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

Abstract

The invention discloses a current transformer system wiring detection method, device, equipment and medium, the current transformer system comprises a confluence switching control device and at least one current transformer, the confluence switching control device comprises a first interface group, and the current transformer comprises a plurality of second interface groups correspondingly connected with the first interface through phase lines. The wiring detection method comprises the following steps: controlling all converters to supply power to the confluence switching control device; acquiring a first initial voltage of the first interface group and second initial voltages of all second interface groups; determining a disturbance phase, and applying voltage disturbance to the interfaces corresponding to the disturbance phase in all the second interface groups; acquiring a first disturbance voltage of the first interface group and second disturbance voltages of all the second interface groups; and determining a wiring detection result of each converter according to the first initial voltage, the second initial voltage, the first disturbance voltage and the second disturbance 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 convergence 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 convergence switching control device. In addition, when the converter system needs to be black-started with load, each interface in each converter is connected to the load through the convergence switching control device, and it is impossible to control the on-off relationship of each phase line between the converter and the load, and it is also impossible to independently control a converter for differentiated operation, so it is difficult to detect the wiring situation between the converter and the convergence switching control device. If it is not discovered and resolved in time before the system starts, it will make the system unstable 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 status of each interface 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 the converter includes a plurality of second interface groups correspondingly connected to the first interface group through the phase line, wherein the wiring detection method includes: Controlling all the converters to supply power to the convergence switching control device; Acquire a first initial voltage of all interfaces in the first interface group, and a second initial voltage of all interfaces in the second interface group; Determine a disturbance phase, and apply voltage disturbance to all interfaces in the second interface group corresponding to the disturbance phase; Acquire a first disturbance voltage after voltage disturbance is applied to all interfaces in the first interface group, and a second disturbance voltage after voltage disturbance is applied to all interfaces in the second interface group; A wiring detection result of each of the converters is determined according to the first initial voltage, the second initial voltage, the first disturbance voltage, and the second disturbance voltage.

[0005] The wiring detection method of the converter system provided in accordance with the embodiment of the present invention has at least the following beneficial effects: when the converter is powered, a voltage disturbance is introduced to the interface corresponding to the disturbance in the second interface group used for power supply of the converter. Since the interface voltages connected to the same phase line should be consistent, the introduction of the voltage disturbance can create a measurable change. Then, the voltages of each interface before and after the voltage disturbance is introduced are obtained, and the propagation of the voltage disturbance between the interfaces is observed. The wiring conditions of each converter are judged by detecting whether the interface voltages of each interface change according to the expected law of the voltage disturbance. The wiring detection method provided in the embodiment of the present invention allows detection when all converters are started at the same time, which meets the requirements of the system black start with load. The wiring conditions of each converter can be judged quickly, accurately and comprehensively, and converters with incorrect wiring can be quickly located, thereby improving detection efficiency and practicality.

[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 initial voltage, the second initial voltage, the first disturbance voltage, and the second disturbance voltage includes: For each interface in the first interface group, calculating the first initial voltage and the first disturbance voltage to obtain each first voltage difference; For each interface in all the second interface groups, calculating the second initial voltage and the second disturbance voltage to obtain each second voltage difference; A connection detection result of each of the converters is determined according to the first voltage difference and the second voltage difference.

[0007] In the wiring detection method provided in the embodiment of the present invention, the phases other than the disturbance phase in the power supply phases between the converter and the convergence switching control device are non-disturbance phases; and determining the wiring detection results of each converter according to the first voltage difference and the second voltage difference includes: When the first voltage difference corresponding to the disturbed phase and all the second voltage differences corresponding to the disturbed phase are greater than the first preset voltage difference, and the first voltage difference corresponding to the non-disturbed phase and all the second voltage differences corresponding to the non-disturbed phase are less than the second preset voltage difference, it is determined that the wiring of each of the converters is normal.

[0008] In the wiring detection method provided in the embodiment of the present invention, the wiring detection method further includes: Calculate the difference between the first initial voltage and all the second initial voltages in phase with the first initial voltage in sequence, to obtain a plurality of initial voltage differences; performing pairwise difference calculations on the first disturbance voltage and all the second disturbance voltages in phase with the first disturbance voltage in sequence to obtain a plurality of disturbance voltage differences; A connection detection result of each of the converters is determined according to the first voltage difference, the second voltage difference, the initial voltage difference and the disturbance voltage difference.

[0009] In the wiring detection method provided in an embodiment of the present invention, the phases other than the disturbance phase in the power supply phases between the converter and the convergence switching control device are non-disturbance phases; and determining the wiring detection results of each converter according to the first voltage difference, the second voltage difference, the initial voltage difference and the disturbance voltage difference includes: When the first voltage difference, the second voltage difference, the initial voltage difference and the disturbance voltage difference all meet a first connection condition, determining that all the converter connections are normal; The first wiring condition includes all of the following situations: The first voltage difference corresponding to the disturbance phase and all second voltage differences corresponding to the disturbance phase are greater than a first preset voltage difference; The first voltage difference corresponding to the non-perturbation phase and all the second voltage differences corresponding to the non-perturbation phase are smaller than a second preset voltage difference; All of the initial voltage differences and all of the disturbance voltage differences are smaller than a third preset voltage difference.

[0010] In the wiring detection method provided in the embodiment of the present invention, the wiring detection method further includes: When the first voltage difference corresponding to the disturbance phase is less than or equal to a first preset voltage difference, it is determined that any of the converters and the merging switching control device is incorrectly connected in the disturbance phase; or, When the second voltage difference corresponding to the disturbance phase is less than or equal to the first preset voltage difference, it is determined that the current transformer corresponding to the second voltage difference and the current convergence switching control device are connected incorrectly in the disturbance phase; or, When the first voltage difference corresponding to the non-disturbance phase is greater than or equal to a second preset voltage difference, it is determined that any of the converters and the merging switching control device is incorrectly connected in the non-disturbance phase; or, When the second voltage difference corresponding to the non-disturbance phase is greater than or equal to a second preset voltage difference, it is determined that the current transformer and the busbar switching control device corresponding to the second voltage difference are incorrectly connected in the non-disturbance phase.

