Method for improving precision of measuring circuit based on intelligent fusion terminal, concentrator and electric energy meter

Abstract

The invention discloses a method for improving the precision of a measuring circuit based on an intelligent fusion terminal, a concentrator and an electric energy meter. The method comprises the following steps: controlling the intelligent fusion terminal to obtain current power consumption data, current current phase data and current voltage phase data in a subordinate electric energy meter corresponding to the intelligent fusion terminal; obtaining a first phase difference between current and voltage in the electric energy meter according to the current current phase data and the current voltage phase data; obtaining a power utilization compensation coefficient corresponding to the first phase difference according to the first phase difference and a phase difference-compensation coefficient function relationship; compensating the current power consumption data according to the power consumption compensation coefficient to obtain actual power consumption; and controlling to send the actual electricity consumption and the corresponding electric energy meter to a concentrator for data processing. The power consumption is compensated, so that the precision of the measuring circuit is improved.

Description

Technical Field

[0001] The present invention relates to the field of electric energy meters, and in particular to a method for improving the accuracy of a measurement circuit based on an intelligent fusion terminal, a concentrator, and an electric energy meter. Background Art

[0002] The intelligent fusion terminal (SFT) and the concentrator play different but complementary roles in the power system. Together, they form an "edge - aggregation" collaborative architecture to support the intelligent management and efficient data transmission of the distribution network. The intelligent fusion terminal is usually deployed on the user side or the distribution transformer side. As an edge - computing device, it integrates functions such as data acquisition, local control, and communication. For example, it is used in scenarios such as low - voltage distribution monitoring, distributed energy access (such as photovoltaic), and demand response. The concentrator belongs to the intermediate - layer device on the distribution side or the master - station side, and is responsible for aggregating the data of multiple SFTs or intelligent electric meters and uploading it to the master - station system through remote communication (such as optical fiber, 4G / 5G). The concentrator is usually installed near the distribution room, transformer substation area, or substation.

[0003] However, in the power system composed of an intelligent fusion terminal, a concentrator, and an electric energy meter, the measurement accuracy often decreases. One of the reasons for the decrease in the accuracy of the measurement circuit is that the current transformer (CT) and voltage transformer (PT) in the electric energy meter introduce phase shifts due to their own inductive reactance and resistance. Because the phase shift of CT / PT will cause power - factor measurement errors, which in turn leads to a decrease in measurement accuracy. Summary of the Invention

[0004] In view of the above - mentioned partial defects of the prior art, the technical problem to be solved by the present invention is to provide a method for improving the accuracy of a measurement circuit based on an intelligent fusion terminal, a concentrator, and an electric energy meter, aiming to improve the accuracy of the measurement circuit by compensating for the power consumption.

[0005] To achieve the above object, the present invention discloses a method for improving the accuracy of a measurement circuit based on an intelligent fusion terminal, a concentrator, and an electric energy meter, and the method includes:

[0006] Step S1, controlling the intelligent fusion terminal to obtain the current power - consumption data, the current current - phase data, and the current voltage - phase data in its corresponding subordinate electric energy meter; wherein, one said intelligent fusion terminal is connected to at least one subordinate said electric energy meter, and the intelligent fusion terminal is connected to the concentrator to which it belongs;

[0007] Step S2: Obtain the first phase difference between the current and voltage in the electricity meter based on the current current phase data and the current voltage phase data; obtain the electricity consumption compensation coefficient corresponding to the first phase difference according to the relationship between the first phase difference and the phase difference-compensation coefficient function; wherein, the electricity consumption compensation coefficient changes according to the first phase difference, and the phase difference-compensation coefficient function relationship is the functional relationship between the first phase difference and the electricity consumption compensation coefficient;

[0008] Step S3: Compensate the current electricity consumption data according to the electricity consumption compensation coefficient to obtain the actual electricity consumption; wherein, the current electricity consumption data includes at least the current electricity consumption;

[0009] Step S4: Control to send the actual electricity consumption and the corresponding electricity meter to the concentrator for data processing.

