CN116577721A - Electric quantity metering method and device for three-phase three-wire electric energy meter - Google Patents

Abstract

The application provides an electric quantity measuring method and device of a three-phase three-wire electric energy meter, and relates to the technical field of electric measurement. The method comprises the following steps: periodically sampling voltage loop data from a metering unit of a target electric energy meter, wherein the target electric energy meter is a three-phase three-wire electronic electric energy meter; under the condition that the abnormal phase voltage of the voltage loop is determined according to the voltage loop data, the value of the constant of the electric energy meter is adjusted to be a correction value, so that the influence of the abnormal phase voltage of the voltage loop on the electricity consumption metering process of the electric energy meter is reduced; according to the correction value of the electric energy meter constant, the frequency value of the pulse output frequency of the target electric energy meter is adjusted from the frequency value of the current period to the correction frequency value, and the electricity consumption of the next period is determined by utilizing the correction frequency value of the pulse output frequency, so that the online compensation of electricity metering after the occurrence of abnormality is detected can be realized, and the method is simple and convenient, has high efficiency, and can solve the technical problem of lower electricity larceny prevention treatment efficiency in the prior art.

Description

Electric quantity metering method and device for three-phase three-wire electric energy meter

Technical Field

The application relates to the technical field of electric metering, in particular to an electric metering method and device for a three-phase three-wire electric energy meter.

Background

Electricity theft and anti-theft are a pair of contradictions between the power supply enterprises and the electricity theft users. For the benefit of electricity stealing users, the electric energy meter charging device is misaligned (less in electric quantity) by technical means (usually, the electric energy meter voltage loop is used as hands and feet) so as to achieve the purpose of less electricity consumption and money. In order to prevent asset loss and protect the interests of the enterprises, the power supply enterprises organize special electricity utilization monitoring personnel to check electricity theft. And put into a system (a marketing business application system, an electric quantity acquisition system, an electricity management terminal, a service complaint platform and the like) for supporting, so as to discover the suspected electricity-stealing user as quickly as possible. After the suspected electricity stealing user is found, the electricity stealing suspected user is manually subjected to field investigation, evidence is obtained, the lost electricity quantity is estimated, the electricity stealing behavior is prevented from continuing, and the stolen electricity quantity is recovered according to the regulations.

At present, the method for searching the suspected electricity larceny user by the national power enterprises basically adopts the following procedures: 1) Acquiring electricity larceny information (report, terminal alarm, electricity management system data, business analysis data and the like) of a user, checking related data (confirmation of electricity larceny suspicion), and then issuing an electricity consumption monitoring investigation summons; 2) Monitoring electricity consumption, searching and analyzing abnormal conditions on site; 3) Finding out abnormality and evidence, further determining that electricity stealing behavior exists, and giving out order to terminate the electricity stealing behavior; 4) Referring to the related data on site, estimating electricity loss quantity of electricity larceny, and issuing a report of electricity larceny punishment; 5) The lost funds are recovered and the funds are paid out.

All the steps 1 to 4 are manual intervention, at least 3 to 7 working days are needed, and the electricity larceny event is manually checked, so that the efficiency is low (the loss can be recovered to the calculated high efficiency in 7 working days), the cost is high (the labor cost, the system construction cost, the system maintenance cost and the like), and the coverage is low (due to the resource limitation, only large users can be considered at present, and all power users cannot be popularized). The electricity consumed by the electricity stealing users is estimated manually, and the deviation between the electricity stealing users and the true value has serious uncertainty, which prevents the accuracy, the lack of fairness, fairness and transparency of trade settlement.

At present, no technical scheme is known about directly supplementing the electric quantity stolen by an electricity stealing user, such as a patent CN106156269A (an online monitoring method for accurately positioning the electricity stealing), which utilizes the electricity consumption data rule of the known electricity stealing user to establish a model and an abnormal screening rule about line loss abnormal indexes, electricity consumption abnormal indexes, metering device faults and abnormal alarm indexes, user historical service handling condition indexes, user historical electricity consumption service indexes and electricity price execution indexes, and uses a marketing service application system, an electric quantity acquisition system, telephone service complaints and customer base file information as customer data sources to monitor the electricity stealing suspected user in real time. The method is to list suspicious households by means of electricity larceny report and network information (such as electricity management terminal alarm), to perform key monitoring, to join operation parameters, history files and other data, and to send personnel to check, evidence, estimate electricity larceny amount, terminate electricity larceny behavior and the like on site basically after actual use (the whole process can only be monitored, cannot be prevented, and more importantly, loss is recovered). This period of time is to let the user continue to steal electricity until the person concerned goes to the site to get evidence, and the theft cannot be terminated. More speaking, the method directly recovers the electric quantity stolen by the user (a large amount of work is also needed), is the combination of the system and the manual processing, only finds, confirms and prevents (a large amount of time delay exists), and cannot realize loss recovery.

For another example, in CN112710884a (an anti-electricity-theft tool and method), a standard meter is connected in series to the loop of the electric energy metering device of the suspected electricity-theft user, the user charging device is checked, the data deviation is found to be large, and the suspected electricity-theft is judged to be similar to the on-site verification mode of an electric power enterprise, except that the method is a targeted action and has the function of evidence collection. It can also be implemented by other people to provide electricity stealing information. The function of directly recovering the electric quantity stolen by the user is not provided. In particular, the amount of electricity stolen is also estimated manually, and still cannot be measured by an electric energy meter.

Disclosure of Invention

The embodiment of the application aims to provide an electric quantity measuring method and device for a three-phase three-wire electric energy meter, which are used for solving the technical problem of low anti-electricity-theft treatment efficiency in the prior art.

In a first aspect, the present application provides a method for measuring electric quantity of a three-phase three-wire electric energy meter, including: periodically sampling voltage loop data from a metering unit of a target electric energy meter, wherein the target electric energy meter is a three-phase three-wire electronic electric energy meter, an initial value of an electric energy meter constant of the target electric energy meter is a calibration value, and the calibration value is used for metering electricity consumption under the condition that a voltage loop of the target electric energy meter is normal; under the condition that the abnormal phase voltage of the voltage loop is determined according to the voltage loop data, the value of the electric energy meter constant is adjusted to be a correction value, wherein the correction value is used for reducing the influence of the abnormal phase voltage of the voltage loop on the electricity consumption metering process of the electric energy meter; according to the correction value of the electric energy meter constant, the frequency value of the pulse output frequency of the target electric energy meter is adjusted from the frequency value of the current period to the correction frequency value, and the power consumption of the next period is determined by utilizing the correction frequency value of the pulse output frequency.

