Wiring detection method, device and equipment of converter system and medium

Abstract

The invention discloses a wiring detection method, device and equipment of a converter system and a medium, the converter system comprises a confluence switching control device and at least one converter, and the confluence switching control device comprises a first interface group and a plurality of phase control switches respectively corresponding to each interface in the first interface group. The converter comprises a plurality of second interface groups correspondingly connected with the first interface groups through phase lines, the phase control switches are used for controlling the conduction relation between the converter and an alternating current power grid, and the wiring detection method comprises the following steps: when the alternating current power grid supplies power to the confluence switching control device, controlling the first number of phase control switches to be closed; obtaining first interface voltages of all the interfaces in the first interface group and second interface voltages of all the interfaces in the second interface group; and determining a wiring detection result of each converter according to the first interface voltage and all second interface voltages with the same phase as the first interface voltage. According to the embodiment of the invention, the wiring condition of the converter can be accurately and timely judged.

Description

Technical Field

[0001] The present invention relates to the field of power electronics technology, and in particular to a wiring detection method, device, equipment and medium for a converter system. Background Art

[0002] In some power systems that can be connected to or off-grid, the accuracy of wiring detection is crucial to ensure the stable operation of the system. For example, the current converter system usually uses two-phase or three-phase power supply, with a large number of phase lines, and the phase line interfaces of the converter and the confluence switching control device are the same or similar in appearance, which leads to the easy occurrence of phase line wiring errors between the converter and the confluence switching control device. If it is not discovered and resolved in time before the system is started, it will cause the system to run unstably or even damage the converter, which will have a serious impact on the safety and reliability of the system. Summary of the invention

[0003] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a method, device, equipment and medium for detecting wiring of a converter system, which can accurately and timely judge the wiring condition of the converter.

[0004] In a first aspect, an embodiment of the present invention provides a wiring detection method for a converter system, wherein the converter system includes a phase line, a busbar switching control device, and at least one converter, wherein the busbar switching control device includes a first interface group, and a plurality of phase control switches corresponding to each interface in the first interface group, wherein the converter includes a plurality of second interface groups correspondingly connected to the first interface group through the phase line, wherein the phase control switch is used to control the conduction relationship between the converter and the AC power grid, and wherein the wiring detection method includes: When the AC power grid supplies power to the convergence switching control device, a first number of the phase control switches are controlled to be closed, wherein the first number is less than the number of all interfaces in the first interface group; Acquire first interface voltages of all interfaces in the first interface group, and second interface voltages of all interfaces in the second interface group; The connection detection result of each of the converters is determined according to the first interface voltage and all the second interface voltages which are in phase with the first interface voltage.

[0005] The wiring detection method for the converter system provided in accordance with the embodiment of the present invention has at least the following beneficial effects: since the interface voltages of the connections using the same phase line should be consistent, when the AC power grid supplies power to the convergence switching control device, by closing only some of the phase control switches, the interfaces corresponding to some of the phase lines are energized, while the interfaces corresponding to other phase lines are not energized, thereby causing differences in the interface voltages of some interfaces. By obtaining the interface voltages of all interfaces and comparing the interface voltages of the same phase, the wiring conditions of each converter can be quickly, accurately and comprehensively determined.

[0006] In the wiring detection method provided in an embodiment of the present invention, determining the wiring detection result of each of the converters according to the first interface voltage and all the second interface voltages in phase with the first interface voltage includes: When the first interface voltage is consistent with all the second interface voltages in phase with the first interface voltage, controlling all the phase control switches to be closed; Reacquiring first interface voltages of all interfaces in the first interface group and second interface voltages of all interfaces in the second interface group; The connection detection result of each of the converters is determined again according to the first interface voltage and all the second interface voltages that are in phase with the first interface voltage.

[0007] In the wiring detection method provided in an embodiment of the present invention, determining the wiring detection result of each of the converters according to the first interface voltage and all the second interface voltages in phase with the first interface voltage includes: When the second interface voltage is inconsistent with the first interface voltage which is in phase with the second interface voltage, it is determined that the connection of the converter corresponding to the second interface voltage is abnormal.

[0008] In the wiring detection method provided in an embodiment of the present invention, determining the wiring detection result of each of the converters according to the first interface voltage and all the second interface voltages in phase with the first interface voltage includes: When the first interface voltage is consistent with all the second interface voltages in phase with the first interface voltage, controlling all the phase control switches to be closed; Acquire a first phase sequence of the convergence switching control device in the first interface group, and a second phase sequence of all converters in the second interface group; According to the first phase sequence and all the second phase sequences, a connection detection result of each of the converters is determined.

[0009] In the wiring detection method provided in the embodiment of the present invention, determining the wiring detection result of each of the converters according to the first phase sequence and all the second phase sequences includes: When the second phase sequence does not match the first phase sequence, determining that the current transformer connection corresponding to the second phase sequence is abnormal; or, When the second phase sequence matches the first phase sequence, it is determined that the connection of the converter corresponding to the second phase sequence is normal.

[0010] In the wiring detection method provided by the embodiment of the present invention, when there are at least three phase control switches and the first number is one, determining the wiring detection result of each of the converters according to the first interface voltage and all the second interface voltages in phase with the first interface voltage includes: When the first interface voltage is consistent with all the second interface voltages in phase with the first interface voltage, adding a mark to the currently closed phase control switch; Selecting one of the phase-controlled switches to which no mark is added as a target phase-controlled switch, and controlling the target phase-controlled switch to be closed; Reacquiring first interface voltages of all interfaces in the first interface group and second interface voltages of all interfaces in the second interface group; The connection detection result of each of the converters is determined again according to the first interface voltage and all the second interface voltages that are in phase with the first interface voltage.

[0011] In the wiring detection method provided in the embodiment of the present invention, the controlling the target phase control switch to be closed includes: When there are a plurality of the phase control switches with added marks, at least one of the phase control switches with added marks is controlled to be opened, and the target phase control switch is controlled to be closed.

