A method for locating inaccurate electric energy meters using low voltage power supply line impedance data

Abstract

The present invention proposes a method for locating an inaccurate electric energy meter using impedance data of a low-voltage power supply line. The current and voltage conditions at the end of the electric energy meter are collected by an electricity consumption information collection system. The linear regression coefficient of the live line current and the neutral line current of the electric energy meter is calculated to determine whether the electric energy meter is inaccurate. Further, by judging the voltage error, it is determined whether the electric energy meter is inaccurate in voltage. Further, by calculating the system impedance measurement error calculated using the live line current and neutral line current measurement values ​​of the electric energy meter, it is determined that the neutral line current of the electric energy meter is inaccurate, the live line current of the electric energy meter is inaccurate, or both the neutral line current and the live line current of the electric energy meter are inaccurate.

Description

Technical Field

[0001] The invention belongs to the technical field of electric energy metering and collection, and in particular relates to a method for locating an inaccurate electric energy meter by utilizing impedance data of a low-voltage power supply line. Background Art

[0002] The inaccuracy of electric energy meters has long plagued power supply companies, causing economic losses to power supply companies and users. At the same time, it may cause metering disputes, affect power system management, equipment damage and safety hazards. Power supply companies need to invest a lot of resources in the calibration and maintenance of electric energy meters, increasing management and operating costs. Existing electric energy meter calibration methods are generally divided into two categories:

[0003] The first type is the hardware calibration method. This method can be achieved through two methods: external equipment and additional calibration module. The additional calibration module uses hardware devices such as the energy meter self-test analysis module, the energy meter inaccuracy re-test module, and the inaccuracy cause judgment module to perform self-tests on each energy meter, thereby screening out the faulty smart meters and determining the inaccuracy cause of the faulty smart meters.

[0004] The second type is data analysis, which collects a large amount of parameter data of electric energy meters through smart meters and master station systems, and uses big data analysis technology to detect potential inaccuracy problems and abnormal conditions. Currently, there is a method for locating inaccurate electric energy meters based on the abnormal zero-live current. This method collects the zero-line current and live-line current of the electric energy meter at the same time, calculates the corresponding zero-live current correlation system based on the collected zero-live current, and determines whether there is an abnormality in the zero-live line of the electric energy meter based on the correlation coefficient.

[0005] The existing method for locating misaligned electric energy meters has the following defects:

[0006] The first is to use the hardware calibration method. If an external device is used for calibration, it is necessary to go to the site regularly for verification, which has poor real-time performance, too large a coverage area, and too high labor costs. If the calibration module method is used, it is necessary to maintain the relevant calibration modules, and a large amount of hardware costs and hardware maintenance costs are required.

[0007] The second is to use data analysis methods. Existing methods usually build an initial misalignment model based on data from multiple electric energy meters, and then confirm the misalignment model parameters based on the area topology data. This method needs to be based on massive data, has high requirements for data accuracy, and is not sensitive to the positioning of electric energy meters with small misalignments. At the same time, the method of judging whether an electric energy meter is misaligned by the zero-line and live-line currents of the electric energy meter cannot directly determine whether it is a zero-line misalignment or a live-line misalignment. Summary of the invention

[0008] In order to solve the blind spot of the existing electric energy meter misalignment positioning technology, the present invention proposes a method for locating misaligned electric energy meters using low-voltage power supply line impedance data, collects the current and voltage (curve) at the end of the electric energy meter through the power consumption information collection system, and determines whether the electric energy meter is misaligned by calculating the linear regression coefficient of the live line current and the neutral line current of the electric energy meter. Further, by judging the voltage error, it is determined whether the electric energy meter is misaligned in voltage. Further, by calculating the system impedance measurement error calculated using the live line current and neutral line current measurement values ​​of the electric energy meter, it is determined whether the electric energy meter neutral line current is misaligned, the electric energy meter live line current is misaligned, and the electric energy meter neutral line current and live line current are both misaligned. The electric energy meter voltage misalignment, the electric energy meter live line current misalignment, the electric energy meter neutral line current misalignment, and the electric energy meter live and neutral line current misalignment can be directly located.

