Power distribution system, detection method of current transformer and inverter

Abstract

The invention discloses a power distribution system, a current transformer detection method and an inverter. The power distribution system comprises an inverter, a three-phase electric meter, and a current transformer and a voltage sampling unit which are respectively arranged on different phases of home-entry lines of a three-phase power grid, the inverter is configured to output corresponding preset first target power of each phase under at least two current angles in sequence according to a current phasor rotation mode for each phase of home-entry line; under each current angle, power corresponding to the three-phase home-entry line is obtained; determining a second target power corresponding to each phase from all the powers, and recording a first serial number of the current transformer corresponding to each second target power; determining a target voltage corresponding to the first target power of each phase and a second sequence number corresponding to the target voltage from the voltages collected on the three-phase home-entry line; and outputting adjustment suggestion information according to the first serial number and the second serial number. In this way, the adjustment suggestion information of the current transformer can be provided.

Description

Technical Field

[0001] This application relates to the field of current transformer testing technology, and particularly to power distribution systems, current transformer testing methods, and inverters. Background Technology

[0002] In existing power distribution systems, the inverter's self-testing scheme, in conjunction with the three-phase meter, can only alert the user that the three-phase meter connection is incorrect when the current transformer corresponding to the three-phase meter is connected to the wrong phase. The user does not know which phase is connected incorrectly, nor can the system provide the user with correct connection advice. Summary of the Invention

[0003] This application provides a power distribution system, a testing method for current transformers, and an inverter, and can provide correct adjustment suggestions for current transformers.

[0004] To solve the above-mentioned technical problems, one technical solution adopted in this application is: providing a power distribution system connected to a three-phase power grid, the power distribution system comprising: a first current transformer, a second current transformer, and a third current transformer, respectively installed on different phase incoming lines of the three-phase power grid, configured to collect the current on the three-phase incoming lines; a first voltage sampling unit, a second voltage sampling unit, and a third voltage sampling unit, respectively connected to different phase incoming lines of the three-phase power grid, configured to collect the voltage on the three-phase incoming lines; a three-phase electricity meter, communicatively connected to the first current transformer, the second current transformer, the third current transformer, the first voltage sampling unit, the second voltage sampling unit, and the third voltage sampling unit, configured to receive the current and voltage on the three-phase incoming lines; and an inverter, installed on any one phase of the three-phase power grid's indoor line, or installed on all three phases of the three-phase power grid's indoor line, communicatively connected to the three-phase electricity meter, configured to: for each phase incoming line of the three-phase power grid, sequentially, according to the current phasor rotation method, at least two At each current angle, the first target power corresponding to each phase is output; at each current angle, the power corresponding to each of the three-phase incoming lines is acquired; wherein, the power of each phase incoming line is calculated from the current collected by its corresponding current transformer and the voltage collected by its corresponding voltage sampling unit; from all the power corresponding to the three-phase incoming lines, the second target power corresponding to each phase is determined, and the first serial number of the current transformer corresponding to each second target power is recorded; wherein, the second target power is the power of a phase incoming line whose change in power at least at two current angles meets the preset difference expectation; and from the voltage collected on the three-phase incoming lines, the target voltage corresponding to the first target power of each phase is determined, and the second serial number corresponding to the target voltage is recorded; wherein, the phase corresponding to the target voltage matches the phase corresponding to the voltage of the first target power; based on the first serial number and the second serial number, adjustment suggestion information for adjusting the first current transformer, the second current transformer, and the third current transformer is output.

[0005] The first target power includes active power and reactive power. The inverter is also configured to: for each phase of the incoming line, according to the current phasor rotation method, output the first active power and the first reactive power when the current angle is a first preset angle; acquire the second active power and the second reactive power corresponding to each phase of the three-phase incoming line; output the third active power and the third reactive power when the current angle is a first preset angle; wherein the third active power is different from the first active power, and the third reactive power is different from the first reactive power; acquire the fourth active power and the fourth reactive power corresponding to each phase of the three-phase incoming line; determine the second target power corresponding to the first active power or the third active power based on the second active power and the second reactive power, and the fourth active power and the fourth reactive power corresponding to each phase of the incoming line, and record the first serial number of the current transformer corresponding to the second target power; wherein the second target power corresponds to the active power and reactive power of the incoming line.

[0006] The inverter is further configured to: for each phase of the incoming line, according to the current phasor rotation method, output a first active power and a first reactive power when the current angle is a second preset angle; the second preset angle is a preset angle added to the first preset angle; acquire the second active power and the second reactive power corresponding to each phase of the three-phase incoming line; output a third active power and a third reactive power when the current angle is a second preset angle; wherein the third active power is different from the first active power, and the third reactive power is different from the first reactive power; acquire the fourth active power and the fourth reactive power corresponding to each phase of the three-phase incoming line; determine the second target power corresponding to the first active power or the third active power based on the second active power and the second reactive power, and the fourth active power and the fourth reactive power corresponding to each phase of the incoming line, and record the first serial number of the current transformer corresponding to the second target power; wherein the second target power corresponds to the active power and reactive power of the incoming line.

[0007] The inverter is further configured to: for each phase of the incoming line, according to the current phasor rotation method, output the first active power and the first reactive power when the current angle is a third preset angle; the third preset angle is a preset angle added to the second preset angle; acquire the second active power and the second reactive power corresponding to each phase of the three-phase incoming line; output the third active power and the third reactive power when the current angle is a third preset angle; wherein the third active power is different from the first active power, and the third reactive power is different from the first reactive power; acquire the fourth active power and the fourth reactive power corresponding to each phase of the three-phase incoming line; determine the second target power corresponding to the first active power or the third active power based on the second active power and the second reactive power, and the fourth active power and the fourth reactive power corresponding to each phase of the incoming line, and record the first serial number of the current transformer corresponding to the second target power; wherein the second target power corresponds to the active power and reactive power of the incoming line.

[0008] The inverter is further configured to: acquire the first power change gradient of the current transformer corresponding to the first-sequence current transformer in the household line, and the second power change gradient of the current-phase household line; when the first power change gradient and the second power change gradient do not match, generate a first adjustment suggestion; wherein the first adjustment suggestion is: to reverse the current transformer on the current transformer in the household line corresponding to the first-sequence current transformer in the corresponding phase of the household line.

[0009] The inverter is also configured to generate a second adjustment suggestion when the first sequence number and the second sequence number are different; the second adjustment suggestion is to swap the current transformer on the incoming line of the phase corresponding to the first sequence number and the current transformer on the incoming line of the phase corresponding to the second sequence number.

[0010] To solve the above-mentioned technical problems, another technical solution adopted in this application is: providing a method for detecting current transformers, applied to a power distribution system connected to a three-phase power grid. The power distribution system includes an inverter, a first current transformer, a second current transformer, a third current transformer, a first voltage sampling unit, a second voltage sampling unit, a third voltage sampling unit, and a three-phase meter; the inverter is installed on any one phase of the three-phase power grid's indoor line, or on the first phase, second phase, and third phase of the three-phase power grid's indoor line; the first current transformer, the second current transformer, the third ... Three current transformers are installed on different phases of the three-phase power grid's incoming lines and are configured to collect the current on each of the three phases. A first voltage sampling unit, a second voltage sampling unit, and a third voltage sampling unit are connected to different phases of the three-phase power grid's incoming lines and are configured to collect the voltage on each of the three phases. A three-phase electricity meter is communicatively connected to the first current transformer, the second current transformer, the third current transformer, the first voltage sampling unit, the second voltage sampling unit, the third voltage sampling unit, and the inverter, and is configured to receive the current and voltage on the three phases of the incoming lines. (Detection) The method includes: for each phase of the three-phase grid's incoming line, the inverter outputs a preset first target power corresponding to each phase at at least two current angles, according to the current phasor rotation method; the inverter acquires the power corresponding to each of the three phases of the incoming line at each current angle; wherein, the power of each phase of the incoming line is calculated from the current collected by its corresponding current transformer and the voltage collected by its corresponding voltage sampling unit; the inverter determines the second target power corresponding to each of the three phases of the incoming line from all the power values ​​corresponding to each phase, and records the second target power corresponding to each phase. The first serial number of the current transformer; wherein, the second target power is the power of a single-phase incoming line at at least two current angles, the power whose change meets the preset difference expectation; the inverter determines the target voltage corresponding to the first target power of each phase from the voltage collected from the three-phase incoming line, and records the second serial number corresponding to the target voltage; wherein, the phase corresponding to the target voltage matches the phase of the voltage corresponding to the first target power; the inverter outputs adjustment suggestion information for adjusting the first current transformer, the second current transformer and the third current transformer according to the first serial number and the second serial number.

[0011] The first target power includes active power and reactive power. The inverter, for each phase of the three-phase power grid, outputs the corresponding preset first target power at at least two current angles according to the current phasor rotation method. This includes: for each phase of the power grid, according to the current phasor rotation method, outputting the corresponding first active power and first reactive power at a current angle of a first preset angle, a second preset angle, or a third preset angle; wherein the second preset angle is the first preset angle plus a preset angle; and the third preset angle is the second preset angle plus a preset angle; and obtaining the second active power corresponding to each phase of the three-phase power grid. The system outputs the third active power and the third reactive power when the current angle is a first preset angle, a second preset angle, or a third preset angle; wherein the third active power is different from the first active power; the system obtains the fourth active power and the fourth reactive power corresponding to each phase of the three-phase incoming line; based on the second active power and the second reactive power corresponding to each phase of the incoming line, and the fourth active power and the fourth reactive power corresponding to each phase of the incoming line, the system determines the second target power corresponding to the first active power or the third active power, and records the first serial number of the current transformer corresponding to the second target power; wherein the second target power corresponds to the active power and reactive power of the incoming line.

[0012] The method further includes: the inverter obtaining the first power change gradient of the current transformer corresponding to the first-sequence current transformer and the second power change gradient of the current phase of the household line; when the first power change gradient and the second power change gradient do not match, the inverter generates a first adjustment suggestion; wherein the first adjustment suggestion is: to reverse the current transformer on the current transformer corresponding to the first-sequence current transformer and set it on the current transformer corresponding to the current transformer.

[0013] The step of the inverter outputting adjustment suggestion information for adjusting the first current transformer, the second current transformer, and the third current transformer based on the first sequence number and the second sequence number includes: when the first sequence number and the second sequence number are different, the inverter generates a second adjustment suggestion; wherein the second adjustment suggestion is: to interchange the current transformer on the phase-to-house line corresponding to the first sequence number and the current transformer on the phase-to-house line corresponding to the second sequence number.

[0014] To solve the above-mentioned technical problems, another technical solution adopted in this application is to provide an inverter, which includes a processor, a communication module and a memory. The memory is used to store a computer program, and when the computer program is executed by the processor, it is used to implement the method provided by the above-mentioned technical solution.

[0015] The power distribution system, current transformer detection method, and inverter provided in this application, for each phase of a three-phase power grid's incoming line, output a preset first target power for each phase at at least two current angles according to a current phasor rotation method; at each current angle, the power corresponding to each of the three phases' incoming lines is acquired; wherein, the power of each phase's incoming line is calculated from the current collected by its corresponding current transformer and the voltage collected by its corresponding voltage sampling unit; a second target power corresponding to each phase is determined from all the power corresponding to the three phases' incoming lines, and each phase's second target power is recorded. The second target power corresponds to the first serial number of the current transformer; wherein, the second target power is the power of a single-phase incoming line at at least two current angles, the power whose change meets the preset difference expectation; and the target voltage corresponding to the first target power of each phase is determined from the voltages collected from the three-phase incoming line, and the second serial number corresponding to the target voltage is recorded; wherein, the phase corresponding to the target voltage matches the phase corresponding to the voltage of the first target power; based on the first serial number and the second serial number, adjustment suggestion information for adjusting the first current transformer, the second current transformer, and the third current transformer is output. That is, the difference between the serial number corresponding to the current and the serial number corresponding to the voltage is used to determine whether the current transformers on the incoming line are set correctly, thereby providing correct adjustment suggestion information for the current transformers. This allows users to directly adjust the current transformers according to the adjustment suggestion information when the current transformers are set incorrectly, improving adjustment efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the power distribution system provided in this application;

[0018] Figure 2 This is a schematic diagram of the first application scenario of the power distribution system provided in this application;

[0019] Figure 3 This is a schematic diagram of the second application scenario of the power distribution system provided in this application;

[0020] Figure 4 This is a schematic diagram of the third application scenario of the power distribution system provided in this application;

[0021] Figure 5 This is a schematic diagram of the fourth application scenario of the power distribution system provided in this application;

[0022] Figure 6 This is a schematic diagram of the fifth application scenario of the power distribution system provided in this application;

[0023] Figure 7 This is a schematic diagram of the sixth application scenario of the power distribution system provided in this application;

[0024] Figure 8 This is a flowchart illustrating an embodiment of the current transformer detection method provided in this application;

[0025] Figure 9 This is a schematic diagram of an embodiment of the inverter provided in this application. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are only for explaining this application and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, not all structures. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] In existing power distribution systems, the inverter's self-testing scheme, in conjunction with the three-phase meter, can only alert the user that the three-phase meter connection is incorrect when the current transformer corresponding to the three-phase meter is connected to the wrong phase. The user does not know which phase is connected incorrectly, nor can the system provide the user with correct connection advice.