[0012] In a second aspect, an embodiment of the present invention provides an operation control device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the wiring detection method of the converter system as described in the embodiment of the first aspect above.

[0013] The operation control device provided according to the embodiment of the present invention has at least the following beneficial effects: since the interface voltages connected using the same phase line should be consistent, when the AC power grid supplies power to the convergence switching control device, by closing only some of the phase control switches, the interfaces corresponding to some of the phase lines are energized, and the interfaces corresponding to other phase lines are not energized, thereby causing differences in the interface voltages of some interfaces. By obtaining the interface voltages of all interfaces and comparing the interface voltages of the same phase, the wiring conditions of each converter can be quickly, accurately and comprehensively determined.

[0014] In a third aspect, an embodiment of the present invention provides a wiring detection device, comprising an operation control device as described in the embodiment of the second aspect above.

[0015] The wiring detection device provided according to the embodiment of the present invention has at least the following beneficial effects: since the interface voltages of the connections using the same phase line should be consistent, when the AC power grid supplies power to the convergence switching control device, by closing only some of the phase control switches, the interfaces corresponding to some of the phase lines are energized, while the interfaces corresponding to other phase lines are not energized, thereby causing differences in the interface voltages of some interfaces. By obtaining the interface voltages of all interfaces and comparing the interface voltages of the same phase, the wiring conditions of each converter can be quickly, accurately and comprehensively determined.

[0016] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the wiring detection method for the converter system as described in the embodiment of the first aspect.

[0017] The computer-readable storage medium provided in accordance with the embodiment of the present invention has at least the following beneficial effects: since the interface voltages connected using the same phase line should be consistent, when the AC power grid supplies power to the convergence switching control device, by closing only some of the phase control switches, the interfaces corresponding to some of the phase lines are energized, while the interfaces corresponding to other phase lines are not energized, thereby causing differences in the interface voltages of some interfaces. By obtaining the interface voltages of all interfaces and comparing the interface voltages of the same phase, the wiring conditions of each converter can be quickly, accurately and comprehensively determined.

[0018] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0020] The present invention is further described below in conjunction with the accompanying drawings and embodiments; Figure 1 is a schematic structural diagram of a converter system provided by an embodiment of the present invention; Figure 2 is a connection diagram of a converter system provided by an embodiment of the present invention in a grid-connected and off-grid parallel scenario; Figure 3 It is a connection diagram of the converter system provided by an embodiment of the present invention in a grid-connected and off-grid single machine scenario; Figure 4 is a flow chart of a wiring detection method for a converter system provided by an embodiment of the present invention; Figure 5 yes Figure 4 The specific flow chart of step 130 is shown; Figure 6 yes Figure 4 Another specific flow chart of step 130 is shown; Figure 7 yes Figure 4 Another specific flow chart of step 130 is shown; Figure 8 yes Figure 7 The specific flow chart of step 430 is shown; Fig. 9 yes Figure 4 Another specific flow chart of step 130 is shown; Fig.10 yes Fig. 9 The specific flow chart of step 620 is shown; Fig.11 It is a schematic diagram of the overall process of the grid-connected startup wiring detection of the converter system provided by an embodiment of the present invention; Fig.12 It is a structural schematic diagram of the operation control device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0021] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0022] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, "above", "below", "within", etc. are understood to include the number itself, "any one" means one or more, "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. If there is a description of the first and the second, it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0023] It should be noted that the terms such as setting, installing, and connecting in the embodiments of the present invention should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the embodiments of the present invention in combination with the specific content of the technical solution. For example, the term "connection" can be a mechanical connection, an electrical connection, or mutual communication; it can be directly connected or indirectly connected through an intermediate medium.

[0024] It should be noted that the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] In some power systems that can be connected to or off-grid, the accuracy of wiring detection is crucial to ensure the stable operation of the system. For example, the current converter system usually uses two-phase or three-phase power supply, with a large number of phase lines, and the phase line interfaces of the converter and the confluence switching control device are the same or similar in appearance, which leads to the easy occurrence of phase line wiring errors between the converter and the confluence switching control device. If it is not discovered and resolved in time before the system is started, it will cause the system to run unstably or even damage the converter, which will have a serious impact on the safety and reliability of the system.

[0026] Based on this, an embodiment of the present invention proposes a wiring detection method, device, equipment and medium for a converter system. Since the interface voltages of the same phase line wiring should be consistent, in the grid-connected scenario of the converter system, by closing some phase control switches, the interfaces corresponding to the wiring of some phase lines are in a energized state, and the interfaces corresponding to the other phase lines are in a non-energized state. Therefore, in the grid-connected scenario of the converter system, the interface voltages of some interfaces can be different. By obtaining the interface voltages of all interfaces and comparing the interface voltages under the same phase, the wiring conditions of each converter can be quickly, accurately and comprehensively determined.

[0027] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0028] Reference Figure 1 , Figure 1is a structural diagram of a converter system provided by an embodiment of the present invention. It can be understood that the converter system includes a convergence switching control device 100, a local system controller (LC), and at least one converter 200. Among them, the convergence switching control device 100 is provided with a grid interface group 300, a load interface group 400 and a first interface group 110. The grid interface group 300 can be used to connect to the AC power grid to obtain the power supply of the AC power grid. The number of interfaces in the grid interface group 300 is determined based on the power supply method adopted by the AC power grid. For example, the AC power grid adopts a three-phase four-wire power supply method, and the grid interface group 300 has four interfaces corresponding to the A phase line, the B phase line, the C phase line and the ground line of the AC power grid; and the first interface group 110 is used to connect to the converter 200, and the first interface group 110 includes a plurality of interfaces corresponding to the power supply of the AC power grid.

