CN115166351A

CN115166351A - Correction coefficient calculation method and device based on three-phase three-wire metering device

Info

Publication number: CN115166351A
Application number: CN202210893594.8A
Authority: CN
Inventors: 陈芳; 骆光; 高勇华; 朱斯豪; 林伟文; 赖波涛; 高小明; 曾锦明; 麦聪; 张丽友; 邓慧盈; 刘诗迪; 颜懿; 刘云志; 廖杰超; 江雪铭; 郭明宜; 蔡广文; 徐晓明; 谭文灏
Original assignee: Guangdong Power Grid Co Ltd; Huizhou Power Supply Bureau of Guangdong Power Grid Co Ltd
Current assignee: Guangdong Power Grid Co Ltd; Huizhou Power Supply Bureau of Guangdong Power Grid Co Ltd
Priority date: 2022-07-27
Filing date: 2022-07-27
Publication date: 2022-10-11

Abstract

The embodiment of the invention discloses a correction coefficient calculation method based on a three-phase three-wire metering device, wherein the three-phase three-wire metering device is electrically connected with a three-phase access line, and the calculation method comprises the following steps: detecting three-phase voltage vectors and two-phase current vectors of the three-phase three-wire metering device under any wiring; determining the actual wiring phase sequence and the phase failure position of the three-phase three-line metering device according to the three-phase voltage vector and the two-phase current vector; calculating an actual active power value according to a first preset rule according to the phase failure position; and determining a correction coefficient according to the actual active power value and the theoretical active power value. The technical scheme provided by the embodiment of the invention can improve the calculation efficiency and the accuracy of the correction coefficient of the three-phase three-wire metering device.

Description

Correction coefficient calculation method and device based on three-phase three-wire metering device

Technical Field

The embodiment of the invention relates to the technical field of electric energy metering, in particular to a correction coefficient calculation method and device based on a three-phase three-wire metering device.

Background

The accuracy of the electric energy metering device directly influences the fairness of trade settlement and the formulation of the internal economic and technical indexes of the electric power enterprise. In the installation and wiring process of the electric energy meter and the mutual inductor, wrong wiring may occur, and meanwhile, artificial wrong wiring for the purpose of electricity stealing may occur, so that mastering of an analysis method of the wrong wiring is particularly important for technicians engaged in metering.

At present, the wiring mode is the condition that a three-phase three-wire metering circuit has a phase failure, which is a common condition in the daily operation and maintenance work of a metering device, and further, the electric quantity is less calculated or calculation is omitted, even the calculation process is inaccurate, the analysis is improper, and thus the economic loss of enterprises is caused.

Disclosure of Invention

The invention provides a method and a device for calculating a correction coefficient based on a three-phase three-wire metering device, which are used for improving the calculation efficiency and the accuracy of the correction coefficient of the three-phase three-wire metering device.

In a first aspect, an embodiment of the present invention provides a method for calculating a correction coefficient based on a three-phase three-wire metering device, where the three-phase three-wire metering device is electrically connected to a three-phase access line, and the method includes:

detecting three-phase voltage vectors and two-phase current vectors of the three-phase three-wire metering device under any wiring;

determining the actual wiring phase sequence and the phase failure position of the three-phase three-line metering device according to the three-phase voltage vector and the two-phase current vector;

calculating an actual active power value according to the phase failure position and a first preset rule;

and determining a correction coefficient according to the actual active power value and the theoretical active power value.

In a second aspect, an embodiment of the present invention further provides a correction coefficient calculation device based on a three-phase three-wire metering device, where the three-phase three-wire metering device is electrically connected to a three-phase access line, and the correction coefficient calculation device includes:

the detection module is used for detecting three-phase voltage vectors and two-phase current vectors of the three-phase three-wire metering device under any wiring;

the judging module is used for determining the actual wiring phase sequence and the phase failure position of the three-phase three-wire metering device according to the three-phase voltage vector and the two-phase current vector;

and the calculating module is used for calculating an actual active power value according to the phase failure position and a first preset rule, and determining a correction coefficient according to the actual active power value and the theoretical active power value.

In a third aspect, an embodiment of the present invention further provides an electronic device, including:

one or more processors;

storage means for storing one or more programs;

when executed by the one or more processors, the one or more programs cause the one or more processors to implement the method for calculating the correction factor based on the three-phase three-wire metering device according to the first aspect.

