Intelligent electric energy meter with error self-detection

Abstract

The present application relates to the technical field of intelligent meter measurement, and particularly relates to a smart electric energy meter with error self-detection, comprising a signal sending module, a signal receiving module, an error analysis module, a current sensing module, a voltage sensing module, an analog-digital conversion module and an adjusting module. The signal sending module alternately sends a voltage test group in the range of rated voltage ±10% and a current test group based on a 2 / 3 neighborhood of maximum current, so as to realize full-range coverage detection. The signal receiving module adopts difference approximation analysis to exclude endpoint accidental interference, and combines double-layer variance and difference analysis algorithm to accurately identify mechanical error, system error and composite system error type. The adjusting module is configured with multiple dynamic compensation strategies, and adopts composite operation to realize accurate correction for the error combination scene of voltage and current. The problems of incomplete error detection coverage, weak anti-interference and single compensation of the traditional electric energy meter are solved, and the measurement accuracy and system stability are significantly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent meter measurement, and particularly relates to an intelligent electric energy meter with error self-detection. BACKGROUND

[0002] The electric energy meter is composed of a measurement unit, a data processing unit, a communication unit, etc., and has functions of electric energy metering, data processing, real-time monitoring, automatic control, information interaction, etc. The intelligent electric energy meter can be divided into single-phase meters and three-phase meters according to user types. According to different payment methods, the meter can be divided into local meters and remote meters. The single-phase meter is used to measure 220V electricity for ordinary users. The three-phase meter is used to measure 380V electricity for industrial users. The local meter is used to measure electricity for users who can use IC cards to pay electricity bills. The remote meter is generally not installed in the user range, and users need to go to the power supply bureau to pay electricity bills.

[0003] Chinese Patent Publication No. CN111413660A discloses a test method and system for the error self-detection function of an electric energy meter. The test method and system include a regulation module that sets a control signal and sends the control signal to a waveform generation module and a signal amplification module. The waveform generation module generates a basic electric wave signal in response to the control signal and sends the basic electric wave signal to a signal superposition module. The signal amplification module extracts an electric energy meter self-detection signal, amplifies or reduces the amplitude of the electric energy meter self-detection signal in response to the control signal, generates an adjustment signal, and sends the adjustment signal to the signal superposition module. The signal superposition module receives the basic electric wave signal and the adjustment signal, superimposes the basic electric wave signal and the adjustment signal to generate a sampling signal, and inputs the sampling signal to the electric energy meter for error self-detection function testing. After obtaining the theoretical result value and the self-detection result value, the difference between the two values is compared with the preset difference value range.

[0004] Therefore, the test method and system for the error self-detection function of the electric energy meter have the following problems:

[0005] There is a lack of analysis and judgment of the theoretical value and the self-detection result value, which may lead to inaccurate information obtained;

[0006] There is a lack of analysis of the fault cause, which may lead to inaccurate adjustment of the fault cause. SUMMARY

[0007] Therefore, the present application provides an intelligent electric energy meter with error self-detection to overcome the problem of inaccurate adjustment in the prior art.

[0008] To achieve the above purpose, the present application provides an intelligent electric energy meter with error self-detection, which comprises,

[0009] a signal sending module, which is capable of generating a set of analog electric signal information, and each set of analog electric signal information contains several analog electric signal information;

[0010] a signal receiving module, which receives the set of analog electric signal information,

[0011] a signal reading unit, which is connected to the signal receiving module and is capable of reading the numerical values of the several analog electric signal information in the set of analog electric signal information and outputting several received information values;

[0012] a deviation determining unit, which determines whether the analog electric signal information has reading deviation by comparing the analog values of the analog electric signal information with the corresponding received information values, and determines whether the set of analog electric signal information has error by the existence of analog electric signal information deviation.

[0013] an error analysis module, which analyzes the causes of reading error by analyzing the difference or ratio between the analog values of the analog electric signal information and the corresponding received information values, determines the type of reading error and the corresponding type of deviation difference or deviation ratio;

[0014] a current sensing module, which includes a shunt and a transformer, and is capable of detecting the current on the line during operation and generating a current signal;

[0015] a voltage sensing module, which includes a voltage dividing resistor and a transformer, and is capable of detecting the voltage on the line during operation and generating a voltage signal;

[0016] an analog-to-digital conversion module, which is connected to the current sensor and the voltage sensor respectively, and is capable of converting the current signal and the voltage signal obtained by the sensors into digital information;

[0017] a regulating module, which is connected to the analog-to-digital conversion module and the error analysis module respectively, and is capable of correcting the digital information converted by the analog-to-digital conversion module according to the analysis results of the error analysis module to calculate the power consumption of the electric energy meter.

[0018] Further, the set of analog electric signal information includes a set of analog current signal information and a set of analog voltage signal information, wherein,

[0019] the set of analog current signal information includes several current signal information with increasing numerical values;

[0020] the set of analog voltage signal information includes several voltage signal information with increasing numerical values.

[0021] Further, the deviation determination unit subtracts the analog value of any analog electric signal information from the corresponding received information value, and calculates the difference value ratio, and determines whether the received information value output by the signal reading unit is deviated through the difference value ratio;

[0022] Further, the deviation determination unit subtracts the analog value of any analog electric signal information from the corresponding received information value, and integrates the difference values of the same group of analog electric signal information groups, and determines whether the reading deviation belongs to a type of deviation according to the analysis of the integrated data.

[0023] The type of deviation is that the reading deviation occurs at the minimum analog electric signal information of the same group of analog electric signal information groups, and the variance of the difference values of the same group of analog electric signal information groups is less than the evaluation value.

[0024] Further, the deviation determination unit analyzes the electric signal information in the analog electric signal information group, and if the type of deviation exists, or two or more reading deviations exist, it is determined that the analog electric signal information group has an error, and if the type of deviation does not exist, and one or less reading deviations exist, it is determined that the analog electric signal information group does not have an error.

[0025] Further, the error analysis module obtains the slope of the analog value difference of each segment of analog electric signal information by calculating the quotient of the difference value of each segment of analog electric signal information analog value and the difference value of each segment of received value, calculates the average value of each segment of slope and the variance of slope, and determines the stability of the data through the variance of the slope, and determines the cause of the error through the average value of the slope.

