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 phase line, a plurality of converters and a confluence switching control device used for accessing an alternating current power grid, and the confluence switching control device comprises a first interface group used for being connected with a load. The converter comprises a second interface group which is correspondingly connected with a first interface group through a phase line, and the wiring detection method comprises the following steps: when an AC power grid does not supply power to a confluence switching control device, controlling a target converter to output different voltages to each interface in the first interface group, and controlling all converters except the target converter to stop running; obtaining interface reference voltages of all interfaces in the first interface group and second interface voltages of all interfaces in the second interface group; and determining a wiring detection result of each converter according to the interface reference voltage and all the second interface voltages with the same phase as the interface reference 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, and also uses multiple converters combined in parallel, 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 abnormal phase line wiring (such as reverse phase line connection, phase line detachment) 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 plurality of converters, and a bus switching control device for accessing an AC power grid, wherein the bus switching control device includes a first interface group for connecting to a load, and the converter includes a second interface group correspondingly connected to the first interface group through the phase line, and the wiring detection method includes: When the AC power grid does not supply power to the convergence switching control device, control the target converter to output different voltages to each interface in the first interface group, and control all converters except the target converter to stop running, wherein the target converter is any one of the multiple converters; Acquire interface reference 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 interface reference voltage and all the second interface voltages in phase with the interface reference 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: since the interface voltages in the same phase line connection should be consistent, when the AC power grid does not supply power to the bus switching control device and the converter is required to supply power, the target converter is controlled to output different voltages to each interface of the first interface group of the bus switching control device, thereby making the voltages of each corresponding interface different, and then 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.

[0006] 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 interface reference voltage and all the second interface voltages in phase with the interface reference voltage includes: When the second interface voltage is inconsistent with the interface reference voltage in phase with the second interface voltage, it is determined that the connection of the converter corresponding to the second interface voltage is abnormal.

[0007] In the wiring detection method provided in the embodiment of the present invention, when the second interface voltage is inconsistent with the interface reference voltage in phase with the second interface voltage, determining that the converter wiring corresponding to the second interface voltage is abnormal includes: Calculating the difference between the interface reference voltage and all the second interface voltages in phase with the interface reference voltage to obtain a plurality of voltage difference values ​​corresponding to the second interface voltages; When the voltage difference is greater than or equal to a preset voltage difference threshold, it is determined that the inverter connection corresponding to the voltage difference is abnormal.

[0008] 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 interface reference voltage and all the second interface voltages in phase with the interface reference voltage includes: When all the second interface voltages are consistent with the interface reference voltage that is in phase with the second interface voltage, it is determined that all the converter connections are normal.

[0009] In the wiring detection method provided in the embodiment of the present invention, when all the second interface voltages are consistent with the interface reference voltage in phase with the second interface voltage, determining that all the converter wirings are normal includes: Calculating the difference between the interface reference voltage and all the second interface voltages in phase with the interface reference voltage to obtain a plurality of voltage difference values ​​corresponding to the second interface voltages; When all the voltage difference values ​​are smaller than the preset voltage difference threshold, it is determined that all the converter connections are normal.

[0010] In the wiring detection method provided in the embodiment of the present invention, the controlling the target converter to output different voltages to each interface in the first interface group includes: Acquire an initial output voltage and a voltage superposition amount corresponding to each interface in the first interface group, wherein different voltage superposition amounts are different; Superimposing each of the voltage superposition amounts with the initial output voltage respectively to obtain a plurality of interface output voltages corresponding to each interface in the first interface group, wherein different interface output voltages are different; The target converter is controlled to output the corresponding interface output voltage to each interface in the first interface group.

[0011] In the wiring detection method provided in the embodiment of the present invention, the convergence switching control device further includes a plurality of phase control switches for controlling the conduction relationship between the converter and the AC power grid, and each of the phase control switches is correspondingly connected to each interface in the first interface group; When the AC power grid does not supply power to the bus switching control device, controlling the target converter to output different voltages to each interface in the first interface group, and controlling all converters except the target converter to stop running, includes: When the AC power grid does not supply power to the busbar switching control device, all the phase control switches are controlled to be disconnected; The target converter is controlled to output different voltages to the interfaces in the first interface group, and all converters except the target converter are controlled to stop running.

