CN-122017309-A - Electric energy meter metering error compensation method based on quick response of non-uniform temperature field

CN122017309ACN 122017309 ACN122017309 ACN 122017309ACN-122017309-A

Abstract

The invention relates to the field of power systems, in particular to an electric energy meter metering error compensation method based on quick response of an uneven temperature field. The method comprises the steps of obtaining the internal environment temperature, the current value of a current divider load and the resistance value of the current divider of the electric energy meter to be compensated, obtaining a current change trend according to the current value of the current divider load, constructing a resistance correction model according to the internal environment temperature, the current value of the current divider load and the current change trend, correcting the resistance value of the current divider by using the resistance correction model to obtain a target current divider resistance value, and compensating the metering error of the electric energy meter based on the target current divider resistance value. In this way, the metering accuracy and the metering data reliability of the electric energy meter under the temperature change condition and the metering error compensation speed can be improved.

Inventors

ZHOU YIZHAO
ZHU YONGFENG
CHU HUAKANG
Fang Xiaolun
WANG WEIRAN
LIU HANWEN

Assignees

杭州西力智能科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260407

Claims (10)

1. The utility model provides an electric energy meter metering error compensation method based on inhomogeneous temperature field quick response which characterized in that includes: Obtaining the internal environment temperature, the current value of the current divider load and the resistance value of the current divider of the electric energy meter to be compensated; the method comprises the steps of constructing a resistance correction model according to the internal environment temperature, a current value of a shunt load and a current change trend, correcting the resistance value of the shunt by using the resistance correction model, and obtaining a target resistance value of the shunt; and compensating the metering error of the electric energy meter to be compensated based on the target shunt resistance value.
2. The method of claim 1, wherein constructing a resistance correction model based on the internal ambient temperature, the shunt load current value, and the current trend comprises: When the current change trend is rising or unchanged, presetting a temperature step length, and obtaining a rising data set according to the internal environment temperature, the current value of the shunt load and the temperature step length; when the current change trend is descending, presetting a time sampling point, obtaining a descending data set according to the internal environment temperature, the current value of the shunt load and the time sampling point, constructing a descending resistance correction model based on the descending data set, and taking the descending resistance correction model as a final resistance correction model.
3. The method of claim 2, wherein the deriving the rise data set from the internal ambient temperature, the shunt load current value, and the temperature step comprises: setting an upward temperature rise sampling point according to the minimum temperature and the temperature step length by taking the internal environment temperature as the minimum temperature; setting an ascending current sampling point according to the current value of the shunt load; After the internal temperature of the electric energy meter to be compensated reaches each rising temperature sampling point, acquiring the resistance value of the shunt according to the rising current sampling points to obtain a rising shunt resistance value set of each rising temperature sampling point; Constructing an ascending sampling data set of each ascending temperature sampling point according to the temperature value of each ascending temperature sampling point, an ascending shunt resistance value set of each ascending temperature sampling point and an ascending current sampling point, wherein each piece of data of the ascending sampling data set comprises an ascending shunt resistance value, an ascending temperature value and an ascending current value, the ascending temperature value is a value of the ascending temperature sampling point when the ascending shunt resistance value is acquired, and the ascending current value is a value of the ascending current sampling point when the ascending shunt resistance value is acquired; And taking the up-sampling data set of all up-temperature sampling points as an up-sampling data set.
4. A method according to claim 3, wherein said acquiring shunt resistance values from said up-current sampling points comprises: loading the current of the current divider load, and collecting the resistance value of the current divider after the current divider load reaches each ascending current sampling point to obtain the resistance value of the current divider of each ascending current sampling point; And taking the set of shunt resistance values of all rising current sampling points as the set of rising shunt resistance values of corresponding temperature points.
5. A method according to claim 3, wherein constructing a rising resistance correction model based on the rising dataset comprises: fitting the data in the ascending data set by adopting a two-dimensional polynomial to obtain a current ascending model; Calculating a correction coefficient of the current rising model by a least square method; and constructing a rising resistance correction model based on the correction coefficient of the current rising model.
6. The method of claim 2, wherein deriving the drop data set from the internal ambient temperature, the shunt load current value, and the time sampling point comprises: Setting a temperature-decreasing sampling point according to the minimum temperature and the temperature step length by taking the internal environment temperature as the minimum temperature; setting a down current sampling point according to the shunt load current value; After the internal temperature of the electric energy meter to be compensated reaches each down-temperature sampling point, acquiring the resistance value of the shunt according to the down-current sampling points and the time sampling points to obtain the resistance value of the down-shunt of each down-temperature sampling point; Constructing a down sampling data set of each down temperature sampling point according to the temperature value of each down temperature sampling point, a down shunt resistance value set of each down temperature sampling point, a down current sampling point and a time sampling point, wherein each piece of data of the down sampling data set comprises a down shunt resistance value, a down temperature value, a down current value and a time value, the down temperature value is a value of the down temperature sampling point when the down shunt resistance value is acquired, the down current value is a value of the down current sampling point when the down shunt resistance value is acquired, and the time value is a value of the time sampling point when the down shunt resistance value is acquired; and taking the downsampled data set of all downsampled downsampling points as a downsampled data set.
7. The method of claim 6, wherein said acquiring shunt resistance values from said down-current sample point and time sample point comprises: presetting a current maximum value of a shunt, and adjusting the current of the shunt to reach the current maximum value of the shunt; The current value of the current divider is reduced to each descending current sampling point in sequence, and then the resistance value of the current divider is acquired according to the time sampling points, so that the resistance value of the current divider of each descending current sampling point is obtained; And taking the set of the shunt resistance values of all the falling current sampling points as the falling shunt resistance value of the corresponding temperature point.
8. The method of claim 7, wherein the acquiring shunt resistance values from time sampling points comprises: the current value of the current divider is kept at the time of the corresponding descending current sampling point, and when the time sampling point is reached, the resistance value of the current divider of each time sampling point is collected; and taking the shunt resistance values of all the time sampling points as the shunt resistance values of the corresponding falling current sampling points.
9. The method of claim 6, wherein the constructing a drop resistance correction model based on the drop data set comprises: Fitting the data in the descending data set by adopting a two-dimensional polynomial to obtain a current descending baseline model, calculating a correction coefficient of the current descending baseline model by using a least square method, and constructing a target current descending baseline model based on the correction coefficient of the current descending baseline model; Calculating a baseline predicted value of each piece of data in the descending data set by using the correction current descending baseline model; constructing a time correction model according to a descending data set, calculating a correction coefficient of the time correction model according to the data residual error by using a least square method, and constructing a target time correction model based on the correction coefficient of the time correction model; and constructing a dropping resistance correction model based on the target current dropping baseline model and the target time correction model.
10. An electronic device comprising at least one processor and a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-9.