In a second aspect, the present invention also provides an electric quantity measuring device of a three-phase three-wire electric energy meter, including: the sampling module is used for periodically sampling voltage loop data from a metering unit of the target electric energy meter, wherein the target electric energy meter is a three-phase three-wire electronic electric energy meter, an initial value of an electric energy meter constant of the target electric energy meter is a calibration value, and the calibration value is used for metering electricity consumption under the condition that a voltage loop of the target electric energy meter is normal; the correction module is used for adjusting the value of the electric energy meter constant to a correction value under the condition that the phase voltage of the voltage loop is abnormal according to the voltage loop data, wherein the correction value is used for reducing the influence of the phase voltage abnormality of the voltage loop on the electricity consumption metering process of the electric energy meter; the compensation module is used for adjusting the frequency value of the pulse output frequency of the target electric energy meter from the frequency value of the current period to the correction frequency value according to the correction value of the electric energy meter constant, and determining the electricity consumption of the next period by utilizing the correction frequency value of the pulse output frequency.

In a third aspect, the present invention provides an electronic device, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor performing the method described above by the computer program.

In a fourth aspect, the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method of any of the above embodiments.

The invention provides an electric quantity measuring method and device of a three-phase three-wire electric energy meter, which are characterized in that voltage loop data are periodically sampled from a measuring unit of a target electric energy meter, and under the condition that the abnormal phase voltage of a voltage loop is determined according to the voltage loop data, the numerical value of an electric energy meter constant is adjusted to be a correction numerical value, and the correction numerical value is used for reducing the influence of the abnormal phase voltage of the voltage loop on the electric energy meter during the electricity consumption measuring process; according to the correction value of the electric energy meter constant, the frequency value of the pulse output frequency of the target electric energy meter is adjusted from the frequency value of the current period to the correction frequency value, and the electricity consumption of the next period is determined by utilizing the correction frequency value of the pulse output frequency, so that the online compensation of electricity metering after the occurrence of abnormality is detected can be realized, and the method is simple and convenient, has high efficiency, and can solve the technical problem of lower electricity larceny prevention treatment efficiency in the prior art.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an example electronic device for implementing a method of power metering for a three-phase three-wire electric energy meter in accordance with an embodiment of the present application;

FIG. 2 is a flow chart of a method of power metering for a three-phase three-wire electric energy meter according to an embodiment of the application;

FIG. 3 is a schematic diagram of another power metering scheme for a three-phase three-wire electric energy meter according to an embodiment of the present application;

fig. 4 is a schematic diagram of a phase voltage loss principle of a three-phase three-wire electric energy meter according to an embodiment of the present application;

fig. 5 is a schematic diagram of an electric quantity measuring device of a three-phase three-wire electric energy meter according to an embodiment of the present application;

FIG. 6 is a vector diagram of a reverse voltage phase sequence according to an embodiment of the present application;

FIG. 7 is a vector diagram of a reverse voltage phase sequence according to an embodiment of the present application;

FIG. 8 is a vector diagram of a reverse voltage phase sequence according to an embodiment of the present invention;

FIG. 9 is a vector diagram of single-phase voltage loss according to an embodiment of the present invention;

fig. 10 is a schematic diagram of a billing electric energy meter according to an embodiment of the present invention.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

Some embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.

First, an example electronic device 100 for implementing a power metering method of a three-phase three-wire electric energy meter according to an embodiment of the present invention is described with reference to fig. 1.

As shown in fig. 1, electronic device 100 includes one or more processors 102, one or more memories 104, and optionally electronic device 100 may also include input devices 106 and output devices 108, which are interconnected by a bus system 112 and/or other forms of connection mechanisms (not shown in fig. 1). It should be noted that the components and structures of the electronic device 100 shown in fig. 1 are exemplary only and not limiting, as electronic devices may have other components and structures as desired.

The processor 102 may be a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), or other form of processing unit having data processing capabilities and/or instruction execution capabilities, and may control other components in the electronic device 100 to perform desired functions.

Memory 104 may include one or more computer program products that may include various forms of computer-readable storage media, such as volatile memory and/or non-volatile memory. Volatile memory can include, for example, random Access Memory (RAM) and/or cache memory (cache) and the like. The non-volatile memory may include, for example, read Only Memory (ROM), hard disk, flash memory, and the like. One or more computer program instructions may be stored on a computer readable storage medium and executed by the processor 102 to implement client functionality and/or other desired functionality in embodiments of the present invention described below. Various applications and various data, such as various data used and/or generated by the applications, may also be stored in the computer readable storage medium.

The input device 106 may be a device used by a user to input instructions and may include one or more of a keyboard, mouse, microphone, touch screen, and the like.

The output device 108 may output various information (e.g., images or sounds, etc.) to the outside (e.g., a user, other electronic equipment, etc.), and may include one or more of a display, speakers, etc.

For example, an example electronic device for implementing a method of power metering for a three-phase three-wire electric energy meter according to an embodiment of the application may be implemented on an intelligent electric energy meter such as a three-phase three-wire electronic electric energy meter.

According to an embodiment of the present application, there is provided an embodiment of a method of power metering of a three-phase three-wire electric energy meter, it being noted that the steps illustrated in the flowchart of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical sequence is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in a different order than that herein. When it should be noted, the part numbers of the present application are not coded sequentially, so as to match with the conventional labeling of electricians, such as U1, U3, etc.

Fig. 2 is a flowchart of a method for measuring electric quantity of a three-phase three-wire electric energy meter according to an embodiment of the present invention, as shown in fig. 2, the method includes the following steps:

s210, periodically sampling voltage loop data from a metering unit of a target electric energy meter, wherein the target electric energy meter is a three-phase three-wire electronic electric energy meter, an initial value of an electric energy meter constant of the target electric energy meter is a calibration value, and the calibration value is used for metering electricity consumption under the condition that a voltage loop of the target electric energy meter is normal.

In a three-phase power supply system, three phases are respectively an A phase (i.e. a U phase), a B phase (i.e. a V phase) and a C phase (i.e. a W phase) in sequence, wherein the voltage of each phase is called a phase voltage, and the current flowing through each phase is called a phase current; the voltage between the line ends of each transmission line is called line voltage, and the current flowing through the transmission line is called line current; Φ represents the angle between vector U and vector I.

The metering unit of the electronic electric energy meter is composed of two groups of elements, namely two groups of current sampling devices (such as mutual inductors), and the voltage loop can be understood as an A mutual sensor loop and a C mutual sensor loop. The electronic power meter may periodically sample circuit data of the voltage loop of the power meter, for example, three times per second.

In the step S210, the periodically sampled voltage loop data may include:

the voltage of each mutual inductor loop (such as the line voltage U1 of the A mutual inductor loop and the line voltage U3 of the C mutual inductor loop);

the current of each phase transformer loop (such as phase current Ia of the a-phase mutual inductor loop, phase current Ic of the C-phase mutual inductor loop);

the phase angle of each phase transformer loop (i.e. the included angle between the voltage and the current of the transformer loop, such as the phase angle phi 1 of the phase transformer loop A, the phase angle phi 3 of the mutual inductor loop C);

active power of each mutual inductor loop (e.g., active power W1 of the a mutual inductor loop, active power W3 of the C mutual inductor loop);

three-phase voltage vector sum Is a three-phase voltage vector sum (can be actually read directly from a metering register of a metering chip); />And each represents a vector value of each phase voltage in the three phases. For example, the CPU in the electric energy meter starts the CPU to read the current U, I, W, phi and other data of the metering module according to the data read-write cycle (3 times/second) of the metering module (RN 2026) and writes the additional dataAnd (3) immediately starting an electric quantity supplementing program when an abnormality is found, and performing corresponding operation.

