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

Abstract

An embodiment of the present invention discloses a correction coefficient calculation method for a three-phase, three-wire metering device electrically connected to a three-phase access line. The calculation method includes: detecting the three-phase phase voltage vectors and two-phase phase current vectors of the three-phase, three-wire metering device under any wiring conditions; determining the actual wiring phase sequence and phase failure position of the three-phase, three-wire metering device based on the three-phase phase voltage vectors and two-phase phase current vectors; calculating the actual active power value according to a first preset rule based on the phase failure position; and determining the correction coefficient based on the actual active power value and the theoretical active power value. The technical solution provided by the embodiment of the present invention improves the efficiency and accuracy of calculating the correction coefficient of the three-phase, three-wire metering device.

Description

Technical Field

[0001] Embodiments of the present invention relate to the technical field of electric energy metering, and in particular to a correction coefficient calculation method and device based on a three-phase three-wire metering device. Background Art

[0002] The accuracy of energy metering devices directly impacts the fairness of trade settlements and the formulation of internal economic and technical indicators for power companies. During the installation and wiring of energy meters and transformers, wiring errors can occur, as can human error for the purpose of electricity theft. Therefore, mastering the analysis methods for wiring errors is particularly important for metering technicians.

[0003] At present, phase failure occurs in the metering circuit with three-phase three-wire wiring, which is a common situation in the daily operation and maintenance of metering devices. This may lead to under-calculation or omission of electricity, or even inaccurate calculation process and improper analysis, thus causing economic losses to the enterprise. Summary of the Invention

[0004] The present invention provides a correction coefficient calculation method and device based on a three-phase three-wire metering device, so as to improve the calculation efficiency and accuracy of the correction coefficient of the three-phase three-wire metering device.

[0005] In a first aspect, an embodiment of the present invention provides 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 to a three-phase access line. The calculation method includes:

[0006] Detecting the three-phase voltage vectors and two-phase current vectors of the three-phase three-wire metering device under any wiring conditions;

[0007] Determining the actual connection phase sequence and the phase failure position of the three-phase three-wire metering device according to the three-phase phase voltage vector and the two-phase phase current vector;

[0008] Calculating the actual active power value according to the phase failure position according to a first preset rule;

[0009] A correction coefficient is determined according to the actual active power value and the theoretical active power value.

[0010] 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, wherein the three-phase three-wire metering device is electrically connected to a three-phase access line, and the correction coefficient calculation device includes:

[0011] A detection module, configured to detect a three-phase voltage vector and a two-phase current vector of the three-phase three-wire metering device under any wiring conditions;

[0012] a judgment module, configured to determine an actual connection phase sequence and a phase failure position of the three-phase three-wire metering device according to the three-phase phase voltage vector and the two-phase phase current vector;

[0013] The calculation module is used to calculate the actual active power value according to the phase failure position according to a first preset rule, and determine a correction coefficient according to the actual active power value and a theoretical active power value.

[0014] In a third aspect, an embodiment of the present invention further provides an electronic device, including:

[0015] one or more processors;

[0016] a storage device for storing one or more programs;

[0017] When the one or more programs are executed by the one or more processors, the one or more processors implement the correction coefficient calculation method based on the three-phase three-wire metering device described in the first aspect.

[0018] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the correction coefficient calculation method based on a three-phase three-wire metering device described in the first aspect when executed.

[0019] The technical solution of the embodiment of the present invention detects the three-phase phase voltage vectors and two-phase phase current vectors of a three-phase, three-wire metering device under any wiring conditions, performs analysis and processing to determine the actual wiring phase sequence and phase failure position of the three-phase, three-wire metering device. The determined phase failure position is then used to calculate the actual active power value according to a first preset rule, and a correction factor is then determined based on the actual active power value and the theoretical active power value. This improves the efficiency and accuracy of calculating the correction factor for the three-phase, three-wire metering device, particularly the efficiency and accuracy of analyzing and processing the three-phase, three-wire metering device in the event of a phase failure, thereby avoiding losses and safety accidents.

