A detection method and related apparatus

Abstract

A detection method and related apparatus determine whether the first and second converters are connected to the same busbar device (101, 102) by judging the output port voltage signals of the first and second converters, thereby generating first or second information to inform the operator. Generally, if the first and second converters in a busbar system are not connected to the same busbar device (101, 102), it can be considered that the wiring of the first or second converter is incorrect. This detection method and related apparatus can quickly and accurately determine whether there is a wiring error in the converter busbar system in application scenarios where the voltage information of the busbar point (103, 104) cannot be obtained.

Description

Technical Field

[0001] This application relates to the field of power technology, and in particular to a detection method and related apparatus. Background Technology

[0002] In practical applications, converters typically use combiner devices to combine their outputs before outputting the power. This satisfies high-power requirements and facilitates unified management. When combining converter outputs, there are specific requirements regarding which combiner devices the pre-selected equipment should connect to. This is necessary to ensure power distribution meets design requirements, and because different converter input types require that their outputs not be connected together; otherwise, it could cause system startup failure or even equipment damage. These combiner devices include, but are not limited to, combiner distribution cabinets, transformer cabinets, and other equipment with combiner functions.

[0003] Based on the above requirements, after the converter is wired in the application field, wiring errors need to be identified in advance to prevent accidents caused by wiring errors.

[0004] Currently, the correct connection of the converter's output to the corresponding busbar is determined by detecting the voltage at the converter's output terminal and the voltage at the busbar point. However, this method requires the busbar device to be able to detect the voltage information at the busbar point, which is not feasible for busbar devices without a relevant voltage detection module. Summary of the Invention

[0005] This application provides a detection method and related apparatus that can quickly and accurately determine whether there is a wiring error in the converter bus system in application scenarios where the bus voltage information cannot be obtained.

[0006] In a first aspect, embodiments of this application provide a detection method, comprising: when a first converter is working and a second converter is not working, a main controller acquires the output port voltage signal of the first converter; the main controller acquires the output port voltage signal of the second converter; if the output port voltage signal of the first converter and the output port voltage signal of the second converter satisfy a preset matching relationship, the main controller generates first information, the first information indicating that the output port of the first converter and the output port of the second converter are connected to the same busbar device; if the output port voltage signal of the first converter and the output port voltage signal of the second converter do not satisfy the preset matching relationship, the main controller generates second information, the second information indicating that the output port of the first converter and the output port of the second converter are connected to different busbar devices, and indicating that the wiring of the first converter or the wiring of the second converter is incorrect.

[0007] In this embodiment, the detection method can determine whether the first and second converters are connected to the same busbar device in application scenarios where the busbar voltage information cannot be obtained. This is achieved by using the output port voltage signals of the first and second converters. The method then generates first or second information to inform the operator. Generally, if the first and second converters in a busbar system are not connected to the same busbar device, it can be assumed that either the first or second converter is incorrectly wired. Therefore, the detection method provided in this embodiment can quickly and accurately determine whether a wiring error exists in the converter busbar system.

[0008] In conjunction with the first aspect, in one implementation provided in this application embodiment, before the main controller instructs the first converter to start working, the method further includes: the main controller determining the first converter from multiple converters in the bus system according to an input instruction. The bus system includes the first converter, the second converter, and a bus device for busing the multiple converters. In this implementation, the main controller pre-determines the master (first converter) and slave (second converter) from the multiple converters in the bus system. Then, all slaves perform the judgment process as described in the first aspect with the master, which is one specific implementation. Furthermore, in this implementation, the master is working while the slaves are not working. Therefore, when all slaves perform the judgment process as described in the first aspect with the master, the master does not need to stop but can continue to work, enabling the connection status of all converters to be determined quickly and orderly.

[0009] In conjunction with the first aspect, in one implementation provided by the embodiments of this application, the busbar device that combines multiple converters is one of a busbar distribution cabinet or a split transformer. This implementation provides a specific type of busbar device, making the solution provided by the embodiments of this application more comprehensive.

[0010] In conjunction with the first aspect, in one implementation provided in this application embodiment, the voltage signal is one of a DC signal, an AC signal, or a preset waveform signal. This implementation provides a specific type of voltage signal, making the solution provided in this application embodiment more comprehensive.

[0011] In conjunction with the first aspect, in one implementation provided by the embodiments of this application, the converter is one of a DC-to-DC converter, a DC-to-AC converter, and an AC-to-DC converter. This implementation provides a specific type of converter, making the solution provided by the embodiments of this application more comprehensive.

[0012] In conjunction with the first aspect, in one implementation provided by the embodiments of this application, the main controller communicates with the first converter and the second converter via wireless signals or wired communication. This implementation provides a communication method between the main controller and each converter, making the solution provided by the embodiments of this application more comprehensive.

[0013] In conjunction with the first aspect, in one implementation provided by the embodiments of this application, the matching relationship is one of amplitude relationship, phase relationship, or frequency relationship. This implementation provides a specific form of the matching relationship, making the solution provided by the embodiments of this application more comprehensive.

[0014] In conjunction with the first aspect, in one implementation provided by this application, the preset matching relationship between the output port voltage signal of the first converter and the output port voltage signal of the second converter specifically includes: the difference between the amplitude of the component of the output port voltage of the first converter at a specified frequency and the amplitude of the component of the output port voltage of the second converter at a specified frequency is less than a preset fault threshold; the preset matching relationship between the output port voltage signal of the first converter and the output port voltage signal of the second converter not satisfying the preset matching relationship specifically includes: the difference between the amplitude of the component of the output port voltage of the first converter at a specified frequency and the amplitude of the component of the output port voltage of the second converter at a specified frequency is not less than a preset fault threshold. This implementation provides specific judgment conditions corresponding to the output port voltage signals of the first and second converters, making the solution provided by this application more comprehensive.