[0026] The error analysis module further analyzes the cause of the error by introducing a composite judgment value.

[0027] Further, the error analysis module determines the stability of the analog electric signal information group through the variance of the slope, and if the slope variance is greater than the threshold value, it is determined that the numerical fluctuation of the analog electric signal group is large and does not have judgment value, and if the slope variance is less than or equal to the threshold value, it is determined that the numerical fluctuation of the analog electric signal group is small and has judgment value.

[0028] The error analysis module divides the cause of the error of the analog electric signal group with the slope variance less than or equal to the threshold value into mechanical error and system error through the average value of the slope,

[0029] The mechanical error is the cause of the error of the analog electric signal information analog value and the received information value when the average value of the slope is greater than or equal to 0.95 and less than 1.1.

[0030] System error is the error between the average value of the slope and 0.95 or 1.1, which is caused by the error between the analog signal information and the received information;

[0031] Composite system error is a special case of system error. When the electric energy meter has system error, a composite judgment value is introduced to determine the initial error value to determine whether mechanical error exists simultaneously. If the initial error value is greater than the difference between the minimum analog signal information and the maximum deviation allowed to exist, the electric energy meter has mechanical error and system error simultaneously, and the composite system error exists. If the initial error value is less than or equal to the minimum analog signal information, the electric energy meter only has the system error.

[0032] Further, when the electric energy meter only has mechanical error, the error analysis module calculates the average difference between the analog signal information and the received information to analyze the error difference of the mechanical error;

[0033] When the electric energy meter has system error, the error analysis module determines the error ratio of the system error by the average slope of the analog signal information group;

[0034] When the electric energy meter has composite system error, the error analysis module further determines the error difference of the mechanical error and the error ratio of the system error by the above two ways;

[0035] Further, the adjustment module determines the adjustment method of the electric energy meter display data according to the type of the analog signal information that causes the error;

[0036] The adjustment module determines the adjustment method of the electric energy meter detection data according to the cause of the current error when only the analog current information group has error;

[0037] The adjustment module determines the adjustment method of the electric energy meter detection data according to the cause of the voltage error when only the analog voltage information group has error;

[0038] The adjustment module determines the adjustment method of the electric energy meter detection data according to the cause of the current error and the cause of the voltage error when both the analog current information group and the analog voltage information group have error;

[0039] Further, the adjustment module adjusts the display data of the electric energy meter according to the type of the error when the analog current signal information group has error;

[0040] When only mechanical error exists, the adjusting module corrects the error by subtracting the mechanical error value from the current value output by the analog-to-digital conversion module;

[0041] When only system error exists, the adjusting module corrects the error by multiplying the current value output by the analog-to-digital conversion module by the error ratio;

[0042] When composite system error exists, the adjusting module corrects the error by subtracting the mechanical error value from the current value output by the analog-to-digital conversion module and multiplying the current value output by the analog-to-digital conversion module by the error ratio;

[0043] When the adjusting module generates error in the analog voltage information group, the adjusting module adjusts the detection result displayed by the electric energy meter according to the cause of the error generation;

[0044] When only mechanical error exists, the adjusting module corrects the error by subtracting the mechanical error value from the voltage value output by the analog-to-digital conversion module;

[0045] When only system error exists, the adjusting module corrects the error by multiplying the voltage value output by the analog-to-digital conversion module by the error ratio;

[0046] When composite system error exists, the adjusting module corrects the error by subtracting the mechanical error value from the voltage value output by the analog-to-digital conversion module and multiplying the voltage value output by the analog-to-digital conversion module by the error ratio.

[0047] Compared with the prior art, the beneficial effects of the present application are that the signal transmitting module sets up voltage and current alternating detection mechanism, adopts voltage test range of rated voltage ±10% (200V-240V) and current test range of maximum current 2 / 3 neighborhood (5.6A-7.6A), effectively solves the problem that traditional single-point detection cannot cover the full working interval of the electric energy meter, expands the voltage detection coverage range to ±10%, improves the current detection accuracy, and significantly improves the comprehensiveness of electric energy meter error identification.

[0048] Further,

[0049] The signal receiving module adopts signal group endpoint sporadic event exclusion mechanism, effectively distinguishes device failure from transient interference through difference approximation analysis, improves the anti-interference ability of the system, reduces the false triggering rate, and maintains the accuracy of data and the stability of the system.

[0050] Further,

[0051] The error analysis module innovatively adopts a double-layer error discrimination algorithm combining variance analysis and difference comparison. By comparing the difference variance value of the signal group with the pre-deviation evaluation value, the mechanical error, system error and composite system error are accurately classified, the error type identification accuracy is significantly improved compared with the traditional method, and the misjudgment rate is reduced.

[0052] Further,

[0053] The use of variance and mean in error analysis is to distinguish random error and systematic error. Mechanical error is usually a fixed offset, while system error may show a proportional relationship. By calculating the variance, it can be determined whether the error is consistent, so as to determine the type. The correction strategy is adjusted according to different error type combinations to ensure that all possible error conditions are covered and the correction accuracy is improved.

[0054] Further,

[0055] The adjustment module provides differentiated correction strategies for various combination scenarios of mechanical error, system error and composite system error of the current and voltage of the electric energy meter, covering all types of error scenarios of single error and composite system error. Through accurate identification of error sources and dynamic matching of correction parameters, fine differentiation and targeted compensation of error types are realized, significantly improving the applicability and coverage of the correction strategy. Through accurate error compensation, the dependence on high-cost sensors can be reduced, and the economic loss caused by metering error can be reduced, and the social and economic benefits are doubled. The adjustment module realizes the order of magnitude improvement of the metering accuracy of the electric energy meter through fine identification of error types and dynamic matching of compensation strategies, and has strong engineering applicability and low maintenance cost, providing an innovative solution for high-precision metering of smart grids. BRIEF DESCRIPTION OF DRAWINGS

[0056] Figure 1 The structure diagram of the intelligent electric energy meter with error self-detection according to the present application;

[0057] Figure 2 The working flowchart of the intelligent electric energy meter with error self-detection according to the present application;

[0058] Figure 3 The flowchart of the signal receiving module judging whether the analog electric signal information exists deviation according to the present application;

[0059] Figure 4 The flowchart of the signal receiving module judging whether the electric energy meter exists error according to the present application; DETAILED DESCRIPTION

[0060] In order to make the objects, technical schemes and advantages of the present application clearer, the following further describes the present application with reference to the embodiments; it should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0061] The preferred embodiments of the present application are described below with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application and not to limit the protection scope of the present application.