[0029] Based on this, this application proposes to use an inverter to output different first target power at at least two current angles for each phase of the incoming line, according to the current phasor rotation method; at each current angle, the power corresponding to the three-phase incoming line is obtained; wherein, the power of each phase of the incoming line is calculated from the current and corresponding voltage collected by its corresponding current transformer; a second target power corresponding to the first target power is determined from the power corresponding to the three-phase incoming line, and the first serial number of the current transformer corresponding to the second target power is recorded; wherein, the second target power is the power with the largest change among the power corresponding to the three-phase incoming line; and a target voltage corresponding to the first target power is determined from the voltage on the three-phase incoming line, and the second serial number corresponding to the target voltage is recorded; wherein, the phase corresponding to the target voltage matches the phase of the voltage corresponding to the target power; and adjustment suggestions are made for the first current transformer, the second current transformer, and the third current transformer based on the first serial number and the second serial number. That is, by using the difference between the sequence number corresponding to the current and the sequence number corresponding to the voltage, it can determine whether the current transformer on the incoming line is set correctly, and thus provide correct connection suggestions for the current transformer. This allows users to directly adjust the connection according to the suggestions when the current transformer is set incorrectly, improving adjustment efficiency. See any of the following embodiments for details.

[0030] See Figure 1 , Figure 1 This is a schematic diagram of an embodiment of the power distribution system provided in this application. The power distribution system 100 is connected to a three-phase power grid. The power distribution system 100 includes: a first current transformer CT1, a second current transformer CT2, a third current transformer CT3, a first voltage sampling unit 40, a second voltage sampling unit 50, a third voltage sampling unit 60, a three-phase meter 10, an inverter 20, and a distribution box 30.

[0031] The first current transformer CT1 is installed on the first phase of the three-phase power grid and is configured to collect the first current on the first phase of the power grid.

[0032] The second current transformer CT2 is installed on the second phase of the three-phase power grid and is configured to collect the second current on the second phase of the power grid.

[0033] The third current transformer CT3 is installed on the third phase of the three-phase power grid and is configured to collect the third current on the third phase of the power grid. That is, the first current transformer CT1, the second current transformer CT2, and the third current transformer CT3 are installed on different phases of the three-phase power grid and are configured to collect the current on the three-phase power grid.

[0034] The first voltage sampling unit 40 is installed on the first phase of the household line in the three-phase power grid and is configured to collect the first voltage on the first phase of the household line.

[0035] The second voltage sampling unit 50 is installed on the second phase of the household line in the three-phase power grid and is configured to collect the second voltage on the second phase of the household line.

[0036] The third voltage sampling unit 60 is installed on the third phase incoming line in the three-phase power grid and is configured to collect the third voltage on the third phase incoming line.

[0037] The three-phase meter 10 is communicatively connected to the first current transformer CT1, the second current transformer CT2, the third current transformer CT3, the first voltage sampling unit 40, the second voltage sampling unit 50, and the third voltage sampling unit 60, respectively. It is configured to receive a first current, a second current, and a third current, as well as to receive the first voltage on the first phase of the incoming line, the second voltage on the second phase of the incoming line, and the third voltage on the third phase of the incoming line. In some embodiments, the three-phase meter 10 is wirelessly connected to the first current transformer CT1, the second current transformer CT2, and the third current transformer CT3. In some embodiments, the three-phase meter 10 communicates with the first current transformer CT1, the second current transformer CT2, and the third current transformer CT3 via electrical connection. It is understood that the serial numbers of the first current transformer CT1, the second current transformer CT2, and the third current transformer CT3 in the three-phase meter 10 are fixed. However, when the first current transformer CT1, the second current transformer CT2, and the third current transformer CT3 are installed on the incoming power line, their positions may have been incorrectly set during installation. The first voltage sampling unit 40, the second voltage sampling unit 50, the third voltage sampling unit 60, and the three-phase meter 10 communicate via electrical connection. That is, once the first voltage sampling unit 40, the second voltage sampling unit 50, and the third voltage sampling unit 60 are set correctly, their positions are assumed to be correctly set.

[0038] Inverter 20 is installed on the first phase of the three-phase power grid's indoor line and is communicatively connected to the three-phase meter 10. This inverter 20 can be a single-phase inverter. In some embodiments, the first phase of the indoor line can correspond to the first, second, or third phase of the incoming power line. The specific configuration can be determined according to actual conditions. Since the three-phase power grid has phases A, B, and C, the first phase of the indoor line can correspond to any one of phases A, B, and C. In other embodiments, inverter 20 can be a three-phase inverter, which can be connected to phases A, B, and C of the three-phase power grid respectively.

[0039] Inverter 20 is configured as follows:

[0040] For each phase of the three-phase power grid's incoming line, following a current phasor rotation method, a preset first target power is output for each phase at at least two current angles. At each current angle, the power corresponding to each of the three phases of the incoming line is acquired. The power of each phase is calculated from the current collected by its corresponding current transformer and the voltage collected by its corresponding voltage sampling unit. A second target power is determined from all the power values ​​corresponding to each of the three phases of the incoming line, and the first serial number of the current transformer corresponding to each second target power is recorded. The second target power is the power of a phase of the incoming line at the at least two current angles whose change in power meets a preset difference expectation. A target voltage corresponding to the first target power of each phase is determined from the voltages collected on the three phases of the incoming line, and the second serial number corresponding to the target voltage is recorded. The phase of the target voltage matches the phase of the voltage corresponding to the first target power. Based on the first and second serial numbers, adjustment suggestions for adjusting the first current transformer CT1, the second current transformer CT2, and the third current transformer CT3 are output. The second target power is the power whose change in power corresponds to a preset expected difference among the power values ​​of a single-phase incoming line at at least two current angles. For example, it could be the power with the largest change in power among the power values ​​corresponding to at least two current angles. Alternatively, it could be the power whose change in power exceeds a threshold among the power values ​​corresponding to at least two current angles.

[0041] In this embodiment, the difference between the serial number corresponding to the current (current transformer) and the serial number corresponding to the voltage (voltage sampling unit) is used to determine whether the current transformer on the incoming line is set correctly. This provides correct adjustment suggestions for the current transformer, allowing users to directly adjust it according to the suggestions when the current transformer is set incorrectly, thus improving adjustment efficiency.

[0042] In one application scenario, combined Figure 2 Please provide an explanation, such as Figure 2 As shown, the first current transformer CT1 is installed on the A-phase incoming line, the second current transformer CT2 is installed on the B-phase incoming line, and the third current transformer CT3 is installed on the C-phase incoming line. The first phase of the indoor circuit corresponds to the A-phase incoming line. The first current transformer CT1 is numbered 1 in the three-phase meter 10, the second current transformer CT2 is numbered 2 in the three-phase meter 10, and the third current transformer CT3 is numbered 3 in the three-phase meter 10. The first voltage sampling unit 40 is numbered 1 in the three-phase meter 10, the second voltage sampling unit 50 is numbered 2 in the three-phase meter 10, and the third voltage sampling unit 60 is numbered 3 in the three-phase meter 10.

[0043] Based on this, at the first current angle (first preset angle), the inverter 20 outputs the target power A on the first phase indoor line, and acquires the power A1 corresponding to the A-phase indoor line at the first current angle, the power A2 corresponding to the B-phase indoor line at the first current angle, and the power A3 corresponding to the C-phase indoor line at the first current angle. Specifically, power A1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power A2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power A3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0044] Determine the power A0 corresponding to the target power A from the power values ​​A1, A2, and A3, and record the first serial number of the current transformer corresponding to power A0; where power A0 is the power with the largest change among power values ​​A1, A2, and A3. Since the first phase indoor line corresponds to the A-phase incoming line under the first current angle, this power A0 corresponds to the first current transformer CT1, and its first serial number is 1.

[0045] The target voltage V0 corresponding to the target power A is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power A. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0046] Because under the first current angle, the first phase of the indoor line corresponds to the A phase of the incoming line, the phase of the voltage V1 at this time matches the phase of the voltage corresponding to the target power A, so the voltage V1 is the target voltage V0, and the second sequence number is 1.

[0047] This indicates that the position of the first current transformer CT1 on the A-phase incoming line is correct.

[0048] At the second current angle (second preset angle), inverter 20 outputs the target power B on the first phase indoor line and acquires the power B1 corresponding to the A-phase indoor line at the second current angle, the power B2 corresponding to the B-phase indoor line at the second current angle, and the power B3 corresponding to the C-phase indoor line at the second current angle. Specifically, power B1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power B2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power B3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60. The second current angle can be obtained by adding an angle to the first current angle.

[0049] Determine the power B0 corresponding to the target power B from the power values ​​B1, B2, and B3, and record the first serial number of the current transformer corresponding to power B0; where power B0 is the power with the largest change among power values ​​B1, B2, and B3. Since the first phase indoor line corresponds to the B-phase incoming line under the second current angle, this power B0 corresponds to the second current transformer CT2, so its first serial number is 2. That is, power B2 is the power with the largest change.

[0050] The target voltage V0 corresponding to the target power B is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power B. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0051] Because under the second current angle, the first phase indoor line corresponds to the B phase incoming line, the phase of voltage V2 at this time matches the phase of voltage corresponding to the target power B, so voltage V2 is the target voltage V0, and the second sequence number is 2.

[0052] This indicates that the position of the second current transformer CT2 on the B-phase incoming line is correct.

[0053] If the positions of the current transformers on the A-phase and B-phase incoming lines are correct, then the position of the current transformer on the C-phase incoming line is also correct, and the test can be completed.

[0054] Based on this, the adjustment suggestion is: the current transformer is set correctly and no adjustment is needed.

[0055] In this application scenario, the first and second serial numbers are the same for each current angle, indicating that the current transformer on the incoming line is set correctly. Therefore, the connection suggestion for the current transformer is that no adjustment is needed, making it easy for users to know that the current transformer is set correctly.

[0056] In another application scenario, combined with Figure 3 Please provide an explanation, such as Figure 3 As shown, the first current transformer CT1 is installed on the A-phase incoming line, the second current transformer CT2 is installed on the C-phase incoming line, and the third current transformer CT3 is installed on the B-phase incoming line. The first phase of the indoor circuit corresponds to the A-phase incoming line. The first current transformer CT1 is numbered 1 in the three-phase meter 10, the second current transformer CT2 is numbered 2 in the three-phase meter 10, and the third current transformer CT3 is numbered 3 in the three-phase meter 10. The first voltage sampling unit 40 is numbered 1 in the three-phase meter 10, the second voltage sampling unit 50 is numbered 2 in the three-phase meter 10, and the third voltage sampling unit 60 is numbered 3 in the three-phase meter 10.

[0057] Based on this, under the first current angle, inverter 20 outputs the target power A on the first phase indoor line, and obtains the power A1 corresponding to the A-phase indoor line under the first current angle, the power A2 corresponding to the B-phase indoor line under the first current angle, and the power A3 corresponding to the C-phase indoor line under the first current angle. Specifically, power A1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power A2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power A3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0058] Determine the power A0 corresponding to the target power A from the power values ​​A1, A2, and A3, and record the first serial number of the current transformer corresponding to power A0; where power A0 is the power with the largest change among power values ​​A1, A2, and A3. Since the first phase indoor line corresponds to the A-phase incoming line under the first current angle, this power A0 corresponds to the first current transformer CT1, and its first serial number is 1.

[0059] The target voltage V0 corresponding to the target power A is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power A. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0060] Because under the first current angle, the first phase of the indoor line corresponds to the A phase of the incoming line, the phase of the voltage V1 at this time matches the phase of the voltage corresponding to the target power A, so the voltage V1 is the target voltage V0, and the second sequence number is 1.

[0061] This indicates that the position of the first current transformer CT1 on the A-phase incoming line is correct.

