CN114994382A

CN114994382A - Temperature compensation method and device for electric energy metering, electric energy metering device and medium

Info

Publication number: CN114994382A
Application number: CN202210827095.9A
Authority: CN
Inventors: 任振东; 周颖; 李猛; 程显明; 李大鹏; 孙溪童
Original assignee: Beijing Smartchip Microelectronics Technology Co Ltd; Beijing Smartchip Semiconductor Technology Co Ltd
Current assignee: Beijing Smartchip Microelectronics Technology Co Ltd; Beijing Smartchip Semiconductor Technology Co Ltd
Priority date: 2022-07-14
Filing date: 2022-07-14
Publication date: 2022-09-02
Anticipated expiration: 2042-07-14
Also published as: CN114994382B

Abstract

The disclosure relates to the technical field of electric energy metering, in particular to a temperature compensation method and device for electric energy metering, an electric energy metering device and a medium, wherein the temperature compensation method for electric energy metering comprises the steps of obtaining first temperature data T1 sent by a first temperature sensor for measuring the temperature of a primary side current transformer; acquiring second temperature data T2 sent by a second temperature sensor for measuring the temperature of the secondary side combined transformer; acquiring third temperature data TP sent by a third temperature sensor for measuring the temperature of the secondary side level matching resistance network; correcting a correction value in the metering unit according to the first temperature data T1, the second temperature data T2 and the third temperature data TP, wherein the correction value is used for calibrating the metering data obtained by the metering unit. The metering data obtained by the metering unit can be subjected to temperature compensation, and the metering precision of electric energy metering is further ensured.

Description

Temperature compensation method and device for electric energy metering, electric energy metering device and medium

Technical Field

The disclosure relates to the technical field of electric energy metering, in particular to a temperature compensation method and device for electric energy metering, an electric energy metering device and a medium.

Background

The importance of accurate electric energy metering is increasingly highlighted, and the accuracy of mutual inductor measurement in electric energy metering is one of important conditions for ensuring the accuracy of electric energy metering. The temperature has an important influence on the measurement of the mutual inductor, and the change of the temperature can cause the magnetic conductivity of the magnetic material of the mutual inductor to change, thereby causing the transformation ratio and the phase difference of the mutual inductor to change, and further influencing the precision of electric energy measurement. The current electric energy metering precision can be caused by day and night temperature difference of the same region or temperature difference of different regions.

The current system for electrical energy metering is calibrated only at a reference temperature of 23 degrees. According to technical specification of Q GDW 1827-2013 three-phase intelligent electric energy meter, the maximum allowable value of the temperature coefficient of a 0.5-level meter connected through a transformer is 0.03%, when the temperature is changed from 23 ℃ to minus 37 ℃, the maximum allowable value of the metering error is 1.8%, the accumulated electric energy of the 1.8% error is huge for a closed meter, the payment for users is unfair, and the line loss index can be influenced for distribution internet of things intelligent equipment such as a station area intelligent fusion terminal and the like. Therefore, how to reduce the influence of the temperature difference on the electric energy metering accuracy becomes a technical problem to be solved urgently by those skilled in the art.

Disclosure of Invention

In order to solve the problems in the related art, embodiments of the present disclosure provide a method and an apparatus for temperature compensation of electric energy metering, an electric energy metering apparatus, and a medium.

In a first aspect, an embodiment of the present disclosure provides a temperature compensation method for electric energy metering, which is applied to a temperature compensation device, where the temperature compensation device includes a primary-side current transformer, a secondary-side combined transformer, and a secondary-side level matching resistor network, and the method includes:

acquiring first temperature data T1 sent by a first temperature sensor for measuring the temperature of the primary side current transformer;

acquiring second temperature data T2 sent by a second temperature sensor for measuring the temperature of the secondary side combined transformer;

acquiring third temperature data TP sent by a third temperature sensor for measuring the temperature of the secondary side level matching resistance network;

correcting a correction value in the metering unit according to the first temperature data T1, the second temperature data T2 and the third temperature data TP, wherein the correction value is used for calibrating the metering data obtained by the metering unit.

According to an embodiment of the present disclosure, the correcting the correction value in the metering unit according to the first temperature data T1, the second temperature data T2 and the third temperature data TP includes:

correcting values in the metering units according to the first temperature data T1, the second temperature data T2 and the third temperature data TP received at each timing.

According to an embodiment of the present disclosure, the correcting a correction value in a metering unit according to the first temperature data T1, the second temperature data T2 and the third temperature data TP includes:

looking up correction coefficients corresponding to the first temperature data T1, the second temperature data T2 and the third temperature data TP respectively in a temperature coefficient table;

and correcting the correction value in the metering unit according to the correction coefficient.

According to an embodiment of the present disclosure, the looking up correction coefficients corresponding to the first temperature data T1, the second temperature data T2 and the third temperature data TP, respectively, in a temperature coefficient table includes:

and searching a current change ratio value KI11 and a current phase difference JI11 corresponding to the first temperature data T1 and a current change ratio value KI1 and a current phase difference JI1 corresponding to normal temperature data in a first temperature coefficient table of the primary side current transformer.

According to an embodiment of the present disclosure, the searching for the correction coefficients corresponding to the first temperature data T1, the second temperature data T2, and the third temperature data TP in a temperature coefficient table further includes:

and searching an electrorheological ratio value KI22, a current phase difference JI22, a voltage difference value KV22 and a voltage phase difference JV22 which correspond to the second temperature data T2, and an electrorheological ratio value KI2, a current phase difference JI2, a voltage difference value KV2 and a voltage phase difference JV2 which correspond to the normal-temperature data in a second temperature coefficient table of the secondary-side combined transformer.

and searching a current signal level matching resistor RIP and a voltage signal level matching resistor RVP corresponding to the third temperature data TP, and a current signal level matching resistor RI and a voltage signal level matching resistor RV corresponding to the normal temperature data in a third temperature coefficient table of the secondary side level matching resistor network.

