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

Abstract

The application discloses a method for improving the precision of a measuring circuit based on an intelligent fusion terminal, a concentrator and an electric energy meter, and comprises the following steps: controlling the intelligent fusion terminal to acquire current power consumption data, current current phase data and current voltage phase data in the corresponding subordinate electric energy meter; obtaining a first phase difference between the current and the voltage in the electric energy meter according to the current current phase data and the current voltage phase data; obtaining a power consumption compensation coefficient corresponding to the first phase difference according to a functional relationship between the first phase difference and a phase difference-compensation coefficient; compensating the current power consumption data according to the power consumption compensation coefficient to obtain actual power consumption; and controlling the actual power consumption and the corresponding electric energy meter to be sent to the concentrator for data processing. The application compensates the power consumption to improve the precision of the measuring circuit.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric energy meter, in particular to a method for improving the precision of a measurement circuit based on a smart fusion terminal, concentrator and electric energy meter. BACKGROUND

[0002] The smart fusion terminal (SFT) and the concentrator play different but complementary roles in the power system, and together they constitute an "edge-aggregation" collaborative architecture, supporting the intelligent management of distribution networks and efficient data transmission. The smart fusion terminal is usually deployed at the user side or the distribution transformer side, as an edge computing device, integrating data acquisition, local control, communication and other functions. For example, for low-voltage power distribution monitoring, distributed energy access (such as photovoltaic), demand response and other scenarios. The concentrator is an intermediate layer device at the distribution side or the main station side, responsible for aggregating data from multiple SFTs or smart meters, and uploading to the main station system through remote communication (such as optical fiber, 4G / 5G). The concentrator is usually installed near the distribution room, substation or transformer station.

[0003] However, in the power system composed of smart fusion terminals, concentrators and electric energy meters, the measurement accuracy often decreases. The phase shift introduced by the inductance and resistance of the current transformer (CT) and voltage transformer (PT) in the electric energy meter is one of the reasons for the decrease in measurement circuit accuracy. Because the phase shift of CT / PT will cause power factor measurement error, and thus reduce the measurement accuracy. SUMMARY

[0004] In view of the above part of the defects of the prior art, the technical problem to be solved by the present application is to provide a method for improving the precision of a measurement circuit based on a smart fusion terminal, concentrator and electric energy meter, which aims to improve the precision of the measurement circuit by compensating for the power consumption.

[0005] To achieve the above-mentioned purpose, the present application provides a method for improving the precision of a measurement circuit based on a smart fusion terminal, concentrator and electric energy meter, which comprises:

[0006] Step S1, control the smart fusion terminal to obtain the current power consumption data, the current current phase data and the current voltage phase data in the corresponding subordinate electric energy meter; wherein one smart fusion terminal is connected to at least one subordinate electric energy meter, and the smart fusion terminal is connected to the corresponding concentrator;

[0007] In step S2, a first phase difference between the current and the voltage in the electric energy meter is obtained according to the current phase data and the voltage phase data; and a power consumption compensation coefficient corresponding to the first phase difference is obtained according to the first phase difference and a phase difference-compensation coefficient function relationship; wherein the power consumption compensation coefficient changes according to the first phase difference, and the phase difference-compensation coefficient function relationship is a function relationship between the first phase difference and the power consumption compensation coefficient.

[0008] In step S3, the current power consumption data is compensated according to the power consumption compensation coefficient, and the actual power consumption is obtained; wherein the current power consumption data at least includes the current power consumption.

[0009] In step S4, the actual power consumption and the corresponding electric energy meter are sent to the concentrator for data processing.

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

[0011] The current current phase and the current voltage phase in the current current phase data and the current voltage phase data are obtained.

[0012] The previous current phase data and the previous voltage phase data corresponding to the current current phase data and the current voltage phase data are obtained; and a previous current phase and a previous voltage phase are obtained according to the previous current phase data and the previous voltage phase data.

[0013] A current phase change amplitude is obtained according to the current current phase and the previous current phase; and a voltage phase change amplitude is obtained according to the current voltage phase and the previous voltage phase.

[0014] A mutual inductor synchronization instruction is generated according to the current phase change amplitude and the voltage phase change amplitude; wherein the mutual inductor synchronization instruction is used to synchronize the collection time of the current mutual inductor and the voltage mutual inductor in the electric energy meter.