[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 in the same phase line connection should be consistent, when the AC power grid does not supply power to the convergence switching control device and the converter is required to supply power, the target converter is controlled to output different voltages to each interface of the first interface group of the convergence switching control device, thereby making the voltages of each corresponding interface different, and then 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 judged.

[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 in the same phase line wiring should be consistent, when the AC power grid does not supply power to the convergence switching control device and the converter is required to supply power, the target converter is controlled to output different voltages to each interface of the first interface group of the convergence switching control device, thereby making the voltages of each corresponding interface different, and then 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 judged.

[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 an embodiment of the present invention has at least the following beneficial effects: since the interface voltages in the same phase line connection should be consistent, when the AC power grid does not supply power to the convergence switching control device and the converter is required to supply power, the target converter is controlled to output different voltages to each interface of the first interface group of the convergence switching control device, thereby making the voltages of each corresponding interface different, and then 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.

[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 structural schematic diagram of a converter system provided by another embodiment of the present invention; Figure 3 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 4is a connection diagram of a converter system provided by an embodiment of the present invention in an off-grid parallel scenario; Figure 5 is a flow chart of a wiring detection method for a converter system provided by an embodiment of the present invention; Figure 6 yes Figure 5 The specific flow chart of step 130 is shown; Figure 7 yes Figure 6 The specific flow chart of step 210 and step 220 is shown; Figure 8 yes Figure 5 A specific flow chart of step 110 is shown; Fig. 9 yes Figure 5 Another specific flow chart of step 110 is shown; Fig.10 It is a schematic diagram of the overall process of off-grid startup wiring detection of the converter system provided by an embodiment of the present invention; Fig.11 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, and also uses multiple converters combined in parallel, 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 abnormal phase line wiring (such as reverse phase line connection, phase line detachment) 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 connections should be consistent, when the AC power grid does not supply power to the convergence switching control device and the converter is required to supply power, the target converter is controlled to output different voltages to each interface of the first interface group of the convergence switching control device, thereby making the voltages of each corresponding interface different, and then 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 judged.

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

[0028] Reference Figure 1 , Figure 1It is a structural diagram of the 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 (Local 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, B phase line, C phase line and N line (i.e., neutral line or zero 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. interfaces, wherein the first interface group 110 can be connected to the grid interface group 300 and can also be connected to the load interface group 400, that is, the first interface group 110 is not only connected to each interface in the grid interface group 300 and / or the load interface group 400, but can also be connected to each interface in the second interface group 210 of each converter 200, that is, the second interface group 210 of each converter 200 is connected to the grid interface group 300 and / or the load interface group 400 through the first interface group 100 to supply power to the grid and / or the load.

[0029] Specifically, the number of converters 200 in the converter system may be one or more, and the converter 200 includes a second interface group 210, the second interface group 210 includes a plurality of interfaces corresponding to the AC power grid, and the second interface group 210 is connected to the first interface group 110 through a phase line. That is, in the case where 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. In the case of normal wiring, 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. In the case where the grid interface group 300, the first interface group 110, and the load interface group 400 all include interfaces for connecting to the N line, the converter 200 may also be provided with an N line interface for connecting to the N line. 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 may be consistent.

[0030] Reference Figure 2 , Figure 2It is a structural schematic diagram of a converter system provided by another embodiment of the present invention. A converter control switch 120 may also be provided in the convergence switching control device 100. Each interface in the first interface group 110 is connected one-to-one with each converter control switch 120, that is, each interface in the first interface group 110 is correspondingly connected to one end of the converter control switch 120, and the other end of the converter control switch 120 is connected to an interface in the grid interface group 300; in addition, the load interface group 400 is used to simultaneously connect the other end of the converter control switch 120 and the grid interface group 300, and the load interface group 400 is connected to the connection point between the converter control switch 120 and the grid interface group 300, so as to realize the control of the converter 200 to supply power to the AC grid and / or the load.