[0011] In the wiring detection method provided in the embodiment of the present invention, the wiring detection method further includes: When the initial voltage difference is greater than or equal to a third preset voltage difference, determining that the current transformer corresponding to the initial voltage difference and the current convergence switching control device are connected incorrectly in the phase corresponding to the initial voltage difference; Alternatively, when the disturbance voltage difference is greater than or equal to a third preset voltage difference, it is determined that the current transformer corresponding to the disturbance voltage difference and the current confluence switching control device are connected incorrectly in the phase corresponding to the disturbance voltage difference.

[0012] In the wiring detection method provided in the embodiment of the present invention, after controlling all the converters to supply power to the convergence switching control device through the second interface, the wiring detection method further includes: 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; It is determined that the inverter connection corresponding to the second phase sequence that does not match the first phase sequence is abnormal.

[0013] In the wiring detection method provided in the embodiment of the present invention, in the process of controlling all the converters to supply power to the convergence switching control device, the power supply voltage synchronously output by all the converters to each interface in the first interface group is slowly increased to the target rated voltage; the wiring detection method further includes: During the period when all the converters synchronously output the supply voltage to each interface in the first interface group and the supply voltage is gradually increased to the target rated voltage, obtaining the interface current of each interface in all the second interface groups; When the interface current reaches an overcurrent threshold, it is determined that there is a wiring error between any of the converters and the current convergence switching control device.

[0014] 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.

[0015] The operation control device provided according to the embodiment of the present invention has at least the following beneficial effects: when the converter is powered, a voltage disturbance is introduced to the interface corresponding to the disturbance in the second interface group used for power supply of the converter. Since the interface voltages connected to the same phase line should be consistent, the introduction of the voltage disturbance can create a measurable change. Then, the voltages of each interface before and after the voltage disturbance is introduced are obtained, and the propagation of the voltage disturbance between the interfaces is observed. The wiring conditions of each converter are judged by detecting whether the interface voltages of each interface change according to the expected law of the voltage disturbance. The wiring detection method provided by the embodiment of the present invention allows detection when all converters are started at the same time, which meets the requirements of the system black start with load. The wiring conditions of each converter can be judged quickly, accurately and comprehensively, and converters with incorrect wiring can be quickly located, thereby improving detection efficiency and practicality.

[0016] 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.

[0017] The wiring detection device provided according to the embodiment of the present invention has at least the following beneficial effects: when the converter is powered, a voltage disturbance is introduced to the interface corresponding to the disturbance in the second interface group used for power supply of the converter. Since the interface voltages of the same phase line should be consistent, the introduction of the voltage disturbance can create a measurable change. Then, the voltages of each interface before and after the voltage disturbance is introduced are obtained, and the propagation of the voltage disturbance between the interfaces is observed. The wiring conditions of each converter are judged by detecting whether the interface voltages of each interface change according to the expected law of the voltage disturbance. The wiring detection method provided by the embodiment of the present invention allows detection when all converters are started at the same time, which meets the requirements of the system black start with load. The wiring conditions of each converter can be judged quickly, accurately and comprehensively, and converters with incorrect wiring can be quickly located, thereby improving detection efficiency and practicality.

[0018] 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.

[0019] The computer-readable storage medium provided in accordance with the embodiment of the present invention has at least the following beneficial effects: when the converter is powered, a voltage disturbance is introduced to the interface corresponding to the disturbance in the second interface group used for power supply of the converter. Since the interface voltages connected to the same phase line should be consistent, the introduction of the voltage disturbance can create a measurable change. Then, the voltages of each interface before and after the voltage disturbance is introduced are obtained, and the propagation of the voltage disturbance between the interfaces is observed. The wiring conditions of each converter are determined by detecting whether the interface voltages of each interface change according to the expected law of the voltage disturbance. The wiring detection method provided in the embodiment of the present invention allows detection when all converters are started at the same time, which meets the requirements of the system black start with load. The wiring conditions of each converter can be determined quickly, accurately and comprehensively, and converters with incorrect wiring can be quickly located, thereby improving detection efficiency and practicality.

[0020] 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

[0021] 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.

[0022] 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 flow chart of a wiring detection method for a converter system provided by an embodiment of the present invention; Figure 3 yes Figure 2 The specific flow chart of step 150 is shown; Figure 4 yes Figure 3 The specific flow chart of step 230 is shown; Figure 5 is a schematic diagram of a specific flow chart of a wiring detection method of a converter system according to another embodiment of the present invention; Figure 6 yes Figure 5 The specific flow chart of step S430 is shown; Figure 7 is a schematic diagram of a specific flow chart of a wiring detection method of a converter system according to another embodiment of the present invention; Figure 8is a schematic diagram of a specific flow chart of a wiring detection method of a converter system according to another embodiment of the present invention; Fig. 9 yes Figure 2 The specific flow chart after step 110 is shown; Fig.10 yes Figure 2 The specific flow chart of step 110 is shown; Fig.11 It is a schematic diagram of the overall process of 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

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] In many power systems that can be connected to or off-grid, ensuring accurate wiring detection is of great importance to maintaining the stable operation of the system. At present, the converter system adopts a two-phase or three-phase power supply mode, which means that there are a large number of phase lines, and the phase line interfaces of the converter and the convergence switching control device are similar in appearance. At the same time, the converter system usually relies on manual installation, which leads to phase line wiring errors between the converter and the convergence switching control device. In particular, in the scenario where the converter system needs to be black-started with load, the interfaces in each converter are connected to the load through the convergence switching control device. In this scenario, it is impossible to freely control the on and off of each phase line between the converter and the load, and it is impossible to independently control a converter to achieve differentiated operation. Such restrictions greatly hinder the detection of the wiring conditions between the converter and the convergence switching control device. If the wiring error problem cannot be discovered and solved in time before the system is started, the system operation will be unstable and even the converter will be damaged, which will have a serious impact on the safety and reliability of the system.

[0028] Based on this, an embodiment of the present invention proposes a wiring detection method, device, equipment and medium for a converter system. When the converter is powered, a voltage disturbance is introduced to the interface corresponding to the disturbance in the second interface group used for power supply of the converter. Since the interface voltages of the same phase line should be consistent, the introduction of the voltage disturbance can create a measurable change. Then, the voltages of each interface before and after the voltage disturbance is introduced are obtained, and the propagation of the voltage disturbance between the interfaces is observed. The wiring conditions of each converter are judged by detecting whether the interface voltages of each interface change according to the expected law of the voltage disturbance. The wiring detection method provided by the embodiment of the present invention allows detection when all converters are started at the same time, which meets the requirements of the system black start with load. The wiring conditions of each converter can be quickly, accurately and comprehensively judged, and converters with incorrect wiring can be quickly located, thereby improving detection efficiency and practicality.