[0020] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A flowchart of a correction coefficient calculation method based on a three-phase three-wire metering device provided by an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of a wiring connection method of a three-phase three-wire metering device provided in an embodiment of the present invention;

[0024] Figure 3 A flowchart of another correction coefficient calculation method based on a three-phase three-wire metering device provided by an embodiment of the present invention;

[0025] Figure 4 A voltage-current vector relationship diagram provided by an embodiment of the present invention;

[0026] Figure 5 Another voltage-current vector relationship diagram provided by an embodiment of the present invention;

[0027] Figure 6 A flowchart of another correction coefficient calculation method based on a three-phase three-wire metering device provided in an embodiment of the present invention;

[0028] Figure 7 A voltage equivalent circuit diagram of a basic metering unit in a three-phase three-wire metering device provided by an embodiment of the present invention;

[0029] Figure 8 A voltage and current vector parameter diagram of a three-phase three-wire connection under correct wiring according to an embodiment of the present invention;

[0030] Figure 9 A flowchart of another correction coefficient calculation method based on a three-phase three-wire metering device provided in an embodiment of the present invention;

[0031] Figure 10 A schematic structural diagram of a correction coefficient calculation device based on a three-phase three-wire metering device provided by an embodiment of the present invention;

[0032] Figure 11 A schematic structural diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] Figure 1 A flowchart of a correction coefficient calculation method based on a three-phase three-wire metering device provided in an embodiment of the present invention is shown in FIG. Figure 1 As shown, the calculation method includes:

[0036] S101. Detecting three-phase voltage vectors and two-phase current vectors of a three-phase three-wire metering device under arbitrary wiring.

[0037] Understandably, Figure 2 A schematic diagram of a wiring connection method of a three-phase three-wire metering device provided in an embodiment of the present invention, wherein the three-phase three-wire metering device is electrically connected to the three-phase access line ABC, wherein the power 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. When the three-phase three-wire metering device is correctly connected, the voltage of phase A is catch Phase B voltage Grounding and parallel connection Phase C voltage catch Phase A current catch Phase C current catch, and The first component, and The second element is formed, and this satisfies However, when the three-phase three-wire metering device is connected incorrectly or disconnected, the above equations will no longer be satisfied at the same time, that is, the voltage or current connected to the first element and the second element may not be the correct voltage or current. and And the two-phase current vector and Further analysis can be used to determine whether the three-phase three-wire metering device has wiring errors, especially phase failure caused by disconnected wiring.

[0038] S102: Determine the actual connection phase sequence and the phase failure position of the three-phase three-wire metering device according to the three-phase phase voltage vector and the two-phase phase current vector.

[0039] Specifically, refer to Figure 2 , when the three-phase three-wire metering device is correctly connected, the three-phase phase voltage vector and should correspond to and in, The voltage amplitude is zero, and The voltage of the two phases is the same, and the current vectors of the two phases and Corresponding to and and and The angle between and The angles between them are the same. Once the three-phase voltage vectors are actually detected and And the two-phase current vector and If the relationship under the condition of correct wiring is not satisfied, the voltage value can be directly observed or the three-phase voltage vector can be used to calculate the voltage. and And the two-phase current vector and The obtained voltage-current vector relationship diagram is used to determine the actual connection phase sequence and the position of the phase failure of the three-phase, three-wire metering device. It should be noted that when determining the actual connection phase sequence and the position of the phase failure of the three-phase, three-wire metering device based on the voltage-current vector relationship diagram, a further determination can be made based on the angle between the two-phase current vectors being 120 degrees to accurately determine the position of the phase failure.

[0040] S103: Calculate the actual active power value according to the first preset rule based on the phase failure position.

[0041] Among them, the first preset rule can be a calculation model for electricity metering in a preset three-phase three-wire metering device, such as a calculation formula for actual voltage. It can be understood that the first preset rule will be different depending on the phase failure position, and the embodiment of the present invention does not make specific limitations here.

[0042] Understandable, reference Figure 2, when the three-phase three-wire metering device is connected correctly, the power P1 measured by the first element is Among them, U ab is the line voltage amplitude, I a is the a-phase current value, For U ab with I a The power P2 measured by the second element is Among them, U cb is the line voltage amplitude, I c is the c-phase current value, For U cb with I c Therefore, the actual active power value P of the three-phase three-wire metering device is P=P1+P2.