[0029] A phase control switch 120 is also provided in the convergence switching control device 100, and each interface in the first interface group 110 is connected one-to-one with each phase control switch 120, that is, each interface in the first interface group 110 is correspondingly connected to one end of the phase control switch 120, and the other end of the phase control switch 120 is connected to the interface in the grid interface group 300; in addition, the load interface group 400 is used to simultaneously connect the other end of the phase control switch 120 and the grid interface group 300, and the load interface group 400 is connected to the connection point between the phase control switch 120 and the grid interface group 300, so that the power provided by the AC power grid and / or the converter 200 can be obtained.

[0030] It should be noted that the grid interface group 300 can be connected to the corresponding phase control switch 120 through the grid control switch 310, so that the grid connection and disconnection of the converter system can be achieved by controlling the closing or opening of the grid control switch 310, and whether the AC power grid supplies power to the convergence switching control device 100 can also be realized; and the load interface group 400 can be connected to the connection point between the phase control switch 120 and the grid control switch 310 through the load control switch 410, so that by controlling the load control switch 410, whether the load is powered by the AC power grid and / or the converter 200 can be controlled.

[0031] The number of converters 200 in the converter system may be one or more, and the converter 200 includes a second interface group 210, which includes multiple interfaces corresponding to the AC power grid. The second interface group 210 is connected to the first interface group 110 through a phase line. That is to say, when the convergence switching control device 100 and the AC power grid adopt three-phase power transmission, the second interface group 210 may include a second A interface, a second B interface, and a second C interface. When the wiring is normal, the second A interface is connected to the first A interface through an A phase line, the second B interface is connected to the first B interface through a B phase line, and the second C interface is connected to the first C interface through a C phase line. When the grid interface group 300, the first interface group 110, and the load interface group 400 all include interfaces for connecting the ground wire, the converter 200 may also be provided with a ground wire interface for connecting the ground wire. It is worth noting that the number of interfaces of the grid interface group 300, the load interface group 400, the first interface group 110, and the second interface group 210 on the converter 200 can be consistent.

[0032] Reference Figure 2 , Figure 2 It is a connection diagram of the converter system provided by an embodiment of the present invention in the on-grid and off-grid parallel scenario. In the on-grid and off-grid parallel scenario, the converter system means that there are multiple converters 200 in the converter system, and the second interface group 210 of each converter 200 is connected to the corresponding interface in the first interface group 110 according to the phase corresponding to each interface, and the convergence switching control device 100 can connect the converter system to the AC power grid or disconnect it from the AC power grid through the grid control switch 310. Among them, the converter 200 can refer to a power storage converter (Power Conversion System, PCS), which can be referred to Figure 1 , multiple energy storage converters (PCS_1 to PCS_n) are simultaneously connected to the convergence switching control device 100 through their respective second interface groups 210, which is equivalent to each energy storage converter being connected in parallel to the convergence switching control device 100. In addition, the converter 200 can also be replaced by power generation equipment such as an inverter and a wind power converter.

[0033] Reference Figure 3 , Figure 3It is a connection diagram of the converter system provided by an embodiment of the present invention in a grid-connected and off-grid stand-alone scenario. The converter system in the grid-connected and off-grid stand-alone scenario means that there is only one converter 200 in the converter system, and the second interface group 210 of the converter 200 is also connected to the interface in the first interface group 110 according to the phase corresponding to each interface. Therefore, it is only necessary to determine whether each interface in the second interface group 210 of a converter 200 is wired normally. In the grid-connected and off-grid stand-alone scenario, the convergence switching control device 100 can also connect the converter system to or disconnect from the AC grid through the grid control switch 310.

[0034] It should be noted that, in a scenario where the converter system is connected to the grid, the busbar switching control device 100 may be a grid-connected or off-grid control device.

[0035] It can be understood by those skilled in the art that Figures 1 to 3 The structure of the converter system shown in the figure does not constitute a limitation on the embodiments of the present invention, and may include more or less components than those shown in the figure, or combine certain components, or arrange the components differently.

[0036] Reference Figure 4 , Figure 4 is a flow chart of a wiring detection method for a converter system provided by an embodiment of the present invention. The wiring detection method for a converter system can be applied to Figure 1 or Figure 2 or Figure 3 The inverter system shown in the figure, the wiring detection method includes but is not limited to the following steps: Step S110: When the AC power grid supplies power to the bus switching control device, a first number of phase control switches are controlled to be closed; Step S120: acquiring first interface voltages of all interfaces in the first interface group, and second interface voltages of all interfaces in the second interface group; Step S130: determining the connection detection result of each converter according to the first interface voltage and all second interface voltages in phase with the first interface voltage.

[0037] It is understandable that when it is detected that the grid interface group of the convergence switching control device is energized and each grid control switch is closed, it can be considered that the AC grid supplies power to the convergence switching control device, and the converter system can be controlled to be connected to the grid, so that the converter in the converter system can obtain and store electrical energy from the AC grid. When controlling the converter system to be connected to the grid, it is necessary to detect the wiring between the converter and the convergence switching control device to avoid system instability or converter damage due to abnormal converter wiring.

[0038] By closing a first number of phase control switches, since the first number is less than the number of all interfaces in the first interface group, that is, only some of the phase control switches are closed, the convergence switching control device can obtain power through the AC power grid, so that the interfaces corresponding to the closed phase control switches in the first interface group are in a energized state, and the voltage of the interface is consistent with the phase voltage of the AC power grid at the corresponding phase of the interface, while the interfaces corresponding to the disconnected phase control switches in the first interface group are in a non-energized state. At this time, the interfaces in the first interface group show that there are differences in the interface voltages of some interfaces, and the interfaces in the first interface group form a specific voltage distribution state, providing a basis for subsequent wiring detection.