In a fourth aspect, the embodiment of the present invention further provides a computer-readable storage medium, where computer instructions are stored, and the computer instructions are configured to enable a processor to implement the method for calculating the correction coefficient based on the three-phase three-wire metering device according to the first aspect when executed.

According to the technical scheme of the embodiment of the invention, the actual wiring phase sequence and the phase failure position of the three-phase three-wire metering device can be determined by detecting the three-phase voltage vector and the two-phase current vector of the three-phase three-wire metering device under any wiring, then the actual active power value can be calculated according to a first preset rule through the determined phase failure position, and then the correction coefficient is determined according to the actual active power value and the theoretical active power value. Therefore, the calculation efficiency and the accuracy of the correction coefficient of the three-phase three-wire metering device are improved, particularly the analysis and processing efficiency and the accuracy of the three-phase three-wire metering device under the condition of phase failure are improved, and loss and safety accidents are avoided.

It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a flowchart of a correction coefficient calculation method based on a three-phase three-wire metering device according to an embodiment of the present invention;

fig. 2 is a schematic diagram illustrating a connection manner of a three-phase three-wire metering device according to an embodiment of the present invention;

FIG. 3 is a flow chart of another method for calculating a correction factor based on a three-phase three-wire metering device according to an embodiment of the present invention;

FIG. 4 is a voltage-current vector diagram according to an embodiment of the present invention;

FIG. 5 is a diagram of another voltage-current vector relationship provided by an embodiment of the present invention;

FIG. 6 is a flowchart of a correction coefficient calculation method based on a three-phase three-wire metering device according to another embodiment of the present invention;

FIG. 7 is a voltage equivalent circuit diagram of a basic metering unit in a three-phase three-wire metering device according to an embodiment of the present invention;

fig. 8 is a voltage-current vector parameter diagram under a correct three-phase three-wire connection according to an embodiment of the present invention;

FIG. 9 is a flowchart of a correction coefficient calculation method based on a three-phase three-wire metering device according to another embodiment of the present invention;

fig. 10 is a schematic structural diagram of a correction coefficient calculating device based on a three-phase three-wire metering device according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Fig. 1 is a flowchart of a correction coefficient calculation method based on a three-phase three-wire metering device according to an embodiment of the present invention, as shown in fig. 1, the calculation method includes:

s101, detecting three-phase voltage vectors and two-phase current vectors of the three-phase three-wire metering device in any wiring.

It can be understood that fig. 2 is a schematic diagram of a wiring connection mode of a three-phase three-wire metering device provided by an embodiment of the present invention, the three-phase three-wire metering device is electrically connected to a three-phase access line ABC, wherein the electricity metering of the three-phase three-wire metering device is composed of a voltage transformer TV1, a voltage transformer TV2, a current transformer TA1, a current transformer TA2, and a three-phase three-wire basic metering unit 100, and in a case that the three-phase three-wire metering device is correctly wired, an a-phase voltage is used as an a-phase voltage

Is connected with

B phase voltage

Is grounded and connected in parallel

C phase voltage

Is connected with

Current of phase A enters

Is connected with

Current of phase C

Then, the first step is to connect the first step,

and

to form a first component of the device,

and

make up the second element, at this time satisfy

However, when the three-phase three-wire metering device is in a wiring error or disconnection, the above equations are not satisfied at the same time, i.e. the voltages or currents connected to the first and second elements are not necessarily the correct voltages or currents. Thus, three-phase voltage vectors of the three-phase three-wire metering device under any wiring are detected

And

and two-phase current vector

And

whether the three-phase three-wire metering device has the problem of wiring errors, particularly the problem of phase failure caused by disconnection of the wiring can be determined through further judgment and analysis.

And S102, determining the actual wiring phase sequence and the phase failure position of the three-phase three-wire metering device according to the three-phase voltage vector and the two-phase current vector.