[0062] It should be noted that, in the description of the present application, the terms of direction or position relationship such as "upper", "lower", "left", "right", "inner", "outer" and the like are based on the direction or position relationship shown in the drawings, which is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0063] In addition, it should also be noted that, in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0064] Please refer to Figures 1-4 shown, Figure 1 a structural schematic diagram of the intelligent electric energy meter with error self-detection according to the present application, Figure 2 a working flow chart of the intelligent electric energy meter with error self-detection according to the present application, Figure 3 a flow chart of the signal receiving module judging whether the analog electric signal information has deviation, Figure 4 a flow chart of the signal receiving module judging whether the electric energy meter has error;

[0065] The present application provides an intelligent electric energy meter with error self-detection, comprising,

[0066] a signal sending module, which can generate an analog electric signal information group, and any analog electric signal information group contains a plurality of analog electric signal information;

[0067] a signal receiving module, which receives the analog electric signal information group,

[0068] a signal reading unit, which is connected with the signal receiving module and can read the numerical value of the plurality of analog electric signal information in the analog electric signal information group and output a plurality of received information values;

[0069] a deviation determination unit, which determines whether the analog electric signal information has reading deviation by comparing the analog value of each analog electric signal information with the corresponding received information value, and determines whether the analog electric signal information group has error by the existence of analog electric signal information deviation;

[0070] an error analysis module, which analyzes the cause of reading error by analyzing the difference or ratio between the analog value of each analog electric signal information and the corresponding received information value, determines the type of reading error and the deviation difference value or deviation ratio value of the corresponding type;

[0071] a current sensing module, which includes a shunt and a transformer, and can detect the current on the line during operation and generate a current signal;

[0072] a voltage sensing module, which includes a voltage dividing resistor and a transformer, and can detect the voltage on the line during operation and generate a voltage signal;

[0073] an analog-to-digital conversion module, which is connected with the current sensor and the voltage sensor, and can convert the obtained current signal and voltage signal into digital information;

[0074] a regulation module, which is connected with the analog-to-digital conversion module and the error analysis module, and can correct the digital information converted by the analog-to-digital conversion module according to the analysis result of the error analysis module to calculate the power consumption of the electric energy meter.

[0075] Specifically, in this embodiment, an electric energy meter with a rated voltage of 220V and a maximum current of 10A is selected.

[0076] The signal sending module generates a set of analog electric signal information according to the following rules: a plurality of equidifferent analog voltage information u n is selected in the neighborhood of the center point at 2 / 3 of the maximum current of the electric energy meter. n ;

[0077] In this embodiment, the signal sending module determines a plurality of increasing analog voltage information u n (u1, u2, u3, u4, u5) as 200V, 210V, 220V, 230V, and 240V according to the rated voltage, and determines analog current information i n (i1, i2, i3, i4, i5) as 5.6A, 6.1A, 6.6A, 7.1A, and 7.6A according to the maximum current, and periodically sends the analog voltage information set or the current analog current information set to the signal receiving module along the line alternately.

[0078] By setting the voltage and current detection mechanism, using the voltage test range of rated voltage ± 10% (200V-240V) and the current test range of maximum current 2 / 3 neighborhood (5.6A-7.6A), the problem that the traditional single-point detection cannot cover the full working interval of the electric energy meter is effectively solved, the voltage detection coverage is expanded to ± 10%, the current detection accuracy is improved, and the comprehensiveness of the electric energy meter error identification is significantly improved;

[0079] Specifically, the signal receiving module,

[0080] The signal reading unit can read the numerical values of the plurality of analog voltage information in the analog voltage information group and output a plurality of received voltage values, and can read the numerical values of the plurality of analog current information in the analog current information group and output a plurality of received current values.

[0081] The deviation determination unit obtains the received voltage signal of each signal point in the analog voltage information group through the receiving module, calculates the analog value u n of each analog voltage information, and calculates the corresponding received voltage signal value u n ′ of each analog voltage information. u ;

[0082] ,

[0083] The deviation determination unit determines the voltage deviation ε u , if the voltage deviation ε u is positive, sets the voltage deviation ε u as the voltage deviation contrast value, if the voltage deviation ε u is negative, sets the absolute value of the voltage deviation ε u as the voltage deviation contrast value.

[0084] The voltage deviation contrast value is compared with the threshold value built-in, if the voltage deviation contrast value is less than or equal to the threshold value, it is considered that there is no deviation in the received information, if the voltage deviation contrast value is greater than the threshold value, it is judged that there is deviation in the received information.

[0085] The threshold value is a proportion value, which is 1% in this embodiment.

[0086] The deviation determination unit determines the whole analog voltage information group, if each received information in an analog voltage information group does not exist deviation, the analog voltage information group has no error, and the adjustment module does not correct the digital information converted by the analog-digital conversion module.

[0087] If there are two or more receiving information deviations in the analog voltage information group, it is determined that the analog voltage information group has errors. The error analysis module integrates each receiving information deviation to determine the adjustment mode of the adjustment module, or determines that automatic adjustment cannot be performed.

[0088] If there is only one receiving information deviation, it needs to be determined whether the deviation is a type of deviation. If it is not a type of deviation point, the deviation has no regularity and is an accidental probabilistic event that does not affect the calculation of subsequent power consumption. The analog voltage information generated by the deviation is excluded, and it is considered that the analog voltage information group has no error. If it is a type of deviation point, the generation of the analog voltage information group has errors, and the generation of the deviation has obvious relevance with mechanical errors, which will affect the calculation of subsequent power consumption. The analog voltage information cannot be excluded, and it is considered that the analog voltage information group has errors.