According to an embodiment of the present disclosure, the modifying the correction value in the metering unit according to the correction coefficient includes:

correcting the current correction value in the metering unit using the following formula:

wherein, X _IA(new) For new current correction values, X _IA(old) Is a correction value of the primary current stored in the metering unit.

According to an embodiment of the present disclosure, the correcting the correction value in the metering unit according to the correction coefficient includes:

correcting the voltage correction value in the metering unit using the following formula:

wherein, X _VA(new) For new voltage correction values, X _VA(old) Is the original voltage correction value stored in the metering unit.

correcting the phase difference correction value in the metering unit using the following formula:

wherein, JX _A(new) For new phase difference correction values, JX _A(old) Is the original phase difference correction value stored in the metering unit.

According to an embodiment of the present disclosure, the method further comprises:

the metering unit acquires metering data output by the metering module;

and correcting the acquired metering data according to the correction value in the metering unit to obtain calibrated metering data.

According to an embodiment of the present disclosure, the metering modules include a primary-side metering module and a secondary-side metering module;

the primary side metering module collects a current signal and outputs the current signal to the secondary side metering module;

the secondary side metering module collects a voltage signal, processes the current signal and the collected voltage signal obtained from the primary side metering module, and outputs the processed current signal, the processed voltage signal and a phase difference signal of the current and the voltage to the metering unit;

and the metering unit obtains metering data according to the processed current signal, the processed voltage signal and the phase difference signal of the current and the voltage.

According to the embodiment of the disclosure, the primary side current transformer is located in the primary side metering module, the secondary side combined transformer and the secondary side level matching resistance network are located in the secondary side metering module, and the secondary side combined transformer comprises a secondary side current transformer and a secondary side voltage transformer.

the first temperature sensor is used for measuring the temperature of the magnetic materials of the primary side current transformer, and/or the second temperature sensor is used for measuring the temperature of the magnetic materials of the secondary side combined transformer.

In a second aspect, an embodiment of the present disclosure provides a temperature compensation device for electric energy metering, where the temperature compensation device includes a primary side current transformer, a secondary side combined transformer, and a secondary side level matching resistor network, and the temperature compensation device further includes:

a first temperature sensor configured to collect first temperature data T1 of the temperature of the primary-side current transformer;

a second temperature sensor configured to acquire second temperature data T2 of the secondary side combined transformer;

a third temperature sensor configured to acquire third temperature data TP of the secondary side level matching resistance network;

the metering unit and the processor are configured to correct a correction value in the metering unit according to the first temperature data T1, the second temperature data T2 and the third temperature data TP, wherein the correction value is used for calibrating the metering data obtained by the metering unit.

According to an embodiment of the present disclosure, the treatment appliance is configured to:

correcting the correction value in the metering unit according to the first temperature data T1, the second temperature data T2 and the third temperature data TP received at each timing.

and searching a current change ratio value KI22, a current phase difference JI22, a voltage change ratio value KV22 and a voltage phase difference JV22 corresponding to the second temperature data T2, and a current change ratio value KI2, a current phase difference JI2, a voltage change ratio value KV2 and a voltage phase difference JV2 corresponding to the normal temperature data in a second temperature coefficient table of the secondary-side combined transformer.

wherein X _IA(new) For new current correction values, X _IA(old) Is a correction value of the primary current stored in the metering unit.

According to an embodiment of the present disclosure, the apparatus further comprises a metering module configured to:

acquiring metering data output by the metering module;

the primary side metering module is configured to collect a current signal and output the current signal to the secondary side metering module;

the secondary side metering module is configured to collect a voltage signal, process the current signal and the collected voltage signal acquired from the primary side metering module, and output the processed current signal, voltage signal and phase difference signal of current and voltage to the metering unit;

the metering unit is specifically configured to obtain metering data according to the processed current signal, voltage signal and phase difference signal of current and voltage.

According to an embodiment of the present disclosure, the primary-side metering module includes the primary-side current transformer and the first temperature sensor;

the secondary side metering module comprises the secondary side combined transformer and a secondary side level matching resistance network, and the secondary side combined transformer comprises a secondary side current transformer and a secondary side voltage transformer.

According to an embodiment of the disclosure, the first temperature sensor is used for measuring the temperature of the magnetic materials of the primary side current transformer, and/or the second temperature sensor is used for measuring the temperature of the magnetic materials of the secondary side combined transformer.

According to the embodiment of the disclosure, the secondary side metering module further comprises a wireless transmission unit, the wireless transmission unit is connected with the processor, and the wireless transmission unit is used for carrying out wireless communication with the first temperature sensor and transmitting received first temperature data sent by the first temperature sensor to the processor.

In a third aspect, the disclosed embodiments provide an electric energy metering device comprising a memory and a processor, wherein the memory is configured to store one or more computer instructions, wherein the one or more computer instructions are executed by the processor to implement any one of the methods according to the first aspect.

In a fourth aspect, the disclosed embodiments provide a computer-readable storage medium having stored thereon computer instructions which, when executed by a processor, implement the method according to the first aspect.

According to the technical scheme provided by the embodiment of the disclosure, the temperature data varying with the application environment in the system can be obtained through the first temperature sensor for measuring the temperature of the primary side current transformer, the second temperature sensor for measuring the temperature of the secondary side combined transformer and the third temperature sensor for measuring the secondary side level matching resistance network, the correction value is corrected according to the temperature data, the metering data obtained by the metering unit can be subjected to temperature compensation, and the metering precision of electric energy metering is further ensured.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

Other features, objects, and advantages of the present disclosure will become more apparent from the following detailed description of non-limiting embodiments when taken in conjunction with the accompanying drawings. In the drawings.

Fig. 1 shows a block diagram of a temperature compensation device for electrical energy metering according to an embodiment of the present disclosure.

FIG. 2 shows a flow chart of a method of temperature compensation for electrical energy metering in accordance with an embodiment of the present disclosure.

FIG. 3 shows a flow chart of a method of temperature compensation for electrical energy metering in accordance with an embodiment of the present disclosure.