[0015] Secondly, embodiments of this application provide a main controller, including a processor, a memory, and a communication interface; the memory stores a computer program; the communication interface is used to communicate with a converter; the processor is used to execute the computer program stored in the memory, so that the main controller implements the method of the first aspect.

[0016] Thirdly, embodiments of this application provide a detection device, comprising: an acquisition module, configured to acquire, when a second converter is not operating and a first converter is operating, an output port voltage signal of the first converter and an output port voltage signal of the second converter; a processing module, configured to generate first information when the output port voltage signal of the first converter and the output port voltage signal of the second converter satisfy a preset matching relationship, the first information indicating that the output ports of the first converter and the second converter are connected to the same busbar device; and the processing module further configured to generate second information when the output port voltage signal of the first converter and the output port voltage signal of the second converter do not satisfy the preset matching relationship, the second information indicating that the output ports of the first converter and the second converter are connected to different busbar devices, and indicating a wiring error in either the first or second converter. The technical effects of the device of this third aspect can be understood with reference to the related effects in the method section of the first aspect described above, and will not be repeated here.

[0017] In conjunction with the third aspect, in one implementation provided in this application embodiment, the processing module is further configured to: determine a first converter from multiple converters in a bus system according to an input instruction, wherein the bus system includes a first converter, a second converter, and a bus device for busing multiple converters.

[0018] In conjunction with the third aspect, in one implementation provided in the embodiments of this application, the busbar device that combines multiple converters is either a busbar distribution cabinet or a split transformer.

[0019] In conjunction with the third aspect, in one implementation provided in the embodiments of this application, the voltage signal is one of a DC signal, an AC signal, or a preset waveform signal.

[0020] In conjunction with the third aspect, in one implementation provided in the embodiments of this application, the converter is one of a DC-to-DC converter, a DC-to-AC converter, and an AC-to-DC converter.

[0021] In conjunction with the third aspect, in one implementation provided in the embodiments of this application, the communication interface communicates with the first converter and the second converter via wireless signal communication or wired communication.

[0022] In conjunction with the third aspect, in one implementation provided in the embodiments of this application, the matching relationship is one of amplitude relationship, phase relationship or frequency relationship.

[0023] In conjunction with the third aspect, in one implementation provided in this application embodiment, the preset matching relationship between the output port voltage signal of the first converter and the output port voltage signal of the second converter specifically includes: the difference between the amplitude of the component of the output port voltage of the first converter at a specified frequency and the amplitude of the component of the output port voltage of the second converter at a specified frequency is less than a preset fault threshold; the preset matching relationship between the output port voltage signal of the first converter and the output port voltage signal of the second converter not satisfying the preset matching relationship specifically includes: the difference between the amplitude of the component of the output port voltage of the first converter at a specified frequency and the amplitude of the component of the output port voltage of the second converter at a specified frequency is not less than a preset fault threshold. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of one wiring configuration;

[0025] Figure 2 A flowchart of the detection method provided in the embodiments of this application;

[0026] Figure 3 A schematic diagram of the system architecture in one application example provided in this application;

[0027] Figure 4 This is a schematic diagram of the detection steps of the bus system 1 in the application example of this application;

[0028] Figure 5 This is a schematic diagram of the detection steps of the bus system 2 in the application example of this application;

[0029] Figure 6 A schematic diagram of a detection device provided in an embodiment of this application;

[0030] Figure 7 This is a schematic diagram of the architecture of the main controller provided in an embodiment of this application. Detailed Implementation

[0031] The technical solutions in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0032] In practical applications, converters often use combiner devices to combine their outputs before outputting the power. This satisfies high-power requirements and facilitates unified management. When combining converter outputs, there are specific requirements regarding which combiner devices the pre-selected equipment should connect to. This is necessary to ensure power distribution meets design requirements, and because different converter input types require that their outputs not be connected together, otherwise, it could cause system startup failure or even equipment damage. These combiner devices include, but are not limited to, combiner distribution cabinets, transformer cabinets, and other devices with combiner functions. Based on these requirements, after the converter wiring is completed at the application site, wiring errors need to be identified in advance.

[0033] To ensure clarity in the description of the following embodiments, the meaning of wiring errors will first be explained in detail. Figure 1 This is a schematic diagram of one wiring configuration. Figure 1 In the circuit diagram, converters 1, 2, ..., n should all be connected to combiner 101 (converters 1 through n need to be combined through combiner 101), and converters n+1, n, ..., 2n should all be connected to combiner 102 (converters n+1 through 2n are combined through combiner 102). However, if a wiring error occurs during wiring, converter n may be incorrectly connected to combiner 102 (as shown by the dotted line) and converter 2n may also be incorrectly connected to combiner 101 (as shown by the dotted line). Figure 1 The error indicated by the dashed line can be understood as a wiring error. In practical applications, other errors may also occur, such as missing wiring or broken cables, which can also be understood as wiring errors. This application embodiment does not limit this to the above.

[0034] Current solutions for wiring errors typically involve determining the correct wiring by comparing the converter output voltage with the combiner point voltage after the combiner device is powered on at a time-sharing configuration. Specifically, the system contains a central control unit (main controller) that collects the output voltages of all converters and the voltage at the combiner device's backend. Once the combiner point voltage is detected to be stable, the system collects the output voltages of all converters. If the voltage at the converter port connected to combiner device 101 matches a pre-set relationship with the voltage at the combiner point, the converter is considered correctly wired; otherwise, the wiring is incorrect. Similarly, combiner device 102 performs the same determination. For example... Figure 1 As shown, the combiner point 103 of combiner device 101 is connected to converters 1 to n-1, while converter n is incorrectly connected to the combiner point 104 of combiner device 102. The combiner point 104 of combiner device 102 is connected to converters n+1 to 2n-1, while converter 2n is incorrectly connected to the combiner point 103 of combiner device 101. At this time, the main controller can collect the output voltages of all converters and the voltage at the downstream end of the combiner device (i.e., the combiner point voltage). Then, the main controller determines whether the converter port voltage and the voltage at the combiner point meet the preset relationship. Generally, the port voltage of converter n and the voltage at the combiner point will not meet the preset relationship, so the main controller can determine that converter n is wired incorrectly based on this situation. Similarly, the wiring of converter 2n can be determined to be incorrect.

