CN114152812A - Error self-checking three-phase electric energy meter and measuring system and method thereof - Google Patents
Error self-checking three-phase electric energy meter and measuring system and method thereof Download PDFInfo
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Abstract
The invention discloses a three-phase electric energy meter with self-checking error and a measuring system and method thereof. The method comprises the steps of establishing a mathematical model by utilizing the electric energy conservation relation of an electric energy system, calculating electric energy measurement errors of electric energy sensing units respectively arranged on 1-to-2 pipelines of the single-phase three-way array structure electric energy sensor according to electric energy data detected by the electric energy shunting structure and the error reference standard device, compensating the newly measured electric energy data by utilizing the calculated errors, continuously and iteratively calculating the measurement errors of the electric energy sensing units, and obtaining error-free or equal error data of the single-phase three-way array structure electric energy sensor. The multiple collinearity influence on electric energy data calculation caused by the similarity of the habits of using electric energy by users is weakened, and the calculation efficiency and the calculation precision are improved.
Description
Technical Field
The invention belongs to the technical field of intelligent meter measurement, and particularly relates to a three-phase electric energy meter with self-checking error and a measurement system and method formed by the three-phase electric energy meter.
Background
At present, a large number of meters such as an electric meter, a water meter, a gas meter or other flow meters are used, and the flow rate error cannot be detected in a laboratory due to too large amount of usage in real life. There is a need to find techniques and methods for online detection of errors in these flow sensors;
for a mathematical algorithm, when a flow measurement system is large, a plurality of flow sensors are included in the flow measurement system, the multiple collinearity problem of flow meter data can be derived from the similarity of user flow consumption habits, and the calculation accuracy of the data calculation method is influenced.
Conventionally, flow sensors are installed on a pipeline or a node of a measured flow measurement system, and a flow at each point is measured, and it is necessary to separately verify a measurement error of each flow sensor. The problem that this kind of method brings is that the work load of flow sensor error check-up is huge, and the cost is too high.
In view of the above, overcoming the drawbacks of the prior art is an urgent problem in the art.
Disclosure of Invention
The invention provides an error self-checking three-phase electric energy meter and a measuring system and a method formed by the same, aiming at constructing an electric energy measuring system of any scale by the error self-checking three-phase electric energy meter, dividing an electric energy measuring system with a larger scale into a plurality of electric energy arrays with smaller scales by the error self-checking three-phase electric energy meter, wherein each electric energy array meets the relative energy conservation law, respectively calculating the error of a three-phase electric energy sensor in each electric energy array, weakening the multiple collinearity influence of electric energy data calculation caused by similar habits of using electric energy by users, improving the calculation efficiency and the calculation precision, and solving the technical problem of multiple collinearity of electric energy data.
In order to achieve the above object, in a first aspect, the present invention provides an error self-checking three-phase electric energy meter, which comprises three groups of 1-to-2 three-phase electric energy shunting structures, each of which constitutes a three-phase electric energy system conforming to the power conservation relation, wherein in each group of 1-to-2 three-phase electric energy shunting structures, 1 total and 2 branch pipelines are respectively provided with an electric energy sensing unit, the electric energy sensing unit comprises a master meter metering module, an electric energy metering module connected in series with the user electric energy meter, and an electric energy metering module connected in series with an adjacent user electric energy meter, an error reference standard device is respectively connected in series with any pipeline of each group of 1-to-2 three-phase electric energy shunting structures, a mathematical model is established according to the power conservation relation, and electric energy data collected by the electric energy sensing unit and the error reference standard device is utilized, the calculation of the measurement error of the electric energy sensing unit is completed, wherein the three-phase electric energy shunting structure comprises 3 sets of 1-2 single-phase three-way array structure electric energy sensors which are relatively independent and formed by independent A-phase, B-phase and C-phase single-phase electric energy sensing units under a 3-meter method electric energy measurement method; wherein, the electric energy sensing unit concrete expression is each single-phase electric energy sensing unit, and is specific:
establishing a mathematical model by utilizing the electric energy conservation relation of an electric energy system, calculating electric energy measurement errors of electric energy sensing units respectively arranged on 1-to-2 pipelines of the single-phase three-way array structure electric energy sensor according to electric energy data detected by the electric energy shunting structure and the error reference standard device, compensating the newly measured electric energy data by utilizing the calculated errors, continuously and iteratively calculating the measurement errors of the electric energy sensing units, and obtaining error-free or equal error data of the single-phase three-way array structure electric energy sensor;
the error self-checking three-phase electric energy meter is used for constructing an electric energy system with measurable electric energy errors, and the array layout of the electric energy system with measurable electric energy errors is completed in a mode of cascading the error self-checking three-phase electric energy meter.
Preferably, the electric energy meter body or the meter case of the error self-checking three-phase electric energy meter is provided with or reserved with the wiring terminal for the line access of the adjacent user electric energy meter, so that the line access of the adjacent user electric energy meter is facilitated.
Preferably, the connection terminal of the electric energy meter with the three-way array structure is connected with 1 user metering module of the electric energy meter of the user inside the electric energy meter body of the user, the connection terminal and the electric energy metering module on the line of the adjacent user electric energy meter connected with the connection terminal are in series connection, the electric energy on the same line is measured, and the quantity value transmission of the electric energy data is realized by reading, calculating and analyzing the electric energy data and the errors of the electric energy data of the adjacent user metering module in the electric energy meter body of the user and the electric energy metering module on the adjacent user electric energy meter on the same line.
In a second aspect, the present invention further provides an error self-calibration three-phase electric energy meter, where the error self-calibration three-phase electric energy meter specifically includes:
the single-phase error self-checking device is formed by respectively additionally arranging 1 single-phase error self-checking module with a three-way array structure on three phases of 1 traditional three-phase electric energy meter; the single-phase error self-checking module of each three-way array structure forms a single-phase electric energy system which accords with the electric energy conservation relation; wherein, single-phase electric energy sensing units are respectively arranged on 1 total single-phase pipeline and 2 branch single-phase pipelines, a mathematical model is established according to the conservation relation of electric energy by connecting a single-phase error reference standard device on any pipeline of each group of 1-to-2 three-phase electric energy shunt structure in series, the calculation of the measurement error of the single-phase electric energy sensing unit is completed by utilizing the electric energy data collected by the single-phase electric energy sensing unit and the single-phase error reference standard device, after the measurement error of the A, B, C three-phase single-phase electric energy sensing unit is respectively calculated, obtaining a phase-combining electric energy measurement error of the error self-checking three-phase electric energy meter through phase-combining calculation, compensating newly measured three-phase electric energy data by using the calculated phase-combining error, continuously and iteratively calculating and compensating the measurement error of the electric energy sensing unit, and obtaining error-free or equal error data of the error self-checking three-phase electric energy meter; or, the system consists of 3 single-phase electric energy sensors with a three-way array structure; each three-way array structure electric energy sensor forms a single-phase electric energy system which accords with the electric energy conservation relation; the method comprises the steps that 1 total single-phase pipeline and 2 branch single-phase pipelines are respectively provided with a single-phase electric energy sensing unit, any one single-phase electric energy sensing unit is selected as a single-phase error reference standard device, a mathematical model is established according to the conservation relation of electric energy, electric energy data collected by the single-phase electric energy sensing unit and the single-phase error reference standard device are used for respectively calculating A, B, C measurement errors of the three-phase single-phase electric energy sensing units, the phase-combining electric energy measurement error of the three-phase electric energy meter with the self-checking error is obtained through phase-combining calculation, the newly measured three-phase electric energy data are compensated through the calculated phase-combining error, the measurement errors of the electric energy sensing units are continuously calculated and compensated in an iterative mode, and error-free or equal error data of the three-phase electric energy meter with the self-checking error are obtained.
In a third aspect, the present invention further provides an electric energy measurement system formed by a three-phase electric energy meter with self-error calibration, where the electric energy measurement system provided with the three-phase electric energy meter with self-error calibration in the first or second aspect includes: at least two-stage error is from three-phase electric energy meter of check-up, wherein, each stage error is from three-phase electric energy meter of check-up, including one be located the master meter metering module of master pipeline and two be located the electric energy metering module that this user's electric energy meter of branch pipeline concatenated and the electric energy metering module that adjacent user's electric energy meter concatenated, it is specific:
in a single-phase three-way array structure electric energy sensor, the electric energy of a general meter metering module, an electric energy metering module connected in series with the user electric energy meter and the electric energy of an electric energy metering module connected in series with an adjacent user electric energy meter form a relative electric energy conservation relation;
aiming at the three-phase electric energy meter with the self-checking errors of two adjacent stages 1 to 2 in the same phase of electric energy, the electric energy sensing sub-meter unit positioned in a branch line in the three-phase electric energy meter with the self-checking errors of the 1 to 2 previous stage is an electric energy metering module for the electric energy meter of the user with the self-checking errors of the 1 to 2 next stage in the branch line in series connection, so that each adjacent user in the existing system to be measured completes electric energy data series connection through the electric energy sensor with the multi-stage three-way array structure.
Preferably, the electric energy data concatenation is completed by each adjacent user in the existing system to be measured through the electric energy sensor with the multistage three-way array structure, which specifically comprises:
the electric energy metering modules connected in series with the adjacent user electric energy meters of the branch pipelines in the electric energy sensor with the 1-in-2 three-way array structure at the upper stage are the same as the user lines detected by the electric energy metering modules connected in series with the user electric energy meters of the branch pipelines in the electric energy sensor with the 1-in-2 three-way array structure at the lower stage;
the electric energy metering modules connected in series with the adjacent user electric energy meters of the branch pipelines in the electric energy sensor with the next-stage 1-in-2 three-way array structure are the same as the user lines detected by the electric energy metering modules connected in series with the user electric energy meters of the branch pipelines in the electric energy sensor with the next-stage 1-in-2 three-way array structure;
by analogy, the setting of detecting the same user line exists through the electric energy metering modules in the electric energy sensors of the two adjacent stages of the three-way array structure with 1-to-2 division, so that the electric energy data series connection is realized; therefore, after the metering error of the electric energy metering modules in the electric energy sensor with the 1-to-2 three-way array structure of any level is calculated, the data after corresponding metering compensation is used as the known data for calculating the metering error of each electric energy metering module in the electric energy sensor with the 1-to-2 three-way array structure of the next level.