[0039] After controlling the conduction state of each phase control switch, the voltage of each port between the confluence switching control device and each converter is measured, that is, multiple first interface voltages and multiple second interface voltages, and then by comparing the voltage values ​​at the same-phase interface, it can be determined whether the connection between the corresponding converter and the confluence switching control device is correct. Since the voltage between the two interfaces connected to the same phase line should be consistent, if the voltage values ​​at the same-phase interface are consistent, it indicates that the connection is normal. If the voltage values ​​of the same-phase interface are greatly different, it may indicate abnormal connection. That is to say, by comparing the first interface voltage and all the second interface voltages under the same phase, it can be determined whether the converter to which the second interface voltage belongs and the confluence switching control device are connected normally, and the connection detection result of the converter is obtained.

[0040] In the grid-connected scenario of the converter system, by closing some phase control switches, the interfaces corresponding to some phase lines are energized, and the interfaces corresponding to other phase lines are de-energized, resulting in differences in the interface voltages of some interfaces. By obtaining the interface voltages of all interfaces and comparing the interface voltages of the same phase, the wiring conditions of each converter can be quickly, accurately and comprehensively determined.

[0041] It should be noted that, for each second interface voltage, the second interface voltage is compared with the first interface voltage of the same phase. If the second interface voltage is inconsistent with the first interface voltage of the same phase, it can be considered that the inverter wiring corresponding to the second interface voltage is abnormal, which is equivalent to taking the first interface voltage of each interface in the first interface group as a reference, comparing the second interface voltage of each interface in each second interface group, and determining the wiring detection result of each inverter. Specifically, the difference between the second interface voltage and the first interface voltage of the same phase can be calculated to obtain the interface voltage difference. When the interface voltage difference is greater than the preset voltage difference, it can be considered that the two interface voltages are inconsistent, and when the interface voltage difference is less than or equal to the preset voltage difference, it can be considered that the two interface voltages are consistent.

[0042] When the converter system includes multiple converters, there are also multiple second interface voltages for the same phase. At this time, when the wiring between each converter and the convergence switching control device is normal, for each phase, the multiple second interface voltages of the same phase are consistent and are all consistent with the first interface voltage of the same phase.

[0043] When there is only one converter in the converter system, it is only necessary to obtain the second interface voltage of the second interface group of the converter, and the first interface voltage and the second interface voltage of the same phase can be compared to determine the wiring detection results of each interface in the second interface group. When the first interface voltage is inconsistent with the second interface voltage of the same phase, it can be directly determined that the interface wiring error corresponding to the second interface voltage is wrong. For example, the first A interface of phase A in the first interface group of the convergence switching control device is in a energized state, while the second A interface of phase A in the second interface group of the converter is in a non-energized state, that is, the first interface voltage of phase A is inconsistent with the second interface voltage of the same phase, indicating that the second A interface wiring error is wrong; and if only one phase control switch is controlled to be closed, the first B interface of phase B in the first interface group is in a energized state, and the second B interface of phase B in the second interface group of the converter is also in a energized state, because the phase voltage amplitude provided by the AC power grid to each phase is equal, therefore, when the second B interface of the converter has no power supply other than the AC power grid, the second B interface is also in a energized state, then it can be considered that the first interface voltage of phase B is consistent with the second interface voltage of the same phase, and the second B interface wiring is normal.

[0044] It is worth noting that when the AC power grid adopts three-phase three-wire to power the convergence switching control device, the first interface voltage and the second interface voltage obtained may refer to the line voltage, that is, the voltage Uab between phase A and phase B, the voltage Ubc between phase B and phase C, and the voltage Uca between phase C and phase A; and when the AC power grid adopts a two-phase three-wire (split-phase) system to power the convergence switching control device, the first interface voltage and the second interface voltage obtained may refer to the split-phase voltage generated between the two-phase power supply.

[0045] Reference Figure 5 , a wiring detection method provided by an embodiment of the present invention, Figure 4 In step S130 shown, the wiring detection method further includes steps S210 to S230: Step S210: When the first interface voltage is consistent with all second interface voltages in phase with the first interface voltage, control all phase control switches to close; Step S220: reacquiring first interface voltages of all interfaces in the first interface group and second interface voltages of all interfaces in the second interface group; Step S230: determining the connection detection result of each converter again according to the first interface voltage and all second interface voltages in phase with the first interface voltage.

[0046] It can be understood that, in the initial detection, only the first number of phase control switches are controlled to close to form a specific voltage distribution state in the first interface voltage of the first interface group. At this time, if the preliminary detection result is normal, that is, the first interface voltage is consistent with all second interface voltages of the same phase, then all phase control switches are controlled to close, so that all interfaces in the first interface group are connected to the AC power grid to supply power to the converter.

[0047] By closing all phase control switches, it can be verified whether all interfaces in each second interface group remain consistent when all interfaces in the first interface group are energized. This helps to discover potential wiring problems that may be caused by phase control switches that are not closed during initial detection, including incorrect wiring phase sequence, open circuit, etc. Moreover, after all phase control switches are closed, the voltage distribution of the first interface voltage of the first interface group changes, and at the same time, the second interface voltage of the second interface group corresponding to the first interface group also changes accordingly. Therefore, the first interface voltage of all interfaces in the first interface group and the second interface voltage of all interfaces in each second interface group are re-acquired and updated. After obtaining the new interface voltage, it is necessary to compare the second interface voltages of the same phase with the first interface voltage of each phase as the reference again to determine the wiring detection results of each converter. Therefore, by first closing some phase control switches for initial voltage detection and then closing all phase control switches for voltage detection again, the wiring conditions of each converter can be more comprehensively evaluated to ensure the stable operation of the system. The action strategy of the wiring detection is also compatible with the action strategy of the converter system grid-connected process, and can perform wiring detection synchronously when the converter system is grid-connected, reducing the additional actions performed due to wiring detection.

