the measurement error calculation of the inlet measurement sensor and the outlet measurement sensor is carried out according to the electric energy data of the inlet measurement sensor and the outlet measurement sensor which belong to the same time with the matched electric energy data. Although the error checking of the intelligent ammeter is realized, equipment such as a metering standard device is added in an inlet circuit and an outlet circuit of the ammeter, the method has the problems of large workload, low efficiency and overhigh cost of field installation operation, and when the error checking of a plurality of electric energy meters in the meter box is required, the operation space for installing the metering standard device is limited.
Disclosure of Invention
The invention aims to solve the technical problems, and provides an electric energy meter error detection method and system based on an energy conservation principle, which can detect metering errors of an electric energy meter under the condition that power failure is not needed and a standard device is not additionally arranged, and remarkably reduce the operation and maintenance cost of the electric energy meter.
The technical scheme adopted by the invention is as follows:
The electric energy meter error detection method based on the energy conservation principle comprises the following steps of obtaining user electricity consumption data measured by electric energy meters in meter boxes at different time intervals every day, wherein the user electricity consumption data comprise electric quantity measured by an incoming line measuring side of the meter boxes and electric quantity measured by the electric energy meters, constructing an electric energy meter measuring error calculation model, inputting the user electricity consumption data into the electric energy meter measuring error calculation model to calculate measuring errors of each electric energy meter, and judging whether the measuring errors of the electric energy meters exceed standards or not by comparing calculation results with error calibration values of the electric energy meters.
In one embodiment of the present invention, the calculation formula of the electric quantity measured by the meter box inlet wire metering side is:
Wherein M 0 is the electric quantity measured by the meter box incoming line measuring switch, M i is the actual electric quantity of the electric energy meter, alpha i is the measuring error of the electric energy meter, n is the number of the electric energy meter, and i is a positive integer.
In one embodiment of the present invention, the user electricity data is input into the electric energy meter metering error calculation model to calculate the metering error of each electric energy meter, and specifically includes:
calculating the consumption m 0 of the electricity consumption of the electric energy meter;
Constructing a multiple energy conservation formula, and calculating the electricity consumption per hour in one day, wherein the electricity consumption per hour is expressed as follows:
For a pair of Solving the value of (1) to make
Wherein A is an electric quantity matrix measured in one day of the electric energy meter;
construction of the connection Is an overdetermined system of equations:
The solution of the system of overdetermined equations is:
wherein A T is the transposed matrix of A;
According to Alpha i is calculated from the value of (a);
if the metering error alpha i of the electric energy meter exceeds the accuracy grade of the nameplate of the electric energy meter, the electric energy meter out-of-tolerance electric meter is marked.
In one embodiment of the invention, the electric energy meter comprises a single-phase electric energy meter, a three-phase electric energy meter and an intelligent electric energy meter, wherein the accuracy requirement of metering at the wire inlet metering side of the meter box is 0.5%, and if the electric energy meter occupies 1/4 of the electric quantity at the wire inlet metering side of the meter box in a part of operation time period, the accuracy of metering error of the electric energy meter is 2%, and the accuracy is consistent with the allowable deviation of the technical specification of the single-phase electric energy meter.
In one embodiment of the invention, the running time of the electricity consumption meets the condition that the degree error of the electricity consumption measured by the incoming line measuring side of the meter box is not larger than the measuring error.
The electric energy meter error detection system based on the energy conservation principle comprises an acquisition module and a judging module, wherein the acquisition module is used for acquiring user electricity consumption data of electric energy meter metering in meter boxes at different time intervals every day, the user electricity consumption data comprise electric quantity metered by a meter box inlet wire metering side and electric quantity metered by the electric energy meter, the calculating module is used for constructing an electric energy meter metering error calculating model, inputting the user electricity consumption data into the electric energy meter metering error calculating model to calculate metering errors of each electric energy meter, and the judging module is used for judging whether the metering errors of the electric energy meter exceed standards or not by comparing calculation results with error calibration values of the electric energy meter.
In one embodiment of the present invention, the calculation formula of the electric quantity measured by the meter box inlet wire metering side is:
Wherein M 0 is the electric quantity measured by the meter box incoming line measuring switch, M i is the actual electric quantity of the electric energy meter, alpha i is the measuring error of the electric energy meter, n is the number of the electric energy meter, and i is a positive integer.
