阅读说明：本技术 应用于三相三线电能表的电能计量方法、电能计量装置 (Electric energy metering method and electric energy metering device applied to three-phase three-wire electric energy meter ) 是由 李秋实 易文 苗书立 于 2020-12-15 设计创作，主要内容包括：本申请属于电力计量技术领域,提供了一种应用于三相三线电能表的电能计量方法、电能计量装置、终端设备以及计算机可读存储介质,通过获取三相三线电能表在任意接线下的电压向量信息和电流向量信息,并根据所述电压向量信息和所述电流向量信息生成矢量图数据,然后获取负载信息,并根据所述矢量图数据和所述负载信息确定所述三相三线电能表的接线方式,根据所述三相三线电能表的接线方式生成电能数据,可实现电表任意接线方式下,均能正确进行电能计量,并且支持任意电网应用场景下均能输出正确的电能脉冲。(The utility model belongs to the technical field of electric power measurement, a be applied to electric energy metering method, electric energy metering device, terminal equipment and the readable storage medium of computer of three-phase three-wire electric energy meter are provided, through obtaining voltage vector information and current vector information of three-phase three-wire electric energy meter under arbitrary wiring, and according to voltage vector information with current vector information generates vector diagram data, then obtains load information, and according to vector diagram data with load information confirms the mode of wiring of three-phase three-wire electric energy meter, according to the mode of wiring of three-phase three-wire electric energy meter generates electric energy data, can realize under the arbitrary mode of wiring of ammeter, the homoenergetic correctly carries out the electric energy measurement to support homoenergetic output correct electric energy pulse under the arbitrary electric wire netting applied scene.)

1. An electric energy metering method applied to a three-phase three-wire electric energy meter is characterized by comprising the following steps:

acquiring voltage vector information and current vector information of the three-phase three-wire electric energy meter under any wiring;

generating vector diagram data according to the voltage vector information and the current vector information;

acquiring load information, and determining a wiring mode of the three-phase three-wire electric energy meter according to the vector diagram data and the load information;

and generating electric energy data according to the wiring mode of the three-phase three-wire electric energy meter.

2. The method of power metering of claim 1 wherein said generating vector map data from said voltage vector information and said current vector information comprises:

obtaining a vector angle of voltage and a vector angle of current;

and determining a vector diagram corresponding to the wiring mode of the three-phase three-wire electric energy meter according to the vector angle of the voltage and the vector angle of the current.

3. The method of claim 1 wherein said obtaining load information and determining the wiring scheme of said three-phase three-wire power meter based on said vector graphics data and said load information comprises:

determining the range of a wiring mode according to the vector diagram data;

and acquiring load information, and screening the wiring mode of the electric energy meter from the range of the wiring mode according to the load information.

4. The method of claim 3 wherein said determining a range of wiring patterns based on said vector graphics data comprises:

and comparing the vector diagram data with preset vector diagram data to determine the range of the wiring mode.

5. The method for metering electric energy according to claim 1, wherein the generating electric energy data according to the wiring mode of the three-phase three-wire electric energy meter comprises:

adjusting the phase sequence inside the electric energy meter according to the wiring mode of the three-phase three-wire electric energy meter;

and calculating the electric energy data by adopting a preset electric quantity calculation formula according to the adjusted phase sequence.

6. The electric energy metering method of claim 5, further comprising:

and calculating the compensation electric quantity according to the electric quantity calculated by the adjusted phase sequence and the current electric quantity of the electric energy meter.

7. An electric energy metering device, comprising:

the wiring detection module is used for acquiring voltage vector information and current vector information of the three-phase three-wire electric energy meter under any wiring and generating vector diagram data according to the voltage vector information and the current vector information;

the power correction module is used for acquiring load information and determining a wiring mode of the three-phase three-wire electric energy meter according to the vector diagram data and the load information;

and the electric energy calculating module is used for generating electric energy data according to the wiring mode of the three-phase three-wire electric energy meter.

8. The electric energy metering device of claim 7, wherein the electric energy calculating module is further configured to calculate a compensation electric energy according to the electric energy calculated by the adjusted phase sequence and the current electric energy of the electric energy meter.

9. A terminal device, characterized in that the terminal device comprises a memory, a processor and a computer program stored in the memory and operable on the terminal device, the processor implementing the steps of the electric energy metering method according to any one of claims 1 to 6 when executing the computer program.

10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method for metering electric energy according to any one of claims 1 to 6.