[0029] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0030] Reference Figure 1 , Figure 1 is a schematic diagram of the structure of the converter system provided by an embodiment of the present invention. It can be understood that, Figure 11 is a schematic diagram of the structure of the converter system provided by the embodiment of the present invention. It can be understood that the converter system includes a bus switching control device 100 , a local system controller (LC), and at least one converter 200 . The confluence 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 grid to obtain power from the AC grid. The number of interfaces in the grid interface group 300 is determined based on the power supply method adopted by the AC grid. For example, if the AC grid adopts a three-phase four-wire power supply method, the grid interface group 300 has four interfaces correspondingly, which respectively correspond to the A phase line, the B phase line, the C phase line and the ground line of the AC grid; and the first interface group 110 is used to connect to the converter 200. The first interface group 110 includes multiple interfaces corresponding to the power supply of the AC grid. When the AC grid adopts three-phase power supply, the first interface group 110 can include a first A interface corresponding to the A phase, a first B interface corresponding to the B phase and a first C interface corresponding to the C phase; in addition, the load interface group 400 is used to simultaneously connect the first interface group 110 and the grid interface group 300, so as to obtain the power provided by the AC grid and / or the converter 200.

[0031] 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.

[0032] It should be noted that the grid interface group 300 can be connected to the corresponding first interface group 110 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. When the grid control switch 310 is disconnected, the AC power grid cannot supply power to the convergence switching control device 100; in addition, when the AC power grid stops running (such as a power outage), even if the grid control switch 310 is closed, the AC power grid cannot supply power to the convergence switching control device 100.

[0033] It is worth noting that in the case of a black start of the converter system with load, the bus switching control device 100 may not include the grid interface group 300, that is, the converter system and the load are in a pure off-grid state, and the load only relies on the converter system for power supply.

[0034] 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.

[0035] When there are multiple converters 200 in the converter system, 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, wherein the converter 200 may refer to a power conversion system (PCS), which can be referred to as 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.

[0036] The local system controller is used to control and manage the entire converter system. The local system controller is connected to the bus switching control device 100 and all converters 200 respectively. Specifically, the local system controller can control the closing and opening of each grid control switch 310 in the bus switching control device 100, and can also perform voltage sampling on each first interface group 110 of the bus switching control device 100, and can also perform voltage sampling on each second interface group 210 of all converters 200. It can also control the operation of each converter 200, and control the output voltage of each converter 200 at the second interface group 210.

[0037] It should be noted that the local system controller may be undertaken by any converter 200 in the converter system, or by the convergence switching control device 100, or by an independent system controller.

[0038] It can be understood by those skilled in the art that Figure 1 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.

[0039] Reference Figure 2 , Figure 2 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 The inverter system shown in the figure, the wiring detection method includes but is not limited to the following steps: Step S110: controlling all converters to supply power to the bus switching control device; Step S120: acquiring a first initial voltage of all interfaces in the first interface group, and a second initial voltage of all interfaces in the second interface group; Step S130: determining a disturbance phase, and applying voltage disturbance to all interfaces in the second interface group corresponding to the disturbance phase; Step S140: acquiring a first disturbance voltage of all interfaces in the first interface group after voltage disturbance is applied, and a second disturbance voltage of all interfaces in the second interface group after voltage disturbance is applied; Step S150: determining the wiring detection result of each converter according to the first initial voltage, the second initial voltage, the first disturbance voltage and the second disturbance voltage.

[0040] It can be understood that when it is detected that the grid interface group of the convergence switching control device is in an unpowered state, or the grid control switch is disconnected, or the convergence switching control device is not connected to the AC power grid, it means that the current AC power grid does not supply power to the convergence switching control device. At this time, when the load interface group needs to obtain electrical energy, the converter can be controlled to start with load in a black start, that is, all converters are controlled to output voltage to each interface in the first interface group of the convergence switching control device, so as to provide power to the load through the convergence switching control device.

[0041] Since the interface voltages connected on the same phase line should be consistent, the voltage disturbance introduced to a specific interface in the second interface group is used to create a quantifiable voltage change, and by observing whether the interface voltage of each interface follows the expected change law of the voltage disturbance, the wiring status of each converter can be quickly and accurately detected in a complex environment where the system is in a loaded black start state, and the ability to quickly locate the converter with incorrect wiring is also provided, which significantly improves the efficiency and practicality of the detection. In addition, the wiring detection method proposed in the embodiment of the present invention can also be adapted to scenarios where a single converter cannot be independently controlled for differentiated operation.

[0042] Specifically, before applying voltage disturbance to the second interface group, voltage sampling is first performed on all interfaces in the first interface group and all interfaces in the second interface groups to obtain a first initial voltage of the first interface group and a second initial voltage of multiple second interface groups. The first initial voltage and the second initial voltage can reflect the voltage state of each interface in the converter system when there is no external interference, and can provide a reference for the comparison of subsequent voltage changes. Then, one of the power supply phases from the converter to the confluence switching control device is arbitrarily selected as the disturbance phase, and a voltage disturbance is introduced to the interface corresponding to the disturbance phase, so that the voltage output by the interface corresponding to the disturbance phase in the second interface group to the interface corresponding to the disturbance phase in the first interface group changes and is no longer equal to the voltage output by the interface corresponding to the non-disturbance phase.

[0043] It is worth noting that the power supply phase other than the disturbance phase in the converter to the convergence switching control device is the non-disturbance phase. At the same time, in the absence of external interference, when the converter supplies power to the convergence switching control device, the converter outputs voltages of equal amplitude to each interface in the first interface group.

[0044] After applying voltage disturbance to the interface of the second interface group, voltage sampling is performed again on all interfaces in the first interface group and all interfaces in all second interface groups to obtain a first disturbance voltage of the first interface group and second disturbance voltages of multiple second interface groups. The first disturbance voltage and the second disturbance voltage represent the voltage states of each interface after the voltage disturbance is applied to the interface corresponding to the disturbance phase of the second interface group in all converters. Therefore, the first disturbance voltage and the second disturbance voltage after applying the voltage disturbance are respectively compared with the first initial voltage and the second initial voltage before applying the voltage disturbance, and the changes of each interface after applying the voltage disturbance are analyzed to determine whether the voltage of each interface meets the expected change law of the voltage disturbance, and then it can be determined whether the wiring of each converter is normal.