[0043] In this way, after determining the specific phase-break position of the connection line of the three-phase three-wire metering device, the actual measured voltage, current and other parameters can be determined according to the corresponding calculation formula, and then the actual active power value can be further calculated.

[0044] S104: Determine a correction coefficient according to the actual active power value and the theoretical active power value.

[0045] Specifically, the correction factor refers to the correction factor for incorrect wiring. It's the power value that the meter should measure under a correctly wired condition at the same power factor. Specifically, it's the ratio of the theoretical active power value to the actual active power value measured due to incorrect wiring. Furthermore, once the correction factor is determined, the amount of electricity to be refunded and the electricity cost can be calculated based on the correction factor.

[0046] In this embodiment, by detecting the three-phase phase voltage vectors and two-phase phase current vectors of a three-phase, three-wire metering device under any wiring conditions and performing analysis and processing, the actual wiring phase sequence and phase failure position of the three-phase, three-wire metering device can be determined. The actual active power value can then be calculated based on the determined phase failure position according to a first preset rule, and a correction factor can be determined based on the actual active power value and the theoretical active power value. This improves the efficiency and accuracy of calculating the correction factor for the three-phase, three-wire metering device, particularly the efficiency and accuracy of analyzing and processing the three-phase, three-wire metering device in the event of a phase failure, thereby avoiding losses and safety accidents.

[0047] Optional, Figure 3 A flowchart of another correction coefficient calculation method based on a three-phase three-wire metering device provided by an embodiment of the present invention is shown in FIG. Figure 3As shown, the actual connection phase sequence and phase failure position of the three-phase three-wire metering device are determined based on the three-phase phase voltage vector and the two-phase phase current vector, including: determining the reference voltage vector and the phase voltage vector corresponding to the actual grounding of the three-phase three-wire metering device based on the three-phase phase voltage vector, the amplitude of the reference voltage vector is equal to the phase voltage amplitude measured when the three-phase three-wire metering device is correctly connected; detecting the angles between the two-phase phase current vectors and the reference voltage vector respectively; determining the line voltage vector corresponding to the reference voltage vector based on the reference voltage vector and the phase voltage vector corresponding to the actual grounding of the three-phase three-wire metering device; determining the voltage and current vector parameter diagram based on the line voltage vector corresponding to the reference voltage vector, the two-phase phase current vector, and the angles between the two-phase phase current vectors and the reference voltage vector respectively; and determining the actual connection phase sequence and phase failure position of the three-phase three-wire metering device based on the voltage and current vector parameter diagram satisfying the second preset rule. Therefore, the correction coefficient calculation method includes the following steps:

[0048] S301. Detecting three-phase voltage vectors and two-phase current vectors of a three-phase three-wire metering device under arbitrary wiring.

[0049] S302. Determine 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 phase voltage vector, wherein the amplitude of the reference voltage vector is equal to the phase voltage amplitude measured when the three-phase three-wire metering device is correctly connected.

[0050] Specifically, the detected three-phase voltage vector and The amplitude is compared with the theoretical voltage amplitude (i.e. the phase voltage amplitude measured by the three-phase three-wire metering device when it is correctly connected), and the three-phase phase voltage vector and The phase voltage vector whose amplitude is equal to the theoretical voltage amplitude is the reference voltage vector. and The phase voltage vector with zero amplitude is determined as the actual grounded phase in the three-phase three-wire metering device, that is, Figure 2 Phase b in.

[0051] S303: Detect the angles between the two-phase current vectors and the reference voltage vector.

[0052] Specifically, after determining the reference voltage vector, the two-phase current vectors can be further detected. and The angles they make with the reference voltage vector respectively.

[0053] S304 : Determine 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.

[0054] Specifically, since the reference voltage vector corresponds to the voltage of the phase connection to the ground, after determining the phase voltage vector corresponding to the actual grounding of the three-phase three-wire metering device, the line voltage vector composed of the reference voltage vector and the actual grounded phase can be obtained.

[0055] For example, the reference voltage vector is The actual grounded phase of the three-phase three-wire metering device is phase b, so the line voltage vector corresponding to the reference voltage vector is In uncertainty In case of phase a or phase c, Possibly or

[0056] Therefore, based on 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. At the same time, combined with the analysis of the actual situation, the line voltage vector may be a definite line voltage vector or two uncertain line voltage vectors. When the specific line voltage vector is uncertain, it can be further analyzed and determined through the voltage-current vector relationship diagram.