[0031] It should be noted that the grid interface group 300 can be connected to the corresponding converter control switch 120 through the grid control switch 310, so that the grid connection and off-grid connection of the converter system can be achieved by controlling the closing or opening of the grid control switch 310, and it can also be realized whether the AC power grid supplies power to the convergence switching control device 100, or the convergence switching control device 100 supplies power to the AC power grid; and the load interface group 400 can be connected to the connection point between the converter control switch 120 and the grid control switch 310 through the load control switch 410, so that by controlling the load control switch 410, it can be controlled whether the load is powered from the AC power grid and / or the converter 200 for operation.

[0032] It should be noted that the phase control switch may include a current conversion control switch 120 and / or a load control switch 410 .

[0033] Reference Figure 3 , Figure 3 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.

[0034] Reference Figure 4 , Figure 4 FIG. 1 is a connection diagram of a converter system provided by an embodiment of the present invention in an off-grid parallel scenario. Figure 4 As shown, in an off-grid parallel scenario, a plurality of converters 200 are arranged in the converter system, and the convergence switching control device 100 disconnects the access to the AC power grid, while the converter control switch 120 and the load control switch 410 can be used to control whether the converter 200 supplies power to the load.

[0035] The local system controller is used to control and manage the entire converter system. The local system controller is connected to the convergence switching control device 100 and all converters 200 respectively. Specifically, the local system controller can control the closing and opening of each converter control switch 120, load control switch 410 and grid control switch 310 in the convergence switching control device 100, and can also perform voltage sampling on each first interface group 110 of the convergence switching control device 100 and 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. It should be noted that the local system controller can be undertaken by any converter 200 in the converter system, or by the convergence switching control device 100, or by an independent system controller.

[0036] It can be understood by those skilled in the art that Figures 1 to 4 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.

[0037] Reference Figure 5 , Figure 5 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 or Figure 4 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 does not supply power to the bus switching control device, control the target converter to output different voltages to each interface in the first interface group, and control all converters except the target converter to stop running; Step S120: acquiring interface reference 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 wiring detection result of each converter according to the interface reference voltage and all second interface voltages in phase with the interface reference voltage.

[0038] It is understandable that, when the load interface group needs to be powered, if the detected grid interface group is not powered, or the grid control switch is in the disconnected state, or if Figure 4 The converter system shown is not connected to the AC power grid, which means that the AC power grid is not currently supplying power to the convergence switching control device and the load interface group. It is necessary to control the converter to start off-grid to supply power to the load interface group. At this time, the phase line connection relationship between each converter and the convergence switching control device can be detected. First, select one converter from multiple converters as the target converter, then only control the target converter to start, and control the target converter to output three-phase inconsistent voltages, that is, each interface in the second interface group of the target converter outputs an output voltage with a different voltage value, and the remaining converters stop running, and the target converter supplies power to the first interface group and the second interface groups of the remaining converters.

[0039] If the phase line connection between each converter and the convergence switching control device is normal, then the interface voltage of each interface in the same phase should be consistent with the voltage output by the target converter. The voltage output by each interface of the target converter is used as the reference. Since the first interface group is only powered by the voltage output by the target converter, at this time, the voltage of each interface in the first interface group is consistent with the voltage output by the target converter. Therefore, the voltage measured at each interface in the first interface group can be used as the interface reference voltage, and then the interface reference voltage and all the second interface voltages under the same phase are compared to determine whether the connection of each converter is normal, and whether the connection of the converter is normal is used as the connection detection result of each converter.

[0040] In the off-grid scenario of the converter system, by controlling the target converter to output different voltages to each interface of the first interface group, the interface voltages of all interfaces are different. Then the interface voltages of all interfaces are obtained and the interface voltages of the same phase are compared. The wiring conditions of each converter can be quickly, accurately and comprehensively determined.