[0009] The specific technical solutions are as follows:

[0010] A method for locating an inaccurate electric energy meter using low-voltage power supply line impedance data comprises the following steps:

[0011] Based on the clock synchronization of all electric energy meters, a collection task is configured for each electric energy meter in the substation area to collect the electric energy meter The neutral current With live wire current ,in is the zero line current of the ith electric energy meter in the entire substation, is the live wire current of the ith electric energy meter in the entire substation;

[0012] Record every energy meter The neutral current With live wire current , calculate the neutral current With live wire current The linear regression coefficient k i , according to the linear regression coefficient k i Judging the energy meter Whether the neutral line and live line are misaligned;

[0013] For each electric energy meter with misaligned neutral and live wires, calculate the electrical distance d from each other electric energy meter with the same phase. 12 , and calculate the electrical distance d from the transformer 01 , select d 01 >>d 12 , and d 12 The smallest non-de-calibrated energy meter is the reference energy meter ;

[0014] For each electric energy meter with misaligned neutral and live wires, calculate and reference the electric energy meter Voltage measurement error , screening voltage measurement error The energy meter with a voltage greater than the set threshold is a voltage inaccurate energy meter, which can filter out voltage measurement errors. The electric energy meter with a voltage less than the set threshold is a voltage meter with no voltage inaccuracy;

[0015] For each watt-hour meter with inaccurate voltage, calculate the system impedance R using the live wire current measurement value of the watt-hour meter. L , and the system impedance R calculated using the zero-line current measurement value of the energy meter N ;

[0016] For each watt-hour meter with inaccurate voltage, calculate the system impedance measurement error calculated using the live wire current measurement value of the watt-hour meter. , and the system impedance measurement error calculated using the neutral current measurement value of the energy meter :

[0017] like and If both are greater than the set threshold, it is judged that both the live wire current and the neutral wire current of the electric energy meter are inaccurate;

[0018] like is greater than the set threshold, If it is normal, it is judged that the zero-line current of the electric energy meter is inaccurate;

[0019] like is greater than the set threshold, If it is normal, it is judged that the live wire current of the energy meter is inaccurate.

[0020] Furthermore, the method for synchronizing the clocks of all electric energy meters is specifically as follows: the main station for collecting electricity information sends a time synchronization task to the electric energy meter, and the electric energy meter executes the time synchronization task to ensure that the clocks of all electric energy meters are synchronized and control the consistency of the reference time variable for data comparison.

[0021] Furthermore, according to the linear regression coefficient k i The specific method to determine whether the neutral line and the live line are inaccurate is:

[0022] The linear regression coefficient k i The calculation formula is as follows:

[0023] (1)

[0024] if , represents the energy meter There is a measurement error between the neutral line and the live line current, and the measurement error is expressed as:

[0025] (2)

[0026] Screening of neutral and live line measurement errors The electric energy meter whose value is less than the set threshold value is regarded as the electric energy meter whose neutral line and live line are not misaligned. Otherwise, it is judged as the electric energy meter whose neutral line and live line are misaligned.

[0027] Furthermore, the specific method for selecting the reference electric energy meter is:

[0028] For each electric energy meter with misaligned neutral and live wires, calculate the Pearson correlation coefficient ρ of the voltage with each other electric energy meter with the same phase;

[0029] According to the Pearson correlation coefficient ρ of the voltage, the electrical distance d between each electric energy meter with misaligned neutral and live wire and each other electric energy meter with the same phase is calculated. 12 , where the electrical distance d 12 The calculation formula is as follows:

[0030] (3)

[0031] Calculate the electrical distance d between each meter with misaligned neutral and live wires and the transformer 01 , select d 01 Much larger than d 12 , and d 12 The smallest inaccurate energy meter is used as the reference energy meter .