Fig. 4 shows a block diagram of a module structure of a processor in a temperature compensation device for electric energy metering according to an embodiment of the present disclosure.

Fig. 5 shows a block diagram of the electric energy metering device according to an embodiment of the present disclosure.

FIG. 6 shows a schematic block diagram of a computer system suitable for use in implementing a method according to an embodiment of the present disclosure.

Detailed Description

Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement them. Furthermore, parts that are not relevant to the description of the exemplary embodiments have been omitted from the drawings for the sake of clarity.

In the present disclosure, it is to be understood that terms such as "including" or "having," etc., are intended to indicate the presence of the disclosed features, numbers, steps, behaviors, components, parts, or combinations thereof, and are not intended to preclude the possibility that one or more other features, numbers, steps, behaviors, components, parts, or combinations thereof may be present or added.

It should be further noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

In the present disclosure, if an operation of acquiring user information or user data or an operation of presenting user information or user data to others is involved, the operations are all operations authorized, confirmed by a user, or actively selected by the user.

Because the influence of the temperature on the current electric energy metering is large, the abnormal temperature may cause inaccuracy of the electric energy metering, and therefore, how to compensate the electric energy metering under various environmental temperatures becomes a technical problem to be solved by the present disclosure. The present disclosure provides a temperature compensation device for electric energy metering, which includes a primary side metering module and a secondary side metering module; the primary side metering module comprises a primary side current transformer and a first temperature sensor for measuring the temperature of the primary side current transformer; the secondary side metering module comprises a secondary side combined transformer, a second temperature sensor, a secondary side level matching resistance network, a third temperature sensor, a metering unit and a processor, wherein the second temperature sensor is used for measuring the temperature of the secondary side combined transformer; the processor is used for receiving the temperature data sent by the first temperature sensor, the second temperature sensor and the third temperature sensor, and correcting a correction value in the metering unit according to the temperature data, wherein the correction value is used for calibrating the metering data obtained by the metering unit. The temperature data of the components in the primary side metering module and the secondary side metering module are obtained, and the correction value in the metering unit can be corrected according to the temperature data, so that the metering data obtained by the metering unit is more accurate, and the influence of temperature difference on the electric energy metering precision is reduced.

Fig. 1 shows a block diagram of a temperature compensation device for electrical energy metering according to an embodiment of the present disclosure. As shown in fig. 1, the temperature compensation apparatus for electric energy metering includes a primary-side metering module 101 and a secondary-side metering module 102, wherein the primary-side metering module 101 includes primary-side current transformers CT1_ A, CT1_ B and CT1_ C, which are respectively used for measuring A, B, C phase current signals in a power distribution network. In addition, the primary-side metering module 101 further includes first temperature sensors TS1_ a, TS1_ B, and TS1_ C, where the first temperature sensors TS1_ a, TS1_ B, and TS1_ C are used to measure the temperatures of the primary-side current transformers CT1_ A, CT1_ B and CT1_ C, respectively. The secondary-side metering module 102 includes secondary-side combined transformers CT2_ a, CT2_ B, CT2_ C and second temperature sensors TS2_ a, TS2_ B, TS2_ C, secondary-side combined transformers CT2_ a, CT2_ B, CT2_ C respectively associated with CT1_ a, CT1_ B, CT1_ C for receiving measurement parameters of the primary-side metering module, such as measured current signals and/or voltage signals, and the second temperature sensors for measuring temperatures of the secondary-side combined transformers. The secondary-side metering module 102 further includes a secondary-side level-matching resistor network, such as current signal level-matching resistor networks IR _ a, IR _ B, IR _ C, voltage signal level-matching resistor networks VR _ a, VR _ B, and VR _ C, and third temperature sensors TS3_ a, TS3_ B, TS3_ C, third temperature sensors TS3_ a, TS3_ B, and TS3_ C for measuring temperatures of the secondary-side level-matching resistor network, respectively. Further, the secondary side metering module 102 further includes a metering unit 1021, a processor 1022, and the like, and is configured to further process the signal passing through the combined mutual inductance sensors CT2_ a, CT2_ B and CT2_ C and the secondary side level matching resistor network to obtain metering data, so as to implement power metering on the distribution network.

How the metering unit obtains the metering data is described below by taking a transmission process of the a-phase current signal at normal temperature as an example. It should be understood that a voltage signal, a phase difference signal, and the like may also be transmitted between the primary side and the secondary side of the power distribution network, and the transmission process is the same as the transmission process of the current signal, and the following transmission processes may be referred to together.

It is assumed that, at normal temperature, the primary side current transformer measures an a-phase current value of I1_ a and a voltage value of V1_ a, and the phase difference between the two is J1_ a. The current signal with current value I1_ A is output as the current signal with current value I2_ A through the primary side current transformer CT1_ A, then output as the current signal with current value I3_ A through the secondary side combined transformer CT2_ A, then output as the current signal with current value I4_ A through the current signal secondary side level matching resistance network IR _ A, the current signal with current value I4_ A is input into the metering unit 1021, and is measured as I5_ A by the metering unit 1021, and the metering unit is based on the current correction value X at the existing normal temperature _IA The measured I5_ a is corrected to obtain a corrected current value of I6_ a, specifically, I6_ a = X _IA I5_ a. Wherein, I6_ A is substantially the same as I1_ A, and the metering unit enables the metering data to be accurately acquired through the correction value. Similarly, the metering unit can correct the measured voltage signal and the measured phase difference according to the voltage correction value and the phase difference correction value respectively so as to enable the measured metering data to be accurate. Furthermore, the metering unit multiplies the calibrated current value and the calibrated voltage value to obtain a real-time active power value, and performs continuous time integration processing on the real-time active power value to obtain an active power value.