Preferably, the electric energy measurement system comprises n error self-checking three-phase electric energy meters, wherein each error self-checking three-phase electric energy meter is independent of each other, and is specific:
the electric energy measuring system also comprises an error reference standard device which is connected in series with any pipeline branch of any error self-checking three-phase electric energy meter of the n error self-checking three-phase electric energy meters.
Preferably, the electric energy measuring system adopts a 3-meter method electric energy metering method and comprises at least 3 single-phase error reference standard devices; 3 single-phase error reference standard devices are respectively connected in series on a branch path of any three-way array structure 3 single-phase electric energy sensors of the electric energy measuring system, specifically:
when the error reference standard device is arranged on a branch of the last stage 1-2 tee array, transmitting an error reference value in a mode of progressively calculating from a lower level to an upper level so as to calibrate the electric energy measuring system to obtain error-free data or equal error data;
when the error reference standard device is arranged on a branch of the three-way array of the top level 1-2, transmitting an error reference value in a mode of progressively calculating from the upper level to the lower level so as to calibrate the electric energy measuring system to obtain error-free data or equal error data;
when the error reference standard device is arranged on a branch of the three-way array of the middle stage 1-2, an error reference value is transmitted in a mode of progressive calculation from the middle stage to the upper stage and in a mode of progressive calculation from the middle stage to the lower stage so as to calibrate the electric energy measuring system and obtain error-free data or equal error data.
Preferably, the electric energy measuring system comprises a microprocessor and a data transmission module, the microprocessor is connected with each three-phase electric energy sensor, and the data transmission module is connected with the microprocessor and used for error edge calculation of the three-phase electric energy meter with self-checking errors and/or used for sending electric energy data collected from each three-phase electric energy sensor to the cloud server.
In a fourth aspect, the present invention further provides a measurement method of an electric energy measurement system composed of a three-phase electric energy meter with self-calibration error, where the measurement method includes:
an error reference standard device is appointed or established in the electric energy measuring system, and a reference error value is given to the error reference standard device;
acquiring original measurement data of three-phase error self-checking electric energy meters of all three-way array structures in the electric energy measurement system and electric energy sensors on all branches in the electric energy meters, and original measurement data of the error reference standard device;
aiming at the 1-to-2 three-way array where the error reference standard device is located, calculating to obtain a reference measurement error value of a total meter metering module in the 1-to-2 three-way array where the error reference standard device is located, an electric energy metering module connected in series with the user electric energy meter and an electric energy metering module connected in series with an adjacent user electric energy meter by using a mathematical model established by a relative electric energy conservation relation;
acquiring a three-phase electric energy meter with the error self-checking relation of 1 in the previous stage or the next stage of the three-phase electric energy meter with the calculated error self-checking relation of the reference measurement error value, and calculating the reference measurement error values of a master meter metering module in a corresponding 1 in 2 three-way array of the previous stage or the next stage, an electric energy metering module connected in series with the user electric energy meter and an electric energy metering module connected in series with an adjacent user electric energy meter by utilizing the relative electric energy conservation relation;
and calculating the reference measurement error value process of the three-phase electric energy sensor in the three-way array of 1 minute 2 by one or more times through the previous stage or the next stage, thereby obtaining the reference measurement error values of the total meter metering module of all three-way array structures, the electric energy metering module connected in series with the user electric energy meter and the electric energy metering module connected in series with the adjacent user electric energy meter in the electric energy measuring system, compensating the original measurement data according to the reference measurement error value of each error self-checking three-phase electric energy meter, and obtaining equal error data or error-free data.
Preferably, the compensating the raw measurement data according to the reference measurement error value of each electric energy sensing unit to obtain equal error data or error-free data includes:
compensating the corresponding original measurement data by using the reference measurement error value to obtain equal error data of the reference error value of each three-phase electric energy sensor relative to the error reference standard device; when a delta X deviation exists between a real error value and a reference error value of the error reference standard device, compensating equal error data of each corresponding three-phase electric energy sensor by utilizing the delta X deviation to obtain error-free data; alternatively, the first and second electrodes may be,
and directly calculating to obtain error-free data of the three-phase electric energy meter corresponding to each error self-check according to the real error value of the error reference standard device.
Preferably, the obtaining of the Δ X deviation between the real error value and the reference error value of the error reference standard device specifically includes:
taking down the three-phase electric energy sensor selected as the error reference standard device, and measuring the real error value of the taken-down three-phase electric energy sensor; and subtracting the reference error value of the selected three-phase electric energy sensor from the real error value of the taken-down three-phase electric energy sensor to obtain the delta X deviation.
Preferably, the error reference standard means and the assigned reference error value are determined as follows:
a three-phase electric energy sensor unit with a known real error value is connected in series to any pipeline branch of any error self-checking three-phase electric energy meter of the electric energy measuring system;
in the running process of the electric energy measuring system, respectively reading the electric energy data of the three-phase electric energy sensor unit with the known real error value and the electric energy data of the three-phase electric energy sensor on the selected branch, and calculating the real error value of the three-phase electric energy sensor on the selected branch;
and the three-phase electric energy sensor on the selected branch is used as an error reference standard device, and the real error value of each connected three-phase electric energy sensor in the electric energy measuring system is calculated by using the calculated real error value of the three-phase electric energy sensor on the selected branch.
Preferably, the error is referenced to a reference error value of a standard device, and includes:
in the electric energy measuring system, after any three-phase electric energy sensor is selected as an error reference standard device, a preset reference error value is matched with a measuring error of the error reference standard device, wherein the difference value between the preset reference error value of the error reference standard device and an actual error value of the error reference standard device is equal to the delta X deviation.
Preferably, the measurement method further includes:
after the original measurement data of the three-phase electric energy sensor are collected, determining the similar condition of each original measurement data;
if the similarity of at least two groups of original measurement data is larger than a preset similarity threshold, the measurement error of each three-phase electric energy sensor is calculated in a cascade mode in a grading calculation mode so as to check the original measurement data;
if the similarity of each group of original measurement data is smaller than a preset similarity threshold value, the three-phase electric energy sensor sub-meter in the last stage 1-to-2 tee array and the electric energy sensor general meter in the top stage 1-to-2 tee array are used for obtaining the measurement error of the corresponding three-phase electric energy sensor by utilizing the relative electric energy conservation relation so as to verify the original measurement data.
Preferably, after the layout of the three-way array in the electric energy system is completed, and the electric energy measurement error calculation of the three-phase electric energy sensor respectively arranged on the 1 total line and the 2 branch lines is completed, the error of the electric energy measurement device in the electric energy system on the corresponding line is continuously and iteratively calculated by using the measurement data obtained by revising the error in the three-way array.
Generally, compared with the prior art, the technical scheme of the invention has the following beneficial effects: the invention provides an error self-checking three-phase electric energy meter, a measuring system and a measuring method formed by the same, wherein the electric energy measuring system comprises at least two stages of error self-checking three-phase electric energy meters, the error self-checking three-phase electric energy meters can not only form an electric energy measuring system with any scale, but also divide an electric energy measuring system with a larger scale into a plurality of electric energy arrays with smaller scales through the error self-checking three-phase electric energy meters, each electric energy array meets the relative energy conservation law, the error of a three-phase electric energy sensor in each electric energy array is respectively calculated, the multiple collinearity influence of electric energy data calculation caused by similarity of habits of using electric energy by users is weakened, and the calculating efficiency and the calculating precision are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic structural diagram of a single-phase three-way array structure electric energy sensor in a three-phase electric energy meter with self-error checking provided by an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an electric energy measurement system formed by a three-phase electric energy meter with self-error calibration according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a circuit structure based on a sharing standard according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a measurement method of an electric energy measurement system composed of a three-phase electric energy meter with self-error calibration according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart of a first implementation manner of step 10 in FIG. 4 according to an embodiment of the present invention;
fig. 6 is a schematic flow chart of a second implementation manner of step 10 in fig. 4 according to an embodiment of the present invention;
fig. 7 is a schematic flowchart of a third implementation manner of step 10 in fig. 4 according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an error measurement apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The error reference standard device refers to a standard device used as an error reference standard, so that the determination error in the description refers to the standard device, and the electric energy data reported by the error reference standard device is used as the error reference standard for breaking the homogeneous equation in the calculation process. Whether using physical experimentation or mathematical calculation, the measurement of any one quantity is relative to a reference; the detection of any one measurement error is relative to an error reference, and the standard or data for the error reference is referred to as the error reference. For example, a "standard meter" in the experiment of error checking of the conventional electric energy meter is an error reference standard. When the error is calculated by using the electric energy data, the data error of the electric energy sensor used as the reference datum data is the error reference standard calculated at this time.
The equal error data according to the present invention means: for any sensor with errors, after the measurement error of the sensor is detected, the detected error value is used for carrying out error calibration processing on the original measurement data (the original measurement data has errors) of the sensor, and the errors of all the obtained calibrated electric energy data are equal to the errors caused by the detection error method. These calibrated power data are referred to as "equal error" data. The "equal error" is equal to the error value of the error reference standard itself (also described as Δ X deviation in embodiments of the invention). Under the concept of equal error, after error calibration processing, the measurement error of each electric energy data of the sensing system is the same. The equal error concept is an effective theory which is put forward by the inventor after years of research in the field of sensing systems.