[0032] Furthermore, the specific method for screening the electric energy meter with inaccurate voltage is as follows:

[0033] Record every energy meter The corresponding voltage value U i With current value I i ;

[0034] Calculate the voltage measurement value of each meter with misaligned neutral and live wires and the voltage value of the reference meter The linear regression coefficient α i :

[0035] (3)

[0036] Calculate the voltage measurement error of each electric energy meter with misaligned neutral and live wires :

[0037] (4)

[0038] Screening voltage measurement errors The electric energy meter with a voltage less than a given threshold is regarded as an electric energy meter with no voltage inaccuracy.

[0039] Furthermore, the calculation formula of the system impedance value R calculated using the current measurement value of the electric energy meter is as follows:

[0040] (5)

[0041] in, They are the voltage and current values ​​after the user load is switched on and off, The voltage and current values ​​before the user load is switched on and off. It is the voltage change value before and after the user load is switched on. It is the current change value before and after the user load is switched on;

[0042] The system impedance R is calculated using the live line current measurement value and the neutral line current measurement value respectively. L With R N .

[0043] Furthermore, the calculation method of the system impedance measurement error is:

[0044] For each voltage-inaccurate watt-hour meter, calculate the system impedance measurement value calculated using the current measurement value of the watt-hour meter, and calculate the linear regression coefficient φ with the impedance measurement value of the reference watt-hour meter i :

[0045] (6)

[0046] For each watt-hour meter with inaccurate voltage, calculate the system impedance measurement error calculated using the current measurement value of the watt-hour meter :

[0047] (7)

[0048] According to formula (7), the system impedance measurement error calculated by using the live wire current measurement value of the electric energy meter is calculated: , and the system impedance measurement error calculated using the zero line current measurement value of the energy meter .

[0049] An electronic device comprises a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the program, the steps of the method for locating a misaligned electric energy meter using low-voltage power supply line impedance data as described above are implemented.

[0050] A non-transitory computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of a method for locating an inaccurate electric energy meter using low-voltage power supply line impedance data as described above.

[0051] Compared with the prior art, the beneficial effects of the present invention and its preferred embodiments include at least:

[0052] 1. The existing method of calibrating the electric energy meter using hardware requires the installation of relevant calibration equipment, which is costly. However, the solution of the present invention does not require the addition of hardware equipment, and can locate the inaccuracy of the electric energy meter by only using the voltage and current data of the daily operation of the electric energy meter;

[0053] 2. The existing data analysis method collects a large amount of parameter data of the energy meter through the smart meter and the master station system, and uses big data analysis technology to detect potential inaccuracy problems and abnormal conditions. The existing scheme can only determine whether there is an inaccuracy in the neutral and live wires at most, and cannot accurately determine whether the neutral wire is inaccurate or the live wire is inaccurate. The scheme of the present invention can further determine that the energy meter is not inaccurate, the energy meter voltage is inaccurate, the energy meter live wire current is inaccurate, the energy meter neutral wire current is inaccurate, and the energy meter neutral wire and live wire current are both inaccurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0055] Figure 1 A flow chart of a method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present invention will be described clearly and completely below in combination with 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.

[0057] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0058] The present invention will be further described below in conjunction with specific embodiments, but the present invention is not limited thereto.

[0059] like Figure 1 As shown, an embodiment of the present invention provides a method for locating an inaccurate electric energy meter using low-voltage power supply line impedance data, and the main steps are as follows:

[0060] Step S1: The main station for collecting electricity information issues a time synchronization task to the electric energy meter, and the electric energy meter executes the time synchronization task to ensure that the clocks of all electric energy meters are synchronized and the consistency of the reference time variable for controlling data comparison is achieved;

[0061] Step S2: Configure a collection task for each electric energy meter in the entire area to collect The neutral current With live wire current ,in is the zero line current of the watt-hour meter in the entire substation area, is the live wire current of the i-th electric energy meter in the entire substation.