[0015] Optionally, the obtaining step of the phase difference-compensation coefficient function relationship comprises:

[0016] The phase difference between the current mutual inductor and the voltage mutual inductor in the electric energy meter is adjusted to an experimental phase difference;

[0017] A known experimental current and an experimental voltage are applied to the electric energy meter, and a measured current and a measured voltage on the secondary side corresponding to the current mutual inductor and the voltage mutual inductor are collected;

[0018] A power consumption compensation coefficient corresponding to the experimental phase difference is obtained according to the experimental current, the experimental voltage, the measured current and the measured voltage.

[0019] The above steps are repeated to obtain the power consumption compensation coefficient corresponding to each different phase difference, and then the phase difference-compensation coefficient function relationship is obtained.

[0020] Optionally, the step S3 comprises:

[0021] According to

[0022] W=P*Δt*λ

[0023] The actual power consumption is obtained; wherein, W is the actual power consumption, P is the current power consumption, Δt is the time interval of the mutual inductor collection, P*Δt is the current power consumption, and λ is the power consumption compensation coefficient.

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

[0025] The intelligent fusion terminal is controlled to filter the total power consumption data of the electric energy meter; wherein, the total power consumption data comprises the current power consumption data, the current current phase data, and the current voltage phase data.

[0026] Optionally, the method further comprises:

[0027] 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 yes, a maintenance report instruction is sent to the concentrator, and if no, normal work is performed.

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

[0029] A plurality of corresponding standard electrical loads are applied to the primary side of the mutual inductor of the electric energy meter, and corresponding measurement electrical loads on the secondary side are collected to obtain a plurality of data groups; wherein, the data group comprises a pair of corresponding standard electrical loads and measurement electrical loads, and the electrical load comprises current and voltage;

[0030] The data groups are fitted to obtain a first fitting function relationship that the secondary side electrical load follows the change of the primary side electrical load; wherein, the first fitting function relationship comprises a head nonlinear region, a middle linear region, and a tail nonlinear region.

[0031] The first fitted function relationship is compared with the standard function relationship. If the first fitted function and the standard function relationship match perfectly, it is determined that the energy meter does not require parameter compensation. If the middle linear region does not match the standard function relationship, it is determined that the load resistance of the current transformer has deviated, and resistance deviation parameter compensation is performed on the load resistance according to the middle linear region and the standard function relationship. If the head nonlinear region and the tail nonlinear region do not match the standard function relationship, it is determined that the permeability of the current transformer has deviated, and permeability deviation parameter compensation is performed on the permeability according to the head nonlinear region and / or the tail nonlinear region.

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

[0033] The concentrator is controlled to upload the processed data corresponding to each of the electricity meters to the main station.

[0034] The beneficial effects of this invention are as follows: 1. This invention is based on the relationship between the phase difference of the current and voltage of the current transformer in the electricity meter and the impact on electricity consumption compensation, obtaining the phase difference-compensation coefficient function relationship; then, it obtains the first phase difference between the current phase and the current voltage phase in the electricity meter, and obtains the electricity consumption compensation coefficient corresponding to the first phase difference based on the first phase difference and the phase difference-compensation coefficient function relationship. The current electricity consumption is compensated using the electricity consumption compensation coefficient, so that the compensated electricity consumption is closer to the actual electricity consumption, thereby improving the accuracy of the measurement circuit. 2. This invention obtains the acquisition time interval of the current transformer and voltage transformer by using the amplitude of the change in two adjacent current phases and the amplitude of the change in two adjacent voltage phases, thereby synchronizing their acquisition time and effectively solving the problem of deviation in the acquisition time interval of the current transformer and voltage transformer caused by various factors, thus improving the accuracy of the measurement circuit. 3. This invention can collect the electrical load data of the primary and secondary sides of the current transformer in the electricity meter, fit the corresponding function relationship and compare it with the standard function relationship to obtain the part of the transformer that needs parameter compensation, and then make corresponding automatic compensation. Based on this, the present invention can effectively distinguish the causes of errors in electricity meters and make targeted compensations for load resistance and permeability, making the compensation more accurate and thus improving the measurement accuracy of the compensated electricity meter. Therefore, the present invention provides differentiated compensation based on the differences in the measurement circuit of each motherboard in the electricity meter, so that the compensation value of each motherboard can be personalized and adapted during mass production, improving the measurement accuracy of each electricity meter at the time of leaving the factory.

