Electric energy meter error detection method and system based on energy conservation principle

Abstract

The invention provides an energy conservation principle-based electric energy meter error detection method and system, and the method comprises the following steps: obtaining user power consumption data metered by an electric energy meter in a meter box at different time periods every day, the user power consumption data comprising the electric quantity metered by an incoming line metering side of the meter box and the electric quantity metered by the electric energy meter; constructing an electric energy meter metering error calculation model, and inputting the user power 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 a 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 or not. According to the invention, metering error detection can be carried out on the electric energy meter without power failure and additional installation of a standard device, and the operation and maintenance cost of the electric energy meter is significantly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electric quantity measurement detection, and in particular to an electric energy meter error detection method and system based on the energy conservation principle. Background Art

[0002] Electricity has become one of the main energy sources in modern society due to its high efficiency, cleanliness and convenience. The electric energy meter is an important basis for the power grid to manage power distribution and settle power supply. Whether its operating status is stable and reliable is directly related to the vital interests of users. Therefore, the measurement error detection of massive electric energy meters in operation is an important task and an indispensable link in ensuring the normal operation of the metering function and the maintenance of the metering system.

[0003] At present, the main way to verify whether the metering error of the electric energy meter is normal is to have professionals bring calibration instruments and equipment to the site for verification. This method is inefficient and costly, and cannot provide a scientific and reliable basis for meter rotation.

[0004] In order to solve the above problems, a Chinese patent with announcement number CN114152808B discloses a smart meter with error self-checking function and its check method, which includes connecting a metering standard in series between the transmission line of the first outlet port of the smart meter and the electrical equipment on the corresponding transmission line; wherein, a data communication link is established between the metering standard and the smart meter; the smart meter reads the electric energy data of the metering standard, and when it is confirmed that the electric energy data uploaded by the metering standard set at the first outlet port matches the electric energy data of the first outlet metering sensor corresponding to the first outlet port, the metering error of its own incoming metering sensor and outgoing metering sensor is calculated according to the electric energy data of the incoming metering sensor and the outgoing metering sensor belonging to the same time as the matched electric energy data. Although it realizes the error check of the smart meter, it needs to add equipment such as metering standards in the incoming and outgoing circuits of the meter, but this approach brings the following problems: the workload of on-site installation operation is large, the efficiency is low, and the cost is too high; and when it is necessary to perform error check on multiple electric energy meters in the meter box, the operating space for installing the metering standard is limited. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an electric energy meter error detection method and system based on the principle of conservation of energy, which can perform metering error detection on 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.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A method for detecting an error in an electric energy meter based on the principle of conservation of energy comprises the following steps: obtaining user electricity consumption data measured by an electric energy meter in a meter box at different time periods every day, wherein the user electricity consumption data comprises the electricity measured at 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 of the electric energy meters; and judging whether the measurement error of the electric energy meter exceeds the standard by comparing the calculation result with the error calibration value of the electric energy meter.

[0008] In one embodiment of the present invention, the calculation formula for the amount of electricity measured at the incoming line metering side of the meter box is:

[0009]

[0010] Among them, M0 is the power measured by the meter box incoming line measurement switch, M i is the actual power of the energy meter, α i is the measurement error of the electric energy meter, n is the number of electric energy meters, and i is a positive integer.

[0011] In one embodiment of the present invention, the user electricity consumption data is input into the electric energy meter measurement error calculation model to calculate the measurement error of each electric energy meter, specifically including:

[0012] Calculate the power consumption m0 of the electric energy meter itself;

[0013] Construct multiple energy conservation formulas to calculate the power consumption per hour in a day. The power consumption per hour is expressed as:

[0014]

[0015] right To solve the value of

[0016]

[0017] Wherein, A is the electricity matrix measured by the electric energy meter in one day;

[0018] Build About The overdetermined system of equations:

[0019]

[0020] Then the solution of the overdetermined system of equations is:

[0021]

[0022] Among them, A T is the transposed matrix of A;

[0023] according to Calculate the value of α i ;

[0024] If the energy meter measurement error α i If the accuracy level exceeds that on the meter nameplate, the meter will be marked as an out-of-tolerance meter.