[0035] However, this approach is not compatible with all busbar devices. For example, the two or more low-voltage windings of a split transformer can be considered as different busbar devices. Multiple busbar devices cannot be powered on at different times. Also, if the downstream of the busbar device is a load, it cannot provide a stable voltage.

[0036] Another approach is to determine the correctness of the converter's output voltage by comparing it with the voltage at the busbar. The system includes a main controller that controls the output voltage of converter 1, which is pre-set to be connected to busbar 101. If the voltage at busbar 103 of busbar 101 matches the pre-set relationship with the output voltage of converter 1, the converter is correctly wired; otherwise, the wiring is incorrect. Similarly, the same judgment is applied to other converters pre-set to be connected to busbar 101 and other converters pre-set to be connected to other busbars, thus verifying the correctness of each converter's wiring.

[0037] However, both of these solutions have the drawback of requiring the acquisition of voltage information at the busbar point. In most traditional busbar device applications, this information is often unavailable because traditional busbar devices typically lack a detection module to measure it. Therefore, implementing either of these solutions would require adding an additional module to acquire the busbar point voltage, necessitating costly modifications.

[0038] In view of this, the embodiments of this application provide a detection method that can quickly and accurately determine whether there is a wiring error in the converter bus system in application scenarios where the bus voltage information cannot be obtained. Figure 2 This is a flowchart of a detection method provided in an embodiment of this application. This detection method is applicable when the first converter is working and the second converter is not working. The following is a detailed description of the situation where the first converter is working and the second converter is not working.

[0039] like Figure 1 The wiring configuration shown includes two bus systems. One bus system consists of bus device 101 and converters 1 to n, while the other bus system consists of bus device 102 and converters n+1 to 2n. This embodiment uses the first bus system as an example for explanation; the other bus system can be implemented with reference to this example, and will not be described further in this embodiment.

[0040] In this bus system, converters 1 through n should all be connected to bus device 101. Therefore, one converter from 1 to n can be selected as the master converter (also called the first converter), and the other converters can be used as slave converters (also called non-master converters or second converters). In this embodiment, the master controller can select one converter from 1 to n as the master converter. The selection method can be based on a certain algorithm or direct random selection, and this embodiment does not limit this. In practical applications, the master converter can also be selected by staff, and this is not limited.

[0041] The main controller in this application embodiment can be a standalone device or the converter itself. For example, when the main controller is a standalone device, it communicates with each converter via wireless or wired communication. As another example, when the main controller is converter 1 itself, it can be implemented by logic circuitry in converter 1, or by a processor in converter 1 executing code in memory, or in other forms, which will not be elaborated upon in this application.

[0042] In this embodiment, the main controller can instruct the host (first converter) to operate while the slave (second converter) remains inactive. Specifically, host operation means that the converter operates according to its functions. For example, if the converter is an inverter (DC-to-AC converter), then operation means that the inverter performs the function of converting DC power to AC power. In other cases, the converter may also be a DC-to-DC converter or an AC-to-DC converter; this embodiment does not limit this. In some embodiments, the converter's operation may not be the same each time, leading to certain errors. Therefore, to more accurately detect wiring errors, the main controller can instruct the host to output a preset disturbance signal (hereinafter referred to as: disturbance signal). For example, the main controller can instruct the host to output a preset waveform signal. In practical applications, the main controller can also instruct the host to output DC signals, AC signals, etc.; this embodiment does not limit this.

[0043] In this embodiment, the circuit / module on the converter used to detect the voltage signal at the converter output port remains powered on and operates even when the converter is not in operation, thus enabling it to detect the voltage signal at the converter output port. Therefore, regardless of whether the master unit is working or the slave unit is not working, the converter can detect the output port voltage signal and report it to the master controller.

[0044] Based on the above, the main controller can execute the following process:

[0045] 201. Obtain the output port voltage signal of the first converter;

[0046] In this embodiment, when the first converter is operating, the output port voltage signal of the first converter can be a preset "disturbance signal". The detection circuit in the first converter can detect the output port voltage signal and upload it to the main controller, so that the main controller can obtain the output port voltage signal of the first converter.

[0047] In some embodiments, the main controller may send a command to the first converter, instructing the detection circuit in the first converter to detect the output port voltage signal and upload it to the main controller. In other embodiments, the detection circuit in the first converter detects the output port voltage signal and uploads it to the main controller at regular intervals. This application does not limit this approach.

[0048] 202. Obtain the output port voltage signal of the second converter;

[0049] In this embodiment, when the second converter is not working, the detected output port voltage signal of the second converter can be referred to as a "characteristic signal". The detection circuit in the second converter can detect this output port voltage signal and upload it to the main controller, so that the main controller can obtain the output port voltage signal of the second converter.

[0050] In some embodiments, the main controller may send a command to the second converter, instructing the detection circuit in the second converter to detect the output port voltage signal and upload it to the main controller. In other embodiments, the detection circuit in the second converter detects the output port voltage signal and uploads it to the main controller at regular intervals. This application does not limit this approach.

