CN-122017308-A - Dual temperature compensation method and device for electric energy meter of temperature sensor

CN122017308ACN 122017308 ACN122017308 ACN 122017308ACN-122017308-A

Abstract

The invention discloses a dual temperature compensation method and a device for an electric energy meter of a temperature sensor, which relate to the technical field of measurement precision compensation of the electric energy meter, and the method comprises the steps of acquiring real time temperature by a built-in measurement chip of the electric energy meter and a temperature acquisition function, calculating ambient temperature by combining a thermodynamic principle and an experimental fitting relation, estimating real time temperature of a manganese-copper sampling resistor according to the ambient temperature, a pre-stored manganese-copper temperature curve and a three-node thermal network model, calling a dual temperature compensation model to calculate a compensation coefficient, carrying out cooperative correction on temperature offset of the two, and outputting a measurement result; according to the invention, the temperature acquisition module is arranged on the metering chip, a hardware temperature sensor is not required to be additionally arranged, the equipment cost is reduced, the real-time temperature of the manganese-copper sampling resistor is accurately estimated by calculating the ambient temperature and combining the manganese-copper temperature curve and the thermal network model, the dual cooperative compensation of the temperature drift of the manganese-copper sampling resistor and the temperature drift of the metering chip is realized, and the problem of insufficient compensation precision of a single heat source is solved.

Inventors

ZHANG XIAODONG
WEI XIANGLONG
HUANG YUHAO
XU YUANYUAN
CHEN WENZAO
ZHU GUOFU
ZHAO SHUAI

Assignees

江阴长仪集团有限公司

Dates

Publication Date: 20260512
Application Date: 20260203

Claims (10)

1. The electric energy meter double temperature compensation method of the temperature sensor is characterized by comprising the following steps of: S1, acquiring real-time temperature of a metering chip through a temperature acquisition function of the metering chip built in the electric energy meter; S2, based on the real-time temperature of the metering chip, establishing an association relation by combining a thermodynamic principle, and calculating the working environment temperature of the electric energy meter; S3, estimating the real-time temperature of the manganese-copper sampling resistor through a three-node thermal network model of the manganese-copper environment of the metering chip according to the environment temperature and a pre-stored manganese-copper temperature curve; S4, calling a dual temperature compensation model, inputting the real-time temperature of the metering chip and the real-time temperature of the manganese-copper sampling resistor to calculate a compensation coefficient, and carrying out cooperative correction on the real-time temperature deviation of the manganese-copper sampling resistor and the real-time temperature deviation of the metering chip by using the compensation coefficient to output a metering result.
2. The method for dual temperature compensation of a temperature sensor according to claim 1, wherein the calculation of the environmental temperature in S2 is performed according to the following procedure: developing a plurality of groups of control experiments, covering the conventional working temperature interval of the electric energy meter, and synchronously recording the experimental environment temperature and the temperature data of the metering chip in a corresponding state; Based on recorded experimental data, constructing a functional relation between the temperature of the metering chip and the ambient temperature through data fitting; substituting the real-time temperature of the metering chip obtained in the step S1 into the functional relation, and calculating to obtain the working environment temperature of the electric energy meter.
3. The method for dual temperature compensation of an electric energy meter of a temperature sensor according to claim 2, wherein the real-time temperature estimation of the manganese-copper sampling resistor in S3 comprises the following steps: calling pre-stored three-node thermal network model parameters, wherein the parameters comprise a heat conduction coefficient and a heat radiation coefficient between a metering chip and manganese copper, between manganese copper and environment and between the metering chip and environment; determining a load interval to which the current load of the electric energy meter belongs according to the current load of the electric energy meter, and selecting a corresponding preset thermal time constant; And (3) substituting the environment temperature calculated in the step (S2), a pre-stored manganese-copper temperature curve and a selected thermal time constant into a three-node thermal network model to finish the real-time temperature estimation of the manganese-copper sampling resistor.
4. The method for double temperature compensation of an electric energy meter of a temperature sensor according to claim 1, wherein the calculation of the compensation coefficient in S4 is performed by the following steps: inquiring a preset metering chip temperature deviation correction coefficient table according to the real-time temperature of the metering chip to obtain a metering chip side correction coefficient; according to the real-time temperature of the manganese-copper sampling resistor, a pre-stored manganese-copper temperature curve is combined, and a manganese-copper side correction coefficient is calculated; and carrying out weighted summation on the correction coefficient of the metering chip side and the correction coefficient of the manganese copper side according to a preset proportion to obtain a final compensation coefficient.
5. The method for compensating the double temperatures of the electric energy meter of the temperature sensor according to claim 1, wherein the temperature acquisition in the step S1 is completed through a temperature acquisition unit of a metering chip, the acquisition object is the temperature of an inner core area of the metering chip, the acquisition interval is dynamically adjusted according to the current load of the electric energy meter, short-interval acquisition is adopted when the current load exceeds a set threshold, and long-interval acquisition is adopted when the current load does not exceed the set threshold.
6. The method for compensating double temperatures of an electric energy meter of a temperature sensor according to claim 1, wherein the pre-stored temperature curve of manganese copper in the step S3 is obtained through a special test, the test covers an extreme temperature range which may occur in the working environment of the electric energy meter, actual resistance values of manganese copper sampling resistors are measured at different temperature nodes, temperature data and corresponding resistance values are associated to form a continuous temperature resistance relation curve, and the continuous temperature resistance relation curve is stored in a built-in storage unit of the electric energy meter.
7. The method for compensating the double temperature of the electric energy meter of the temperature sensor according to claim 1, wherein the weight parameters of the double temperature compensation model in the step S4 are determined through calibration experiments, the calibration experiments are carried out in batches under different temperature environments and different load conditions, metering error data under each experimental scene are recorded, and the weight parameters are obtained based on reverse iterative optimization of error correction effects and are preset in the model.
8. The method for dual temperature compensation of electric energy meter of temperature sensor according to claim 1, wherein the original metering data adopted in the collaborative correction in the step S4 comprises an instantaneous voltage sampling value output by a voltage sampling module and an instantaneous current sampling value output by a current sampling module, and the compensation coefficient is respectively calculated with the instantaneous voltage sampling value and the instantaneous current sampling value to obtain corrected voltage data and current data, and the electric energy metering calculation is completed based on the corrected data.
9. The electric energy meter double temperature compensation device of the temperature sensor is suitable for the electric energy meter double temperature compensation method of the temperature sensor according to any one of claims 1-8, and is characterized in that the device comprises an electric energy meter body, wherein a metering chip module, an environment temperature calculating unit, a manganese copper temperature estimating unit, a double compensation calculating unit and a metering correcting unit are integrated in the electric energy meter body; The metering chip module is electrically connected with the ambient temperature estimation unit, the ambient temperature estimation unit is electrically connected with the manganese copper temperature estimation unit, the double compensation calculation unit is respectively electrically connected with the metering chip module and the manganese copper temperature estimation unit, and the metering correction unit is electrically connected with the double compensation calculation unit; The metering chip module collects real-time temperature of the metering chip module, the environment temperature calculating unit calculates the environment temperature based on the temperature of the metering chip, the manganese copper temperature estimating unit outputs real-time temperature of a manganese copper sampling resistor, the dual compensation calculating unit generates a compensation coefficient, and the metering correction unit corrects original metering data.
10. The electric energy meter double temperature compensation device of the temperature sensor according to claim 9, wherein the manganese copper temperature estimation unit comprises a built-in storage module, a manganese copper temperature curve, a heat conduction coefficient and a heat radiation coefficient of a three-node heat network model and heat time constants corresponding to different current load intervals are prestored in the storage module, the heat conduction coefficient and the heat radiation coefficient are obtained through calibration of a plurality of groups of temperature gradient experiments, the heat time constants are divided according to the current load intervals and are correspondingly stored, and after the manganese copper temperature estimation unit receives an environmental temperature signal, parameters corresponding to the current load are matched and substituted into the model to complete temperature estimation.