The CPU stores various data acquired in the metering module in an additional database for calling in an execution program, the format and the address of the database are shown in the following table 1, and the table 1 is the content and the address of the additional database.

TABLE 1

S220, when the abnormal phase voltage of the voltage loop is determined according to the voltage loop data, the value of the electric energy meter constant is adjusted to be a correction value, and the correction value is used for reducing the influence of the abnormal phase voltage of the voltage loop on the electricity consumption metering process of the electric energy meter.

When determining whether the phase voltage of the voltage loop is abnormal according to the voltage loop data, the phase voltage of the measuring unit can be calculated according to the comparison result between the line voltage U1 of the A-phase sensor loop and the reference voltage, the comparison result between the line voltage U3 of the C-phase sensor loop and the reference voltage, and the three-phase voltage vector sum of the measuring unitAnd determining whether the phase voltage of the voltage loop is abnormal (such as reverse phase sequence, A phase voltage loss, B phase voltage loss, C phase voltage loss and two phase voltage loss) according to the comparison result between the phase angle phi U of the mutual sensor loop A and the mutual sensor loop C and the reference angle. The method specifically comprises the following cases:

1) Line voltage U1 of the A mutual inductor loop is larger than or equal to reference voltage (such as 100V), line voltage U3 of the C mutual inductor loop is larger than or equal to reference voltage, and three-phase voltage vector sum of the metering unitsUnder the conditions that the voltage is larger than or equal to a reference voltage vector (20V for example) and the phase angle phi U is equal to a first reference angle (60 degrees for example), determining that the voltage loop is normal;

2) Mutual inductor ALine voltage U1 of the loop is greater than or equal to reference voltage, line voltage U3 of the C mutual inductor loop is greater than or equal to reference voltage, and three-phase voltage vector sum of the metering unitsUnder the condition that the voltage vector is larger than or equal to a reference voltage vector and the phase angle phi U is equal to a second reference angle (such as 60 degrees), determining that the voltage loop is in an inverse phase sequence, wherein the sum of the second reference angle and the first reference angle is 0;

3) Line voltage U1 of the A mutual inductor loop is smaller than reference voltage, line voltage U3 of the C mutual inductor loop is larger than or equal to reference voltage, and three-phase voltage vector sum of the metering unitsUnder the conditions that the voltage vector is larger than or equal to the reference voltage vector and the phase angle phi U is not equal to the first reference angle or the second reference angle, determining that the voltage loop is in phase A voltage loss;

4) Line voltage U1 of the A mutual inductor loop is smaller than the reference voltage, line voltage U3 of the C mutual inductor loop is smaller than the reference voltage, and the three-phase voltage vector sum of the metering unitsUnder the conditions that the voltage vector is larger than or equal to the reference voltage vector and the phase angle phi U is not equal to the first reference angle or the second reference angle, determining that the voltage loop is in phase B voltage loss;

5) Line voltage U1 of the A mutual inductor loop is larger than or equal to reference voltage, line voltage U3 of the C mutual inductor loop is smaller than reference voltage, and three-phase voltage vector sum of the metering units Under the conditions that the voltage vector is larger than or equal to the reference voltage vector and the phase angle phi U is not equal to the first reference angle or the second reference angle, determining that the voltage loop is in phase C voltage loss;

6) Line voltage U1 of the A mutual inductor loop is smaller than the reference voltage, line voltage U3 of the C mutual inductor loop is smaller than the reference voltage, and the three-phase voltage vector sum of the metering unitsAnd under the condition that the phase angle phi U is smaller than the reference voltage vector and is not equal to the first reference angle or the second reference angle, determining that the voltage loop is two-phase voltage loss.

In an alternative embodiment, the voltage loop check "abnormal state" logic decision criteria are shown in Table 2:

TABLE 2

The logic code is divided into line voltage U1 (namely Uab) of A-phase mutual inductor loop, line voltage U3 (namely Ucb) of C-phase mutual inductor loop, three-phase voltage vector sumPhase angle phi U.

When the line voltage Uab between the A phase and the B phase is more than or equal to 40V, outputting a code '1', and when the line voltage Uab between the A phase and the B phase is less than 40V, outputting a code '0';

outputting a code '1' when the line voltage Ucb between the C phase and the B phase is greater than or equal to 40V, and outputting a code '0' when the line voltage Ucb between the C phase and the B phase is less than 40V;

outputting a code '1' when the three-phase voltage vector sum is more than or equal to 20V, and outputting a code '0' when the three-phase voltage vector sum is less than 20V;

When the line voltage included angle (phi U) is-60 degrees and the phase sequence prompt voltage is normal (UPhSqErr=0), the code '1' is output, when the line voltage included angle (phi U) is 60 degrees and the voltage phase sequence prompt is abnormal (UPhSqErr=1), the code '0' is output, and when the line voltage included angle (phi U) is not 60 degrees or-60 degrees or the voltage phase sequence is not abnormal, the code 'Er' is output.

Wherein, if the output is completely encoded as '1101', the voltage is normal; if the output is completely encoded as '1100', the voltage phase sequence is abnormal; if the output complete code is '011 Er', the phase A is out of voltage; if the output complete code is "001Er", the B phase is out of voltage; if the output complete code is '101 Er', the phase C is out of voltage; if the output is fully encoded as "000Er", then two of the three phases are out of voltage. And then, determining a correction value of the constant of the electric energy meter according to the abnormal type so as to partially or completely eliminate the influence of the phase voltage abnormality generated by the voltage loop on the electricity consumption metering process of the electric energy meter by using the correction value.

The accuracy of the "lost charge" compensation depends on the ammeter constant (K). When the voltage loop is abnormal, the logic judgment unit gives the current abnormal content. Aiming at various 'abnormity', the application researches different ammeter constant (K) calculation formulas, and obtains the ammeter constant (K) value which should be set currently according to the calculation formulas, thereby ensuring that the ammeter is still correctly metered under the 'abnormal state'.