[0045] Among them, the expected change law of voltage disturbance is that when the wiring of each interface is normal, after the voltage disturbance is applied to the interface corresponding to the disturbance, the interface voltage corresponding to the interface and the interface connected to the interface will change, and the change amplitude matches the disturbance amplitude, while the interface voltage of other non-disturbance corresponding interfaces should not change.

[0046] Specifically, taking phase A as the disturbance phase, a voltage disturbance is applied to the second A interface corresponding to phase A in the second interface group of all converters, that is, the voltage output by all second A interfaces is controlled to be reduced by 10V. At this time, when each interface is normal, the first disturbance voltage of the first A interface corresponding to phase A should be reduced by 10V compared with the first initial voltage. At the same time, the second disturbance voltage corresponding to each second A interface should also be reduced by 10V compared with the second initial voltage, while the interface voltages corresponding to the first B interface and the second B interface corresponding to phase B, and the first C interface and the second C interface corresponding to phase C are unchanged. If the interface voltage change of any interface among all interfaces of the first interface group and all interfaces of the second interface group does not meet the expected change law of the voltage disturbance, it can be determined that the converter wiring corresponding to the interface is abnormal.

[0047] It should be noted that applying voltage disturbance to the interface corresponding to the disturbance may be to control the voltage value output by the corresponding interface to decrease and other related operations. For example, the second A interface corresponding to the A phase may be controlled to reduce the disturbance variation (such as 10V) on the normal reference value currently output. In the scenario where the converter system is in off-grid parallel operation, the static droop curve may be adjusted by droop control or virtual synchronous control (Virtual Synchronous Generator, VSG) and other methods to reduce the voltage value output by the corresponding interface. For details, refer to the following formula (1): (1); in, Indicates the voltage value required to be output after the disturbance, Indicates the normal reference value of the current output. represents the droop coefficient, Indicates the current output power of the converter. Indicates the basic output power of the converter; droop coefficient The influence of power change on voltage can be determined by adjusting the droop coefficient , the slope of the static droop curve can be changed to adjust the output voltage value after the disturbance Specifically, when the droop coefficient When it increases, the influence of power change on voltage increases, and the voltage amplitude of disturbance also increases, so the droop coefficient can be adjusted , the amplitude of voltage disturbance can be flexibly controlled to adapt to different operating conditions and requirements.

[0048] It should be noted that after obtaining the first disturbance voltage and the second disturbance voltage, a new disturbance phase can be re-determined, and a new round of voltage disturbance can be applied to the interface corresponding to the new disturbance in the second interface group, and then the first disturbance voltage of the first interface group after the new round of voltage disturbance and the second disturbance voltage of the second interface group after the new round of voltage disturbance can be collected again; at the same time, the wiring conditions of each converter can be judged by combining the new first disturbance voltage, the new second disturbance voltage, and the original first initial voltage and the second initial voltage. By observing the changes in the voltage of each interface when voltage disturbance occurs in different phases, the wiring conditions of each interface in the second interface group can be judged more accurately.

[0049] Reference Figure 3 , a wiring detection method provided by an embodiment of the present invention, Figure 2 In the step S150 shown, the wiring detection method further includes steps S210 to S230: Step S210: For each interface in the first interface group, the first initial voltage and the first disturbance voltage are calculated to obtain each first voltage difference; Step S220: For each interface in all second interface groups, the second initial voltage and the second disturbance voltage are calculated to obtain each second voltage difference; Step S230: Determine the connection detection result of each converter according to the first voltage difference and the second voltage difference.

[0050] It can be understood that, for each interface in the first interface group of the convergence switching control device, the difference between the first initial voltage when no voltage disturbance is applied and the first disturbance voltage after the voltage disturbance is applied is calculated to obtain the first voltage difference of each interface in the first interface group. The first voltage difference can reflect the response of each interface in the first interface group under voltage disturbance. At the same time, the first voltage difference can be used as a reference data for subsequent judgment of the correctness of the wiring. Correspondingly, for each interface in the second interface group of each converter, the difference between the second initial voltage and the second disturbance voltage is also calculated to obtain the second voltage difference of each interface in the second interface group. The second voltage difference reveals the behavior of each converter interface under applied voltage disturbance. By comparing the first voltage difference with the second voltage difference, it can be determined whether the voltage disturbance behavior of each converter is consistent with the response of each interface of the first interface group under voltage disturbance, and then it can be determined whether the wiring between each converter and the convergence switching control device is consistent. Specifically, if the second voltage difference of all converters matches the first voltage difference of the convergence switching control device, that is, it conforms to the propagation law of voltage disturbance, then it can be considered that the wiring between each converter and the convergence switching control device is normal. Otherwise, it can be considered that there is abnormal converter wiring.

[0051] Reference Figure 4 , a wiring detection method provided by an embodiment of the present invention, Figure 3 In the step S230 shown, the wiring detection method further includes step S310: Step S310: When the first voltage difference corresponding to the disturbed phase and all the second voltage differences corresponding to the disturbed phase are greater than the first preset voltage difference, and the first voltage difference corresponding to the non-disturbed phase and all the second voltage differences corresponding to the non-disturbed phase are less than the second preset voltage difference, it is determined that the wiring of each converter is normal.

[0052] It can be understood that if the wiring of each converter is normal, then the voltage change amount of each interface of the first interface group in the phase where the voltage disturbance is introduced, and the voltage change amount of each interface of the same phase in all second interface groups are all greater than the first preset voltage difference, indicating that the voltage disturbance is reasonably propagated between each converter and the convergence switching control device, and the response of each converter and the convergence switching control device to the voltage disturbance is consistent. At the same time, the first voltage difference of other items where the voltage disturbance is not introduced and the second voltage difference of the same phase are both less than the second voltage difference threshold, which means that the voltage of each interface on the non-disturbance phase remains stable and is not disturbed by the voltage disturbance, thereby indirectly verifying that there is no abnormal situation of crossover or short circuit in the wiring. In summary, if the voltage difference (including the first voltage difference and the second voltage difference) on the disturbance phase is greater than the first preset voltage difference, and the voltage difference (including the first voltage difference and the second voltage difference) on the non-disturbance phase is less than the second preset voltage difference, it can be considered that the wiring between each converter and the convergence switching control device is in a normal state.