[0051] 203. Determine whether the output port voltage signal of the first converter and the output port voltage signal of the second converter meet the preset matching relationship. If yes, proceed to step 204; otherwise, proceed to step 205.

[0052] In this embodiment of the application, after the main controller receives the output port voltage signal (also known as the disturbance signal or disturbance voltage) of the first converter and the output port voltage signal (also known as the characteristic signal or characteristic voltage) of the second converter, it can determine whether the output port voltage signal of the first converter and the output port voltage signal of the second converter meet the preset matching relationship.

[0053] The matching relationship can be an amplitude relationship, a phase relationship, or a frequency relationship, etc., and this application embodiment does not limit this. The following description will take the amplitude relationship as an example. Other situations can be referred to the embodiments of this application and will not be repeated. For example, the perturbation signal and the characteristic signal can satisfy the preset matching relationship if the absolute value of the difference between the voltage amplitude of the perturbation signal and the voltage amplitude of the characteristic signal is less than the fault threshold. For example, if the voltage amplitude of the perturbation signal is 10V, the voltage amplitude of the characteristic signal is 10.1V, and the fault threshold is 1V, then the absolute value of the difference between the voltage amplitude of the perturbation signal and the voltage amplitude of the characteristic signal is 0.1V, which is less than the fault threshold of 1V. The main controller can then determine that the output port voltage signal (perturbation signal) of the first converter and the output port voltage signal (characteristic signal) of the second converter satisfy the preset matching relationship based on this situation. In practical applications, other set matching relationships can also achieve the solution of this application, and this application embodiment does not limit this.

[0054] In practical applications, determining whether the disturbance signal and the characteristic signal satisfy a preset matching relationship can include the following specific methods: First, obtain the amplitude of the output port voltage signal of the first converter at a specified frequency. For example, determine the amplitude of the component at 20Hz as U1A_PE from the output port voltage of the first converter. Then, obtain the amplitude of the output port voltage signal of the second converter at a specified frequency. For example, determine the amplitude of the component at 20Hz as U2A_PE from the output port voltage of the second converter. Then, compare whether the difference between U1A_PE and U2A_PE exceeds a preset fault threshold. In practical applications of this scheme, other matching relationships may also exist, which are not limited in this embodiment.

[0055] When the bus system contains only a first converter (master) and a second converter (slave), if the output port voltage signal of the first converter and the output port voltage signal of the second converter meet a preset matching relationship, the master controller can determine that the wiring of the first converter and the second converter is correct and execute step 204. If the output port voltage signal of the first converter and the output port voltage signal of the second converter do not meet the preset matching relationship, the master controller can determine that the wiring of the first converter or the second converter is incorrect and execute step 205.

[0056] When the bus system has a first converter (master) and multiple second converters (slave), the master controller can simultaneously determine whether the output port voltage signal of the first converter and the output port voltage signals of the multiple second converters meet a preset matching relationship. If the preset matching relationship is met, it indicates that the first converter and the multiple second converters are connected to the same bus device, confirming that the wiring of the first converter and the multiple second converters is correct, and proceeding to step 204. In some embodiments, if it is determined that the output port voltage signal of the first converter and one of the second converters does not meet the preset matching relationship, it indicates that the first converter and the second converter are not connected to the same bus device, and one of the converters (the first converter or the second converter) must be wired incorrectly. In this case, the master controller can proceed to step 205.

[0057] It is understood that the matching relationship can be a database pre-set in the main controller. When the main controller executes step 203, it can read the relevant matching relationship from the database and perform corresponding calculations and judgments. This embodiment of the application does not limit this.

[0058] 204. Generate the first information;

[0059] When the main controller determines that the output port voltage signal of the first converter and the output port voltage signal of the second converter meet a preset matching relationship, the main controller can generate first information. In this embodiment, the first information is used to indicate that the output ports of the first converter and the output ports of the second converter are connected to the same busbar device.

[0060] It is understandable that when the output port voltage signal of the first converter and the output port voltage signal of the second converter meet the preset matching relationship, it means that the output ports of the first converter and the output ports of the second converter are connected to the same bus device. The main controller can generate the first information and display the first information to the wiring staff or perform further processing based on the first information.

[0061] In this process, the first information displayed to the wiring personnel can be linked by associating the numbers of the first and second converters (e.g., by connecting them with wires, setting them to the same color, etc.). This allows the personnel to determine that the first and second converters are connected to the same combiner device. When the combiner system has a first converter (master) and multiple second converters (slave), the master controller can display the first information of the first converter and each of the second converters individually or jointly, enabling the personnel to confirm that the first converter and the multiple second converters are all connected to the same combiner device and that the wiring of the first converter and the multiple second converters is correct.

[0062] When the main controller performs further processing, it can determine, based on the indication of the first information, that the first converter and the second converter are connected to the same combiner device, and perform the operations that can be performed under that condition. For example, if the main controller can determine that all converters in the combiner system are correctly wired before starting the entire combiner system, then the main controller will only start the entire combiner system after receiving the first information of the first converter and all second converters.

[0063] 205. Generate the second piece of information;

[0064] When the main controller determines that the output port voltage signal of the first converter and the output port voltage signal of the second converter do not meet a preset matching relationship, the main controller can generate second information. In this embodiment, the second information is used to indicate that the output ports of the first converter and the second converter are connected to different bus devices, and to indicate that the wiring of the first converter or the second converter is incorrect.

[0065] It is understandable that when there are only a first converter (master) and a second converter (slave) in the bus system, if it is determined that the output port voltage signal of the first converter and one of the second converters does not meet the preset matching relationship, it means that the first converter and the second converter are not connected to the same bus device, and one of the converters (the first converter or the second converter) must have a wiring error. Then the master controller can generate the second information.