[0048] Reference Figure 6 , a wiring detection method provided by an embodiment of the present invention, Figure 4 Step S130 shown or Figure 5 In the step S230 shown, the wiring detection method further includes step S310: Step S310: When the second interface voltage is inconsistent with the first interface voltage that is in phase with the second interface voltage, it is determined that the inverter connection corresponding to the second interface voltage is abnormal.

[0049] It can be understood that, since the first interface voltage is provided by the AC power grid to the first interface group of the convergence switching control device, the first interface voltage can be used as a reference value for voltage detection, that is, each first interface voltage is accurate. If there is any second interface voltage that is inconsistent with the first interface voltage of the same phase, that is, there is an interface voltage difference between a second interface voltage and the first interface voltage of the same phase that is greater than the preset voltage difference, it can be considered that the converter system wiring is abnormal, for example, the converter corresponding to the second interface voltage is connected to the wrong interface, is broken, etc. Therefore, the converter corresponding to the second interface voltage that is inconsistent with the first interface voltage of the same phase can be determined as a converter with abnormal wiring.

[0050] Reference Figure 7 , a wiring detection method provided by an embodiment of the present invention, Figure 4 In the step S130 shown, the wiring detection method further includes steps S410 to S430: Step S410: When the first interface voltage is consistent with all second interface voltages in phase with the first interface voltage, control all phase control switches to close; Step S420: obtaining a first phase sequence of the bus switching control device in the first interface group, and a second phase sequence of all converters in the second interface group; Step S430: Determine the connection detection result of each converter according to the first phase sequence and all the second phase sequences.

[0051] It can be understood that, in the initial detection, only the first number of phase control switches are controlled to close to form a specific voltage distribution state in the first interface voltage of the first interface group. At this time, if the preliminary detection result is normal, that is, the first interface voltage is consistent with all second interface voltages of the same phase, then all phase control switches are controlled to close, so that all interfaces in the first interface group are connected to the AC power grid to supply power to the converter.

[0052] By closing all phase control switches, the phase sequence in the first interface group and the phase sequence in each second interface group can be detected. Specifically, the first phase sequence and the second phase sequence can be measured by a phase sequence measuring tool or method (such as a three-phase phase volt-ampere meter, etc.). The first phase sequence of the first interface group represents the phase sequence of the power supply of the AC power grid connected to the confluence switching control device, and the second phase sequence of the second interface group represents the phase sequence of the power supply obtained by each converter from the confluence switching control device. By comparing the first phase sequence and each second phase sequence, it is possible to accurately determine whether the wiring of each converter is normal, which helps to find the wiring phase sequence error that may be caused by the phase control switch that is not closed in the initial detection. Specifically, since the amplitude of the voltage provided by the AC power grid to each first interface is consistent, if there are multiple closed phase control switches in the initial detection, that is, the first number is multiple, even if the first interface voltage of the corresponding phase of the closed phase control switch is consistent with the second interface voltage of the same phase, it is impossible to determine whether there is a reverse connection between the multiple phases corresponding to the multiple closed phase control switches.

[0053] Specifically, the first interface group includes a first A interface corresponding to phase A, a first B interface corresponding to phase B, and a first C interface corresponding to phase C, and correspondingly, the second interface group includes a second A interface corresponding to phase A, a second B interface corresponding to phase B, and a second C interface corresponding to phase C. If the second A interface is incorrectly connected to the first B interface, the second B interface is also incorrectly connected to the first A interface. At this time, when the first number is two, after closing the phase control switches corresponding to phase A and phase B, the first interface voltage of the first A phase interface, the second interface voltage of the second A interface, the first interface voltage of the first B phase interface, and the second interface voltage of the second B interface are all consistent, and it is impossible to determine whether there is a reverse connection between the multiple phases corresponding to the multiple closed phase control switches. Therefore, whether the first phase sequence of the first interface group and the second phase sequence of each second interface group are consistent is used to determine whether each converter is correctly wired.

[0054] Reference Figure 8 , a wiring detection method provided by an embodiment of the present invention, Figure 7 In the step S430 shown, the wiring detection method further includes steps S510, S520 or S530: Step S510: taking the first phase sequence as a reference, comparing all the second phase sequences in sequence, determining the comparison results of each second phase sequence, and executing step S520 or step S530; Step S520: When the comparison result is that the current second phase sequence does not match the first phase sequence, it is determined that the current transformer connection corresponding to the current second phase sequence is abnormal; Step S530: When the comparison result is that the current second phase sequence matches the first phase sequence, it is determined that the current connection of the converter corresponding to the current second phase sequence is normal.

[0055] It can be understood that, taking the first phase sequence as the basis for phase sequence judgment, the first phase sequence is compared with each second phase sequence in turn. If the second phase sequence of a certain inverter matches the first phase sequence, it can be considered that the wiring of the inverter is correct; if the second phase sequence of a certain inverter does not match the first phase sequence, it can be considered that there is an abnormality in the wiring of the inverter.

[0056] It should be noted that the phase of the first interface voltage of each interface in the first interface group and the phase of the second interface voltage of each interface in the second interface group can also be obtained to determine whether the phase relationship between the first interface voltage of the first interface group and the second interface voltage of the second interface group meets specific phase requirements, which can assist in determining whether the wiring of each interface in the second interface group is correct.

[0057] Reference Fig. 9 , a wiring detection method provided by an embodiment of the present invention, Figure 4 In the step S130 shown, the wiring detection method further includes steps S610 to S640: Step S610: when the first interface voltage is consistent with all second interface voltages in phase with the first interface voltage, adding a mark to the currently closed phase control switch; Step S620: selecting a phase control switch from the phase control switches that have not been marked as a target phase control switch, and controlling the target phase control switch to be closed; Step S630: reacquire the first interface voltages of all interfaces in the first interface group and the second interface voltages of all interfaces in the second interface group; Step S640: determining the connection detection result of each converter again according to the first interface voltage and all second interface voltages in phase with the first interface voltage.