[0025] In one embodiment of the present invention, the electric energy meter includes a single-phase electric energy meter, a three-phase electric energy meter and a smart electric energy meter, and the accuracy requirement of the metering on the incoming line metering side of the meter box is 0.5%. If the electric energy meter accounts for 1 / 4 of the electricity on the incoming line metering side of the meter box during a partial operating time period, the accuracy of the metering error of the electric energy meter is 2%, which is consistent with the allowable deviation of the technical specifications of the single-phase electric energy meter.

[0026] In one embodiment of the present invention, the operating time of the power consumption satisfies that the error of the power quantity measured by the incoming line metering side of the meter box is not greater than the metering error.

[0027] An electric energy meter error detection system based on the energy conservation principle comprises: an acquisition module, the acquisition module is used to acquire user electricity consumption data measured by an electric energy meter in a meter box at different time periods every day, the user electricity consumption data includes the electricity measured at the metering side of the meter box incoming line and the electricity measured by the electric energy meter; a calculation module, the calculation module is used to construct an electric energy meter measurement error calculation model, and the user electricity consumption data is input into the electric energy meter measurement error calculation model to calculate the measurement error of each of the electric energy meters; a judgment module, the judgment module is used to judge whether the measurement error of the electric energy meter exceeds the standard by comparing the calculation result with the error calibration value of the electric energy meter.

[0028] In one embodiment of the present invention, the calculation formula for the amount of electricity measured at the incoming line metering side of the meter box is:

[0029]

[0030] Among them, M0 is the power measured by the meter box incoming line measurement switch, M i is the actual power of the energy meter, α i is the measurement error of the electric energy meter, n is the number of electric energy meters, and i is a positive integer.

[0031] In one embodiment of the present invention, the calculation module is specifically used for:

[0032] Calculate the power consumption m0 of the electric energy meter itself;

[0033] Construct multiple energy conservation formulas to calculate the power consumption per hour in a day. The power consumption per hour is expressed as:

[0034]

[0035] right To solve the value of

[0036]

[0037] Wherein, A is the electricity matrix measured by the electric energy meter in one day;

[0038] Build About The overdetermined system of equations:

[0039]

[0040] Then the solution of the overdetermined system of equations is:

[0041]

[0042] Among them, A T is the transposed matrix of A;

[0043] according to Calculate the value of α i ;

[0044] If the energy meter measurement error α i If the accuracy level exceeds that on the meter nameplate, the meter will be marked as an out-of-tolerance meter.

[0045] In one embodiment of the present invention, the electric energy meter includes a single-phase electric energy meter, a three-phase electric energy meter and a smart electric energy meter, and the accuracy requirement of the metering on the incoming line metering side of the meter box is 0.5%. If the electric energy meter accounts for 1 / 4 of the electricity on the incoming line metering side of the meter box during a partial operating time period, the accuracy of the metering error of the electric energy meter is 2%, which is consistent with the allowable deviation of the technical specifications of the single-phase electric energy meter.

[0046] In one embodiment of the present invention, the operating time of the power consumption satisfies that the error of the power quantity measured by the incoming line metering side of the meter box is not greater than the metering error.

[0047] In operation, the present invention obtains user electricity consumption data measured by the electric energy meter in the meter box at different time periods every day, and constructs an electric energy meter measurement error calculation model, and 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 determines whether the measurement error of the electric energy meter exceeds the standard by comparing the calculation result with the error calibration value of the electric energy meter. In this way, the measurement error of the electric energy meter can be detected without power outage and without additional installation of standard devices, and the operation and maintenance costs of the electric energy meter are significantly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1It is a flow chart of an electric energy meter error detection method based on the energy conservation principle according to an embodiment of the present invention;

[0049] Figure 2 A schematic diagram of a power grid topology structure according to an embodiment of the present invention;

[0050] Figure 3 The invention is a block diagram of an electric energy meter error detection system based on the energy conservation principle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] Figure 1 The present invention is a flowchart of an electric energy meter error detection method based on the energy conservation principle according to an embodiment of the present invention.