[0035] In summary, this invention can effectively improve the accuracy of the measurement circuit, thereby obtaining more accurate measurement data. Attached Figure Description

[0036] Figure 1This is a flowchart illustrating a method for improving the accuracy of measurement circuits based on a smart fusion terminal, concentrator, and energy meter, according to a specific embodiment of the present invention.

[0037] Figure 2 This is a schematic diagram illustrating the functional relationship between the phase difference between the secondary current and voltage of a current transformer according to a specific embodiment of the present invention. Detailed Implementation

[0038] This invention discloses a method for improving the accuracy of measurement circuits based on intelligent fusion terminals, concentrators, and energy meters. Those skilled in the art can refer to the content of this document and appropriately modify the technical details to implement it. It is particularly important to note that all similar substitutions and modifications are obvious to those skilled in the art and are considered to be included in this invention. The methods and applications of this invention have been described through preferred embodiments. Those skilled in the art can clearly modify or appropriately change and combine the methods and applications described herein without departing from the content, spirit, and scope of this invention to implement and apply the technology of this invention.

[0039] The applicant's research revealed that in power systems comprised of smart converged terminals, concentrators, and electricity meters, measurement accuracy often declines. One reason for this decline in accuracy is the phase shift introduced by the current transformers (CTs) and voltage transformers (PTs) in the electricity meters due to their inductive reactance and resistance. This phase shift in the CTs / PTs leads to errors in power factor measurement, thus reducing overall measurement accuracy.

[0040] Therefore, embodiments of the present invention provide a method for improving the accuracy of measurement circuits based on intelligent fusion terminals, concentrators, and energy meters, such as... Figure 1 As shown, the method includes:

[0041] Step S1: Control the intelligent fusion terminal to obtain the current electricity consumption data, current current phase data and current voltage phase data from its corresponding subordinate electricity meters.

[0042] Each smart converged terminal is connected to at least one subordinate electricity meter, and the smart converged terminal is connected to its corresponding concentrator.

[0043] In practical applications, the electricity meter is a subordinate device of the smart converged terminal, which in turn is a subordinate device of the concentrator. The smart converged terminal performs preliminary processing on the electricity meter data before sending it to the concentrator.

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

[0045] The intelligent fusion terminal controls the filtering of the total electricity consumption data from the electricity meter; the total electricity consumption data includes the current electricity consumption data, the current current phase data, and the current voltage phase data.

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

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

[0048] Retrieve the current current phase and current voltage phase from the current current phase data and 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; obtain the previous current phase and the previous voltage phase based on the previous current phase data and the previous voltage phase data.

[0050] The amplitude of the current phase change is obtained based on the current current phase and the previous current phase; the amplitude of the voltage phase change is obtained based on the current voltage phase and the previous voltage phase.

[0051] Based on the amplitude of the current phase change and the amplitude of the voltage phase change, a transformer synchronization command is generated; the transformer synchronization command is used to synchronize the acquisition time of the current transformer and the voltage transformer in the energy meter.

[0052] It should be noted that electricity meters typically employ both current transformers and voltage transformers, requiring consistent sampling intervals and timing points for accurate power measurement. However, in practical applications, various factors often cause deviations in the sampling intervals and timing points, significantly impacting the accuracy of power consumption measurements. This invention effectively utilizes the amplitude of current phase changes to obtain the current sampling time interval and the amplitude of voltage phase changes to obtain the voltage sampling time interval, synchronizing these two sampling time intervals. Only the sampling timing points need to be aligned. This embodiment resolves the issue of differing sampling times between the two transformers, thereby improving measurement accuracy.

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

[0054] Based on the current electricity consumption data, current current phase data, and current voltage phase data, determine whether the electricity meter is malfunctioning; if so, send a maintenance report command to the concentrator; otherwise, continue normal operation.

[0055] It should be noted that electricity usage data is interconnected. If any data point is abnormal, it is highly likely that there is a problem with the wiring or the electricity meter, requiring appropriate repairs. This embodiment can detect faults promptly, preventing further losses.