[0058] It can be understood that, since when only one phase control switch is closed, only one interface in the first interface group is in a powered state, and each interface in each second interface group is respectively connected to an interface in the first interface group, that is, only one interface in each second interface group should be in a powered state. Therefore, if the first interface voltage is consistent with the second interface voltage of the same phase, it can be determined that the interface wiring corresponding to the second interface voltage is correct, that is, the interface wiring corresponding to the closed phase control switch is correct.

[0059] When multiple phases are involved, each phase control switch can be closed in sequence. When a phase control switch is closed and the first interface voltage is consistent with the second interface voltage of the same phase, it can be determined that the interface wiring corresponding to the currently closed phase control switch is correct, and the currently closed phase control switch is marked. At this time, the phase control switch without a mark means that the wiring detection is not performed in the closed state. Therefore, in this state, a phase control switch that has never been closed is selected to be closed, and the first interface voltages of all interfaces in the first interface group at the current moment and the second interface voltages of all interfaces in the second interface group are obtained. The first interface voltage is compared with all second interface voltages of the same phase again. If the first interface voltage is consistent with the second interface voltage of the same phase at this time, it can be determined that the interface wiring corresponding to the currently closed phase control switch is correct. Otherwise, it can be determined that the interface wiring corresponding to the currently closed phase control switch is abnormal.

[0060] Reference Fig.10 , a wiring detection method provided by an embodiment of the present invention, Fig. 9 In the step S620 shown, the wiring detection method further includes step S710: Step S710: when there are multiple phase control switches with added marks, control at least one phase control switch with added marks to be opened, select a phase control switch from the phase control switches without added marks as the target phase control switch, and control the target phase control switch to be closed.

[0061] It can be understood that in the scenario of three-phase four-wire power supply system, each phase control switch can be closed in sequence. When one phase control switch is closed, all other phase control switches are disconnected, which is equivalent to disconnecting all marked phase control switches and closing only the target phase control switch, and then re-obtaining the first interface voltage of all interfaces in the first interface group and the second interface voltage of all interfaces in the second interface group. By comparing the first interface voltage with all second interface voltages of the same phase again, it is possible to accurately determine whether the interface of the phase corresponding to each phase control switch of the converter is wired incorrectly. By adding a mark to the currently closed phase control switch and selecting the target phase control switch from the phase control switch that has not been marked, the repeated closing of the same phase control switch can be reduced, saving the wiring detection process.

[0062] After closing the target phase control switch, if the second interface voltage is inconsistent with the first interface voltage of the same phase, the converter corresponding to the second interface voltage can be determined as a converter with abnormal wiring; if the first interface voltage and all second interface voltages of the same phase as the first interface voltage are consistent, it can be considered that the phase wiring of each converter corresponding to the target phase control switch is correct, and the other phase control switches can be controlled to close, so as to detect the wiring conditions of each converter in other phases again.

[0063] It is understandable that the number of marked phase control switches can also be checked first. This number should be equal to the total number of phase control switches minus two. Since the currently closed target phase control switch is not marked, this means that in addition to the currently closed target phase control switch, only another unmarked phase control switch has not been verified, and the wiring condition of the phase corresponding to the marked phase control switch has been detected. At the same time, the wiring condition of the phase corresponding to the current target phase control switch has also been detected. Reviewing the first interface voltage and the second interface voltage obtained after each control of the target phase control switch is closed, if the first interface voltage obtained after each control of the target phase control switch is closed and all second interface voltages with the same phase as the first interface voltage are consistent, it means that the wiring of each converter in all phases is normal.

[0064] Specifically, when the AC power grid uses a three-phase four-wire power supply method to supply power to the convergence switching control device, the convergence switching control device includes an A-phase control switch, a B-phase control switch, and a C-phase control switch. The A-phase control switch can be used as the target phase control switch, and the A-phase control switch can be controlled to close, and the first interface voltage of the first interface group and the second interface voltage of each second interface group can be obtained after the A-phase control switch is closed. It is worth noting that the phase control switch corresponding to the ground line remains closed.

[0065] If the first interface voltage is consistent with all the second interface voltages of the same phase (i.e., only the interface corresponding to phase A in the first interface group and the second interface group is energized), it can be considered that the connection between each converter and the convergence switching control device in phase A is normal. If any second interface voltage is inconsistent with the first interface voltage of the same phase, it can be considered that the converter corresponding to the second interface voltage inconsistent with the first interface voltage of the same phase has abnormal connection in phase A, and then, a mark is added to the phase A control switch. At this time, the phase control switches that are not marked include the phase B control switch and the phase C control switch, so one phase control switch can be arbitrarily selected from the phase B control switch and the phase C control switch as the new target phase control switch, and a new round of wiring detection can be performed.

[0066] Taking the B-phase control switch as the new target phase control switch as an example, the B-phase control switch is closed, and when the B-phase control switch is closed, if any interface corresponding to B is in an unpowered state, or any interface corresponding to phase other than B is in a powered state, it can be considered that the converter corresponding to the interface has abnormal wiring in phase B; if only the interface corresponding to phase B in the first interface group and the second interface group is in a powered state, it can be considered that the wiring between each converter and the convergence switching control device in phase B is normal. At the same time, since the number of phase control switches marked is the same as that of the phase control switches marked with the same number of phases, the number of phase control switches marked with the same number of phases is the same as that of the phase control switches marked with the same number of phases. The total number of control switches is reduced by two. If, when the A-phase control switch is closed, the first interface voltage is consistent with all the second interface voltages of the same phase, it can be considered that the wiring between each converter and the convergence switching control device in phases A and B is normal. Combined with the situation that when the A-phase control switch and the B-phase control switch are closed respectively, any second interface voltage under phase C is inconsistent with the first interface voltage of phase C, it can be concluded that the wiring between each converter and the convergence switching control device in phases A, B and C is normal, that is, the wiring between each converter and the convergence switching control device is normal.