Under the state of voltage loss, the three-phase three-wire electric energy meter has the following formula:

after simplification, new ammeter constants:

the three-phase electric energy meter has the characteristics of voltage reverse phase sequence and the difficulty of electric quantity additional compensation:

the first and the reverse voltage phase sequences can be divided into the following modes in a voltage sequencing manner: uacb, ubac, ucba, the metering module outputs power w=0, regardless of the voltage ordering. In a 3 x 3 system (three-phase three-wire wiring system), the Uacb ordering is taken as an example:

W＝W1+W3＝UI×Cos(Φ-30°)+UI×Cos(Φ+150°)＝0；

the second, voltage reverse phase sequence is actually two-phase voltage position exchange (one phase is unchanged), in order to make the electric energy meter measure correctly, firstly judge the ordering mode of the current voltage vector, then restore the reverse phase sequence into the positive phase sequence according to the voltage symmetry and current balance principle of the 3 x 3 system:

the "virtual power" in the "normal phase sequence" (the total power w=0 output by the metering module, and no accurate data can be provided) "is calculated, and the calculation formula of the new ammeter constant (K) in the" reverse phase sequence state "is deduced.

Thirdly, calculating an ammeter constant (K) of the three-phase three-wire ammeter under a voltage reverse phase sequence state:

wherein: s1 represents the apparent power of the A-phase transformer loop, wherein the apparent power (standard definition, unit is kvar) is the volume of the AC electrical equipment, is equal to the product of a voltage effective value and a current effective value, and is multiplied by the power factor to be equal to the active power, and the unit is volt-ampere (var) and kilovolt-ampere (kvar);

K represents a nameplate parameter value (namely an initial value and a calibration value of a constant of the electric energy meter) of the electric energy meter, and K represents a new electric energy meter constant value (namely a correction value) set in an inverse phase sequence state;

phi represents a virtual power factor angle (in a voltage reverse phase sequence state, the current voltage sequencing mode can be judged according to the characteristics of parameters such as apparent power value, active power, voltage, current and the like of each element output by a current metering module, so that an actual power factor angle is calculated, because the metering module cannot accurately reflect the power factor angle (caused by the voltage reverse phase sequence), the calculated phi angle, the power of an A-phase transformer loop and the like, the method is characterized in that the method uses a virtual dead word together and is distinguished from information directly output by the metering module);

w represents a power value (1 kW) under the regulation of an ammeter constant;

w' represents the virtual power during the reverse phase sequence of the voltage.

The principle of the metering module is that the output pulse quantity is determined by the magnitude of an ammeter constant (K) at constant power and fixed time intervals. The electric quantity is the integral value of the pulse, so that the value of the electric quantity output by the metering module can be determined by grasping the calculated value of the electric meter constant (K).

Referring to fig. 3, after the logic judgment of the measurement and logic judgment unit, different additional electricity calculation formulas are selected according to different abnormal states, and are input into the metering module to perform online additional for lost electricity.

Specifically, firstly determining the voltage loss and the negative phase sequence prompt of the voltage of the metering module, reading the voltage, the current, the phase angle, the power, the three-phase voltage vector sum and the like of each element, and carrying out logic judgment and logic judgment results based on the results shown in the table 2.

If the result is 1101, confirming that the voltage loop is abnormal and normal metering;

if the result is 1100, judging the voltage sequence of the reverse phase sequence, and carrying out the electric quantity compensation lost by the reverse phase sequence;

if the result is "011Er", determining that the phase A is out of voltage, and carrying out missing electric quantity compensation;

if the result is "001Er", judging whether U1 and U3 are larger than 20V (or U1-U3=0+ -0.1V), if so, determining that the B phase is out of voltage, and carrying out missing electric quantity compensation; if not, the full voltage-loss electric quantity is supplemented.

If the B phase is out of voltage, the AC phase voltage distribution principle is related to the impedance of the U1 and U3. If the impedances are balanced, the AC phase voltage is split into two halves, each accounting for 50%. When a certain phase is often heavier, the residual pressure is relatively low, but not more than 5% of the threshold, and the principle is shown in fig. 4.

If the result is '101 Er', the phase C is determined to be out of voltage, and missing electric quantity compensation is carried out.

Wherein 1101: the voltage loop is normally wired and normally metered;

1100: the reverse phase sequence wiring is carried out, the electric quantity losing mode of the reverse phase sequence is carried out, the calculation of a new electric meter constant K value under the state of the reverse phase sequence is completed (the description of the characteristics of the three-phase three-wire electric energy meter under the state of the reverse voltage phase sequence, the difficulty of electric quantity supplementing and the electric meter constant K calculation formula are described, and the electric quantity losing mode under the state of the reverse phase sequence can be completed);

011Er: the phase A is in voltage loss (can be 0111 or 0110), the voltage loss and electric quantity loss modes are supplemented, the calculation of a new electric meter constant K value under the phase A voltage loss state is completed (the three-phase three-wire electric meter is in the voltage loss state and the electric meter constant K calculation formula is described above), and the additional supplement of the electric quantity loss under the reverse phase sequence state can be completed;

001Er: whether the AC phase voltage is larger than 20V (or U1-U3 = 0 +/-0.1V), if so, the B phase voltage is lost (0011 or 0010), and the lost electric quantity tracking mode is the same as the 'A phase voltage loss'; if not, the whole is in pressure loss.

101Er: the phase C loses voltage (1011 or 1010), and the lost electric quantity is the same as the phase A loses voltage.

The specific electricity consumption compensation method may be referred to the description in the embodiment of fig. 2, and will not be repeated here.

S230, according to the correction value of the electric energy meter constant, the frequency value of the pulse output frequency of the target electric energy meter is adjusted from the frequency value of the current period to the correction frequency value, and the power consumption of the next period is determined by utilizing the correction frequency value of the pulse output frequency.

Based on the principle of an electronic electric energy meter, the quantity of output electric quantity pulses depends on the magnitude of an electric energy meter constant K. The smaller the K is (under the premise of unchanged input power of the electric energy meter), the more the output electric quantity pulse is, namely the more the electric quantity metered by the electric energy meter can be changed by changing the electric energy meter constant K. No matter the voltage is lost (voltage is lost) or the voltage is in reverse phase sequence, the power input into the electric energy meter is reduced (caused by the abnormality of the voltage loop), the correct electric energy meter constant is calculated, the electric energy meter constant is written into a power threshold register of the metering chip, and the lost electric quantity of the voltage loop is recovered by adjusting the pulse output speed of the electric energy meter.

The total power (abnormal voltage lost power + power recorded by the normal phase) is determined based on the normal phase power and the lost power.

For example, the phase A loses pressure, the phase BC is a normal phase, and the phase A is an abnormal phase;

the phase B is out of voltage, the AC phase is a normal phase, and the phase B is an abnormal phase;

the phase C is out of pressure, the phase AB is the normal phase, and the phase C is the abnormal phase;

For the normal phase, the metering chip outputs electric quantity pulses according to accurate values all the time, the software only needs to calculate the normal phase electric quantity value according to the number of the output pulses and the nominal pulse constant (the pulse constant calibrated on the nameplate) of the meter, and the software does not need to carry out special treatment on the normal phase.