[0053] like Figure 1 As shown, the electric energy meter error detection method based on the energy conservation principle of an embodiment of the present invention includes the following steps:

[0054] S1, obtaining user electricity consumption data measured by the electric energy meter in the meter box at different time periods every day, the user electricity consumption data includes the electricity measured by the metering side of the meter box incoming line and the electricity measured by the electric energy meter (ie, the actual electricity of the electric energy meter).

[0055] S2, constructing an electric energy meter measurement error calculation model, inputting user electricity consumption data into the electric energy meter measurement error calculation model to calculate the measurement error of each electric energy meter.

[0056] S3, judging whether the metering error of the electric energy meter exceeds the standard by comparing the calculation result with the error calibration value of the electric energy meter.

[0057] Specifically, if Figure 2 As shown, in the topological structure of the power grid, the range enclosed by the dotted circle S is an electricity balance system, and theoretically the total input electricity is the sum of the electricity input by all electricity meters (i.e., energy conservation). Therefore, the electricity measurement error of the electricity meter can be calculated online by obtaining the changes in the electricity measured by the user's electricity meter during daily power supply.

[0058] The measurement error of the energy meter can be set to α i , then the actual measured electricity of the restored energy meter is Then the amount of electricity measured on the incoming metering side of the meter box is:

[0059]

[0060] Among them, M0 is the power measured by the meter box incoming line measurement switch, M i is the actual power consumption of the electric energy meter (for example, the power company uses a remote meter reading system to remotely collect and transmit the power consumption data of each user to the power company every 15 minutes), α i is the measurement error of the electric energy meter, n is the number of electric energy meters, and i is a positive integer.

[0061] Furthermore, considering the power loss m0 of the electric energy meter itself in the actual meter box, according to the technical specifications of the smart electric energy meter and the actual operation test, the power loss of the single-phase electric energy meter itself can be 1.25 watts, the power loss of the three-phase electric energy meter itself can be 2.5 watts, and the power loss of the smart electric energy meter with a built-in carrier module can be 2.5 watts, and the power loss caused by the line impedance in the meter box can be ignored. Taking the meter box as the object, according to the power M0 measured on the metering side of the meter box incoming line, it can be obtained:

[0062]

[0063] Among them, m0 is the power loss of the electric energy meter itself, and T is the operating time of the electric energy meter to measure electricity.

[0064] Due to the different electricity consumption habits of different electricity users, the daily electricity consumption is different, and the electricity consumption in different time periods of a day varies greatly. Therefore, according to the characteristics of electricity consumption behavior, multiple energy conservation formulas can be constructed according to the electricity consumption of users measured in different time periods to calculate the electricity consumption per hour in a day. The expression for electricity consumption per hour is:

[0065]

[0066] right (i.e. the intermediate coefficient of the calculation, taking the meter error into account to obtain the coefficient of the restored electricity) is solved, let

[0067]

[0068] Among them, A is the electricity matrix measured by the electricity meter in one day.

[0069] Build About The overdetermined system of equations:

[0070]

[0071] Then the solution of the overdetermined system of equations is:

[0072]

[0073] Among them, AT is the transposed matrix of A. j is a positive integer, indicating the number of data sets, such as one set of data per day and per hour, then j=24.

[0074] Among them, in actual engineering practice, it is necessary to ensure that j group M i There are sufficient power consumption values ​​and the correlation is small, and far more than n M can be obtained through the changes in power consumption behavior on holidays, weekends and weekdays. i data group to ensure The value converges.