Description

Electric energy meter metering error compensation method based on quick response of non-uniform temperature field Technical Field The present invention relates generally to the field of power systems, and more particularly, to a method for compensating for metering errors in an electric energy meter based on a rapid response to an uneven temperature field. Background The accuracy and reliability of the metering data of the electric energy meter are important bases for metering settlement, line loss analysis and operation regulation and control of the power grid. The electronic electric energy meter is inevitably affected by the common influence of the environmental temperature change and internal self-heating in the actual operation, so that the metering error presents drift characteristics along with the temperature, and the drift is often not in a simple linear relation, but is coupled with factors such as the current load level, the material temperature characteristic, the electrical parameter drift of key devices and the like. For example, the reference voltage of the metering chip drifts along with the temperature change, and the reference voltage of the metering chip can cause the change of the analog-digital conversion reference quantity so as to influence the quantization precision of the sampling quantity, and the voltage dividing resistor for voltage sampling and the sampling resistor (such as a manganese copper material) for current sampling all have temperature coefficients and possibly change in a nonlinear way, so that the equivalent parameters of a voltage/current sampling link change along with the temperature change so as to influence the accuracy of the metering result. The existing mainstream scheme generally integrates a temperature sensor in a metering chip and is matched with a temperature compensation algorithm to correct sampling values or metering results. However, the difference exists among the heating power consumption, the heat path and the temperature rise dynamics of different components in the electric energy meter, and the internal temperature field and the temperature gradient with uneven space are easy to form. In this case, it is difficult to accurately characterize the real working temperature of the key component of the voltage/current sampling link by using a single-point temperature (for example, the internal temperature of the chip or the external environment temperature), so that the temperature input of the compensation model deviates from the actual temperature, and thus the compensation residual error is introduced, and it is difficult to simultaneously consider the compensation precision and the response speed under the wide temperature range and the rapid temperature change working condition. Disclosure of Invention According to the invention, an electric energy meter metering error compensation scheme based on quick response of an uneven temperature field is provided. According to the scheme, the metering accuracy and the metering data reliability of the electric energy meter under the temperature change condition can be improved. In a first aspect of the invention, an electric energy meter metering error compensation method based on quick response of an uneven temperature field is provided. The method comprises the following steps: Obtaining the internal environment temperature, the current value of the current divider load and the resistance value of the current divider of the electric energy meter to be compensated; the method comprises the steps of constructing a resistance correction model according to the internal environment temperature, a current value of a shunt load and a current change trend, correcting the resistance value of the shunt by using the resistance correction model, and obtaining a target resistance value of the shunt; and compensating the metering error of the electric energy meter based on the target shunt resistance value. Further, the constructing a resistance correction model according to the internal environment temperature, the current value of the shunt load and the current variation trend includes: When the current change trend is rising or unchanged, presetting a temperature step length, and obtaining a rising data set according to the internal environment temperature, the current value of the shunt load and the temperature step length; when the current change trend is descending, presetting a time sampling point, obtaining a descending data set according to the internal environment temperature, the current value of the shunt load and the time sampling point, constructing a descending resistance correction model based on the descending data set, and taking the descending resistance correction model as a final resistance correction model. Further, the step-up data set obtained according to the internal environment temperature, the shunt load current value and the temperature step comprises the following steps: setting an upward