Automatic parameter compensation device for electric energy meter

Abstract

The invention discloses an automatic parameter compensation device for an electric energy meter, and the device comprises a parameter collection module which is used for applying a plurality of corresponding standard currents and / or standard voltages to the primary side of a current transformer and / or a voltage transformer of the electric energy meter, and collecting the corresponding measurement currents and / or measurement voltages of the secondary side, obtaining a plurality of data groups; the function fitting module is used for fitting the data set to obtain a first fitting function relation that the secondary side electrical parameters change along with the primary side electrical parameters; the compensation judgment module is used for comparing the first fitting function relation with a standard function relation and judging whether the load resistance and / or the magnetic conductivity of the mutual inductor need to be compensated or not; the first compensation working module is used for carrying out resistance deviation parameter compensation on the load resistor; and the second compensation working module is used for performing magnetic conductivity deviation parameter compensation on the magnetic conductivity. Parameter compensation can be automatically carried out on the electric energy meter, and the measurement accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the field of electric energy meter compensation, and particularly to an automatic parameter compensation device for an electric energy meter. Background Art

[0002] An electric energy meter is an instrument used to measure electric energy, also known as a watt-hour meter, a kilowatt-hour meter, or a meter for measuring various electrical quantities. Electric energy meters play a crucial role in the power system. Their uses are not limited to measuring electric energy consumption and electricity bill settlement, but also involve multiple aspects such as power management, energy auditing, distributed energy system monitoring, smart grid construction, and environmental protection and sustainable development.

[0003] During the manufacturing process of an electric energy meter, the electric energy meter may have a problem of insufficient accuracy due to some deviations in the manufacturing process. Among them, the load resistance deviation and magnetic permeability difference of the mutual inductor (current mutual inductor and voltage mutual inductor) result in inconsistent small current / large current responses, which will affect the measurement accuracy of the electric energy during factory production. 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 an automatic parameter compensation device for an electric energy meter, aiming to automatically compensate the parameters of the electric energy meter and improve its measurement accuracy.

[0005] To achieve the above object, the present invention provides an automatic parameter compensation device for an electric energy meter, which includes: a parameter acquisition module, a function fitting module, a compensation judgment module, a first compensation module, and a second compensation module;

[0006] The parameter acquisition module is used to apply a plurality of corresponding standard currents and / or standard voltages to the primary side of the current mutual inductor and / or voltage mutual inductor of the electric energy meter, and collect the corresponding measured currents and / or measured voltages on the secondary side to obtain a plurality of data groups; wherein, each data group includes a pair of corresponding standard current and measured current or a pair of corresponding standard voltage and measured voltage;

[0007] The function fitting module is used to fit the data groups to obtain a first fitting function relationship between the secondary-side electrical parameters and the primary-side electrical parameters; wherein, the electrical parameters include current and voltage, and the first fitting function relationship includes a head non-linear region, a middle linear region, and a tail non-linear region;

[0008] The compensation judgment module is used to 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 watt-hour 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 the load resistance of the current transformer has a deviation, and the first compensation module is enabled to work. 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 the magnetic permeability of the current transformer has a deviation, and the second compensation module is enabled to work;

[0009] The first compensation working module is used to perform resistance deviation parameter compensation on the load resistance according to the middle linear region and the standard function relationship;

[0010] The second compensation working module is used to perform magnetic permeability deviation parameter compensation on the magnetic permeability according to the head non-linear region and / or the tail non-linear region.

[0011] Optionally, the compensation judgment module is specifically used for:

[0012] Compare the first fitting function relationship with the standard function relationship; wherein, the standard function relationship includes a head standard non-linear region, a middle standard linear region, and a tail standard non-linear region;

[0013] In response to the complete match between the first fitting function and the standard function relationship, it is determined that the watt-hour meter does not require parameter compensation;

[0014] In response to a difference between the middle linear region and the middle standard linear region, the middle linear region does not match the standard function relationship, it is determined that the load resistance of the current transformer has a deviation, and the first compensation module is enabled to work;

[0015] In response to the first region range corresponding to the head non-linear region and the tail non-linear region being different from the standard region range corresponding to the head standard non-linear region and the tail standard non-linear region, the head non-linear region and the tail non-linear region do not match the standard function relationship, it is determined that the magnetic permeability of the current transformer has a deviation, and the second compensation module is enabled to work.