It should be noted that the above-mentioned metering data is obtained at normal temperature, and the current correction value X _IA The current correction value at normal temperature is also a fixed calibration value stored by the metering unit. In the prior art, the metering unit calibrates the measured metering data only according to a fixed calibration value, and does not consider the influence of temperature difference on the calibration process, which usually causes errors in the calibrated metering data. For example, if I1_ A is unchanged but at least one of I2_ A, I3_ A and I4_ A is changed according to temperature when the temperature is changed, a measurement error of I6_ A is caused, and the measurement error is corrected by the current correction value X at normal temperature _IA Cannot be compensated for.

Based on the situation, the temperature sensors are arranged on the current transformer on one side, the combined transformer on the secondary side and the level matching resistor network on the secondary side, so that the temperature of each node in the measurement signal transmission process can be sensed, the temperature compensation of all nodes can be realized, and the accuracy of measurement data is ensured.

In one embodiment, the temperature compensation device for power metering shown in fig. 1 further includes a wireless transmission unit 1023 and a power supply module 1024. The wireless transmission unit 1023 may be connected to the first temperature sensors TS1_ a, TS1_ B, and TS1_ C for bidirectional wireless communication, and is configured to receive the temperature data of the first temperature sensors TS1_ a, TS1_ B, and TS1_ C and transmit the temperature data to the processor 1022, so that the processor 1022 may further modify the correction value in the metering unit 1021 according to the temperature data. Also, the wireless transmission unit 1023 may receive a control instruction of the processor 1022 to control the data collection frequency of the first temperature sensor or to specify the first temperature sensor, etc. Optionally, the wireless transmission unit 1023 may also receive the temperature data of the second temperature sensors TS2_ a, TS2_ B, TS2_ C or TS3_ a, TS3_ B, TS3_ C wirelessly. Of course, the second temperature sensors TS2_ a, TS2_ B, TS2_ C or TS3_ a, TS3_ B, TS3_ C may also transmit the temperature data to the processor 1022 through other methods besides via the wireless transmission unit 1023, such as a wired method, etc., which is not limited herein.

The first temperature sensor or other temperature sensors can be realized as a wireless temperature sensor, namely the first temperature sensor transmits the acquired temperature data to the outside in a wireless mode; or the first temperature sensor or other temperature sensors are internally or externally provided with a wireless module, and the wireless module and the wireless transmission unit 1023 realize wireless communication.

The wireless transmission unit 1023 can be implemented as a power distribution cabinet body area network wireless base station, and the power distribution cabinet body area network is composed of a wireless environment sensing sensor, such as a first temperature sensor or other environment sensing sensors, and a wireless base station, wherein the environment sensing sensor is located on the primary side of the power distribution network, and the wireless base station is located on the secondary side of the power distribution network. The environmental sensor may include information sensors such as humidity and switching value, in addition to the temperature sensor, which is not limited herein.

The power module 1024 may be connected to other components or at least some components of the apparatus to provide power for the secondary side metering module, and the connection manner of the power module 1024 to other modules is not limited.

In one embodiment, the first temperature sensors TS1_ a, TS1_ B, TS1_ C may be attached to the magnetic material surfaces of the primary current transformers CT1_ A, CT1_ B and CT1_ C, such as adhered, attached or other attaching means, which may be used to directly measure the magnetic material surface temperatures of the primary current transformers CT1_ A, CT1_ B and CT1_ C, since the magnetic material temperature of the primary current transformers changes most obviously with the ambient temperature, and the temperature sensed by the first temperature sensors attached to the magnetic material of the primary current transformers is more accurate. Of course, the first temperature sensor may also be associated with the primary-side current transformer in other ways, such as the first temperature sensor collecting temperature data of an environment where the primary-side current transformer is located, or the first temperature sensor being attached to other transformers, and the like, which is not limited herein.

In one embodiment, the primary-side metering module may further include other transformers, such as a primary-side voltage transformer; alternatively, the primary side current transformer may implement measurement of a current signal and a voltage signal, and further implement transmission of the primary side current signal and/or the voltage signal. The secondary-side combined transformers CT2_ a, CT2_ B, and CT2_ C may include a secondary-side current transformer and a secondary-side voltage transformer, and the second temperature sensors TS2_ a, TS2_ B, TS2_ C may be attached to the secondary-side current transformer, the secondary-side voltage transformer, or both. Because the temperature of the magnetic material of the mutual inductor obviously changes along with the ambient temperature, the temperature sensed by the second temperature sensor attached to the magnetic material of the mutual inductor is more accurate. The attachment of the second temperature sensor to the magnetic material of the transformer can be referred to the attachment of the first temperature sensor. The second temperature sensor may also be associated with the secondary side current transformer and the secondary side voltage transformer in other ways, for example, the secondary side current transformer and the secondary side voltage transformer are on the same circuit board, and the second temperature sensor is also disposed on the circuit board and configured to sense a temperature of the circuit board or an ambient temperature where the secondary side current transformer and the secondary side voltage transformer are located. If the secondary side current transformer and the secondary side voltage transformer are integrated in the same chip, the second temperature sensor can be attached to the surface of the chip and used for sensing the accurate temperature. The temperature data collected by the second temperature sensor may be directly transmitted to the metering unit 1021 or the processor 1022, or may be transmitted to the metering unit 1021 or the processor 1022 through the secondary-side combined transformer, which is not limited herein.

In one embodiment, the secondary side level matching resistor network includes current signal level matching resistor networks IR _ a, IR _ B, IR _ C and voltage signal level matching resistor networks VR _ a, VR _ B, VR _ C. The third temperature sensors TS3_ a, TS3_ B, TS3_ C may collect temperature data of the current signal level-matched resistor networks IR _ a, IR _ B, IR _ C, or temperature data of the voltage signal level-matched resistor networks VR _ a, VR _ B, VR _ C, or temperature data of both together, such as temperature data of the environment in which they are located. The third temperature sensor may be attached to a certain device of the secondary side level matching resistance network to acquire the temperature of the surface of the magnetic material, or acquire the ambient temperature of the secondary side level matching resistance network, or be installed on a circuit board of the secondary side level matching resistance network to acquire the temperature of the circuit board or the ambient temperature, etc., which is not limited herein. Similarly, the transmission mode of the temperature data collected by the third temperature sensor may refer to the transmission mode of the temperature data collected by the second temperature sensor, and the transmission modes may be the same or different.