Specifically, referring to fig. 2, in the case where the three-phase three-wire metering device is correctly wired, the three-phase voltage vector obtained by detection is detected

And

should correspond to respectively

And

wherein the content of the first and second substances,

is zero and the voltage amplitude of (a) is zero,

and

of the same voltage, two-phase current vector

And

respectively correspond to

And

and is

And

angle therebetween and

and

between themAngle identity, once the three phase voltage vectors actually detected

And

and two-phase current vector

And

the relation of correct wiring is not satisfied, and the voltage value can be directly observed or the three-phase voltage vector can be used

And

and two-phase current vector

And

and determining the actual wiring phase sequence and the phase failure position of the three-phase three-wire metering device by the obtained voltage and current vector relation diagram. It should be noted that when the actual wiring phase sequence and the phase failure position of the three-phase three-wire metering device are determined according to the voltage-current vector relationship diagram, further determination can be performed according to the included angle between the two phase current vectors being 120 degrees, so as to accurately determine the phase failure position.

And S103, calculating an actual active power value according to the phase failure position and a first preset rule.

The first preset rule may be a preset calculation model of electric quantity metering in the three-phase three-wire metering device, such as a calculation formula of actual voltage, and it can be understood that the first preset rule may also be different according to a difference of a phase failure position, and the embodiment of the present invention is not specifically limited herein.

It will be appreciated, with reference to figure 2, that in the case of a correct connection of the three-phase three-wire meter, the power P measured by the first element ₁ Is composed of

Wherein, U _ab Is the line voltage amplitude, I _a Is the value of the current of the a-phase,

is U _ab And I _a The included angle of (A); power P measured by the second element ₂ Is composed of

Wherein, U _cb Is the line voltage amplitude, I _c Is the value of the c-phase current,

is U _cb And I _c The included angle of (a). Therefore, the actual active power value P of the three-phase three-wire metering device is P = P ₁ +P ₂ 。

Therefore, after the specific phase failure of the connecting line of the three-phase three-wire metering device is determined, the actual parameters such as the measured voltage and the measured current can be determined according to the corresponding calculation formula, and then the actual active power value is further calculated.

And S104, determining a correction coefficient according to the actual active power value and the theoretical active power value.

Specifically, the correction coefficient refers to a correction coefficient of a wrong wiring, and is a power value that should be measured under the condition that the electric energy meter is correctly wired under the same power factor, that is, a ratio of a theoretical active power value to an actual active power value measured by the wrong wiring. Furthermore, after the correction coefficient is determined, the electric quantity and the electric charge which need to be compensated can be calculated according to the correction coefficient.

In this embodiment, the three-phase voltage vector and the two-phase current vector of the three-phase three-wire metering device in any wiring are detected, analysis processing is performed to determine the actual wiring phase sequence and the phase failure position of the three-phase three-wire metering device, then the actual active power value can be obtained by calculating according to a first preset rule through the determined phase failure position, and then the correction coefficient is determined according to the actual active power value and the theoretical active power value. Therefore, the calculation efficiency and the accuracy of the correction coefficient of the three-phase three-wire metering device are improved, particularly the analysis and processing efficiency and the accuracy of the three-phase three-wire metering device under the condition of phase failure are improved, and loss and safety accidents are avoided.

Optionally, fig. 3 is a flowchart of another correction coefficient calculation method based on a three-phase three-wire metering device according to an embodiment of the present invention, and as shown in fig. 3, determining an actual wiring phase sequence and a phase failure position of the three-phase three-wire metering device according to a three-phase voltage vector and a two-phase current vector includes: determining a reference voltage vector and a phase voltage vector corresponding to the actual grounding of the three-phase three-wire metering device according to the three-phase voltage vector, wherein the amplitude of the reference voltage vector is equal to the amplitude of the phase voltage measured by the three-phase three-wire metering device when the three-phase three-wire metering device is correctly connected; detecting included angles between two phase current vectors and a reference voltage vector respectively; determining a line voltage vector corresponding to the reference voltage vector according to the reference voltage vector and a phase voltage vector corresponding to the actual grounding of the three-phase three-wire metering device; determining a voltage and current vector parameter diagram according to a line voltage vector corresponding to the reference voltage vector, a two-phase current vector and an included angle between the two-phase current vector and the reference voltage vector; and when the voltage-current vector parameter diagram meets a second preset rule, determining the actual wiring phase sequence and the phase failure position of the three-phase three-wire metering device. Therefore, the correction coefficient calculation method includes the steps of:

s301, detecting three-phase voltage vectors and two-phase current vectors of the three-phase three-wire metering device in any wiring.