[0016] Optionally, the first compensation working module is specifically used for:

[0017] Obtain the standard load resistance according to the standard function relationship; obtain the actual load resistance according to the middle linear region;

[0018] Perform resistance deviation parameter compensation on the load resistance according to the standard load resistance and the actual load resistance.

[0019] Optionally, the second compensation working module includes a magnetoresistance obtaining sub-module and a permeability compensation sub-module;

[0020] The magnetoresistance obtaining sub-module is configured to obtain the magnetoresistance of the mutual inductor according to the specific values of the data set corresponding to the head non-linear region and / or the tail non-linear region;

[0021] The permeability compensation sub-module is configured to obtain the actual permeability of the mutual inductor according to the magnetoresistance; and compensate the permeability with a permeability deviation parameter according to the actual permeability.

[0022] Optionally, the magnetoresistance obtaining sub-module is specifically configured to:

[0023] When the mutual inductor is the current mutual inductor, according to

[0024]

[0025] obtain the magnetoresistance; where I1 is the standard current, I2 is the corresponding measured current, N1 is the number of primary turns, N2 is the number of secondary turns, R m is the magnetoresistance, Z b is the resistive load of the current mutual inductor, w is the power supply angular frequency, and j is the imaginary unit of the power supply angular frequency;

[0026] When the mutual inductor is the voltage mutual inductor, according to

[0027]

[0028] obtain the magnetoresistance; where V1 is the standard voltage, V2 is the corresponding measured current, N1 is the number of primary turns, N2 is the number of secondary turns, R m is the magnetoresistance, Z b is the resistive load of the voltage mutual inductor, w is the power supply angular frequency, j is the imaginary unit of the power supply angular frequency, and L m is the exciting inductance.

[0029] Optionally, the permeability compensation sub-module is specifically configured to:

[0030] According to

[0031]

[0032] obtain the actual permeability of the mutual inductor; where R m is the magnetoresistance, l is the magnetic path length of the mutual inductor, A is the cross-sectional area of the magnetic core of the mutual inductor, μ is the actual permeability,

[0033] Compensate the permeability with a permeability deviation parameter according to the actual permeability.

[0034] Optionally, the parameter acquisition module is specifically configured to:

[0035] Apply the standard current or the standard voltage corresponding to the intermediate range to the current transformer or the voltage transformer, and acquire the corresponding measured current or the measured voltage; take two points on both sides of the intermediate range, apply the corresponding standard current or the standard voltage, and acquire the corresponding measured current or the measured voltage, so that these three pieces of data form a first linear relationship;

[0036] Then take two more points outward, apply the corresponding standard current or the standard voltage, acquire the corresponding measured current or the measured voltage, and determine whether the corresponding data set is on the first linear relationship. If not, determine the area between this point and the nearest point as the high-frequency sampling area for sampling at the first frequency, and determine the area corresponding to the first linear relationship as the low-frequency sampling area for sampling at the second frequency; if so, repeat this operation until the newly added data set is not on the first linear relationship; where the first frequency is greater than the second frequency.

[0037] Optionally, the automatic parameter compensation device for the electric energy meter further includes: an inspection module;

[0038] The inspection module is configured to apply an inspection current and / or an inspection voltage to the primary side of the current transformer and / or the voltage transformer of the compensated electric energy meter, and acquire the corresponding first current and / or first voltage on the secondary side; in response to the first current and / or the first voltage satisfying the standard functional relationship, determine that the compensation of the electric energy meter is completed.

[0039] Advantages of the present invention: 1. The present invention acquires the electrical parameter data of the primary side and the secondary side of the electric energy meter transformer, fits the corresponding functional relationship and compares it with the standard functional relationship to obtain the part that needs to be parameter-compensated for the transformer, and then makes 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 permeability, make the compensation more accurate, and thus improve the measurement accuracy of the compensated electric energy meter. 2. Since the linear region is regular, it is easy to obtain an accurate linear relationship through several pieces of data, while the non-linear region is irregular and more data needs to be collected to make the fitting function closer to the actual function. Therefore, the acquisition module of the present invention performs low-frequency acquisition on the linear region and high-frequency acquisition on the non-linear region. This can not only reduce the acquisition frequency and the workload, but also ensure the accuracy of the fitting function.

[0040] In summary, 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 value of each main board can be personalized and adapted, improving the measurement accuracy of each electric energy meter at the time of leaving the factory. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a schematic structural diagram of an automatic parameter compensation device for an electric energy meter provided by a specific embodiment of the present invention;

[0042] Figure 2 is a schematic diagram for explaining the first fitting function relationship provided by a specific embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] The present invention discloses an automatic parameter compensation device for an electric energy 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. It is obvious that relevant personnel can 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.