[0075] Finally, according to Calculate the value of α i , if the energy meter measurement error α i If the accuracy level exceeds that on the meter nameplate, the meter will be marked as an out-of-tolerance meter and it will be recommended to rotate the meter.

[0076] In one embodiment of the present invention, the electric energy meter includes a single-phase electric energy meter, a three-phase electric energy meter and a smart electric energy meter, and the accuracy requirement of the metering on the incoming line metering side of the meter box is 0.5%. If the electric energy meter accounts for 1 / 4 of the electricity on the incoming line metering side of the meter box during a partial operating time period, the accuracy of the metering error of the electric energy meter is 2%, which is consistent with the allowable deviation of the technical specifications of the single-phase electric energy meter.

[0077] In S1, the daily and hourly data are obtained. If the user's electricity consumption is very small and the hourly electricity consumption data does not change, the accumulated time must be increased. That is, each group of electricity consumption data obtained in step S1 must change before it can be substituted into S2 for calculation and analysis.

[0078] In one embodiment of the present invention, the operation time of the power consumption satisfies that the error of the power quantity measured at the metering side of the meter box incoming line is not greater than the metering error.

[0079] According to the electric energy meter error detection method based on the energy conservation principle in an embodiment of the present invention, the user electricity consumption data measured by the electric energy meter in the meter box at different time periods every day is obtained, and an electric energy meter measurement error calculation model is constructed, and the user electricity consumption data is input into the electric energy meter measurement error calculation model to calculate the measurement error of each electric energy meter, and then the measurement error of the electric energy meter is judged whether it exceeds the standard by comparing the calculation result with the error calibration value of the electric energy meter. In this way, the measurement error of the electric energy meter can be detected without power outage and without additional installation of standard equipment (i.e., the electric power company's special electric energy meter measurement error detector), and the operation and maintenance costs of the electric energy meter are significantly reduced.

[0080] In order to implement the electric energy meter error detection method based on the energy conservation principle of the above embodiment, the present invention also proposes an electric energy meter error detection system based on the energy conservation principle.

[0081] like Figure 3 As shown, the electric energy meter error detection system based on the energy conservation principle of the embodiment of the present invention includes: an acquisition module 100, a calculation module 200, and a judgment module 300, wherein the acquisition module 100 is used to obtain the user electricity consumption data measured by the electric energy meter in the meter box at different time periods every day, and the user electricity consumption data includes the electricity measured by the metering side of the meter box incoming line and the electricity measured by the electric energy meter; the calculation module 200 is used to construct an electric energy meter measurement error calculation model, and input the user electricity consumption data into the electric energy meter measurement error calculation model to calculate the measurement error of each electric energy meter; the judgment module 300 is used to judge whether the measurement error of the electric energy meter exceeds the standard by comparing the calculation result with the error calibration value of the electric energy meter.

[0082] In one embodiment of the present invention, Figure 2 As shown, in the topological structure of the power grid, the range encircled by the dotted circle S is an electricity balance system, and theoretically the total input electricity is the sum of the electricity input by all electricity meters. Therefore, the calculation module 200 can calculate the electricity measurement error of the electricity meter online by obtaining the changes in electricity measured by the user's electricity meter during daily power supply.

[0083] The measurement error of the energy meter can be set to α i , then the actual measured electricity of the restored energy meter is Then the amount of electricity measured on the incoming metering side of the meter box is:

[0084]

[0085] Among them, M0 is the power measured by the meter box incoming line measurement switch, M i is the actual power of the energy meter, α i is the measurement error of the electric energy meter, n is the number of electric energy meters, and i is a positive integer.

[0086] Furthermore, considering the power loss m0 of the electric energy meter itself in the actual meter box, according to the technical specifications of the smart electric energy meter and the actual operation test, the power loss of the single-phase electric energy meter itself can be 1.25 watts, the power loss of the three-phase electric energy meter itself can be 2.5 watts, and the power loss of the smart electric energy meter with a built-in carrier module can be 2.5 watts, and the power loss caused by the line impedance in the meter box can be ignored. Taking the meter box as the object, according to the power M0 measured on the metering side of the meter box incoming line, it can be obtained:

[0087]

[0088] Among them, m0 is the power loss of the electric energy meter itself, and T is the operating time of the electric energy meter to measure electricity.