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

[0057] Multiple corresponding standard electrical loads are applied to the primary side of the current transformer of the energy meter, and the corresponding measuring electrical loads on the secondary side are collected to obtain multiple data sets; wherein, each data set includes a pair of corresponding standard electrical loads and measuring electrical loads, and the electrical loads include current and voltage;

[0058] The data set is fitted to obtain the first fitting function relationship between the secondary side electrical load and the primary side electrical load; wherein, the first fitting function relationship includes the head nonlinear region, the middle linear region and the tail nonlinear region.

[0059] The first fitted function relationship is compared with the standard function relationship. If the first fitted function and the standard function relationship match perfectly, it is determined that the energy meter does not require parameter compensation. If the relationship between the middle linear region and the standard function relationship does not match, it is determined that the load resistance of the current transformer has deviated, and resistance deviation parameter compensation is performed on the load resistance according to the relationship between the middle linear region and the standard function relationship. If the relationship between the head nonlinear region and the tail nonlinear region does not match the standard function relationship, it is determined that the permeability of the current transformer has deviated, and permeability deviation parameter compensation is performed on the permeability according to the head nonlinear region and / or the tail nonlinear region.

[0060] It should be noted that this embodiment can provide differentiated compensation for different problems of the electricity meter, so as to make the measurement of each electricity meter more accurate.

[0061] Step S2: Based on the current current phase data and the current voltage phase data, obtain the first phase difference between the current and voltage in the energy meter; based on the first phase difference and the phase difference-compensation coefficient function relationship, obtain the power consumption compensation coefficient corresponding to the first phase difference.

[0062] The power compensation coefficient varies according to the change of the first phase difference, and the phase difference-compensation coefficient functional relationship is the functional relationship between the first phase difference and the power compensation coefficient.

[0063] In this specific embodiment, the functional relationship between the first phase difference between the current and voltage in the energy meter can be shown as follows: Figure 2 As shown, the phase difference between the primary and secondary sides of the current transformer remains consistent.

[0064] In this specific embodiment, the step of obtaining the phase difference-compensation coefficient function relationship includes:

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

[0066] A known experimental current and experimental voltage are applied to the energy meter, and the measured current and measured voltage on the secondary side of the current transformer and voltage transformer are collected.

[0067] Based on the experimental current, experimental voltage, measured current, and measured voltage, obtain the power compensation coefficient corresponding to the experimental phase difference;

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

[0069] It should be noted that the applicant's research found that the phase difference between current and voltage affects power consumption compensation in a certain ratio. Therefore, a phase difference-compensation coefficient function relationship was established, and the larger the phase difference, the larger the power consumption compensation coefficient.

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

[0071] 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 power consumption, Δt is the data collection time interval of the current transformer, P×Δt is the current electricity consumption, and λ is the electricity compensation coefficient.

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

[0077] Step S4: The control sends the actual electricity consumption and its corresponding electricity meter to the concentrator for data processing.

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

[0079] The control concentrator uploads the processed data from each electricity meter to the main station.

[0080] This invention, in its embodiments, establishes a phase difference-compensation coefficient function relationship based on the influence of the phase difference between the current and voltage of the current transformer in an energy meter on energy consumption compensation. It then obtains the first phase difference between the current phase and the current voltage phase in the energy meter, and, according to the first phase difference and the phase difference-compensation coefficient function relationship, obtains the corresponding energy consumption compensation coefficient. The current energy consumption is compensated using this compensation coefficient to make the compensated energy consumption closer to the actual energy consumption, thereby improving the accuracy of the measurement circuit.

[0081] This invention obtains the acquisition time interval of the current transformer and the voltage transformer by using the amplitude of the phase change of two adjacent currents and the amplitude of the phase change of two adjacent voltages, and then synchronizes the acquisition time of the two transformers. This effectively solves the problem of deviation in the acquisition time interval of the current transformer and the voltage transformer caused by various factors, thereby improving the accuracy of the measurement circuit.

[0082] This invention can collect electrical load data from the primary and secondary sides of the current transformer in an energy meter, fit a corresponding functional relationship, and compare it with a standard functional relationship to determine the parameters that need compensation for the current transformer, and then perform corresponding automatic compensation. Based on this, this invention can effectively distinguish the causes of energy meter errors and make targeted compensations for load resistance and permeability, making the compensation more accurate and thus improving the measurement accuracy of the compensated energy meter. Therefore, this invention provides differentiated compensation based on the differences in the measurement circuit of each mainboard in the energy meter, enabling personalized adaptation of the compensation value for each mainboard during mass production, improving the measurement accuracy of each energy meter at the time of manufacture.