[0062] Furthermore, under the second current angle, inverter 20 outputs the target power B on the first phase indoor line and acquires the power B1 corresponding to the A-phase indoor line under the second current angle, the power B2 corresponding to the B-phase indoor line under the second current angle, and the power B3 corresponding to the C-phase indoor line under the second current angle. Specifically, power B1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power B2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power B3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0063] Determine the power B0 corresponding to the target power B from the power values ​​B1, B2, and B3, and record the first serial number of the current transformer corresponding to power B0. Power B0 is the power with the largest variation among power values ​​B1, B2, and B3. Since the first phase indoor line corresponds to the B-phase incoming line under the second current angle, this power B0 corresponds to the third current transformer CT3, so its first serial number is 3. That is, power B3 is the power with the largest variation.

[0064] The target voltage V0 corresponding to the target power B is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase of the target voltage V0 matches the phase of the voltage corresponding to the target power B.

[0065] Because under the second current angle, the first phase indoor line corresponds to the B phase incoming line, the phase of voltage V2 at this time matches the phase of voltage corresponding to the target power B, so voltage V2 is the target voltage V0, and the second sequence number is 2.

[0066] This indicates that the first and second serial numbers are different, suggesting a problem with the position of the third current transformer CT3 on the B-phase incoming line. Therefore, an adjustment suggestion is made: swap the positions of the current transformers on the incoming line corresponding to serial number 2 and serial number 3. That is, swap the positions of the third current transformer CT3 on the B-phase incoming line and the second current transformer CT2 on the C-phase incoming line.

[0067] In another application scenario, combined with Figure 4 Explanation: such as Figure 4 As shown, the second current transformer CT2 is installed on the A-phase incoming line, the first current transformer CT1 is installed on the B-phase incoming line, and the third current transformer CT3 is installed on the C-phase incoming line. The first phase of the indoor circuit corresponds to the A-phase incoming line. The first current transformer CT1 is numbered 1 in the three-phase meter 10, the second current transformer CT2 is numbered 2 in the three-phase meter 10, and the third current transformer CT3 is numbered 3 in the three-phase meter 10. The first voltage sampling unit 40 is numbered 1 in the three-phase meter 10, the second voltage sampling unit 50 is numbered 2 in the three-phase meter 10, and the third voltage sampling unit 60 is numbered 3 in the three-phase meter 10.

[0068] Based on this, under the first current angle, inverter 20 outputs the target power A on the first phase indoor line, and obtains the power A1 corresponding to the A-phase indoor line under the first current angle, the power A2 corresponding to the B-phase indoor line under the first current angle, and the power A3 corresponding to the C-phase indoor line under the first current angle. Specifically, power A1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power A2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power A3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0069] Determine the power A0 corresponding to the target power A from the power values ​​A1, A2, and A3, and record the first serial number of the current transformer corresponding to power A0; where power A0 is the power with the largest change among power values ​​A1, A2, and A3. Since the first phase indoor line corresponds to the A-phase incoming line under the first current angle, this power A0 corresponds to the second current transformer CT2, so its first serial number is 2.

[0070] The target voltage V0 corresponding to the target power A is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power A. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0071] Because under the first current angle, the first phase of the indoor line corresponds to the A phase of the incoming line, the phase of the voltage V1 at this time matches the phase of the voltage corresponding to the target power A, so the voltage V1 is the target voltage V0, and the second sequence number is 1.

[0072] The difference between the first and second serial numbers indicates a problem with the location of the current transformer on the A-phase incoming line. Therefore, an adjustment suggestion is made: swap the positions of the current transformers on the incoming line corresponding to serial number 1 and the current transformers on the incoming line corresponding to serial number 2. That is, swap the positions of the current transformers on the A-phase incoming line and the B-phase incoming line.

[0073] Furthermore, after swapping the current transformers numbered 1 and 2, the inverter 20 outputs the target power B on the first phase indoor line under the second current angle, and acquires the power B1 corresponding to the A-phase indoor line, the power B2 corresponding to the B-phase indoor line under the second current angle, and the power B3 corresponding to the C-phase indoor line under the second current angle. Specifically, power B1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power B2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power B3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0074] Determine the power B0 corresponding to the target power B from the power values ​​B1, B2, and B3, and record the first serial number of the current transformer corresponding to power B0; where power B0 is the power with the largest change among power values ​​B1, B2, and B3. Since the first phase indoor line corresponds to the B-phase incoming line under the second current angle, this power B0 corresponds to the second current transformer CT2, so its first serial number is 2. That is, power B2 is the power with the largest change.

[0075] The target voltage V0 corresponding to the target power B is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power B. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0076] Because under the second current angle, the first phase indoor line corresponds to the B phase incoming line, the phase of voltage V2 at this time matches the phase of voltage corresponding to the target power B, so voltage V2 is the target voltage V0, and the second sequence number is 2.

[0077] This indicates that the position of the second current transformer CT2 on the B-phase incoming line is correct.

[0078] Furthermore, at the third current angle (third preset angle), inverter 20 outputs the target power C on the first phase indoor line and acquires the power C1 corresponding to the A-phase incoming line, the power C2 corresponding to the B-phase incoming line, and the power C3 corresponding to the C-phase incoming line at the third current angle. Specifically, power C1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power C2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power C3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60. The third current angle is obtained by adding a preset angle to the second current angle.

[0079] Determine the power C0 corresponding to the target power C from the power values ​​C1, C2, and C3, and record the first serial number of the current transformer corresponding to power C0. Power C0 is the power with the largest variation among power values ​​C1, C2, and C3. Since the first phase indoor line corresponds to the C-phase incoming line under the third current angle, this power C0 corresponds to the third current transformer CT3, and its first serial number is 3. That is, power C3 is the power with the largest variation.

[0080] The target voltage V0 corresponding to the target power C is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power C. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0081] Because under the third current angle, the first phase indoor line corresponds to the C phase incoming line, the phase of voltage V3 at this time matches the phase of voltage corresponding to the target power C, so voltage V3 is the target voltage V0, and the second sequence number is 3.

[0082] This indicates that the position of the third current transformer CT3 on the C-phase incoming line is correct.

[0083] In another application scenario, combined with Figure 5 Explanation: such as Figure 5 As shown, the second current transformer CT2 is installed on the A-phase incoming line, the first current transformer CT1 is installed on the C-phase incoming line, and the third current transformer CT3 is installed on the B-phase incoming line. The first phase of the indoor circuit corresponds to the A-phase incoming line. The first current transformer CT1 is numbered 1 in the three-phase meter 10, the second current transformer CT2 is numbered 2 in the three-phase meter 10, and the third current transformer CT3 is numbered 3 in the three-phase meter 10. The first voltage sampling unit 40 is numbered 1 in the three-phase meter 10, the second voltage sampling unit 50 is numbered 2 in the three-phase meter 10, and the third voltage sampling unit 60 is numbered 3 in the three-phase meter 10.

[0084] Based on this, under the first current angle, inverter 20 outputs the target power A on the first phase indoor line, and obtains the power A1 corresponding to the A-phase indoor line under the first current angle, the power A2 corresponding to the B-phase indoor line under the first current angle, and the power A3 corresponding to the C-phase indoor line under the first current angle. Specifically, power A1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power A2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power A3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0085] Determine the power A0 corresponding to the target power A from the power values ​​A1, A2, and A3, and record the first serial number of the current transformer corresponding to power A0; where power A0 is the power with the largest change among power values ​​A1, A2, and A3. Since the first phase indoor line corresponds to the A-phase incoming line under the first current angle, this power A0 corresponds to the second current transformer CT2, so its first serial number is 2.

[0086] The target voltage V0 corresponding to the target power A is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power A. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0087] Because under the first current angle, the first phase of the indoor line corresponds to the A phase of the incoming line, the phase of the voltage V1 at this time matches the phase of the voltage corresponding to the target power A, so the voltage V1 is the target voltage V0, and the second sequence number is 1.

[0088] The difference between the first and second serial numbers indicates a problem with the location of the current transformer on the A-phase incoming line. Therefore, an adjustment suggestion is made: swap the positions of the current transformers on the incoming line corresponding to serial number 1 and the current transformers on the incoming line corresponding to serial number 2. That is, swap the positions of the current transformers on the A-phase incoming line and the B-phase incoming line.

[0089] Furthermore, after swapping the current transformers numbered 1 and 2, the inverter 20 outputs the target power B on the first phase indoor line under the second current angle, and acquires the power B1 corresponding to the A-phase indoor line, the power B2 corresponding to the B-phase indoor line under the second current angle, and the power B3 corresponding to the C-phase indoor line under the second current angle. Specifically, power B1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power B2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power B3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0090] Determine the power B0 corresponding to the target power B from the power values ​​B1, B2, and B3, and record the first serial number of the current transformer corresponding to power B0; where power B0 is the power with the largest change among power values ​​B1, B2, and B3. Since the first phase indoor line corresponds to the B-phase incoming line under the second current angle, this power B0 corresponds to the second current transformer CT2, so its first serial number is 2. That is, power B2 is the power with the largest change.

[0091] The target voltage V0 corresponding to the target power B is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power B. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0092] Because under the second current angle, the first phase indoor line corresponds to the B phase incoming line, the phase of voltage V2 at this time matches the phase of voltage corresponding to the target power B, so voltage V2 is the target voltage V0, and the second sequence number is 2.

[0093] This indicates that the position of the second current transformer CT2 on the B-phase incoming line is correct.

[0094] Furthermore, under the third current angle, inverter 20 outputs the target power C on the first phase indoor line and acquires the power C1 corresponding to the A-phase indoor line, the power C2 corresponding to the B-phase indoor line, and the power C3 corresponding to the C-phase indoor line under the third current angle. Specifically, power C1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power C2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power C3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0095] Determine the power C0 corresponding to the target power C from the powers C1, C2, and C3, and record the first serial number of the current transformer corresponding to power C0; where power C0 is the power with the largest change among powers C1, C2, and C3. Since the first phase indoor line corresponds to the C-phase incoming line under the third current angle, this power C0 corresponds to the first current transformer CT1, so its first serial number is 1. That is, power C1 is the power with the largest change.

[0096] The target voltage V0 corresponding to the target power C is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power C. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0097] Because under the third current angle, the first phase indoor line corresponds to the C phase incoming line, the phase of voltage V3 at this time matches the phase of voltage corresponding to the target power C, so voltage V3 is the target voltage V0, and the second sequence number is 3.

[0098] This indicates that the first and second serial numbers are different, suggesting a problem with the position of the current transformer on the C-phase incoming line. Therefore, an adjustment suggestion is made: swap the positions of the current transformers on the incoming line corresponding to serial number 1 and serial number 3. That is, swap the positions of the current transformers on the C-phase incoming line and the A-phase incoming line.

[0099] At this point, the positions of the three current transformers are correctly adjusted.

[0100] In another application scenario, combined with Figure 6 Explanation: such as Figure 6 As shown, the second current transformer CT2 is installed on the B-phase incoming line, the first current transformer CT1 is installed on the C-phase incoming line, and the third current transformer CT3 is installed on the A-phase incoming line. The first phase indoor line corresponds to the A-phase incoming line. The first current transformer CT1 is numbered 1 in the three-phase meter 10, the second current transformer CT2 is numbered 2 in the three-phase meter 10, and the third current transformer CT3 is numbered 3 in the three-phase meter 10. The first voltage sampling unit 40 is numbered 1 in the three-phase meter 10, the second voltage sampling unit 50 is numbered 2 in the three-phase meter 10, and the third voltage sampling unit 60 is numbered 3 in the three-phase meter 10.

[0101] Based on this, under the first current angle, inverter 20 outputs the target power A on the first phase indoor line, and obtains the power A1 corresponding to the A-phase indoor line under the first current angle, the power A2 corresponding to the B-phase indoor line under the first current angle, and the power A3 corresponding to the C-phase indoor line under the first current angle. Specifically, power A1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power A2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power A3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0102] Determine the power A0 corresponding to the target power A from the power values ​​A1, A2, and A3, and record the first serial number of the current transformer corresponding to power A0; where power A0 is the power with the largest change among power values ​​A1, A2, and A3. Since the first phase indoor line corresponds to the A-phase incoming line under the first current angle, this power A0 corresponds to the third current transformer CT3, so its first serial number is 3.

[0103] The target voltage V0 corresponding to the target power A is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power A. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0104] Because under the first current angle, the first phase of the indoor line corresponds to the A phase of the incoming line, the phase of the voltage V1 at this time matches the phase of the voltage corresponding to the target power A, so the voltage V1 is the target voltage V0, and the second sequence number is 1.

[0105] The difference between the first and second serial numbers indicates a problem with the location of the current transformer on the A-phase incoming line. Therefore, an adjustment suggestion is made: swap the positions of the current transformer on the incoming line corresponding to serial number 3 and the current transformer on the incoming line corresponding to serial number 1. That is, swap the positions of the current transformer on the A-phase incoming line and the current transformer on the C-phase incoming line.