[0044] After research by the applicant, it is found that: during the process of the electric energy meter leaving the factory, the electric energy meter may have problems with insufficient accuracy due to some deviations in the manufacturing process. Among them, the load resistance deviation and magnetic permeability difference of the mutual inductor (current mutual inductor and voltage mutual inductor) result in inconsistent small current / large current responses, which will affect the measurement accuracy of the electric energy leaving the factory. The primary side electrical parameters and secondary side electrical parameters of the mutual inductor are not always linear, and there is a non-linear relationship between them. When the current is small, the magnetic core works in the low magnetic field region, and the magnetic permeability dispersion causes insufficient induced electromotive force, resulting in a non-linear relationship between the primary side electrical parameters and secondary side electrical parameters when the current is less than a certain value; when the current is large, the magnetic core approaches saturation, resulting in non-linear growth of the secondary side current. The size of the region corresponding to the non-linear relationship at both ends is related to the magnetic permeability. Making corresponding resistance compensation and magnetic permeability compensation for the mutual inductor can effectively improve the accuracy of the electric energy meter.

[0045] Therefore, an embodiment of the present invention provides an automatic parameter compensation device for an electric energy meter, as Figure 1 shown, the automatic parameter compensation device for the electric energy meter includes: a parameter acquisition module 101, a function fitting module 102, a compensation judgment module 103, a first compensation module 104, and a second compensation module 105;

[0046] The parameter acquisition module 101 is configured to apply a plurality of corresponding standard currents and / or standard voltages to the primary side of the current transformer and / or voltage transformer of the watt-hour meter, and collect the corresponding measured currents and / or measured voltages on the secondary side to obtain a plurality of data sets; wherein, a data set includes a pair of corresponding standard current and measured current or a pair of corresponding standard voltage and measured voltage;

[0047] The function fitting module 102 is configured to fit the data sets to obtain a first fitting function relationship in which the secondary-side electrical parameters follow the primary-side electrical parameters; wherein, the electrical parameters include current and voltage, and the first fitting function relationship includes a head non-linear region, a middle linear region, and a tail non-linear region;

[0048] The compensation judgment module 103 is configured to 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 watt-hour 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 the load resistance of the transformer is deviated, and the first compensation module 104 is made to work; 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 the magnetic permeability of the transformer is deviated, and the second compensation module 105 is made to work;

[0049] The first compensation working module is configured to perform resistance deviation parameter compensation on the load resistance according to the middle linear region and the standard function relationship;

[0050] The second compensation working module is configured to perform magnetic permeability deviation parameter compensation on the magnetic permeability according to the head non-linear region and / or the tail non-linear region.

[0051] It should be noted that the non-linear error of the transformer is caused by the difference in the magnetic permeability of its magnetic core, resulting in inconsistent responses for small currents / large currents. Specifically, when the current is small, the magnetic core operates in the low magnetic field region, and the dispersion of the magnetic permeability leads to insufficient induced electromotive force. The relationship between the primary-side electrical parameters and the secondary-side electrical parameters is not linear; when the current is large, the magnetic core approaches saturation, resulting in non-linear growth of the secondary-side current. Therefore, affected by the magnetic permeability, the linear relationship cannot be directly used to convert the primary-side electrical parameters into secondary-side electrical parameters at small currents and large currents. A specifically corresponding function relationship needs to be used for conversion. And the range of small currents and large currents is determined by the magnetic permeability. The range of small currents and large currents can be obtained based on the magnetic permeability.

[0052] In this specific embodiment, the first fitting function relationship corresponding to the current transformer can be as Figure 2 shown. Figure 2It is only noted for illustration that the first fitting function relationship has two non-linear regions at the head and tail and a linear region in the middle, and the actual image is related to the specific values of the turn ratio and magnetic permeability. Similar to the first fitting function relationship, current transformers will have linear and non-linear regions due to the influence of their magnetic permeability, except that the size of the non-linear region is related to the magnetic permeability.

[0053] Therefore, in the specific process of using the watt-hour meter, if the measured value is in the non-linear region, the function corresponding to the non-linear region needs to be specifically solved. If the measured value is in the linear region, the specific value can be directly obtained according to the linear relationship.