The error-free data of the invention refers to: for any equal error data, when its "equal error" is measured and calibrated, the obtained data is the error-free data. Considering that it is theoretically impossible to have absolute error-free data, it can be said in other words that error-free data is data with no or negligible errors.
Example 1:
an error self-checking three-phase electric energy meter is disclosed, as shown in fig. 1, the error self-checking three-phase electric energy meter comprises three groups of 1-to-2 three-phase electric energy shunting structures, each electric energy shunting structure respectively forms a three-phase electric energy system according with the electric energy conservation relation, wherein in each group of 1-to-2 three-phase electric energy shunting structures, 1 total pipeline and 2 branch pipelines are respectively provided with an electric energy sensing unit, the electric energy sensing unit comprises a master meter metering module, an electric energy metering module connected in series with the user electric energy meter and an electric energy metering module connected in series with an adjacent user electric energy meter, an error reference standard device is respectively connected in series with any pipeline of each group of 1-to-2 three-phase electric energy shunting structures, a mathematical model is established according to the electric energy conservation relation, and the calculation of the measuring error of the electric energy sensing unit is completed by using the electric energy data collected by the electric energy sensing unit and the error reference standard device, the three-phase electric energy shunting structure is under a 3-meter method electric energy metering method and comprises 3 sets of 1-2 single-phase three-way array structure electric energy sensors which are relatively independent and formed by independent A-phase, B-phase and C-phase single-phase electric energy sensing units; wherein, the electric energy sensing unit concrete expression is each single-phase electric energy sensing unit, and is specific:
establishing a mathematical model by utilizing the electric energy conservation relation of an electric energy system, calculating electric energy measurement errors of electric energy sensing units respectively arranged on 1-to-2 pipelines of the single-phase three-way array structure electric energy sensor according to electric energy data detected by the electric energy shunting structure and the error reference standard device, compensating the newly measured electric energy data by utilizing the calculated errors, continuously and iteratively calculating the measurement errors of the electric energy sensing units, and obtaining error-free or equal error data of the single-phase three-way array structure electric energy sensor;
it is based on the principle that the measurement error of the electric energy sensing unit is continuously calculated in an iterative manner until the difference between the results of the calculated error values of the two times is smaller than a preset value (the preset value is obtained according to experience and test experiments, and is not specifically described here), and then the error-free or equal error value of each electric energy sensor in the single-phase three-way array structure electric energy sensor can be determined.
The error self-checking three-phase electric energy meter is used for constructing an electric energy system with measurable electric energy errors, and the array layout of the electric energy system with measurable electric energy errors is completed in a mode of cascading the error self-checking three-phase electric energy meter.
The embodiment of the invention provides an error self-checking three-phase electric energy meter, wherein the error self-checking three-phase electric energy meter can construct an electric energy measuring system of any scale, the electric energy measuring system with a large scale can be divided into a plurality of electric energy arrays with a small scale through the error self-checking three-phase electric energy meter, each electric energy array meets the relative energy conservation law, errors of three-phase electric energy sensors in each electric energy array are calculated respectively, multiple collinearity influences of electric energy data calculation caused by similar habits of using electric energy of users are weakened, and the calculation efficiency and the calculation precision are improved.
In combination with the embodiment of the present invention, there is an optimal extension scheme for a self-error-checking three-phase electric energy meter, which specifically includes:
the single-phase error self-checking device is formed by respectively additionally arranging 1 single-phase error self-checking module with a three-way array structure on three phases of 1 traditional three-phase electric energy meter; the single-phase error self-checking module of each three-way array structure forms a single-phase electric energy system which accords with the electric energy conservation relation; wherein, single-phase electric energy sensing units are respectively arranged on 1 total single-phase pipeline and 2 branch single-phase pipelines, a mathematical model is established according to the conservation relation of electric energy by connecting a single-phase error reference standard device on any pipeline of each group of 1-to-2 three-phase electric energy shunt structure in series, the calculation of the measurement error of the single-phase electric energy sensing unit is completed by utilizing the electric energy data collected by the single-phase electric energy sensing unit and the single-phase error reference standard device, after the measurement error of the A, B, C three-phase single-phase electric energy sensing unit is respectively calculated, obtaining a phase-combining electric energy measurement error of the error self-checking three-phase electric energy meter through phase-combining calculation, compensating newly measured three-phase electric energy data by using the calculated phase-combining error, continuously and iteratively calculating and compensating the measurement error of the electric energy sensing unit, and obtaining error-free or equal error data of the error self-checking three-phase electric energy meter; alternatively, the first and second electrodes may be,
the system consists of 3 single-phase electric energy sensors with a three-way array structure; each three-way array structure electric energy sensor forms a single-phase electric energy system which accords with the electric energy conservation relation; the method comprises the steps that 1 total single-phase pipeline and 2 branch single-phase pipelines are respectively provided with a single-phase electric energy sensing unit, any one single-phase electric energy sensing unit is selected as a single-phase error reference standard device, a mathematical model is established according to the conservation relation of electric energy, electric energy data collected by the single-phase electric energy sensing unit and the single-phase error reference standard device are used for respectively calculating A, B, C measurement errors of the three-phase single-phase electric energy sensing units, the phase-combining electric energy measurement error of the three-phase electric energy meter with the self-checking error is obtained through phase-combining calculation, the newly measured three-phase electric energy data are compensated through the calculated phase-combining error, the measurement errors of the electric energy sensing units are continuously calculated and compensated in an iterative mode, and error-free or equal error data of the three-phase electric energy meter with the self-checking error are obtained.
Example 2:
the invention also provides an electric energy measuring system consisting of the three-phase electric energy meter with self-checking error,
the electric energy measurement system comprises at least two stages of error self-checking three-phase electric energy meters, wherein each stage of error self-checking three-phase electric energy meter comprises a master meter metering module located in a master pipeline and two electric energy metering modules which are located in branch pipelines and connected in series with the user electric energy meter and electric energy metering modules which are adjacent to the user electric energy meter and connected in series, and the electric energy measurement system is specific:
in a single-phase three-way array structure electric energy sensor, the electric energy of a general meter metering module, an electric energy metering module connected in series with the user electric energy meter and the electric energy of an electric energy metering module connected in series with an adjacent user electric energy meter form a relative electric energy conservation relation;
aiming at the three-phase electric energy meter with the self-checking errors of two adjacent stages 1 to 2 in the same phase of electric energy, the electric energy sensing sub-meter unit positioned in a branch line in the three-phase electric energy meter with the self-checking errors of the 1 to 2 previous stage is an electric energy metering module for the electric energy meter of the user with the self-checking errors of the 1 to 2 next stage in the branch line in series connection, so that each adjacent user in the existing system to be measured completes electric energy data series connection through the electric energy sensor with the multi-stage three-way array structure.
The embodiment of the invention provides an electric energy measuring system consisting of a three-phase electric energy meter with self-error checking, wherein the three-phase electric energy meter with self-error checking can not only construct an electric energy measuring system of any scale, but also divide the electric energy measuring system with larger scale into a plurality of electric energy arrays with smaller scale through the three-phase electric energy meter with self-error checking, each electric energy array meets the law of relative energy conservation, the error of a three-phase electric energy sensor in each electric energy array is respectively calculated, multiple collinearity influences faced by electric energy data calculation caused by similar habits of using electric energy by users are weakened, and the calculation efficiency and the calculation precision are improved.
In combination with the embodiment of the present invention, there is an optimal extension scheme, where the electric energy data concatenation is completed by each adjacent user in the existing system to be measured through an electric energy sensor of a multi-stage three-way array structure, specifically:
the electric energy metering modules connected in series with the adjacent user electric energy meters of the branch pipelines in the electric energy sensor with the 1-in-2 three-way array structure at the upper stage are the same as the user lines detected by the electric energy metering modules connected in series with the user electric energy meters of the branch pipelines in the electric energy sensor with the 1-in-2 three-way array structure at the lower stage;
the electric energy metering modules connected in series with the adjacent user electric energy meters of the branch pipelines in the electric energy sensor with the next-stage 1-in-2 three-way array structure are the same as the user lines detected by the electric energy metering modules connected in series with the user electric energy meters of the branch pipelines in the electric energy sensor with the next-stage 1-in-2 three-way array structure;
by analogy, the setting of detecting the same user line exists through the electric energy metering modules in the electric energy sensors of the two adjacent stages of the three-way array structure with 1-to-2 division, so that the electric energy data series connection is realized; therefore, after the metering error of the electric energy metering modules in the electric energy sensor with the 1-to-2 three-way array structure of any level is calculated, the data after corresponding metering compensation is used as the known data for calculating the metering error of each electric energy metering module in the electric energy sensor with the 1-to-2 three-way array structure of the next level.
In combination with the embodiment of the present invention, there is an optimal extension scheme, where the electric energy measurement system includes n error self-checking three-phase electric energy meters, where each of the error self-checking three-phase electric energy meters is independent of each other in pairs, specifically:
the electric energy measuring system also comprises an error reference standard device which is connected in series with any pipeline branch of any error self-checking three-phase electric energy meter of the n error self-checking three-phase electric energy meters.