[0106] Furthermore, after swapping the current transformers numbered 1 and 3, the inverter 20 outputs the target power B on the first phase indoor line under the second current angle, and acquires the power B1 corresponding to the A-phase indoor line, the power B2 corresponding to the B-phase indoor line under the second current angle, and the power B3 corresponding to the C-phase indoor line under the second current angle. Specifically, power B1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power B2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power B3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0107] Determine the power B0 corresponding to the target power B from the power values ​​B1, B2, and B3, and record the first serial number of the current transformer corresponding to power B0; where power B0 is the power with the largest change among power values ​​B1, B2, and B3. Since the first phase indoor line corresponds to the B-phase incoming line under the second current angle, this power B0 corresponds to the second current transformer CT2, so its first serial number is 2. That is, power B2 is the power with the largest change.

[0108] The target voltage V0 corresponding to the target power B is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power B. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0109] Because under the second current angle, the first phase indoor line corresponds to the B phase incoming line, the phase of voltage V2 at this time matches the phase of voltage corresponding to the target power B, so voltage V2 is the target voltage V0, and the second sequence number is 2.

[0110] This indicates that the position of the second current transformer CT2 on the B-phase incoming line is correct.

[0111] Furthermore, under the third current angle, inverter 20 outputs the target power C on the first phase indoor line and acquires the power C1 corresponding to the A-phase indoor line, the power C2 corresponding to the B-phase indoor line, and the power C3 corresponding to the C-phase indoor line under the third current angle. Specifically, power C1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power C2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power C3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0112] Determine the power C0 corresponding to the target power C from the power values ​​C1, C2, and C3, and record the first serial number of the current transformer corresponding to power C0. Power C0 is the power with the largest variation among power values ​​C1, C2, and C3. Since the first phase indoor line corresponds to the C-phase incoming line under the third current angle, this power C0 corresponds to the third current transformer CT3, and its first serial number is 3. That is, power C3 is the power with the largest variation.

[0113] The target voltage V0 corresponding to the target power C is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power C. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0114] Because under the third current angle, the first phase indoor line corresponds to the C phase incoming line, the phase of voltage V3 at this time matches the phase of voltage corresponding to the target power C, so voltage V3 is the target voltage V0, and the second sequence number is 3.

[0115] This indicates that the first and second serial numbers are the same, and the positions of the three current transformers have been adjusted correctly.

[0116] In another application scenario, combined with Figure 7 Explanation: such as Figure 7As shown, the second current transformer CT2 is installed on the C-phase incoming line, the first current transformer CT1 is installed on the B-phase incoming line, and the third current transformer CT3 is installed on the A-phase incoming line. The first phase indoor line corresponds to the A-phase incoming line. The first current transformer CT1 is numbered 1 in the three-phase meter 10, the second current transformer CT2 is numbered 2 in the three-phase meter 10, and the third current transformer CT3 is numbered 3 in the three-phase meter 10. The first voltage sampling unit 40 is numbered 1 in the three-phase meter 10, the second voltage sampling unit 50 is numbered 2 in the three-phase meter 10, and the third voltage sampling unit 60 is numbered 3 in the three-phase meter 10.

[0117] Based on this, under the first current angle, inverter 20 outputs the target power A on the first phase indoor line, and obtains the power A1 corresponding to the A-phase indoor line under the first current angle, the power A2 corresponding to the B-phase indoor line under the first current angle, and the power A3 corresponding to the C-phase indoor line under the first current angle. Specifically, power A1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power A2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power A3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0118] Determine the power A0 corresponding to the target power A from the power values ​​A1, A2, and A3, and record the first serial number of the current transformer corresponding to power A0; where power A0 is the power with the largest change among power values ​​A1, A2, and A3. Since the first phase indoor line corresponds to the A-phase incoming line under the first current angle, this power A0 corresponds to the third current transformer CT3, so its first serial number is 3.

[0119] The target voltage V0 corresponding to the target power A is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power A. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0120] Because under the first current angle, the first phase of the indoor line corresponds to the A phase of the incoming line, the phase of the voltage V1 at this time matches the phase of the voltage corresponding to the target power A, so the voltage V1 is the target voltage V0, and the second sequence number is 1.

[0121] The difference between the first and second serial numbers indicates a problem with the location of the current transformer on the A-phase incoming line. Therefore, an adjustment suggestion is made: swap the positions of the current transformer on the incoming line corresponding to serial number 3 and the current transformer on the incoming line corresponding to serial number 1. That is, swap the positions of the current transformer on the A-phase incoming line and the current transformer on the C-phase incoming line.

[0122] Furthermore, after swapping the current transformers numbered 1 and 3, the inverter 20 outputs the target power B on the first phase indoor line under the second current angle, and acquires the power B1 corresponding to the A-phase indoor line, the power B2 corresponding to the B-phase indoor line under the second current angle, and the power B3 corresponding to the C-phase indoor line under the second current angle. Specifically, power B1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power B2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power B3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0123] Determine the power B0 corresponding to the target power B from the power values ​​B1, B2, and B3, and record the first sequence number of the current transformer corresponding to power B0; where power B0 is the power with the largest change among power values ​​B1, B2, and B3. Since the first phase indoor line corresponds to the B phase incoming line under the second current angle, this power B0 corresponds to the first current transformer CT1, so its first sequence number is 1. That is, power B1 is the power with the largest change.

[0124] The target voltage V0 corresponding to the target power B is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power B. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0125] Because under the second current angle, the first phase indoor line corresponds to the B phase incoming line, the phase of voltage V2 at this time matches the phase of voltage corresponding to the target power B, so voltage V2 is the target voltage V0, and the second sequence number is 2.

[0126] This indicates that the first and second serial numbers are different, suggesting a problem with the position of the current transformer on the B-phase incoming line. Therefore, an adjustment suggestion is made: swap the positions of the current transformers on the incoming line corresponding to serial number 1 and serial number 2. That is, swap the positions of the current transformers on the A-phase and B-phase incoming lines.

[0127] Furthermore, under the third current angle, inverter 20 outputs the target power C on the first phase indoor line and acquires the power C1 corresponding to the A-phase indoor line, the power C2 corresponding to the B-phase indoor line, and the power C3 corresponding to the C-phase indoor line under the third current angle. Specifically, power C1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power C2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power C3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0128] Determine the power C0 corresponding to the target power C from the power values ​​C1, C2, and C3, and record the first serial number of the current transformer corresponding to power C0. Power C0 is the power with the largest variation among power values ​​C1, C2, and C3. Since the first phase indoor line corresponds to the C-phase incoming line under the third current angle, this power C0 corresponds to the third current transformer CT3, and its first serial number is 3. That is, power C3 is the power with the largest variation.

[0129] The target voltage V0 corresponding to the target power C is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power C. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0130] Because under the third current angle, the first phase indoor line corresponds to the C phase incoming line, the phase of voltage V3 at this time matches the phase of voltage corresponding to the target power C, so voltage V3 is the target voltage V0, and the second sequence number is 3.

[0131] This indicates that the first and second serial numbers are the same, and the positions of the three current transformers have been adjusted correctly.

[0132] In some embodiments, the first current angle (first preset angle) can be 0 degrees, the second current angle (second preset angle) can be 120 degrees, and the third current angle (third preset angle) can be 240 degrees. Since the phase difference between adjacent phases in a three-phase system is 120 degrees, when the inverter 20 rotates according to the current phasor mode, it is equivalent to switching the corresponding phase's indoor wiring to another phase's indoor wiring. For example, if the current phase's indoor wiring is phase A, then when the current angle is 120 degrees, the current phase's indoor wiring can be switched to phase B. When the current angle is 240 degrees, the current phase's indoor wiring can be switched to phase C. Of course, the first preset angle can be any angle within 360 degrees, and the second and third preset angles can be obtained by increasing the preset angle by 120 degrees. It should be noted that the first current angle of 0 degrees, the second current angle of 120 degrees, and the third current angle of 240 degrees listed in this application are only examples of the values ​​for each of the three current angles; other specific values ​​can also be selected, which are not limited here.

[0133] That is, for each phase of the incoming line, according to the current phasor rotation method, when the current angle is 0 degrees, the first active power and the first reactive power are output; the second active power and the second reactive power corresponding to each phase of the three-phase incoming line are obtained; when the current angle is 0 degrees, the third active power and the third reactive power are output; wherein, the third active power is different from the first active power; the fourth active power and the fourth reactive power corresponding to each phase of the three-phase incoming line are obtained; based on the second active power and the second reactive power corresponding to each phase of the incoming line, and the fourth active power and the fourth reactive power corresponding to each phase of the incoming line, the second target power corresponding to the first active power or the third active power is determined, and the first serial number of the current transformer corresponding to the second target power is recorded; wherein, the second target power corresponds to the active power and reactive power of the incoming line.

[0134] Furthermore, when the current angle is 120 degrees, the first active power and the first reactive power are output; the second active power and the second reactive power corresponding to each phase of the three-phase incoming line are obtained; when the current angle is 120 degrees, the third active power and the third reactive power are output; wherein, the third active power is different from the first active power, and the third reactive power is different from the first reactive power; the fourth active power and the fourth reactive power corresponding to each phase of the three-phase incoming line are obtained; based on the second active power and the second reactive power corresponding to each phase of the incoming line, and the fourth active power and the fourth reactive power corresponding to each phase of the incoming line, the second target power corresponding to the first active power or the third active power is determined, and the first serial number of the current transformer corresponding to the second target power is recorded; wherein, the second target power corresponds to the active power and reactive power of the incoming line.

[0135] Furthermore, when the current angle is 240 degrees, the first active power and the first reactive power are output; the second active power and the second reactive power corresponding to each phase of the three-phase incoming line are obtained; when the current angle is 240 degrees, the third active power and the third reactive power are output; wherein, the third active power is different from the first active power, and the third reactive power is different from the first reactive power; the fourth active power and the fourth reactive power corresponding to each phase of the three-phase incoming line are obtained; based on the second active power and the second reactive power corresponding to each phase of the incoming line, and the fourth active power and the fourth reactive power corresponding to each phase of the incoming line, the second target power corresponding to the first active power or the third active power is determined, and the first serial number of the current transformer corresponding to the second target power is recorded; wherein, the second target power corresponds to the active power and reactive power of the incoming line.

[0136] In another application scenario, combined with Figure 2 Explanation:

[0137] At a current angle of 0 degrees, inverter 20 outputs the target power A on the first phase indoor line. Inverter 20 also acquires the power A1 corresponding to the A-phase indoor line at the first current angle, the power A2 corresponding to the B-phase indoor line at the first current angle, and the power A3 corresponding to the C-phase indoor line at the first current angle. Specifically, power A1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power A2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power A3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0138] Determine the power A0 corresponding to the target power A from the power values ​​A1, A2, and A3, and record the first serial number of the current transformer corresponding to power A0; where power A0 is the power with the largest change among power values ​​A1, A2, and A3. Since the first phase indoor line corresponds to the A-phase incoming line under the first current angle, this power A0 corresponds to the first current transformer CT1, and its first serial number is 1.

[0139] The target voltage V0 corresponding to the target power A is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power A. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0140] Because under the first current angle, the first phase of the indoor line corresponds to the A phase of the incoming line, the phase of the voltage V1 at this time matches the phase of the voltage corresponding to the target power A, so the voltage V1 is the target voltage V0, and the second sequence number is 1.

[0141] This indicates that the position of the first current transformer CT1 on the A-phase incoming line is correct when the current angle is 0 degrees.

[0142] Furthermore, at a current angle of 120 degrees, inverter 20 outputs the target power B on the first phase indoor line and acquires the power B1 corresponding to the A-phase indoor line at the second current angle, the power B2 corresponding to the B-phase indoor line at the second current angle, and the power B3 corresponding to the C-phase indoor line at the second current angle. Specifically, power B1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power B2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power B3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0143] Determine the power B0 corresponding to the target power B from the power values ​​B1, B2, and B3, and record the first serial number of the current transformer corresponding to power B0; where power B0 is the power with the largest change among power values ​​B1, B2, and B3. Since the first phase indoor line corresponds to the B-phase incoming line under the second current angle, this power B0 corresponds to the second current transformer CT2, so its first serial number is 2. That is, power B2 is the power with the largest change.

[0144] The target voltage V0 corresponding to the target power B is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power B. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0145] Because under the second current angle, the first phase indoor line corresponds to the B phase incoming line, the phase of voltage V2 at this time matches the phase of voltage corresponding to the target power B, so voltage V2 is the target voltage V0, and the second sequence number is 2.