[0010] Optionally, after the step S1, the method further includes:

[0011] Obtain the current current phase and the current voltage phase in the current current phase data and the current voltage phase data;

[0012] Obtain the previous current phase data and the previous voltage phase data corresponding to the current current phase data and the current voltage phase data; obtain the previous current phase and the previous voltage phase according to the previous current phase data and the previous voltage phase data;

[0013] Obtain the current phase change amplitude according to the current current phase and the previous current phase; obtain the voltage phase change amplitude according to the current voltage phase and the previous voltage phase;

[0014] Generate a transformer synchronization instruction according to the current phase change amplitude and the voltage phase change amplitude; wherein, the transformer synchronization instruction is used to synchronize the acquisition times of the current transformer and the voltage transformer in the electricity meter.

[0015] Optionally, the steps for obtaining the phase difference-compensation coefficient function relationship include:

[0016] Adjust the phase difference between the current transformer and the voltage transformer in the electricity meter to the experimental phase difference;

[0017] Apply a known experimental current and experimental voltage to the electricity meter, and collect the measured current and measured voltage on the secondary sides corresponding to the current transformer and the voltage transformer;

[0018] Obtain the electricity consumption compensation coefficient corresponding to the experimental phase difference according to the experimental current, the experimental voltage, the measured current, and the measured voltage;

[0019] Repeat the above steps to obtain the power consumption compensation coefficients corresponding to different experimental phase differences, and further obtain the phase difference-compensation coefficient functional relationship.

[0020] Optionally, step S3 includes:

[0021] According to

[0022] W = P×Δt×λ

[0023] Obtain the actual power consumption; where W is the actual power consumption, P is the current power consumption, Δt is the acquisition time interval of the mutual inductor, P×Δt is the current power consumption, and λ is the power consumption compensation coefficient.

[0024] Optionally, in step S1, the method further includes:

[0025] Control the intelligent fusion terminal to filter the total power consumption data of the watt-hour meter; where the total power consumption data includes the current power consumption data, the current current phase data, and the current voltage phase data.

[0026] Optionally, the method further includes:

[0027] According to the current power consumption data, the current current phase data, and the current voltage phase data, determine whether the watt-hour meter is abnormal; if so, send a maintenance reporting instruction to the concentrator, if not, perform normal operation.

[0028] Optionally, before step S1, the method further includes:

[0029] Apply multiple corresponding standard electrical loads to the primary side of the mutual inductor of the watt-hour meter, and collect the corresponding measured electrical loads on the secondary side to obtain multiple data groups; where each data group includes a pair of corresponding standard electrical loads and measured electrical loads, and the electrical load includes current and voltage;

[0030] Fit the data groups to obtain the first fitting functional relationship of the secondary-side electrical load following the change of the primary-side electrical load; where the first fitting functional relationship includes a head non-linear region, a middle linear region, and a tail non-linear region;

[0031] Compare the first fitting function relationship with the standard function relationship. In response to the complete match between the first fitting function and the standard function relationship, it is determined that the electric energy meter does not require parameter compensation. In response to the mismatch between the middle linear region and the standard function relationship, it is determined that there is a deviation in the load resistance of the current transformer, and according to the middle linear region and the standard function relationship, a resistance deviation parameter compensation is performed on the load resistance. In response to the mismatch between the head non-linear region and the tail non-linear region and the standard function relationship, it is determined that there is a deviation in the magnetic permeability of the current transformer, and according to the head non-linear region and / or the tail non-linear region, a magnetic permeability deviation parameter compensation is performed on the magnetic permeability.

[0032] Optionally, after the step S4, the method further includes:

[0033] Control the concentrator to upload the processed corresponding data of each electric energy meter to the master station.

[0034] Advantages of the present invention: 1. Based on the relationship between the phase difference of the current and voltage of the current transformer in the electric energy meter affecting the power consumption compensation, the phase difference-compensation coefficient function relationship is obtained; then the first phase difference between the current phase and the voltage phase in the electric energy meter is obtained, and according to the first phase difference and the phase difference-compensation coefficient function relationship, the power consumption compensation coefficient corresponding to the first phase difference is obtained. The current power consumption is compensated by the power consumption compensation coefficient, so that the compensated power consumption is closer to the actual power consumption, thereby improving the accuracy of the measurement circuit. 2. The present invention obtains the acquisition time intervals of the current transformer and the voltage transformer through the amplitude changes of two adjacent current phases and two adjacent voltage phases, and then synchronizes the acquisition times of the two, effectively solving the problem of deviation in the acquisition time intervals of the current transformer and the voltage transformer due to various factors, thereby improving the accuracy of the measurement circuit. 3. The present invention can collect the electrical load data on the primary and secondary sides of the current transformer of the electric energy meter, fit the corresponding function relationship and compare it with the standard function relationship to obtain the part of the current transformer that needs parameter compensation, and then make corresponding automatic compensation. Based on this, the present invention can effectively distinguish the reasons for the error of the electric energy meter, make targeted compensation for the load resistance and magnetic permeability, make the compensation more accurate, and thereby improve the measurement accuracy of the compensated electric energy meter. Therefore, according to the differences in the measurement circuits of each main board in the electric energy meter, the present invention provides differential compensation, so that when mass-produced, the compensation values of each main board are personalized and adapted, improving the measurement accuracy of each electric energy meter at the time of leaving the factory.