[0062] Step S3: Record each electric energy meter The neutral current With live wire current , calculate the neutral current With live wire current The linear regression coefficient k i , according to the linear regression coefficient k i Determine whether the neutral line and live line are inaccurate;

[0063] Step S4: For each electric energy meter with misaligned neutral and live wires, calculate the electrical distance d between it and each other electric energy meter with the same phase. 12 , and calculate the electrical distance d from the transformer 01 , select d 01 >>d 12 , and d 12 The smallest non-de-calibrated energy meter is the reference energy meter ;

[0064] Step S5: For each electric energy meter with misaligned neutral and live wires, calculate the voltage measurement error between it and the reference electric energy meter , screening voltage measurement error The electric energy meter with a voltage greater than a certain threshold is a voltage inaccurate electric energy meter, which can screen the voltage measurement error. The electric energy meter with a voltage less than a certain threshold is a voltage-inaccurate electric energy meter;

[0065] Step S6: for each electric energy meter whose voltage is not inaccurate, calculating the system impedance value calculated by using the live line current measurement value of the electric energy meter and the system impedance value calculated by using the neutral line current measurement value of the electric energy meter;

[0066] Step S7: For each electric energy meter with inaccurate voltage, calculate the system impedance measurement error calculated using the live wire current measurement value of the electric energy meter The measurement error of the system impedance calculated using the neutral current measurement value of the energy meter ;

[0067] Step S8: respectively determining the system impedance measurement error calculated using the live wire current measurement value of the electric energy meter The measurement error of the system impedance calculated using the neutral current measurement value of the energy meter Condition:

[0068] like and If both are greater than a certain threshold, the live wire current and the neutral wire current of the electric energy meter are inaccurate;

[0069] like is greater than a certain threshold, If it is normal, the zero-line current of the energy meter is inaccurate;

[0070] like is greater than a certain threshold, If it is normal, the live wire current of the energy meter is inaccurate.

[0071] Step S3 includes the following steps:

[0072] Step S31: Record the neutral current and live current of each electric energy meter and calculate the neutral current With live wire current The linear regression coefficient of each electric energy meter The linear regression coefficient k i The calculation formula is as follows:

[0073] (1)

[0074] Step S32: When , represents the energy meter There is a measurement error between the neutral line and the live line current, and the measurement error is expressed as:

[0075] (2)

[0076] Step S33: Screening the measurement error of the neutral line and the live line The electric energy meter with a value less than a certain threshold is regarded as an electric energy meter with a neutral line and a live line that are not misaligned. Otherwise, it is regarded as an electric energy meter with a neutral line and a live line that are misaligned.

[0077] Step S4 includes the following steps:

[0078] Step S41: for each electric energy meter whose neutral line and live line are misaligned, calculate the Pearson correlation coefficient ρ of its voltage with that of each other electric energy meter with the same phase;

[0079] Step S42: Calculate the electrical distance d between each electric energy meter with misaligned neutral and live wires and each other electric energy meter with the same phase according to the Pearson correlation coefficient of the voltage. 12 , where the electrical distance d 12 The calculation formula is as follows:

[0080] (3)

[0081] Step S43: Calculate the electrical distance d between each electric energy meter with misaligned neutral and live wires and the transformer 01 , select d 01 Much larger than d12 , and d 12 The smallest inaccurate energy meter is used as the reference energy meter .

[0082] Step S5 includes the following steps:

[0083] Step S51: For each electric energy meter with misaligned neutral and live wires, calculate the electrical distance d between it and each other electric energy meter with the same phase. 12 , and calculate the electrical distance d from the transformer 01 , select d 01 >>d 12 , and d 12 The smallest non-de-calibrated energy meter is the reference energy meter ;

[0084] Step S52: Record each electric energy meter The voltage value U i With current value I i ;

[0085] Step S53: Calculate the voltage measurement value U of each electric energy meter with misaligned neutral and live wires i Voltage value with reference electric energy meter The linear regression coefficient α i , the specific linear regression coefficient α i The calculation is as follows:

[0086] (3)

[0087] Step S54: Calculate the voltage measurement error of each electric energy meter with misaligned neutral and live wires , the specific voltage measurement error The calculation is as follows:

[0088] (4)

[0089] Step S55: Screening voltage measurement errors The electric energy meter with a voltage lower than a certain threshold is regarded as an electric energy meter with inaccurate voltage.