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

[0084] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0085] The various embodiments in this specification are described in a related manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0086] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A method for improving the accuracy of measurement circuits based on intelligent fusion terminals, concentrators, and energy meters, characterized in that, The method includes: Step S1: Control the smart fusion terminal to obtain the current electricity consumption data, current current phase data and current voltage phase data from its corresponding subordinate electricity meter; wherein, each smart fusion terminal is connected to at least one subordinate electricity meter, and the smart fusion terminal is connected to its corresponding concentrator; Step S2: Based on the current current phase data and the current voltage phase data, obtain the first phase difference between the current and voltage in the energy meter; based on the first phase difference and the phase difference-compensation coefficient function relationship, obtain the power consumption compensation coefficient corresponding to the first phase difference; wherein, the power 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 power consumption compensation coefficient; 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. Step S4: Control the actual electricity consumption and its corresponding electricity meter to send to the concentrator for data processing; Prior to step S1, the method further includes: Multiple corresponding standard electrical loads are applied to the primary side of the current transformer of the energy meter, and the corresponding measuring electrical loads on the secondary side are collected to obtain multiple data sets; wherein, the data set includes a pair of corresponding standard electrical loads and measuring electrical loads, and the electrical loads include current and voltage; The data set is fitted to obtain a first fitting function relationship in which the secondary side electrical load follows the change of the primary side electrical load; wherein, the first fitting function relationship includes a head nonlinear region, a middle linear region, and a tail nonlinear region. The first fitted function relationship is compared with the standard function relationship. If the first fitted function and the standard function relationship match perfectly, it is determined that the energy meter does not require parameter compensation. If the middle linear region does not match the standard function relationship, it is determined that the load resistance of the current transformer has deviated, and resistance deviation parameter compensation is performed on the load resistance according to the middle linear region and the standard function relationship. If the head nonlinear region and the tail nonlinear region do not match the standard function relationship, it is determined that the permeability of the current transformer has deviated, and permeability deviation parameter compensation is performed on the permeability according to the head nonlinear region and / or the tail nonlinear region.

2. The method for improving the accuracy of measurement circuits based on intelligent fusion terminals, concentrators, and energy meters according to claim 1, characterized in that, Following step S1, the method further includes: Obtain the current current phase and current voltage phase from the current current phase data and the current voltage phase data; 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 based on the previous current phase data and the previous voltage phase data; The amplitude of the current phase change is obtained based on the current current phase and the previous current phase; the amplitude of the voltage phase change is obtained based on the current voltage phase and the previous voltage phase. Based on the amplitude of the current phase change and the amplitude of the voltage phase change, a transformer synchronization command is generated; wherein, the transformer synchronization command is used to synchronize the acquisition time of the current transformer and the voltage transformer in the energy meter.

3. The method for improving the accuracy of measurement circuits based on intelligent fusion terminals, concentrators, and energy meters according to claim 1, characterized in that, The steps for obtaining the phase difference-compensation coefficient function relationship include: Adjust the phase difference between the current transformer and the voltage transformer in the energy meter to the experimental phase difference; A known experimental current and experimental voltage are applied to the energy meter, and the measured current and measured voltage on the secondary side of the current transformer and the voltage transformer are collected. Based on the experimental current, the experimental voltage, the measured current, and the measured voltage, the power compensation coefficient corresponding to the experimental phase difference is obtained. Repeat the above steps to obtain the power compensation coefficients 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 circuits based on intelligent fusion terminals, concentrators, and energy meters according to claim 1, characterized in that, Step S3 includes: according to The actual electricity consumption is obtained; wherein, The actual electricity consumption is... This represents the current power consumption. The time interval for data acquisition by the current transformer. The current electricity consumption is... The electricity compensation coefficient is mentioned above.

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

6. The method for improving the accuracy of measurement circuits based on intelligent fusion terminals, concentrators, and energy meters according to claim 1, characterized in that, After step S1, the method further includes: Based on the current electricity consumption data, the current current phase data, and the current voltage phase data, determine whether the electricity meter is malfunctioning; if so, send a maintenance report command to the concentrator; otherwise, continue normal operation.

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

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