Intelligent electric energy meter with error self-detection function

Abstract

The invention relates to the technical field of intelligent meter measurement, in particular to an intelligent electric energy meter with error self-detection, which comprises a signal transmitting module, a signal receiving module, an error analysis module, a current sensing module, a voltage sensing module, an analog-to-digital conversion module and an adjusting module. The signal transmitting module alternately transmits a voltage test group in a range of plus or minus 10% of rated voltage and a current test group based on 2 / 3 neighborhood of maximum current, so that full-scale coverage detection is realized. And the signal receiving module adopts difference value approach analysis to eliminate end point accidental interference, and combines double-layer variance and a difference value analysis algorithm to accurately identify mechanical errors, system errors and composite system error types. The adjusting module is configured with multiple dynamic compensation strategies, and accurate correction is achieved through composite operation according to a voltage and current error combination scene. The problems that a traditional electric energy meter is incomplete in error detection coverage, weak in interference resistance and single in compensation are solved, and the metering precision and the system stability are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of smart meter measurement, and in particular to a smart electricity meter with self-error detection function. Background Art

[0002] An electricity meter composed of a measurement unit, a data processing unit, a communication unit, etc., having functions such as electric energy metering, data processing, real-time monitoring, automatic control, and information interaction. Smart electricity meters can be divided into single-phase meters and three-phase meters according to user types. According to different payment methods, they can be divided into local meters and remote meters. As the name implies, a single-phase meter is an electricity meter used to measure the 220V electricity used by ordinary users. A three-phase meter is an electricity meter used to measure the 380V electricity used in industry. A local meter is an electricity meter that can use an IC card to pay at the user side. A remote meter is generally not installed within the user's scope. Users need to go to the power supply bureau to pay the bill.

[0003] Chinese Patent Publication No.: CN111413660A discloses a test method and system for the self-error detection function of an electricity meter, including a regulation module setting a control signal and sending 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 the self-detection signal of the electricity meter, amplifies or reduces the amplitude of the self-detection signal of the electricity meter in response to the control signal to generate 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 into the electricity meter for the self-error detection function test. After obtaining the theoretical result value and the self-detection result value, the difference between the two values is compared with a preset difference range.

[0004] It can be seen that the test method and system for the self-error detection function of the electricity meter have the following problems:

[0005] Lack of analysis and determination of the theoretical value and the self-detection result value may lead to inaccurate obtained information;

[0006] Lack of analysis of the cause of the fault will lead to the inability to accurately confirm the cause of the fault and inaccurate adjustment. Summary of the Invention

[0007] Therefore, the present invention provides a smart electricity meter with self-error detection function to overcome the problem of inaccurate adjustment in the prior art.

[0008] To achieve the above object, the present invention provides a smart electricity meter with self-error detection function, including

[0009] A signal transmission module, which is capable of generating a group of analog electrical signal information, and each group of analog electrical signal information contains several analog electrical signal information;

[0010] A signal reception module, which receives the group of analog electrical signal information,

[0011] A signal reading unit, which is connected to the signal reception module and is capable of reading the numerical values of several analog electrical signal information in the group of analog electrical signal information and outputting several received information values;

[0012] A deviation determination unit determines whether there is a reading deviation of the analog electrical signal information by comparing the analog values of each analog electrical signal information with the corresponding received information values, and determines whether there is an error in the group of analog electrical signal information based on the existence of the deviation of the analog electrical signal information.

[0013] An error analysis module analyzes the reasons for the reading error by analyzing the difference or ratio between the analog values of each analog electrical signal information and the corresponding received information values, and determines the type of reading error and the deviation difference or deviation ratio of the corresponding type;

[0014] 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;

[0015] 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;

[0016] An analog-to-digital conversion module, which is respectively connected to the current sensor and the voltage sensor, and can convert the current signal and the voltage signal obtained by the sensors into digital information;

[0017] An adjustment module, which is respectively connected to the analog-to-digital converter and the deviation analysis module, and can correct the digital information converted by the analog-to-digital conversion module according to the analysis result of the deviation analysis module to calculate the power consumption of the watt-hour meter.

[0018] Further, the group of analog electrical signal information includes an analog current signal information group and an analog voltage signal information group, where,

[0019] The analog current signal information group includes several current signal information with increasing numerical values;

[0020] The analog voltage signal information group includes several voltage signal information with increasing numerical values.

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

[0022] Further, the deviation determination unit subtracts the analog value of any analog electrical signal information from the corresponding received information value, integrates the differences of the same group of analog electrical signal information groups, and determines whether the reading deviation belongs to a type I deviation according to the analyzed and integrated data;

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

[0024] Further, the deviation determination unit analyzes the electrical signal information within the analog electrical signal information group. If there is the type I deviation, or there are two or more reading deviations, it is determined that there is an error in this analog electrical signal information group. If there is no type I deviation and there is one or less reading deviation, it is determined that there is no error in this analog electrical signal information group.

[0025] Further, the error analysis module obtains the slope of the analog value difference of each segment by calculating the quotient of the difference between the analog value of each segment of analog electrical signal information within the analog electrical signal information group with error and the difference of each segment of received value, calculates the average value and variance of each segment of slope, 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 electrical signal information group through the variance of the slope. If the slope variance is greater than the threshold, it is considered that the numerical fluctuation of this analog electrical signal group is large and has no judgment value. If the slope variance is less than or equal to the threshold, it is considered that the numerical fluctuation of this analog electrical signal group is small and has judgment value;

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

[0029] Mechanical error is the cause of the error between the analog value of the analog electrical signal information 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] The systematic error is the cause of the error between the simulated value of the analog electrical signal information and the received information value when the average value of the slope is less than 0.95 or greater than or equal to 1.1.