In one embodiment, the implementation of the metering unit 1021 may be an integrated metering chip. Processor 1022 may be integrated within the metrology chip or provided separately from the metrology chip to enhance the processing capabilities of existing metrology chips for data.

In one embodiment, the components in the secondary side metering module may be integrated or exist independently, for example, the wireless transmission unit 1023 may be integrated in the metering unit 1021 or the processor 1022, or the wireless transmission unit 1023 may exist independently from the metering unit 1021 or the processor 1022. The secondary side metering module can be integrated into an electric energy metering device in the following embodiments, and can be sold as an independent product or sold together with a power distribution network.

The implementation of the processor 1022 to correct the correction value in the metering unit based on the collected temperature data will be described in detail below in connection with the method embodiment.

FIG. 2 shows a flow chart of a method of temperature compensation of electrical energy metering according to an embodiment of the present disclosure. As shown in fig. 2, the method for compensating the temperature of the electric energy metering is applied to a temperature compensation device, the temperature compensation device comprises a primary side current transformer, a secondary side combined transformer and a secondary side level matching resistor network, and the method comprises the following steps S101-S104:

in step S101, first temperature data T1 sent by a first temperature sensor for measuring the temperature of the primary-side current transformer is acquired;

specifically, the "primary side current transformer" of the present disclosure refers to a current transformer electrically connected to any one of three phases of power on the primary side A, B, C of the power distribution network, and is used for measuring a current signal of any one of the connected phases, and further, collecting a voltage signal, a phase difference signal, and the like. The "temperature of the primary-side current transformer" in the present disclosure refers to a temperature related to a temperature change of the primary-side current transformer, such as a magnetic material temperature of the primary-side current transformer, e.g., a surface temperature of the magnetic material, an environmental temperature in which the primary-side current transformer is located, and the like. The first temperature data is represented in this disclosure as T1.

In step S102, second temperature data T2 sent by a second temperature sensor for measuring the temperature of the secondary side combined transformer is acquired;

specifically, in combination with the above device description, the "secondary side combined transformer" of the present disclosure refers to a transformer that is located on the secondary side of the power distribution network and can transmit signals with the primary side current transformer, and the secondary side combined transformer may include a secondary side current transformer, a secondary side voltage transformer, and the like. The "temperature of the secondary-side combined transformer" in the present disclosure means a temperature that reflects a change in an environmental temperature of the secondary-side combined transformer or a temperature related to a change in a magnetic material temperature of the secondary-side combined transformer, for example, any one of a magnetic material temperature of the secondary-side current transformer, such as a magnetic material surface temperature, a magnetic material temperature of the secondary-side voltage transformer, such as a magnetic material surface temperature, a magnetic material temperature of the secondary-side combined transformer, such as a magnetic material surface temperature, or an environmental temperature in the transformer. The second temperature data in this disclosure is represented by T1.

In step S103, third temperature data TP sent by a third temperature sensor for measuring a secondary side level matching resistance network is acquired;

specifically, described in conjunction with the above device, the "secondary side level matching resistor network" of the present disclosure refers to a resistor network located on the secondary side of the power distribution network for receiving and performing level matching resistance processing on the signal of the secondary side combined transformer. The secondary side level matching resistor network may comprise a current signal level matching resistor network or a voltage signal level matching resistor network for processing the current signal and the voltage signal, respectively. The "secondary side level matching resistance network temperature" in the present disclosure means a temperature representing a change in an ambient temperature of the secondary side level matching resistance network or a change in a magnetic material temperature of the secondary side level matching resistance network itself, for example, a magnetic material surface temperature of an integrated chip of the current signal level matching resistance network or the voltage signal level matching resistance network, or an ambient temperature of the current signal level matching resistance network or the voltage signal level matching resistance network, or a temperature of a circuit board in which the current signal level matching resistance network or the voltage signal level matching resistance network is located, or the like. The third temperature data in this disclosure is denoted by TP.

According to the embodiment of the present disclosure, the execution sequence of steps S101 to S103 may be in order; or executed in parallel; or, the execution sequence is changed, for example, the execution sequence is S102, S101, S103, etc., which is not limited herein. The present embodiment is explained by taking the sequential execution as an example.

In step S104, a correction value in the metering unit is corrected according to the first temperature data T1, the second temperature data T2 and the third temperature data TP, wherein the correction value is used for calibrating the metering data obtained by the metering unit.

Specifically, the "metering unit" in the present disclosure refers to a unit that collects metering data for metering electric energy and performs metering calculation based on the metering data. The "measurement data" in this disclosure refers to signal values, such as current values, voltage values, phase difference values, etc., obtained by the measurement unit from the secondary side level matching resistance network and subjected to processing or loss, participating in the calculation of the active electric energy value. The "correction value" in the present disclosure is used to calibrate the measurement data obtained by the measurement unit to be close to the initial measurement value, such as the primary current value, the primary voltage value or the primary phase value, and the initial value of the "correction value" may be understood as a correction value at normal temperature, which is configured in the factory parameters of the measurement unit as a conventional setting value. The correction in the disclosure refers to an operation process of correcting the correction value by considering the temperature influence, so that the correction value is more suitable for the environment of the power distribution network, and the calculation and operation accuracy of the metering unit is further ensured.

In one embodiment, one or more of the first temperature data T1, the second temperature data T2, and the third temperature data TP may participate in correcting the correction value in the metering unit.

In one embodiment, the correcting the correction value in the metering unit according to the first temperature data T1, the second temperature data T2 and the third temperature data TP includes: correcting the correction value in the metering unit according to the first temperature data T1, the second temperature data T2 and the third temperature data TP received at each timing. Specifically, the first temperature data T1, the second temperature data T2, and the third temperature data TP may be acquired at regular time, and the correction values in the metering unit may be corrected according to the first temperature data T1, the second temperature data T2, and the third temperature data TP received each time. For example, the temperature data can be acquired once per minute, so that the correction value can be corrected in time, and the accuracy of the electric energy metering operation of the metering unit is ensured. The timing duration is not limited herein.