[0090] Step S6 includes the following steps:

[0091] Step S61: For each electric energy meter with voltage not misaligned, calculate the system impedance value R calculated using the live wire current measurement value of the electric energy meter L The system impedance R calculated using the zero-line current measurement value of the energy meter N ;

[0092] Step S62: wherein the system impedance value R is calculated using the current measurement value of the electric energy meter according to the following calculation formula:

[0093] (5)

[0094] in, They are the voltage and current values ​​after the user load is switched on and off, The voltage and current values ​​before the user load is switched on and off. It is the voltage change value before and after the user load is switched on. It is the current change value before and after the user load is switched on and off.

[0095] Step S63: Calculate the impedance value R of the system using the live current measurement value and the neutral current measurement value respectively L With R N .

[0096] Step S7 includes the following steps:

[0097] Step S71: for each electric energy meter with non-inaccurate voltage, calculate the system impedance measurement value calculated using the current measurement value of the electric energy meter, and calculate the linear regression coefficient between the system impedance measurement value and the impedance measurement value of the reference electric energy meter. The calculation formula is as follows:

[0098] (6)

[0099] Step S72: For each electric energy meter with non-inaccurate voltage, calculate the system impedance measurement error calculated using the current measurement value of the electric energy meter The calculation formula is as follows:

[0100] (7)

[0101] Step S73: According to the above formula, the system impedance measurement error calculated by using the live wire current measurement value of the electric energy meter is calculated. , and the system impedance measurement error calculated using the zero line current measurement value of the energy meter .

[0102] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0103] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0104] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0105] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0106] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

[0107] This patent is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of a method for locating an inaccurate electric energy meter using low-voltage power supply line impedance data under the inspiration of this patent. All equal changes and modifications made within the scope of the patent application of the present invention should be covered by this patent.

Claims

1. A method for locating an inaccurate electric energy meter using low-voltage power supply line impedance data, characterized in that: The following steps are involved: Based on the clock synchronization of all electric energy meters, a collection task is configured for each electric energy meter in the substation area to collect the electric energy meter The neutral current With live wire current ,in is the zero line current of the ith electric energy meter in the entire substation, is the live wire current of the ith electric energy meter in the entire substation; Record every energy meter The neutral current With live wire current , calculate the neutral current With live wire current The linear regression coefficient k i , according to the linear regression coefficient k i Judging the energy meter Whether the neutral line and live line are misaligned; For each electric energy meter with misaligned neutral and live wires, calculate the electrical distance d from each other electric energy meter with the same phase. 12 , and calculate the electrical distance d from the transformer 01 , select d 01 >>d 12 , and d 12 The smallest non-de-calibrated energy meter is the reference energy meter ; For each electric energy meter with misaligned neutral and live wires, calculate and reference the electric energy meter Voltage measurement error , screening voltage measurement error The energy meter with a voltage greater than the set threshold is a voltage inaccurate energy meter, which can filter out voltage measurement errors. The electric energy meter with a voltage less than the set threshold is a voltage meter with no voltage inaccuracy; For each watt-hour meter with inaccurate voltage, calculate the system impedance R using the live wire current measurement value of the watt-hour meter. L , and the system impedance R calculated using the zero-line current measurement value of the energy meter N ; For each watt-hour meter with inaccurate voltage, calculate the system impedance measurement error calculated using the live wire current measurement value of the watt-hour meter. , and the system impedance measurement error calculated using the neutral current measurement value of the energy meter : like and If both are greater than the set threshold, it is judged that both the live wire current and the neutral wire current of the electric energy meter are inaccurate; like is greater than the set threshold, If it is normal, it is judged that the zero-line current of the electric energy meter is inaccurate; like is greater than the set threshold, If it is normal, it is judged that the live wire current of the energy meter is inaccurate; According to the linear regression coefficient k i The specific method to determine whether the neutral line and the live line are inaccurate is: The linear regression coefficient k i The calculation formula is as follows: （1） if , represents the energy meter There is a measurement error between the neutral line and the live line current, and the measurement error is expressed as: （2） Screening of neutral and live line measurement errors The electric energy meter whose value is less than the set threshold value is regarded as the electric energy meter whose neutral line and live line are not misaligned. Otherwise, it is judged as the electric energy meter whose neutral line and live line are misaligned.