[0031] The composite systematic error is a special case of the systematic error. When there is a systematic error in the electricity meter, a composite judgment value is introduced at this time to determine the initial error value to determine the initial error to determine whether there is a mechanical error at the same time. If the initial error value is greater than the difference between the maximum deviation allowed for the smallest analog electrical signal information in the analog electrical signal information group, then the mechanical error and the systematic error of the electricity meter exist at the same time, and there is the composite systematic error. If the initial error value is less than or equal to the difference between the maximum deviation allowed for the smallest analog electrical signal information in the smallest analog electrical signal information, then the electricity meter only has the systematic error.

[0032] Further, when the electricity meter only has the mechanical error, the error analysis module calculates the average difference based on the difference between the simulated value of the analog electrical signal information and the received information value to analyze the error difference of the mechanical error.

[0033] When there is a systematic error in the electricity meter, the error analysis module determines the error ratio of the systematic error of the electricity meter through the average slope of the analog electrical signal information group.

[0034] When there is a composite systematic error in the electricity meter, the error analysis module further judges through the above two methods to respectively determine the error difference of the mechanical error and the error ratio of the systematic error of the electricity meter.

[0035] Further, the adjustment module determines the adjustment method of the display data of the electricity meter according to the signal type simulated by the analog electrical signal information group that generates the error.

[0036] When only the analog current information group generates an error, the adjustment module adjusts the detection data of the electricity meter according to the determined cause of the current error.

[0037] When only the analog voltage information group generates an error, the adjustment module adjusts the detection data of the electricity meter according to the determined cause of the voltage error.

[0038] When there are errors in both the analog current information group and the analog voltage information group, the adjustment module determines the adjustment method of the detection data of the electricity meter by combining the cause of the current error and the cause of the current error.

[0039] Further, when an error occurs in the analog electrical signal information group of the current, the adjustment module adjusts the display data of the electricity meter according to the type of the error.

[0040] When there is only mechanical error, the adjustment module corrects the error by subtracting the mechanical error difference from the current value output by the analog-to-digital conversion module;

[0041] When there is only systematic error, the adjustment module corrects the error by multiplying the current value output by the analog-to-digital conversion module by the error ratio;

[0042] When there is a composite systematic error, the adjustment module corrects the error by subtracting the mechanical error difference 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 adjustment module generates an error in the analog voltage information group, it adjusts the power meter display detection data according to the cause of the error

[0044] When there is only mechanical error, the adjustment module corrects the error by subtracting the mechanical error difference from the voltage value output by the analog-to-digital conversion module;

[0045] When there is only systematic error, the adjustment module corrects the error by multiplying the voltage value output by the analog-to-digital conversion module by the error ratio;

[0046] When there is a composite systematic error, the adjustment module corrects the error by subtracting the mechanical error difference from the voltage value output by the analog-to-digital conversion module and multiplying the value output by the analog-to-digital conversion module by the error ratio.

[0047] Compared with the prior art, the beneficial effect of the present invention is that the signal transmission module effectively solves the problem that traditional single-point detection cannot cover the entire working range of the power meter by setting an alternating voltage and current detection mechanism, adopting a voltage test range of rated voltage ±10% (200V - 240V) and a current test range of the maximum current 2 / 3 neighborhood (5.6A - 7.6A), expands the voltage detection coverage range to ±10%, improves the current detection accuracy, and significantly improves the comprehensiveness of power meter error identification.

[0048] Furthermore,

[0049] The signal receiving module adopts a signal group endpoint accidental event exclusion mechanism, effectively distinguishes equipment failures from instantaneous interference through difference proximity analysis, improves the anti-interference ability of the system, reduces the false trigger rate, and maintains the accuracy of the data and the stability of the system.

[0050] Furthermore,

[0051] The error analysis module innovatively adopts a double-layer error discrimination algorithm that combines variance analysis and difference comparison. By calculating the comparison between the difference variance value of the signal group and the pre-deviation evaluation value, it realizes the precise classification of mechanical errors, systematic errors, and composite systematic errors, significantly improving the accuracy rate of error type recognition compared with traditional methods and reducing the misjudgment rate at the same time.

[0052] Furthermore,

[0053] The use of variance and mean in error analysis is to distinguish random errors and systematic errors. Mechanical errors are usually fixed offsets, while systematic errors may show a proportional relationship. By calculating the variance, it can be determined whether the errors are consistent, thus determining the type. The correction strategy is adjusted according to different combinations of error types to ensure coverage of all possible error situations and improve the accuracy of correction.

[0054] Furthermore,

[0055] This adjustment module provides differential correction strategies for various combined scenarios of mechanical errors, systematic errors, and composite systematic errors of the current and voltage of the electricity meter, covering all types of error scenarios of single errors and composite systematic errors. By accurately identifying the error sources and dynamically matching the correction parameters, it realizes the refined differentiation of error types and targeted compensation, significantly improving the applicability and coverage of the correction strategy. Through accurate error compensation, it can reduce the dependence on high-cost sensors, and at the same time reduce grid disputes and economic losses caused by measurement errors, achieving a double improvement in social and economic benefits. This adjustment module realizes an order-of-magnitude improvement in the measurement accuracy of the electricity meter through the refined identification of error types and the dynamic matching of compensation strategies, and at the same time has strong engineering applicability and low maintenance costs, providing an innovative solution for high-precision metering in smart grids. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 is a schematic structural diagram of the intelligent electricity meter with error self-detection according to the present invention;

[0057] Figure 2 is a working flow chart of the intelligent electricity meter with error self-detection according to the present invention;

[0058] Figure 3 is a flow chart for the signal receiving module to determine whether there is a deviation in the analog electrical signal information according to the present invention;

[0059] Figure 4 is a flow chart for the signal receiving module to determine whether there is an error in the electricity meter according to the present invention; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0060] In order to make the objectives and advantages of the present invention more clearly understood, the present invention will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

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

[0062] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for 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 should not be construed as a limitation of the present invention.