In one embodiment of the present invention, the computing module is specifically configured to:
calculating the consumption m 0 of the electricity consumption of the electric energy meter;
Constructing a multiple energy conservation formula, and calculating the electricity consumption per hour in one day, wherein the electricity consumption per hour is expressed as follows:
For a pair of Solving the value of (1) to make
Wherein A is an electric quantity matrix measured in one day of the electric energy meter;
construction of the connection Is an overdetermined system of equations:
The solution of the system of overdetermined equations is:
wherein A T is the transposed matrix of A;
According to Alpha i is calculated from the value of (a);
if the metering error alpha i of the electric energy meter exceeds the accuracy grade of the nameplate of the electric energy meter, the electric energy meter out-of-tolerance electric meter is marked.
In one embodiment of the invention, the electric energy meter comprises a single-phase electric energy meter, a three-phase electric energy meter and an intelligent electric energy meter, wherein the accuracy requirement of metering at the wire inlet metering side of the meter box is 0.5%, and if the electric energy meter occupies 1/4 of the electric quantity at the wire inlet metering side of the meter box in a part of operation time period, the accuracy of metering error of the electric energy meter is 2%, and the accuracy is consistent with the allowable deviation of the technical specification of the single-phase electric energy meter.
In one embodiment of the invention, the running time of the electricity consumption meets the condition that the degree error of the electricity consumption measured by the incoming line measuring side of the meter box is not larger than the measuring error.
In operation, user electricity consumption data measured by the electric energy meters in meter boxes at different time intervals every day are obtained, an electric energy meter measurement error calculation model is built, the user electricity consumption data are input into the electric energy meter measurement error calculation model to calculate the measurement error of each electric energy meter, and then whether the measurement error of the electric energy meter exceeds the standard is judged by comparing the calculation result with an error calibration value of the electric energy meter, so that the electric energy meter can be subjected to measurement error detection under the condition that a standard device is not required to be additionally arranged in the power failure, and the operation and maintenance cost of the electric energy meter is remarkably reduced.
Drawings
FIG. 1 is a flow chart of an energy conservation principle-based electric energy meter error detection method according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a power grid topology according to one embodiment of the present invention;
fig. 3 is a block diagram of an error detection system of an electric energy meter based on the principle of conservation of energy according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a flowchart of an electric energy meter error detection method based on the principle of conservation of energy according to an embodiment of the present invention.
As shown in fig. 1, the method for detecting the error of the electric energy meter based on the principle of conservation of energy according to the embodiment of the invention comprises the following steps:
S1, acquiring user electricity consumption data metered by the electric energy meter in meter boxes at different time intervals every day, wherein the user electricity consumption data comprise electric quantity metered by the meter box inlet wire metering side and electric quantity metered by the electric energy meter (namely actual electric quantity of the electric energy meter).
S2, constructing an electric energy meter metering error calculation model, and inputting user electricity data into the electric energy meter metering error calculation model so as to calculate the metering error of each electric energy meter.
And S3, judging whether the metering error of the electric energy meter exceeds the standard or not by comparing the calculation result with the error calibration value of the electric energy meter.
Specifically, as shown in fig. 2, in the topology structure of the power grid, the range defined by the dashed circle S is a power balance system, and the total power input theoretically is the sum of the power input by all the electric energy meters (i.e., energy conservation), so that the electric energy metering error of the electric energy meters can be calculated online by acquiring the power change metered by the user electric energy meters in the daily power supply process.
The metering error of the electric energy meter can be set to be alpha i, and the actual metering electric quantity of the reduction electric energy meter isThe electric quantity measured by the meter box incoming line measuring side is as follows:
Wherein, M 0 is the electric quantity measured by the meter box incoming line measuring switch, M i is the actual electric quantity of the electric energy meter (for example, the electric power company can remotely acquire and transmit the electric quantity data of each user to the electric power company every 15 minutes through a remote meter reading system), alpha i is the measuring error of the electric energy meter, n is the number of the electric energy meter, and i is a positive integer.
Further, considering the self-electricity consumption m 0 of the electric energy meter in the actual meter box, according to the technical specification and the actual operation test of the intelligent electric energy meter, the self-electricity consumption of the single-phase electric energy meter can take 1.25 watts, the self-electricity consumption of the three-phase electric energy meter can take 2.5 watts, the self-electricity consumption of the intelligent electric energy meter with the built-in carrier module can take 2.5 watts, and the electric energy loss caused by the circuit impedance in the meter box can be ignored. With the ammeter case as the object, can obtain according to the electric quantity M 0 that the inlet wire measurement side of table case measured:
Wherein m 0 is the consumption of the electricity consumption of the electric energy meter, and T is the operation time of the electric energy meter for measuring the electric quantity.