2. The method for locating an inaccurate electric energy meter using low-voltage power supply line impedance data according to claim 1, characterized in that: The specific method for synchronizing the clocks of all electric energy meters is: the main station for collecting electricity information sends a time synchronization task to the electric energy meter, and the electric energy meter executes the time synchronization task to ensure that the clocks of all electric energy meters are synchronized and control the consistency of the reference time variable for data comparison.

3. The method for locating an inaccurate electric energy meter using low-voltage power supply line impedance data according to claim 1, characterized in that: The specific method for selecting the reference electric energy meter is: For each electric energy meter with misaligned neutral and live wires, calculate the Pearson correlation coefficient ρ of the voltage with each other electric energy meter with the same phase; According to the Pearson correlation coefficient ρ of the voltage, the electrical distance d between each electric energy meter with misaligned neutral and live wire and each other electric energy meter with the same phase is calculated. 12 , where the electrical distance d 12 The calculation formula is as follows: （3） Calculate the electrical distance d between each meter with misaligned neutral and live wires and the transformer 01 , select d 01 Much larger than d 12 , and d 12 The smallest inaccurate energy meter is used as the reference energy meter .

4. The method for locating an inaccurate electric energy meter using low-voltage power supply line impedance data according to claim 1, characterized in that: The specific method for screening electric energy meters with inaccurate voltage is as follows: Record every energy meter The corresponding voltage value U i With current value I i ; Calculate the voltage measurement value of each meter with misaligned neutral and live wires and the voltage value of the reference meter The linear regression coefficient α i : （3） Calculate the voltage measurement error of each electric energy meter with misaligned neutral and live wires : （4） Screening voltage measurement errors The energy meter with a voltage less than a given threshold is regarded as an energy meter with no voltage inaccuracy.

5. The method for locating an inaccurate electric energy meter using low-voltage power supply line impedance data according to claim 1, characterized in that: The calculation formula of the system impedance value R calculated using the current measurement value of the electric energy meter is as follows: （5） in, They are the voltage and current values ​​after the user load is switched on and off, The voltage and current values ​​before the user load is switched on and off. It is the voltage change value before and after the user load is switched on. It is the current change value before and after the user load is switched on; The system impedance R is calculated using the live line current measurement value and the neutral line current measurement value respectively. L With R N .

6. The method for locating an inaccurate electric energy meter using low-voltage power supply line impedance data according to claim 1, characterized in that: The calculation method of the system impedance measurement error is: For each voltage-inaccurate watt-hour meter, calculate the system impedance measurement value calculated using the current measurement value of the watt-hour meter, and calculate the linear regression coefficient φ with the impedance measurement value of the reference watt-hour meter i : （6） For each watt-hour meter with inaccurate voltage, calculate the system impedance measurement error calculated using the current measurement value of the watt-hour meter : （7） According to formula (7), the system impedance measurement error calculated by using the live wire current measurement value of the electric energy meter is calculated: , and the system impedance measurement error calculated using the zero line current measurement value of the energy meter .

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of a method for locating a misaligned electric energy meter using low-voltage power supply line impedance data as described in any one of claims 1 to 6 are implemented.

8. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of a method for locating a misaligned electric energy meter using low-voltage power supply line impedance data as described in any one of claims 1 to 6 are implemented.

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