[0057] S305 : Determine a voltage-current vector parameter diagram according to the line voltage vector corresponding to the reference voltage vector, the two-phase current vectors, and the angles between the two-phase current vectors and the reference voltage vector.

[0058] Specifically, all cases of line voltage vectors corresponding to the reference voltage vector can be listed one by one. Then, based on different line voltage vectors, two-phase current vectors, and the angles between the two-phase current vectors and the reference voltage vector, multiple voltage and current vector parameter diagrams can be obtained. It should be noted that after the line voltage vector corresponding to the reference voltage vector is determined, the angles between the two-phase current vectors and the reference voltage vector are the angles between the two-phase current vectors and the line voltage vector.

[0059] It is understandable that when determining the voltage and current vector parameter diagram, it is also necessary to determine in advance whether the phase sequence of the voltage is positive phase sequence or reverse phase sequence, so as to more accurately determine the two-phase current vector in the voltage and current vector parameter diagram. and The angles between them and the reference voltage vector are used to avoid errors in the voltage and current vector parameter diagram, which will affect further analysis and processing.

[0060] S306: When the voltage and current vector parameter diagram satisfies a second preset rule, determine the actual connection phase sequence and the phase failure position of the three-phase three-wire metering device.

[0061] Optionally, the second preset rule includes that the current polarity of the two-phase current vectors in the voltage-current vector parameter diagram is the same and the angle is 120 degrees, and that the angle between the voltage vector and the current vector of the same phase is less than 60 degrees. It is understandable that the second preset rule also includes that the amplitude of the two-phase current vectors is the same, etc., which will not be explained here one by one. Those skilled in the art can make judgments one by one based on the rules that the voltage-current vector parameter diagram must meet to determine the correct voltage-current vector parameter diagram that meets all second preset rules, and then determine that the line voltage vector corresponding to the voltage-current vector parameter diagram is correct. Then, based on the reference voltage vector, the actual phase voltage vector is determined, that is, the phase that is not disconnected, thereby determining that the other phase is the phase that has a disconnection. In addition, the voltage-current vector parameter diagram can also be used to determine whether the actual wiring phase sequence at this time is correct.

[0062] S307: Calculate the actual active power value according to the first preset rule based on the phase failure position.

[0063] S308. Determine a correction coefficient according to the actual active power value and the theoretical active power value.

[0064] The following is a specific example to illustrate that the detected three-phase voltage vector and The corresponding amplitudes are 26V, 0V and 100V respectively. It is known that the voltage read by the three-phase three-wire metering device is 100V when it is correctly wired. As the reference voltage vector, the two-phase current vector is further measured and Respectively The angles are 110° and 350° respectively. The amplitude is 0V, so That is, the actual grounding phase b of the three-phase three-wire metering device, and then we can determine at this time, Possibly or Assumptions Then the two-phase current vector and Respectively The included angles are 110° and 350°, and the two-phase current vectors can be obtained. and The actual relative The position of the corresponding voltage and current vector parameter diagram is Figure 4 As shown. Assume that Then the two-phase current vector and Respectively The included angles are 110° and 350°, and the two-phase current vectors can be obtained. and The actual relative The position of the corresponding voltage and current vector parameter diagram is Figure 5 Further references Figure 4 and Figure 5 As shown, assuming because Figure 4 The phase current vector in the voltage and current vector parameter diagram and The angle between the phase current vectors is greater than 60 degrees. and The angle is greater than 60 degrees, which does not meet the second preset rule. Figure 5 The phase current vector in the voltage and current vector parameter diagram and The angle between the phase current vectors is less than 60 degrees. and The angle is less than 60 degrees, so it can be determined That is the actual c phase, and then we can determine That is the actual phase a, and it is the broken phase.