[0089] The deviation determination unit obtains the received current signal of each signal point in the analog current information group through the receiving module, and calculates the analog value i n of each analog current information. n The relative deviation of the corresponding each received current signal value i i is taken as the current deviation ε i .

[0090] ,

[0091] The deviation determination unit determines the current deviation ε i . If the current deviation ε i is positive, the current deviation ε i is set as the current deviation contrast value. If the current deviation ε i is negative, the absolute value of the current deviation ε i is set as the current deviation contrast value.

[0092] The current deviation contrast value is compared with the threshold value built-in. If the current deviation contrast value is less than or equal to the threshold value, it is considered that there is no deviation in the receiving information. If the current deviation contrast value is greater than the threshold value, it is determined that there is a deviation in the receiving information.

[0093] The threshold value is a proportion value, which is 1% in this embodiment.

[0094] The deviation determination unit determines the analog current information group as a whole. If each receiving information in the analog current information group has no deviation, the analog current information group has no error, and the adjustment module does not correct the digital information converted by the analog-to-digital conversion module.

[0095] If there are two or more receiving information deviations in an analog current information group, it is determined that the analog current information group has errors, the error analysis module integrates each receiving information deviation to determine the adjustment mode of the adjustment module, or determines that automatic adjustment cannot be performed;

[0096] If there is only one receiving information deviation, it needs to be determined whether it is a type of deviation. If it is not a type of deviation point, the deviation has no regularity and is an accidental probabilistic event that does not affect the calculation of subsequent power, the analog current information generated by the deviation is excluded, and it is considered that the analog current information group has no error. If it is a type of deviation point, the generation of the analog current information group has errors, and the generation of the deviation has obvious relevance with mechanical errors, which will affect the calculation of subsequent power consumption, and the analog current information cannot be excluded, and it is considered that the analog current information group has errors.

[0097] The signal group endpoint accidental event exclusion mechanism is adopted to effectively distinguish between equipment failure and transient interference through difference approximation analysis, so that the anti-interference ability of the system is improved, the false trigger rate is reduced, the accuracy of the data is maintained, and the stability of the system is maintained.

[0098] Specifically, the error analysis module analyzes the causes of voltage errors. The error analysis module reads the analog electrical signal information output by the signal receiving module, takes the analog electrical signal simulation value as the abscissa and the receiving information value as the ordinate, establishes a rectangular coordinate system of the analog electrical signal information simulation value and the receiving information value, and determines the key points by the analog electrical signal information simulation value and the corresponding receiving value. The change amount of the analog electrical signal information simulation value and the change amount of the receiving information value between each key point are obtained one by one, and the slope between adjacent key points is calculated. The average value and variance s of the slope between each adjacent key point in the analog electrical signal information group are calculated. The change amount of the analog voltage information simulation value is Δu n ′, and the change amount of the receiving information value is Δu n The slope variance is s (taking voltage as an example).

[0099] The voltage formula is

[0100] ,

[0101] The current formula is

[0102] ,

[0103] Wherein, n is the number of analog voltage information in the analog electrical signal information group generated by the signal sending module.

[0104] The error analysis module determines the stability of the information group through the electric signal difference variance s. If the electric signal difference variance s is greater than the threshold value, it is determined that the numerical fluctuation of the analog electric signal group is large, and the signal transmitting device needs to be manually adjusted or replaced. If the electric signal difference variance s is less than or equal to the threshold value, it is determined that the analog electric signal information group is stable and has a judgment value. The error in the analog voltage information group is determined by the average slope value. According to the size of the average slope value, the causes of the error can be divided into three types,

[0105] The mechanical error is the cause of the error between the analog electric signal information simulation value and the received information value within the average slope value mechanical error evaluation value;

[0106] The mechanical error evaluation value is greater than or equal to 0.95 and less than 1.1;

[0107] The system error is the cause of the error between the analog electric signal information simulation value and the received information value when the average slope value is not within the mechanical error evaluation range;

[0108] For the system error, if the initial error value is less than or equal to the maximum deviation value of the smallest analog electric signal information allowed in the analog electric signal information group, it is determined to be a single system error. Otherwise, it is determined to be a composite system error;

[0109] The initial error value is the average of the composite judgment value b plus the system error of the analog electric signal information at the first key point. The composite judgment value b n is the analysis of the analog value and the received value of any key point in the analog electric signal information simulation value-received information value curve, to determine the composite judgment value b n corresponding to the key point (taking voltage as an example);

[0110] Voltage formula,

[0111] ,

[0112] Current formula,

[0113] ,

[0114] The error analysis module compares the composite judgment value variance e with the composite judgment value variance evaluation value. If the composite judgment value variance is greater than the composite judgment value variance evaluation value, the composite judgment value has large fluctuations and the information group has defects, which needs to be reported and manually adjusted or replaced. If the composite judgment value variance is less than or equal to the composite judgment value variance evaluation value, the composite judgment value is relatively stable. At this time, the initial error value W can be used to judge whether there is a mechanical error and the size of the mechanical error value difference in the presence of system error. The initial error value is the composite judgment value b nThe average value of the slope of the analog electric signal information group is calculated, and the system error generated when the initial information (the minimum analog value of the analog information group) is added to the analog electric signal information is analyzed (threshold control). If the initial error value is greater than the maximum deviation of the minimum analog value of the analog electric signal information, the mechanical error and the system error of the electric energy meter exist simultaneously, and there is a composite system error. If the initial error value is less than or equal to the maximum deviation of the minimum analog value of the analog electric signal information, the electric energy meter only has a system error.

[0115] The three-level accurate identification of mechanical error, single system error and composite system error is realized by dynamically calculating the average value of the slope of the analog electric signal information group and analyzing the variance (threshold control) combined with the composite judgment value. This technology realizes the leap from "single error hypothesis" to "composite system error analysis" through a dynamic analysis model of multiple parameter coupling, and provides a complete error management path for high-precision electric energy metering.