[0066] When a bus system has a first converter (master) and multiple second converters (slave), the master controller can simultaneously determine whether the output port voltage signal of the first converter meets a preset matching relationship with the output port voltage signals of the multiple second converters. If the output port voltage signal of the first converter does not meet the preset matching relationship with one of the second converters, it indicates that the first converter and the second converter are not connected to the same bus device, and one of the converters (either the first converter or the second converter) must have an incorrect wiring. In this case, the master controller can generate a second message.

[0067] After the main controller generates the second information, it can display the second information to the wiring staff or perform further processing based on the second information.

[0068] One way to display the second information to the wiring staff is by contrasting the numbers of the first and second converters (e.g., using different colors, or marking the numbers with checkmarks or crosses). This allows the staff to clearly identify a wiring error in either the first or second converter. Once the staff can determine the wiring error through the displayed second information, they can then inspect that converter. In some cases, when the bus system has a first converter (master) and multiple second converters (slave), the master controller can display the second information for the first converter and a few specific second converters, while displaying the first information for other second converters. In this case, the staff can generally determine that the wiring of those specific second converters is incorrect.

[0069] When the main controller performs further processing, it can determine, based on the indication of the second information, that the first converter and the second converter are not connected to the same combiner device, and then perform the operations that can be performed under this condition. For example, if the main controller determines that a certain second converter in the combiner system is not connected to the same combiner device as the first converter, the main controller can issue an alarm to inform the staff that the second converter is wired incorrectly.

[0070] In some embodiments, if all converters in the bus system are correctly wired, the main controller can generate first information according to the above steps, but will not generate second information (a wiring error would generate second information). Therefore, if the main controller generates first information after performing the above detection method steps on the bus system, then the bus system has no wiring errors.

[0071] In some embodiments, the selected first converter (master) happens to be the only incorrectly wired converter in the bus system. Since this first converter and the other second converters (slave converters) are not connected to the same bus system, the master controller will generate multiple second information messages instead of the first information message. Because most converters are generally correctly wired, in this case, the first converter is likely the incorrectly wired one, while the other second converters are likely correctly wired. Therefore, based on these first and second information messages, staff can focus on checking the wiring of the first converter, quickly identifying the incorrectly wired converter. Alternatively, the master controller can reselect one of these second converters as the new master and re-perform the test.

[0072] Understandably, when there are only two bus systems in the system architecture, if the main controller generates multiple second information messages but no first information message, there are two possibilities. One possibility is that the first converter is incorrectly connected to another bus system, while the other second converters are correctly connected to the current bus system. The other possibility is that the first converter is correctly connected to the current bus system, while the other second converters are incorrectly connected to another bus system. In short, the staff can make a practical judgment based on the above two situations.

[0073] In some embodiments, some second converters in the combiner system are not connected to the same combiner device as the first converter. In such cases, after the main controller executes the above detection method, it can generate several first information entries and several second information entries, and display these entries. After reviewing the first and second information entries, staff can focus their investigation on the converters corresponding to the second information entries to identify those with incorrect wiring.

[0074] In some embodiments, the main controller can directly determine that the converter corresponding to the first information is a correctly wired converter, and the converter corresponding to the second information is a incorrectly wired converter, and issue an alarm to prompt the staff "which converters are incorrectly wired". Specifically, the main controller can display the number of the incorrectly wired converter on the display screen, or it can configure corresponding indicator lights for all converters. If the converter is correctly wired, the indicator light will be green; if the converter is incorrectly wired, the indicator light will be red. In practical applications, the main controller can also perform other forms of display, which are not limited in this embodiment.

[0075] In the embodiments of this application, the aforementioned combiner device may be a combiner distribution cabinet, a split transformer, a combiner box, or other devices used to combine the output of the converter. This application embodiment does not limit this.

[0076] In the embodiments of this application, the converter mentioned above may be a DC-to-DC converter, a DC-to-AC converter, an AC-to-DC converter, etc., and the embodiments of this application do not limit it.

[0077] In this embodiment, the main controller and each converter can communicate wirelessly or via wired communication, so that the main controller can obtain the voltage signal of the output port of each converter.

[0078] Figure 3This is a schematic diagram of a system architecture provided in one application example of this application. In this system architecture, the converter is specifically an inverter, and the DC sides of the inverters are connected in series in pairs. The combiner device is a transformer winding, and low-voltage winding 1 and low-voltage winding 2 are different combiner devices. The communication method between inverters and the communication method between inverters and the main controller is AC power line communication (PLC).

[0079] Figure 3 In the middle, the DC side of the inverter is installed in pairs, such as Figure 3 As shown in inverters 1 and 2, inverter 1 has a DC input of +BUS and 0V, while inverter 2 has a DC input of 0V and -BUS. Since inverters 1 and 2 have DC inputs connected in series, their outputs must be isolated by the two low-voltage windings of a double-split transformer; otherwise, a bus short circuit will occur during operation. Therefore, in this application example, the inverter with a DC input of +BUS and 0V is typically pre-connected to low-voltage winding 1 (hereinafter referred to as: bus system 1), and the inverter with a DC input of 0V and -BUS is pre-connected to low-voltage winding 2 (hereinafter referred to as: bus system 2). Figure 3 The system architecture shown actually includes two bus systems. In bus system 1, the inverter with DC input of +BUS and 0V is connected through low-voltage winding 1. In bus system 2, the inverter with DC input of 0V and -BUS is connected through low-voltage winding 2.

[0080] exist Figure 3 In the diagram, inverters 1 and 3, with DC inputs of +BUS and 0V, should be connected to low-voltage winding 1. Inverters 2 and 4, with DC inputs of 0V and -BUS, should be connected to low-voltage winding 2. However, the current wiring is incorrect; inverter 4 is incorrectly connected to low-voltage winding 1. This will cause a short circuit between BUS+ and BUS- upon startup, resulting in damage. Therefore, it is necessary to accurately identify such wiring errors.