S302, determining a reference voltage vector and a phase voltage vector corresponding to the actual grounding of the three-phase three-wire metering device according to the three-phase voltage vector, wherein the amplitude of the reference voltage vector is equal to the amplitude of the phase voltage measured by the three-phase three-wire metering device when the three-phase three-wire metering device is correctly wired.

In particular, the method comprises the following steps of,detecting three-phase voltage vectors

And

the medium amplitude is compared with a theoretical voltage amplitude (namely a phase voltage amplitude measured by a three-phase three-wire metering device when the metering device is correctly connected), and a three-phase voltage vector

And

and the phase voltage vector with the middle amplitude value equal to the theoretical voltage amplitude value is the reference voltage vector. Meanwhile, three-phase voltage vectors can be used

And

the phase voltage vector with medium amplitude equal to zero is determined as the actual earth phase in the three-phase three-wire metering device, i.e. phase b in fig. 2.

And S303, detecting included angles between the two-phase current vectors and the reference voltage vector respectively.

Specifically, after the reference voltage vector is determined, the two-phase current vector can be further detected and obtained

And

respectively, with respect to the reference voltage vector.

And S304, determining a line voltage vector corresponding to the reference voltage vector according to the reference voltage vector and the phase voltage vector corresponding to the actual grounding of the three-phase three-wire metering device.

Specifically, since the reference voltage vector corresponds to the voltage of the phase connection line to the ground, after the phase voltage vector corresponding to the actual ground of the three-phase three-wire metering device is determined, the line voltage vector consisting of the reference voltage vector and the actual ground phase can be obtained.

Illustratively, the reference voltage vector is

The actual grounding phase of the three-phase three-wire metering device is the phase b, so the line voltage vector corresponding to the reference voltage vector is the phase b

In an uncertain state

In the case of the actual phase a or phase c,

may be that

Or

Therefore, according to the reference voltage vector and the phase voltage vector corresponding to the actual grounding of the three-phase three-wire metering device, the line voltage vector corresponding to the reference voltage vector is determined, and meanwhile, in combination with the analysis of the actual situation, the line voltage vector can be a determined line voltage vector or two uncertain line voltage vectors, and when the specific line voltage vector is uncertain, the analysis and determination can be carried out through a further voltage-current vector relation graph.

S305, determining a voltage and current vector parameter diagram according to the line voltage vector corresponding to the reference voltage vector, the two-phase current vector and the included angle between the two-phase current vector and the reference voltage vector.

Specifically, all conditions of line voltage vectors corresponding to the reference voltage vector can be enumerated one by one, and then a plurality of voltage and current vector parameter graphs can be obtained according to different line voltage vectors, two-phase current vectors and included angles between the two-phase current vectors and the reference voltage vector. It should be noted that, after the line voltage vector corresponding to the reference voltage vector is determined, the included angles between the two-phase current vectors and the reference voltage vector are the included angles between the two-phase current vectors and the line voltage vector.

It can be understood that, when determining the voltage-current vector parameter map, it is also necessary to determine whether the phase sequence of the voltage is a positive phase sequence or a negative phase sequence in advance, so as to more accurately determine the two-phase current vector in the voltage-current vector parameter map

And

the included angles between the reference voltage vector and the reference voltage vector are respectively avoided, so that the voltage and current vector parameter diagram is prevented from generating errors, and further analysis and processing are influenced.

And S306, determining the actual wiring phase sequence and the phase failure position of the three-phase three-wire metering device when the voltage and current vector parameter diagram meets a second preset rule.

Optionally, the second preset rule includes that the current polarities of the current vectors of the two phases in the voltage-current vector parameter diagram are the same and the included angle is 120 degrees, and the included angle between the voltage vector and the current vector of the same phase is smaller than 60 degrees. It can be understood that the second predetermined rule further includes that the amplitudes of the current vectors of the two phases are the same, and therefore, the two phases are not described one by one, and those skilled in the art can determine one by one according to the rule that the voltage-current vector parameter map must satisfy to determine the correct voltage-current vector parameter map satisfying all the second predetermined rules, and further determine that the voltage vector corresponding to the voltage-current vector parameter map is correct, and then determine the actual phase voltage vector according to the reference voltage vector, that is, one phase that is not disconnected, and thus determine that the other phase is the one phase that is disconnected. In addition, whether the actual wiring phase sequence at the moment is correct can be determined according to the voltage-current vector parameter diagram.