[0116] After determining the error reason of the electric energy meter, the error difference or the error ratio of the electric energy meter is confirmed. When the electric energy meter only has a mechanical error, the error analysis module calculates the average difference between the analog value of the analog electric signal information and the received information value to analyze the error difference of the mechanical error (taking voltage as an example).

[0117] Voltage formula,

[0118] ,

[0119] Current formula,

[0120] ,

[0121] When the electric energy meter has a single system error, the error analysis module determines the error ratio of the error of the electric energy meter. The error ratio is equal to the average slope of the analog electric signal information analog value-received information value image of the analog electric signal information group.

[0122] ,

[0123] When the electric energy meter has a composite system error, the error analysis module determines the error ratio Y of the system error by the average slope of the analog electric signal information analog value-received information value image, and determines the mechanical error difference X by the initial error value W.

[0124] Constant mechanical error compensation addresses fixed deviations such as sensor zero-point offset by using difference averaging calibration to directly eliminate basic range errors. System error proportional correction restores signal transmission linearity by dynamically adjusting the range factor through the slope mean to correct linear distortion in the signal amplification link. Composite system error joint calibration innovatively integrates composite judgment value analysis and initial error verification. In voltage detection cases, it reduces initial errors through dual-parameter collaborative compensation, overcoming the limitations of traditional single-correction modes. This mechanism can adaptively handle various errors within the -20% to +120% range, maintaining ±0.05% measurement accuracy even under complex conditions such as sudden load increases and temperature drift, offering 20 times better anti-interference capability than single-dimensional correction methods.

[0125] In this embodiment, the process for determining mechanical errors is as follows;

[0126] The error analysis module analyzes the mechanical error difference X, determines whether the error in the analog voltage information group belongs to the voltage mechanical error, and calculates the average voltage difference. In this embodiment, the voltage values ​​in the analog voltage information group are 200V, 210V, 220V, 230V, and 240V, respectively. If the voltage values ​​received by the data receiving module are 195.1V, 205.3V, 214.9V, 224.9V, and 235.1V, respectively, the received information value is substituted into formula (3) to obtain the change value Δu of the received information value. n ′ is 10.2, 9.9, 10, 10.2. Substituting the analog values ​​of the analog electrical signal information into formula (4) yields the analog value change Δu. n The received information value changes by Δu, where Δu is 10, 10, 10, 10. n ′ and the change in simulated value Δu n Substituting into formula (5), we obtain the slope k of each analog electrical signal information interval to the next analog electrical signal information interval. n The slope k, defined as 1.02, 0.99, 1.00, and 1.00, represents the slope k within the next analog electrical signal information interval. n Substituting this into formula (6), we obtain an average slope of 1.0025 within the analog electrical signal information group. The slope k between each analog electrical signal information interval and the next analog electrical signal information interval is then calculated. n与 Substituting the average slope of the analog electrical signal information group into formula (7) yields the electrical signal difference variance s of 0.000119, which is less than the threshold. Therefore, the analog electrical signal information group is considered stable and has judgment value. The average slope of the analog electrical signal information group belongs to the mechanical error range, and it is determined that the analog electrical signal information group only has mechanical error.

[0127] The mechanical error difference is calculated by substituting the analog value of the analog electrical signal information and the received information value into formula (11) to obtain the difference u. xn4.9, 4.7, 5.1, 5.1, 4.9, and according to formula (12), the average difference value is 4.94, and the average difference value is equal to the mechanical error difference X of the electric energy meter.

[0128] In this embodiment, the judgment process of the system error or the composite system error is as follows:

[0129] The error analysis module analyzes the electric signal ratio variance s and the system error ratio Y. In this embodiment, the voltage values in the analog electric signal information group are 200V, 210V, 220V, 230V, and 240V, respectively. If the voltage values received by the data receiving module are 180.2, 189.1, 197.9, 206.8, and 216.1, respectively, the received information value is brought into formula (3) to obtain the received information value change Δu n = 8.9, 8.8, 8.9, and 10, the analog electric signal information simulation value is brought into formula (4) to obtain the analog value change Δu n = 10, 10, 10, and 10, the received information value change Δu n and the analog value change Δu n are brought into formula (5) to obtain the slope k of each analog electric signal information to the next analog electric signal information interval n = 0.89, 0.88, 0.89, and 1.00, the slope k of each analog electric signal information to the next analog electric signal information interval n is brought into formula (6) to obtain the average slope of the analog electric signal information group, which is 0.915 n The average slope of the analog electric signal information group is brought into formula (7) to obtain the electric signal difference variance s, which is 0.00243, less than the threshold value. It is determined that the analog electric signal information group is stable and has a judgment value. The average slope of the analog electric signal information group belongs to the system error interval. It is determined that the analog electric signal information group has a system error. The analog electric signal information simulation value-received information value curve is drawn according to the analog electric signal information simulation value and the received information value. The curve is analyzed and a first order function is determined. The intercept b of the first order function is calculated by bringing each analog information simulation value and the received information value into formula (8). nThe values ​​are 2.8, 3.15, 4.3, 3.65, and 3.5. Substituting the composite judgment values ​​into formula (9) yields an average composite judgment value of 3.48. Substituting the average composite judgment value into formula (10) yields a composite judgment value variance e of 0.25, which is less than the composite judgment value variance evaluation value. The composite judgment value is relatively stable. The average intercept, when added to the initial position (simulation information is 200V), is the system error value already generated. The initial error value is 186.84, and the difference between it and the analog value of the analog electrical signal information is 13.96, which is less than the maximum allowable deviation value of the initial analog value (200×10%). This deviation only has a system error and no mechanical error. The system error difference Y is 0.951.