The principle of obtaining the corrected total electric quantity of the actual three-phase three-wire electric energy meter is that (related to a metering chip):

according to the abnormal type, different pulse constant K values (which are smaller than the K value in normal wiring) are obtained through calculation, the power threshold value register value of the record chip is automatically switched and modified (namely, the K value is written into the register, the general register value is reduced), the number of pulses output by the metering chip in unit time is increased along with the reduction of the power threshold value register value, and according to the metering principle, the final electric quantity value (the normal phase electric quantity and the abnormal phase electric quantity) can be obtained according to the number of pulses and the electric meter pulse constant calibrated by the nameplate, for example: the pulse constant of nameplate calibration is 10000imp/kWh, the actual output pulse number is 25000, and the final metered electric quantity is 2.5kWh.

The principle of the metering module is that the output pulse quantity is determined by the magnitude of an ammeter constant (K) at constant power and fixed time intervals. The electric quantity is the integral value of the pulse, so that the value of the electric quantity output by the metering module can be determined by grasping the calculated value of the electric meter constant (K).

Based on the principle of a metering module, after a new ammeter constant K value is obtained and written into a metering chip power threshold register, the output pulse speed of the ammeter is changed along with the new ammeter constant K value, and the metered electric quantity in unit time is changed along with the new ammeter constant K value, so that the aim of online additional compensation is fulfilled.

Fig. 5 is a schematic diagram of an electric quantity measuring device of a three-phase three-wire electric energy meter according to an embodiment of the present invention. As shown in fig. 5, the apparatus includes:

the sampling module 510 is configured to periodically sample voltage loop data from a metering unit of a target electric energy meter, where the target electric energy meter is a three-phase three-wire electronic electric energy meter, an initial value of an electric energy meter constant of the target electric energy meter is a calibration value, and the calibration value is used to meter electricity consumption under a condition that a voltage loop of the target electric energy meter is normal;

the correction module 520 is configured to adjust a value of the electric energy meter constant to a correction value when it is determined that the phase voltage of the voltage loop is abnormal according to the voltage loop data, where the correction value is used to reduce an influence of the phase voltage abnormality of the voltage loop on a power consumption metering process of the electric energy meter;

the compensation module 530 is configured to adjust a frequency value of the pulse output frequency of the target electric energy meter from a frequency value of a current period to a correction frequency value according to the correction value of the electric energy meter constant, and determine the power consumption of the next period by using the correction frequency value of the pulse output frequency.

Optionally, the metering unit includes an a-phase transformer loop and a C-phase mutual inductor loop, wherein the sampling module 510 is further configured to: periodically sampling line voltage U1 of the A-phase mutual inductor loop and line voltage U3 of the C-phase mutual inductor loop; periodically sampling the phase angle phi 1 of the A-phase mutual inductor loop and the phase angle phi 3 of the C-phase mutual inductor loop; periodically sampling the three-phase voltage vector sum of the metering units

Optionally, the sampling module 510 is further configured to: voltage loop data is sampled from the meter unit of the target power meter at a frequency of 3 times per second.

Optionally, the correction module 520 is further configured to: according to the comparison result between the line voltage U1 of the A mutual inductor circuit and the reference voltage, the comparison result between the line voltage U3 of the C mutual inductor circuit and the reference voltage, and the three-phase voltage vector sum of the metering unitAnd determining whether the phase voltage of the voltage loop is abnormal or not according to the comparison result between the phase angle phi U of the mutual sensor loop A and the mutual sensor loop C and the reference angle with the reference voltage vector.

Optionally, the phase voltage anomalies of the voltage loop include reverse phase sequence, a phase voltage loss, B phase voltage loss, C phase voltage loss, and two phase voltage loss.

Optionally, the correction module 520 is further configured to:

Line voltage U1 of the A mutual inductor loop is larger than or equal to reference voltage, line voltage U3 of the C mutual inductor loop is larger than or equal to reference voltage, and three-phase voltage vector sum of a metering unitUnder the condition that the voltage vector is larger than or equal to the reference voltage vector and the phase angle included angle phi U is equal to the first reference included angle, determining that the voltage loop is normal;

line voltage U1 of the A mutual inductor loop is larger than or equal to reference voltage, line voltage U3 of the C mutual inductor loop is larger than or equal to reference voltage, and three-phase voltage vector sum of a metering unitUnder the condition that the voltage vector is larger than or equal to a reference voltage vector and the phase angle phi U is equal to a second reference angle, determining that the voltage loop is in an inverse phase sequence, wherein the sum of the second reference angle and the first reference angle is 0;

line voltage U1 of the A mutual inductor loop is smaller than reference voltage, line voltage U3 of the C mutual inductor loop is larger than or equal to reference voltage, and three-phase voltage vector sum of the metering unitsUnder the conditions that the voltage vector is larger than or equal to the reference voltage vector and the phase angle phi U is not equal to the first reference angle or the second reference angle, determining that the voltage loop is in phase A voltage loss;

line voltage U1 of the A mutual inductor loop is smaller than the reference voltage, line voltage U3 of the C mutual inductor loop is smaller than the reference voltage, and the three-phase voltage vector sum of the metering units Under the conditions that the voltage vector is larger than or equal to the reference voltage vector and the phase angle phi U is not equal to the first reference angle or the second reference angle, determining that the voltage loop is in phase B voltage loss;

line voltage U1 of the A mutual inductor loop is larger than or equal to reference voltage, line voltage U3 of the C mutual inductor loop is smaller than reference voltage, and three-phase voltage vector sum of the metering unitsUnder the conditions that the voltage vector is larger than or equal to the reference voltage vector and the phase angle phi U is not equal to the first reference angle or the second reference angle, determining that the voltage loop is in phase C voltage loss;

line voltage U1 of the A mutual inductor loop is smaller than the reference voltage, line voltage U3 of the C mutual inductor loop is smaller than the reference voltage, and the three-phase voltage vector sum of the metering unitsAnd under the condition that the phase angle phi U is smaller than the reference voltage vector and is not equal to the first reference angle or the second reference angle, determining that the voltage loop is two-phase voltage loss.

Optionally, the compensation module 530 is further configured to:

under the condition that the phase voltage loss of the voltage loop is determined according to the voltage loop data, the correction value K of the electric energy meter constant is determined and adjusted according to the following formula:

wherein k is a calibration value, and phi is a phase angle;

under the condition that the reverse phase sequence of the voltage loop is determined according to the voltage loop data, the correction value of the electric energy meter constant is determined and adjusted according to the following formula:

Where W' is the virtual power during the reverse phase sequence and W is the power before adjustment.

The device provided by the embodiment of the present application has the same implementation principle and technical effects as those of the foregoing method embodiment, and for the sake of brevity, reference may be made to the corresponding content in the foregoing method embodiment where the device embodiment is not mentioned.