Technical Field

The application belongs to the technical field of electric power metering, and particularly relates to an electric energy metering method, an electric energy metering device, terminal equipment and a computer readable storage medium applied to a three-phase three-wire electric energy meter.

Background

The three-phase three-wire electric energy meter has huge application quantity in a power grid, and is easy to generate wiring errors due to complex wiring; once the occurrence happens, economic disputes can be generated between the mobile terminal and the user, and the marketing workload is increased. At present, the fault compensation electric quantity of a line is calculated, and generally, a worker conducts derivation calculation step by step according to a formula. However, the formula steps are complicated, the proportion of people who can be skillfully master the metering calculation is small, and in order to ensure the accuracy of the calculation, the calculation is often required for many times, the workload of workers is increased, the efficiency is low, and the error rate is high. The mode of derivation through the formula is difficult to obtain the approval of customers, the correctness of the customer cannot be verified, and disputes are easy to generate in the actual work.

Although the existing fault electric quantity compensation method and system propose the determination method of the three-phase three-wire wrong wiring mode and the compensation mode of the electric quantity, the following defects exist

(1) It is assumed that the inductive load operates in the (0, 60) interval and the capacitive load operates in the (300, 360) interval. The actual power grid environment is complex, and when the electric meter operates in a tie line environment, namely when the tide changes, an error occurs when the method is used for supplementing the electric energy.

(2) When the electric meter is connected in a wrong way, even if the wrong connection is detected, the pulse output of the electric meter is still wrong, the accuracy of the compensation cannot be judged visually, and the accuracy and the legality of the electric energy compensation cannot be checked according to the verification standard of the electric energy meter.

(3) Calculating the correct power by power factor angle is complicated and the approximation method used will cause errors.

Disclosure of Invention

The application aims to provide an electric energy metering method, an electric energy metering device, terminal equipment and a computer readable storage medium applied to a three-phase three-wire electric energy meter, which can correctly perform electric energy metering and output correct electric energy pulse in any wiring mode and aim to solve the problem of error in the existing electric quantity compensation method.

The embodiment of the application provides an electric energy metering method applied to a three-phase three-wire electric energy meter in a first aspect, which comprises the following steps:

acquiring voltage vector information and current vector information of the three-phase three-wire electric energy meter under any wiring;

generating vector diagram data according to the voltage vector information and the current vector information;

acquiring load information, and determining a wiring mode of the three-phase three-wire electric energy meter according to the vector diagram data and the load information;

and generating electric energy data according to the wiring mode of the three-phase three-wire electric energy meter.

Optionally, the generating vector diagram data according to the voltage vector information and the current vector information includes:

obtaining a vector angle of voltage and a vector angle of current;

and determining a vector diagram corresponding to the wiring mode of the three-phase three-wire electric energy meter according to the vector angle of the voltage and the vector angle of the current.

Optionally, the obtaining load information and determining a wiring mode of the three-phase three-wire electric energy meter according to the vector diagram data and the load information includes:

determining the range of a wiring mode according to the vector diagram data;

and acquiring load information, and screening the wiring mode of the electric energy meter from the range of the wiring mode according to the load information.

Optionally, the determining a range of a wiring manner according to the vector diagram data includes:

and comparing the vector diagram data with preset vector diagram data to determine the range of the wiring mode.

Optionally, the generating of the electric energy data according to the wiring manner of the three-phase three-wire electric energy meter includes:

adjusting the phase sequence inside the electric energy meter according to the wiring mode of the three-phase three-wire electric energy meter;

and calculating the electric energy data by adopting a preset electric quantity calculation formula according to the adjusted phase sequence.

Optionally, the electric energy metering method further includes:

and calculating the compensation electric quantity according to the electric quantity calculated by the adjusted phase sequence and the current electric quantity of the electric energy meter.

A second aspect of the embodiments of the present application further provides an electric energy metering device, including:

the wiring detection module is used for acquiring voltage vector information and current vector information of the three-phase three-wire electric energy meter under any wiring and generating vector diagram data according to the voltage vector information and the current vector information;

the power correction module is used for acquiring load information and determining a wiring mode of the three-phase three-wire electric energy meter according to the vector diagram data and the load information;

and the electric energy calculating module is used for generating electric energy data according to the wiring mode of the three-phase three-wire electric energy meter.

Optionally, the electric energy calculation module is further configured to calculate a compensation electric quantity according to the electric quantity calculated by the adjusted phase sequence and the current electric quantity of the electric energy meter.