[0067] In addition, in the scenario of three-phase three-wire power supply, each interface voltage is expressed as line voltage, which means that the measurement of each interface voltage needs to be carried out when two phases are energized. Therefore, when two phase control switches are in a closed state and the first interface voltage is consistent with all second interface voltages of the same phase as the first interface voltage, it is impossible to determine whether the two currently closed phases are reversed, and a new phase control switch, namely the target phase control switch, needs to be closed, and the voltage difference between other phases is measured by turning on the new phase line to obtain other interface voltages; and even after closing the new phase control switch, it is still impossible to rule out whether the phase corresponding to the marked phase control switch is reversed, so one of the marked phase control switches in a closed state can be disconnected, and the target phase control switch can be closed at the same time, so that the new interface voltage can be measured, and then the wiring conditions of each converter in other phases can be detected again. Specifically, after closing the A-phase control switch and the B-phase control switch, the interface voltage of the A-phase interface (or the B-phase interface), that is, the line voltage Uab, can be measured. At this time, the first interface voltage is consistent with all the second interface voltages of the same phase, and it can be determined that the wiring of each interface corresponding to the C-phase is normal, but it is impossible to determine whether the interfaces corresponding to the A-phase and the B-phase are reversed. Therefore, the marked A-phase control switch can be disconnected, the B-phase control switch is kept closed, and the target phase control switch, that is, the C-phase control switch, is closed at the same time. At this time, the interface voltage of the B-phase interface (or the C-phase interface), that is, the line voltage Ubc, can be measured. If the first interface voltage is still consistent with all the second interface voltages of the same phase, then it can be determined that the wiring conditions of each interface are normal. If any second interface voltage is inconsistent with the first interface voltage of the same phase, it can be considered that the converter corresponding to the second interface voltage that is inconsistent with the first interface voltage of the same phase has opposite wiring in the A-phase and the B-phase.

[0068] The following is a specific example to illustrate the wiring detection method of the converter system provided by the embodiment of the present invention.

[0069] Taking the AC grid using three-phase power to supply power to the converging switching control device as an example, refer to Fig.11 , Fig.11 FIG. 1 is a schematic diagram of the overall process of the grid-connected startup wiring detection of the converter system provided by the embodiment of the present invention. Fig.11As shown, in step S1001, when it is detected that the AC power grid supplies power to the bus switching control device, the converter system can be controlled to start up in grid connection, so that the converter can obtain and store electrical energy from the AC power grid. Next, in step S1002, one or two phase control switches are controlled to be closed; in step S1003, the first interface voltages of all interfaces in the first interface group of the convergence switching control device and the second interface voltages of all interfaces in the second interface group of each converter are collected; then, in step S1004, for each second interface voltage, the second interface voltage is compared with the first interface voltage of the same phase; if any second interface voltage is inconsistent with the first interface voltage of the same phase, step S1005 can be executed, in which it can be determined that the converter system wiring is abnormal, and the wiring abnormality can be located in the converter corresponding to the second interface voltage; if all second interface voltages are consistent with the corresponding first interface voltage of the same phase, step S1006 can be executed, in which, after a first delay, all phase control switches are closed, wherein the first delay can provide a time for the converter system power supply to stabilize, thereby ensuring that the converter system is in a stable state and reducing the accuracy of subsequent data measurement affected by voltage fluctuations, and in step S1006, In step S1007, the first interface voltages of all interfaces in the first interface group of the convergence switching control device and the second interface voltages of all interfaces in the second interface group of each converter are recollected, and the first phase sequence of the convergence switching control device in the first interface group and the second phase sequence of all converters in the second interface group are measured simultaneously; in step S1008, the first interface voltage is compared with the second interface voltage of the same phase, and each second phase sequence is compared with the first phase sequence as a reference; if all first interface voltages are consistent with all second interface voltages of the same phase, and the first phase sequence matches all second phase sequences, step S1009 can be executed to determine that all converters in the converter system are connected normally; if any second interface voltage is inconsistent with the first interface voltage of the same phase, or any second phase sequence does not match the first phase sequence, step S1010 can be executed to determine that the converter system is abnormally wired, and the wiring abnormality can be located to the converter corresponding to the second interface voltage inconsistent with the first interface voltage of the same phase or the converter corresponding to the second phase sequence that does not match the first phase sequence.

[0070] Second, refer to Fig.12 The embodiment of the present invention provides an operation control device 1200, including a memory 1220, a processor 1210, and a computer program stored in the memory 1220 and executable on the processor 1210. The processor 1210 executes the program to implement the wiring detection method of the first embodiment or the wiring detection method of the second embodiment, for example, to execute Figure 4 In the method steps S110 to S130, Figure 5Steps S210 to S230 of the method, or performing Figure 6 In step S310 of the method, or executing Figure 7 or performing steps S410 to S430 of the method Figure 8 In the method steps S510, S520 and S530, or executing Fig. 9 or performing steps S610 to S640 of the method Fig.10 Method step S710 in .

[0071] According to the operation control device provided by the embodiment of the present invention, since the interface voltages connected using the same phase line should be consistent, when the AC power grid supplies power to the convergence switching control device, by closing only some phase control switches, the interfaces corresponding to some phase lines are energized, and the interfaces corresponding to other phase lines are not energized, thereby causing differences in the interface voltages of some interfaces. Then, the interface voltages of all interfaces are obtained, and the interface voltages of the same phase are compared, so that the wiring conditions of each converter can be quickly, accurately and comprehensively determined.

[0072] In a third aspect, an embodiment of the present invention provides a wiring detection device, comprising an operation control device as described in the embodiment of the second aspect above.