In combination with the embodiment of the present invention, there is a preferred extension scheme, where the electric energy measurement system adopts a 3-meter method for electric energy metering, and the electric energy measurement system includes at least 3 single-phase error reference standard devices, and the 3 single-phase error reference standard devices are respectively connected in series to branches of any three-way array structure 3 single-phase electric energy sensors of the electric energy measurement system, specifically:
when the error reference standard device is arranged on a branch of the last stage 1-2 tee array, transmitting an error reference value in a mode of progressively calculating from a lower level to an upper level so as to calibrate the electric energy measuring system to obtain error-free data or equal error data;
when the error reference standard device is arranged on a branch of the three-way array of the top level 1-2, transmitting an error reference value in a mode of progressively calculating from the upper level to the lower level so as to calibrate the electric energy measuring system to obtain error-free data or equal error data;
when the error reference standard device is arranged on a branch of the three-way array of the middle stage 1-2, an error reference value is transmitted in a mode of progressive calculation from the middle stage to the upper stage and in a mode of progressive calculation from the middle stage to the lower stage so as to calibrate the electric energy measuring system and obtain error-free data or equal error data.
In combination with the embodiment of the present invention, there is a preferred extension scheme, where the electric energy measurement system includes a microprocessor and a data transmission module, the microprocessor is connected to each three-phase electric energy sensor, and the data transmission module is connected to the microprocessor, and is used for error edge calculation of a three-phase electric energy meter for error self-calibration, and/or is used for sending electric energy data collected from each three-phase electric energy sensor to a cloud server.
Example 3:
a measuring method of an electric energy measuring system composed of a three-phase electric energy meter with self-error checking, wherein the measuring method comprises the following steps:
an error reference standard device is appointed or established in the electric energy measuring system, and a reference error value is given to the error reference standard device;
acquiring original measurement data of three-phase electric energy sensors on all input branches and output branches in the electric energy measurement system and original measurement data of the error reference standard device;
aiming at the 1-to-2 three-way array where the error reference standard device is located, calculating to obtain a reference measurement error value of a total meter metering module in the 1-to-2 three-way array where the error reference standard device is located, an electric energy metering module connected in series with the user electric energy meter and an electric energy metering module connected in series with an adjacent user electric energy meter by using a mathematical model established by a relative electric energy conservation relation;
acquiring a three-phase electric energy meter with the error self-checking relation of 1 in the previous stage or the next stage of the three-phase electric energy meter with the calculated error self-checking relation of the reference measurement error value, and calculating the reference measurement error values of a master meter metering module in a corresponding 1 in 2 three-way array of the previous stage or the next stage, an electric energy metering module connected in series with the user electric energy meter and an electric energy metering module connected in series with an adjacent user electric energy meter by utilizing the relative electric energy conservation relation;
and calculating the reference measurement error value process of the three-phase electric energy sensor in the three-way array of 1 minute 2 by one or more times through the previous stage or the next stage, thereby obtaining the reference measurement error values of the total meter metering module of all three-way array structures, the electric energy metering module connected in series with the user electric energy meter and the electric energy metering module connected in series with the adjacent user electric energy meter in the electric energy measuring system, compensating the original measurement data according to the reference measurement error value of each error self-checking three-phase electric energy meter, and obtaining equal error data or error-free data.
In combination with the embodiment of the present invention, there is an optimized extension, where the compensating the raw measurement data according to the reference measurement error value of each electrical energy sensing unit to obtain equal error data or error-free data includes:
compensating the corresponding original measurement data by using the reference measurement error value to obtain equal error data of the reference error value of each three-phase electric energy sensor relative to the error reference standard device; when a delta X deviation exists between a real error value and a reference error value of the error reference standard device, compensating equal error data of each corresponding three-phase electric energy sensor by utilizing the delta X deviation to obtain error-free data; alternatively, the first and second electrodes may be,
and directly calculating to obtain error-free data of the three-phase electric energy meter corresponding to each error self-check according to the real error value of the error reference standard device.
In combination with the embodiment of the present invention, there is an optimal extension scheme to obtain a Δ X deviation between a true error value and a reference error value of an error reference standard device, specifically:
taking down the three-phase electric energy sensor selected as the error reference standard device, and measuring the real error value of the taken-down three-phase electric energy sensor; and subtracting the reference error value of the selected three-phase electric energy sensor from the real error value of the taken-down three-phase electric energy sensor to obtain the delta X deviation.
In combination with the embodiment of the present invention, there is a preferred extension to determine the error reference standard device and the assigned reference error value, specifically:
a three-phase electric energy sensor unit with a known real error value is connected in series to any pipeline branch of any error self-checking three-phase electric energy meter of the electric energy measuring system;
in the running process of the electric energy measuring system, respectively reading the electric energy data of the three-phase electric energy sensor unit with the known real error value and the electric energy data of the three-phase electric energy sensor on the selected branch, and calculating the real error value of the three-phase electric energy sensor on the selected branch;
and the three-phase electric energy sensor on the selected branch is used as an error reference standard device, and the real error value of each connected three-phase electric energy sensor in the electric energy measuring system is calculated by using the calculated real error value of the three-phase electric energy sensor on the selected branch.
In connection with the embodiment of the present invention, there is a preferred embodiment that the error is referred to a reference error value of the standard device, including:
in the electric energy measuring system, after any three-phase electric energy sensor is selected as an error reference standard device, a preset reference error value is matched with a measuring error of the error reference standard device, wherein the difference value between the preset reference error value of the error reference standard device and an actual error value of the error reference standard device is equal to the delta X deviation.
In connection with the embodiment of the present invention, there is a preferred embodiment, where the measurement method further includes:
after the original measurement data of the three-phase electric energy sensor are collected, determining the similar condition of each original measurement data;
if the similarity of at least two groups of original measurement data is larger than a preset similarity threshold, the measurement error of each three-phase electric energy sensor is calculated in a cascade mode in a grading calculation mode so as to check the original measurement data;
if the similarity of each group of original measurement data is smaller than a preset similarity threshold value, the three-phase electric energy sensor sub-meter in the last stage 1-to-2 tee array and the electric energy sensor general meter in the top stage 1-to-2 tee array are used for obtaining the measurement error of the corresponding three-phase electric energy sensor by utilizing the relative electric energy conservation relation so as to verify the original measurement data.
In combination with the embodiment of the present invention, there is an optimized extension scheme that after completing the layout of the three-way array in the electric energy system and completing the calculation of the electric energy measurement errors of the three-phase electric energy sensors respectively arranged on the 1 total and 2 branch lines, the error of the electric energy measurement device in the electric energy system on the corresponding line is continuously and iteratively calculated by using the measurement data obtained by revising the errors in the three-way array.
Example 4:
at present, when the scale of an electric energy measurement system is large, due to the similarity of electric energy consumption habits of users, the problem of multiple collinearity of electric energy meter data is derived, so that not only can the calculation efficiency be reduced, but also the calculation accuracy of the data calculation method is influenced. In the embodiments and the following embodiments of the present invention, the single-phase power sensor in the three-phase power sensor is taken as an object of description to show the specific implementation processes of embodiments 1 to 3 of the present invention. As for those skilled in the art, the process of implementing the phase combination calculation according to the 3-table method or the 2-table method belongs to the well-known technical content in the field of three-phase power, and therefore, the description is omitted.
To solve the foregoing problems, the present embodiment provides an electric energy measuring system that facilitates error checking, and in practical use, the power measuring system of the pipeline with the power sensor is constructed into a structure of a plurality of subsystems which are convenient for calculating errors, the electric energy measuring system comprises at least two stages of electric energy sensors with 1-2 single-phase three-way array structures, wherein, the 1-to-2 single-phase three-way array structure electric energy sensor not only can construct an electric energy measuring system of any scale, and each single-phase electric energy measuring system in the three-phase electric energy measuring system with a large scale can be divided into a plurality of electric energy arrays with a small scale through the single-phase three-way array structure of 1-to-2, each electric energy array meets the relative energy conservation law, the error of the electric energy sensor in each electric energy array is calculated respectively, and the multiple collinearity problem of electric energy data can be effectively reduced.
Wherein the plurality of power sensors for each power array conform to a correct network topology relationship. The network topology relation refers to the connection and the affiliation relation between the incoming line side electric energy sensor and the outgoing line side electric energy sensor, wherein the concepts of the incoming line side electric energy sensor and the outgoing line side electric energy sensor are relatively speaking, and the concepts of the incoming line side electric energy sensor and the outgoing line side electric energy sensor are a relation between an electric energy general meter and an electric energy branch meter.
With reference to fig. 2, a schematic structural diagram of an electric energy measurement system composed of a three-phase electric energy meter with self-error calibration according to this embodiment is described, where the electric energy measurement system includes: the electric energy sensor with the three-way array structure comprises at least two stages of electric energy sensors with the 1-in-2-branch array structure, wherein each stage of electric energy sensor with the 1-in-2-branch array structure comprises an electric energy sensor general meter unit positioned on an incoming line side and 2 electric energy sensor sub meter units positioned on an outgoing line side, and the electric energy sensor general meter unit positioned on the incoming line side and the 2 electric energy sensor sub meter units positioned on the outgoing line side form a relative energy conservation relation.
The electric energy sensor with the 1-to-2 adjacent two stages of single-phase three-way array structures comprises an electric energy sensor sub-meter unit positioned on the outgoing line side in the electric energy sensor with the 1-to-2 previous stage single-phase three-way array structure, and an electric energy sensor main meter unit positioned on the incoming line side in the electric energy sensor with the 1-to-2 next stage single-phase three-way array structure.
In this embodiment, the upper stage and the lower stage are relative concepts, wherein the electric energy sensor excluding the electric energy sensor at the uppermost stage and the electric energy sensor at the last stage, and the electric energy sensor located in the middle are different electric energy sensors of 1 to 2 single-phase three-way array structures, and may be subordinate to the electric energy sensor of the 1 to 2 single-phase three-way array structure at the upper stage, or subordinate to the electric energy sensor of the 1 to 2 single-phase three-way array structure at the lower stage, and when a certain electric energy sensor is subordinate to the electric energy sensor of the 1 to 2 single-phase three-way array structure at the upper stage, the electric energy sensor is an electric energy sensor sub-meter; when a certain electric energy sensor belongs to the electric energy sensor of the next stage 1-to-2 single-phase three-way array structure, the electric energy sensor is an electric energy sensor general meter.