[0053] Reference Figure 5 The wiring detection method provided by an embodiment of the present invention further includes steps S410 to S430: Step S410: performing pairwise difference calculations on the first initial voltage and all second initial voltages in phase with the first initial voltage in sequence to obtain a plurality of initial voltage differences; Step S420: performing pairwise difference calculations on the first disturbance voltage and all second disturbance voltages in phase with the first disturbance voltage in sequence to obtain a plurality of disturbance voltage differences; Step S430: determining the connection detection result of each converter according to the first voltage difference, the second voltage difference, the initial voltage difference and the disturbance voltage difference.

[0054] It can be understood that by comparing the first initial voltage with all the second initial voltages of the same phase in pairs, calculating the difference, and obtaining multiple initial voltage differences, the initial voltage difference can reflect the consistency of the voltage between the first interface group and each converter in the second interface group of the confluence switching control device when no voltage disturbance is applied, and provide reference data for subsequent wiring detection. Similarly, by comparing the first disturbance voltage with all the second disturbance voltages of the same phase in pairs, calculating the difference, and obtaining multiple disturbance voltage differences, the disturbance voltage difference can reveal the consistency of the voltage response between the first interface group and each converter in the second interface group of the confluence switching control device after the voltage disturbance is applied. If the initial voltage difference is within the allowable error range, it can be shown that when no voltage disturbance is applied, the voltage consistency of each interface is good; if the disturbance voltage difference is also within the allowable error range, it can be shown that after the voltage disturbance is applied, the voltage response consistency of each interface is good. If there is a value beyond the allowable error range in the initial voltage difference or the disturbance voltage difference, it may mean that there is an abnormal wiring situation. Therefore, by combining the first voltage difference, the second voltage difference, the initial voltage difference and the disturbance voltage difference to make a comprehensive judgment from multiple dimensions, the wiring conditions of each converter can be judged more accurately, and potential wiring problems can be discovered in time. Moreover, by comprehensively judging the first voltage difference, the second voltage difference, the initial voltage difference and the disturbance voltage difference, interference caused by measurement errors, system fluctuations and other factors can be reduced. At the same time, the initial voltage difference and the disturbance voltage difference can be used to verify each other with the first voltage difference and the second voltage difference, reducing the possibility of misjudgment and improving the accuracy of detection. Moreover, since the initial voltage difference and the disturbance voltage difference are the degree of difference between different interfaces on the same phase at the same time, it is helpful to accurately locate the interface with incorrect wiring.

[0055] Reference Figure 6 , a wiring detection method provided by an embodiment of the present invention, Figure 5 In the step S430 shown, the wiring detection method further includes step S510: Step S510: When the first voltage difference, the second voltage difference, the initial voltage difference and the disturbance voltage difference all meet the first connection condition, it is determined that all converter connections are normal.

[0056] It can be understood that the first wiring condition is used to detect whether the voltage of each interface before and after the voltage disturbance is applied satisfies the expected change law of the voltage disturbance. Specifically, the first wiring condition includes all of the following situations: First, the first voltage difference corresponding to the disturbance and all the second voltage differences corresponding to the disturbance exceed the first preset voltage difference, which indicates that the voltage disturbance is effectively transmitted to the interface corresponding to the disturbance, and each interface has a correct response to the voltage disturbance; second, the first voltage difference corresponding to the non-disturbance and all the second voltage differences corresponding to the non-disturbance are less than the second preset voltage difference, which indicates whether the voltage change on the non-disturbance phase is kept within a small fluctuation range, which means that the interfaces of the non-disturbance phase are not subjected to undue interference and are consistent with the expected change law of the voltage disturbance; third, the voltage difference between any two interfaces before and after the voltage disturbance is applied (i.e., the initial voltage difference and the disturbance voltage difference) is less than the third preset voltage difference, which indicates that any two interfaces need to maintain voltage stability before and after the voltage disturbance is applied, and no significant voltage fluctuation or instability occurs. It is also the basic data for measuring whether the first voltage difference and the second voltage difference are accurate. When all of these conditions are met, it can be collectively determined that the wiring of all converters is normal.

[0057] It should be noted that the first preset pressure difference is greater than the second preset pressure difference, and the first preset pressure difference is also greater than the third preset pressure difference, and the first preset pressure difference should be less than the disturbance change of the applied voltage disturbance; and the second preset pressure difference can be equal to or different from the third preset pressure difference, and the second preset pressure difference and the third preset pressure difference are both used to indicate the error judgment range when the interface voltage is in a stable state.

[0058] Reference Figure 7 The wiring detection method provided by an embodiment of the present invention further includes step S610 or S620 or S630 or S640: Step S610: When the first voltage difference corresponding to the disturbance phase is less than or equal to the first preset voltage difference, it is determined that any converter and the bus switching control device are connected incorrectly in the disturbance phase; or, Step S620: When the second voltage difference corresponding to the disturbance phase is less than or equal to the first preset voltage difference, it is determined that the converter corresponding to the second voltage difference and the busbar switching control device are connected incorrectly in the disturbance phase; or, Step S630: When the first voltage difference corresponding to the non-disturbance phase is greater than or equal to the second preset voltage difference, it is determined that any converter and the bus switching control device are connected incorrectly in the non-disturbance phase; or, Step S640: When the second voltage difference corresponding to the non-disturbance phase is greater than or equal to the second preset voltage difference, it is determined that the current transformer corresponding to the second voltage difference and the busbar switching control device are incorrectly connected in the non-disturbance phase.

[0059] It is understandable that if the first voltage difference on the disturbance phase is less than or equal to the first preset voltage difference, it can be explained that the voltage change on the disturbance phase has not reached the expected level of change, which means that there is a wiring error in the interface corresponding to the disturbance, resulting in the inability to cause a significant change in the interface voltage. The first voltage difference on the disturbance phase can effectively eliminate the measurement error caused by the system fluctuation when the second interface group applies a voltage disturbance, and effectively improve the accuracy of the detection. And the second voltage difference on the disturbance phase can be used to quickly locate the root cause of the wiring abnormality to a specific converter. If the second voltage difference on the disturbance phase is less than or equal to the first preset voltage difference, it means that the converter has an interface wiring error on the disturbance phase, and is affected by the interface on the non-disturbance phase due to the wrong wiring to the interface on the non-disturbance phase in the first interface group, resulting in the second voltage difference failing to reach the expected level of change. If the first voltage difference on the non-disturbance phase is greater than or equal to the second preset pressure difference, this indicates that an unnecessary voltage change has occurred in the non-disturbance phase, which means that the interface corresponding to the disturbance phase of at least one converter is incorrectly connected to the interface corresponding to the non-disturbance phase in the bus switching control device; accordingly, if the second voltage difference on the non-disturbance phase is lower than or equal to the second preset pressure difference, this may indicate that the interface corresponding to the second voltage difference is incorrectly connected to the interface corresponding to the disturbance phase in the first interface group, which can achieve rapid positioning of the interface with abnormal wiring.