[0146] This indicates that the position of the second current transformer CT2 on the B-phase incoming line is correct at a current angle of 120 degrees.

[0147] If the first and second serial numbers are the same at a current angle of 0 degrees, and also at a current angle of 120 degrees, then it indicates that the first and second serial numbers will also be the same at a current angle of 240 degrees. Therefore, the detection can be stopped (i.e., detection should only be performed at current angles of 0 degrees and 120 degrees). Based on this, the adjustment suggestion is: the current transformer settings are correct and no adjustment is needed.

[0148] In another application scenario, combined with Figure 3 To explain, at a current angle of 0 degrees, inverter 20 outputs the target power A for the first phase indoor line and acquires the power A1 corresponding to the A-phase indoor line at the first current angle, the power A2 corresponding to the B-phase indoor line at the first current angle, and the power A3 corresponding to the C-phase indoor line at the first current angle. Specifically, power A1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power A2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power A3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0149] Determine the power A0 corresponding to the target power A from the power values ​​A1, A2, and A3, and record the first serial number of the current transformer corresponding to power A0; where power A0 is the power with the largest change among power values ​​A1, A2, and A3. Since the first phase indoor line corresponds to the A-phase incoming line under the first current angle, this power A0 corresponds to the first current transformer CT1, and its first serial number is 1.

[0150] The target voltage V0 corresponding to the target power A is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power A. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0151] Because under the first current angle, the first phase of the indoor line corresponds to the A phase of the incoming line, the phase of the voltage V1 at this time matches the phase of the voltage corresponding to the target power A, so the voltage V1 is the target voltage V0, and the second sequence number is 1.

[0152] This indicates that the position of the first current transformer CT1 on the A-phase incoming line is correct when the current angle is 0 degrees.

[0153] Furthermore, at a current angle of 120 degrees, inverter 20 outputs the target power B on the first phase indoor line and acquires the power B1 corresponding to the A-phase indoor line at the second current angle, the power B2 corresponding to the B-phase indoor line at the second current angle, and the power B3 corresponding to the C-phase indoor line at the second current angle. Specifically, power B1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power B2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power B3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0154] Determine the power B0 corresponding to the target power B from the power values ​​B1, B2, and B3, and record the first serial number of the current transformer corresponding to power B0. Power B0 is the power with the largest variation among power values ​​B1, B2, and B3. Since the first phase indoor line corresponds to the B-phase incoming line under the second current angle, this power B0 corresponds to the third current transformer CT3, so its first serial number is 3. That is, power B3 is the power with the largest variation.

[0155] The target voltage V0 corresponding to the target power B is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase of the target voltage V0 matches the phase of the voltage corresponding to the target power B.

[0156] Because under the second current angle, the first phase indoor line corresponds to the B phase incoming line, the phase of voltage V2 at this time matches the phase of voltage corresponding to the target power B, so voltage V2 is the target voltage V0, and the second sequence number is 2.

[0157] This indicates that, at a current angle of 120 degrees, the first serial number is 3 and the second serial number is 2.

[0158] If the first and second serial numbers are the same at a current angle of 0 degrees, and the first serial number is 3 and the second serial number is 2 at a current angle of 120 degrees, indicating that the first and second serial numbers will also be different at a current angle of 240 degrees, then the testing can be stopped (i.e., testing should only be performed at current angles of 0 degrees and 120 degrees). Based on this, the adjustment suggestion is to swap the positions of the current transformers on the phase-in service line corresponding to serial number 2 and the phase-in service line corresponding to serial number 3. That is, swap the positions of the third current transformer CT3 on the phase-in service line B and the second current transformer CT2 on the phase-in service line C.

[0159] In another application scenario, combined with Figure 4 Explanation: At a current angle of 0 degrees, inverter 20 outputs the target power A on the first phase indoor line and acquires the power A1 corresponding to the A-phase indoor line at the first current angle, the power A2 corresponding to the B-phase indoor line at the first current angle, and the power A3 corresponding to the C-phase indoor line at the first current angle. Specifically, power A1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power A2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power A3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0160] Determine the power A0 corresponding to the target power A from the power values ​​A1, A2, and A3, and record the first serial number of the current transformer corresponding to power A0; where power A0 is the power with the largest change among power values ​​A1, A2, and A3. Since the first phase indoor line corresponds to the A-phase incoming line under the first current angle, this power A0 corresponds to the second current transformer CT2, so its first serial number is 2.

[0161] The target voltage V0 corresponding to the target power A is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power A. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0162] Because under the first current angle, the first phase of the indoor line corresponds to the A phase of the incoming line, the phase of the voltage V1 at this time matches the phase of the voltage corresponding to the target power A, so the voltage V1 is the target voltage V0, and the second sequence number is 1.

[0163] This indicates that, at a current angle of 0 degrees, the first sequence number is 2 and the second sequence number is 1.

[0164] Furthermore, at a current angle of 120 degrees, inverter 20 outputs the target power B on the first phase indoor line and acquires the power B1 corresponding to the A-phase indoor line at the second current angle, the power B2 corresponding to the B-phase indoor line at the second current angle, and the power B3 corresponding to the C-phase indoor line at the second current angle. Specifically, power B1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power B2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power B3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0165] Determine the power B0 corresponding to the target power B from the power values ​​B1, B2, and B3, and record the first sequence number of the current transformer corresponding to power B0; where power B0 is the power with the largest change among power values ​​B1, B2, and B3. Since the first phase indoor line corresponds to the B phase incoming line under the second current angle, this power B0 corresponds to the first current transformer CT1, so its first sequence number is 1. That is, power B1 is the power with the largest change.

[0166] The target voltage V0 corresponding to the target power B is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power B. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0167] Because under the second current angle, the first phase indoor line corresponds to the B phase incoming line, the phase of voltage V2 at this time matches the phase of voltage corresponding to the target power B, so voltage V2 is the target voltage V0, and the second sequence number is 2.

[0168] This indicates that, at a current angle of 120 degrees, the first serial number is 1 and the second serial number is 2.

[0169] If the first serial number is 2 and the second serial number is 1 at a current angle of 0 degrees, and the first serial number is 1 and the second serial number is 2 at a current angle of 120 degrees, then the first serial number and the second serial number will be the same at a current angle of 240 degrees, both being 3. Based on this, the adjustment suggestion is: it is recommended to interchange the positions of the current transformers on the phase-to-house line corresponding to serial number 1 and the phase-to-house line corresponding to serial number 2. That is, interchange the positions of the current transformers on the A-phase and B-phase incoming lines.

[0170] In another application scenario, combined with Figure 5 Explanation: At a current angle of 0 degrees,

[0171] Inverter 20 outputs the target power A on the first phase indoor line and acquires the power A1 corresponding to the A-phase indoor line at the first current angle, the power A2 corresponding to the B-phase indoor line at the first current angle, and the power A3 corresponding to the C-phase indoor line at the first current angle. Specifically, power A1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power A2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power A3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0172] Determine the power A0 corresponding to the target power A from the power values ​​A1, A2, and A3, and record the first serial number of the current transformer corresponding to power A0; where power A0 is the power with the largest change among power values ​​A1, A2, and A3. Since the first phase indoor line corresponds to the A-phase incoming line under the first current angle, this power A0 corresponds to the second current transformer CT2, so its first serial number is 2.

[0173] The target voltage V0 corresponding to the target power A is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power A. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0174] Because under the first current angle, the first phase of the indoor line corresponds to the A phase of the incoming line, the phase of the voltage V1 at this time matches the phase of the voltage corresponding to the target power A, so the voltage V1 is the target voltage V0, and the second sequence number is 1.

[0175] This indicates that, at a current angle of 0 degrees, the first sequence number is 2 and the second sequence number is 1.

[0176] Furthermore, at a current angle of 120 degrees, inverter 20 outputs the target power B on the first phase indoor line and acquires the power B1 corresponding to the A-phase indoor line at the second current angle, the power B2 corresponding to the B-phase indoor line at the second current angle, and the power B3 corresponding to the C-phase indoor line at the second current angle. Specifically, power B1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power B2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power B3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0177] Determine the power B0 corresponding to the target power B from the power values ​​B1, B2, and B3, and record the first serial number of the current transformer corresponding to power B0; where power B0 is the power with the largest change among power values ​​B1, B2, and B3. Since the first phase indoor line corresponds to the B-phase incoming line under the second current angle, this power B0 corresponds to the third current transformer CT3, so its first serial number is 3. That is, power B3 is the power with the largest change.

[0178] The target voltage V0 corresponding to the target power B is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power B. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0179] Because under the second current angle, the first phase indoor line corresponds to the B phase incoming line, the phase of voltage V2 at this time matches the phase of voltage corresponding to the target power B, so voltage V2 is the target voltage V0, and the second sequence number is 2.

[0180] This indicates that, at a current angle of 120 degrees, the first serial number is 3 and the second serial number is 2.

[0181] Furthermore, at a current angle of 240 degrees, inverter 20 acquires the power C1 corresponding to the A-phase incoming line at the third current angle, the power C2 corresponding to the B-phase incoming line at the third current angle, and the power C3 corresponding to the C-phase incoming line at the third current angle. Specifically, power C1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power C2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power C3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0182] Determine the power C0 corresponding to the target power C from the powers C1, C2, and C3, and record the first serial number of the current transformer corresponding to power C0; where power C0 is the power with the largest change among powers C1, C2, and C3. Since the first phase indoor line corresponds to the C-phase incoming line under the third current angle, this power C0 corresponds to the first current transformer CT1, so its first serial number is 1. That is, power C1 is the power with the largest change.

[0183] The target voltage V0 corresponding to the target power C is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power C. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0184] Because under the third current angle, the first phase indoor line corresponds to the C phase incoming line, the phase of voltage V3 at this time matches the phase of voltage corresponding to the target power C, so voltage V3 is the target voltage V0, and the second sequence number is 3.

[0185] This indicates that, at a current angle of 240 degrees, the first serial number is 1 and the second serial number is 3.

[0186] If, at a current angle of 0 degrees, the first serial number is 2 and the second serial number is 1, and at a current angle of 120 degrees, the first serial number is 3 and the second serial number is 2, then at a current angle of 240 degrees, the first serial number is 1 and the second serial number is 3, indicating that all three current transformers are not in the correct positions. Based on this, the adjustment suggestion is as follows: First, swap the positions of the current transformers on the phase B and phase A of the incoming line, and then swap the positions of the current transformers on the phase A and phase C of the incoming line.

[0187] At this point, the positions of the three current transformers are correctly adjusted.

[0188] In another application scenario, combined with Figure 6 Explanation: At a current angle of 0 degrees, inverter 20 outputs the target power A on the first phase indoor line and acquires the power A1 corresponding to the A-phase indoor line at the first current angle, the power A2 corresponding to the B-phase indoor line at the first current angle, and the power A3 corresponding to the C-phase indoor line at the first current angle. Specifically, power A1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power A2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power A3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0189] Determine the power A0 corresponding to the target power A from the power values ​​A1, A2, and A3, and record the first serial number of the current transformer corresponding to power A0; where power A0 is the power with the largest change among power values ​​A1, A2, and A3. Since the first phase indoor line corresponds to the A-phase incoming line under the first current angle, this power A0 corresponds to the third current transformer CT3, so its first serial number is 3.

[0190] The target voltage V0 corresponding to the target power A is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power A. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0191] Because under the first current angle, the first phase of the indoor line corresponds to the A phase of the incoming line, the phase of the voltage V1 at this time matches the phase of the voltage corresponding to the target power A, so the voltage V1 is the target voltage V0, and the second sequence number is 1.

[0192] This indicates that, at a current angle of 0 degrees, the first serial number is 3 and the second serial number is 1.

[0193] Furthermore, at a current angle of 120 degrees, and at a second current angle, inverter 20 outputs the target power B on the first phase indoor line, and acquires the power B1 corresponding to the A-phase indoor line at the second current angle, the power B2 corresponding to the B-phase indoor line at the second current angle, and the power B3 corresponding to the C-phase indoor line at the second current angle. Specifically, power B1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power B2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power B3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0194] Determine the power B0 corresponding to the target power B from the power values ​​B1, B2, and B3, and record the first serial number of the current transformer corresponding to power B0; where power B0 is the power with the largest change among power values ​​B1, B2, and B3. Since the first phase indoor line corresponds to the B-phase incoming line under the second current angle, this power B0 corresponds to the second current transformer CT2, so its first serial number is 2. That is, power B2 is the power with the largest change.

[0195] The target voltage V0 corresponding to the target power B is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power B. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0196] Because under the second current angle, the first phase indoor line corresponds to the B phase incoming line, the phase of voltage V2 at this time matches the phase of voltage corresponding to the target power B, so voltage V2 is the target voltage V0, and the second sequence number is 2.