[0063] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0064] Please refer to Figures 1-4 as shown in Figure 1 the structural schematic diagram of the intelligent electric energy meter with error self-detection according to the present invention, Figure 2 the working flowchart of the intelligent electric energy meter with error self-detection according to the present invention, Figure 3 the flowchart of the signal receiving module for determining whether there is a deviation in the analog electrical signal information according to the present invention, Figure 4 the flowchart of the signal receiving module for determining whether there is an error in the electric energy meter according to the present invention;

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

[0066] a signal sending module, which can generate a group of analog electrical signal information, and each group of analog electrical signal information contains several pieces of analog electrical signal information;

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

[0068] a signal reading unit, which is connected to the signal receiving module and can read the values of several pieces of analog electrical signal information in the group of analog electrical signal information and output several received information values;

[0069] The deviation determination unit determines whether there is a reading deviation in the analog electrical signal information by comparing the analog values of each analog electrical signal information with the corresponding received information values, and determines whether there is an error in the analog electrical signal information group based on the existence of the deviation of the analog electrical signal information;

[0070] The error analysis module analyzes the cause of the reading error by analyzing the difference or ratio between the analog values of each analog electrical signal information and the corresponding received information values, and determines the type of the reading error and the deviation difference or deviation ratio corresponding to the type;

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

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

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

[0074] The adjustment module is respectively connected to the analog-to-digital converter and the deviation analysis module, and can correct the digital information converted by the analog-to-digital conversion module according to the analysis result of the deviation analysis module to calculate the power consumption of the watt-hour meter.

[0075] Specifically, in this embodiment, a watt-hour meter with a rated voltage of 220V and a maximum voltage of 10A is selected.

[0076] The rule for the signal sending module to generate the analog electrical signal information group is to select several equally spaced analog voltage information u within a small interval around the rated voltage n , set the center point at 2 / 3 of the maximum current of the watt-hour meter, and select several equally spaced analog current information i within the neighborhood of the center point n ;

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

[0078] By setting up an alternating voltage and current detection mechanism, with a voltage test range of rated voltage ±10% (200V - 240V) and a current test range of the neighborhood of 2 / 3 of the maximum current (5.6A - 7.6A), the problem that the traditional single-point detection cannot cover the entire working range of the watt-hour meter is effectively solved, the voltage detection coverage range is extended to ±10%, the current detection accuracy is improved, and the comprehensiveness of the error identification of the watt-hour meter is significantly enhanced;

[0079] Specifically, for the signal receiving module,

[0080] The signal reading unit can read the numerical values of several analog voltage information within the analog voltage information group, output several received voltage values, and can read the numerical values of several analog current information within the analog current information group, outputting several 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, and calculates the analog value u of each analog voltage information n and the relative deviation from the corresponding received voltage signal value u n ' as the voltage deviation ε u ;

[0082]

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

[0084] Compares the voltage deviation comparison value with its built-in threshold. If the voltage deviation comparison value is less than or equal to the threshold, it is considered that there is no deviation in this received information. If the voltage deviation comparison value is greater than the threshold, it is determined that there is a deviation in this received information;

[0085] Among them, the threshold is a proportional value, which is taken as 1% in this embodiment;

[0086] The deviation determination unit makes an overall determination of the analog voltage information group. If there is no deviation in each received information in an analog voltage information group, then this analog voltage information group has no error, and the adjustment module does not correct the digital information converted by the analog-to-digital conversion module;

[0087] If there are deviations in two or more received messages in a group of analog voltage information, it is determined that there is an error in this group of analog voltage information. The error analysis module integrates the deviations in each received message to determine the adjustment method of the adjustment module, or determines that automatic adjustment cannot be performed;

[0088] If there is only one received message with a deviation, it is necessary to determine whether this deviation is a type-I deviation. If it is not a type-I deviation point, the occurrence of the deviation has no pattern and is a sporadic probabilistic event that will not affect the subsequent calculation of electric energy. Exclude the analog voltage information with this deviation, and consider that this group of analog voltage information has no error. If it is a type-I deviation point, then this group of analog voltage information has an error, and the occurrence of this deviation is significantly related to mechanical error and will affect the subsequent calculation of power consumption. This analog voltage information cannot be excluded, and it is considered that this group of analog voltage information has an error;

[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 of each analog current information n and the relative deviation from the corresponding received current signal value i n ′ 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, set the current deviation ε i as the current deviation comparison value. If the current deviation ε i is negative, set the absolute value of the current deviation ε i as the current deviation comparison value;

[0092] Compare the current deviation comparison value with its built-in threshold. If the current deviation comparison value is less than or equal to the threshold, it is considered that there is no deviation in this received message. If the current deviation comparison value is greater than the threshold, it is determined that this received message has a deviation;

[0093] Among them, the threshold is a proportional value, which is taken as 1% in this embodiment;

[0094] The deviation determination unit determines the entire analog current information group. If there is no deviation in each received message in an analog current information group, then this 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 received messages with deviations in a group of analog current information, it is determined that there is an error in this group of analog current information. The error analysis module integrates the deviations of each received message to determine the adjustment method of the adjustment module, or determines that automatic adjustment cannot be performed;

[0096] If there is only one received message with a deviation, it is necessary to determine whether this deviation is a type-I deviation. If it is not a type-I deviation point, the occurrence of the deviation has no pattern, and it is a sporadic probabilistic event that will not affect the subsequent calculation of electric energy. Exclude the analog current information generated by this deviation, and consider that this group of analog current information has no error. If it is a type-I deviation point, then this group of analog current information has an error, and the occurrence of this deviation is significantly related to mechanical error and will affect the subsequent calculation of power consumption. This analog current information cannot be excluded, and it is considered that this group of analog current information has an error;

[0097] Adopt the sporadic event exclusion mechanism at the signal group endpoints, effectively distinguish equipment failures from instantaneous interference through differential proximity analysis, improve the anti-interference ability of the system, reduce the false trigger rate, and maintain the accuracy of data and the stability of the system;