The third aspect of the embodiments of the present application further provides a terminal device, where the terminal device includes a memory, a processor, and a computer program stored in the memory and executable on the terminal device, and the processor, when executing the computer program, implements the steps of the electric energy metering method according to any one of the above.

The fourth aspect of the present embodiment also provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the computer program implements the steps of the electric energy metering method according to any one of the above.

The embodiment of the application provides an electric energy metering method, electric energy metering device, terminal equipment and computer readable storage medium for three-way electric energy meter of three-phase, through obtaining voltage vector information and current vector information of three-way electric energy meter under arbitrary wiring, and according to voltage vector information with current vector information generation vector diagram data, then obtain load information, and according to vector diagram data with load information confirms the mode of wiring of three-way electric energy meter of three-phase, according to the mode of wiring of three-way electric energy meter generates electric energy data, can realize under the arbitrary mode of wiring of ammeter, the homoenergetic correctly carries out the electric energy measurement to support homoenergetic output correct electric energy pulse under the arbitrary electric wire netting applied scene.

Drawings

Fig. 1 is a schematic flow chart of an electric energy metering method according to an embodiment of the present application;

fig. 2 is a schematic wiring diagram of a three-phase three-wire electric energy meter according to another embodiment of the present application;

FIGS. 3a-3f are voltage vector diagrams provided by embodiments of the present application;

FIGS. 4a-4d are diagrams of current vectors provided by embodiments of the present application;

FIG. 5 is a schematic structural diagram of an electric energy metering device provided by an embodiment of the present application;

fig. 6 is a schematic structural diagram of a terminal device according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In the description of the present application, it is to be understood that the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

In a first aspect, the present embodiment provides an electric energy metering method applied to a three-phase three-wire electric energy meter, and referring to fig. 1, the electric energy metering method in the present embodiment includes steps S10 to S40.

Step S10: and acquiring voltage vector information and current vector information of the three-phase three-wire electric energy meter under any wiring.

In this embodiment, the voltage vectors and currents of three power lines accessed by the electric energy meter are detected by the wiring detection device, so as to obtain corresponding voltage vector information and current vector information.

In this embodiment, there are 48 connection modes of three power lines accessed by the three-phase three-wire electric energy meter, specifically, for detected voltage vector information, the voltage vector information includes voltage phase sequence types, see the connection diagram of the three-phase three-wire electric energy metering device in fig. 2, there are 6 voltage phase sequence types, where UaUbUc (Ua, Ub, Uc are three power lines) is a normal connection, UbUcUa and UcUaUb are in a wrong order (i.e., a positive phase sequence), and UaUcUb, ubuuc and UcUbUa are in a reverse order.

Specifically, in the present embodiment, for the detected current vector information, the current vector information includes the current phase sequence type, IaIc is normal wiring, and icha is wrong wiring.

Specifically, in this embodiment, the current vector information further includes the current polarity type, Ia + Ic + is normal wiring, and Ia + Ic-, Ia-Ic + is wrong wiring.

Step S20: and generating vector diagram data according to the voltage vector information and the current vector information.

In this embodiment, regardless of the phase relationship between the current and the voltage, the voltage has 2 vector relationships, and the vector relationship between the voltage includes: positive voltage phase sequence and negative voltage phase sequence; there are 4 vector relationships for current, including: the current positive phase sequence, the current negative phase sequence, the current polarity are normal, and the current of one phase has the reverse polarity; therefore, 2 x 4-8 vector diagrams can be combined together based on the electrical voltage vector information and the current vector information.

Specifically, the current vector diagram is shown in table 1.

Table 1:

serial number	Vector diagram mode
		1	Positive voltage phase sequence, positive current phase sequence
2	Positive voltage phase sequence, positive current phase sequence, negative polarity of one-phase current
		3	Positive voltage phase sequence and negative current phase sequence
4	Positive voltage phase sequence, negative current phase sequence, reverse polarity of one-phase circuit
		5	Reverse phase sequence of voltage, positive phase sequence of current
6	Reverse phase sequence of voltage, positive phase sequence of current, reverse polarity of one-phase current
		7	Reverse phase sequence of voltage and reverse phase sequence of current
8	Reverse phase sequence of voltage, reverse phase sequence of current, reverse polarity of one-phase current

As an embodiment of the present application, step S20: generating vector graphics data from the voltage vector information and the current vector information, comprising: obtaining a vector angle of voltage and a vector angle of current; and determining a vector diagram corresponding to the wiring mode of the three-phase three-wire electric energy meter according to the vector angle of the voltage and the vector angle of the current.