[0081] I. Regarding the combiner system 1:

[0082] Inverter 1 and Inverter 3 are two inverters pre-configured for connection to combiner system 1. Closing the grid-connected relay RA for phase A of inverter 1 activates the phase A bridge arm, controlling the phase A output to produce a sine wave with an amplitude of 50V and a frequency of 20Hz. The inverter typically samples the voltage across the PE phase from its output terminal. After sampling the phase A voltage to the PE phase, the 20Hz component amplitude is calculated and denoted as U1A_PE. This value is used as the disturbance voltage amplitude, and inverter 1 transmits this disturbance voltage amplitude to the main controller. Similarly, the phase A voltage of inverter 3 is detected and processed to obtain the 20Hz component amplitude, denoted as U3A_PE. This value is used as the characteristic voltage amplitude, and inverter 3 transmits this characteristic voltage amplitude to the main controller. After receiving feedback from inverter 1 and inverter 3, the main controller compares the values. If the absolute value of the difference between the characteristic voltage amplitude and the disturbance voltage amplitude is less than the fault threshold, it indicates that inverter 3 and inverter 1 are connected to the same combiner system. If the difference is greater than the fault threshold, it indicates that inverter 1 and inverter 3 are not connected to the same combiner system. Figure 3 It can be seen that inverter 1 and inverter 3 are wired correctly, therefore the voltage difference between them is less than the fault threshold. The fault threshold here is taken as 20V.

[0083] The detection method provided in this application acquires the output port voltage signals of each inverter through the main controller, and determines the inverters with incorrect wiring in the combiner system based on these voltage signals. Specifically, Figure 4 This is a schematic diagram of the detection steps for the bus system 1 in the application example of this application. The detection steps include:

[0084] 401: Set Inverter 1 as the main controller;

[0085] In this application example, the staff can pre-configure inverter 1 as the main controller.

[0086] 402: The main controller selects inverter 1 as the host of combiner system 1;

[0087] In this application example, the master is the first converter mentioned above, and the slave is the second converter mentioned above.

[0088] 403: The main unit of the combiner system is working;

[0089] The main unit of the combiner system 1 controls the grid-connected relay RA to close; in this application example, the closing of the grid-connected relay RA can connect the A-phase line of inverter 1, enabling inverter 1 to work.

[0090] 404: The main controller acquires the disturbance voltage;

[0091] When the inverter A-phase inverter bridge arm is working, it controls the output of the A-phase sine wave with an amplitude of 50V and a frequency of 20Hz. It detects the A-phase PE voltage and calculates the amplitude of the 20Hz component U1A_PE in the voltage. This voltage amplitude is the disturbance voltage amplitude. The host transmits the disturbance voltage amplitude to the main controller.

[0092] 405: The master controller acquires the slave's characteristic voltage;

[0093] In the combiner system 1, the slave device detects the voltage of A relative to PE and calculates the amplitude of the 20Hz component of the voltage, UxA_PE (x is the slave device number in the combiner system 1, for example, the amplitude of the component of inverter 3 is denoted as U3A_PE). This voltage amplitude is the characteristic voltage amplitude, and the slave device transmits the characteristic voltage amplitude to the master controller.

[0094] 406: The main controller determines whether the absolute value of the difference between the characteristic voltage and the disturbance voltage is greater than the fault threshold;

[0095] The main controller receives the characteristic voltage amplitude of all slave devices in the bus system 1 and compares it with the disturbance voltage amplitude. If the absolute value of the difference between the two is greater than the fault threshold, it indicates that there is a wiring error in the bus system 1. The fault threshold is 20V.

[0096] In this application example, the voltage difference between the two is less than the fault threshold, so the main controller can determine that inverter 1 and inverter 3 are wired correctly. In some cases, the main controller can generate and display a first message (to indicate that inverter 1 and inverter 3 are wired correctly), so that the operator can clearly know that inverter 1 and inverter 3 are wired correctly after seeing the first message.

[0097] 407: Busbar system 1 wiring test completed;

[0098] After the wiring test of combiner system 1 is completed, the main controller can issue a shutdown command to the host in combiner system 1, and the host of combiner system 1 will shut down.

[0099] II. Regarding the merging system 2:

[0100] The main controller can also perform the same detection on inverters 2 and 4, which are pre-configured to be connected to the combiner system 2. Specifically, firstly, the grid-connected relay RA of phase A of inverter 2 is closed, and the phase A bridge arm of inverter 2 operates, controlling the phase A output to produce a sine wave with an amplitude of 50V and a frequency of 20Hz. After sampling the phase A voltage to PE, the amplitude of the 20Hz component of the voltage is calculated and denoted as U2A_PE. This value is used as the disturbance voltage amplitude, and inverter 2 transmits the disturbance voltage amplitude to the main controller. Then, the phase A voltage to PE of inverter 4 is detected, and after the same processing, the amplitude of the 20Hz component is obtained and denoted as U4A_PE. This value is used as the characteristic voltage amplitude, and inverter 4 transmits the characteristic voltage amplitude to the main controller. The main controller receives feedback from inverters 2 and 4 and compares them. Figure 3 In the application example, due to the wiring error of inverter 4, the absolute value of the difference between the amplitude of the disturbance voltage from inverter 2 and the amplitude of the characteristic voltage from inverter 4 is greater than the fault threshold. Therefore, the main controller can determine the wiring error and then issue a wiring error alarm.