[0065] Optional, Figure 6 A flowchart of another correction coefficient calculation method based on a three-phase three-wire metering device provided in an embodiment of the present invention is shown in FIG. Figure 6 As shown, the actual active power value is calculated according to the first preset rule based on the phase failure position, including: determining the voltage equivalent circuit based on the basic metering unit in the three-phase three-wire metering device; determining the actual voltage value measured by the first component and the actual voltage value measured by the second component in the basic metering unit based on the voltage equivalent circuit and the phase failure position; and calculating the actual active power value using the active power calculation formula based on the actual voltage value measured by the first component, the actual voltage value measured by the second component, and the two-phase current vector. Therefore, the correction coefficient calculation method includes the following steps:

[0066] S601. Detecting three-phase voltage vectors and two-phase current vectors of a three-phase three-wire metering device under arbitrary wiring.

[0067] S602: Determine the actual connection phase sequence and the phase failure position of the three-phase three-wire metering device according to the three-phase phase voltage vector and the two-phase phase current vector.

[0068] S603: Determine a voltage equivalent circuit according to a basic metering unit in the three-phase three-wire metering device.

[0069] Specifically, Figure 7 The voltage equivalent circuit diagram of the basic metering unit in a three-phase three-wire metering device provided by an embodiment of the present invention is as follows: Figure 7As shown, 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 phase b voltage input terminals, a second resistor R2 and a third resistor R3 connected in parallel between the phase b and phase c voltage input terminals, and a fourth resistor R4 connected in parallel between the phase a and phase c voltage input terminals. The first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 have the same resistance value. When 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 the same, for example, 100V.

[0070] S604: Determine the actual voltage value measured by the first component and the actual voltage value measured by the second component in the basic measurement unit according to the voltage equivalent circuit and the phase failure position.

[0071] Continue to refer Figure 2 As shown, the phase-break position includes the primary side of the voltage transformer or the secondary side of the voltage transformer, wherein the primary side of the voltage transformer is the side electrically connected to the access line, and the secondary side of the voltage transformer is the side electrically connected to the basic metering unit.

[0072] For example, the phase failure position is phase A on the secondary side of the voltage transformer. Figure 7 The voltage equivalent circuit shown can determine the actual voltage value U measured by the first element in the three-phase three-wire metering device. ab Should be The actual voltage value U measured by the second element cb For U cb = U0, where U0 is the voltage between each two phases when the three-phase three-wire metering device is correctly wired and the voltage provided by the access line ABC is balanced. Alternatively, if the phase failure position is phase B on the secondary side of the voltage transformer, the actual voltage value U measured by the first element is ab for The actual voltage value U measured by the second element cb for

[0073] In addition, taking the case where the three-phase three-wire metering device is correctly wired and the voltage provided by the access line ABC is balanced, and the voltage value between each two phases is 100, if a phase fuse on the primary side of the voltage transformer is blown, the secondary side voltage value will also change accordingly, and the change range is generally 0V, 50V or 100V. For example, when the primary side phase A is disconnected, U ab =0V, U cb =U ca =100V; When the primary side B phase is disconnected, it is equivalent to adding a single-phase 100V power supply between the AC phases, so U ab =U cb= 50 V. It is understood that those skilled in the art can use a voltage equivalent circuit to determine the actual voltage value measured by the first element and the actual voltage value measured by the second element when a phase failure occurs in any phase based on the voltage value between each two phases of the three-phase three-wire metering device when the wiring is correct and the voltage provided by the connected lines ABC is balanced. Examples of this will not be given one by one in the present embodiment.

[0074] S605 , calculating the actual active power value 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 vectors.

[0075] Specifically, Figure 8 The voltage and current vector parameter diagram of a three-phase three-wire connection under correct connection is provided by the embodiment of the present invention, combined with Figure 2 and Figure 8 As shown, the actual voltage value measured by the first element is U ab , the actual voltage value measured by the second element is U cb , the current values ​​corresponding to the two-phase current vectors are I a and I c , and then use the active power calculation formula to calculate the actual active power value P:

[0076]

[0077] Among them, I a is the current value of phase a, I c is the c-phase current value, For U ab with I a The angle of For U cb with I c Angle.

[0078] It can be understood that when the load electrically connected to the access line ABC is a balanced load, and The angles are the same, and a unified express.

[0079] S606: Determine a correction coefficient according to the actual active power value and the theoretical active power value.