As an alternative embodiment, the following details of the technical solution of the present application are described in detail in conjunction with the detailed description below:

the voltage reverse phase sequence (Uacb) vector diagram is shown in fig. 6, the voltage reverse phase sequence (Ubac) vector diagram is shown in fig. 7, and the voltage reverse phase sequence (Ucba) vector diagram is shown in fig. 8, and it can be seen from fig. 6 to fig. 8: when the voltage is in the reverse phase sequence, no matter how the voltage vectors are ordered (Uacb, ubac, ucba), the total output active power of the electric energy meter is zero; in order to make the figures 6-8 look clearer, the angle Φ is plotted at 0 °.

According to relevant regulations, the high-voltage power supply network supply voltage qualification standard is: u±10% Un (Un is the rated voltage). And when the power supply voltage U is more than 1.1Un or U is less than 0.9Un, the power supply voltage U is in an abnormal state. The voltage fluctuation of the power grid does not exceed the limit (i.e., the voltage threshold) under normal operation.

Uncertainty about "voltage threshold":

(1) The voltage abnormality information is judged by "logic". Decision criterion 4: the three-phase voltage vector sum (ΣU), the included angle (phi U) between the line voltages and the negative phase sequence prompt signals output by the chip are respectively the first element voltage (line voltage U1), the third element voltage (line voltage U3), the three-phase voltage vector sum (ΣU);

(2) the threshold value (two terms) of the line voltage is (U1 or U3), U1 or U3 is more than or equal to 40V and is logic '1', the sum threshold value (sigma U) of the three-phase voltage vector is 20V, and sigma U is more than or equal to 20V; logic "1";

the included angle between line voltages- & gt phi U (phi U- & gt the included angle between U1U3 = -60 DEG) and the opposite phase sequence prompt (UPhSqErr=0) coexist (are combined into one), and judging logic '1';

included angle between line voltages- & gt phi U (phi U- & gt included angle between U1U3 = +60 DEG) and reverse phase sequence prompt (UPhSqErr=1) exist simultaneously- & gt judgment logic '0'; phi U and the reverse phase sequence prompt, and only one index does not meet the requirement judgment, namely logic '0';

(3) when the B phase is out of voltage, the voltage of the first element and the voltage of the third element are changed to be directly connected between Uac (forming an artificial center point), and if the equivalent impedance of the voltage loops of the first element and the third element is equal. The elements are distributed at 50% voltage (at around 29V). The vector state is detailed in fig. 9;

(4) as can be seen from fig. 9: when A, C phase voltage (Ua or Uc is out of voltage), the amplitude of the three-phase voltage vector sum (ΣU) is equal to the phase voltage (the voltage amplitude of Ua or Uc), and the phase is 180 DEG (U) different from the original voltage. The correctness of the conclusion can also be proved by a complex number calculation method. The "complex" calculation is as follows:

1) The three-phase voltage Ji Quanshi is calculated with the three-phase voltage vector sum (USUM) being zero.

According to the complex algorithm, the three-phase voltages are complete, and the voltage vector sum (Σu) is calculated:

wherein,,

and the operation result is that the vector sum of the three-phase voltages is zero in the state of complete three-phase voltages.

2) When the phase A loses voltage, the complex number of phase A voltage conjugate is calculated:

the amplitude is equal to the phase voltage, the phase difference is 180 degrees, and the conclusion is consistent with the vector diagram.

3) C phase voltage loss, finding the conjugate complex number of C phase voltage

The amplitude is equal to the phase voltage, the phase difference is 180 degrees, and the conclusion is consistent with the vector diagram.

(5) When the B-phase voltage is applied, the electric energy meter operates under a "special" mode of connection (corresponding to bridging the two ends of the line voltage Uac). The line voltage Uac is divided into two and applied to the voltage dividing resistors of the first and third elements of the electric energy meter, respectively, the principle wiring diagram is shown in fig. 10 below.

(6) As can be seen from fig. 10: in general, after the phase B loses voltage, the first element and the third element of the electric energy meter are connected in series (form an artificial center point), and the voltage distribution is distributed according to the internal resistance. In the absence of external devices (voltmeters, voltage monitors), most of them, the voltage drop across the first element and the third element is equal. However, when an external device is present (there is a possibility that the voltage assigned to this phase decreases, and the voltage assigned to the other phase increases, which cannot be ignored.

The abnormal state confirms the difficulty and the processing principle:

difficulty in confirming the loss of pressure:

(1) the three-phase three-wire electric energy meter is a special meter for charging a 35kV and 10kV high-voltage power grid. The 35kV and 10kV high-voltage power networks are neutral point ungrounded systems (no zero line), and the power networks are only introduced by three phase lines (commonly called fire wires Ua, ub and Uc and refer to figure 10). Conventionally, no "phase line anomaly" could be found directly (because there is no neutral line, no direct measurement of the live to neutral voltage);

(2) distinction between normal and abnormal:

the power grid supplies power normally: three-phase voltages are complete and equal in amplitude (ua=ub=uc=un), voltages are arranged in positive phase sequence (Uabc), active power (W), w=uicos Φ, apparent power (S), s=ui; wherein, U: phase voltages (Ua, ub, uc); i: current (Ia, ic);

Φ: an included angle between the voltage and the current; cosΦ: and the cosine function of the phi angle, S, apparent power.

Under normal state, three-phase total active powerThree-phase apparent power->Abnormal state: the two cases are:

firstly, voltage reverse phase sequence, complete three-phase voltage, abnormal voltage sequencing (Uacb, ubac, ucba) and zero total active power of the three phases output by the electric energy meter;

and the second is voltage loss (voltage loss), which is divided into single-phase voltage loss and two-phase voltage loss (total voltage loss). And the electric energy meter outputs three-phase total active power to be reduced ∈.

(3) Difficulty in judging abnormal state:

since the 35kV and 10kV high-voltage networks are neutral points and are not grounded systems (no zero line), and the abnormal state appears on the phase voltage (reverse phase sequence or voltage loss), related information cannot be directly obtained (the voltage of the live wire to the zero line cannot be directly measured), but the abnormal state is reflected on the line voltage, the phase angle and the output total active power.

(4) The skill for solving the difficult point is as follows:

an indirect measuring method is adopted, the three-phase voltage vector sum (Sigma U) is measured, the power factor angle (phi) is measured, and the total active power is output. As they are reflected in the parameters mentioned above. The most effective method is to make "vector diagram" (refer to fig. 6 to 9) according to the "electrotechnical principle" and make logic analysis of multi-parameter state;

(5) logic analysis of multi-parameter states:

the "analysis of logic of multiparameter states" is divided into two parts.

First, the "voltage reverse phase sequence" is judged. Element index 4: line voltage (Uab, ucb are two), three-phase voltage vector sum (Σu), phase angle and reverse phase sequence hint (merging into one term);

in the "voltage reverse phase sequence" state. Three-phase voltage vector sum (Σu), Σu=0, "logic analysis" should be "0".