[0101] Specifically, Figure 5 This is a schematic diagram of the detection steps for the bus system 2 in the application example of this application. The detection steps include:

[0102] 501. The main controller selects inverter 2 as the host of combiner system 2;

[0103] In this application example, Figure 3 In the system architecture, if inverter 1 is pre-selected as the main controller, there is no need to determine the main controller again. Since the inverters can communicate with each other via PLC, the main controller can normally receive the output port voltage signals of inverters 2, inverter 4, etc.

[0104] In this application example, inverter 2 is selected as the master of combiner system 2, and the other inverters in combiner system 2 are slaves.

[0105] 502. The main unit of the combiner system is working;

[0106] In this application example, the main unit of the combiner system 2 controls the grid connection relay RA to close.

[0107] 503. The main controller acquires the disturbance voltage;

[0108] When the inverter's A-phase inverter bridge arm is operating, it controls the output of a sine wave with an amplitude of 50V and a frequency of 20Hz. The main unit detects the voltage of A-phase to PE and calculates the amplitude of the 20Hz component U2A_PE in the voltage. This voltage amplitude is the disturbance voltage amplitude, and the main unit transmits the disturbance voltage amplitude to the main controller.

[0109] 504. The main controller acquires the characteristic voltage of the slave device;

[0110] In the combiner system 2, the slave device detects the voltage of A relative to PE and calculates the amplitude of the 20Hz component of the voltage, UyA_PE (y is the slave device number in the combiner system 2, for example, the amplitude of the component of inverter 4 is denoted as U4A_PE). This voltage amplitude is the characteristic voltage amplitude, and the slave device transmits the characteristic voltage amplitude to the master controller.

[0111] 505. The main controller determines whether the absolute value of the difference between the characteristic voltage and the disturbance voltage is greater than the fault threshold;

[0112] The main controller receives the characteristic voltage amplitude of all slave devices in the bus system 2 and compares it with the disturbance voltage amplitude. If the absolute value of the difference between the two is greater than the fault threshold, it indicates that there is a wiring error in the bus system 2. The fault threshold is 20V.

[0113] In this application example, the absolute value of the difference between the disturbance voltage amplitude from inverter 2 and the characteristic voltage amplitude from inverter 4 is greater than the fault threshold. Therefore, the main controller can determine a wiring error and issue a wiring error alarm. Operators can... Figure 3 Before starting the system architecture shown, check for any alarm messages. If any alarm messages are found, perform a wiring check first. In some cases, staff can also use the alarm messages to specifically investigate wiring errors in inverters 2 and 4.

[0114] 506. Busbar system 2 wiring test completed.

[0115] After the wiring test of combiner system 2 is completed, the main controller sends a shutdown command to the host in combiner system 2, and the host of combiner system 2 shuts down.

[0116] At this point, Figure 3 The system wiring error detection shown has been completed.

[0117] As can be seen from the above embodiments and application examples, the detection solution provided in this application has the following advantages:

[0118] 1. The wiring error detection solution is applicable to different types of busbar devices;

[0119] --Reason: By injecting disturbance voltage as a detection signal through the host, the downstream devices of the bus system do not need to be powered on; for multiple bus systems with coupling, the disturbance voltage can be injected in a time-division manner and detected separately.

[0120] 2. The wiring error detection scheme does not require information from the combiner point of the combiner device, making the detection scheme simple. -- Reason: The wiring detection criteria only rely on the port voltage information of each converter. The voltage information can be uploaded to the main controller using only the existing hardware circuit of the inverter. It does not require information from the combiner point of the combiner device, thus avoiding the complex design caused by detecting combiner point information.

[0121] Figure 6 This is a schematic diagram of a detection device provided in an embodiment of this application. The detection device 600 includes:

[0122] Module 601 is used to perform the above. Figure 2 Steps 201 and 202 in the corresponding embodiments;

[0123] Processing module 602 is used to perform the above. Figure 2 Steps 203, 204, and 205 in the corresponding embodiments.

[0124] Figure 7 This is a schematic diagram of the architecture of a main controller provided in an embodiment of this application. The main controller 700 includes one or more processors 701, a memory 703, and a communication interface 704. The processors 701, memory 703, and communication interface 704 can be connected via a communication bus 702. The memory 703 is used to store one or more programs; the one or more processors 701 are used to run the one or more programs, causing the main controller 700 to execute the methods corresponding to the above-described method embodiments.

[0125] The processor 701 can be a general-purpose central processing unit (CPU), a network processor (NP), a microprocessor, or one or more integrated circuits for implementing the solutions of this application, such as an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The aforementioned PLD can be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL), or any combination thereof.

[0126] The communication bus 702 is used to transmit information between the aforementioned components. The communication bus 702 can be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, see attached... Figure 7 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0127] The memory 703 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions; it may also be a random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions; it may also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media, or other magnetic storage devices; or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited thereto. The memory 703 may exist independently and be connected to the processor 701 via a communication bus 702. The memory 703 may also be integrated with the processor 701.

[0128] Communication interface 704 uses any transceiver-like device for communicating with other devices or communication networks. Communication interface 704 includes a wired communication interface and may also include a wireless communication interface. The wired communication interface may, for example, be an Ethernet interface. The Ethernet interface may be an optical interface, an electrical interface, or a combination thereof. The wireless communication interface may be a wireless local area network (WLAN) interface, a cellular network communication interface, or a combination thereof.

[0129] In a specific implementation, as one embodiment, the processor 701 may include one or more CPUs, as shown in the appendix. Figure 7 CPU0 and CPU1 are shown in the diagram.

[0130] In a specific implementation, as one example, the main controller 700 may include multiple processors, as shown in the attached diagram. Figure 7 The processors 701 and 705 are shown. Each of these processors can be a single-core processor or a multi-core processor. Here, "processor" can refer to one or more devices, circuits, and / or processing cores used to process data (such as computer program instructions).