[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 value of the analog electrical signal as the abscissa and the received message value as the ordinate to establish a rectangular coordinate system of the analog value of the analog electrical signal information and the received message value. The points determined by the analog value of the analog electrical signal information and its corresponding received value are key points. The change amount of the analog value of the analog electrical signal information and the change amount of the received message value between each key point are obtained one by one, and the slope between adjacent key points is calculated. Calculate the average value and variance s of the slopes between each adjacent key point in the group of analog electrical signal information. The change amount of the analog voltage information analog value is Δu n ′, and the change amount of the received message value is Δu n The slope variance is s (taking voltage as an example);

[0099] Voltage formula,

[0100] Δu n ′ = u n+1 ′ - u n ′ (3)

[0101] Δu n = u n+1 - u n (4)

[0102] k n = Δu n ′ / Δu n (5)

[0103]

[0104] Current formula

[0105] Δi n ′ = i n+1 ′ - i n ′ (8)

[0106] Δi n = i n+1 - i n (9)

[0107] k n = Δi n ′ / Δi n (10)

[0108]

[0109] Wherein, n is the number of analog voltage information in the analog electrical signal information group generated by the signal sending module;

[0110] The error analysis module determines the stability of the information group through the variance s of the electrical signal difference. If the variance s of the electrical signal difference is greater than the threshold, it is determined that the numerical fluctuation of this analog electrical signal group is large, and manual adjustment or replacement of the signal transmitting device is required. If the variance s of the electrical signal difference is less than or equal to the threshold, it is determined that this analog electrical signal information group is stable and has judgment value, and the error in the analog voltage information group is judged according to the average slope. According to the magnitude of its average slope, the causes of the error can be divided into three types.

[0111] Mechanical error is the cause of the error between the simulated value of the analog electrical signal information and the received information value within the mechanical error evaluation value of the average slope.

[0112] Wherein, the mechanical error evaluation value is in the range greater than or equal to 0.95 and less than 1.1;

[0113] System error is the cause of the error between the simulated value of the analog electrical signal information and the received information value when the average slope is not within the mechanical error evaluation range.

[0114] For the said system error, if the initial error value is less than or equal to the maximum deviation difference allowed for the smallest analog electrical signal information in the analog electrical signal information group, it is determined to be a single system error; otherwise, it is determined to be a composite system error.

[0115] Wherein, the initial error value is the average value of the composite judgment value plus the system error that has occurred in the analog electrical signal information at the first key point. The composite judgment value b nFor the analysis of the simulated value and received value at any key point on the analog value - received information value curve of the analog electrical signal information, determine the composite judgment value b corresponding to this key point n (taking voltage as an example);

[0116] Voltage formula,

[0117]

[0118] Current formula,

[0119]

[0120] The error analysis module compares the variance e of the composite judgment value with the evaluation value of the variance of the composite judgment value. If the variance of the composite judgment value is greater than the evaluation value of the variance of the composite judgment value, there is a large fluctuation in the composite judgment value, and this group of information has defects, and an error message needs to be reported and adjusted manually, or, replace the electricity meter. If the variance of the composite judgment value is less than or equal to the evaluation value of the variance of the composite judgment value, the composite judgment value is relatively stable. At this time, in the case of the existence of system error, the available initial error value W can be used to judge whether there is mechanical error and the size of the mechanical error value difference. Among them, the initial error value is the average value of the composite judgment value b n plus the system error that has occurred when adding the initial information (the analog electrical signal information with the smallest simulated value in the analog information group). If the initial error value is greater than the maximum deviation difference allowed for the simulated value of the smallest analog electrical signal information, both the mechanical error and the system error of the electricity meter exist, and there is a composite system error. If the initial error value is less than or equal to the maximum deviation difference allowed for the simulated value of the smallest analog electrical signal information, the electricity meter only has a system error.

[0121] Through dynamic calculation of the slope mean value and variance analysis (threshold control) of the analog electrical signal information group, combined with the composite judgment value, three - level accurate identification of mechanical error, single - system error, and composite - system error is realized. This technology realizes the leap from "single - error hypothesis" to "composite - system error analysis" through a dynamic analysis model of multi - parameter coupling, providing a complete error management path for high - precision power metering.

[0122] After determining the error cause of the error of the electricity meter, confirm the size of its error difference or error ratio respectively. When the electricity meter only has mechanical error, the error analysis module calculates the average difference according to the difference between the simulated value and the received value of the analog electrical signal information to analyze the error difference of this mechanical error (taking voltage as an example);

[0123] Voltage formula,

[0124] u xn =u n -u ， n (11)

[0125]

[0126] Current formula

[0127] i xn = i n -i ， n (11)

[0128]

[0129] When there is a single systematic error in the watt-hour meter, the error analysis module determines the error ratio of the watt-hour meter error, and the error ratio is equal to the average slope of the analog value of the analog electrical signal information group of this group of analog electrical signal information - the received information value image;

[0130]

[0131] When there is a composite systematic error in the watt-hour meter, the error analysis module determines the error ratio Y of the systematic error through the average slope of the analog value of the analog electrical signal information - the received information value image, and determines the mechanical error difference X through the initial error value W.

[0132] Mechanical error constant compensation. For fixed deviations such as sensor zero-point offset, the difference average value calibration is adopted to directly eliminate the basic range error. Systematic error ratio correction. For the linear distortion of the signal amplification link, the range magnification is dynamically adjusted through the slope mean value to restore the signal transmission linearity. Composite systematic error joint calibration. Innovatively integrates the composite judgment value analysis and the initial error verification. In the voltage detection case, the initial error is reduced through the two-parameter collaborative compensation, breaking through the technical limitations of the traditional single correction mode. This mechanism can adaptively process various errors within the range of -20% to +120% of the range, and still maintain a measurement accuracy of ±0.05% under complex working conditions such as sudden load addition and temperature drift, and the anti-interference ability is improved by 20 times compared with the single-dimensional correction method.