The explanation shows the error calculation and compensation of the electric energy sensor with the 1-in-2-three-way array structure.
For a 1 main pipeline and 2 branch pipelines electric energy measuring system, the electric energy conforms to the relative energy conservation relation, namely the following formula is satisfied:
wherein w is in the above formula0，x0And wi，xiAnd respectively representing the original measurement data and the error of the 1 electric energy sensor summary table corresponding to the ith electric energy sensor.
In phase A, w is illustrated in FIG. 20、w1And w2The combination of (1) can correspond to the combination of the A-phase general table metering module 1, the A-phase electric energy metering module 1.1 and the A-phase electric energy metering module 1.2; or the combination of the A phase general table metering module 2, the A phase electric energy metering module 2.1 and the A phase electric energy metering module 2.2; the method can also be used for correspondingly combining the A-phase general table metering module 3, the A-phase electric energy metering module 3.1 and the A-phase electric energy metering module 3.2, and so on. For the phases B and C, the corresponding relationship can also refer to the above description of the phase a, and is not repeated herein.
In the foregoing formula, x0And xiThe error value of other electric energy sensors can be obtained by reading data for not less than 2 times by using any known quantity.
The calculated error value is used for compensating the reading of the electric energy sensor general meter unit and the reading of the electric energy sensor sub-meter, so that electric energy data without errors or the like can be obtained:
w′0＝w0(1+x0)
w′i＝wi(1+xi)
wherein, w'0And w'iRespectively representing the electric energy data of the compensated electric energy sensor general meter unit and the electric energy sensor sub-meter, wherein the compensated data also meet the relative energy conservation relation:
in the foregoing calculation process, an error reference standard needs to be set, and error-free data or equal error data can be obtained through the error reference standard, so that error correction is performed on the electric energy measurement system.
The selection or setting of the reference standard for error includes at least the following ways: a cascade computing transfer method; a sharing standard method; a standard method of concatenation; and (4) a post correction method.
The cascade computation transfer method comprises the following steps: an electric energy sensor is selected as an error reference standard device on a branch circuit of the electric energy sensor of a single-phase three-way array structure with a certain level of 1-2, and a reference error value is given to the error reference standard device.
Specifically, when the error reference standard device is arranged on a branch of the electric energy sensor with the 1-2 last-stage single-phase three-way array structure, an error reference value is transmitted in a mode of calculation from a lower stage to an upper stage, so that the electric energy measuring system is calibrated to obtain error-free data or equal error data; when the error reference standard device is arranged on a branch of the single-phase three-way array structure electric energy sensor at the top level 1-2, an error reference value is transmitted in a mode of calculation from the upper level to the lower level, so that the electric energy measuring system is calibrated to obtain error-free data or equal error data. In a preferred embodiment, the error reference standard device may be disposed at the middle stage, so that the calibration may be performed from the middle stage to both ends, and the calculation efficiency may be improved, specifically, when the error reference standard device is disposed on the branch of the single-phase three-way array structure electric energy sensor of middle stage 1 and 2, the error reference value is transmitted by means of calculation from the middle stage to the upper stage and by means of calculation from the middle stage to the lower stage, so as to calibrate the electric energy measurement system, and obtain error-free data or equal error data.
For example, a "1" in the electric energy sensor of each lower level (with error values calculated) 1 to 2 single-phase three-way array structure can be a subset of a "2" in the electric energy sensor of another upper level (with errors calculated yet) 1 to 2 single-phase three-way array structure; similarly, one subset of "2" in the electric energy sensor of the single-phase three-way array structure of 1 to 2 at each upper level (for which the error value has been calculated) may be "1" in the "1 to 2 array unit" at another lower level (for which the error value has yet to be calculated). In this way, the error reference value is transmitted in a cascading manner, and the calibration is performed on the electric energy sensors in each independent 1-to-2 single-phase three-way array structure electric energy sensor.
When delta X deviation exists between the real error value and the reference error value of the error reference standard device, the equal error data of each corresponding electric energy sensor is compensated by the delta X deviation, and error-free data are obtained. When the reference error value of the error reference standard device is the same as the real error value of the error reference standard device, calculating to obtain error-free data corresponding to each electric energy sensor directly according to the real error value of the error reference standard device.
Wherein, the sharing standard method refers to: one known or unknown error electric energy sensor is connected in series with any branch pipeline in 1 single-phase three-way array structure electric energy sensors in 1 minute 2, and the branch pipeline is used as an error reference standard device, so that the electric energy sensor error calculation corresponding to the single-phase three-way array structure in 1 minute 2 can be completed. Then, the same known or unknown error electric energy sensor is connected in series to any branch pipeline in the adjacent 1-to-2 single-phase three-way array structure electric energy sensors through pipeline switching, and the branch pipeline is used as an error reference standard device, so that the error calculation of the adjacent 1-to-2 single-phase three-way array structure electric energy sensors can be completed. By sharing standard methods, it is possible to use the error magnitude transfer between 2 independent 1 in 2 single phase three-way array structured power sensors.
Specifically, the power measuring system comprises a first 1-in-2 single-phase three-way array structure power sensor and a second 1-in-2 single-phase three-way array structure power sensor, wherein the first 1-in-2 single-phase three-way array structure power sensor and the second 1-in-2 single-phase three-way array structure power sensor are independent of each other;
the electric energy measuring system further comprises an error reference standard device, the error reference standard device is arranged on a pipeline branch of the electric energy sensor of the first 1-in-2 single-phase three-way array structure, the error reference standard device is also arranged on a pipeline branch of the electric energy sensor of the second 1-in-2 single-phase three-way array structure, and a switch is arranged on the selected pipeline branch; wherein the line branch into which the error reference standard device is connected in series is switched by the state of a setting switch to selectively connect the error reference standard device in series to the first 1-in-2 single-phase three-way array structure electric energy sensor or the second 1-in-2 single-phase three-way array structure electric energy sensor.
For example, the corresponding circuit structure design can refer to fig. 3, and the pipeline switching is performed by controlling the on/off of the corresponding switch. As shown in fig. 3, taking the power sensor of the 1-in-2 single-phase three-way array structure as an example for explanation, the power sensor of the first 1-in-2 single-phase three-way array structure and the power sensor of the second 1-in-2 single-phase three-way array structure are independent of each other, the error is connected in series with reference to a standard device on one of the pipeline branches of the power sensor of the first 1-in-2 single-phase three-way array structure and the power sensor of the second 1-in-2 single-phase three-way array structure, meanwhile, a switch K1 is arranged on a pipeline branch of the electric energy sensor of the first 1-to-2 single-phase three-way array structure, a switch K1 is connected with the error reference standard device in parallel, the switch K1 and the error reference standard device are both connected with the electric energy sensor on the selected branch in series, a switch K2 is arranged between the error reference standard device and the electric energy sensor on the selected branch circuit; meanwhile, a switch K3 is arranged on a pipeline branch of the electric energy sensor of the single-phase three-way array structure of the second 1-to-2 part, a switch K3 is connected with the error reference standard device in parallel, the switch K3 and the error reference standard device are both connected with the electric energy sensor on the selected branch in series, and a switch K4 is arranged between the error reference standard device and the electric energy sensor on the selected branch. The switches K1-K4 are switch channels of the relay, and the on-off of the corresponding switches K1-K4 is controlled through the relay.
In practical use, when the switch K1 is set to be in an open state, the switch K2 is set to be in a closed state, the switch K3 is set to be in a closed state, and the switch K4 is set to be in an open state, the error reference standard device is connected in series to the corresponding pipeline of the first 1-to-2 single-phase three-way array structure electric energy sensor, and as an error reference standard, the electric energy sensor in the first 1-to-2 single-phase three-way array structure electric energy sensor is subjected to error checking.
In practical use, when the switch K1 is set to be in a closed state, the switch K2 is set to be in an open state, the switch K3 is set to be in an open state, and the switch K4 is set to be in a closed state, the error reference standard device is connected in series to the corresponding pipeline of the second 1-to-2 single-phase three-way array structure electric energy sensor, and as an error reference standard, the electric energy sensor in the second 1-to-2 single-phase three-way array structure electric energy sensor is subjected to error checking.
In the embodiment, the error calibration of the two independent 1/2 single-phase three-way array structure electric energy sensors can be completed through one error reference standard device, and the normal work of each other is not influenced. In the 1-to-2 single-phase three-way array structure of the power sensor, the sharing standard method is similar, and the detailed description is omitted here.
Wherein, the standard method of concatenation refers to: the electric energy sensor with known errors is connected in series with any branch pipeline in the electric energy sensor with the 1-to-2 single-phase three-way array structure and used as an error reference standard device, and the electric energy sensor error calculation of the 1-to-2 single-phase three-way array structure can be completed.
The post correction method comprises the following steps: selecting 1 branch electric energy sensor in the electric energy sensors of the 1-to-2 single-phase three-way array structure, giving a reference error value to the branch electric energy sensors, and calculating the errors of all the electric energy sensors of the 1-to-2 single-phase three-way array structure. The method comprises the steps of taking down any branch pipeline electric energy sensor from the electric energy sensor of the 1-to-2 single-phase three-way array structure, measuring a real error value by using a standard experimental method, calculating the deviation between a set reference error value and the real error value, correcting the errors of all the electric energy sensors by using the deviation, obtaining the real errors of all the electric energy sensors, and correcting original measurement data to obtain error-free data.
Further, the electric energy measuring system comprises a microprocessor and a data transmission module, the microprocessor is connected with each electric energy sensor, and the data transmission module is connected with the microprocessor and used for sending the electric energy data collected by the microprocessor from each electric energy sensor to the cloud server.