And secondly, judging the 'decompression'. Element index 3: line voltages (Uab, ucb are two), three-phase voltage vector sum (Σu), phase angle and reverse phase sequence suggest that the device should exit without taking part in judgment. However, since the "reverse phase sequence" and the "voltage loss" are designed in one table in the "logic analysis", the "Err" or the "0"/1 "is used instead in the" voltage loss "judgment, and the" logic analysis "is kept for 4 participation amounts.

(6) Confirmation of abnormal phase:

when the logic analysis code is 1100- & gt, judging the voltage reverse phase sequence;

when the codes in the table 1 appear 011Er (or 0111, 0110) to A phase decompression;

when the codes in the table 1 show 001Er (or 0011, 0010) to B phase decompression;

when the codes in the table 1 appear 101Er (or 1011, 1010) to C phase decompression;

when the codes in table 1 appear 000Er (or 0001, 0000) →two-phase voltage loss (total voltage loss).

Single-phase voltage loss can be converted from the current phase angle (phi 1 or phi 3) of the normal phase provided by the RN2026 chip (the method is analyzed later);

the full-voltage-loss "RN2026 chip" would provide "full-voltage-loss" information and the current value Σi of each phase present, (1 time/min, current measurement time: 88ms integral value).

Difficulties in alternative power selection:

(1) the replacement power must be a "positive value". The "electricity stealing event" occurs (unpredictable) at any time in the range of (-90 ° < Φ < +90°) throughout the operating scene. While "negative power" may often occur "within" an operating scenario, "the task of" replacing power "cannot be completed. The application can only introduce the normal phase active power, apparent power and the like to replace the lost power. At this time, operations such as "phase conversion" and "apparent power conversion" must be performed;

(2) Total active power (W) operation formula:

total active power (W): w=first element power (W1) +third element power (W3).

From the above formula, it can be seen that: the phase difference between phi 1 and phi 3 is 60 degrees, so that the abnormal phase phi angle or the current power factor angle (phi) can be obtained from the normal phase phi angles (phi 1 and phi 3);

(3) active power (W), w=uicos Φ, apparent power (S), s=ui. The phase difference is CosPhi, and the apparent power (S) is converted into the active power (W) only by multiplying the power factor (CosPhi). Thus, the problem of negative power can be effectively solved.

(4) According to the characteristics that a 35kV and 10kV high-voltage power grid is a neutral point insulation system, three-phase voltage is symmetrical (Uab=Ucb) and current is balanced (Ia=ic), normal phase amplitude can directly replace abnormal phase amplitude;

(5) according to the logic judgment coding and phase angle conversion relation, parameters required by 'alternative power' can be conveniently completed.

Regarding the ammeter constant versus output power pulse:

physical meaning of ammeter constant (k): ammeter constant (k) ×standard power (W) =constant (C), i.e.: kxw=c.

The ammeter constant (k) is determined by the W/F converter (power integrator) inside the RN2026 ammeter chip by the "ammeter chip internal parameters". The external inability to change the magnitude of the "ammeter constant (k)" is only followed: ammeter constant (k) ×standard power (W) =constant (C), i.e.: k×w=c to ensure correct metering;

Such as: 3 x 100v 1.5/6A, where k=20000 imp/kWh

According to the physical meaning of the ammeter constant and the instruction of the chip manufacturing user manual, the method can be applied as follows:

the ammeter constant k is: 20000imp/kWh.

That is, if held for a unit time (e.g., t=18 seconds), work is inputThe rate is 1kW and is unchanged, and the electric energy meter outputs 100 electric quantity pulses at 18 seconds (the following calculation formula is deduced according to the electric meter constant principle:

wherein, t: time, unit: second (same below), after calculation, confirm that the "ammeter constant" of the meter is 20000imp/kWh "without errors (this method is typically used in laboratory checking if the ammeter constant is correct→if the manufacturer will put the nameplate wrong).

This method can also be used in the field to check the amount of power currently being input to the meter (the meter-specific loop is not typically equipped with a power meter).

If at t=18 seconds it is detected that the power meter output is 100 pulses, the current input to the power meter is measured to be 1kW, calculated:if it is detected at t=18 seconds that the electric energy meter output is 200 pulses, the current power input to the electric energy meter must be 2kW, and similarly, if it is detected at 18 seconds that the electric energy meter output is 50 pulses, the current power input to the electric energy meter must be 0.5kW.

Under the precondition of unchanged K, the more total electric quantity pulses are output by the electric energy meter in a fixed time (t), which indicates that the current input power is larger.

Application of ammeter constant (k):

(1) ensuring the correct metering condition:

ammeter constant (k) ×input power (W) =constant (C), i.e.: kxw=c.

Such as: 3×100v1.5/6 ak=20000 imp/kWh, under operating conditions the ammeter constant is not set (changed). Whether K is increased or decreased (c+.c after K is varied) will affect the number of power pulse outputs, misaligning the metering.

(2) Setting the ammeter constant result to be used for my:

if in the voltage-losing state, the power input to the electric energy meter is certainly reduced (W ∈). If the ammeter constant K is maintained unchanged, the quantity of electric quantity pulse output is necessarily reduced (W ∈→Pimp ∈).

To compensate for the power drop due to the loss of voltage, it is not desirable (nor practical) to artificially increase the input power. The simplest method is to increase the number of pulses of the output electric quantity of the electric energy meter (the internal parameters of the chip cannot be changed), and the adopted method is to reset the value of the constant K of the electric energy meter so as to increase the number of pulses of the output electric quantity of the electric energy meter in unit time by ∈

Maintaining the product of the ammeter constant and the input power: the relation of K multiplied by W=constant (C) is unchanged, (K multiplied by W=K multiplied by W '. Fwdarw. In the formula, K is the electric energy meter nameplate constant, K is the reset new electric energy meter constant, W is the rule prescribed by nameplate- & gt1 kW, and W' is the actual power of the current electric energy meter), so that the loss caused by W.

(3) k→k conversion relation:

from the calculation formula kxw=kxw', a new ammeter constant (K) is obtained:

further, the present embodiment also provides a computer readable storage medium, on which a computer program is stored, which when being executed by a processor, performs the steps of the method provided by the foregoing method embodiment.

The computer program product provided by the embodiment of the present application includes a computer readable storage medium storing program codes, where the instructions included in the program codes may be used to execute the method in the foregoing method embodiment, and specific implementation may refer to the method embodiment and will not be described herein.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer readable storage medium executable by a processor. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method of the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

Finally, it should be noted that: the above examples are only specific embodiments of the present invention for illustrating the technical solution of the present invention, but not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the foregoing examples, it will be understood by those skilled in the art that the present invention is not limited thereto: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims (10)

1. An electric quantity measuring method of a three-phase three-wire electric energy meter is characterized by comprising the following steps:

periodically sampling voltage loop data from a metering unit of a target electric energy meter, wherein the target electric energy meter is a three-phase three-wire electronic electric energy meter, an initial value of an electric energy meter constant of the target electric energy meter is a calibration value, and the calibration value is used for metering electricity consumption under the condition that a voltage loop of the target electric energy meter is normal;

Under the condition that the abnormal phase voltage of the voltage loop is determined according to the voltage loop data, the value of the electric energy meter constant is adjusted to be a correction value, wherein the correction value is used for reducing the influence of the abnormal phase voltage of the voltage loop on the electricity consumption metering process of the electric energy meter;

and according to the correction value of the electric energy meter constant, adjusting the frequency value of the pulse output frequency of the target electric energy meter from the frequency value of the current period to the correction frequency value, and determining the electricity consumption of the next period by utilizing the correction frequency value of the pulse output frequency.