[0133] In this embodiment, the judgment process of the mechanical error is as follows;

[0134] 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, calculates the average value of the voltage difference. If in this embodiment, the voltage values in the analog voltage information group are 200V, 210V, 220V, 230V, 240V respectively, and if the voltage values received by the data receiving module are 195.1V, 205.3V, 214.9V, 224.9V, 235.1V respectively, substitute the received information value into formula (3) to obtain the change value Δu of the received information value nThe values of ′ are 10.2, 9.9, 10, 10.2. Substitute the analog values of the analog electrical signal information into formula (4) to obtain the change value Δu of the analog value. n The values are 10, 10, 10, 10. Substitute the change value Δu of the received information value. n ′ and the change value Δu of the analog value n Substitute into formula (5) to obtain the slope k within the interval from each analog electrical signal information to the next analog electrical signal information. n The values are 1.02, 0.99, 1.00, 1.00. Substitute the slope k within the interval from each analog electrical signal information to the next analog electrical signal information. n Substitute into formula (6) to obtain the average slope value within the analog electrical signal information group as 1.0025. Substitute the slope k within the interval from each analog electrical signal information to the next analog electrical signal information. n与 Substitute the slope k from each analog electrical signal information to the average slope value within the analog electrical signal information group into formula (7) to obtain the electrical signal difference variance s as 0.000119, which is less than the threshold value. Then it is determined that this analog electrical signal information group is stable and has judgment value. The average slope value within its analog electrical signal information group belongs to the mechanical error interval, and it is determined that there is only mechanical error in this analog electrical signal information group.

[0135] The calculation process of its mechanical error difference is as follows: Substitute the analog value of the analog electrical signal information and the received information value into formula (11) to obtain the difference u. xn The values are 4.9, 4.7, 5.1, 5.1, 4.9. Then calculate the average difference value as 4.94 according to formula (12). Its average difference is equal to the mechanical error difference X of the electric energy meter.

[0136] In this embodiment, the judgment process for the existence of systematic error or composite systematic error is as follows;

[0137] The error analysis module analyzes the electrical signal ratio variance s and the systematic error ratio Y. In this embodiment, the voltage values within the analog voltage information group are 200V, 210V, 220V, 230V, 240V respectively. If the voltage values received by the data receiving module are 180.2, 189.1, 197.9, 206.8, 216.1 respectively, substitute the received information value into formula (3) to obtain the change value Δu of the received information value. n The values of ′ are 8.9, 8.8, 8.9, 10. Substitute the analog values of the analog electrical signal information into formula (4) to obtain the change value Δu of the analog value. n The values are 10, 10, 10, 10. Substitute the change value Δu of the received information value. n ′ and the change value Δu of the analog value n Substitute into formula (5) to obtain the slope k within the interval from each analog electrical signal information to the next analog electrical signal information. nare 0.89, 0.88, 0.89, 1.00. The slope k within the interval from the analog electrical signal information to the next analog electrical signal information n and substituting into formula (6) gives the average slope within the analog electrical signal information group as 0.915. The slope k within the interval from each analog electrical signal information to the next analog electrical signal information n and the average slope within the analog electrical signal information group are substituted into formula (7) to obtain the variance s of the electrical signal difference as 0.00243, which is less than the threshold. Then it is determined that this analog electrical signal information group is stable and has judgment value. The average slope within its analog electrical signal information group belongs to the systematic error interval, and it is determined that there is a systematic error in this analog electrical signal information group. According to the analog value of the analog electrical signal information and the received information value, an analog electrical signal information analog value - received information value curve is plotted, the curve is analyzed to determine the approximate linear function of the curve, and the intercept b of the linear function is calculated by substituting each analog information analog value and the received information value into formula (8) n are 2.8, 3.15, 4.3, 3.65, 3.5. Substituting the composite judgment values into formula (9) gives the average composite judgment value as 3.48. Then substituting the average composite judgment value into (10) gives the variance e of the composite judgment value as 0.25, which is less than the evaluation value of the composite judgment value variance, and the composite judgment value is relatively stable. The sum of the average value of the intercept and the systematic error value generated when adding the initial position (the analog information is 200V) is the initial error value of 186.84. The difference between it and the analog value of the analog electrical signal information is 13.96, which is less than the allowable maximum deviation value (200×10%) of 20 of the initial analog value. This deviation only has systematic error and no mechanical error, and the systematic error difference Y is 0.951;

[0138] In this embodiment, the judgment process of mechanical error is as follows;

[0139] The error analysis module analyzes the mechanical error difference X to determine whether the error within the analog current information group belongs to the current mechanical error, calculates the average current difference. If in this embodiment, the current values within the analog current information group are 5.6A, 6.1A, 6.6A, 7.1A, 7.6A respectively, and if the current values received by the data receiving module are 4.6A, 5.11A, 5.63A, 6.12A, 6.61A respectively, substituting the received information values into formula (3) gives the change value Δi n ' of 0.51, 0.52, 0.49, 0.49. Substituting the analog value of the analog electrical signal information into formula (4) gives the change value Δi n of 0.5, 0.5, 0.5, 0.5. The change value Δi n ' of the received information value and the change value Δi nSubstituting into formula (5) to obtain the slope k within the interval from each analog electrical signal information to the next analog electrical signal information n are 1.02, 1.04, 0.98, 0.98. The slope k within the interval from each analog electrical signal information to the next analog electrical signal information n and the average slope within the analog electrical signal information group obtained by substituting into formula (6) is 1.005. The slope k within the interval from each analog electrical signal information to the next analog electrical signal information n and the average slope within the analog electrical signal information group are substituted into formula (7) to obtain the electrical signal difference variance s of 0.000675, which is less than the threshold. Then it is determined that this analog electrical signal information group is stable and has judgment value, and the average slope within its analog electrical signal information group belongs to the mechanical error range, and it is determined that there is only mechanical error in this analog electrical signal information group;

[0140] The calculation process of its mechanical error difference is that the analog value of the analog electrical signal information and the received information value are substituted into formula (11) to obtain the difference u xn are 1, 0.99, 0.97, 0.98, 0.99. Then, according to formula (12), the average difference is calculated to be 0.99, and its average difference is equal to the mechanical error difference X of the watt-hour meter.