And the I/O ports with the preset number in the microprocessor are set to be connected with the data transmission ends of the electric energy sensors with the preset number. The acquisition end of the sub-meter of the electric energy sensor positioned at the last stage is coupled with a user line and/or a user pipeline which are responsible for detection and used for feeding back the actual use condition of the corresponding user to the microprocessor; the data transmission module is connected with the microprocessor, and sends detection data acquired from the electric energy sensors to the cloud server when necessary.
With reference to the above embodiments, the power measurement system provided by the present invention includes at least two stages of 1 to 2 single-phase three-way array structure power sensors, wherein the 1 to 2 single-phase three-way array structure power sensors can not only construct a power measurement system of any scale, but also divide a power measurement system of a larger scale into a plurality of power arrays of a smaller scale through the 1 to 2 single-phase three-way array structure power sensors, each power array satisfies the law of relative energy conservation, and calculates errors of the power sensors in each power array, so as to reduce multiple collinearity influences on power data calculation caused by similar habits of users on power utilization, and improve calculation efficiency and calculation accuracy.
Example 5:
with reference to the electric energy measurement system of the foregoing embodiment, this embodiment provides a method for measuring an electric energy system composed of a three-phase electric energy meter with self-calibration error, where the electric energy measurement system includes: the electric energy sensor comprises at least two stages of 1-to-2 single-phase three-way array structure electric energy sensors, wherein each stage of 1-to-2 single-phase three-way array structure electric energy sensor comprises an electric energy sensor general meter unit positioned on an incoming line side and 2 electric energy sensor sub meter units positioned on an outgoing line side, and a relative energy conservation relation is formed by the electric energy sensor general meter unit positioned on the incoming line side and the 2 electric energy sensor sub meter units positioned on the outgoing line side; the electric energy sensor of the single-phase three-way array structure of the adjacent two stages 1 to 2 is an electric energy sensor sub-meter unit positioned on the outgoing line side in the electric energy sensor of the single-phase three-way array structure of the previous stage 1 to 2, and is an electric energy sensor general meter positioned on the incoming line side in the electric energy sensor of the single-phase three-way array structure of the next stage 1 to 2;
referring to fig. 4, the method for measuring the electric energy system formed by the error self-checking three-phase electric energy meter includes the following steps:
step 10: an error reference standard device is designated or established in the electric energy measurement system and is assigned a reference error value.
In this embodiment, in order to calibrate the original data, an error reference standard device needs to be set first, and then the original measurement data is calibrated based on the error reference standard device, so as to eliminate errors and obtain more accurate electric energy data; there are at least several ways to set the error reference standard device.
In a first mode, by using a post calibration method, the determining an error reference standard device, specifically, by selecting any one of the electric energy sensors in the electric energy measurement system as the error reference standard device, obtaining a Δ X deviation between an actual error value of the error reference standard device and the reference error value, as shown in fig. 5, specifically includes:
step 1111: the selected power sensor is removed from the power measurement system and an actual error value of the selected power sensor is measured.
Referring to fig. 2, the electric energy measurement system includes a large number of electric energy sensors, wherein each of the electric energy sensors of the single-phase three-way array structure with 1 division 2 at each stage includes 3 electric energy sensors, one electric energy sensor general meter is used for measuring incoming line energy, 2 electric energy sensor sub meters are used for measuring branch line energy, and the 3 electric energy sensors form a correct network topology relationship, and whether the network topology relationship is correct or not can be determined according to a correlation method.
Aiming at each stage of 1-2 single-phase electric energy sensors with a three-way array structure, one electric energy sensor can be selected from 3 electric energy sensors to serve as an error reference standard device.
Step 1112: subtracting the reference error value of the selected power sensor from the actual error value of the selected power sensor to obtain the Δ X deviation.
In an alternative embodiment, a numerical value is automatically designated as the error designated value according to an actual situation, or a numerical value is selected from a standard measurement error interval as the designated value. The specified value may be different from the actual measurement error of the electric energy sensor, and the measurement error of the electric energy sensor cannot be truly reflected. And the difference value of the error designated value of the error reference standard device and the error value of the error reference standard device is equal to the Delta X deviation.
In a second mode, a series standard method is adopted, and the error reference standard determining device is specifically that a first electric energy sensor unit with a known actual error value is connected in series to a branch where any one electric energy sensor in the electric energy measuring system is located, so that the reference measuring error of each electric energy sensor in the electric energy measuring system is obtained through calculation, as shown in fig. 6, the specific electric energy measuring system includes:
step 1121: and respectively reading the electric energy data of the first electric energy sensor unit and the electric energy data of the electric energy sensors on the branches in the running process of the electric energy measuring system, and calculating the actual error value of the electric energy sensor on the selected branch.
Step 1122: and the electric energy sensors on the selected branch are used as error reference standard devices, and the real error of each electric energy sensor in the electric energy measuring system is calculated by using the calculated actual error value of the electric energy sensors on the selected branch.
In the implementation process of the second mode, it is also recommended to set an interface for the first power sensor unit to intervene in a certain branch or multiple branches of the existing power measurement system.
In a third mode, by adopting a cascade computing and transferring method, if the electric energy measurement system and the adjacent first electric energy measurement system and/or second electric energy measurement system can construct a relatively second electric energy conservation environment, the error reference standard device is determined, specifically, an electric energy sensor with a known actual error value is arbitrarily selected from the first electric energy measurement system and/or the second electric energy measurement system as the error reference standard device; then, the calculating to obtain the reference measurement error of each electric energy sensor in the electric energy measurement system, as shown in fig. 7, specifically includes:
step 1131: and establishing an energy equation according to the second electric energy conservation environment by using the electric energy measuring system and each electric energy sensor in the adjacent first electric energy measuring system and/or second electric energy measuring system.
Step 1132: and calculating to obtain the real error of each electric energy sensor in the electric energy measuring system according to the actual error value of the error reference standard device.
In this embodiment, according to the adjacent electric energy measurement system with the known actual error value, the electric energy sensor with the actual error value in the adjacent electric energy measurement system may be selected as an error reference standard device, and the reference error value determined according to this method is an actual error value (also described as a real error), so that the actual error value of each electric energy sensor in the electric energy measurement system to be measured can be calculated and obtained under the condition that a relatively second electric energy conservation environment can be established based on the electric energy measurement system to be measured and the adjacent first electric energy measurement system and/or second electric energy measurement system.
In the third mode, when the error reference standard device is set, the measurement error of each electric energy sensor obtained in the following step 12 is the actual error value of each electric energy sensor, and after the corresponding original data is calibrated through the actual error value, the error-free electric energy data can be obtained. In general, the third of the three ways is the most intelligent, but the specific implementation of the third way also puts higher demands on the architectural relationship, data sharing and computing capability of each electric energy measurement system in the current environment.
And fourthly, a standard sharing mode is adopted, one known or unknown error electric energy sensor is connected in series into any branch pipeline of 1 to 2 single-phase electric energy sensors with the three-way array structure and is used as an error reference standard device, and the error calculation of the electric energy sensors corresponding to the 1 to 2 single-phase three-way array structure can be completed. Then, the same known or unknown error electric energy sensor is connected in series to any branch pipeline in the adjacent 1-to-2 single-phase three-way array structure electric energy sensors through pipeline switching, and the branch pipeline is used as an error reference standard device, so that the error calculation of the adjacent 1-to-2 single-phase three-way array structure electric energy sensors can be completed. By sharing standard methods, it is possible to use the error magnitude transfer between 2 independent 1 in 2 single phase three-way array structured power sensors.
Specifically, the power measurement system comprises a first 1-in-2 single-phase three-way array structure power sensor and a second 1-in-2 single-phase three-way array structure power sensor, wherein the first 1-in-2 single-phase three-way array structure power sensor and the second 1-in-2 single-phase three-way array structure power sensor are independent of each other, namely, the first 1-in-2 single-phase three-way array structure power sensor is subordinate to one power measurement system, and the second 1-in-2 single-phase three-way array structure power sensor is subordinate to the other power measurement system; the electric energy measuring system further comprises an error reference standard device, the error reference standard device is arranged on a pipeline branch of the electric energy sensor of the first 1-in-2 single-phase three-way array structure, the error reference standard device is also arranged on a pipeline branch of the electric energy sensor of the second 1-in-2 single-phase three-way array structure, and a switch is arranged on the selected pipeline branch; wherein the line branch into which the error reference standard device is connected in series is switched by the state of a setting switch to selectively connect the error reference standard device in series to the first 1-in-2 single-phase three-way array structure electric energy sensor or the second 1-in-2 single-phase three-way array structure electric energy sensor.
In the embodiment, the error calibration of the two independent 1/2 single-phase three-way array structure electric energy sensors can be completed through one error reference standard device, and the normal work of each other is not influenced.
In other ways, a standard meter may also be incorporated into the power measurement system as an error reference standard. The setting manner of the error reference standard device is selected according to actual conditions, and is not particularly limited herein.
Step 11: and acquiring the original measurement data of the electric energy sensors on all the input branches and the output branches in the electric energy measurement system and the original measurement data of the error reference standard device.
In this embodiment, the raw measurement data of the individual power sensors may be automatically collected by the concentrator and transmitted to the database server. Wherein, because the electric energy sensor has the error, correspondingly, the raw measurement data has the error.
Step 12: and calculating the reference measurement error value of the electric energy sensor in the electric energy sensor of the 1-to-2 single-phase three-way array structure in which the error reference standard device is positioned by utilizing the relative energy conservation relation.
In this embodiment, a cascade progressive calculation mode may be adopted to transfer the reference error value, so that the scale of data calculation may be reduced, the calculation efficiency may be improved, and the problem of co-linearity caused by the similarity of the user power data may be reduced.