[0080] The correction coefficient K is determined based on the actual active power value and the theoretical active power value. The correction coefficient K can be determined according to the following formula:

[0081]

[0082] Among them, P0 is the theoretical active power value, P is the actual active power value, U is the phase voltage amplitude, I is the phase voltage amplitude, Uab is the line voltage amplitude, U cb is the line voltage amplitude, I a is the current value of phase a, I c is the c-phase current value, For U ab with I a The angle of For U cb with I c The angle of is the angle between U and I.

[0083] Optional, Figure 9 A flowchart of another correction coefficient calculation method based on a three-phase three-wire metering device provided in an embodiment of the present invention is shown in FIG. Figure 9 As shown, after determining the correction coefficient based on the actual active power value and the theoretical active power value, the method further includes: obtaining the erroneous electric energy value when the three-phase three-wire metering device is disconnected; and determining the amount of electricity to be compensated and the refund fee based on the correction coefficient and the erroneous electric energy value. Therefore, the correction coefficient calculation method includes the following steps:

[0084] S901. Detect the three-phase voltage vectors and two-phase current vectors of the three-phase three-wire metering device under arbitrary wiring.

[0085] S902: Determine the actual connection phase sequence and the phase failure position of the three-phase three-wire metering device according to the three-phase phase voltage vector and the two-phase phase current vector.

[0086] S903: Calculate the actual active power value according to the first preset rule based on the phase failure position.

[0087] S904: Determine a correction coefficient according to the actual active power value and the theoretical active power value.

[0088] S905: Obtain an erroneous electric energy value when the three-phase three-wire metering device is disconnected from the phase.

[0089] S906: Determine the amount of electricity to be compensated and the refund fee based on the correction coefficient and the erroneous electric energy value.

[0090] Specifically, the purpose of calculating the correction coefficient for a three-phase three-wire metering device is to calculate the corrected energy by calculating the correction coefficient and the erroneous energy value when the three-phase three-wire metering device is disconnected, and to refund the overpaid electricity bill or make up the underpaid electricity bill, thereby reducing the losses of the enterprise or the power grid company. The calculation formula for the corrected energy ΔW is usually ΔW = (K-1)W e , where W e This is the erroneous electric energy value when a three-phase three-wire metering device has a phase failure.

[0091] Based on the same inventive concept, an embodiment of the present invention further provides a correction coefficient calculation device based on a three-phase three-wire metering device. Figure 10 A schematic diagram of a correction coefficient calculation device based on a three-phase three-wire metering device according to an embodiment of the present invention is provided. Figure 2 and Figure 10 As shown, a three-phase three-wire metering device is electrically connected to a three-phase access line ABC, and is characterized in that a correction coefficient calculation device includes: a detection module 10, used to detect the three-phase phase voltage vector and the two-phase phase current vector of the three-phase three-wire metering device under arbitrary connection; a judgment module 20, used to determine the actual connection phase sequence and the phase failure position of the three-phase three-wire metering device according to the three-phase phase voltage vector and the two-phase phase current vector; a calculation module 30, used to calculate the actual active power value according to the first preset rule based on the phase failure position, and determine the correction coefficient according to the actual active power value and the theoretical active power value.

[0092] In this embodiment, the detection module 10 detects the three-phase phase voltage vectors and two-phase phase current vectors of a three-phase, three-wire metering device under any wiring conditions. The judgment module 20 then performs analysis and processing to determine the actual wiring phase sequence and phase failure location of the three-phase, three-wire metering device. The calculation module 30 then calculates the actual active power value based on the determined phase failure location according to a first preset rule and determines a correction factor based on the actual active power value and the theoretical active power value. In this way, the correction factor calculation device can improve the calculation efficiency and accuracy of the correction factor for the three-phase, three-wire metering device, especially the efficiency and accuracy of the analysis and processing of the three-phase, three-wire metering device in the event of a phase failure, thereby avoiding losses and safety accidents.

[0093] Optionally, the three-phase three-wire metering device includes an electrically connected voltage transformer and a basic metering unit; the phase-off position of the three-phase three-wire metering device includes being located on the primary side of the voltage transformer or on the secondary side of the voltage transformer, wherein the primary side of the voltage transformer is the side electrically connected to the access line, and the secondary side of the voltage transformer is the side electrically connected to the basic metering unit.