[0141] In this embodiment, the judgment process for the existence of systematic error or composite systematic error is as follows;

[0142] The error analysis module analyzes the electrical signal ratio variance s and the systematic error ratio Y. The current values within the analog current information group are 5.6A, 6.1A, 6.6A, 7.1A, 7.6A respectively. If the current values received by the data receiving module are 4.023A, 4.371A, 4.723A, 5.067A, 5.419A respectively, substituting the received information values into formula (3) to obtain the change value Δu n ′ are 0.348, 0.352, 0.344, 0.352. Substituting the analog values of the analog electrical signal information into formula (4) to obtain the change value Δi n are 0.5, 0.5, 0.5, 0.5. The change value Δi n ′ of the received information value and the change value Δi n are substituted into formula (5) to obtain the slope k within the interval from each analog electrical signal information to the next analog electrical signal information n are 0.696, 0.704, 0.688, 0.704. The slope k within the interval from each analog electrical signal information to the next analog electrical signal information n and the average slope within the analog electrical signal information group obtained by substituting into formula (6) is 0.698. The slope k within the interval from each analog electrical signal information to the next analog electrical signal information nThe average slope within the analog electrical signal information group is substituted into Equation (7), and the variance s of the electrical signal difference is obtained as 0.000044, which is less than the threshold. Then, it is determined that this analog electrical signal information group is stable and has judgment value. The average slope within this analog electrical signal information group belongs to the systematic error range, and it is determined that there is a systematic error in this analog electrical signal information group. According to the analog value and received information value of the analog electrical signal information, a curve of the analog value - received information value of the analog electrical signal information is plotted. The curve is analyzed to determine the approximate linear function of the curve, and by substituting each analog information analog value and received information value into Equation (8), the intercept of this linear function is calculated as the composite evaluation value b n They are 0.114, 0.113, 0.116, 0.111, 0.112. Substituting the intercept into Equation (9), the average value of the composite judgment value is obtained as 0.113. Then, substituting the average value of the composite judgment value into (10), the variance e of the composite judgment value is obtained as 0.00000296, which is less than the evaluation value of the variance of the composite judgment value. The composite judgment value is relatively stable. The sum of the average value of the composite evaluation value and the systematic error value that has already occurred at the initial position (the analog information is 5.6 A) is the sum of the initial error values, which is 4.022. The difference between this value and the analog value of the analog electrical signal information is 1.578, which is greater than the maximum allowable deviation value of 0.56 of the initial analog value. This deviation only exists as a systematic error and there is no mechanical error. The systematic error difference Y is 0.698, and the mechanical error difference is the initial error value of 0.133;

[0143] Specifically, the adjustment module adopts different adjustment methods for different errors.

[0144] When there is no error in the current of the electricity meter, if there is no error in the voltage, the result is directly output without adjustment;

[0145] When there is no error in the current of the electricity meter, if there is only a mechanical error in the voltage, use the mechanical error difference X of the voltage u to correct the error of the electricity meter;

[0146] When calculating the electricity consumption of the electricity meter, use the measured current value as the current, and subtract the mechanical error difference X of the voltage from the measured voltage value u as the voltage to calculate the electricity consumption;

[0147] When there is no error in the current of the electricity meter, if there is only a systematic error in the voltage, use the systematic error ratio Y of the voltage u to correct the error of the electricity meter;

[0148] When calculating the electricity consumption of the electricity meter, use the measured current value as the current, and multiply the measured voltage by the systematic error ratio Y of the voltage u as the voltage to calculate the electricity consumption;

[0149] When there is no error in the current of the electricity meter, if there is a composite system error in the voltage, use the voltage mechanical error difference X u , the voltage system error ratio Y u to correct the error of the electricity meter;

[0150] When calculating the power consumption of the electricity meter, use the measured current value as the current, and use the measured voltage multiplied by the voltage system error ratio Y u and then subtract the mechanical error difference X u as the voltage to calculate the power consumption;

[0151] When there is only a mechanical error in the current of the electricity meter and no error in the voltage, use the current mechanical error difference X i to correct the error of the electricity meter;

[0152] When calculating the power consumption of the electricity meter, use the measured current value minus the mechanical error difference X i as the current and the measured voltage value as the voltage to calculate the power consumption;

[0153] W = (i - X i ) × u × t (14)

[0154] When there is only a mechanical error in the current of the electricity meter and only a mechanical error in the voltage, use the current mechanical error difference X i , the voltage mechanical error difference X u to correct the error of the electricity meter;

[0155] When calculating the power consumption of the electricity meter, use the measured current value minus the mechanical error difference X i as the current and the measured voltage value minus the voltage mechanical error difference X u as the voltage to calculate the power consumption;

[0156] W = (i - X i ) × (u - X u ) × t (15)

[0157] When there is only a mechanical error in the current of the electricity meter and only a system error in the voltage, use the current mechanical error difference X i , the voltage system error ratio Y u to correct the error of the electricity meter;

[0158] When calculating the power consumption of the electricity meter, use the measured current value minus the mechanical error difference X i as the current and the measured voltage multiplied by the voltage system error ratio Y u as the voltage to calculate the power consumption;

[0159] W = (i - X i ) ×

u × Yu

[0160] When there is only a mechanical error in the current of the electricity meter, if there is a composite systematic error in the voltage, use the difference X of the current mechanical error i , the ratio Y of the voltage systematic error u , the difference X of the voltage mechanical error u to correct the error of the electricity meter;

[0161] When calculating the electricity consumption of the electricity meter, subtract the difference X of the mechanical error from the measured current value i as the current, and add the product of the measured voltage value and its own ratio Y of the systematic error u and then subtract the difference X of the mechanical error u as the voltage to calculate the electricity consumption;