[0131] In a specific implementation, as one embodiment, the main controller 700 may further include output devices and input devices. The output devices communicate with the processor 701 and can display information in various ways. For example, the output devices may be liquid crystal displays (LCDs), light-emitting diode (LED) displays, cathode ray tube (CRT) displays, or projectors. The input devices communicate with the processor 701 and can receive user input in various ways. For example, the input devices may be mice, keyboards, touchscreen devices, or sensing devices.

[0132] In some embodiments, memory 703 is used to store program code 710 for executing the scheme of this application, and processor 701 can execute the program code 710 stored in memory 703. That is, main controller 700 can implement the detection method provided in the method embodiment through processor 701 and program code 710 in memory 703.

[0133] The main controller 700 in this application embodiment can correspond to the main controller in the above-described method embodiments. Furthermore, the processor 701, communication interface 704, etc., in the main controller 700 can implement the functions and / or various steps and methods implemented by the main controller in the above-described method embodiments. For the sake of brevity, further details are omitted here.

Claims

1. A detection method, characterized in that, include: When the first converter is working and the second converter is not working, the main controller acquires the output port voltage signal of the first converter; The main controller acquires the output port voltage signal of the second converter; If the output port voltage signal of the first converter and the output port voltage signal of the second converter satisfy a preset matching relationship, the main controller generates first information, which indicates that the output port of the first converter and the output port of the second converter are connected to the same bus device. If the output port voltage signal of the first converter and the output port voltage signal of the second converter do not meet the preset matching relationship, the main controller generates second information. The second information is used to indicate that the output port of the first converter and the output port of the second converter are connected to different bus devices, and to indicate that the wiring of the first converter or the wiring of the second converter is incorrect.

2. The method according to claim 1, characterized in that, Before the main controller instructs the first converter to start operating, the method further includes: The main controller determines the first converter from a plurality of converters in the bus system according to an input instruction. The bus system includes the first converter, the second converter, and a bus device for busing the plurality of converters.

3. The method according to claim 2, characterized in that, The busbar device for the multiple converters is either a busbar distribution cabinet or a split transformer.

4. The method according to any one of claims 1 to 3, characterized in that, The voltage signal is one of a DC signal, an AC signal, or a preset waveform signal.

5. The method according to any one of claims 1 to 4, characterized in that, The converter is one of the following: a DC-to-DC converter, a DC-to-AC converter, or an AC-to-DC converter.

6. The method according to any one of claims 1 to 5, characterized in that, The main controller communicates with the first converter and the second converter via wireless signals or wired communication.

7. The method according to any one of claims 1 to 6, characterized in that, The matching relationship can be one of amplitude relationship, phase relationship or frequency relationship.

8. The method according to any one of claims 1 to 7, characterized in that, The preset matching relationship between the output port voltage signal of the first converter and the output port voltage signal of the second converter specifically includes: The difference between the output port voltage amplitude of the first converter and the output port voltage amplitude of the second converter is less than a preset fault threshold; The fact that the output port voltage signal of the first converter and the output port voltage signal of the second converter do not meet the preset matching relationship specifically includes: The difference between the output port voltage amplitude of the first converter and the output port voltage amplitude of the second converter is not less than a preset fault threshold.

9. A main controller, characterized in that, Includes processor, memory, and communication interface; The memory stores computer programs; The communication interface is used to communicate with the converter; The processor is used to execute the computer program stored in the memory, causing the main controller to implement the method according to any one of claims 1 to 8.

10. A detection device, characterized in that, The device includes: The acquisition module is used to acquire the output port voltage signal of the first converter and the output port voltage signal of the second converter when the second converter is not working and the first converter is working. The processing module is used to generate first information when the output port voltage signal of the first converter and the output port voltage signal of the second converter meet a preset matching relationship. The first information is used to indicate that the output port of the first converter and the output port of the second converter are connected to the same bus device. The processing module is further configured to generate second information when the output port voltage signal of the first converter and the output port voltage signal of the second converter do not meet a preset matching relationship. The second information is used to indicate that the output port of the first converter and the output port of the second converter are connected to different bus devices, and to indicate that the wiring of the first converter or the wiring of the second converter is incorrect.

11. The apparatus according to claim 10, characterized in that, The processing module is also used for: The first converter is determined from a plurality of converters in a bus system according to an input instruction. The bus system includes the first converter, the second converter, and a bus device for busing the plurality of converters.

12. The apparatus according to claim 11, characterized in that, The busbar device for the multiple converters is either a busbar distribution cabinet or a split transformer.

13. The apparatus according to any one of claims 10 to 12, characterized in that, The voltage signal is one of a DC signal, an AC signal, or a preset waveform signal.

14. The apparatus according to any one of claims 10 to 13, characterized in that, The converter is one of the following: a DC-to-DC converter, a DC-to-AC converter, or an AC-to-DC converter.

15. The apparatus according to any one of claims 10 to 14, characterized in that, The communication interface communicates with the first converter and the second converter via wireless signals or wired communication.

16. The apparatus according to any one of claims 10 to 15, characterized in that, The matching relationship can be one of amplitude relationship, phase relationship or frequency relationship.

17. The apparatus according to any one of claims 10 to 16, characterized in that, The preset matching relationship between the output port voltage signal of the first converter and the output port voltage signal of the second converter specifically includes: The difference between the output port voltage amplitude of the first converter and the output port voltage amplitude of the second converter is less than a preset fault threshold; The fact that the output port voltage signal of the first converter and the output port voltage signal of the second converter do not meet the preset matching relationship specifically includes: The difference between the output port voltage amplitude of the first converter and the output port voltage amplitude of the second converter is not less than a preset fault threshold.

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