Because the electricity consumption habits of different electricity consumers are different, the electricity consumption per day is different, and the electricity consumption in different time periods within a day is greatly changed, multiple energy conservation formulas can be constructed according to the electricity consumption characteristics of users measured in different time periods, and the electricity consumption per hour within a day is calculated, wherein the electricity consumption per hour expression is as follows:
For a pair of The value of (i.e. the calculated intermediate coefficient, the coefficient for obtaining the restored electric quantity taking the ammeter error into account) is solved for
Wherein A is an electric quantity matrix of the electric energy meter measured in one day.
Construction of the connectionIs an overdetermined system of equations:
The solution of the system of overdetermined equations is:
wherein A T is the transposed matrix of A. j is a positive integer representing the number of data sets, e.g., one set of data per hour per day, j=24.
In practical engineering practice, it is necessary to ensure that j groups M i have enough electricity consumption values and have small correlation, and more than n M i data groups can be obtained through electricity consumption behavior changes of holidays, weekends and weekdays to ensure thatThe values converge.
Finally, it can be according toIf the metering error alpha i of the electric energy meter exceeds the accuracy grade of the nameplate of the electric energy meter, marking the electric energy meter out-of-tolerance ammeter, and recommending the electric energy meter to be rotated.
In one embodiment of the invention, the electric energy meter comprises a single-phase electric energy meter, a three-phase electric energy meter and an intelligent electric energy meter, wherein the accuracy requirement of metering at the metering side of the inlet wire of the meter box is 0.5%, and if the electric energy meter occupies 1/4 of the electric quantity at the metering side of the inlet wire of the meter box in a part of the operation time period, the accuracy of metering error of the electric energy meter is 2%, and the metering error is consistent with the allowable deviation of the technical specification of the single-phase electric energy meter.
In S1, data of each hour is acquired, and if the electricity consumption of the user is small and the electricity consumption data of each hour is basically unchanged, the accumulated time period must be increased. That is, the electricity consumption data obtained in the step S1 is changed for each group, and can be substituted into the S2 calculation and analysis.
In one embodiment of the invention, the running time of the electricity consumption meets the requirement that the degree error of the electricity consumption measured on the metering side of the incoming line of the meter box is not larger than the metering error.
According to the electric energy meter error detection method based on the energy conservation principle, the user electricity consumption data measured by the electric energy meters in meter boxes at different time intervals every day are obtained, the electric energy meter measurement error calculation model is built, the user electricity consumption data are input into the electric energy meter measurement error calculation model to calculate the measurement error of each electric energy meter, and then whether the measurement error of the electric energy meter exceeds the standard is judged by comparing the calculation result with the error calibration value of the electric energy meter, so that the electric energy meter can be subjected to measurement error detection without power failure and additional standard devices (namely, the electric meter measurement error detector special for an electric power company), and the operation and maintenance cost of the electric energy meter is remarkably reduced.
In order to realize the electric energy meter error detection method based on the energy conservation principle in the embodiment, the invention also provides an electric energy meter error detection system based on the energy conservation principle.
As shown in FIG. 3, the electric energy meter error detection system based on the principle of conservation of energy in the embodiment of the invention comprises an acquisition module 100, a calculation module 200 and a judgment module 300, wherein the acquisition module 100 is used for acquiring user electricity consumption data measured by electric energy meters in meter boxes at different time intervals each day, the user electricity consumption data comprises electric quantity measured by a meter box incoming line measuring side and electric quantity measured by the electric energy meters, the calculation module 200 is used for constructing an electric energy meter measuring error calculation model, the user electricity consumption data is input into the electric energy meter measuring error calculation model to calculate measuring errors of each electric energy meter, and the judgment module 300 is used for judging whether the measuring errors of the electric energy meters exceed standards by comparing calculation results with error calibration values of the electric energy meters.
In one embodiment of the present invention, as shown in fig. 2, in the topology structure of the power grid, the range defined by the dashed circle S is a power balance system, and the total power input theoretically is the sum of the power input by all the power meters, so the calculation module 200 can calculate the power metering error of the power meters online by acquiring the power variation metered by the user power meters in the daily power supply process.
The metering error of the electric energy meter can be set to be alpha i, and the actual metering electric quantity of the reduction electric energy meter isThe electric quantity measured by the meter box incoming line measuring side is as follows:
Wherein M 0 is the electric quantity measured by the meter box incoming line measuring switch, M i is the actual electric quantity of the electric energy meter, alpha i is the measuring error of the electric energy meter, n is the number of the electric energy meter, and i is a positive integer.