[0035] In summary, the present invention can effectively improve the accuracy of the measurement circuit, and thus obtain more accurate measurement data. Description of the Drawings

[0036] Figure 1It is a schematic flowchart of a method for improving the measurement circuit accuracy based on an intelligent fusion terminal, a concentrator, and a watt-hour meter provided by a specific embodiment of the present invention;

[0037] Figure 2 It is a schematic diagram of the functional relationship between the phase difference between the secondary side current and voltage of the mutual inductor provided by a specific embodiment of the present invention. Specific embodiments

[0038] The present invention discloses a method for improving the measurement circuit accuracy based on an intelligent fusion terminal, a concentrator, and a watt-hour meter. Those skilled in the art can draw on the content of this article and appropriately improve the technical details to implement it. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art, and they are all regarded as included in the present invention. The method and application of the present invention have been described through preferred embodiments, and those skilled in the art can obviously make changes or appropriate alterations and combinations to the methods and applications described herein without departing from the content, spirit, and scope of the present invention to implement and apply the technology of the present invention.

[0039] After research by the applicant, it is found that: However, in the power system composed of an intelligent fusion terminal, a concentrator, and a watt-hour meter, the measurement accuracy often decreases. The phase shift introduced by the self-inductive reactance and resistance of the current transformer (CT) and voltage transformer (PT) in the watt-hour meter is one of the reasons for the decrease in the measurement circuit accuracy. Because the phase shift of CT / PT will cause measurement errors in the power factor, which in turn leads to a decrease in the measurement accuracy.

[0040] Therefore, the embodiment of the present invention provides a method for improving the measurement circuit accuracy based on an intelligent fusion terminal, a concentrator, and a watt-hour meter, as Figure 1 shown, the method includes:

[0041] Step S1, control the intelligent fusion terminal to obtain the current power consumption data, current current phase data, and current voltage phase data in its corresponding subordinate watt-hour meter.

[0042] Among them, one intelligent fusion terminal is at least connected to one subordinate watt-hour meter, and the intelligent fusion terminal is connected to the concentrator to which it belongs.

[0043] In specific applications, the watt-hour meter belongs to the subordinate device of the intelligent fusion terminal, and the intelligent fusion terminal belongs to the subordinate device of the concentrator. After the intelligent fusion terminal preliminarily processes the watt-hour meter data, it is sent to the concentrator.

[0044] In this specific embodiment, in step S1, the method further includes:

[0045] Control the intelligent fusion terminal to filter the total power consumption data of the watt-hour meter; among them, the total power consumption data includes the current power consumption data, current current phase data, and current voltage phase data.

[0046] It should be noted that there is noise in data transmission. Removing the noise and increasing the signal-to-noise ratio can further improve the measurement accuracy.

[0047] After step S1, the method further includes:

[0048] Obtain the current current phase and the current voltage phase in the current current phase data and the current voltage phase data;

[0049] Obtain the previous current phase data and the previous voltage phase data corresponding to the current current phase data and the current voltage phase data; according to the previous current phase data and the previous voltage phase data, obtain the previous current phase and the previous voltage phase;

[0050] Obtain the current phase change amplitude according to the current current phase and the previous current phase; obtain the voltage phase change amplitude according to the current voltage phase and the previous voltage phase;

[0051] Generate a transformer synchronization instruction according to the current phase change amplitude and the voltage phase change amplitude; wherein, the transformer synchronization instruction is used to synchronize the acquisition times of the current transformer and the voltage transformer in the watt-hour meter.