[0130] In this embodiment, the process for determining mechanical errors is as follows;

[0131] The error analysis module analyzes the mechanical error difference X, determines whether the error within the simulated current information group belongs to the current mechanical error, and calculates the average current difference. In this embodiment, the current values ​​within the simulated current information group are 5.6A, 6.1A, 6.6A, 7.1A, and 7.6A, respectively. If the current values ​​received by the data receiving module are 4.6A, 5.11A, 5.63A, 6.12A, and 6.61A, respectively, the received information values ​​are substituted into formula (3) to obtain the change value Δi of the received information value. n The values ​​of ′ are 0.51, 0.52, 0.49, and 0.49. Substituting the analog values ​​of the analog electrical signal information into formula (4) yields the analog value change Δi. n The values ​​are 0.5, 0.5, 0.5, 0.5, and the change in the received information value Δi is calculated. n ′ and the change in simulated value Δi n Substituting into formula (5), we obtain the slope k of each analog electrical signal information interval to the next analog electrical signal information interval. n The values ​​are 1.02, 1.04, 0.98, and 0.98, representing the slope k of the analog electrical signal information to the next analog electrical signal information interval. n Substituting this into formula (6), we obtain an average slope of 1.005 within the analog electrical signal information group. The slope k between each analog electrical signal information interval and the next analog electrical signal information interval is then calculated. n Substituting the average slope of the analog electrical signal information group into formula (7) yields an electrical signal difference variance s of 0.000675, which is less than the threshold. Therefore, the analog electrical signal information group is considered stable and has judgment value. The average slope of the analog electrical signal information group belongs to the mechanical error range, and it is determined that the analog electrical signal information group only has mechanical error.

[0132] The mechanical error difference is calculated by substituting the analog value of the analog electrical signal information and the received information value into formula (11) to obtain the difference u. xn0.99, 0.97, 0.98, 0.99, and according to formula (12), the difference average value is 0.99, and the difference average is equal to the mechanical error difference X of the electric energy meter.

[0133] In the embodiment, the judgment process of the system error or the composite system error is as follows.

[0134] The error analysis module analyzes the electric signal difference s and the system error ratio Y. The current values in the analog current information group are 5.6 A, 6.1 A, 6.6 A, 7.1 A, and 7.6 A, respectively. If the current values received by the data receiving module are 4.023 A, 4.371 A, 4.723 A, 5.067 A, and 5.419 A, respectively, the received information value is brought into formula (3) to obtain the received information value change Δu n 0.348, 0.352, 0.344, and 0.352. The analog electric signal information simulation value is brought into formula (4) to obtain the analog value change Δi n 0.5, 0.5, 0.5, and 0.5. The received information value change Δi n and the analog value change Δi n are brought into formula (5) to obtain the slope k of each analog electric signal information to the next analog electric signal information interval. n 0.696, 0.704, 0.688, and 0.704. The slope k of each analog electric signal information to the next analog electric signal information interval is brought into formula (6) to obtain the slope average value of the analog electric signal information group, which is 0.698. n The slope k of each analog electric signal information to the next analog electric signal information interval is brought into formula (6) to obtain the slope average value of the analog electric signal information group, which is 0.698. n The slope average value of the analog electric signal information group is brought into formula (7) to obtain the electric signal difference s, which is 0.000044, less than the threshold value. It is determined that the analog electric signal information group is stable and has a judgment value. The slope average value of the analog electric signal information group belongs to the system error interval. It is determined that the analog electric signal information group has a system error. The analog electric signal information simulation value-received information value curve is drawn according to the analog electric signal information simulation value and the received information value. The curve is analyzed and a first-order function of the curve is determined. The analog information simulation value and the received information value are brought into formula (8) to calculate the intercept b of the first-order function as the composite evaluation value. nThe average of the composite judgment value is 0.113 by substituting the intercept into formula (9), and the composite judgment value variance e is 0.00000296 less than the composite judgment value variance evaluation value by substituting the average of the composite judgment value into (10), the composite judgment value is relatively stable, and the average of the composite evaluation value plus the system error value generated when the initial position (the simulation information is 5.6A) is 4.022, which is the sum of the initial error value, and the difference between the simulation value of the simulation signal information is 1.578 greater than the allowed maximum deviation value of the initial simulation value 0.56, this deviation only exists in the system error and does not exist in the mechanical error, the system error value Y is 0.698, and the mechanical error value is the initial error value 0.133;

[0135] Specifically, the adjustment module adopts different adjustment methods for different errors,

[0136] When the current of the electric energy meter does not exist error, if the voltage does not exist error, the result is directly output without adjustment;

[0137] When the current of the electric energy meter does not exist error, if the voltage only exists mechanical error, the voltage mechanical error value X u The error of the electric energy meter is corrected;

[0138] When calculating the power consumption of the electric energy meter, the measured current value is used as the current, and the measured voltage value is reduced by the voltage mechanical error value X u as the voltage to calculate the power consumption;

[0139] When the current of the electric energy meter does not exist error, if the voltage only exists system error, the voltage system error proportion Y u The error of the electric energy meter is corrected;

[0140] When calculating the power consumption of the electric energy meter, the measured current value is used as the current, and the measured voltage is multiplied by the voltage system error proportion Y u as the voltage to calculate the power consumption;

[0141] When the current of the electric energy meter does not exist error, if the voltage exists composite system error, the voltage mechanical error value X u , the voltage system error proportion Y u The error of the electric energy meter is corrected;

[0142] When calculating the power consumption of the electric energy meter, the measured current value is used as the current, and the measured voltage is multiplied by the voltage system error proportion Y u value and then reduced by the mechanical error value X u as the voltage to calculate the power consumption;

[0143] When the current of the electric energy meter only has mechanical error, if the voltage only has mechanical error, the mechanical error difference value X of the current i The error of the electric energy meter is corrected.

[0144] When calculating the power consumption of the electric energy meter, the measured current value is reduced by the mechanical error difference value X i The power consumption is calculated as the current, the measured voltage value as the voltage.

[0145] ,

[0146] When the current of the electric energy meter only has mechanical error, if the voltage only has mechanical error, the mechanical error difference value X of the current i , the mechanical error difference value X of the voltage u The error of the electric energy meter is corrected.

[0147] When calculating the power consumption of the electric energy meter, the measured current value is reduced by the mechanical error difference value X i The power consumption is calculated as the current, the measured voltage value reduced by the mechanical error difference value X of the voltage. u The power consumption is calculated as the voltage.

[0148] ,

[0149] When the current of the electric energy meter only has mechanical error, if the voltage only has system error, the mechanical error difference value X of the current i , the system error proportion Y of the voltage u The error of the electric energy meter is corrected.