And S307, calculating the actual active power value according to the phase failure position and a first preset rule.

And S308, determining a correction coefficient according to the actual active power value and the theoretical active power value.

In the following, a specific example is described, in which three phase voltage vectors are detected

And

the corresponding amplitudes are 26V, 0V and 100V, respectively. It is known that a three-phase three-wire metering device reads 100V in the case of correct wiring, and so on

Further measuring two-phase current vector as reference voltage vector

And

are respectively connected with

Are 110 deg. and 350 deg., respectively. Due to the fact that

The amplitude of (A) is 0V, it can be known that

Namely the actual grounding phase b phase of the three-phase three-wire metering device, and further can determine

At this time, the process of the present invention,

may be that

Or

Suppose that

Two phase current vectors

And

are respectively connected with

The included angles are 110 degrees and 350 degrees, and two-phase current vectors can be obtained

And

actual relative of

The corresponding voltage-current vector parameter diagram is shown in fig. 4. Suppose again that

Two phase current vectors

And

are respectively connected with

And

actual relative of

The corresponding voltage-current vector parameter map is shown in fig. 5. With further reference to FIGS. 4 and 5, assume that

Due to the phase current vectors in the voltage-current vector parameter diagram of fig. 4

And

is greater than 60 degrees, and phase current vector

And

the included angle is larger than 60 degrees, and does not meet the second preset rule. And the phase current vectors in the voltage current vector parameter diagram of FIG. 5

And

is less than 60 degrees, and phase current vector

And with

Is less than 60 degrees, can be determined

I.e. the actual c-phase, and can thus be determined

I.e. the actual phase a, and is phase-off.

Optionally, fig. 6 is a flowchart of a further correction coefficient calculation method based on a three-phase three-wire metering device according to an embodiment of the present invention, as shown in fig. 6, the calculating an actual active power value according to a phase failure position according to a first preset rule includes: determining a voltage equivalent circuit according to a basic metering unit in the three-phase three-wire metering device; determining an actual voltage value measured by a first element and an actual voltage value measured by a second element in the basic metering unit according to the voltage equivalent circuit and the phase failure position; and calculating an actual active power value by using an active power calculation formula according to the actual voltage value measured by the first element, the actual voltage value measured by the second element and the two-phase current vector. Therefore, the correction coefficient calculation method includes the steps of:

s601, detecting three-phase voltage vectors and two-phase current vectors of the three-phase three-wire metering device in any wiring.

And S602, determining the actual wiring phase sequence and the phase failure position of the three-phase three-line metering device according to the three-phase voltage vector and the two-phase current vector.

And S603, determining a voltage equivalent circuit according to a basic metering unit in the three-phase three-wire metering device.

Specifically, fig. 7 is a voltage equivalent circuit diagram of a basic metering unit in a three-phase three-wire metering device according to an embodiment of the present invention, as shown in fig. 7, the voltage equivalent circuit includes three-phase voltage input terminals a, b, and c, a first resistor R1 connected in parallel between the phase a and the phase b voltage input terminal, a second resistor R2 connected in parallel between the phase b and the phase c voltage input terminal, a third resistor R3, and a fourth resistor R4 connected in parallel between the phase a and the phase c voltage input terminal, where the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 have the same resistance, and in a case that the three-phase three-wire metering device is correctly wired and the voltage provided by the access line ABC is balanced, the voltage between each two phases is the same, for example, 100V.

And S604, determining the actual voltage value measured by the first element and the actual voltage value measured by the second element in the basic metering unit according to the voltage equivalent circuit and the phase failure position.

Continuing to refer to fig. 2, the phase-failure position includes a position on the primary side of the voltage transformer or a position on the secondary side of the voltage transformer, where the primary side of the voltage transformer is a side electrically connected to the access line, and the secondary side of the voltage transformer is a side electrically connected to the basic metering unit.