[0041] It should be noted that the convergence switching control device may not be connected to the AC power grid, that is, the converter system is in a purely off-grid state, and the wiring detection method provided in the embodiment of the present invention may also be used to detect the wiring condition between the converter and the convergence switching control device.

[0042] It is worth noting that when the convergence switching control device adopts three-phase three-wire to supply power to the load or AC power grid, the interface reference 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 convergence switching control device adopts two-phase three-wire (split-phase) system to supply power to the AC power grid or load, the interface reference voltage and the second interface voltage obtained may refer to the split-phase voltage generated between the two-phase power supply.

[0043] Reference Figure 6 , a wiring detection method provided by an embodiment of the present invention, Figure 5 In the step S130 shown, the wiring detection method further includes step S210 or step S220: Step S210: when the second interface voltage is inconsistent with the interface reference voltage in phase with the second interface voltage, determining that the converter connection corresponding to the second interface voltage is abnormal; or, Step S220: When all the second interface voltages are consistent with the interface reference voltage that is in phase with the second interface voltage, it is determined that all the converter connections are normal.

[0044] After obtaining the interface reference voltage and the second interface voltage, the interface reference voltage and the second interface voltage under the same phase can be compared to determine whether each second interface voltage is consistent with the interface reference voltage of the same phase. Since the interface reference voltages of each phase are different at this time, when the second interface voltage is consistent with the interface reference voltage of the same phase, it can be said that the corresponding second interface group wiring is normal, and there is no need to determine the phase sequence.

[0045] In the process of comparing and judging each second interface voltage using the interface reference voltage, if any second interface voltage is inconsistent with the interface reference voltage under the same phase, it can be determined that there is a wiring abnormality between the converter and the convergence switching control device, and the interface with abnormal wiring can be quickly located. Specifically, if a second interface voltage is inconsistent with the interface reference voltage in the same phase, it means that the wiring between the interface in the second interface group corresponding to the second interface voltage and the interface in the first interface group corresponding to the interface reference voltage is abnormal; if each second interface voltage is consistent with the interface reference voltage of the same phase, it can be considered that the wiring between all converters (including the target converter) and the convergence switching control device is normal.

[0046] It should be noted that the second interface voltage obtained by voltage sampling at the second interface group of the target converter is consistent with the same corresponding interface reference voltage.

[0047] Reference Figure 7 , a wiring detection method provided by an embodiment of the present invention, Figure 6 In the step S210 shown, the wiring detection method further includes steps S310 and S320: Step S310: Calculating the difference between the interface reference voltage and all second interface voltages in phase with the interface reference voltage to obtain a plurality of voltage differences corresponding to the second interface voltages; Step S320: When the voltage difference is greater than or equal to the preset voltage difference threshold, it is determined that the inverter connection corresponding to the voltage difference is abnormal.

[0048] It can be understood that whether the two voltages are consistent can be determined by calculating the voltage difference between the two voltages. The voltage difference can be obtained by subtracting the second interface voltage of the same phase from the interface reference voltage. The larger the voltage difference, the greater the deviation between the second interface voltage and the interface reference voltage. The preset voltage difference threshold means the allowable error range for determining the voltage measurement. If the voltage difference exceeds the preset voltage difference threshold, it can be said that the two voltages are not equal. Therefore, if the voltage difference is greater than or equal to the preset voltage difference threshold, it means that the current interface reference voltage is inconsistent with the second interface voltage of the same phase. Therefore, the wiring abnormality can be located to the converter corresponding to the voltage difference that exceeds the preset voltage difference threshold, or the wiring abnormality can be located to the interface in the second interface group corresponding to the second interface voltage.

[0049] It should be noted that when any interface reference voltage is inconsistent with the second interface voltage of the same phase, it can be determined that the converter wiring is abnormal, and then the converter system can be inspected and maintained.