Description

Dual temperature compensation method and device for electric energy meter of temperature sensor Technical Field The invention relates to the technical field of electric energy meter measurement precision compensation, in particular to an electric energy meter dual temperature compensation method and device of a temperature sensor. Background The temperature sensor is a device or apparatus capable of sensing temperature physical quantity and converting the temperature physical quantity into an output electric signal, and has the core significance of providing a direct basis for temperature monitoring of various electronic equipment, is a basic component for realizing self-adaptive adjustment and precision calibration of equipment temperature, is widely applied to the fields of industrial control, electronic metering and the like, and ensures stable operation of the equipment in complex temperature environments. The electric energy meter is used as core equipment for measuring electric energy consumption in an electric power system, benefits are distributed between a power supply enterprise and an electricity user, accuracy and stability of measuring accuracy are of great practical significance, in the actual working process of the electric energy meter, temperature change is one of key factors influencing the measuring accuracy, a manganese copper sampling resistor in the electric energy meter can self-heat due to current passing, meanwhile, the electric energy meter is influenced by external environment temperature, a resistance value is caused to drift, elements such as a measuring chip and a peripheral capacitor can rise abnormally due to temperature generated by heat conduction and heat radiation, self-performance offset is caused, and the measuring error of the electric energy meter can be caused by the combined action of the measuring chip and the peripheral capacitor. Therefore, the temperature compensation technology of the electric energy meter is a core means for counteracting temperature interference and guaranteeing metering accuracy, and is important for improving the reliability and metering fairness of the electric energy meter. However, the existing electric energy meter temperature compensation technology still has certain defects, part of schemes rely on pure software algorithms, compensation is carried out based on thermodynamic models or empirical formulas, direct temperature detection is carried out without combining a temperature sensor, compensation accuracy is limited by model fitting degree or empirical data, part of schemes adopt temperature sensing technology, but hardware temperature sensors are additionally arranged, equipment cost and installation complexity are increased, part of schemes only compensate for a single heat source, double influences of temperature drift of a metering chip and temperature drift of a manganese copper resistor are not considered, complex thermal environment is difficult to adapt, and the schemes reduce self-heating influence by improving a material heat treatment process, dynamic compensation cannot be achieved, and therefore, the electric energy meter double temperature compensation method and device for the temperature sensor are developed and have important significance. Disclosure of Invention The invention aims to make up the defects of the prior art, and provides a dual temperature compensation method and device for an electric energy meter of a temperature sensor, which can utilize a temperature acquisition module of a metering chip without additionally adding a hardware temperature sensor, reduce equipment cost and simplify an installation structure, and realize dual cooperative compensation for temperature drift of the manganese copper sampling resistor and temperature drift of the metering chip by calculating the ambient temperature and combining a manganese copper temperature curve and a thermal network model, and effectively improve metering accuracy and long-term stability of the electric energy meter by means of a dynamic thermal network model and a dual compensation algorithm. The invention provides a dual temperature compensation method of an electric energy meter of a temperature sensor, which aims to solve the technical problems and comprises the following steps: S1, acquiring real-time temperature of a metering chip through a temperature acquisition function of the metering chip built in the electric energy meter; S2, based on the real-time temperature of the metering chip, establishing an association relation by combining a thermodynamic principle, and calculating the working environment temperature of the electric energy meter; S3, estimating the real-time temperature of the manganese-copper sampling resistor through a three-node thermal network model of the manganese-copper environment of the metering chip according to the environment temperature and a pre-stored manganese-copper temperature curve; S4, calling a dual temperature