In one embodiment, the temperature data may be mapped to the correction coefficient to further modify the correction value. The mapping relationship may form a temperature coefficient table, and in a specific implementation, the step S104 may include the following steps S201 to S202:

as shown in fig. 3, in step S201, correction coefficients corresponding to the first temperature data T1, the second temperature data T2 and the third temperature data TP, respectively, are looked up in a temperature coefficient table;

specifically, the current change ratio value KI11 and the current phase difference JI11 corresponding to the first temperature data T1 and the current change ratio value KI1 and the current phase difference JI1 corresponding to the normal temperature data are searched in the first temperature coefficient table of the primary side current transformer.

The "first temperature coefficient table" in the present disclosure is used to store a mapping relationship between each temperature data and a correction coefficient in a measurement temperature interval for measuring the primary-side current transformer, and after the first temperature sensor acquires the first temperature data T1, a correction coefficient corresponding to the first temperature data may be acquired in the first temperature coefficient table. The correction coefficient is a parameter directly corresponding to the first temperature data T1, such as an electrorheological ratio KI11 and a current phase difference JI11, under which condition, the correction coefficient corresponding to the normal temperature data, such as an electrorheological ratio KI1 and a current phase difference JI1, is also required to be obtained; or the correction coefficient is a ratio of a parameter corresponding to the first temperature data T1 to a parameter corresponding to the normal temperature data, such as a ratio KI11/KI1 of a current ratio KI11 to KI1, a ratio JI11/JI1 of a current phase difference JI11 to JI1, and the like.

The "second temperature coefficient table" in the present disclosure is used to store a mapping relationship between each temperature data and a correction coefficient in a measurement temperature interval for measuring the secondary-side combined transformer, and after the second temperature sensor acquires the second temperature data T2, a correction coefficient corresponding to the second temperature data T2 may be acquired in the second temperature coefficient table. The correction coefficients can be a current-to-current ratio KI22, a current phase difference JI22, a voltage-to-voltage ratio KV22 and a voltage phase difference JV22, and under the condition, correction coefficients corresponding to normal-temperature data, such as the current-to-current ratio KI2, the current phase difference JI2, the voltage-to-voltage ratio KV2 and the voltage phase difference JV2, need to be acquired; or the correction coefficient is the ratio of the parameter corresponding to the second temperature data T2 to the parameter corresponding to the normal temperature data, such as KI22/KI2, JI 22/JI 2, KV22/KV2, JV22/JV2, etc.

The "third temperature coefficient table" in the present disclosure is used to store a mapping relationship between each temperature data and a correction coefficient in a measurement temperature interval for measuring the secondary side level matching resistance network, and after the third temperature sensor acquires the third temperature data TP, a correction coefficient corresponding to the third temperature data TP may be acquired in the third temperature coefficient table. The correction coefficient may refer to a current signal level matching resistor RIP and a voltage signal level matching resistor RVP, and in this case, correction coefficients for normal temperature data pairs, such as a current signal level matching resistor RI and a voltage signal level matching resistor RV, need to be obtained; or the correction coefficient is the ratio of the parameter corresponding to the third temperature data TP to the parameter corresponding to the normal temperature data, such as RIP/RI, RVP/RV, etc.

In an embodiment, the temperature coefficient table is obtained by mapping the correction coefficients acquired by the apparatus provided in the present disclosure at different test temperatures, and is pre-stored in the apparatus of the present disclosure, such as the metering unit 1021, or the processor 1022. The mapping relation between the temperature data and the correction coefficient can be visually determined through the temperature coefficient table, and the metering operation efficiency is improved.

In one embodiment, the temperature coefficient table may be combined into a temperature coefficient table to facilitate retrieval.

The normal temperature data in the present disclosure is usually 23 degrees, and may be adjusted according to the application environment of the device, or set as another temperature value, or use the temperature data for the calibration value stored in the device as the normal temperature data.

In step S202, the correction value in the metering unit is corrected according to the correction coefficient.

Specifically, the current correction value in the metering unit is corrected using the following formula:

wherein X _IA(new) For new current correction values, X _IA(old) KI11/KI1 represents the correction values for the primary current stored in the metering unit in a first temperature coefficient tableThe ratio of the current change ratio value corresponding to the first temperature data T1 to the current change ratio value KI1 corresponding to the normal temperature data is KI22/KI2, the ratio of the current change ratio value KI22 corresponding to the second temperature data T2 to the current change ratio value KI2 corresponding to the normal temperature data in the second temperature coefficient table is represented by RIP/RI, and the ratio of the current signal level matching resistance RIP corresponding to the third temperature data TP to the current signal level matching resistance RI corresponding to the normal temperature data in the third temperature coefficient table is represented by RIP/RI. X _IA(old) The product of the three ratios can obtain X _IA(new) 。

Alternatively, the voltage correction value in the metering unit is corrected using the following formula:

wherein, X _VA(new) For new voltage correction values, X _VA(old) For the original voltage correction value stored in the metering unit, KV22/KV2 indicates a ratio of a voltage ratio KV22 corresponding to the second temperature data T2 in the second temperature coefficient table to a voltage ratio KV2 corresponding to the normal temperature data, and RVP/RV indicates a ratio of a voltage signal level matching resistance RVP corresponding to the third temperature data TP in the third temperature coefficient table to a voltage signal level matching resistance RV corresponding to the normal temperature data. X _VA(old) The product of the two ratios can obtain X _VA(new) 。

Or, correcting the phase difference correction value in the metering unit by using the following formula:

In an embodiment, at least one correction value can be updated through the at least one formula, the updated new correction value can be stored in a manner of covering the original correction value, when the correction value needs to be updated next time, the stored correction value, namely the updated new correction value, is called again, and the cycle is repeated, so that the temperature compensation is more matched with the environment change where the device is located. Or, in another implementation manner, the original correction value in the metering unit is always the initial value stored in the metering unit, i.e. the regular set value at the time of factory shipment, while the new correction value is stored separately and does not cover the original correction value, and when the correction value needs to be updated next time, the retrieved correction value is the original correction value, i.e. the regular set value at the time of factory shipment. The temperature compensation reference is made more stable.