[0197] This indicates that, at a current angle of 120 degrees, the first sequence number is 2 and the second sequence number is 2.

[0198] Furthermore, at a current angle of 240 degrees, inverter 20 acquires the power C1 corresponding to the A-phase incoming line at the third current angle, the power C2 corresponding to the B-phase incoming line at the third current angle, and the power C3 corresponding to the C-phase incoming line at the third current angle. Specifically, power C1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power C2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power C3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0199] Determine the power C0 corresponding to the target power C from the powers C1, C2, and C3, and record the first serial number of the current transformer corresponding to power C0; where power C0 is the power with the largest change among powers C1, C2, and C3. Since the first phase indoor line corresponds to the C-phase incoming line under the third current angle, this power C0 corresponds to the first current transformer CT1, so its first serial number is 1. That is, power C1 is the power with the largest change.

[0200] The target voltage V0 corresponding to the target power C is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power C. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0201] Because under the third current angle, the first phase indoor line corresponds to the C phase incoming line, the phase of voltage V3 at this time matches the phase of voltage corresponding to the target power C, so voltage V3 is the target voltage V0, and the second sequence number is 3.

[0202] This indicates that, at a current angle of 240 degrees, the first serial number is 1 and the second serial number is 3.

[0203] In summary, at a current angle of 0 degrees, the first serial number is 3 and the second serial number is 1. At a current angle of 120 degrees, the first serial number is 2 and the second serial number is 2. At a current angle of 240 degrees, the first serial number is 1 and the second serial number is 3. Based on this, the proposed adjustment is: It is recommended to interchange the positions of the current transformers on the phase-to-house line corresponding to serial number 1 and the phase-to-house line corresponding to serial number 3. That is, interchange the positions of the current transformers on the A-phase and C-phase incoming lines.

[0204] At this point, the positions of the three current transformers are correctly adjusted.

[0205] In another application scenario, combined with Figure 7 Explanation:

[0206] At a current angle of 0 degrees, inverter 20 outputs the target power A for the first phase indoor line and acquires the power A1 corresponding to the A-phase indoor line at the first current angle, the power A2 corresponding to the B-phase indoor line at the first current angle, and the power A3 corresponding to the C-phase indoor line at the first current angle. Specifically, power A1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power A2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power A3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0207] Determine the power A0 corresponding to the target power A from the power values ​​A1, A2, and A3, and record the first serial number of the current transformer corresponding to power A0; where power A0 is the power with the largest change among power values ​​A1, A2, and A3. Since the first phase indoor line corresponds to the A-phase incoming line under the first current angle, this power A0 corresponds to the third current transformer CT3, so its first serial number is 3.

[0208] The target voltage V0 corresponding to the target power A is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power A. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0209] Because under the first current angle, the first phase of the indoor line corresponds to the A phase of the incoming line, the phase of the voltage V1 at this time matches the phase of the voltage corresponding to the target power A, so the voltage V1 is the target voltage V0, and the second sequence number is 1.

[0210] This indicates that, at a current angle of 0 degrees, the first serial number is 3 and the second serial number is 1.

[0211] Furthermore, at a current angle of 120 degrees, inverter 20 outputs the target power B on the first phase indoor line and acquires the power B1 corresponding to the A-phase indoor line at the second current angle, the power B2 corresponding to the B-phase indoor line at the second current angle, and the power B3 corresponding to the C-phase indoor line at the second current angle. Specifically, power B1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power B2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power B3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0212] Determine the power B0 corresponding to the target power B from the power values ​​B1, B2, and B3, and record the first sequence number of the current transformer corresponding to power B0; where power B0 is the power with the largest change among power values ​​B1, B2, and B3. Since the first phase indoor line corresponds to the B phase incoming line under the second current angle, this power B0 corresponds to the first current transformer CT1, so its first sequence number is 1. That is, power B1 is the power with the largest change.

[0213] The target voltage V0 corresponding to the target power B is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power B. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0214] Because under the second current angle, the first phase indoor line corresponds to the B phase incoming line, the phase of voltage V2 at this time matches the phase of voltage corresponding to the target power B, so voltage V2 is the target voltage V0, and the second sequence number is 2.

[0215] This indicates that, at a current angle of 120 degrees, the first serial number is 1 and the second serial number is 2.

[0216] Furthermore, at a current angle of 240 degrees, inverter 20 outputs the target power C on the first phase indoor line and acquires the power C1 corresponding to the A-phase indoor line at the third current angle, the power C2 corresponding to the B-phase indoor line at the third current angle, and the power C3 corresponding to the C-phase indoor line at the third current angle. Specifically, power C1 is calculated from the current collected by the first current transformer CT1 and the voltage collected by the first voltage sampling unit 40; power C2 is calculated from the current collected by the second current transformer CT2 and the voltage collected by the second voltage sampling unit 50; and power C3 is calculated from the current collected by the third current transformer CT3 and the voltage collected by the third voltage sampling unit 60.

[0217] Determine the power C0 corresponding to the target power C from the power values ​​C1, C2, and C3, and record the first serial number of the current transformer corresponding to power C0. Power C0 is the power with the largest change among power values ​​C1, C2, and C3. Since the first phase indoor line corresponds to the C-phase incoming line under the third current angle, this power C0 corresponds to the second current transformer CT2, so its first serial number is 2. That is, power C2 is the power with the largest change.

[0218] The target voltage V0 corresponding to the target power C is determined from the voltages V1, V2, and V3 collected by the first voltage sampling unit 40, the second voltage sampling unit 50, and the second sequence number of the voltage sampling unit corresponding to the target voltage V0 is recorded. The phase corresponding to the target voltage V0 matches the phase corresponding to the voltage of the target power C. If the current transformer is set correctly, the sequence numbers of the current transformer and voltage sampling unit corresponding to each phase of the incoming line should be the same.

[0219] Because under the third current angle, the first phase indoor line corresponds to the C phase incoming line, the phase of voltage V3 at this time matches the phase of voltage corresponding to the target power C, so voltage V3 is the target voltage V0, and the second sequence number is 3.

[0220] This indicates that, at a current angle of 240 degrees, the first serial number is 2 and the second serial number is 3.

[0221] In summary, at a current angle of 0 degrees, the first serial number is 3 and the second serial number is 1. At a current angle of 120 degrees, the first serial number is 1 and the second serial number is 2. At a current angle of 240 degrees, the first serial number is 2 and the second serial number is 3. Based on this, the adjustment suggestion is as follows: First, swap the positions of the current transformers on the phase-entry lines corresponding to serial number 1 and 3. Then, swap the positions of the current transformers on the phase-entry lines corresponding to serial number 1 and 2. That is, first swap the positions of the current transformers on the A-phase and C-phase entry lines, and then swap the positions of the current transformers on the A-phase and B-phase entry lines.

[0222] At this point, the positions of the three current transformers are correctly adjusted.

[0223] In some embodiments, the inverter 20 of this application may be a single-phase inverter 20 or a three-phase inverter 20.

[0224] When inverter 20 is a single-phase inverter 20, it can output different first target power sequentially at at least two current angles according to the current phasor rotation method. For specific methods, please refer to the embodiments of this application, which will not be repeated here.

[0225] When inverter 20 is a three-phase inverter 20, one phase can be selected from inverter 20, and different first target power can be output sequentially at at least two current angles according to the current phasor rotation method. For specific methods, please refer to the embodiments of this application, which will not be repeated here.

[0226] When inverter 20 is a three-phase inverter 20, each phase of inverter 20 can be used. That is, different target power can be output on each phase of the indoor line in sequence. For details on the subsequent methods, please refer to the embodiments of this application, which will not be elaborated here.

[0227] In some embodiments, besides being misplaced, current transformers may also be reversed in orientation. Therefore, to resolve this issue, the direction of the current in the transformer can be used to determine the problem. If the current direction is determined to be reversed, it is recommended to reverse the orientation of the current transformer and place it on the corresponding incoming line.

[0228] In other embodiments, the inverter 20 can output two different target powers on its corresponding phase's indoor line at the same current angle. At this current angle, after the inverter 20 outputs the first target power, the power corresponding to each phase's indoor line can be collected. At the same current angle, after the inverter 20 outputs another target power for the second time, the power corresponding to each phase's indoor line can also be determined. Through the two power changes, the sequence number of the current transformer corresponding to the power with the largest power change is taken as the first sequence number. That is, at this current angle, by outputting two different target powers on its corresponding phase's indoor line, the inverter 20 can know the first power change gradient (the change between the two power changes) of the indoor line corresponding to the first sequence number's current transformer, and the second power change gradient (the change between the two power changes) of the current phase's indoor line corresponding to the inverter 20. Since the power is calculated from the current, if the direction of the first sequence number's current transformer is reversed, the sign of its power will also be reversed. If the sign of the second power change gradient corresponding to the current phase indoor line of inverter 20 is positive, then the first power change gradient is negative. At this time, the first power change gradient and the second power change gradient do not match, so a first adjustment suggestion can be generated to reverse the current transformer on the first phase indoor line to the corresponding indoor line.

[0229] If the direction of the first-sequence current transformer is not reversed, its power sign is normal. Therefore, if the sign of the second power change gradient corresponding to the current phase indoor line of inverter 20 is positive, the first power change gradient is also positive. At this time, the first power change gradient and the second power change gradient match, and a first adjustment suggestion can be generated to set the current transformer on the first-sequence indoor line according to its original direction on the corresponding indoor line.

[0230] In this way, the inverter 20 can output two different target powers on its corresponding indoor line at the same current angle, and then find the current transformer corresponding to the maximum power change at the same current angle, using the serial number of that current transformer as the first serial number. This can offset the erroneous judgment caused by the load on the indoor line affecting the power change.

[0231] In some embodiments, the inverter 20 is further configured to: for each phase of the incoming line, according to the current phasor rotation method, output a first active power and a first reactive power when the current angle is 0 degrees; acquire a second active power and a second reactive power corresponding to each phase of the three-phase incoming line; output a third active power and a third reactive power when the current angle is 0 degrees; wherein the third active power is different from the first active power; acquire a fourth active power and a fourth reactive power corresponding to each phase of the three-phase incoming line; determine a second target power corresponding to the first active power or the third active power based on the second active power and the second reactive power, and the fourth active power and the fourth reactive power corresponding to each phase of the incoming line, and record the first serial number of the current transformer corresponding to the second target power; wherein the second target power corresponds to the active power and reactive power of the incoming line.

[0232] Because the third active power output of inverter 20 differs from the first active power when the current angle is 0 degrees, the corresponding active and reactive power on the incoming lines of that phase will also change. Based on this, the second power change gradient on that phase's indoor line and the first power change gradient of each phase's incoming line can be calculated. For example, the second power change gradient on that phase's indoor line can be calculated using the first active power, first reactive power, third active power, and third reactive power. The first power change gradient of the first phase's incoming line can be calculated using the second active power, second reactive power, fourth active power, and fourth reactive power corresponding to the first phase's incoming line. The first power change gradient of the second phase's incoming line can be calculated using the second active power, second reactive power, fourth active power, and fourth reactive power corresponding to the second phase's incoming line. The first power change gradient of the third phase's incoming line can be calculated using the second active power, second reactive power, fourth active power, and fourth reactive power corresponding to the third phase's incoming line.

[0233] It is understandable that the power of the first phase, second phase, and third phase incoming lines are only calculated values ​​and are directly related to the current transformers installed on them. If the current transformers are set correctly, there is no problem; if the current transformers are set incorrectly, there is a problem.

[0234] Therefore, the target first power change gradient corresponding to the second power change gradient can be determined from the three first power change gradients, and the serial number of the current transformer corresponding to the target first power change gradient can be recorded as the first serial number.

[0235] Furthermore, the inverter 20 is also configured to: for each phase of the incoming line, according to the current phasor rotation method, output a first active power and a first reactive power when the current angle is 120 degrees; acquire the second active power and the second reactive power corresponding to each phase of the three-phase incoming line; output a third active power and a third reactive power when the current angle is 120 degrees; wherein the third active power is different from the first active power, and the third reactive power is different from the first reactive power; acquire the fourth active power and the fourth reactive power corresponding to each phase of the three-phase incoming line; determine the second target power corresponding to the first active power or the third active power based on the second active power and the second reactive power, and the fourth active power and the fourth reactive power corresponding to each phase of the incoming line, and record the first serial number of the current transformer corresponding to the second target power; wherein the second target power corresponds to the active power and reactive power of the incoming line.