[0054] In this specific embodiment, the compensation judgment module 103 is specifically used for:

[0055] Compare the first fitting function relationship with the standard function relationship; wherein, the standard function relationship includes a head standard non-linear region, a middle standard linear region, and a tail standard non-linear region;

[0056] In response to the complete match between the first fitting function and the standard function relationship, it is determined that the watt-hour meter does not require parameter compensation;

[0057] In response to there being a difference between the middle linear region and the middle standard linear region, the middle linear region does not match the standard function relationship, it is determined that there is a deviation in the load resistance of the current transformer, and the first compensation module 104 is made to work;

[0058] In response to the first region ranges corresponding to the head non-linear region and the tail non-linear region being different from the standard region ranges corresponding to the head standard non-linear region and the tail standard non-linear region, the head non-linear region and the tail non-linear region do not match the standard function relationship, it is determined that there is a deviation in the magnetic permeability of the current transformer, and the second compensation module 105 is made to work.

[0059] It should be noted that through function comparison, it can be found whether the inaccuracy of the current transformer is caused by a deviation in the resistance load, a deviation in the magnetic permeability, or both. If there is a deviation in the resistance load, there will surely be a deviation in its linear region. If there is a deviation in the magnetic permeability, the coverage range of the non-linear region will also deviate. Based on this, the embodiment of the present invention determines whether the inaccuracy of the current transformer is caused by a deviation in the resistance load, a deviation in the magnetic permeability, or both.

[0060] In this specific embodiment, the first compensation working module is specifically used for:

[0061] Obtain the standard load resistance according to the standard function relationship; obtain the actual load resistance according to the middle linear region;

[0062] Perform resistance deviation parameter compensation on the load resistance according to the standard load resistance and the actual load resistance.

[0063] In this specific embodiment, compensation can be achieved by adjusting the linear relationship corresponding to the linear region of the standard function.

[0064] In another specific embodiment, compensation can be achieved by directly compensating for the resistance difference so that the standard load resistance and the actual load resistance are the same.

[0065] In this specific embodiment, the second compensation working module includes a magnetic resistance obtaining submodule and a magnetic permeability compensation submodule;

[0066] A magnetic resistance obtaining submodule, used to obtain the magnetic resistance of the mutual inductor according to specific values ​​of the data group corresponding to the head nonlinear region and / or the tail nonlinear region;

[0067] The magnetic permeability compensation submodule is used to obtain the actual magnetic permeability of the mutual inductor according to the magnetic resistance; and to compensate the magnetic permeability deviation parameter of the magnetic permeability according to the actual magnetic permeability.

[0068] Furthermore, the magnetic resistance acquisition submodule is specifically used for:

[0069] When the transformer is a current transformer, according to

[0070]

[0071] Obtain magnetic resistance; where I1 is the standard current, I2 is the corresponding measured current, N1 is the number of turns on the primary side, N2 is the number of turns on the secondary side, and R m is the magnetic resistance, Z b is the resistance load of the current transformer, w is the power supply angular frequency, j is the imaginary unit of the power supply angular frequency;

[0072] When the transformer is a voltage transformer, according to

[0073]

[0074] Obtain magnetic resistance; where V1 is the standard voltage, V2 is the corresponding measurement current, N1 is the number of turns on the primary side, N2 is the number of turns on the secondary side, and R m is the magnetic resistance, Z b is the resistance load of the voltage transformer, w is the power supply angular frequency, j is the imaginary unit of the power supply angular frequency, L m is the magnetizing inductance.

[0075] Furthermore, the magnetic permeability compensation submodule is specifically used for:

[0076] according to

[0077]

[0078] Get the actual magnetic permeability of the transformer; where R mR is the magnetoresistance, l is the magnetic path length of the mutual inductor, A is the cross-sectional area of the magnetic core of the mutual inductor, and μ is the actual magnetic permeability.

[0079] Perform magnetic permeability deviation parameter compensation on the magnetic permeability according to the actual magnetic permeability.

[0080] In this specific embodiment, by obtaining the magnetic permeability, obtaining the non-linear region range and its functional relationship of the non-linear region range according to the magnetic permeability, and using the non-linear region range and its functional relationship to adjust the linear region of the standard function, compensation is achieved.

[0081] In this specific embodiment, the parameter acquisition module 101 is specifically used for:

[0082] Apply the standard current or standard voltage corresponding to the intermediate range to the current transformer or voltage transformer, and collect the corresponding measured current or measured voltage; take two points on both sides of the intermediate range, apply the corresponding standard current or standard voltage, and collect the corresponding measured current or measured voltage, so that these three data form a first linear relationship.