[0052] It should be noted that generally, a current transformer and a voltage transformer work together in a watt-hour meter, and the two need to ensure that the acquisition intervals and the acquisition time points are the same to make the obtained power accurate. In practical applications, however, the acquisition intervals and the acquisition time points often deviate due to some factors, which will greatly affect the measurement accuracy of the electricity consumption. And the present invention can effectively obtain the current acquisition time interval by using the current phase change amplitude, obtain the voltage acquisition time interval by using the voltage phase change amplitude, synchronize the acquisition time intervals of the two, and only need to align the acquisition time points. This embodiment can solve the problem of different acquisition times of the two transformers, and thus improve the measurement accuracy.

[0053] In this specific embodiment, after step S1, the method further includes:

[0054] Judge whether the watt-hour meter is abnormal according to the current electricity consumption data, the current current phase data and the current voltage phase data; if so, send a maintenance report instruction to the concentrator, if not, perform normal work.

[0055] It should be noted that the electricity consumption data are mutually matched. Once a certain data is abnormal, it is very likely that there is an abnormality in the line or the watt-hour meter, and corresponding maintenance is required. This embodiment can detect the fault in time and avoid more losses.

[0056] In this specific embodiment, before step S1, the method further includes:

[0057] Apply a plurality of corresponding standard electrical loads to the primary side of the instrument transformer of the electricity meter, and collect the corresponding measured electrical loads on the secondary side to obtain a plurality of data sets; wherein, each data set includes a pair of corresponding standard electrical loads and measured electrical loads, and the electrical loads include current and voltage;

[0058] Perform fitting on the data sets to obtain the first fitting function relationship of the electrical load on the secondary side following the change of the electrical load on the primary side; wherein, the first fitting function relationship includes a head non-linear region, a middle linear region, and a tail non-linear region;

[0059] Compare the first fitting function relationship with the standard function relationship. In response to the complete match between the first fitting function and the standard function relationship, it is determined that the electricity meter does not require parameter compensation; in response to the mismatch between the middle linear region and the standard function relationship, it is determined that there is a deviation in the load resistance of the instrument transformer, and the resistance deviation parameter compensation for the load resistance is performed according to the middle linear region and the standard function relationship; in response to the mismatch between the head non-linear region and the tail non-linear region and the standard function relationship, it is determined that there is a deviation in the magnetic permeability of the instrument transformer, and the magnetic permeability deviation parameter compensation for the magnetic permeability is performed according to the head non-linear region and / or the tail non-linear region.

[0060] It should be noted that this embodiment can perform differential compensation for different problems of the electricity meter to make the measurement of each electricity meter more accurate.

[0061] Step S2: Obtain the first phase difference between the current and the voltage in the electricity meter according to the current phase data and the current voltage phase data; obtain the electricity consumption compensation coefficient corresponding to the first phase difference according to the first phase difference and the phase difference-compensation coefficient function relationship.

[0062] Among them, the electricity consumption compensation coefficient changes according to the first phase difference, and the phase difference-compensation coefficient function relationship is the function relationship between the first phase difference and the electricity consumption compensation coefficient.

[0063] In this specific embodiment, the function relationship diagram of the first phase difference between the current and the voltage in the electricity meter can be as Figure 2 shown. The phase difference between the primary side and the secondary side of the instrument transformer remains the same.

[0064] In this specific embodiment, the steps for obtaining the phase difference-compensation coefficient function relationship include:

[0065] Adjust the phase difference between the current transformer and the voltage transformer in the electricity meter to the experimental phase difference;

[0066] Apply known experimental current and experimental voltage to the electricity meter, and collect the measured current and measured voltage on the secondary side corresponding to the current transformer and the voltage transformer;

[0067] Obtain the electricity consumption compensation coefficient corresponding to the experimental phase difference according to the experimental current, experimental voltage, measured current, and measured voltage;

[0068] Repeat the above steps to obtain the electricity consumption compensation coefficients corresponding to different experimental phase differences, and then obtain the phase difference-compensation coefficient functional relationship.

[0069] It should be noted that the applicant's research found that the phase difference between current and voltage will affect the electricity consumption compensation and shows a certain ratio relationship. Therefore, there is a phase difference-compensation coefficient functional relationship, and the larger the phase difference in the phase difference-compensation coefficient functional relationship, the larger the electricity consumption compensation coefficient.

[0070] Step S3: Compensate the current electricity consumption data according to the electricity consumption compensation coefficient to obtain the actual electricity consumption.