The metering unit can respectively realize the correction of the correction value of each metering data through the formula, the comprehensiveness of correction is guaranteed, the obtained metering data are calibrated through the new correction value, the accuracy of the metering data can be improved, and the accuracy of electric energy metering is guaranteed.

Before implementing the flow shown in fig. 1 and 2, the apparatus shown in fig. 1 may further include the following steps:

the metering unit 1021 acquires metering data output by the metering module;

and the metering unit 1021 corrects the acquired metering data according to the correction value in the metering unit 1021 to obtain calibrated metering data.

Specifically, the metering modules in the step comprise a primary side metering module and a secondary side metering module;

The implementation of the steps ensures the acquisition and correction of the metering data of the metering unit, and the correction value can be corrected by using the method embodiment disclosed by the invention, so that the metering data after the metering unit is calibrated is more accurate.

Fig. 4 shows a block diagram of a module structure of a processor in a temperature compensation device for electric energy metering according to an embodiment of the present disclosure. Wherein the apparatus may be implemented as part or all of the processor by software, hardware or a combination of both.

As shown in fig. 4, the processor 400 includes a first obtaining module 410, a second obtaining module 420, a third obtaining module 430, and a modifying module 440.

The first obtaining module 410 is configured to obtain first temperature data T1 sent by a first temperature sensor for measuring a temperature of the primary-side current transformer;

a second obtaining module 420, configured to obtain second temperature data T2 sent by a second temperature sensor for measuring a temperature of a secondary-side combined transformer;

a third obtaining module 430, configured to obtain third temperature data TP sent by a third temperature sensor for measuring a secondary side level matching resistor network temperature;

a correcting module 440, configured to correct a correction value in the metering unit according to the first temperature data T1, the second temperature data T2, and the third temperature data TP, where the correction value is used to calibrate the metering data obtained by the metering unit.

According to the technical scheme provided by the embodiment of the disclosure, the temperature data varying with the application environment in the device can be obtained through the first temperature sensor for measuring the temperature of the primary side current transformer, the second temperature sensor for measuring the temperature of the secondary side combined transformer and the third temperature sensor for measuring the secondary side level matching resistance network, the correction value is corrected according to the temperature data, the metering data obtained by the metering unit can be subjected to temperature compensation, and the metering precision of electric energy metering is further ensured.

According to an embodiment of the present disclosure, the modification module 440 is specifically configured to:

The correction value can be corrected in time, and the accuracy of electric energy metering operation of the metering unit is guaranteed.

The mapping relation between the temperature data and the correction coefficient can be visually determined through the temperature coefficient table, and the metering operation efficiency is improved.

According to an embodiment of the disclosure, the modification module 440 is configured to look up correction coefficients corresponding to the first temperature data T1, the second temperature data T2, and the third temperature data TP in a temperature coefficient table, and is specifically configured to:

According to an embodiment of the disclosure, the modification module 440 is configured to look up, in a temperature coefficient table, correction coefficients corresponding to the first temperature data T1, the second temperature data T2, and the third temperature data TP, and is specifically configured to:

According to an embodiment of the present disclosure, the modifying module 440 is configured to modify the correction value in the metering unit according to the correction coefficient, and is configured to:

According to an embodiment of the present disclosure, the modifying module 440 is configured to modify the correction value in the metering unit according to the correction coefficient, specifically to:

The present disclosure also discloses an electric energy metering device, and fig. 5 shows a structural block diagram of the electric energy metering device according to an embodiment of the present disclosure.

As shown in fig. 5, the electric energy metering device includes a memory and a processor, wherein the memory is configured to store one or more computer instructions, wherein the one or more computer instructions are executed by the processor to implement a method according to an embodiment of the present disclosure. Of course, the structure of the electric energy metering device may have other implementations, for example, see some or all of the components in the temperature compensation device of the electric energy metering in fig. 1.

The method comprises the following steps:

In one embodiment, the method further comprises:

the first temperature data T1, the second temperature data T2 and the third temperature data TP are acquired at regular time, and correction values in the metering unit are corrected according to the first temperature data T1, the second temperature data T2 and the third temperature data TP received each time.

In one embodiment, the correcting the correction value in the metering unit according to the first temperature data T1, the second temperature data T2 and the third temperature data TP includes:

In one embodiment, the looking up the correction coefficients corresponding to the first temperature data T1, the second temperature data T2 and the third temperature data TP in a temperature coefficient table includes:

In one embodiment, the searching for the correction coefficient corresponding to the first temperature data T1, the second temperature data T2, and the third temperature data TP in a temperature coefficient table further includes:

In one embodiment, the modifying the correction value in the metering unit according to the correction coefficient includes:

wherein X _IA(new) As a new currentCorrection value, X _IA(old) Is a correction value of the primary current stored in the metering unit.

In one embodiment, said modifying said correction value in said metering unit according to said correction factor comprises:

wherein X _VA(new) For new voltage correction values, X _VA(old) Is the original voltage correction value stored in the metering unit.

correcting the phase difference correction value in the metering unit by using the following formula:

As shown in fig. 6, the computer system includes a processing unit that can execute the various methods in the above-described embodiments according to a program stored in a Read Only Memory (ROM) or a program loaded from a storage section into a Random Access Memory (RAM). In the RAM, various programs and data necessary for the operation of the computer system are also stored. The processing unit, the ROM, and the RAM are connected to each other through a bus. An input/output (I/O) interface is also connected to the bus.