[0060] Reference Figure 8 , the wiring detection method provided by an embodiment of the present invention further includes step S710 or S720: Step S710: when the initial voltage difference is greater than or equal to the third preset voltage difference, determining that the current transformer corresponding to the initial voltage difference and the current-converging switching control device are connected incorrectly in the phase corresponding to the initial voltage difference; or, Step S720: When the disturbance voltage difference is greater than or equal to the third preset voltage difference, determining that the current transformer corresponding to the disturbance voltage difference and the current-converging switching control device have a phase connection error corresponding to the disturbance voltage difference.

[0061] It can be understood that the wiring detection is performed using the voltage difference between any two interfaces in the same phase, i.e., the initial voltage difference and the disturbance voltage difference. Since the voltage amplitudes output by each interface of each converter in the second interface group should be consistent when no voltage disturbance is applied, when each converter outputs voltage to each interface of the first interface group, the first initial voltage of each interface of the first interface group should be consistent with the second initial voltage of the same phase. If the initial voltage difference is greater than or equal to the third preset voltage difference, it means that when no voltage disturbance is applied, the voltage difference between the two interfaces corresponding to the initial voltage difference is large, that is, the first initial voltage is inconsistent with the second initial voltage of the same phase, so that it can be determined that the wiring between the converter and the grid-connected and disconnected port control device on this phase has phase line open circuit, short circuit, etc. Accordingly, since the voltages of the two interfaces connected to the same phase line should be consistent, after the voltage disturbance is applied, the voltages of the interfaces of each converter corresponding to the disturbed phase and the voltage of the interfaces of the busbar switching control device corresponding to the disturbed phase should also be consistent. If the disturbance voltage difference is greater than or equal to the third preset voltage difference, it can be explained that after the voltage disturbance is applied, the voltage disturbance applied to a certain converter cannot be transmitted to the interface corresponding to the disturbed phase in the busbar switching control device, or the voltage disturbance applied to a certain converter is erroneously transmitted to the interface corresponding to the non-disturbed phase in the busbar switching control device, thereby determining that there is a wiring error in the connection between the converter and the grid-connected and off-grid port control device on this phase.

[0062] Reference Fig. 9 , a wiring detection method provided by an embodiment of the present invention, Figure 2 After step S110 shown, the wiring detection method further includes steps S810 to S820: Step S810: obtaining a first phase sequence of the busbar switching control device in the first interface group, and a second phase sequence of all converters in the second interface group; Step S820: Determine that the inverter connection corresponding to the second phase sequence that does not match the first phase sequence is abnormal.

[0063] It can be understood that in the process of using voltage disturbance to perform wiring detection, only one power supply line is disturbed, so that the voltage of the interface on the disturbed phase changes, while the voltage of the interface on the non-disturbed phase does not change. It is easy for the interface on the non-disturbed phase to have a wiring error. Therefore, 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 measurement 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 AC power supply output by multiple converters in parallel to the convergence switching control device, and the second phase sequence of the second interface group represents the phase sequence of the power supply provided by each converter to the convergence switching control device. By comparing the first phase sequence with each second phase sequence, it is possible to accurately determine whether the wiring of each converter is normal, which helps to find possible wiring errors in the interfaces on the non-disturbance phases. Specifically, since there are multiple non-disturbance phases, even if the voltage on the interface of the non-disturbance phase can remain stable after the voltage disturbance is applied, it is impossible to determine whether there is a reverse connection between the multiple non-disturbance phases. For example, the first interface group includes a first A interface corresponding to the A phase, a first B interface corresponding to the B phase, and a first C interface corresponding to the C phase, and correspondingly, the second interface group includes a second A interface corresponding to the A phase, a second B interface corresponding to the B phase, and a first C interface corresponding to the C phase. At the second C interface of phase C, if the second A interface is incorrectly connected to the first B interface, and the second B interface is also incorrectly connected to the first A interface, at this time, a voltage disturbance is applied to the second C interface of phase C, and the voltage change on the first C interface conforms to the expected change law of the voltage disturbance. At the same time, the voltages of the first A phase interface, the second A interface, the first B phase interface and the second B interface do not change, and it is impossible to determine whether there is a reverse connection between multiple non-disturbance phases. 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.

[0064] Specifically, the first phase sequence can be used as the basis for phase sequence judgment, and the first phase sequence can be compared with each second phase sequence in turn. If the second phase sequence of all converters matches the first phase sequence, it can be considered that the wiring of all converters is correct; if the second phase sequence of a certain converter does not match the first phase sequence, it can be considered that there is an abnormality in the wiring of the converter.

[0065] Reference Fig.10 , a wiring detection method provided by an embodiment of the present invention, Figure 2 In the step S110 shown, the wiring detection method further includes steps S910 to S920: Step S910: while all converters synchronously output the supply voltage to each interface in the first interface group and gradually increase it to the target rated voltage, obtain the interface current of each interface in all second interface groups; Step S920: When the interface current reaches the overcurrent threshold, it is determined that there is a wiring error between any converter and the busbar switching control device.