Further, considering the self-electricity consumption m 0 of the electric energy meter in the actual meter box, according to the technical specification and the actual operation test of the intelligent electric energy meter, the self-electricity consumption of the single-phase electric energy meter can take 1.25 watts, the self-electricity consumption of the three-phase electric energy meter can take 2.5 watts, the self-electricity consumption of the intelligent electric energy meter with the built-in carrier module can take 2.5 watts, and the electric energy loss caused by the circuit impedance in the meter box can be ignored. With the ammeter case as the object, can obtain according to the electric quantity M 0 that the inlet wire measurement side of table case measured:
Wherein m 0 is the consumption of the electricity consumption of the electric energy meter, and T is the operation time of the electric energy meter for measuring the electric quantity.
Because the electricity consumption habits of different electricity consumers are different, the electricity consumption per day is different, and the electricity consumption in different time periods within a day is greatly changed, multiple energy conservation formulas can be constructed according to the electricity consumption characteristics of users measured in different time periods, and the electricity consumption per hour within a day is calculated, wherein the electricity consumption per hour expression is as follows:
For a pair of Solving the value of (1) to make
Wherein A is an electric quantity matrix of the electric energy meter measured in one day.
Construction of the connectionIs an overdetermined system of equations:
The solution of the system of overdetermined equations is:
wherein A T is the transposed matrix of A. j is a positive integer representing the number of data sets, e.g., one set of data per hour per day, j=24.
In practical engineering practice, it is necessary to ensure that j groups M i have enough electricity consumption values and have small correlation, and more than n M i data groups can be obtained through electricity consumption behavior changes of holidays, weekends and weekdays to ensure thatThe values converge.
Finally, it can be according toAnd judges whether the electric energy meter needs to be rotated or not through the judging module 300, if the metering error alpha i of the electric energy meter exceeds the accuracy grade of the nameplate of the electric energy meter, the electric energy meter out-of-tolerance ammeter is marked, and the electric energy meter is recommended to be rotated.
In one embodiment of the invention, the electric energy meter comprises a single-phase electric energy meter, a three-phase electric energy meter and an intelligent electric energy meter, wherein the accuracy requirement of metering at the metering side of the inlet wire of the meter box is 0.5%, and if the electric energy meter occupies 1/4 of the electric quantity at the metering side of the inlet wire of the meter box in a part of the operation time period, the accuracy of metering error of the electric energy meter is 2%, and the metering error is consistent with the allowable deviation of the technical specification of the single-phase electric energy meter.
In one embodiment of the invention, the running time of the electricity consumption meets the requirement that the degree error of the electricity consumption measured on the metering side of the incoming line of the meter box is not larger than the metering error.
In summary, the acquisition module acquires the user electricity consumption data measured by the electric energy meter in the meter box at different time intervals every day, and constructs an electric energy meter measurement error calculation model, the calculation module inputs the user electricity consumption data into the electric energy meter measurement error calculation model to calculate the measurement error of each electric energy meter, and then the judgment module compares the calculation result with the error calibration value of the electric energy meter to judge whether the measurement error of the electric energy meter exceeds the standard, so that the electric energy meter can be subjected to measurement error detection under the condition that a standard device is not required to be additionally arranged in power failure and not required to be additionally arranged, and the operation and maintenance cost of the electric energy meter is remarkably reduced.
In the description of the present invention, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. The meaning of "a plurality of" is two or more, unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily for the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include an electrical connection (an electronic device) having one or more wires, a portable computer diskette (a magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of techniques known in the art, discrete logic circuits with logic gates for implementing logic functions on data signals, application specific integrated circuits with appropriate combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. An electric energy meter error detection method based on an energy conservation principle is characterized by comprising the following steps:
Acquiring user electricity consumption data metered by an electric energy meter in a meter box at different time intervals every day, wherein the user electricity consumption data comprises electric quantity metered by an inlet wire metering side of the meter box and electric quantity metered by the electric energy meter;
Constructing an electric energy meter metering error calculation model, and inputting the user electricity consumption data into the electric energy meter metering error calculation model so as to calculate the metering error of each electric energy meter;
and comparing the calculation result with an error calibration value of the electric energy meter to judge whether the metering error of the electric energy meter exceeds the standard.