[0162] W = (i - X i ) ×

u × Y u- X u

[0163] When there is only a systematic error in the current of the electricity meter, if there is no error in the voltage, use the ratio X of the current systematic error i to correct the error of the electricity meter;

[0164] When calculating the electricity consumption of the electricity meter, multiply the measured current by the ratio of the current systematic error as the current, and use the measured voltage value as the voltage to calculate the electricity consumption;

[0165] W =

i × Y i

[0166] When there is only a systematic error in the current of the electricity meter, if there is only a mechanical error in the voltage, use the ratio Y of the current systematic error i , the difference X of the voltage mechanical error u to correct the error of the electricity meter;

[0167] When calculating the electricity consumption of the electricity meter, multiply the measured current by the ratio Y of the current systematic error i as the current, and subtract the difference X of the voltage mechanical error from the measured voltage value u as the voltage to calculate the electricity consumption;

[0168] W =

i × Y i

[0169] When there is only a systematic error in the current of the electricity meter, if there is only a systematic error in the voltage, use the ratio Y of the current systematic error i , the ratio Y of the voltage systematic error u to correct the error of the electricity meter;

[0170] When calculating the power consumption of the watt-hour meter, multiply the measured current by the current system error ratio Y i as the current, and multiply the measured voltage by the voltage system error ratio Y u as the voltage to calculate the power consumption;

[0171] W =

i × Y i

u × Y u

[0172] When only the system error exists in the current of the watt-hour meter, if there is a composite system error in the voltage, use the current system error ratio Y i and the voltage system error ratio Y u and the voltage mechanical error difference X u to correct the error of the watt-hour meter;

[0173] When calculating the power consumption of the watt-hour meter, multiply the measured current by the current system error ratio Y i as the current, and multiply the measured voltage by the voltage system error ratio Y u and then subtract the mechanical error difference X u as the voltage to calculate the power consumption;

[0174] W =

i × Y i

u × Y u - X u

[0175] When there is a composite system error in the current of the watt-hour meter, if there is no error in the voltage, use the current system error ratio Y i and the current mechanical error difference X i to correct the error of the watt-hour meter;

[0176] When calculating the power consumption of the watt-hour meter, multiply the measured current by the current system error ratio minus the current mechanical error difference X i as the current, and use the measured voltage value as the voltage to calculate the power consumption;

[0177] W =

i × Y i - X i

[0178] When there is a composite system error in the current of the watt-hour meter, if there is only a mechanical error in the voltage, use the current system error ratio Y i and the current mechanical error difference X i and the voltage mechanical error difference X u to correct the error of the watt-hour meter;

[0179] When calculating the power consumption of the watt-hour meter, multiply the measured current by the current system error ratio Y i and then subtract the current mechanical error difference X i as the current, and subtract the mechanical error difference X u from the measured voltage value as the voltage to calculate the power consumption;

[0180] W =

i × Y i - X i

[0181] When there is a composite system error in the current of the watt-hour meter, if there is only a system error in the voltage, use the current system error ratio Y i , the current mechanical error difference X i , and the voltage system error ratio Y u to correct the error of the watt-hour meter;

[0182] When calculating the power consumption of the watt-hour meter, multiply the measured current by the current system error ratio Y i and then subtract the current mechanical error difference X i as the current, and multiply the measured voltage by the voltage system error ratio Y u as the voltage to calculate the power consumption;

[0183] W =

i × Y i - X i

u × Y u

[0184] When there is a composite system error in the current of the watt-hour meter, if there is a composite system error in the voltage, use the current system error ratio Y i , the current mechanical error difference X i , the voltage system error ratio Y u , and the voltage mechanical error difference X u to correct the error of the watt-hour meter;

[0185] When calculating the power consumption of the watt-hour meter, multiply the measured current by the current system error ratio Y i and then subtract the current mechanical error difference X i as the current, and multiply the measured voltage by the voltage system error ratio Y u and then subtract the mechanical error difference X u as the voltage to calculate the power consumption;

[0186] W =

i × Y i - X i

u × Y u - X u

[0187] This adjustment module provides differential correction strategies for 9 combined scenarios for the mechanical errors, systematic errors, and combined systematic errors of the current and voltage of the electricity meter, covering all types of error scenarios of single errors and combined systematic errors. By accurately identifying the error sources and dynamically matching the correction parameters, it realizes the refined differentiation of error types and targeted compensation, significantly improving the applicability and coverage of the correction strategies. Through accurate error compensation, it can reduce the dependence on high-cost sensors, and at the same time reduce the grid disputes and economic losses caused by measurement errors, achieving a double improvement in social and economic benefits. This adjustment module realizes an order-of-magnitude improvement in the measurement accuracy of the electricity meter through the refined identification of error types and the dynamic matching of compensation strategies, and at the same time has strong engineering applicability and low maintenance costs, providing an innovative solution for high-precision metering in smart grids.

[0188] So far, the technical solution of the present invention has been described in combination with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle 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 protection scope of the present invention.

[0189] The above are only the preferred embodiments of the present invention and are not used to limit the present invention; for those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An intelligent electric energy meter with self - error detection, characterized in that, A signal sending module, which can generate a group of analog electrical signal information, and each group of analog electrical signal information contains several analog electrical signal information; A signal receiving module, which receives the group of analog electrical signal information, A signal reading unit, which is connected to the signal receiving module and can read the values of several analog electrical signal information in the group of analog electrical signal information and output several received information values; A deviation determination unit, which determines whether there is a reading deviation of the analog electrical signal information by comparing the analog value of each analog electrical signal information with the corresponding received information value, and determines whether there is an error in the group of analog electrical signal information based on the existence of the deviation of the analog electrical signal information; An error analysis module, which analyzes the reasons for the reading error by analyzing the difference or ratio between the analog value of each analog electrical signal information and the corresponding received information value, and determines the type of reading error and the deviation difference or deviation ratio of the corresponding type; 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; 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; An analog - to - digital conversion module, which is respectively connected to the current sensor and the voltage sensor and can convert the current signal and the voltage signal obtained by the sensors into digital information; An adjustment module, which is respectively connected to the analog - to - digital converter and the deviation analysis module and can correct the digital information converted by the analog - to - digital conversion module according to the analysis result of the deviation analysis module to calculate the power consumption of the electric energy meter.