[0089] Due to the different electricity consumption habits of different electricity users, the daily electricity consumption is different, and the electricity consumption in different time periods of a day varies greatly. Therefore, according to the characteristics of electricity consumption behavior, multiple energy conservation formulas can be constructed according to the electricity consumption of users measured in different time periods to calculate the electricity consumption per hour in a day. The expression for electricity consumption per hour is:

[0090]

[0091] right To solve the value of

[0092]

[0093] Among them, A is the electricity matrix measured by the electricity meter in one day.

[0094] Build About The overdetermined system of equations:

[0095]

[0096] Then the solution of the overdetermined system of equations is:

[0097]

[0098] Among them, A T is the transposed matrix of A. j is a positive integer, indicating the number of data sets, such as one set of data per day and per hour, then j=24.

[0099] Among them, in actual engineering practice, it is necessary to ensure that j group M i There are sufficient power consumption values ​​and the correlation is small, and far more than n M can be obtained through the changes in power consumption behavior on holidays, weekends and weekdays. i data group to ensure The value converges.

[0100] Finally, according to Calculate the value of α i , and determine whether it is necessary to rotate the electric energy meter through the judgment module 300. If the electric energy meter measurement error α i If the accuracy level exceeds that on the meter nameplate, the meter will be marked as an out-of-tolerance meter and it will be recommended to rotate the meter.

[0101] In one embodiment of the present invention, the electric energy meter includes a single-phase electric energy meter, a three-phase electric energy meter and a smart electric energy meter, and the accuracy requirement of the metering on the incoming line metering side of the meter box is 0.5%. If the electric energy meter accounts for 1 / 4 of the electricity on the incoming line metering side of the meter box during a partial operating time period, the accuracy of the metering error of the electric energy meter is 2%, which is consistent with the allowable deviation of the technical specifications of the single-phase electric energy meter.

[0102] In one embodiment of the present invention, the operation time of the power consumption satisfies that the error of the power quantity measured at the metering side of the meter box incoming line is not greater than the metering error.

[0103] To summarize, the acquisition module is used to obtain the user electricity consumption data measured by the electric energy meter in the meter box at different time periods every day, and a metering error calculation model for the electric energy meter is constructed. The user electricity consumption data is input into the metering error calculation model for the electric energy meter through the calculation module to calculate the metering error of each electric energy meter. Then, the calculation result is compared with the error calibration value of the electric energy meter through the judgment module to determine whether the metering error of the electric energy meter exceeds the standard. In this way, the metering error of the electric energy meter can be detected without power outage and without additional installation of standard devices, and the operation and maintenance costs of the electric energy meter are significantly reduced.

[0104] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0105] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0106] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0107] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0108] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0109] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic devices), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0110] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0111] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0112] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0113] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for detecting an error in an electric energy meter based on the principle of energy conservation, characterized in that: The following steps are involved: Obtaining user electricity consumption data measured by an electric energy meter in a 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's electricity consumption data into the electric energy meter measurement error calculation model to calculate the measurement error of each electric energy meter; By comparing the calculation result with the error calibration value of the electric energy meter, it is determined whether the metering error of the electric energy meter exceeds the standard.

2. The method for detecting an error in an electric energy meter based on the energy conservation principle according to claim 1, characterized in that: The calculation formula for the amount of electricity measured at the incoming metering side of the meter box is: Among them, M0 is the power measured by the meter box incoming line measurement switch, M i is the actual power of the energy meter, α i is the measurement error of the electric energy meter, n is the number of electric energy meters, and i is a positive integer.