[0066] It is understandable that when the converter is started off-grid, it needs to be started with load, and each converter starts output synchronously, and maintains a voltage with the same output amplitude and phase, and then synchronously increases the output power supply voltage to the target rated voltage to complete the converter startup process. During the period when the power supply voltage rises slowly to the target rated voltage, the interface current of each interface of the second interface group of each converter is monitored. If the interface voltage exceeds the overcurrent threshold, that is, an overcurrent fault occurs, it can be considered that there is a wiring error between at least one converter and the convergence switching control device. This is because if there is an abnormal wiring situation, such as the phase sequence of two converters is opposite, the current is unevenly distributed among the three phases, resulting in current imbalance, or the current is superimposed in some phases and abnormally increased, exceeding the overcurrent threshold of the converter. Therefore, if during the startup of the converter (i.e., the period when the power supply voltage slowly rises to the target rated voltage), if the interface current does not exceed the overcurrent threshold, it can be considered that the phase sequence of the connections between each converter and the bus switching control device is consistent, and then when the first voltage difference corresponding to the disturbed phase and all the second voltage differences corresponding to the disturbed phase are greater than the first preset voltage difference, and the first voltage difference corresponding to the non-disturbed phase and all the second voltage differences corresponding to the non-disturbed phase are less than the second preset voltage difference, it can be directly determined that the connections of each converter on the disturbed phase and the non-disturbed line phase are normal.

[0067] The following is a specific example to illustrate the wiring detection method of the converter system provided by the embodiment of the present invention.

[0068] 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, all converter systems are controlled to start synchronously to supply power to the convergence switching control device; in step S1002, while controlling all converters to slowly increase the output power supply voltage to the target rated voltage, it is determined whether the interface current of the second interface group exceeds the overcurrent threshold; if the interface current of any converter exceeds the overcurrent threshold, step S1003 can be executed to determine that the converter system wiring is abnormal and terminate the wiring detection process; if the interface current of all converters does not exceed the overcurrent threshold, step S1004 can be executed to collect the first initial voltages of all interfaces in the first interface group and the first initial voltages of all interfaces in all second interface groups. Then, step S1005 is executed, in which a disturbance phase is determined from the power supply phase of the converter, and a voltage disturbance is applied to the interfaces corresponding to the disturbance in all the second interface groups; then, step S1006 is executed, in which the first disturbance voltages of all interfaces in the first interface group and the second disturbance voltages of all interfaces in the second interface group are collected; after obtaining the first initial voltage, the second initial voltage, the first disturbance voltage and the second disturbance voltage, steps S1007 to S1010 are executed; in step S1007, for each interface in the first interface group, the first initial voltage and the second disturbance voltage are compared. In step S1008, for each interface in all second interface groups, the second initial voltage and the second disturbance voltage are calculated to obtain each second voltage difference; in step S1009, the first initial voltage is compared with all second initial voltages of the same phase in pairs to obtain multiple initial voltage differences; in step S1010, the first disturbance voltage is compared with all second disturbance voltages of the same phase in pairs to obtain multiple disturbance voltage differences; then, step S1011 is executed to determine whether the first voltage difference, the second voltage difference, the initial voltage difference and the disturbance voltage difference meet the first wiring condition, and the first wiring condition is The component includes a first voltage difference corresponding to the disturbed phase and all second voltage differences corresponding to the disturbed phase are greater than a first preset voltage difference, a first voltage difference corresponding to the non-disturbed phase and all second voltage differences corresponding to the non-disturbed phase are less than a second preset voltage difference, and all initial voltage differences and all disturbance voltage differences are less than a third preset voltage difference; if the first voltage difference, the second voltage difference, the initial voltage difference and the disturbance voltage difference meet the first wiring condition, step S1012 can be executed to determine that all converter connections are normal; if the first voltage difference, the second voltage difference, the initial voltage difference and the disturbance voltage difference do not meet the first wiring condition, step S1013 can be executed to determine that the converter system wiring is abnormal.

[0069] Second, refer to Fig.12The 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 as described above, for example, executing Figure 2 In the method steps S110 to S150, Figure 3 Steps S210 to S230 of the method, or performing Figure 4 In step S310 of the method, or executing Figure 5 or performing steps S410 to S430 of the method Figure 6 In step S510 of the method, or executing Figure 7 Step S610 or S620 or S630 or S640 of the method, or executing Figure 8 In step S710 or S720 of the method, or executing Fig. 9 Steps S810 to S820 of the method, or executing Fig.10 Method steps S910 to S920 in.

[0070] According to the operation control device provided by the embodiment of the present invention, when the converter is powered, a voltage disturbance is introduced to the interface corresponding to the disturbance in the second interface group used for power supply of the converter. Since the interface voltages connected on the same phase line should be consistent, the introduction of the voltage disturbance can create a measurable change. Then, the voltages of each interface before and after the voltage disturbance is introduced are obtained, and the propagation of the voltage disturbance between the interfaces is observed. By detecting whether the interface voltages of each interface change according to the expected law of the voltage disturbance, the wiring conditions of each converter are judged. The wiring detection method provided by the embodiment of the present invention allows detection when all converters are started at the same time, which meets the requirements of the system black start with load, and can quickly, accurately and comprehensively judge the wiring conditions of each converter, and can quickly locate converters with incorrect wiring, thereby improving detection efficiency and practicality.

[0071] In a third aspect, an embodiment of the present invention provides a wiring detection device, comprising an operation control device according to the embodiment of the second aspect above.

[0072] According to the wiring detection device provided by the embodiment of the present invention, when the converter is powered, a voltage disturbance is introduced to the interface corresponding to the disturbance in the second interface group used for power supply of the converter. Since the interface voltages of the same phase line should be consistent, the introduction of the voltage disturbance can create a measurable change. Then, the voltages of each interface before and after the voltage disturbance is introduced are obtained, and the propagation of the voltage disturbance between the interfaces is observed. By detecting whether the interface voltages of each interface change according to the expected law of the voltage disturbance, the wiring conditions of each converter are judged. The wiring detection method provided by the embodiment of the present invention allows detection when all converters are started at the same time, which meets the requirements of the system black start with load. The wiring conditions of each converter can be judged quickly, accurately and comprehensively, and converters with incorrect wiring can be quickly located, thereby improving detection efficiency and practicality.

[0073] 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, for example, to execute Figure 2 In the method steps S110 to S150, Figure 3 Steps S210 to S230 of the method, or performing Figure 4 In step S310 of the method, or executing Figure 5 or performing steps S410 to S430 of the method Figure 6 In step S510 of the method, or executing Figure 7 Step S610 or S620 or S630 or S640 of the method, or executing Figure 8 In step S710 or S720 of the method, or executing Fig. 9 Steps S810 to S820 of the method, or executing Fig.10 Method steps S910 to S920 in.