The following components are connected to the I/O interface: an input section including a keyboard, a mouse, and the like; an output section including a display such as a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and the like, and a speaker; a storage section including a hard disk and the like; and a communication section including a network interface card such as a LAN card, a modem, or the like. The communication section performs a communication process via a network such as the internet. The drive is also connected to the I/O interface as needed. A removable medium such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive as necessary, so that a computer program read out therefrom is mounted into the storage section as necessary. The processing unit can be realized as a CPU, a GPU, a TPU, an FPGA, an NPU and other processing units.

In particular, the above described methods may be implemented as computer software programs according to embodiments of the present disclosure. For example, embodiments of the present disclosure include a computer program product comprising a computer program tangibly embodied on a machine-readable medium, the computer program comprising program code for performing the above-described method. In such an embodiment, the computer program may be downloaded and installed from a network via the communication section, and/or installed from a removable medium.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

The units or modules described in the embodiments of the present disclosure may be implemented by software or by programmable hardware. The units or modules described may also be provided in a processor, and the names of the units or modules do not in some cases constitute a limitation of the units or modules themselves.

As another aspect, the present disclosure also provides a computer-readable storage medium, which may be a computer-readable storage medium included in the electronic device or the computer system in the above embodiments; or it may be a separate computer readable storage medium not incorporated into the device. The computer readable storage medium stores one or more programs for use by one or more processors in performing the methods described in the present disclosure.

The foregoing description is only exemplary of the preferred embodiments of the disclosure and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention in the present disclosure is not limited to the specific combination of the above-mentioned features, but also encompasses other embodiments in which any combination of the above-mentioned features or their equivalents is possible without departing from the inventive concept. For example, the above features and (but not limited to) the features disclosed in this disclosure having similar functions are replaced with each other to form the technical solution.

Claims

1. A temperature compensation method for electric energy metering is characterized in that the method is applied to a temperature compensation device, the temperature compensation device comprises a primary side current transformer, a secondary side combined transformer and a secondary side level matching resistor network, and the method comprises the following steps:

2. The method of claim 1, wherein said correcting the correction value in the metering unit according to the first temperature data T1, the second temperature data T2 and the third temperature data TP comprises:

3. The method as claimed in claim 1, wherein said correcting the correction values in the metering unit according to said first temperature data T1, said second temperature data T2 and said third temperature data TP comprises:

4. The method as claimed in claim 3, wherein said looking up the correction coefficients corresponding to the first temperature data T1, the second temperature data T2 and the third temperature data TP in a temperature coefficient table comprises:

5. The method as claimed in claim 4, wherein the looking up the correction coefficients corresponding to the first temperature data T1, the second temperature data T2 and the third temperature data TP in a temperature coefficient table further comprises:

6. The method as claimed in claim 5, wherein said looking up correction coefficients corresponding to said first temperature data T1, said second temperature data T2 and said third temperature data TP in a temperature coefficient table further comprises:

7. The method of claim 6, wherein said modifying the correction value in the metering unit according to the correction factor comprises:

8. The method of claim 6, wherein said modifying the correction value in the metering unit according to the correction factor comprises:

9. The method of claim 6, wherein said modifying the correction value in the metering unit according to the correction factor comprises:

10. The method of claim 1, further comprising:

the metering unit acquires metering data output by the metering module;

11. The method of claim 10, wherein:

the metering module comprises a primary side metering module and a secondary side metering module;

the secondary side metering module collects a voltage signal, processes a current signal and the collected voltage signal which are obtained from the primary side metering module, and outputs the processed current signal, the processed voltage signal and a phase difference signal of current and voltage to the metering unit;

12. The method of claim 11, wherein:

the primary side current transformer is located in the primary side metering module, the secondary side combined transformer and the secondary side level matching resistance network are located in the secondary side metering module, and the secondary side combined transformer comprises a secondary side current transformer and a secondary side voltage transformer.

13. The method of claim 1, further comprising:

14. The utility model provides a temperature-compensated equipment of electric energy measurement which characterized in that, temperature-compensated equipment includes primary side current transformer, secondary side combined transformer and secondary side level matching resistance network, temperature-compensated equipment still includes:

15. The apparatus of claim 14, wherein the treatment appliance is configured to:

16. The apparatus of claim 14, wherein the treatment appliance is configured to:

17. The apparatus of claim 16, wherein the treatment appliance is configured to:

and searching a current change value KI11 and a current phase difference JI11 corresponding to the first temperature data T1 and a current change value KI1 and a current phase difference JI1 corresponding to normal temperature data in a first temperature coefficient table of the primary side current transformer.

18. The apparatus of claim 17, wherein the treatment appliance is configured to:

19. The apparatus of claim 18, wherein the treatment appliance is configured to:

20. The apparatus of claim 19, wherein the treatment appliance is configured to:

21. The apparatus of claim 19, wherein the treatment appliance is configured to:

22. The apparatus of claim 19, wherein the treatment appliance is configured to:

23. The apparatus of claim 14, further comprising a metering module, the metering unit configured to:

acquiring metering data output by the metering module;

24. The apparatus of claim 23 wherein the metering modules comprise a primary-side metering module and a secondary-side metering module;

25. The apparatus of claim 24,

the primary side metering module comprises the primary side current transformer and the first temperature sensor;

26. The apparatus of claim 14, wherein the first temperature sensor is configured to measure a temperature of magnetic material of the primary-side current transformer and/or the second temperature sensor is configured to measure a temperature of magnetic material of the secondary-side combined transformer.

27. The temperature compensation device for electric energy metering of claim 14, wherein the secondary side metering module further comprises a wireless transmission unit, the wireless transmission unit is connected with the processor, and the wireless transmission unit is configured to wirelessly communicate with the first temperature sensor and transmit the received first temperature data sent by the first temperature sensor to the processor.

28. An electric energy metering device is characterized by comprising a memory and a processor; wherein the memory is to store one or more computer instructions, wherein the one or more computer instructions are to be executed by the processor to implement the method steps of any one of claims 1-13.

29. A computer-readable storage medium having stored thereon computer instructions, characterized in that the computer instructions, when executed by a processor, carry out the method steps of any of claims 1-13.