In this embodiment, there are 6 connection modes between the power lines Ua, Ub, Uc, but only the positive voltage phase sequence vector diagram and the negative voltage phase sequence vector diagram, specifically, in the positive voltage phase sequence vector diagram, the included angle between Uab and Ucb is 300 °, specifically as shown in fig. 3a, fig. 3b and fig. 3 c. In the voltage negative phase-sequence vector diagram, the angle between Uac and Ubc is 60 °, see in particular fig. 3d, fig. 3e and fig. 3 f.

As an embodiment of the present application, a current positive phase-sequence vector diagram is shown in fig. 4a and 4b, and a current negative phase-sequence vector diagram is shown in fig. 4c and 4 d.

As an embodiment of the present application, the determination method of the voltage vector is shown in table 2.

Table 2:

in the embodiment, since the phase sequence of the current is only related to the included angle between the currents, the current positive phase sequence/the current negative phase sequence can be determined through the included angle between the current channel 3 and the current channel 1. Through the included angle between the currents, only the categories of the reverse polarity of the current can be preliminarily determined, and the categories are four categories, as shown in table 3.

Table 3:

step S30: and acquiring load information, and determining the wiring mode of the three-phase three-wire electric energy meter according to the vector diagram data and the load information.

In the embodiment, the wiring mode of the three-phase three-wire electric energy meter is determined by load information and the detected vector diagram. Specifically, the wiring mode of the three-phase three-wire electric energy meter is determined by the current vector diagram and the current power factor information of the load.

As an embodiment of the present application, step S30: acquiring load information, and determining a wiring mode of the three-phase three-wire electric energy meter according to the vector diagram data and the load information, wherein the wiring mode comprises the following steps: determining the range of a wiring mode according to the vector diagram data; and acquiring load information, and screening the wiring mode of the electric energy meter from the range of the wiring mode according to the load information.

Specifically, in this embodiment, after preliminarily determining the included angle between the currents and the included angle between the voltages, a vector diagram may be determined, and for the same vector diagram, there may be 6 wiring manners: (1) positive voltage phase sequence, positive current phase sequence; (2) positive voltage phase sequence, positive current phase sequence, and one-phase current reverse polarity; (3) the voltage positive phase sequence and the current negative phase sequence; (4) positive voltage phase sequence, negative current phase sequence and one-phase current reversed polarity; (5) the reverse phase sequence of voltage and the positive phase sequence of current; (6) the voltage negative phase sequence, the current positive phase sequence and the one-phase current reverse polarity; (7) the voltage is in a reverse phase sequence, and the current is in a reverse phase sequence; (8) the voltage reverse phase sequence, the current reverse phase sequence, and the one-phase current reverse polarity are shown in table 4.

Table 4:

referring to table 4, in the present embodiment, by classifying 6 wiring modes in the same vector diagram, power of each wiring mode is calculated according to a preset power calculation formula Pw ═ U1'× I1' × COS ([ β 1') + U2' × I2'× COS ([ β 2'), where U1', U2', I1', I2', [ β 1', [ β 2') are respectively corrected voltage, current, and power; u1, U2, i1, i2,. angle.beta.1 and. beta.2 are measured voltage, current and power factor angle.

In the present embodiment, there may be only six possible wiring modes for each vector diagram type; and the types of wiring modes can be further reduced according to the load power factor given by the site.

Specifically, as an embodiment of the present application, determining a range of a wiring manner according to the vector diagram data includes: and comparing the vector diagram data with preset vector diagram data to determine the range of the wiring mode.

Step S40: and generating electric energy data according to the wiring mode of the three-phase three-wire electric energy meter.

In this embodiment, the determined connection mode of the electric energy meter is used to calculate electric energy data based on preset parameters, for example, an included angle ≧ U3U1 between the voltage channel 3 and the voltage channel 1, an included angle ≦ I1U1 between the current channel 1 and the voltage channel 1, an included angle ≦ I2U1 between the current channel 2 and the voltage channel 1, and an effective value of the voltage channel 1Voltage channel 2 effective valueTo calculate the correct power.

As an example of the present application, the wiring method may be further determined according to the input load information, for example, taking "voltage positive phase sequence, current positive phase sequence" vector diagram as an example, and table 5 shows 6 wiring methods corresponding to the vector diagrams, assuming that the load is known to be inductive and the power flow is positive, and the current-voltage vector diagram is determined to be "voltage positive phase sequence, current positive phase sequence", the possible range of θ 1 of each wiring method is as follows: e [0 °, 90 °), see table 5.