3. The method for detecting an error in an electric energy meter based on the energy conservation principle according to claim 2, characterized in that: Inputting the user's electricity consumption data into the electric energy meter measurement error calculation model to calculate the measurement error of each electric energy meter, specifically including: Calculate the power consumption m0 of the electric energy meter itself; Construct multiple energy conservation formulas to calculate the power consumption per hour in a day. The power consumption per hour is expressed as: right To solve the value of Wherein, A is the electricity matrix measured by the electric energy meter in one day; Build About The overdetermined system of equations: Then the solution of the overdetermined system of equations is: Among them, A T is the transposed matrix of A; according to Calculate the value of α i ; If the energy meter measurement error α i If the accuracy level exceeds that on the meter nameplate, the meter will be marked as an out-of-tolerance meter.

4. The method for detecting an error in an electric energy meter based on the energy conservation principle according to claim 3, characterized in that: The electric energy meter includes a single-phase electric energy meter and a three-phase electric energy meter. The accuracy requirement of the measurement on the incoming line metering side of the meter box is 0.5%. If the electric energy meter accounts for 1 / 4 of the electricity on the incoming line metering side of the meter box during a partial operating time period, the accuracy of the measurement error of the electric energy meter is 2%, which is consistent with the allowable deviation of the technical specifications of the single-phase electric energy meter.

5. The method for detecting an error in an electric energy meter based on the energy conservation principle according to claim 4, characterized in that: The operating time of the power consumption satisfies that the error of the power measurement measured at the incoming line metering side of the meter box is not greater than the metering error.

6. An electric energy meter error detection system based on the energy conservation principle, characterized in that: include: An acquisition module, the acquisition module is used to acquire user electricity consumption data measured by the electric energy meter in the meter box at different time periods every day, the user electricity consumption data includes the electricity measured by the metering side of the meter box incoming line and the electricity measured by the electric energy meter; A calculation module, the calculation module is used to construct an electric energy meter measurement error calculation model, input the user's electricity consumption data into the electric energy meter measurement error calculation model, so as to calculate the measurement error of each electric energy meter; A judgment module is used to judge whether the metering error of the electric energy meter exceeds the standard by comparing the calculation result with the error calibration value of the electric energy meter.

7. The electric energy meter error detection system based on the energy conservation principle according to claim 6 is characterized in that: The calculation formula for the amount of electricity measured at the incoming metering side of the meter box is: Among them, M0 is the power measured by the meter box incoming line measurement switch, M i is the actual power of the energy meter, α u is the measurement error of the electric energy meter, n is the number of electric energy meters, and i is a positive integer.

8. The electric energy meter error detection system based on the energy conservation principle according to claim 7 is characterized in that: The calculation module is specifically used for: Calculate the power consumption m0 of the electric energy meter itself; Construct multiple energy conservation formulas to calculate the power consumption per hour in a day. The power consumption per hour is expressed as: right To solve the value of Wherein, A is the electricity matrix measured by the electric energy meter in one day; Build About The overdetermined system of equations: Then the solution of the overdetermined system of equations is: Among them, A T is the transposed matrix of A; according to Calculate the value of α i ; If the energy meter measurement error α i If the accuracy level exceeds that on the meter nameplate, the meter will be marked as an out-of-tolerance meter.

9. The electric energy meter error detection system based on the energy conservation principle according to claim 8 is characterized in that: The electric energy meters include single-phase electric energy meters, three-phase electric energy meters and smart electric energy meters. The accuracy requirement of the measurement on the incoming line metering side of the meter box is 0.5%. If the electric energy meter accounts for 1 / 4 of the electricity on the incoming line metering side of the meter box during a partial operating time period, the accuracy of the measurement error of the electric energy meter is 2%, which is consistent with the allowable deviation of the technical specifications of the single-phase electric energy meter.

10. The electric energy meter error detection system based on the energy conservation principle according to claim 9, characterized in that: The operating time of the power consumption satisfies that the error of the power measurement measured at the incoming line metering side of the meter box is not greater than the metering error.

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