[0094] An embodiment of the present invention further provides an electronic device, Figure 11 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention is shown in FIG. Figure 11 As shown, the electronic device includes a display terminal 100; the display terminal includes at least one processor 101; and a memory 102 communicatively connected to the at least one processor 101; wherein 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 to enable the at least one processor 101 to execute the correction coefficient calculation method based on the three-phase three-wire metering device in any of the above embodiments.

[0095] Specifically, the electronic device may further include an input device 103 and an output device 104 .

[0096] The processor 101, memory 102, input device 103 and output device 104 in the electronic device can be connected through a bus or other means. Figure 11 The bus connection is taken as an example.

[0097] The memory 102 in the electronic device serves as a computer-readable storage medium and can be used to store one or more programs. These programs can be software programs, computer-executable programs, and modules, such as the program instructions / modules corresponding to the correction coefficient calculation method for a three-phase, three-wire metering device provided in the embodiments of the present invention. The processor 101 executes the software programs, instructions, and modules stored in the memory 102 to execute various functional applications and data processing of the electronic device, thereby implementing the correction coefficient calculation method for a three-phase, three-wire metering device provided in the above-described method embodiment.

[0098] The memory 102 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and applications required for at least one function; the data storage area may store data created based on the use of the electronic device, etc. In addition, the memory 102 may include a high-speed random access memory and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some instances, the memory 102 may further include a memory remotely located relative to the processor 101, and these remote memories may be connected to the device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0099] The input device 103 may be used to receive input digital or character information and generate key signal input related to user settings and function control of the electronic device. The output device 104 may include a display device such as a display screen.

[0100] Furthermore, when one or more programs included in the electronic device are executed by one or more processors 101, the programs perform the following operations:

[0101] Detect the three-phase voltage vector and two-phase current vector of the three-phase three-wire metering device under any wiring;

[0102] Determine the actual connection phase sequence and phase failure position of the three-phase three-wire metering device based on the three-phase phase voltage vector and the two-phase phase current vector;

[0103] Calculating the actual active power value according to the first preset rule based on the phase failure position;

[0104] The correction coefficient is determined based on the actual active power value and the theoretical active power value.

[0105] Of course, those skilled in the art will understand that when one or more programs included in the above-mentioned electronic device are executed by one or more processors 101, the program can also perform relevant operations in the correction coefficient calculation method based on the three-phase three-wire metering device provided in any embodiment of the present invention.

[0106] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon. The program is executed by a processor and is based on a correction coefficient calculation method for a three-phase three-wire metering device. The method includes:

[0107] Detect the three-phase voltage vector and two-phase current vector of the three-phase three-wire metering device under any wiring;

[0108] Determine the actual connection phase sequence and phase failure position of the three-phase three-wire metering device based on the three-phase phase voltage vector and the two-phase phase current vector;

[0109] Calculating the actual active power value according to the first preset rule based on the phase failure position;

[0110] The correction coefficient is determined based on the actual active power value and the theoretical active power value.

[0111] The computer storage medium of the embodiment of the present invention may adopt 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. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or component, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, 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 thereof. The computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, device or device.

[0112] A computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such a propagated data signal may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0113] The program code contained on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wire, optical cable, radio frequency (RF), etc., or any suitable combination of the foregoing.

[0114] Computer program code for performing the operations of the present invention may be written in one or more programming languages, or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving 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 may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0115] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. 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 to a three-phase access line, characterized in that: The calculation method includes: Detecting the three-phase voltage vectors and two-phase current vectors of the three-phase three-wire metering device under any wiring conditions; Determining the actual connection phase sequence and the phase failure position of the three-phase three-wire metering device according to the three-phase phase voltage vector and the two-phase phase current vector; Calculating the actual active power value according to the phase failure position according to a first preset rule; determining a correction coefficient according to the actual active power value and the theoretical active power value; Wherein, determining the actual connection phase sequence and the phase failure position of the three-phase three-wire metering device according to the three-phase phase voltage vector and the two-phase 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 based on the three-phase phase voltage vector, wherein the amplitude of the reference voltage vector is equal to the phase voltage amplitude measured when the three-phase three-wire metering device is correctly connected; detecting angles between the two-phase current vectors and the reference voltage vector respectively; determining a line voltage vector corresponding to the reference voltage vector based on the reference voltage vector and a phase voltage vector corresponding to the actual grounding of the three-phase three-wire metering device; Determine a voltage-current vector parameter diagram according to the line voltage vector corresponding to the reference voltage vector, the two-phase current vectors, and the angles between the two-phase current vectors and the reference voltage vector; When the voltage and current vector parameter diagram satisfies a second preset rule, an actual wiring phase sequence and a phase failure position of the three-phase three-wire metering device are determined.