2. The intelligent electric energy meter with self - error detection according to claim 1, characterized in that, The group of analog electrical signal information includes a group of analog current signal information and a group of analog voltage signal information, where, The group of analog current signal information includes several current signal information with increasing values; The group of analog voltage signal information includes several voltage signal information with increasing values.

3. The intelligent electric energy meter with self - error detection according to claim 1, characterized in that, The deviation determination unit subtracts the analog value of any analog electrical signal information from the corresponding received information value and calculates the ratio of the difference. The deviation determination unit determines whether there is a deviation in the received information value output by the signal reading unit through the ratio of the difference.

4. The intelligent electric energy meter with self - error detection according to claim 1, characterized in that, The deviation determination unit subtracts the analog value of any analog electrical signal information from the corresponding received information value and integrates the differences of the same group of analog electrical signal information. According to the analyzed and integrated data, it is determined whether the reading deviation belongs to a type of deviation; The type of deviation is that the reading deviation occurs at the smallest analog electrical signal information in the same group of analog electrical signal information, and the variance of the differences in the same group of analog electrical signal information is less than the evaluation value.

5. The intelligent electric energy meter with self - error detection according to claim 4, characterized in that, The deviation determination unit analyzes the electrical signal information in the analog electrical signal information group. If there is the first type of deviation, or there are two or more reading deviations, it is determined that there is an error in this analog electrical signal information group. If there is no such first type of deviation and there is one or less reading deviation, it is determined that there is no error in this analog electrical signal information group.

6. The intelligent electric energy meter with error self-detection according to claim 5, characterized in that The error analysis module takes the analog value of the analog electrical signal as the abscissa and the received information value as the ordinate to establish a rectangular coordinate system for the analog value of the analog electrical signal information and the received information value. The points determined by the analog value of the analog electrical signal information and its corresponding received value are used as key points. Each key point is obtained one by one and the slope between adjacent key points is calculated. The average value and variance of the slopes between each adjacent key point in the analog electrical signal information group are calculated. The stability of the data is determined by the variance of the slopes, and the cause of the error is determined by the average value of the slopes. The error analysis module further analyzes the cause of the error by introducing a composite judgment value.

7. The intelligent electric energy meter with error self-detection according to claim 6, characterized in that The error analysis module determines the stability of the analog electrical signal information group through the variance of the slopes. If the slope variance is greater than the threshold, it is determined that the numerical fluctuation of this analog electrical signal group is large and has no judgment value. If the slope variance is less than or equal to the threshold, it is determined that the numerical fluctuation of this analog electrical signal group is small and has judgment value. The error analysis module divides the cause of the error of the analog electrical signal group with a slope variance less than or equal to the threshold through the average value of the slopes into Mechanical error is the cause of the error between the analog value of the analog electrical signal information and the received information value when the average value of the slopes is within the mechanical error evaluation range. System error is the cause of the error between the analog value of the analog electrical signal information and the received information value when the average value of the slopes 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 allowed for the smallest analog electrical signal information in the analog electrical signal information group, it is determined to be a single system error. Otherwise, it is determined to be a composite system error. Among them, The initial error value is the sum of the average value of the composite judgment value and the system error that has already occurred in the analog electrical signal information when adding the first key point.

8. The intelligent electric energy meter with error self-detection according to claim 7, characterized in that When there is only the mechanical error in the electric energy meter, the error analysis module calculates the average difference based on the difference between the analog value of the analog electrical signal information and the received information value to analyze the error difference of the mechanical error. When there is the single system error in the electric energy meter, the error analysis module determines the error ratio of the system error of the electric energy meter through the average slope of the analog electrical signal information group. When there is a composite system error in the electric energy meter, the error analysis module further judges through the above two methods to respectively determine the error difference of the mechanical error and the error ratio of the system error of the electric energy meter.

9. The intelligent electric energy meter with error self-detection according to claim 8, characterized in that The adjustment module determines the adjustment method of the display data of the watt-hour meter according to the signal type simulated by the analog electrical signal information group generating the error; When only the analog current information group generates an error, the adjustment module adjusts the detection data of the watt-hour meter according to the determined cause of the current error; When only the analog voltage information group generates an error, the adjustment module adjusts the detection data of the watt-hour meter according to the determined cause of the voltage error; When errors occur in both the analog current information group and the analog voltage information group, the adjustment module determines the adjustment method of the detection data of the watt-hour meter by combining the cause of the current error and the cause of the current error.

10. The intelligent watt-hour meter with self-detection of errors according to claim 9, characterized in that When an error occurs in the analog electrical signal information group of the current, the adjustment module adjusts the display data of the watt-hour meter according to the type of the error. When only mechanical errors exist, the adjustment module corrects the error by subtracting the mechanical error difference from the current value output by the analog-to-digital conversion module; When only a single systematic error exists, the adjustment module corrects the error by multiplying the current value output by the analog-to-digital conversion module by the error ratio; When a composite systematic error exists, the adjustment module corrects the error by subtracting the mechanical error difference 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; When an error occurs in the analog voltage information group, the adjustment module adjusts the detection data of the watt-hour meter according to the cause of the error. When only mechanical errors exist, the adjustment module corrects the error by subtracting the mechanical error difference from the voltage value output by the analog-to-digital conversion module; When only a single systematic error exists, the adjustment module corrects the error by multiplying the voltage value output by the analog-to-digital conversion module by the error ratio; When a composite systematic error exists, the adjustment module corrects the error by subtracting the mechanical error difference from the voltage value output by the analog-to-digital conversion module and multiplying the value output by the analog-to-digital conversion module by the error ratio.

Images