Illustratively, the phase failure position is phase A of the secondary side of the voltage transformer, and the actual voltage value U measured by the first element in the three-phase three-wire metering device can be determined according to the voltage equivalent circuit shown in FIG. 7 _ab Should be that

Actual voltage value U measured by the second element _cb Is U _cb ＝U ₀ Wherein, U ₀ The voltage value between each two phases is under the condition of correct wiring for the three-phase three-wire metering device and the balance of the voltage provided by the access line ABC. Or the phase failure position is B phase of the secondary side of the voltage transformer, the actual voltage value U measured by the first element is _ab Is composed of

Actual voltage value U measured by second element _cb Is composed of

In addition, taking the case that the three-phase three-wire metering device is correctly wired and the voltage provided by the access line ABC is balanced, the voltage value between each two phases is 100, and if a fuse of a certain phase on the primary side of the voltage transformer is fused, the voltage value on the secondary side is also correspondingly changed, and the change range is generally 0V, 50V or 100V. For example, when the primary side A is open-phase, U _ab ＝0V，U _cb ＝U _ca =100V; when the primary side B phase is out of phaseEquivalent to adding a single-phase 100V power supply between AC phases, so that U is adopted _ab ＝U _cb =50V. It can be understood that, a person skilled in the art can determine, by using a voltage equivalent circuit, an actual voltage value measured by a first element and an actual voltage value measured by a second element when any phase voltage is open-phase according to a voltage value between each two phases of a three-phase three-wire metering device in a condition of correct wiring and balanced voltage provided by an access line ABC, which is not illustrated in the present embodiment.

And S605, calculating an actual active power value by using an active power calculation formula according to the actual voltage value measured by the first element, the actual voltage value measured by the second element and the two-phase current vector.

Specifically, fig. 8 is a voltage-current vector parameter diagram under the condition that the three-phase three-wire connection is correct according to the embodiment of the present invention, and the actual voltage value measured by the first element is U as shown in fig. 2 and 8 _ab The actual voltage value measured by the second element is U _cb The current value corresponding to the current vector of the two phases is I _a And I _c Then, an actual active power value P is calculated by using an active power calculation formula as follows:

wherein, I _a Is a phase current value, I _c Is the value of the current of the c-phase,

is U _ab And I _a Is/are as follows the included angle is formed by the angle of inclination,

is U _cb And I _c The included angle of (a).

It will be appreciated that, when the load electrically connected to access line ABC is a balanced load,

and

are identical and can be unified

And (4) showing.

And S606, determining a correction coefficient according to the actual active power value and the theoretical active power value.

Wherein, a correction coefficient is determined according to the actual active power value and the theoretical active power value, and the correction coefficient K can be determined according to the following formula:

wherein, P ₀ Is a theoretical active power value, P is an actual active power value, U is a phase voltage amplitude value, I is a phase voltage amplitude value, U is a phase voltage amplitude value _ab Is the line voltage amplitude, U _cb Is the line voltage amplitude, I _a Is a phase current value, I _c Is the value of the c-phase current,

is U _cb And I _c Is the included angle is formed by the angle of inclination,

is the angle between U and I.

Optionally, fig. 9 is a flowchart of a correction coefficient calculation method based on a three-phase three-wire metering device according to an embodiment of the present invention, and as shown in fig. 9, after determining the correction coefficient according to the actual power value and the theoretical power value, the method further includes: acquiring an error electric energy value when the three-phase three-wire metering device is in phase failure; and determining the compensation electric quantity and the compensation withdrawal cost according to the correction coefficient and the error electric energy value. Therefore, the correction coefficient calculation method includes the steps of:

and S901, detecting three-phase voltage vectors and two-phase current vectors of the three-phase three-wire metering device under any wiring.

And S902, determining the actual wiring phase sequence and the phase failure position of the three-phase three-wire metering device according to the three-phase voltage vector and the two-phase current vector.

And S903, calculating the actual active power value according to the phase failure position and a first preset rule.

And S904, determining a correction coefficient according to the actual active power value and the theoretical active power value.

And S905, acquiring an error electric energy value when the three-phase three-wire metering device is out of phase.

And S906, determining the compensation electric quantity and the compensation withdrawal cost according to the correction coefficient and the error electric energy value.

Specifically, the purpose of calculating the correction coefficient of the three-phase three-wire metering device is to calculate the correction coefficient and the error electric energy value when the three-phase three-wire metering device is out of phase to obtain the compensation electric quantity, and return more electric charge or compensate less electric charge so as to reduce the loss of enterprises or power grid companies. Usually, the calculation formula of the compensation electric quantity Δ W is Δ W = (K-1) W _e Wherein W is _e The error electric energy value is the error electric energy value when the three-phase three-wire metering device is out of phase.