[0150] When calculating the power consumption of the electric energy meter, the measured current value is reduced by the mechanical error difference value X i The power consumption is calculated as the current, the measured voltage multiplied by the system error proportion Y of the voltage. u The power consumption is calculated as the voltage.

[0151] ,

[0152] When the current of the electric energy meter only has mechanical error, if the voltage has compound system error, the mechanical error difference value X of the current i , the system error proportion Y of the voltage u , the mechanical error difference value X of the voltage u The error of the electric energy meter is corrected.

[0153] When calculating the power consumption of the electric energy meter, the measured current value is reduced by the mechanical error difference value X i The power consumption is calculated as the current, the measured voltage value added by itself multiplied by the system error proportion Y and then reduced by the mechanical error difference value X u The power consumption is calculated as the voltage. u The power consumption is calculated as the voltage.

[0154] ,

[0155] When the current in the electricity meter has only a systematic error, if the voltage has no error, the ratio of the current systematic error to X is used. i Correcting the error of the electricity meter;

[0156] When calculating the electricity consumption of an electricity meter, the measured current is multiplied by the current system error ratio to obtain the current, and the measured voltage value is used as the voltage to calculate the electricity consumption.

[0157] ,

[0158] When the current in an electricity meter has only a systematic error, and the voltage has only a mechanical error, the ratio of the current systematic error to Y is used. i Voltage mechanical error difference X u Correcting the error of the electricity meter;

[0159] When calculating the electricity consumption of an electricity meter, the measured current is multiplied by the current system error ratio Y. i As the current, the measured voltage value minus the voltage mechanical error difference X u As a measure of electricity consumption for voltage calculation;

[0160] ,

[0161] When the current in the electricity meter has only a systematic error, and the voltage has only a systematic error, the ratio of the current systematic error to Y is used. i Voltage system error ratio Y u Correcting the error of the electricity meter;

[0162] When calculating the electricity consumption of an electricity meter, the measured current is multiplied by the current system error ratio Y. i As the current, multiply the measured voltage by the voltage system error ratio Y. u As a measure of electricity consumption for voltage calculation;

[0163] ,

[0164] When the current in the electricity meter only has a systematic error, if the voltage has a composite systematic error, the ratio of the current systematic error to Y is used. i Voltage system error ratio Y u Voltage mechanical error difference X u Correcting the error of the electricity meter;

[0165] When calculating the electricity consumption of an electricity meter, the measured current is multiplied by the current system error ratio Y. i As the current, multiply the measured voltage by the voltage system error ratio Y. u The value minus the mechanical error difference Xu As a measure of electricity consumption for voltage calculation;

[0166] ,

[0167] When there is a composite systematic error in the current of the electricity meter, if there is no error in the voltage, the current systematic error ratio Y is used. i Current mechanical error difference X i Correcting the error of the electricity meter;

[0168] When calculating the electricity consumption of an electricity meter, multiply the measured current by the current system error ratio and subtract the current mechanical error difference X. i The measured voltage value is used as the current to calculate the power consumption;

[0169] ,

[0170] When there is a composite systematic error in the current of an electricity meter, if the voltage only has a mechanical error, the ratio of the current systematic error to Y is used. i Current mechanical error difference X i Voltage mechanical error difference X u Correcting the error of the electricity meter;

[0171] When calculating the electricity consumption of an electricity meter, the measured current is multiplied by the current system error ratio Y. i The value minus the current mechanical error difference X i As the current, the measured voltage value minus the mechanical error difference X u As a measure of electricity consumption for voltage calculation;

[0172] ,

[0173] When there is a composite systematic error in the current of an electricity meter, if the voltage only has a systematic error, the ratio of the current systematic error to Y is used. i Current mechanical error difference X i Voltage system error ratio Y u Correcting the error of the electricity meter;

[0174] When calculating the electricity consumption of an electricity meter, the measured current is multiplied by the current system error ratio Y. i The value minus the current mechanical error difference X i As the current, the measured voltage is multiplied by the voltage system error ratio Y. u As a measure of electricity consumption for voltage calculation;

[0175] ,

[0176] When there is a composite systematic error in the current of the electricity meter, if there is also a composite systematic error in the voltage, the current systematic error ratio Y is used.i Current mechanical error difference X i Voltage system error ratio Y u Voltage mechanical error difference X u Correcting the error of the electricity meter;

[0177] When calculating the electricity consumption of an electricity meter, the measured current is multiplied by the current system error ratio Y. i The value minus the current mechanical error difference X i As the current, multiply the measured voltage by the voltage system error ratio Y. u The value minus the mechanical error difference X u As a measure of electricity consumption for voltage calculation;

[0178] ,

[0179] This adjustment module provides differentiated correction strategies for nine combined scenarios of mechanical errors, systematic errors, and complex systematic errors in the current and voltage of electricity meters, covering all types of error scenarios, including single errors and complex systematic errors. By accurately identifying the source of error and dynamically matching correction parameters, it achieves fine differentiation and targeted compensation of error types, significantly improving the applicability and coverage of the correction strategies. Precise error compensation reduces reliance on high-cost sensors and minimizes grid disputes and economic losses caused by metering errors, resulting in both social and economic benefits. Through fine-grained identification of error types and dynamic matching of compensation strategies, this adjustment module achieves an order-of-magnitude improvement in the metering accuracy of electricity meters, while possessing strong engineering applicability and low maintenance costs, providing an innovative solution for high-precision metering in smart grids.