2. The method for detecting the error of the electric energy meter based on the principle of conservation of energy according to claim 1, wherein a calculation formula of the electric quantity measured by the meter box incoming line measuring side is as follows:
Wherein M 0 is the electric quantity measured by the meter box incoming line measuring switch, M i is the actual electric quantity of the electric energy meter, alpha i is the measuring error of the electric energy meter, n is the number of the electric energy meter, and i is a positive integer.
3. The method for detecting an error of an electric energy meter based on the principle of conservation of energy according to claim 2, wherein the step of inputting the user electricity data into the electric energy meter metering error calculation model to calculate the metering error of each electric energy meter specifically comprises:
calculating the consumption m 0 of the electricity consumption of the electric energy meter;
Constructing a multiple energy conservation formula, and calculating the electricity consumption per hour in one day, wherein the electricity consumption per hour is expressed as follows:
For a pair of Solving the value of (1) to make
Wherein A is an electric quantity matrix measured in one day of the electric energy meter;
construction of the connection Is an overdetermined system of equations:
The solution of the system of overdetermined equations is:
wherein A T is the transposed matrix of A;
According to Alpha i is calculated from the value of (a);
if the metering error alpha i of the electric energy meter exceeds the accuracy grade of the nameplate of the electric energy meter, the electric energy meter out-of-tolerance electric meter is marked.
4. The electric energy meter error detection method based on the energy conservation principle according to claim 3, wherein the electric energy meter comprises a single-phase electric energy meter and a three-phase electric energy meter, the accuracy requirement of metering at the meter box inlet wire metering side is 0.5%, and if the electric energy meter occupies 1/4 of the electric quantity at the meter box inlet wire metering side in a part of operation time period, the accuracy of the metering error of the electric energy meter is 2%, and the accuracy is consistent with the allowable deviation of the single-phase electric energy meter technical specification.
5. The method for detecting the error of the electric energy meter based on the principle of conservation of energy according to claim 4, wherein the running time of the electricity consumption meets the condition that the degree error of the electricity consumption measured on the metering side of the incoming line of the meter box is not larger than the metering error.
6. An energy conservation principle-based electric energy meter error detection system, which is characterized by comprising:
the acquisition module is used for acquiring user electricity consumption data measured by the electric energy meter in the meter box at different time intervals every day, wherein the user electricity consumption data comprise electric quantity measured by the meter box incoming line measuring side and electric quantity measured by the electric energy meter;
The calculation module is used for constructing an electric energy meter metering error calculation model, and inputting the user electricity consumption data into the electric energy meter metering error calculation model so as to calculate the metering error of each electric energy meter;
And the judging module is used for judging whether the metering error of the electric energy meter exceeds the standard or not by comparing the calculation result with the error calibration value of the electric energy meter.
7. The energy conservation principle-based electric energy meter error detection system according to claim 6, wherein the calculation formula of the electric quantity measured by the meter box incoming line measuring side is:
Wherein M 0 is the electric quantity measured by the meter box incoming line measuring switch, M i is the actual electric quantity of the electric energy meter, alpha u is the measuring error of the electric energy meter, n is the number of the electric energy meter, and i is a positive integer.
8. The energy conservation principle-based electric energy meter error detection system of claim 7, wherein the computing module is specifically configured to:
calculating the consumption m 0 of the electricity consumption of the electric energy meter;
Constructing a multiple energy conservation formula, and calculating the electricity consumption per hour in one day, wherein the electricity consumption per hour is expressed as follows:
For a pair of Solving the value of (1) to make
Wherein A is an electric quantity matrix measured in one day of the electric energy meter;
construction of the connection Is an overdetermined system of equations:
The solution of the system of overdetermined equations is:
wherein A T is the transposed matrix of A;
According to Alpha i is calculated from the value of (a);
if the metering error alpha i of the electric energy meter exceeds the accuracy grade of the nameplate of the electric energy meter, the electric energy meter out-of-tolerance electric meter is marked.
9. The energy conservation principle-based electric energy meter error detection system according to claim 8, wherein the electric energy meter comprises a single-phase electric energy meter, a three-phase electric energy meter and an intelligent electric energy meter, the accuracy requirement of metering at the meter box inlet wire metering side is 0.5%, wherein if the electric energy meter occupies 1/4 of the electric quantity at the meter box inlet wire metering side in a part of operation time period, the accuracy of the metering error of the electric energy meter is 2%, and the accuracy is consistent with the allowable deviation of the single-phase electric energy meter technical specification.
10. The energy conservation principle-based electric energy meter error detection system according to claim 9, wherein the running time of the electricity consumption satisfies that the electricity degree error of the meter box measured at the incoming line metering side is not greater than the metering error.
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