[0083] Then take two more points outward, apply the corresponding standard current or standard voltage, collect the corresponding measured current or measured voltage, and determine whether the corresponding data group is on the first linear relationship. If not, determine the area between this point and the nearest point as the high-frequency sampling area for sampling at the first frequency, and determine the area corresponding to the first linear relationship as the low-frequency sampling area for sampling at the second frequency; if so, repeat this operation until the newly added data group is not on the first linear relationship; where the first frequency is greater than the second frequency.

[0084] It should be noted that to achieve the same fitting effect for the linear region and the non-linear region, the amount of data required is different. The linear region only needs very little data to achieve a high-precision fitting effect, while the non-linear region requires more data to achieve the same fitting effect. Therefore, the embodiment of the present invention adopts the above method to reduce the amount of data collected in the linear region while ensuring the fitting effect of the linear region, so as to reduce the burden. At the same time, increase the amount of data collected in the non-linear region to improve the fitting effect of the non-linear region.

[0085] In this specific embodiment, the automatic parameter compensation device for the electric energy meter further includes: an inspection module;

[0086] The inspection module is used to apply an inspection current and / or inspection voltage to the primary side of the current transformer and / or voltage transformer of the compensated electric energy meter, and collect the corresponding first current and / or first voltage on the secondary side; in response to the first current and / or first voltage satisfying the standard functional relationship, it is determined that the compensation of the electric energy meter is completed.

[0087] It should be noted that the calibration module can avoid inaccurate compensation.

[0088] In the embodiment of the present invention, by collecting the electrical parameter data of the primary side and the secondary side of the transformer of the electric energy meter, and fitting the corresponding functional relationship and comparing it with the standard functional relationship, the part of the transformer that needs parameter compensation can be obtained, and then corresponding automatic compensation is made. Based on this, the embodiment of 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 thus improve the measurement accuracy of the compensated electric energy meter.

[0089] Since the linear region is regular, it is easy to obtain an accurate linear relationship through a few data. The non-linear region is irregular and more data needs to be collected to make the fitting function closer to the actual function. Therefore, the acquisition module of the embodiment of the present invention performs low-frequency acquisition on the linear region and high-frequency acquisition on the non-linear region. This can not only reduce the acquisition frequency and the workload, but also ensure the accuracy of the fitting function.

[0090] In summary, the embodiment of the present invention provides differential compensation according to the differences in the measurement circuits of each main board in the electric energy meter, and can make the compensation value of each main board be personalized and adapted during mass production, so as to improve the measurement accuracy of the electric energy meter when it leaves the factory.

[0091] 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 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 in 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.

[0092] 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 description of the method embodiment.

[0093] The above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention are all included within the protection scope of the present invention.

Claims

1. An automatic parameter compensation device for an electric energy meter, characterized in that: The automatic parameter compensation device of the electric energy meter comprises: a parameter acquisition module, a function fitting module, a compensation judgment module, a first compensation module and a second compensation module; The parameter acquisition module is used to apply a plurality of corresponding standard currents and / or standard voltages to the primary side of the current transformer and / or voltage transformer of the electric energy meter, and collect the corresponding measured current and / or measured voltage on the secondary side to obtain a plurality of data groups; wherein the data group includes a pair of corresponding standard currents and measured currents or a pair of corresponding standard voltages and measured voltages; The function fitting module is used to fit the data group to obtain a first fitting function relationship in which the secondary side electrical parameter follows the change of the primary side electrical parameter; wherein the electrical parameters include current and voltage, and the first fitting function relationship includes a head nonlinear region, a middle linear region, and a tail nonlinear region; The compensation judgment module is used to compare the first fitting function relationship with the standard function relationship, and in response to the first fitting function and the standard function relationship being completely matched, it is judged that the electric energy meter does not need parameter compensation; in response to the middle linear region not matching the standard function relationship, it is judged that the load resistance of the mutual inductor has a deviation, and the first compensation module is operated; in response to the head nonlinear region and the tail nonlinear region not matching the standard function relationship, it is judged that the magnetic permeability of the mutual inductor has a deviation, and the second compensation module is operated; The first compensation working module is used to perform resistance deviation parameter compensation on the load resistance according to the relationship between the middle linear region and the standard function; The second compensation working module is used to perform magnetic permeability deviation parameter compensation on the magnetic permeability according to the head nonlinear region and / or the tail nonlinear region.