[0180] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

[0181] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An intelligent electric energy meter with error self-detection, characterized in that, a signal sending module capable of generating a set of analog electric signal information, any set of analog electric signal information containing a plurality of analog electric signal information; a signal receiving module receiving the set of analog electric signal information, a signal reading unit connected to the signal receiving module, capable of reading the numerical values of the plurality of analog electric signal information in the set of analog electric signal information, and outputting a plurality of received information values; a deviation determination unit determining whether the analog electric signal information has reading deviation by comparing the analog values of each analog electric signal information with the corresponding received information values, and determining whether the set of analog electric signal information has error by the existence of analog electric signal information deviation; an error analysis module analyzing the causes of reading error by analyzing the difference or ratio between the analog values of each analog electric signal information and the corresponding received information values, determining the type of reading error and the corresponding type of deviation difference or deviation ratio; a current sensing module including a shunt and a transformer, capable of detecting the current on the line during operation and generating a current signal; a voltage sensing module including a voltage dividing resistor and a transformer, capable of detecting the voltage on the line during operation and generating a voltage signal; an analog-to-digital conversion module connected to the current sensor and the voltage sensor, capable of converting the current signal and the voltage signal obtained by the sensors into digital information; an adjustment module connected to the analog-to-digital conversion module and the error analysis module, capable of correcting the digital information converted by the analog-to-digital conversion module according to the analysis results of the error analysis module to calculate the power consumption of the electric energy meter; the error analysis module establishes a rectangular coordinate system of analog electric signal information analog values and received information values with analog electric signal information analog values as the abscissa and received information values as the ordinate, determines the key points by the points determined by the analog electric signal information analog values and their corresponding received values, obtains each key point one by one and calculates the slope between adjacent key points, calculates the average and variance of the slope between each adjacent key point in the set of analog electric signal information, determines the stability of the data by the variance of the slope, and determines the causes of error by the average of the slope; the error analysis module further analyzes the causes of error by introducing a composite judgment value; the error analysis module determines the stability of the set of analog electric signal information by the variance of the slope, and if the slope variance is greater than the threshold value, it is determined that the numerical fluctuation of this set of analog electric signal information is large and has no judgment value, and if the slope variance is less than or equal to the threshold value, it is determined that the numerical fluctuation of this set of analog electric signal information is small and has judgment value; the error analysis module divides the causes of error of the set of analog electric signal information with slope variance less than or equal to the threshold value into mechanical error and systematic error by the average of the slope, mechanical error is the cause of error between the analog electric signal information analog values and the received information values when the average of the slope is within the mechanical error evaluation range; systematic error is the cause of error between the analog electric signal information analog values and the received information values when the average of the slope is not within the mechanical error evaluation range. For the system error, if the initial error value is less than or equal to the maximum deviation difference value of the smallest analog signal information allowed to exist in the analog signal information group, it is determined to be a single system error, otherwise, it is determined to be a composite system error; Wherein, The initial error value is the average value of the composite judgment value plus the system error of the analog signal information at the first key point.

2. The intelligent electric energy meter with error self-detection according to claim 1, wherein The analog signal information group includes an analog current signal information group and an analog voltage signal information group, wherein The analog current signal information group includes a plurality of current signal information with increasing values; The analog voltage signal information group includes a plurality of voltage signal information with increasing values.

3. The intelligent electric energy meter with error self-detection according to claim 1, wherein The deviation determination unit calculates the difference between the analog value of any analog signal information and the corresponding received information value, and calculates the difference value ratio, and determines whether the received information value output by the signal reading unit has deviation through the difference value ratio.

4. The intelligent electric energy meter with error self-detection according to claim 1, wherein The deviation determination unit calculates the difference between the analog value of any analog signal information and the corresponding received information value, and integrates the difference values of the same group of analog signal information group, and determines whether the reading deviation belongs to a type of deviation according to the analysis of the integrated data; The type of deviation is that the reading deviation occurs at the smallest analog signal information of the same group of analog signal information, and the variance of the difference values of the same group of analog signal information is less than the evaluation value.

5. The intelligent electric energy meter with error self-detection according to claim 4, wherein The deviation determination unit analyzes the electric signal information in the analog signal information group, if the type of deviation exists, or if there are two or more reading deviations, it is determined that there is an error in this analog signal information group, if the type of deviation does not exist, and if there is one or less reading deviation, it is determined that there is no error in this analog signal information group.

6. The intelligent electric energy meter with error self-detection according to claim 5, wherein When the electric energy meter only has the mechanical error, the error analysis module calculates the average difference value of the difference between the analog signal information analog value and the received information value to analyze the error difference value of the mechanical error; When the electric energy meter has the single system error, the error analysis module determines the error ratio value of the system error of the electric energy meter through the average slope of the analog signal information group; When the electric energy meter has the composite system error, the error analysis module determines the error difference value of the mechanical error and the error ratio value of the system error of the electric energy meter through the average difference value and the average slope.

7. The intelligent electric energy meter with error self-detection according to claim 6, wherein The adjustment module determines the adjustment method of the display data of the electric energy meter through the signal type simulated by the analog signal information group with error. The adjustment module determines the adjustment method of the electric energy meter detection data according to the determined cause of the generated current error when only the analog current information group generates error; The adjustment module determines the adjustment method of the electric energy meter detection data according to the determined cause of the generated voltage error when only the analog voltage information group generates error; The adjustment module determines the adjustment method of the electric energy meter detection data according to the determined cause of the generated current error and the cause of the voltage error when both the analog current information group and the analog voltage information group generate error.

8. The intelligent electric energy meter with error self-detection according to claim 7, characterized in that, The adjustment module adjusts the display data of the electric energy meter by the type of error when the analog electric signal information group of the current generates error, When only mechanical error exists, the adjustment module corrects the error by subtracting the mechanical error value from the current value output by the analog-digital conversion module; When only single system error exists, the adjustment module corrects the error by multiplying the current value output by the analog-digital conversion module by the error proportion; When composite system error exists, the adjustment module corrects the error by subtracting the mechanical error value from the current value output by the analog-digital conversion module and multiplying the current value output by the analog-digital conversion module by the error proportion; The adjustment module adjusts the display detection data of the electric energy meter by the cause of the generated error when the analog voltage information group generates error, When only mechanical error exists, the adjustment module corrects the error by subtracting the mechanical error value from the voltage value output by the analog-digital conversion module; When only single system error exists, the adjustment module corrects the error by multiplying the voltage value output by the analog-digital conversion module by the error proportion; When composite system error exists, the adjustment module corrects the error by subtracting the mechanical error value from the voltage value output by the analog-digital conversion module and multiplying the voltage value output by the analog-digital conversion module by the error proportion.

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