Step 13: and acquiring an electric energy array which is in a 1-in-2 relation with the electric energy sensor which is calculated to obtain a reference measurement error value, and calculating to obtain the reference measurement error value of the electric energy sensor in the electric energy sensor of the single-phase three-way array structure corresponding to the previous or next 1-in-2 by utilizing the relative energy conservation relation.
Step 14: and calculating the reference measurement error value process of the electric energy sensors in the electric energy sensors of the 1-to-2 single-phase three-way array structure through one or more times of the previous stage or the next stage, thereby obtaining the reference measurement error values of all the electric energy sensors in the electric energy measurement system, and compensating the original measurement data according to the reference measurement error value of each electric energy sensor to obtain equal error data or error-free data.
In this embodiment, the reference measurement error value is used to compensate the corresponding original measurement data, so as to obtain the equal error data of the reference error value of each electric energy sensor relative to the error reference standard device; when delta X deviation exists between a real error value and a reference error value of the error reference standard device, compensating equal error data of each corresponding electric energy sensor by utilizing the delta X deviation to obtain error-free data; alternatively, the first and second electrodes may be,
and directly calculating to obtain error-free data corresponding to each electric energy sensor according to the real error value of the error reference standard device.
When the error reference standard devices are arranged in different modes, the data calibration mode corresponding to the step 12 also has a difference.
When the second mode is adopted to set an error reference standard device or directly quote a standard meter as the error reference standard device, the measurement error of each electric energy sensor in the electric energy measurement system is obtained based on the error reference standard device, the measurement error is the actual error value of each electric energy sensor, and then the corresponding original measurement data is calibrated based on the actual error value of each electric energy sensor to obtain error-free data.
When the error reference standard device is selected in the above manner, the measurement error of each electric energy sensor in the electric energy measurement system is obtained based on the error reference standard device, and the measurement error is a reference measurement error of each electric energy sensor and may not be equal to an actual error value. And calibrating the original measurement data according to the reference measurement error to obtain compensated electric energy data, wherein the compensated electric energy data corresponding to each electric energy sensor is equal-error data aiming at the electric energy measurement system, and error-free data can be obtained after the equal-error data needs to be eliminated.
Due to the equal error theory, the actual error value of each electric energy sensor minus the reference measurement error thereof is correspondingly equal to the DeltaX deviation. Therefore, one electric energy sensor can be selected at will to obtain the actual error value of the electric energy sensor so as to obtain the delta X deviation of the electric energy measuring system, and the compensated electric energy data of other electric energy sensors are calibrated to obtain error-free electric energy data.
In this embodiment, after the Δ X deviation is obtained, the compensated power data of each power sensor is calibrated according to the Δ X deviation to obtain error-free power data of each power sensor, where the error-free power data is data with no error theoretically or data with negligible error.
Example 6:
fig. 8 is a schematic structural diagram of an error calibration apparatus according to an embodiment of the present invention. The error calibration apparatus of the present embodiment includes one or more processors 41 and a memory 42. In fig. 8, one processor 41 is taken as an example.
The processor 41 and the memory 42 may be connected by a bus or other means, and fig. 8 illustrates the connection by a bus as an example.
The memory 42 serves as a storage medium for storing a nonvolatile computer readable, and can be used to store a nonvolatile software program and a nonvolatile computer executable program, such as the measurement methods in embodiments 3 to 5. Processor 41 executes the measurement method by executing non-volatile software programs and instructions stored in memory 42.
The memory 42 includes high speed random access memory and/or non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, memory 42 may optionally include memory located remotely from processor 41, which may be connected to processor 41 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
It should be noted that, for the information interaction, execution process and other contents between the modules and units in the apparatus and system, the specific contents may refer to the description in the embodiment of the method of the present invention because the same concept is used as the embodiment of the processing method of the present invention, and are not described herein again.
Those of ordinary skill in the art will appreciate that all or part of the steps of the various methods of the embodiments may be implemented by associated hardware as instructed by a program, which may be stored on a computer-readable storage medium, which may include: a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and the like.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (16)
1. An error self-checking three-phase electric energy meter is characterized in that the error self-checking three-phase electric energy meter comprises three groups of 1-to-2 three-phase electric energy shunting structures, each electric energy shunting structure forms a three-phase electric energy system according with an electric energy conservation relation, wherein in each group of 1-to-2 three-phase electric energy shunting structures, 1 total pipeline and 2 branch pipelines are respectively provided with an electric energy sensing unit, each electric energy sensing unit comprises a master meter metering module, an electric energy metering module connected with a user electric energy meter in series and an electric energy metering module connected with an adjacent user electric energy meter in series, an error reference standard device is respectively connected with any pipeline of each group of 1-to-2 three-phase electric energy shunting structures in series, a mathematical model is established according to the electric energy conservation relation, and the calculation of the measuring error of the electric energy sensing unit is completed by using the electric energy data collected by the electric energy sensing unit and the error reference standard device, the three-phase electric energy shunting structure is under a 3-meter method electric energy metering method and comprises 3 sets of 1-2 single-phase three-way array structure electric energy sensors which are relatively independent and formed by independent A-phase, B-phase and C-phase single-phase electric energy sensing units; wherein, the electric energy sensing unit concrete expression is each single-phase electric energy sensing unit, and is specific:
establishing a mathematical model by utilizing the electric energy conservation relation of an electric energy system, calculating electric energy measurement errors of electric energy sensing units respectively arranged on 1-to-2 pipelines of the single-phase three-way array structure electric energy sensor according to electric energy data detected by the electric energy shunting structure and the error reference standard device, compensating the newly measured electric energy data by utilizing the calculated errors, continuously and iteratively calculating the measurement errors of the electric energy sensing units, and obtaining error-free or equal error data of the single-phase three-way array structure electric energy sensor;
the error self-checking three-phase electric energy meter is used for constructing an electric energy system with measurable electric energy errors, and the array layout of the electric energy system with measurable electric energy errors is completed in a mode of cascading the error self-checking three-phase electric energy meter.
2. The error self-checking three-phase electric energy meter according to claim 1, wherein a connection terminal for line access of the adjacent user electric energy meter is installed or reserved on a meter body or a meter shell of the error self-checking three-phase electric energy meter, so as to facilitate line access of the adjacent user electric energy meter.
3. The error self-checking three-phase electric energy meter according to claim 2, wherein the connection terminal of the error self-checking three-phase electric energy meter is connected with 1 user metering module of the user electric energy meter inside the body of the user electric energy meter, the connection terminal and the electric energy metering module on the line of the adjacent user electric energy meter connected with the connection terminal are in series connection, the electric energy on the same line is measured, and the electric energy data and the error of the electric energy data of the adjacent user metering module in the body of the user electric energy meter and the electric energy metering module on the adjacent user electric energy meter on the same line are read, calculated and analyzed, so that the magnitude transmission of the electric energy data is realized.
4. The utility model provides a three-phase electric energy meter of error self-checking which characterized in that, the three-phase electric energy meter of error self-checking specifically is:
the single-phase error self-checking device is formed by respectively additionally arranging 1 single-phase error self-checking module with a three-way array structure on three phases of 1 traditional three-phase electric energy meter; the single-phase error self-checking module of each three-way array structure forms a single-phase electric energy system which accords with the electric energy conservation relation; wherein, single-phase electric energy sensing units are respectively arranged on 1 total single-phase pipeline and 2 branch single-phase pipelines, a mathematical model is established according to the conservation relation of electric energy by connecting a single-phase error reference standard device on any pipeline of each group of 1-to-2 three-phase electric energy shunt structure in series, the calculation of the measurement error of the single-phase electric energy sensing unit is completed by utilizing the electric energy data collected by the single-phase electric energy sensing unit and the single-phase error reference standard device, after the measurement error of the A, B, C three-phase single-phase electric energy sensing unit is respectively calculated, obtaining a phase-combining electric energy measurement error of the error self-checking three-phase electric energy meter through phase-combining calculation, compensating newly measured three-phase electric energy data by using the calculated phase-combining error, continuously and iteratively calculating and compensating the measurement error of the electric energy sensing unit, and obtaining error-free or equal error data of the error self-checking three-phase electric energy meter; alternatively, the first and second electrodes may be,
the three-phase electric energy meter with the self-checking error is a three-phase electric energy meter with a 3-meter method and is composed of 3 single-phase electric energy sensors with a three-way array structure; the electric energy sensors of each single-phase three-way array structure form a single-phase electric energy system which accords with the electric energy conservation relation; the method comprises the steps that 1 total single-phase pipeline and 2 branch single-phase pipelines are respectively provided with a single-phase electric energy sensing unit, any one single-phase electric energy sensing unit is selected as a single-phase error reference standard device, a mathematical model is established according to the conservation relation of electric energy, electric energy data collected by the single-phase electric energy sensing unit and the single-phase error reference standard device are used for respectively calculating A, B, C measurement errors of the three-phase single-phase electric energy sensing units, the phase-combining electric energy measurement error of the three-phase electric energy meter with the self-checking error is obtained through phase-combining calculation, the newly measured three-phase electric energy data are compensated through the calculated phase-combining error, the measurement errors of the electric energy sensing units are continuously calculated and compensated in an iterative mode, and error-free or equal error data of the three-phase electric energy meter with the self-checking error are obtained.