[0236] When the current angle is 120 degrees, inverter 20 can refer to the technical solution when the current angle is 0 degrees to find the first serial number of the current transformer corresponding to the second target power. It can be understood that the first active power, first reactive power, second active power, second reactive power, third active power, third reactive power, fourth active power, and fourth reactive power involved when the current angle is 120 degrees differ from those involved when the current angle is 0 degrees.

[0237] Furthermore, the inverter 20 is also configured to: for each phase of the incoming line, according to the current phasor rotation method, output a first active power and a first reactive power when the current angle is 240 degrees; acquire the second active power and the second reactive power corresponding to each phase of the three-phase incoming line; output a third active power and a third reactive power when the current angle is 240 degrees; wherein the third active power is different from the first active power, and the third reactive power is different from the first reactive power; acquire the fourth active power and the fourth reactive power corresponding to each phase of the three-phase incoming line; determine the second target power corresponding to the first active power or the third active power based on the second active power and the second reactive power, and the fourth active power and the fourth reactive power corresponding to each phase of the incoming line, and record the first serial number of the current transformer corresponding to the second target power; wherein the second target power corresponds to the active power and reactive power of the incoming line.

[0238] When the current angle is 240 degrees, inverter 20 can refer to the technical solution when the current angle is 0 degrees to find the first serial number of the current transformer corresponding to the second target power. It can be understood that the first active power, first reactive power, second active power, second reactive power, third active power, third reactive power, fourth active power, and fourth reactive power involved when the current angle is 240 degrees differ from those involved when the current angle is 0 degrees. Furthermore, the first active power, first reactive power, second active power, second reactive power, third active power, third reactive power, fourth active power, and fourth reactive power involved when the current angle is 240 degrees are different from those involved when the current angle is 120 degrees.

[0239] For example, when the current angle is 0 degrees, the first active power is 250W, the first reactive power is 0var, the third active power is 500W, and the third reactive power is 0var. When the current angle is 120 degrees, the first active power is -125W, the first reactive power is 216var, the third active power is -250W, and the third reactive power is 433var. When the current angle is 240 degrees, the first active power is -125W, the first reactive power is -216var, the third active power is -250W, and the third reactive power is -433var.

[0240] Furthermore, the inverter 20 is also configured to: acquire the first power change gradient of the incoming line corresponding to the first sequence current transformer, and the second power change gradient corresponding to the current phase of the household line; when the first power change gradient and the second power change gradient do not match, generate a first adjustment suggestion; wherein, the first adjustment suggestion is: to reverse the current transformer on the incoming line of the phase corresponding to the first sequence current transformer and set it on the corresponding incoming line.

[0241] Furthermore, the inverter 20 is also configured to generate a second adjustment suggestion when the first sequence number and the second sequence number are different; wherein the second adjustment suggestion is to swap the current transformer on the incoming line of the phase corresponding to the first sequence number and the current transformer on the incoming line of the phase corresponding to the second sequence number.

[0242] In some embodiments, after the inverter 20 completes a cycle of 0 degrees, 120 degrees, and 240 degrees, it can determine whether the current transformers on the first, second, and third phase incoming lines are incorrectly configured and whether their directions are reversed. Corresponding adjustment suggestions can then be provided, such as reversing the current transformer settings on the corresponding phase incoming lines or swapping the positions of the current transformers on different phase incoming lines. The inverter 20 can output these adjustment suggestions via voice. In some embodiments, the inverter 20 can communicate with a terminal device, sending adjustment suggestions to the terminal device for the user to view and adjust as needed. The terminal device can be a mobile terminal, computer, server, or similar device.

[0243] See Figure 8 , Figure 8 This is a flowchart illustrating an embodiment of the current transformer detection method provided in this application. It is applied to the aforementioned inverter 20, which is installed in the power distribution system 100 mentioned in this application. The detection method includes:

[0244] Step 81: For each phase of the three-phase grid's incoming line, the inverter outputs the corresponding preset first target power at at least two current angles according to the current phasor rotation method.

[0245] Step 82: The inverter acquires the power corresponding to each of the three-phase incoming lines at each current angle; wherein, the power of each phase incoming line is calculated from the current collected by its corresponding current transformer and the voltage collected by its corresponding voltage sampling unit.

[0246] Step 83: The inverter determines the second target power corresponding to each of the three-phase incoming lines from all the power corresponding to each, and records the first serial number of the current transformer corresponding to each second target power; wherein, the second target power is the power of a single-phase incoming line at at least two current angles whose change meets the preset difference expectation.

[0247] Step 84: The inverter determines the target voltage corresponding to the first target power of each phase from the voltage collected from the three-phase incoming line, and records the second sequence number corresponding to the target voltage; wherein, the phase corresponding to the target voltage matches the voltage phase corresponding to the first target power.

[0248] Step 85: The inverter outputs adjustment suggestion information for adjusting the first current transformer, the second current transformer, and the third current transformer based on the first sequence number and the second sequence number.

[0249] Steps 81 to 85 can be found in the specific process described in the above embodiments, and will not be repeated here.

[0250] In some embodiments, the first target power includes active power and reactive power. The step of the inverter outputting the corresponding preset first target power for each phase of the three-phase grid's incoming line at at least two current angles, according to a current phasor rotation method, includes: for each phase of the incoming line, according to a current phasor rotation method, outputting the corresponding first active power and first reactive power at a current angle of a first preset angle, a second preset angle, or a third preset angle; wherein the second preset angle is the first preset angle plus a preset angle; the third preset angle is the second preset angle plus a preset angle; and obtaining the first target power corresponding to each phase of the three-phase incoming line. Two active power and two reactive power; when the current angle is a first preset angle, a second preset angle, or a third preset angle, output a third active power and a third reactive power; wherein the third active power is different from the first active power; obtain the fourth active power and the fourth reactive power corresponding to each phase of the three-phase incoming line; based on the second active power and the second reactive power corresponding to each phase of the incoming line, and the fourth active power and the fourth reactive power corresponding to each phase of the incoming line, determine the second target power corresponding to the first active power or the third active power, and record the first serial number of the current transformer corresponding to the second target power; wherein the second target power corresponds to the active power and reactive power of the incoming line.

[0251] In some embodiments, the inverter obtains the first power change gradient of the current transformer corresponding to the phase of the household line with the first sequence number, and the second power change gradient of the current phase of the household line; when the first power change gradient and the second power change gradient do not match, the inverter generates a first adjustment suggestion; wherein, the first adjustment suggestion is: to reverse the current transformer on the phase of the household line corresponding to the first sequence number and set it on the corresponding phase of the household line.

[0252] In some embodiments, the step of the inverter outputting adjustment suggestion information for adjusting the first current transformer, the second current transformer, and the third current transformer according to the first sequence number and the second sequence number includes: when the first sequence number and the second sequence number are different, the inverter generates a second adjustment suggestion; wherein the second adjustment suggestion is: to interchange the current transformer on the phase-to-house line corresponding to the first sequence number and the current transformer on the phase-to-house line corresponding to the second sequence number.

[0253] In one application scenario, when the three-phase meter 10 is connected and the circuit is closed, the inverter 20 cycles through the following six states:

[0254] State 1: Inverter 20 is based on the current phase-locked voltage, denoted as the phasor angle in the three-phase phasor coordinate system, and is written as U. INV ∠0°, and the given current phasor of inverter 20 is denoted as

[0255] In some embodiments, during State 1, inverter 20 outputs 250W of active power and 0var of reactive power. That is, the current rotation is 0 degrees. In this case, the power corresponding to the three-phase incoming lines is recorded.

[0256] State 2: Inverter 20 is based on the current phase-locked voltage, denoted as the phasor angle in the three-phase phasor coordinate system, and is written as U. INV ∠0°, and the given current phasor of inverter 20 is denoted as

[0257] In some embodiments, during State 2, inverter 20 outputs 500W of active power and 0var of reactive power. That is, the current rotation is 0 degrees. In this case, the power corresponding to the three-phase incoming lines is recorded.

[0258] State 3: Inverter 20 is based on the current phase-locked voltage, denoted as the phasor angle in the three-phase phasor coordinate system, and is written as U. INV ∠0°, and the given current phasor of inverter 20 is denoted as

[0259] In some embodiments, during State 3, inverter 20 outputs an active power of -125W and a reactive power of 216var. This means the current rotates 120 degrees. In this case, the power corresponding to the three-phase incoming lines is recorded.

[0260] State 4: Inverter 20 is based on the current phase-locked voltage, denoted as the phasor angle in the three-phase phasor coordinate system, and is written as U. INV ∠0°, and the given current phasor of inverter 20 is denoted as

[0261] In some embodiments, during State 4, inverter 20 outputs an active power of -250W and a reactive power of 433var. This means the current rotates 120 degrees. In this case, the power corresponding to the three-phase incoming lines is recorded.

[0262] State 5: Inverter 20 is based on the current phase-locked voltage, denoted as the phasor angle in the three-phase phasor coordinate system, and is written as U. INV ∠0°, and the given current phasor of inverter 20 is denoted as

[0263] In some embodiments, under State 5, inverter 20 outputs an active power of -125W and a reactive power of -216var. This means the current rotates 240 degrees. In this case, the power corresponding to the three-phase incoming lines is recorded.

[0264] State 6: Inverter 20 is based on the current phase-locked voltage, denoted as the phasor angle in the three-phase phasor coordinate system, and is written as U.INV ∠0°, and the given current phasor of inverter 20 is denoted as

[0265] In some embodiments, during State 6, inverter 20 outputs an active power of -250W and a reactive power of -433var. This means the current rotates 240 degrees. In this case, the power corresponding to the three-phase incoming lines is recorded.

[0266] The decision logic is as follows:

[0267] First: Determine the serial number of the current transformer corresponding to the three-phase meter connected to inverter 20.

[0268] Decision method: During the state transition from State1 to State2:

[0269] Changes in the output power of inverter 20 will cause significant changes in the current of the connected phase, thus causing significant changes in the power of that phase. By comparing the changes in the three-phase power, the current transformer corresponding to the phase with the largest power change is the current transformer connected to inverter 20, denoted as CTk.

[0270] Next, determine the phase of the phase voltage connected to inverter 20.

[0271] Determination method: In the above cycle of State 1 to State 6:

[0272] Defined as the power change gradient of phase Lk of three-phase meter 10 in the nth state.

[0273] U Lock∠PhaseLock : Defined as the amplitude and phase of the voltage phasor on phase k of the three-phase meter 10.

[0274] If, in a certain state k, the absolute value of the power change gradient is consistent with the absolute value of the power change gradient of inverter 20, it means that the current phase of inverter 20 is consistent with the voltage phase on phase k of three-phase meter 10. The voltage phase at which inverter 20 is connected to the grid can then be obtained, denoted as: U. InvGrid∠PhaseInvGrid =U Lock∠(PhaseLock-Statek / 2*120°) The serial number x of the actual connected voltage sampling unit of inverter 20 can be obtained by comparing it with the three-phase voltage angle value returned by the meter.

[0275] Next, determine whether the current transformer is reverse-connected.

[0276] Decision method: During the state transition from State1 to State2:

[0277] In State k, if the sign of the power change gradient of the meter matches the sign of the power change gradient commanded by inverter 20, then the meter is connected according to the direction defined in the manual. If they do not match, the current transformer direction is considered abnormal, and a reverse connection of the current transformer is reported.

[0278] Finally, suggestions for connecting users.

[0279] It is recommended that users swap CTk and CTx. If the above judgment indicates that the current transformer is reversed, it is recommended that users reverse CTx and adjust the direction of other CTs to be consistent with the direction of CTx.

[0280] See Figure 9 , Figure 9 This is a schematic diagram of an embodiment of the inverter provided in this application. The inverter 20 includes a processor 21, a communication module 22, and a memory 23. The memory 23 is used to store a computer program, which, when executed by the processor 21, is used to implement the following methods:

[0281] For each phase of the incoming line, the inverter outputs different first target power at at least two current angles according to the current phasor rotation method. At each current angle, the inverter acquires the power corresponding to the three-phase incoming line. The power of each phase is calculated from the current and voltage collected by its corresponding current transformer. The inverter determines the second target power corresponding to the first target power from the power corresponding to the three-phase incoming line and records the first sequence number of the current transformer corresponding to the second target power. The second target power is the power with the largest variation among the power corresponding to the three-phase incoming line. The inverter determines the target voltage corresponding to the first target power from the voltage on the three-phase incoming line and records the second sequence number of the target voltage. The phase of the target voltage matches the phase of the voltage corresponding to the target power. The inverter makes adjustment suggestions for the first, second, and third current transformers based on the first and second sequence numbers.