[0071] Among them, the current electricity consumption data includes at least the current electricity consumption.

[0072] In this specific embodiment, step S3 includes:

[0073] According to

[0074] W = P×Δt×λ

[0075] Obtain the actual electricity consumption; where W is the actual electricity consumption, P is the current electricity consumption power, Δt is the acquisition time interval of the mutual inductor, P×Δt is the current electricity consumption, and λ is the electricity consumption compensation coefficient.

[0076] It should be noted that the embodiments of the present invention mainly compensate the electricity consumption to make the compensated electricity consumption close to the actual electricity consumption, thereby improving the measurement accuracy.

[0077] Step S4: Control to send the actual electricity consumption and its corresponding watt-hour meter to the concentrator for data processing.

[0078] In this specific embodiment, after step S4, the method further includes:

[0079] Control the concentrator to upload the processed corresponding data of each watt-hour meter to the master station.

[0080] Based on the relationship that the phase difference between the current and voltage of the mutual inductor in the watt-hour meter affects the electricity consumption compensation, the embodiments of the present invention obtain the phase difference-compensation coefficient functional relationship; then obtain the first phase difference between the current phase and the current voltage phase in the watt-hour meter, and according to the first phase difference and the phase difference-compensation coefficient functional relationship, obtain the electricity consumption compensation coefficient corresponding to the first phase difference. Compensate the current electricity consumption through the electricity consumption compensation coefficient to make the compensated electricity consumption closer to the actual electricity consumption, thereby improving the measurement circuit accuracy.

[0081] In the embodiments of the present invention, the acquisition time intervals of the current transformer and the voltage transformer are obtained through the amplitude changes of two adjacent current phases and the amplitude changes of two adjacent voltage phases, and then the acquisition times of the two are synchronized, effectively solving the problem of deviation in the acquisition time intervals of the current transformer and the voltage transformer due to various factors, thereby improving the accuracy of the measurement circuit.

[0082] In the embodiments of the present invention, the electrical load data on the primary and secondary sides of the energy meter transformer can be collected, and the corresponding functional relationship is fitted and compared with the standard functional relationship to obtain the part of the transformer that needs parameter compensation, and then the corresponding automatic compensation is made. Based on this, the embodiments of the present invention can effectively distinguish the reasons for the error of the energy meter, make targeted compensation for the load resistance and magnetic permeability, make the compensation more accurate, and thus improve the measurement accuracy of the compensated energy meter. Therefore, according to the differences in the measurement circuits of each main board in the energy meter, the embodiments of the present invention provide differentiated compensation, so that when mass-produced, the compensation values of each main board are personalized and adapted, improving the measurement accuracy of each energy meter at the time of leaving the factory.

[0083] In summary, the embodiments of the present invention can effectively improve the accuracy of the measurement circuit, and thus obtain more accurate measurement data.

[0084] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

[0085] Each embodiment in this specification is described in a related manner. The same or similar parts between the embodiments can be referred to each other, and the differences between each embodiment and other embodiments are emphasized. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the related parts can be referred to the partial description of the method embodiment.

[0086] The above are only the preferred embodiments of the present invention, and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A method for improving the accuracy of measurement circuit based on intelligent fusion terminal, concentrator and electric energy meter, characterized in that: The method comprises: Step S1, controlling the intelligent fusion terminal to obtain the current power consumption data, current current phase data and current voltage phase data in the corresponding subordinate electric energy meter; wherein one of the intelligent fusion terminals is connected to at least one subordinate electric energy meter, and the intelligent fusion terminal is connected to the corresponding concentrator; Step S2, obtaining a first phase difference between current and voltage in the electric energy meter according to the current current phase data and the current voltage phase data; obtaining an electricity consumption compensation coefficient corresponding to the first phase difference according to the first phase difference and the phase difference-compensation coefficient functional relationship; wherein the electricity consumption compensation coefficient changes according to the first phase difference, and the phase difference-compensation coefficient functional relationship is a functional relationship between the first phase difference and the electricity consumption compensation coefficient; Step S3: compensating the current power consumption data according to the power consumption compensation coefficient to obtain the actual power consumption; wherein the current power consumption data at least includes the current power consumption; Step S4: Control the sending of the actual power consumption and the corresponding power meter to the concentrator for data processing.