5. An electric energy measuring system comprising the error self-checking three-phase electric energy meter according to any one of claims 1 to 4, wherein the electric energy measuring system comprises at least two stages of error self-checking three-phase electric energy meters, wherein each stage of error self-checking three-phase electric energy meter comprises a main meter metering module located in a main pipeline and two electric energy metering modules located in series with the user electric energy meter of a branch pipeline and an electric energy metering module located in series with an adjacent user electric energy meter, and specifically:
in a single-phase three-way array structure electric energy sensor, the electric energy of a general meter metering module, an electric energy metering module connected in series with the user electric energy meter and the electric energy of an electric energy metering module connected in series with an adjacent user electric energy meter form a relative electric energy conservation relation;
aiming at the three-phase electric energy meter with the self-checking errors of two adjacent stages 1 to 2 in the same phase of electric energy, the electric energy sensing sub-meter unit positioned in a branch line in the three-phase electric energy meter with the self-checking errors of the 1 to 2 previous stage is an electric energy metering module for the electric energy meter of the user with the self-checking errors of the 1 to 2 next stage in the branch line in series connection, so that each adjacent user in the existing system to be measured completes electric energy data series connection through the electric energy sensor with the multi-stage three-way array structure.
6. The electric energy measurement system composed of the error self-calibration three-phase electric energy meter according to claim 5, wherein the electric energy data concatenation of each adjacent user in the existing system to be measured is completed through the electric energy sensor with the multi-stage three-way array structure, specifically:
the electric energy metering modules connected in series with the adjacent user electric energy meters of the branch pipelines in the electric energy sensor with the 1-in-2 three-way array structure at the upper stage are the same as the user lines detected by the electric energy metering modules connected in series with the user electric energy meters of the branch pipelines in the electric energy sensor with the 1-in-2 three-way array structure at the lower stage;
the electric energy metering modules connected in series with the adjacent user electric energy meters of the branch pipelines in the electric energy sensor with the next-stage 1-in-2 three-way array structure are the same as the user lines detected by the electric energy metering modules connected in series with the user electric energy meters of the branch pipelines in the electric energy sensor with the next-stage 1-in-2 three-way array structure;
by analogy, the setting of detecting the same user line is carried out through the electric energy metering modules in the electric energy sensors of the two adjacent stages of 1-to-2 three-way array structures, so that the electric energy data are connected in series, and after the metering error of the electric energy metering modules in the electric energy sensors of any one stage of 1-to-2 three-way array structure is calculated, the data after corresponding metering compensation is used as the known data for calculating the metering error of each electric energy metering module in the electric energy sensors of the adjacent next stage of 1-to-2 three-way array structure.
7. The electric energy measurement system composed of the error self-calibration three-phase electric energy meter according to claim 5, wherein the electric energy measurement system comprises n error self-calibration three-phase electric energy meters, wherein each error self-calibration three-phase electric energy meter is independent of each other in pairs, specifically:
the electric energy measuring system also comprises an error reference standard device which is connected in series with any pipeline branch of any error self-checking three-phase electric energy meter of the n error self-checking three-phase electric energy meters.
8. The error self-verifying three-phase electric energy meter electric energy measuring system of claim 5, wherein the electric energy measuring system adopts a 3-meter method electric energy metering method and comprises at least 3 single-phase error reference standard devices; 3 single-phase error reference standard devices are respectively connected in series on a branch path of any three-way array structure 3 single-phase electric energy sensors of the electric energy measuring system, specifically:
when the error reference standard device is arranged on a branch of the last stage 1-2 tee array, transmitting an error reference value in a mode of progressively calculating from a lower level to an upper level so as to calibrate the electric energy measuring system to obtain error-free data or equal error data;
when the error reference standard device is arranged on a branch of the three-way array of the top level 1-2, transmitting an error reference value in a mode of progressively calculating from the upper level to the lower level so as to calibrate the electric energy measuring system to obtain error-free data or equal error data;
when the error reference standard device is arranged on a branch of the three-way array of the middle stage 1-2, an error reference value is transmitted in a mode of progressive calculation from the middle stage to the upper stage and in a mode of progressive calculation from the middle stage to the lower stage so as to calibrate the electric energy measuring system and obtain error-free data or equal error data.
9. The electric energy measurement system formed by the error self-checking three-phase electric energy meter according to claim 5, wherein the electric energy measurement system comprises a microprocessor and a data transmission module, the microprocessor is connected with each three-phase electric energy sensor, the data transmission module is connected with the microprocessor and is used for error edge calculation of the error self-checking three-phase electric energy meter and/or is used for sending electric energy data collected from each three-phase electric energy sensor to a cloud server.
10. A measuring method of an electric energy measuring system composed of a three-phase electric energy meter with self-error checking is characterized by comprising the following steps:
an error reference standard device is appointed or established in the electric energy measuring system, and a reference error value is given to the error reference standard device;
acquiring original measurement data of three-phase error self-checking electric energy meters of all three-way array structures in the electric energy measurement system and electric energy sensors on all branches in the electric energy meters, and original measurement data of the error reference standard device;
aiming at the 1-to-2 three-way array where the error reference standard device is located, calculating to obtain a reference measurement error value of a total meter metering module in the 1-to-2 three-way array where the error reference standard device is located, an electric energy metering module connected in series with the user electric energy meter and an electric energy metering module connected in series with an adjacent user electric energy meter by using a mathematical model established by a relative electric energy conservation relation;
acquiring a three-phase electric energy meter with the error self-checking relation of 1 in the previous stage or the next stage of the three-phase electric energy meter with the calculated error self-checking relation of the reference measurement error value, and calculating the reference measurement error values of a master meter metering module in a corresponding 1 in 2 three-way array of the previous stage or the next stage, an electric energy metering module connected in series with the user electric energy meter and an electric energy metering module connected in series with an adjacent user electric energy meter by utilizing the relative electric energy conservation relation;
and calculating the reference measurement error value process of the three-phase electric energy sensor in the three-way array of 1 minute 2 by one or more times through the previous stage or the next stage, thereby obtaining the reference measurement error values of the total meter metering module of all three-way array structures, the electric energy metering module connected in series with the user electric energy meter and the electric energy metering module connected in series with the adjacent user electric energy meter in the electric energy measuring system, compensating the original measurement data according to the reference measurement error value of each error self-checking three-phase electric energy meter, and obtaining equal error data or error-free data.
11. The method for measuring an electric energy measuring system of a three-phase electric energy meter with self-error check according to claim 10, wherein the compensating the original measured data according to the reference measured error value of each electric energy sensing unit to obtain equal error data or error-free data comprises:
compensating the corresponding original measurement data by using the reference measurement error value to obtain equal error data of the reference error value of each three-phase electric energy sensor relative to the error reference standard device; when a delta X deviation exists between a real error value and a reference error value of the error reference standard device, compensating equal error data of each corresponding three-phase electric energy sensor by utilizing the delta X deviation to obtain error-free data; alternatively, the first and second electrodes may be,
and directly calculating to obtain error-free data of the three-phase electric energy meter corresponding to each error self-check according to the real error value of the error reference standard device.
12. The method of claim 11, wherein obtaining Δ X deviation between a true error value and a reference error value of the error reference standard device comprises:
taking down the three-phase electric energy sensor selected as the error reference standard device, and measuring the real error value of the taken-down three-phase electric energy sensor; and subtracting the reference error value of the selected three-phase electric energy sensor from the real error value of the taken-down three-phase electric energy sensor to obtain the delta X deviation.
13. The method of claim 11, wherein the determination of the error reference standard and the assigned reference error value is performed by:
a three-phase electric energy sensor unit with a known real error value is connected in series to any pipeline branch of any error self-checking three-phase electric energy meter of the electric energy measuring system;
in the running process of the electric energy measuring system, respectively reading the electric energy data of the three-phase electric energy sensor unit with the known real error value and the electric energy data of the three-phase electric energy sensor on the selected branch, and calculating the real error value of the three-phase electric energy sensor on the selected branch;
and the three-phase electric energy sensor on the selected branch is used as an error reference standard device, and the real error value of each connected three-phase electric energy sensor in the electric energy measuring system is calculated by using the calculated real error value of the three-phase electric energy sensor on the selected branch.
14. The method of claim 11, wherein the error is referenced to a reference error value of a standard device, comprising:
in the electric energy measuring system, after any three-phase electric energy sensor is selected as an error reference standard device, a preset reference error value is matched with a measuring error of the error reference standard device, wherein the difference value between the preset reference error value of the error reference standard device and an actual error value of the error reference standard device is equal to the delta X deviation.
15. The method of measuring in a power measurement system of an error self-verified three-phase power meter of claim 11, further comprising:
after the original measurement data of the three-phase electric energy sensor are collected, determining the similar condition of each original measurement data;
if the similarity of at least two groups of original measurement data is larger than a preset similarity threshold, the measurement error of each three-phase electric energy sensor is calculated in a cascade mode in a grading calculation mode so as to check the original measurement data;
if the similarity of each group of original measurement data is smaller than a preset similarity threshold value, the three-phase electric energy sensor sub-meter in the last stage 1-to-2 tee array and the electric energy sensor general meter in the top stage 1-to-2 tee array are used for obtaining the measurement error of the corresponding three-phase electric energy sensor by utilizing the relative electric energy conservation relation so as to verify the original measurement data.
16. The method of claim 11, wherein after the layout of the tee array in the electric power system and the calculation of the electric power measurement errors of the three-phase electric power sensors respectively disposed on the 1 total and 2 branch lines are completed, the error of the electric power measurement device in the electric power system on the corresponding line is continuously and iteratively calculated by using the measurement data after the error correction in the tee array.
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| CN114152813B (en) * | 2020-09-08 | 2024-03-15 | 武汉国测数据技术有限公司 | Error self-checking three-phase electric energy meter and measuring system and method thereof |
| CN117406162A (en) * | 2023-12-14 | 2024-01-16 | 北京京仪北方仪器仪表有限公司 | Error checking method and system for net-shaped electric energy sensor |
| CN117406162B (en) * | 2023-12-14 | 2024-02-27 | 北京京仪北方仪器仪表有限公司 | Error checking method and system for net-shaped electric energy sensor |
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