If the currently measured theta 1 is 50 degrees, the possible connection mode is (i) or (v);

if the currently measured theta 1 is 70 degrees, the possible connection mode is (i);

6 sets of electric energy data are saved at most, 6 sets of electric energy pulses can be output simultaneously, and the 6 sets of pulses can be used for verification and authentication of any wiring electric energy meter. During actual application, only one set of electric energy data is identified to be effective according to load information provided on site, and correct electric energy pulse can be output according to the effective electric energy data. The actual power of the current load, and the frequency of the pulses, can be calculated as a basis for verifying that the power correction is correct.

Table 5:

as an embodiment of the present application, step S40: generating electric energy data according to the wiring mode of the three-phase three-wire electric energy meter, comprising the following steps of: adjusting the phase sequence inside the electric energy meter according to the wiring mode of the three-phase three-wire electric energy meter; and calculating the electric energy data by adopting a preset electric quantity calculation formula according to the adjusted phase sequence.

As an embodiment of the present application, an electric energy metering device is further provided in the embodiment of the present application, and referring to fig. 5, an electric energy metering device 40 in the embodiment includes a wiring detection module 41, a power correction module 42, and an electric energy calculation module 43.

Specifically, the wiring detection module 41 is configured to obtain voltage vector information and current vector information of the three-phase three-wire electric energy meter in any wiring, and generate vector diagram data according to the voltage vector information and the current vector information; the power correction module 42 is configured to obtain load information, and determine a wiring manner of the three-phase three-wire electric energy meter according to the vector diagram data and the load information; the electric energy calculating module 43 is configured to generate electric energy data according to a wiring manner of the three-phase three-wire electric energy meter.

In this embodiment, after acquiring voltage and current vector information, the wiring detection module 41 acquires voltage vector information and current vector information of the three-phase three-wire electric energy meter in any wiring, and generates vector diagram data according to the voltage vector information and the current vector information; after the wiring detection module 41 determines the vector diagram, the possible wiring modes are only 6 at most, and the power correction module 42 determines the wiring mode of the three-phase three-wire electric energy meter according to the vector diagram data and the load information, that is, further screens the wiring mode according to the load information provided by the user, that is, the load power factor angle range. The power calculation module 43 outputs at least one set of power data according to the power correction module 42.

As an embodiment of the present application, the electric energy calculating module 43 is further configured to calculate a compensation electric energy according to the electric energy calculated by the adjusted phase sequence and the current electric energy of the electric energy meter.

Fig. 6 is a block diagram of a terminal device according to an embodiment of the present application. As shown in fig. 6, the terminal device 50 of this embodiment includes: a processor 51, a memory 52 and a computer program 53 stored in said memory 52 and executable on said processor 51, such as a program of an electric energy metering method. The processor 51 implements the steps of the above-mentioned embodiments of the electric energy metering method, such as S10 to S40 shown in fig. 1, when executing the computer program 53. Alternatively, when the processor 51 executes the computer program 53, the functions of the modules in the embodiment corresponding to fig. 5, for example, the functions of the modules 41 to 43 shown in fig. 5, are implemented, for which reference is specifically made to the relevant description in the embodiment corresponding to fig. 4, which is not repeated herein.

Illustratively, the computer program 53 may be divided into one or more units, which are stored in the memory 52 and executed by the processor 51 to accomplish the present application. The one or more units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program 53 in the terminal device 50. For example, the computer program 53 may be divided into a determining unit, an executing unit and a reporting unit, and the specific functions of each unit are as described above.

The terminal device may include, but is not limited to, a processor 51, a memory 52. Those skilled in the art will appreciate that fig. 5 is merely an example of a terminal device 50 and does not constitute a limitation of terminal device 50 and may include more or fewer components than shown, or some components may be combined, or different components, for example, the terminal device may also include input output devices, network access devices, buses, etc.

The Processor 51 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory 52 may be an internal storage unit of the terminal device 50, such as a hard disk or a memory of the terminal device 50. The memory 52 may also be an external storage device of the terminal device 50, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the terminal device 50. Further, the memory 52 may also include both an internal storage unit and an external storage device of the terminal device 50. The memory 52 is used for storing the computer programs and other programs and data required by the terminal device. The memory 52 may also be used to temporarily store data that has been output or is to be output.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.