[0050] Specifically, each interface of the first interface group in the confluence switching control device can measure the interface reference voltage of each phase, including the interface reference voltage of phase A. , interface reference voltage of phase B Interface reference voltage of phase C , and the second interface group in each converter can measure the second interface voltage of each phase, including the second interface voltage of phase A , the second interface voltage of phase B and the second interface voltage of phase C The calculation process of each voltage difference corresponding to the second interface voltage can refer to the following formulas (1) to (3): (1); (2); (3); in, Indicates The second interface voltage of phase A of the converter is , Indicates the total number of converters. The absolute value of the voltage difference between the interface reference voltage and the second interface voltage is used to make a wiring judgment. If it does not meet the , , If any of the following conditions is met, it can be considered that there is a wiring abnormality in the converter system. represents the preset pressure difference threshold. Therefore, the sampling voltage of the first interface group of the confluence switching control device is , and (i.e., interface reference voltage) as the reference for comparison, satisfying The converter with abnormal wiring is the converter with abnormal wiring, that is, the abnormal wiring phenomenon is located in the specific converter.

[0051] Reference Figure 7 , a wiring detection method provided by an embodiment of the present invention, Figure 6 In the step S220 shown, the wiring detection method further includes steps S310 and S330: Step S310: Calculating the difference between the interface reference voltage and all second interface voltages in phase with the interface reference voltage to obtain a plurality of voltage differences corresponding to the second interface voltages; Step S330: When all voltage difference values ​​are less than the preset voltage difference threshold, it is determined that all converter connections are normal.

[0052] It can be understood that if the voltage difference between the interface reference voltage and the second interface voltage of the same phase is less than the preset voltage difference threshold, it can be considered that the current interface reference voltage is consistent with the second interface voltage of the same phase, that is, the interface wiring corresponding to the current second interface voltage is normal. If all voltage differences are less than the preset voltage difference threshold, that is, all second interface voltages are consistent with the interface reference voltage of the same phase, it satisfies , , If all the conditions are met, the wiring of the converter system can be considered normal.

[0053] Reference Figure 8 , a wiring detection method provided by an embodiment of the present invention, Figure 5 In the step S110 shown, the wiring detection method further includes steps S410 to S430: Step S410: obtaining an initial output voltage and a voltage superposition amount corresponding to each interface in the first interface group; Step S420: superimposing each voltage superposition amount with the initial output voltage to obtain a plurality of interface output voltages corresponding to each interface in the first interface group; Step S430: controlling the target converter to output a corresponding interface output voltage to each interface in the first interface group.

[0054] It can be understood that, taking the converter system adopting three-phase power transmission as an example, the second interface group in each converter includes three corresponding interfaces, and the three interfaces in the second interface group of the target converter are controlled to output different voltages. For example, taking converter PCS_1 as the target converter, the output rated voltage of the target converter can be obtained. As the initial output voltage, three corresponding voltage superposition components are obtained, and the three corresponding voltage superposition components may include: +15V A phase voltage superposition component , 0V B phase voltage superposition component The superposition component of the C phase voltage of -15V , and then the three corresponding voltage superposition components are superimposed on the initial output voltage to obtain the interface output voltage shown in the following equations (4) to (6): (4); (5); (6); in, Indicates the interface output voltage of the converter PCS_1 at the A phase interface. Indicates the interface output voltage of the converter PCS_1 at the B phase interface. Indicates the interface output voltage output by converter PCS_1 at the C phase interface, the interface output voltage output by converter PCS_1 at each phase to the first interface group, that is, the interface reference voltage measured at each interface of the first interface group. Therefore, since the corresponding voltage superposition components are inconsistent, the interface output voltage obtained by superposition is also inconsistent. At this time, the voltage of the first interface group and all the second interface groups of the confluence switching control device is sampled, and the interface reference voltage of the first interface group and the second interface voltage of the second interface group can be obtained. By judging whether the second interface voltage is consistent with the interface reference voltage of the same phase, it can be judged whether the wiring of the interface in the corresponding second interface group is normal. Among them, since all converters need to be started to supply power to the load, the voltage provided by multiple converters can drive the load to operate. In the embodiment of the present invention, only one converter is started for wiring detection, and the voltage output by one converter is not sufficient to drive the load to operate. That is to say, before the converter system supplies power to the load, the wiring between all converters and the convergence switching control device in the converter system can be detected, and the wiring status of each interface can be quickly and comprehensively judged. The interface with abnormal wiring can be quickly located, and errors can be discovered in time before the converter system supplies power to the load.