2. The method for improving the accuracy of the measurement circuit based on the intelligent fusion terminal, concentrator and electric energy meter according to claim 1 is characterized in that: After step S1, the method further includes: Acquire a current current phase and a current voltage phase from the current current phase data and the current voltage phase data; Acquire the previous current phase data and the previous voltage phase data corresponding to the current current phase data and the current voltage phase data; obtain the previous current phase and the previous voltage phase according to the previous current phase data and the previous voltage phase data; According to the current current phase and the previous current phase, a current phase change amplitude is obtained; according to the current voltage phase and the previous voltage phase, a voltage phase change amplitude is obtained; A transformer synchronization instruction is generated according to the current phase change amplitude and the voltage phase change amplitude; wherein the transformer synchronization instruction is used to synchronize the acquisition time of the current transformer and the voltage transformer in the electric energy meter.

3. The method for improving the accuracy of measurement circuit based on intelligent fusion terminal, concentrator and electric energy meter according to claim 1 is characterized in that: The step of obtaining the phase difference-compensation coefficient functional relationship comprises: Adjusting the phase difference between the current transformer and the voltage transformer in the electric energy meter to the experimental phase difference; Applying a known experimental current and an experimental voltage to the electric energy meter, and collecting the measured current and the measured voltage of the secondary side corresponding to the current transformer and the voltage transformer; Obtaining an electricity consumption compensation coefficient corresponding to the experimental phase difference according to the experimental current, the experimental voltage, the measured current and the measured voltage; Repeat the above steps to obtain the power consumption compensation coefficient corresponding to each different experimental phase difference, and then obtain the phase difference-compensation coefficient function relationship.

4. The method for improving the accuracy of measurement circuit based on intelligent fusion terminal, concentrator and electric energy meter according to claim 1 is characterized in that: The step S3 comprises: according to W=P×Δt×λ The actual power consumption is obtained; wherein W is the actual power consumption, P is the current power consumption, Δt is the transformer collection time interval, P×Δt is the current power consumption, and λ is the power consumption compensation coefficient.

5. The method for improving the accuracy of measurement circuit based on intelligent fusion terminal, concentrator and electric energy meter according to claim 1 is characterized in that: In step S1, the method further includes: The intelligent fusion terminal is controlled to filter the total power consumption data of the electric energy meter; wherein the total power consumption data includes the current power consumption data, the current current phase data and the current voltage phase data.

6. The method for improving the accuracy of measurement circuit based on intelligent fusion terminal, concentrator and electric energy meter according to claim 1 is characterized in that: After step S1, the method further includes: According to the current power consumption data, the current current phase data and the current voltage phase data, it is determined whether the electric energy meter is abnormal; if so, a maintenance report instruction is sent to the concentrator; if not, normal operation is performed.

7. The method for improving the accuracy of measurement circuit based on intelligent fusion terminal, concentrator and electric energy meter according to claim 1 is characterized in that: Before step S1, the method further includes: Applying a plurality of corresponding standard electric loads to the primary side of the mutual inductor of the electric energy meter, and collecting the corresponding measured electric loads on the secondary side to obtain a plurality of data groups; wherein the data group includes a pair of corresponding standard electric loads and measured electric loads, and the electric loads include current and voltage; Fitting the data group to obtain a first fitting function relationship in which the secondary side electric load follows the change of the primary side electric load; wherein the first fitting function relationship includes a head nonlinear region, a middle linear region, and a tail nonlinear region; The first fitting function relationship is compared with the standard function relationship. In response to the first fitting function and the standard function relationship being completely matched, it is determined that the electric energy meter does not need parameter compensation. In response to the mismatch between the middle linear region and the standard function relationship, it is determined that the load resistance of the transformer has a deviation, and the load resistance is compensated for the resistance deviation parameter according to the middle linear region and the standard function relationship. In response to the mismatch between the head nonlinear region and the tail nonlinear region and the standard function relationship, it is determined that the magnetic permeability of the transformer has a deviation, and the magnetic permeability deviation parameter is compensated according to the head nonlinear region and / or the tail nonlinear region.

8. The method for improving the accuracy of measurement circuit based on intelligent fusion terminal, concentrator and electric energy meter according to claim 1 is characterized in that: After step S4, the method further includes: The concentrator is controlled to upload the processed corresponding data of each of the electric energy meters to the main station.

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