2. The method of claim 1, wherein the metering unit comprises an a-phase transformer loop and a C-phase mutual inductor loop, wherein periodically sampling voltage loop data from the metering unit of the target electric energy meter comprises:

periodically sampling a line voltage U1 of the a-phase mutual-sensor loop and a line voltage U3 of the C-phase mutual-sensor loop;

periodically sampling the phase angle phi 1 of the A-phase transformer loop and the phase angle phi 3 of the C-phase transformer loop;

periodically sampling the three-phase voltage vector sum of the metering units

3. The method of claim 2, wherein periodically sampling voltage loop data from a metering unit of a target electric energy meter comprises:

The voltage loop data is sampled from the metering unit of the target electric energy meter at a frequency of 3 times per second.

4. The method of claim 2, wherein determining from the voltage loop data whether an anomaly has occurred in a phase voltage of the voltage loop comprises:

according to the comparison result between the line voltage U1 of the A-phase transformer loop and the reference voltage, the comparison result between the line voltage U3 of the C-phase transformer loop and the reference voltage, and the three-phase voltage vector sum of the metering unitAnd determining whether the phase voltage of the voltage loop is abnormal or not according to a comparison result between the phase angle phi U of the phase-A mutual inductor loop and the phase angle phi U of the phase-C mutual inductor loop and a reference angle.

5. The method of claim 4, wherein the phase voltage anomalies of the voltage circuit include reverse phase sequence, phase a loss of voltage, phase B loss of voltage, phase C loss of voltage, and phase two loss of voltage.

6. The method of claim 4, wherein the three-phase voltage vector sum of the metering unit is based on a comparison between the line voltage U1 of the phase A transformer loop and a reference voltage, a comparison between the line voltage U3 of the phase C transformer loop and the reference voltage Comparing results between the phase angle phi U of the phase-A mutual inductor loop and the phase angle phi U of the phase-C mutual inductor loop with reference voltage vectors, and determining whether the phase voltage of the voltage loop is abnormal or not, comprising the following steps:

the line voltage U1 of the A-phase transformer loop is larger than or equal to the reference voltage, the line voltage U3 of the C-phase transformer loop is larger than or equal to the reference voltage, and the three-phase voltage vector sum of the metering unitUnder the condition that the reference voltage vector is larger than or equal to the first reference included angle and the phase angle included angle phi U is equal to the first reference included angle, determining that the voltage loop is normal;

the line voltage U1 of the A-phase transformer loop is larger than or equal to the reference voltage, the line voltage U3 of the C-phase transformer loop is larger than or equal to the reference voltage, and the three-phase voltage vector sum of the metering unitUnder the condition that the reference voltage vector is larger than or equal to the phase angle phi U and the phase angle phi U is equal to a second reference angle, determining that the voltage loop is in an inverse phase sequence, wherein the sum of the second reference angle and the first reference angle is 0;

the line voltage U1 of the A-phase transformer loop is smaller than the reference voltage, and the line voltage U3 of the C-phase transformer loop is larger than or equal to the reference voltage, and the metering Three-phase voltage vector sum of unitsUnder the condition that the reference voltage vector is larger than or equal to the phase angle phi U and the phase angle phi U is not equal to the first reference angle or the second reference angle, determining that the voltage loop is phase A voltage loss;

the line voltage U1 of the A-phase transformer loop is smaller than the reference voltage, the line voltage U3 of the C-phase transformer loop is smaller than the reference voltage, and the three-phase voltage vector sum of the metering unitsWhen the voltage loop is larger than or equal to the reference voltage vector and the phase angle phi U is not equal to the first reference angle or the second reference angle, determining that the voltage loop is in phase B voltage loss;

the line voltage U1 of the A-phase transformer loop is larger than or equal to the reference voltage, the line voltage U3 of the C-phase transformer loop is smaller than the reference voltage, and the three-phase voltage vector sum of the metering unitUnder the condition that the reference voltage vector is larger than or equal to the phase angle phi U and the phase angle phi U is not equal to the first reference angle or the second reference angle, determining that the voltage loop is in phase C voltage loss;

the line voltage U1 of the A-phase transformer loop is smaller than the reference voltage, the line voltage U3 of the C-phase transformer loop is smaller than the reference voltage, and the three-phase voltage vector sum of the metering units And under the condition that the phase angle phi U is smaller than the reference voltage vector and is not equal to the first reference angle or the second reference angle, determining that the voltage loop is two-phase voltage loss.

7. The method according to claim 5, wherein, in the case where it is determined from the voltage loop data that an abnormality occurs in the phase voltage of the voltage loop, adjusting the value of the electric energy meter constant to a corrected value includes:

and under the condition that the phase voltage loss of the voltage loop is determined according to the voltage loop data, determining and adjusting a correction value K of the electric energy meter constant according to the following formula:

wherein k is a calibration value, and phi is a phase angle;

and under the condition that the reverse phase sequence of the voltage loop is determined according to the voltage loop data, the correction value of the electric energy meter constant is determined and adjusted according to the following formula:

where W' is the virtual power during the reverse phase sequence and W is the power before adjustment.

8. An electrical quantity measuring device of a three-phase three-wire electric energy meter, characterized by comprising:

the sampling module is used for periodically sampling voltage loop data from a metering unit of a target electric energy meter, wherein the target electric energy meter is a three-phase three-wire electronic electric energy meter, an initial value of an electric energy meter constant of the target electric energy meter is a calibration value, and the calibration value is used for metering electricity consumption under the condition that a voltage loop of the target electric energy meter is normal;

The correction module is used for adjusting the value of the electric energy meter constant to a correction value under the condition that the abnormal phase voltage of the voltage loop is determined according to the voltage loop data, wherein the correction value is used for reducing the influence of the abnormal phase voltage of the voltage loop on the electricity consumption metering process of the electric energy meter;

and the compensation module is used for adjusting the frequency value of the pulse output frequency of the target electric energy meter from the frequency value of the current period to a correction frequency value according to the correction value of the electric energy meter constant, and determining the power consumption of the next period by utilizing the correction frequency value of the pulse output frequency.

9. An electronic device, comprising: memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor performs the method according to any of the preceding claims 1 to 7 by means of the computer program.

10. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, performs the steps of the method of any of the preceding claims 1 to 7.