[0282] In some embodiments, the first target power includes active power and reactive power. When the computer program is executed by the processor 21, it is also used to implement the following method: for each phase of the household line, the step of outputting different first target power at three current angles according to the current phasor rotation method includes: for each phase of the household line, according to the current phasor rotation method, outputting the first active power and the first reactive power at current angles of 0 degrees, 120 degrees, or 240 degrees; obtaining the second active power and the second reactive power corresponding to each phase of the three-phase household line; and at current angles of 0 degrees, 120 degrees, or 240 degrees. At 240 degrees, output the third active power and the third reactive power; the third active power is different from the first active power; obtain the fourth active power and the fourth reactive power corresponding to each phase of the three-phase incoming line; based on the second active power and the second reactive power corresponding to each phase of the incoming line, and the fourth active power and the fourth reactive power corresponding to each phase of the incoming line, determine the second target power corresponding to the first active power or the third active power, and record the first serial number of the current transformer corresponding to the second target power; the second target power corresponds to the active power and reactive power of the incoming line.

[0283] In some embodiments, when the computer program is executed by the processor 21, it is further configured to implement the following method: obtain a first power change gradient of the current transformer corresponding to the phase of the household, and a second power change gradient of the current phase of the household; when the first power change gradient and the second power change gradient do not match, generate a first adjustment suggestion; wherein the first adjustment suggestion is: to reverse the current transformer on the phase of the household corresponding to the first number and set it on the corresponding phase of the household.

[0284] In some embodiments, when the computer program is executed by the processor 21, it is further configured to implement the following method: when the first serial number and the second serial number are different, generate a second adjustment suggestion; wherein the second adjustment suggestion is to interchange the current transformer on the phase-to-house line corresponding to the first serial number and the current transformer on the phase-to-house line corresponding to the second serial number.

[0285] In some embodiments, when the computer program is executed by the processor 21, it is also used to implement the methods of any of the above embodiments.

[0286] In summary, the power distribution system, current transformer detection method, and inverter provided in this application include: For each phase of the incoming line, the inverter outputs different first target power at at least two current angles according to the current phasor rotation method; at each current angle, it acquires the power corresponding to the three-phase incoming line; wherein the power of each phase incoming line is calculated from the current and corresponding voltage collected by its corresponding current transformer; a second target power corresponding to the first target power is determined from the power corresponding to the three-phase incoming line, and the first serial number of the current transformer corresponding to the second target power is recorded; wherein the second target power is the power with the largest variation among the power corresponding to the three-phase incoming line; and a target voltage corresponding to the first target power is determined from the voltage on the three-phase incoming line, and the second serial number corresponding to the target voltage is recorded; wherein the phase of the target voltage matches the phase of the voltage corresponding to the target power; and adjustment suggestions are made for the first, second, and third current transformers based on the first and second serial numbers. That is, by using the difference between the serial number corresponding to the current and the serial number corresponding to the voltage, it can determine whether the current transformer on the incoming line is set correctly, and thus provide correct connection suggestions for the current transformer. This makes it easier for users to adjust the current transformer directly according to the connection suggestions when the current transformer is set incorrectly, thereby improving adjustment efficiency.

[0287] In the several embodiments provided in this application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of circuits or units is merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0288] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0289] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0290] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural changes made based on the description and drawings of this application, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A power distribution system connected to a three-phase power grid, characterized in that, The power distribution system includes: The first current transformer, the second current transformer, and the third current transformer are respectively installed on different phases of the three-phase power grid's incoming lines and are configured to collect the current on the three-phase incoming lines. The first voltage sampling unit, the second voltage sampling unit, and the third voltage sampling unit are respectively connected to different phases of the three-phase power grid's incoming lines and are configured to collect the voltage on the three-phase incoming lines. The three-phase electricity meter is communicatively connected to the first current transformer, the second current transformer, the third current transformer, the first voltage sampling unit, the second voltage sampling unit, and the third voltage sampling unit, and is configured to receive the current and voltage on the three-phase incoming line. The inverter, installed on any one phase of the indoor line of the three-phase power grid, or installed on the three-phase indoor line of the three-phase power grid, is communicatively connected to the three-phase electricity meter and is configured as follows: For each phase of the three-phase power grid, according to the current phasor rotation method, the corresponding preset first target power of each phase is output in at least two current angles respectively. At each current angle, the power corresponding to each of the three-phase incoming lines is obtained; wherein, the power of each phase incoming line is calculated from the current collected by its corresponding current transformer and the voltage collected by its corresponding voltage sampling unit. From all the power corresponding to the three-phase incoming line, determine the second target power corresponding to each one, and record the first serial number of the current transformer corresponding to each second target power; wherein, the second target power is the power of a one-phase incoming line whose change in power corresponds to the preset difference expectation under the at least two current angles. And determine the target voltage corresponding to the first target power of each phase from the voltage collected from the three-phase incoming line, and record the second sequence number corresponding to the target voltage; wherein the phase corresponding to the target voltage matches the voltage phase corresponding to the first target power; Based on the first sequence number and the second sequence number, output adjustment suggestion information for adjusting the first current transformer, the second current transformer and the third current transformer.

2. The power distribution system according to claim 1, characterized in that, The first target power includes active power and reactive power, and the inverter is further configured to: For each phase of the incoming line, according to the current phasor rotation method, when the current angle is the first preset angle, the first active power and the first reactive power are output. Obtain the second active power and the second reactive power corresponding to each phase of the three-phase inlet circuit. When the current angle is the first preset angle, the third active power and the third reactive power are output; wherein the third active power is different from the first active power, and the third reactive power is different from the first reactive power; Obtain the fourth active power and the fourth reactive power corresponding to each phase of the three-phase inlet circuit; Based on the second active power and second reactive power corresponding to each phase of the incoming line, the fourth active power and fourth reactive power corresponding to each phase of the incoming line, the second target power corresponding to the first active power or the third active power is determined, and the first serial number of the current transformer corresponding to the second target power is recorded; wherein, the second target power corresponds to the active power and reactive power of the incoming line.

3. The power distribution system according to claim 2, characterized in that, The inverter is also configured to: For each phase of the incoming line, according to the current phasor rotation method, when the current angle is the second preset angle, the first active power and the first reactive power are output; the second preset angle is the first preset angle plus a preset angle. Obtain the second active power and the second reactive power corresponding to each phase of the three-phase inlet circuit. When the current angle is the second preset angle, the third active power and the third reactive power are output; wherein, the third active power is different from the first active power, and the third reactive power is different from the first reactive power; Obtain the fourth active power and the fourth reactive power corresponding to each phase of the three-phase inlet circuit; Based on the second active power and second reactive power corresponding to each phase of the incoming line, the fourth active power and fourth reactive power corresponding to each phase of the incoming line, the second target power corresponding to the first active power or the third active power is determined, and the first serial number of the current transformer corresponding to the second target power is recorded; wherein, the second target power corresponds to the active power and reactive power of the incoming line.

4. The power distribution system according to claim 3, characterized in that, The inverter is also configured to: For each phase of the incoming line, according to the current phasor rotation method, when the current angle is a third preset angle, the first active power and the first reactive power are output; the third preset angle is the preset angle added to the second preset angle. Obtain the second active power and the second reactive power corresponding to each phase of the three-phase inlet circuit. When the current angle is the third preset angle, the third active power and the third reactive power are output; wherein the third active power is different from the first active power, and the third reactive power is different from the first reactive power; Obtain the fourth active power and the fourth reactive power corresponding to each phase of the three-phase inlet circuit; Based on the second active power and second reactive power corresponding to each phase of the incoming line, the fourth active power and fourth reactive power corresponding to each phase of the incoming line, the second target power corresponding to the first active power or the third active power is determined, and the first serial number of the current transformer corresponding to the second target power is recorded; wherein, the second target power corresponds to the active power and reactive power of the incoming line.

5. The power distribution system according to any one of claims 1-4, characterized in that, The inverter is also configured to: Obtain the first power change gradient of the current transformer corresponding to the current phase entering the household, and the second power change gradient of the current phase entering the household. When the first power change gradient and the second power change gradient do not match, a first adjustment suggestion is generated; wherein, the first adjustment suggestion is: to reverse the current transformer on the corresponding phase of the first serial number to the corresponding phase of the incoming line.

6. The power distribution system according to any one of claims 1-4, characterized in that, The inverter is also configured to: When the first serial number and the second serial number are different, a second adjustment suggestion is generated; wherein, the second adjustment suggestion is to swap the current transformer on the phase-entry line corresponding to the first serial number and the current transformer on the phase-entry line corresponding to the second serial number.

7. A method for detecting a current transformer, characterized in that, A power distribution system for connecting a three-phase power grid includes an inverter, a first current transformer, a second current transformer, a third current transformer, a first voltage sampling unit, a second voltage sampling unit, a third voltage sampling unit, and a three-phase electricity meter. The inverter is installed on any one phase of the three-phase power grid's indoor line, or on the first, second, and third phase indoor lines of the three-phase power grid. The first, second, and third current transformers are respectively installed on different phases of the three-phase power grid's indoor lines and are configured as follows: The current on the three-phase incoming lines is collected separately; the first voltage sampling unit, the second voltage sampling unit, and the third voltage sampling unit are respectively connected to different phases of the three-phase power grid's incoming lines and are configured to collect the voltage on the three-phase incoming lines; the three-phase electricity meter is communicatively connected to the first current transformer, the second current transformer, the third current transformer, the first voltage sampling unit, the second voltage sampling unit, the third voltage sampling unit, and the inverter, and is configured to receive the current and voltage on the three-phase incoming lines; the detection method includes: The inverter outputs the corresponding preset first target power for each phase of the three-phase power grid's incoming line at at least two current angles, according to the current phasor rotation method. The inverter acquires the power corresponding to each of the three-phase incoming lines at each current angle; wherein, the power of each phase incoming line is calculated from the current collected by its corresponding current transformer and the voltage collected by its corresponding voltage sampling unit. The inverter determines the second target power corresponding to each of the three-phase incoming lines from all the power corresponding to each, and records the first serial number of the current transformer corresponding to each second target power; wherein, the second target power is the power of a single-phase incoming line whose change in power corresponds to the preset difference expectation among the power corresponding to the at least two current angles. The inverter determines the target voltage corresponding to the first target power of each phase from the voltage collected from the three-phase incoming line, and records the second sequence number corresponding to the target voltage; wherein the phase corresponding to the target voltage matches the voltage phase corresponding to the first target power. The inverter outputs adjustment suggestion information for adjusting the first current transformer, the second current transformer, and the third current transformer based on the first sequence number and the second sequence number.

8. The detection method according to claim 7, characterized in that, The first target power includes active power and reactive power. The inverter outputs the corresponding preset first target power for each phase of the three-phase power grid at at least two current angles according to the current phasor rotation method. For each phase of the incoming line, according to the current phasor rotation method, when the current angle is a first preset angle, a second preset angle, or a third preset angle, the corresponding first active power and first reactive power are output; wherein, the second preset angle is the first preset angle plus a preset angle; the third preset angle is the second preset angle plus the preset angle. Obtain the second active power and the second reactive power corresponding to each phase of the three-phase inlet circuit. When the current angle is the first preset angle, the second preset angle, or the third preset angle, a third active power and a third reactive power are output; wherein, the third active power is different from the first active power; Obtain the fourth active power and the fourth reactive power corresponding to each phase of the three-phase inlet circuit; Based on the second active power and second reactive power corresponding to each phase of the incoming line, the fourth active power and fourth reactive power corresponding to each phase of the incoming line, the second target power corresponding to the first active power or the third active power is determined, and the first serial number of the current transformer corresponding to the second target power is recorded; wherein, the second target power corresponds to the active power and reactive power of the incoming line.

9. The detection method according to any one of claims 7-8, characterized in that, The method further includes: The inverter obtains the first power change gradient of the current transformer corresponding to the current phase of the household line and the second power change gradient of the current phase of the household line. When the first power change gradient and the second power change gradient do not match, the inverter generates a first adjustment suggestion; wherein, the first adjustment suggestion is: to reverse the current transformer on the corresponding phase of the first serial number to the corresponding phase of the incoming line.

10. The detection method according to claim 7, characterized in that, The step of the inverter outputting adjustment suggestion information for adjusting the first current transformer, the second current transformer, and the third current transformer based on the first sequence number and the second sequence number includes: When the first serial number and the second serial number are different, the inverter generates a second adjustment suggestion; wherein, the second adjustment suggestion is to swap the current transformer on the phase-to-house line corresponding to the first serial number and the current transformer on the phase-to-house line corresponding to the second serial number.

11. An inverter, characterized in that, The inverter includes a processor, a communication module, and a memory, the memory being used to store a computer program, which, when executed by the processor, is used to implement the method as described in any one of claims 7-10.

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