2. The automatic parameter compensation device for electric energy meters according to claim 1, characterized in that: The compensation judgment module is specifically used for: Comparing the first fitting function relationship with a standard function relationship; wherein the standard function relationship includes a head standard nonlinear region, a middle standard linear region and a tail standard nonlinear region; In response to the first fitting function and the standard function completely matching each other, determining that the electric energy meter does not need parameter compensation; In response to a difference between the middle linear region and the middle standard linear region, the middle linear region does not match the standard function relationship, determining that a load resistance of the mutual inductor has a deviation, and causing the first compensation module to operate; In response to the first area range corresponding to the head nonlinear area and the tail nonlinear area being different from the standard area range corresponding to the head standard nonlinear area and the tail standard nonlinear area, the head nonlinear area and the tail nonlinear area do not match the standard function relationship, and it is determined that the magnetic permeability of the mutual inductor deviates, so that the second compensation module is put into operation.

3. The automatic parameter compensation device for electric energy meters according to claim 1, characterized in that: The first compensation working module is specifically used for: According to the standard function relationship, the standard load resistance is obtained; according to the middle linear region, the actual load resistance is obtained; The load resistance is compensated for resistance deviation parameters according to the standard load resistance and the actual load resistance.

4. The automatic parameter compensation device for electric energy meters according to claim 1, characterized in that: The second compensation working module includes a magnetic resistance obtaining submodule and a magnetic permeability compensation submodule; The magnetic resistance obtaining submodule is used to obtain the magnetic resistance of the mutual inductor according to the specific values ​​of the data group corresponding to the head nonlinear region and / or the tail nonlinear region; The magnetic permeability compensation submodule is used to obtain the actual magnetic permeability of the mutual inductor according to the magnetic resistance; and perform magnetic permeability deviation parameter compensation on the magnetic permeability according to the actual magnetic permeability.

5. The automatic parameter compensation device for electric energy meters according to claim 4, characterized in that: The magnetic resistance obtaining submodule is specifically used for: When the transformer is the current transformer, according to Obtain the magnetic resistance; wherein I1 is the standard current, I2 is the corresponding measured current, N1 is the number of turns on the primary side, N2 is the number of turns on the secondary side, R m is the magnetic resistance, Z b is the resistance load of the current transformer, w is the power supply angular frequency, and j is the imaginary unit of the power supply angular frequency; When the transformer is the voltage transformer, according to Obtain the magnetic resistance; wherein V1 is the standard voltage, V2 is the corresponding measurement current, N1 is the number of turns on the primary side, N2 is the number of turns on the secondary side, R m is the magnetic resistance, Z b is the resistance load of the voltage transformer, ω is the power supply angular frequency, j is the imaginary unit of the power supply angular frequency, L m is the magnetizing inductance.

6. The automatic parameter compensation device for electric energy meters according to claim 4, characterized in that: The magnetic permeability compensation submodule is specifically used for: according to Obtain the actual magnetic permeability of the mutual inductor; wherein, R m is the magnetic resistance, l is the magnetic path length of the transformer, A is the core cross-sectional area of ​​the transformer, μ is the actual magnetic permeability, The magnetic permeability is compensated for by a magnetic permeability deviation parameter according to the actual magnetic permeability.

7. The automatic parameter compensation device for electric energy meters according to claim 1, characterized in that: The parameter acquisition module is specifically used for: Applying the standard current or the standard voltage corresponding to the middle range to the current transformer or the voltage transformer, and collecting the corresponding measured current or the measured voltage; taking two points on both sides of the middle range, applying the corresponding standard current or the standard voltage, and collecting the corresponding measured current or the measured voltage, so that the three data form a first linear relationship; Then take two more points outward, apply the corresponding standard current or the standard voltage, collect the corresponding measurement current or the measurement voltage, and determine whether the corresponding data group is in the first linear relationship. If not, determine the area between the point and the nearest point as the high-frequency sampling area for sampling at the first frequency, and determine the area corresponding to the first linear relationship as the low-frequency sampling area for sampling at the second frequency; if so, repeat the operation until the newly added data group is not in the first linear relationship; wherein the first frequency is greater than the second frequency.

8. The automatic parameter compensation device for electric energy meters according to claim 1, characterized in that: The automatic parameter compensation device for the electric energy meter further comprises: a testing module; The inspection module is used to apply an inspection current and / or an inspection voltage to the primary side of the current transformer and / or the voltage transformer of the compensated electric energy meter, and collect the first current and / or the first voltage corresponding to the secondary side; in response to the first current and / or the first voltage satisfying the standard functional relationship, it is determined that the compensation of the electric energy meter is completed.

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