Based on the same inventive concept, an embodiment of the present invention further provides a correction coefficient calculation apparatus based on a three-phase three-wire metering device, fig. 10 is a schematic structural diagram of the correction coefficient calculation apparatus based on the three-phase three-wire metering device according to the embodiment of the present invention, and as shown in fig. 2 and fig. 10, the three-phase three-wire metering device is electrically connected to a three-phase access line ABC, and the correction coefficient calculation apparatus includes: the detection module 10 is used for detecting three-phase voltage vectors and two-phase current vectors of the three-phase three-wire metering device under any wiring; the judging module 20 is configured to determine an actual wiring phase sequence and a phase failure position of the three-phase three-wire metering device according to the three-phase voltage vector and the two-phase current vector; the calculating module 30 is configured to calculate an actual active power value according to the phase failure position and according to a first preset rule, and determine a correction coefficient according to the actual active power value and the theoretical active power value.

In this embodiment, the detection module 10 detects a three-phase voltage vector and a two-phase current vector of the three-phase three-wire metering device under any wiring, the determination module 20 performs analysis processing to determine an actual wiring phase sequence and an open-phase position of the three-phase three-wire metering device, the calculation module 30 calculates an actual active power value according to a first preset rule by using the determined open-phase position, and determines a correction coefficient according to the actual active power value and the theoretical active power value. Therefore, the correction coefficient calculation device can improve the calculation efficiency and the accuracy of the correction coefficient of the three-phase three-wire metering device, particularly the analysis and processing efficiency and the accuracy of the three-phase three-wire metering device under the condition of phase failure, and avoids loss and safety accidents.

Optionally, the three-phase three-wire metering device comprises a voltage transformer and a basic metering unit which are electrically connected; the open-phase position of the three-phase three-wire metering device comprises a position located on the primary side of a voltage transformer or a position located on the secondary side of the voltage transformer, wherein the primary side of the voltage transformer is one side electrically connected with an access line, and the secondary side of the voltage transformer is one side electrically connected with a basic metering unit.

Fig. 11 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 11, the electronic device includes a display terminal 100; the display terminal comprises at least one processor 101; and a memory 102 communicatively coupled to the at least one processor 101; the memory 102 stores a computer program executable by the at least one processor 101, and the computer program is executed by the at least one processor 101, so that the at least one processor 101 can execute the method for calculating the correction factor based on the three-phase three-wire metering device according to any of the above embodiments.

Specifically, the electronic device may further include an input device 103 and an output device 104.

The processor 101, the memory 102, the input device 103, and the output device 104 in the electronic apparatus may be connected by a bus or other means, and fig. 11 illustrates an example of connection by a bus.

The memory 102 in the electronic device is used as a computer-readable storage medium for storing one or more programs, which may be software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the method for calculating the correction coefficient based on the three-phase three-wire metering device provided in the embodiments of the present invention. The processor 101 executes various functional applications and data processing of the electronic device by running software programs, instructions and modules stored in the memory 102, that is, implements the correction coefficient calculation method based on the three-phase three-wire metering device in the above method embodiment.

The memory 102 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to use of the electronic device, and the like. Further, the memory 102 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 102 may further include memory located remotely from the processor 101, which may be connected to the device over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

The input device 103 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the electronic apparatus. The output device 104 may include a display device such as a display screen.

And, when the one or more programs included in the above-mentioned electronic device are executed by the one or more processors 101, the programs perform the following operations:

calculating an actual active power value according to a first preset rule according to the phase failure position;

Of course, it can be understood by those skilled in the art that when one or more programs included in the electronic device are executed by the one or more processors 101, the programs may also perform related operations in the method for calculating the correction coefficient based on the three-phase three-wire metering device provided in any embodiment of the present invention.

An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to perform a method for calculating a correction coefficient based on a three-phase three-wire metering device, where the method includes:

Computer storage media for embodiments of the invention may employ any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a Read Only Memory (ROM), an Erasable Programmable Read Only Memory (EPROM), a flash Memory, an optical fiber, a portable CD-ROM, an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. A computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.

A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take a variety of forms, including, but not limited to: an electromagnetic signal, an optical signal, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.

Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, radio Frequency (RF), etc., or any suitable combination of the foregoing.

Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C + +, or the like, as well as conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).