[0055] Reference Fig. 9 , a wiring detection method provided by an embodiment of the present invention, Figure 5 In the step S110 shown, the wiring detection method further includes steps S510 to S520: Step S510: when the AC power grid does not supply power to the bus switching control device, all phase control switches are controlled to be disconnected; Step S520: Control the target converter to output different voltages to the interfaces in the first interface group, and control all converters except the target converter to stop running.

[0056] It is understandable that, combined with Figure 2 , when a phase control switch is provided in the confluence switching control device to control the connection between the converter and the load, if the AC power grid does not supply power to the load at this time, that is, the power grid interface group is in an unpowered state, the converter needs to supply power to the load. Therefore, it is necessary to control all phase control switches to be disconnected so that each converter can be connected to the load for power supply. First, all phase control switches are disconnected, and one converter is selected from multiple converters as the target converter, and then only the target converter is controlled to start, and the target converter is controlled to output three-phase inconsistent voltages at the same time, that is, each interface in the second interface group of the target converter outputs voltages of different voltage values, and the remaining converters are stopped, and the target converter supplies power to the first interface group and the second interface groups of the remaining converters. It is worth noting that the phase control switch can refer to a converter control switch and / or a load control switch, that is, all converter control switches can be disconnected, or all load control switches can be disconnected, or all converter control switches and all load control switches can be disconnected at the same time.

[0057] Taking the converter using three-phase power to supply power to the bus switching control device as an example, refer to Fig.10 , Fig.10 FIG. 1 is a schematic diagram of the overall process of off-grid startup wiring detection of the converter system provided by an embodiment of the present invention. Fig.10 As shown, in step S601, when it is detected that the AC power grid does not supply power to the convergence switching control device, that is, the power grid control switch is disconnected, or the power grid interface group is in a non-powered state, the converter needs to be started off-grid to supply power to the convergence switching control device, and then to the load interface group; then, in step S602, all phase control switches are disconnected, any converter is controlled to start, and different voltages are output to each interface in the first interface group of the convergence switching control device; in step S603, the interface reference voltages of all interfaces in the first interface group of the convergence switching control device and all interfaces in the second interface group of each converter are collected. The second interface voltage of the interface; then, in step S604, for each second interface voltage, the second interface voltage is compared with an interface reference voltage of the same phase; if any second interface voltage is inconsistent with the interface reference voltage of the same phase, step S605 can be executed, in which it can be determined that the wiring of the converter system 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 interface reference voltage of the same phase, step S606 can be executed to determine that the wiring of the converter system is normal, and drive all converters to supply power to the convergence switching control device.

[0058] Second, refer to Fig.11 The embodiment of the present invention provides an operation control device 1100, including a memory 1120, a processor 1110, and a computer program stored in the memory 1120 and executable on the processor 1110. The processor 1110 executes the program to implement the wiring detection method of the first embodiment or the wiring detection method of the second embodiment, for example, Figure 5 In the method steps S110 to S130, Figure 6 Steps S210 to S220 of the method, or performing Figure 7 Steps S310 to S330 of the method, or performing Figure 8 or performing steps S410 to S430 of the method Fig. 9 Method steps S510 to S520 in.

[0059] According to the operation control device provided by the embodiment of the present invention, since the interface voltages in the same phase line connection should be consistent, when the AC power grid does not supply power to the convergence switching control device and the converter is required to supply power, the target converter is controlled to output different voltages to each interface of the first interface group of the convergence switching control device, thereby making the voltages of each corresponding interface different, and then 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 judged.

[0060] 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.