[0074] According to the computer-readable storage medium provided in an embodiment of the present invention, when the converter is powered, a voltage disturbance is introduced to the interface corresponding to the disturbance in the second interface group used for power supply of the converter. Since the interface voltages connected on the same phase line should be consistent, the introduction of the voltage disturbance can create a measurable change. Then, the voltages of each interface before and after the voltage disturbance is introduced are obtained, and the propagation of the voltage disturbance between the interfaces is observed. By detecting whether the interface voltages of each interface change according to the expected law of the voltage disturbance, the wiring conditions of each converter are judged. The wiring detection method provided in an embodiment of the present invention allows detection when all converters are started at the same time, which meets the requirements of the system black start with load, and can quickly, accurately and comprehensively judge the wiring conditions of each converter, and can quickly locate converters with incorrect wiring, thereby improving detection efficiency and practicality.

[0075] 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.

[0076] 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 busbar switching control device and at least one converter, wherein the busbar switching control device comprises a first interface group, and the converter comprises a plurality of second interface groups correspondingly connected to the first interface group through the phase line, wherein: The wiring detection method comprises: Controlling all the converters to supply power to the convergence switching control device; Acquire a first initial voltage of all interfaces in the first interface group, and a second initial voltage of all interfaces in the second interface group; Determine a disturbance phase, and apply voltage disturbance to all interfaces in the second interface group corresponding to the disturbance phase; Acquire a first disturbance voltage after voltage disturbance is applied to all interfaces in the first interface group, and a second disturbance voltage after voltage disturbance is applied to all interfaces in the second interface group; A wiring detection result of each of the converters is determined according to the first initial voltage, the second initial voltage, the first disturbance voltage, and the second disturbance voltage.

2. The wiring detection method according to claim 1, characterized in that: Determining the wiring detection result of each of the converters according to the first initial voltage, the second initial voltage, the first disturbance voltage, and the second disturbance voltage includes: For each interface in the first interface group, calculating the first initial voltage and the first disturbance voltage to obtain each first voltage difference; For each interface in all the second interface groups, calculating the second initial voltage and the second disturbance voltage to obtain each second voltage difference; A connection detection result of each of the converters is determined according to the first voltage difference and the second voltage difference.

3. The wiring detection method according to claim 2, characterized in that: Among the power supply phases between the converter and the convergence switching control device, the phases other than the disturbance phase are non-disturbance phases; and determining the wiring detection results of each converter according to the first voltage difference and the second voltage difference includes: When the first voltage difference corresponding to the disturbed phase and all the second voltage differences corresponding to the disturbed phase are greater than the first preset voltage difference, and the first voltage difference corresponding to the non-disturbed phase and all the second voltage differences corresponding to the non-disturbed phase are less than the second preset voltage difference, it is determined that the wiring of each of the converters is normal.

4. The wiring detection method according to claim 2, characterized in that: The wiring detection method further comprises: Calculate the difference between the first initial voltage and all the second initial voltages in phase with the first initial voltage in sequence, to obtain a plurality of initial voltage differences; performing pairwise difference calculations on the first disturbance voltage and all the second disturbance voltages in phase with the first disturbance voltage in sequence to obtain a plurality of disturbance voltage differences; A connection detection result of each of the converters is determined according to the first voltage difference, the second voltage difference, the initial voltage difference and the disturbance voltage difference.

5. The wiring detection method according to claim 4, characterized in that: Among the power supply phases between the converter and the merging switching control device, the phases other than the disturbance phase are non-disturbance phases; and determining the wiring detection results of each converter according to the first voltage difference, the second voltage difference, the initial voltage difference and the disturbance voltage difference, comprises: When the first voltage difference, the second voltage difference, the initial voltage difference and the disturbance voltage difference all meet a first connection condition, determining that all the converter connections are normal; The first wiring condition includes all of the following situations: The first voltage difference corresponding to the disturbance phase and all second voltage differences corresponding to the disturbance phase are greater than a first preset voltage difference; The first voltage difference corresponding to the non-perturbation phase and all the second voltage differences corresponding to the non-perturbation phase are smaller than a second preset voltage difference; All of the initial voltage differences and all of the disturbance voltage differences are smaller than a third preset voltage difference.

6. The wiring detection method according to claim 3 or 5, characterized in that: The wiring detection method further comprises: When the first voltage difference corresponding to the disturbance phase is less than or equal to a first preset voltage difference, it is determined that any of the converters and the merging switching control device is incorrectly connected in the disturbance phase; or, When the second voltage difference corresponding to the disturbance phase is less than or equal to the first preset voltage difference, it is determined that the current transformer corresponding to the second voltage difference and the current convergence switching control device are connected incorrectly in the disturbance phase; or, When the first voltage difference corresponding to the non-disturbance phase is greater than or equal to a second preset voltage difference, it is determined that any of the converters and the merging switching control device is incorrectly connected in the non-disturbance phase; or, When the second voltage difference corresponding to the non-disturbance phase is greater than or equal to a second preset voltage difference, it is determined that the current transformer and the busbar switching control device corresponding to the second voltage difference are incorrectly connected in the non-disturbance phase.

7. The wiring detection method according to claim 5, characterized in that: The wiring detection method further comprises: When the initial voltage difference is greater than or equal to a third preset voltage difference, determining that the current transformer corresponding to the initial voltage difference and the current convergence switching control device are connected incorrectly in the phase corresponding to the initial voltage difference; Alternatively, when the disturbance voltage difference is greater than or equal to a third preset voltage difference, it is determined that the current transformer corresponding to the disturbance voltage difference and the current confluence switching control device are connected incorrectly in the phase corresponding to the disturbance voltage difference.

8. The wiring detection method according to claim 1, characterized in that: After controlling all the converters to supply power to the convergence switching control device through the second interface, the wiring detection method further includes: 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; It is determined that the inverter connection corresponding to the second phase sequence that does not match the first phase sequence is abnormal.

9. The wiring detection method according to claim 1, characterized in that: In the process of controlling all the converters to supply power to the convergence switching control device, the power supply voltage synchronously output by all the converters to each interface in the first interface group is gradually increased to a target rated voltage; The wiring detection method further comprises: During the period when all the converters synchronously output the supply voltage to each interface in the first interface group and the supply voltage is gradually increased to the target rated voltage, obtaining the interface current of each interface in all the second interface groups; When the interface current reaches an overcurrent threshold, it is determined that there is a wiring error between any of the converters and the current convergence switching control device.

10. 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 9.

11. A wiring detection device, applied to a converter system, characterized in that: It comprises the operation control device as claimed in claim 10.

12. 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 9.

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