The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for calculating a correction factor based on a three-phase three-wire metering device electrically connected to a three-phase access line, the method comprising:

2. The method of claim 1, wherein determining the actual phase sequence of the three-phase three-wire meter and the position of phase failure based on the three-phase voltage vector and the two-phase current vector comprises:

determining a reference voltage vector and a phase voltage vector corresponding to the actual grounding of the three-phase three-wire metering device according to the three-phase voltage vector, wherein the amplitude of the reference voltage vector is equal to the amplitude of the phase voltage measured by the three-phase three-wire metering device when the three-phase three-wire metering device is correctly wired;

detecting included angles between the two phase current vectors and the reference voltage vector respectively;

determining a line voltage vector corresponding to the reference voltage vector according to the reference voltage vector and a phase voltage vector corresponding to the actual grounding of the three-phase three-wire metering device;

determining a voltage and current vector parameter diagram according to the line voltage vector corresponding to the reference voltage vector, the two-phase current vector and the included angle between the two-phase current vector and the reference voltage vector;

and when the voltage-current vector parameter diagram meets a second preset rule, determining the actual wiring phase sequence and the phase failure position of the three-phase three-wire metering device.

3. The method according to claim 2, wherein the second predetermined rule comprises: in the voltage-current vector parameter diagram, the current polarities of the two-phase current vectors are the same, and the included angle is 120 degrees, and the included angle between the voltage vector and the current vector of the same phase is less than 60 degrees.

4. The method for calculating a correction coefficient according to claim 1, wherein calculating an actual active power value according to a first predetermined rule based on the phase-lost position comprises:

determining a voltage equivalent circuit according to a basic metering unit in the three-phase three-wire metering device;

determining an actual voltage value measured by a first element and an actual voltage value measured by a second element in the basic metering unit according to the voltage equivalent circuit and the phase failure position;

and calculating an actual active power value by using an active power calculation formula according to the actual voltage value measured by the first element, the actual voltage value measured by the second element and the two-phase current vector.

5. The method for calculating correction coefficients according to claim 1, wherein determining the correction coefficients according to the actual power value and the theoretical power value comprises:

the correction coefficient K is determined according to the following formula:

wherein, P ₀ Is a theoretical active power value, P is an actual active power value, U is a phase voltage amplitude value, I is a phase voltage amplitude value, U is a phase voltage amplitude value _ab Is the line voltage amplitude, U _cb Is the line voltage amplitude, I _a Is a phase current value, I _c Is the value of the current of the c-phase,

is U _ab And I _a Is the included angle is formed by the angle of inclination,

is U _cb And I _c Is/are as follows the included angle is formed by the angle of inclination,

is the included angle between U and I.

6. The method for calculating the correction coefficient according to claim 1, further comprising, after determining the correction coefficient according to the actual power value and the theoretical power value:

acquiring an error electric energy value when the three-phase three-wire metering device is in phase failure;

and determining the compensation electric quantity and the compensation withdrawal cost according to the correction coefficient and the error electric energy value.

7. A correction factor calculation device based on a three-phase three-wire metering device, the three-phase three-wire metering device being electrically connected to a three-phase access line, the correction factor calculation device comprising:

the detection module is used for detecting a three-phase voltage vector and a two-phase current vector of the three-phase three-wire metering device under any wiring;

the judging module is used for determining the actual wiring phase sequence and the phase failure position of the three-phase three-line metering device according to the three-phase voltage vector and the two-phase current vector;

8. The correction factor calculation device according to claim 7, wherein the three-phase three-wire metering device comprises a voltage transformer and a basic metering unit which are electrically connected;

the open-phase position of the three-phase three-wire metering device comprises a position located on the primary side of the voltage transformer or a position located on the secondary side of the voltage transformer, wherein the primary side of the voltage transformer is one side electrically connected with the access line, and the secondary side of the voltage transformer is one side electrically connected with the basic metering unit.

9. An electronic device, comprising:

one or more processors;

storage means for storing one or more programs;

when executed by the one or more processors, cause the one or more processors to implement a method of calculating correction coefficients for a three-phase three-wire metering device according to claims 1-6.

10. A computer-readable storage medium having stored thereon computer instructions for causing a processor to execute a method for calculating correction factors based on a three-phase three-wire metering device according to claims 1-6.