[0061] According to the wiring detection device provided in an embodiment of the present invention, since the interface voltages in the same phase line wiring should be consistent, when the AC power grid does not supply power to the convergence switching control device and the converter is required to supply power, the target converter is controlled to output different voltages to each interface of the first interface group of the convergence switching control device, thereby making the voltages of each corresponding interface different, and then 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.

[0062] 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 5 In the method steps S110 to S130, Figure 6 Steps S210 to S220 of the method, or performing Figure 7Steps S310 to S330 of the method, or performing Figure 8 or performing steps S410 to S430 of the method Fig. 9 Method steps S510 to S520 in.

[0063] According to the computer-readable storage medium provided in an embodiment of the present invention, since the interface voltages in the same phase line connection should be consistent, when the AC power grid does not supply power to the convergence switching control device and the converter is required to supply power, the target converter is controlled to output different voltages to each interface of the first interface group of the convergence switching control device, thereby making the voltages of each corresponding interface different, and then 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.

[0064] 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.

[0065] 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 plurality of converters and a bus switching control device for accessing an AC power grid, wherein the bus switching control device comprises a first interface group for connecting to a load, and the converter comprises a second interface group correspondingly connected to the first interface group via the phase line, wherein: The wiring detection method comprises: When the AC power grid does not supply power to the convergence switching control device, control the target converter to output different voltages to each interface in the first interface group, and control all converters except the target converter to stop running, wherein the target converter is any one of the multiple converters; Acquire interface reference 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 interface reference voltage and all the second interface voltages in phase with the interface reference voltage.

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

3. The wiring detection method according to claim 2, characterized in that: When the second interface voltage is inconsistent with the interface reference voltage in phase with the second interface voltage, determining that the converter connection corresponding to the second interface voltage is abnormal includes: Calculating the difference between the interface reference voltage and all the second interface voltages in phase with the interface reference voltage to obtain a plurality of voltage difference values ​​corresponding to the second interface voltages; When the voltage difference is greater than or equal to a preset voltage difference threshold, it is determined that the inverter connection corresponding to the voltage difference is abnormal.

4. The wiring detection method according to claim 1, characterized in that: The step of determining the wiring detection result of each of the converters according to the interface reference voltage and all the second interface voltages in phase with the interface reference voltage comprises: When all the second interface voltages are consistent with the interface reference voltage that is in phase with the second interface voltage, it is determined that all the converter connections are normal.

5. The wiring detection method according to claim 2, characterized in that: When all the second interface voltages are consistent with the interface reference voltage in phase with the second interface voltage, determining that all the converter connections are normal includes: Calculating the difference between the interface reference voltage and all the second interface voltages in phase with the interface reference voltage to obtain a plurality of voltage difference values ​​corresponding to the second interface voltages; When all the voltage difference values ​​are smaller than the preset voltage difference threshold, it is determined that all the converter connections are normal.

6. The wiring detection method according to claim 1, characterized in that: The controlling the target converter to output different voltages to each interface in the first interface group includes: Acquire an initial output voltage and a voltage superposition amount corresponding to each interface in the first interface group, wherein different voltage superposition amounts are different; Superimposing each of the voltage superposition amounts with the initial output voltage respectively to obtain a plurality of interface output voltages corresponding to each interface in the first interface group, wherein different interface output voltages are different; The target converter is controlled to output the corresponding interface output voltage to each interface in the first interface group.

7. The wiring detection method according to claim 1, characterized in that: The confluence switching control device further includes a plurality of phase control switches for controlling the conduction relationship between the converter and the load, each of the phase control switches being correspondingly connected to each interface in the first interface group; When the AC power grid does not supply power to the bus switching control device, controlling the target converter to output different voltages to each interface in the first interface group, and controlling all converters except the target converter to stop running, includes: When the AC power grid does not supply power to the current-converging switching control device, all the phase control switches are controlled to be disconnected; The target converter is controlled to output different voltages to the interfaces in the first interface group, and all converters except the target converter are controlled to stop running.

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.

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