[0073] According to the wiring detection device provided in the embodiment of the present invention, since the interface voltages of the connections using the same phase line should be consistent, when the AC power grid supplies power to the convergence switching control device, by closing only some phase control switches, the interfaces corresponding to some phase lines are energized, and the interfaces corresponding to other phase lines are not energized, thereby causing differences in the interface voltages of some interfaces. Then, the interface voltages of all interfaces are obtained, and the interface voltages of the same phase are compared, so that the wiring conditions of each converter can be quickly, accurately and comprehensively determined.

[0074] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the wiring detection method of the first aspect embodiment or the wiring detection method of the second aspect embodiment, for example, to execute Figure 4 In the method steps S110 to S130, Figure 5 Steps S210 to S230 of the method, or performing Figure 6 In step S310 of the method, or executing Figure 7 or performing steps S410 to S430 of the method Figure 8 In the method steps S510, S520 and S530, or executing Fig. 9 or performing steps S610 to S640 of the method Fig.10Method step S710 in .

[0075] According to the computer-readable storage medium provided in an embodiment of the present invention, since the interface voltages connected using the same phase line should be consistent, when the AC power grid supplies power to the convergence switching control device, by closing only some phase control switches, the interfaces corresponding to some phase lines are energized, and the interfaces corresponding to other phase lines are not energized, thereby causing differences in the interface voltages of some interfaces. By obtaining the interface voltages of all interfaces and comparing the interface voltages of the same phase, the wiring conditions of each converter can be quickly, accurately and comprehensively determined.

[0076] It will be appreciated by those skilled in the art that all or some of the steps and systems in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application-specific integrated circuit. The integrated physical components may be stored in a computer-readable storage medium if implemented in the form of software functional units and sold or used as independent products. Based on such an understanding, the technical solution of the present invention may be essentially or partly or all or partly in the form of a software product that contributes to the prior art, and the computer software product may be stored in a storage medium, including several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of various embodiments of the present invention. As a term well known to those skilled in the art, computer storage media include volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information such as computer-readable instructions, data structures, program modules, or other data. Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk DVD or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those skilled in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0077] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A method for detecting wiring of a converter system, wherein the converter system comprises a phase line, a current-converging switching control device and at least one converter, wherein the current-converging switching control device comprises a first interface group, and a plurality of phase control switches respectively corresponding to each interface in the first interface group, wherein the converter comprises a plurality of second interface groups correspondingly connected to the first interface group through the phase line, wherein the phase control switch is used to control the conduction relationship between the converter and the AC power grid, wherein: The wiring detection method comprises: When the AC power grid supplies power to the convergence switching control device, a first number of the phase control switches are controlled to be closed, wherein the first number is less than the number of all interfaces in the first interface group; Acquire first interface voltages of all interfaces in the first interface group, and second interface voltages of all interfaces in the second interface group; The connection detection result of each of the converters is determined according to the first interface voltage and all the second interface voltages which are in phase with the first interface voltage.

2. The wiring detection method according to claim 1, characterized in that: The determining, according to the first interface voltage and all the second interface voltages in phase with the first interface voltage, a wiring detection result of each of the converters comprises: When the first interface voltage is consistent with all the second interface voltages in phase with the first interface voltage, controlling all the phase control switches to be closed; Reacquiring first interface voltages of all interfaces in the first interface group and second interface voltages of all interfaces in the second interface group; The connection detection result of each of the converters is determined again according to the first interface voltage and all the second interface voltages that are in phase with the first interface voltage.

3. The wiring detection method according to claim 1 or 2, characterized in that: The determining, according to the first interface voltage and all the second interface voltages in phase with the first interface voltage, a wiring detection result of each of the converters comprises: When the second interface voltage is inconsistent with the first interface voltage which is in phase with the second interface voltage, it is determined that the connection of the converter corresponding to the second interface voltage is abnormal.

4. The wiring detection method according to claim 1, characterized in that: The determining, according to the first interface voltage and all the second interface voltages in phase with the first interface voltage, a wiring detection result of each of the converters comprises: When the first interface voltage is consistent with all the second interface voltages in phase with the first interface voltage, controlling all the phase control switches to be closed; Acquire a first phase sequence of the convergence switching control device in the first interface group, and a second phase sequence of all converters in the second interface group; According to the first phase sequence and all the second phase sequences, a connection detection result of each of the converters is determined.

5. The wiring detection method according to claim 4, characterized in that: The step of determining the connection detection result of each of the converters according to the first phase sequence and all of the second phase sequences includes: When the second phase sequence does not match the first phase sequence, determining that the current transformer connection corresponding to the second phase sequence is abnormal; or, When the second phase sequence matches the first phase sequence, it is determined that the connection of the converter corresponding to the second phase sequence is normal.

6. The wiring detection method according to claim 1, characterized in that: In a case where there are at least three phase control switches and the first number is one, determining the wiring detection result of each of the converters according to the first interface voltage and all the second interface voltages in phase with the first interface voltage includes: When the first interface voltage is consistent with all the second interface voltages in phase with the first interface voltage, adding a mark to the currently closed phase control switch; Selecting one of the phase-controlled switches to which no mark is added as a target phase-controlled switch, and controlling the target phase-controlled switch to be closed; Reacquiring first interface voltages of all interfaces in the first interface group and second interface voltages of all interfaces in the second interface group; The connection detection result of each of the converters is determined again according to the first interface voltage and all the second interface voltages that are in phase with the first interface voltage.

7. The wiring detection method according to claim 6, characterized in that: The controlling the target phase control switch to close includes: When there are a plurality of the phase control switches with added marks, at least one of the phase control switches with added marks is controlled to be opened, and the target phase control switch is controlled to be closed.

8. An operation control device, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the wiring detection method of the converter system according to any one of claims 1 to 7.

9. A wiring detection device, applied to a converter system, characterized in that: Comprising the operation control device as claimed in claim 8.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the wiring detection method for a converter system according to any one of claims 1 to 7.

Images