2. The correction coefficient calculation method according to claim 1, characterized in that: The second preset rule includes: the current polarities of the two-phase current vectors 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 less than 60 degrees.

3. The correction coefficient calculation method according to claim 1, characterized in that: Calculating the actual active power value according to the 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 component and an actual voltage value measured by a second component in the basic metering unit according to the voltage equivalent circuit and the open phase position; The actual active power value is calculated 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.

4. The correction coefficient calculation method according to claim 1, characterized in that: Determining a correction coefficient according to the actual active power value and the theoretical active power value includes: The correction factor K is determined according to the following formula: Among them, P0 is the theoretical active power value, P is the actual active power value, U is the phase voltage amplitude, I is the phase voltage amplitude, U ab is the line voltage amplitude, U cb is the line voltage amplitude, I a is the a-phase current value, I c is the c-phase current value, For U ab with I a The angle of For U cb with I c The angle of is the angle between U and I.

5. The correction coefficient calculation method according to claim 1, characterized in that: After determining the correction coefficient according to the actual active power value and the theoretical active power value, the method further includes: Obtaining an erroneous electric energy value when the three-phase three-wire metering device is disconnected from the phase; The amount of electricity to be compensated and the fee for refunding the compensation are determined according to the correction coefficient and the erroneous electric energy value.

6. A correction coefficient calculation device based on a three-phase three-wire metering device, wherein the three-phase three-wire metering device is electrically connected to a three-phase access line, characterized in that: The correction coefficient calculation device includes: A detection module, configured to detect a three-phase voltage vector and a two-phase current vector of the three-phase three-wire metering device under any wiring conditions; a judgment module, configured to determine, based on the three-phase phase voltage vector and the two-phase phase current vector, an actual connection phase sequence and a phase-break position of the three-phase three-wire metering device; determining, based on the three-phase phase voltage vector and the two-phase phase current vector, the actual connection phase sequence and phase-break position of the three-phase three-wire metering device, comprising: determining, based on the three-phase phase voltage vector, a reference voltage vector and a phase voltage vector corresponding to the actual grounding of the three-phase three-wire metering device, wherein the amplitude of the reference voltage vector is equal to the phase voltage amplitude measured when the three-phase three-wire metering device is correctly connected; detecting the angles between the two-phase phase current vectors and the reference voltage vector; determining, based on the reference voltage vector and the phase voltage vector corresponding to the actual grounding of the three-phase three-wire metering device, a line voltage vector corresponding to the reference voltage vector; determining a voltage-current vector parameter diagram based on the line voltage vector corresponding to the reference voltage vector, the two-phase phase current vectors, and the angles between the two-phase phase current vectors and the reference voltage vector; and determining, based on the voltage-current vector parameter diagram satisfying a second preset rule, the actual connection phase sequence and phase-break position of the three-phase three-wire metering device; The calculation module is used to calculate the actual active power value according to the phase failure position according to a first preset rule, and determine a correction coefficient according to the actual active power value and a theoretical active power value.

7. The correction coefficient calculation device according to claim 6, characterized in that: The three-phase three-wire metering device includes an electrically connected voltage transformer and a basic metering unit; The phase-off position of the three-phase three-wire metering device includes being located on the primary side of the voltage transformer or on the secondary side of the voltage transformer, wherein the primary side of the voltage transformer is the side electrically connected to the access line, and the secondary side of the voltage transformer is the side electrically connected to the basic metering unit.

8. An electronic device, characterized in that: include: one or more processors; a storage device for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the correction coefficient calculation method based on a three-phase three-wire metering device as described in any one of claims 1 to 5.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the correction coefficient calculation method based on a three-phase three-wire metering device according to any one of claims 1 to 5 when executed.

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