Power line inspection method and inspection device

Abstract

The invention discloses a power line inspection method and device for a converter device and a power line inspection method and device for a converter system. The checking method comprises the steps of performing power scheduling on a first converter, and obtaining first operation power of the first converter after power scheduling; obtaining the output power of an energy storage unit corresponding to the first converter; and determining a connection state of a power line connected with the first converter according to the first operation power and the output power. According to the checking method, power scheduling is conducted on the converters, the first operation power is made to be different from the second operation power, then whether the power line connected with the first converter is abnormal or not is determined, and therefore the abnormity of the power line can be effectively checked.

Description

Technical Field

[0001] This application relates to the field of converter technology, and more specifically, to a method and apparatus for inspecting the power lines of a converter device and a method and apparatus for inspecting the power lines of a converter system. Background Technology

[0002] A power conversion system consists of energy storage units and converters. The energy storage units and converters are connected via power lines to transfer electrical energy from the energy storage units to the converters. Ensuring the correct power line connection between each converter and its corresponding energy storage unit is crucial for the normal operation of the system. Therefore, determining how to check for abnormal power line connections is an urgent problem to be solved. Summary of the Invention

[0003] This application provides a method and apparatus for inspecting the power lines of a converter device, and a method and apparatus for inspecting the power lines of a converter system.

[0004] This application provides a method for inspecting the power line of a converter device. The converter device includes multiple converters, and each converter corresponds to a multiple energy storage unit. Each converter includes a first converter, which can be any one of the converters in the converter device. The input terminals of the multiple converters are all connected to the energy storage unit through power lines, and the output terminals of the multiple converters are connected in parallel.

[0005] The inspection method includes:

[0006] Power scheduling is performed on the first converter to obtain the first operating power of the first converter after power scheduling;

[0007] Obtain the output power of the energy storage unit corresponding to the first converter;

[0008] The connection status of the power line connected to the first converter is determined based on the first operating power and the output power.

[0009] Thus, power scheduling of the converters allows the operating power of the first converter to differ from the second operating power of the second converter. By acquiring and using the first operating power and the output power of the energy storage unit connected to the first converter, it can be determined whether there are any abnormalities in the power line connected to the first converter, thereby enabling effective inspection of power line abnormalities. The inspection method of this application improves the accuracy of power line inspection during the operation of the system converter, reduces system maintenance costs, and also facilitates timely detection of power line problems caused by aging, misoperation, etc., thereby improving the safety and stability of the system.

[0010] In some embodiments, the power dispatching of the first converter includes:

[0011] After the energy storage units in the converter are balanced, the first initial power of the first converter and the second initial power of each second converter before power scheduling are obtained. The second converter is any converter in the converter other than the first converter.

[0012] The first converter is power-scheduled based on the first initial power and the second initial power, so that the first operating power of the first converter is different from the second operating power of the second converter, and the sum of the power of all the converters after power scheduling is the same as the sum of the initial power of all the converters.

[0013] Thus, even with the energy storage unit having a power balancing function, power dispatch can differentiate between the first and second operating power, enabling power line detection. Simultaneously, ensuring that the power of all converters remains constant before and after power dispatch guarantees the stability of the converter's output during operation, ensuring that power line inspection does not affect the converter's power supply to the load during operation.

[0014] In some embodiments, the power dispatching of the first converter based on the first initial power and the second initial power includes:

[0015] If the second initial power is greater than the preset scheduling power, and the sum of the first initial power and the total scheduling power is less than or equal to the target threshold, the first converter is power-scheduled according to the preset scheduling power and the total scheduling power. The total scheduling power is the product of the preset scheduling power and the target number, and the target number is the number of the second converter.

[0016] Thus, by comparing the second initial power with the preset scheduling power, and comparing the target threshold with the sum of the first initial power and the total scheduling power, power scheduling can only be performed if the sum of the first initial power and the total scheduling power is less than the target threshold. This is to avoid the first converter being damaged due to excessive power after power scheduling, and to prevent the second converter from failing to work after scheduling.

[0017] In some embodiments, the step of power dispatching the first converter according to the preset dispatch power and the total dispatch power includes:

[0018] The first converter is controlled to operate based on the sum of the first initial power and the total scheduled power.

[0019] The second converter is controlled to operate based on the difference between the second initial power and the preset scheduling power.

[0020] Thus, if it is determined that the second initial power is sufficient to be allocated to the first converter, the sum of the first initial power and the total dispatch power is assigned to the first operating power, and the difference between the second initial power and the preset dispatch power is assigned to the second operating power, so that the first operating power after dispatch is different from the second operating power, and the total power of the converter remains unchanged before and after dispatch.

[0021] In some embodiments, the power dispatching of the first converter based on the first initial power and the second initial power includes:

[0022] When the first initial power is greater than the total dispatch power, and the sum of the second initial power and the preset dispatch power is less than or equal to the target threshold, the first converter is power-dispatched according to the preset dispatch power and the total dispatch power. The total dispatch power is the product of the preset dispatch power and the target number, and the target number is the number of the second converters.

[0023] Thus, by comparing the first initial power with the total scheduled power, and comparing the target threshold with the sum of the second initial power and the preset scheduled power, power scheduling can only be performed if the first initial power is greater than the total scheduled power, and the sum of the other second initial powers and the preset scheduled power is less than or equal to the target threshold. This is to avoid the second converter being damaged due to excessive power after power scheduling, and to prevent the first converter from becoming inoperable after scheduling.

[0024] In some embodiments, the step of power dispatching the first converter according to the preset dispatch power and the total dispatch power includes:

[0025] The first converter is controlled to operate based on the difference between the initial power and the total scheduled power.

[0026] The second converter is controlled to operate based on the sum of the second initial power of the converter and the preset scheduling power.

[0027] Thus, if it is determined that the first initial power is sufficient to be allocated to the second converter, the difference between the first initial power and the total dispatch power is assigned to the first operating power, and the sum of the second initial power and the preset dispatch power is assigned to the second operating power, so that the first operating power after dispatch is different from the second operating power, and the total power of the converter remains unchanged before and after dispatch.

[0028] In some embodiments, the inspection method further includes:

[0029] If neither the first preset condition nor the second preset condition is met, the inspection of the power line is stopped. The first preset condition is: the second initial power is greater than the preset scheduling power, and the sum of the first initial power and the total scheduling power is less than or equal to the target threshold. The second preset condition is: the first initial power is greater than the total scheduling power, and the sum of the second initial power and the preset scheduling power is less than or equal to the target threshold.

[0030] Thus, if the conditions for power dispatch are not met, the initial power of the converter is insufficient to support power dispatch, or the converter will be unable to work properly after dispatch due to excessive power. Therefore, the inspection of the power line is stopped.

[0031] In some embodiments, the inspection method further includes:

[0032] The target threshold is determined based on the maximum charge / discharge power of the converter and the maximum charge / discharge power of the energy storage unit.

[0033] Thus, by determining the target threshold based on the maximum charge / discharge power of the converter and the maximum charge / discharge power of the energy storage unit connected to the converter, damage to the converter caused by excessive power after power dispatch can be avoided.

[0034] In some embodiments, determining the connection state of the power line connected to the first converter based on the first operating power and the output power of the energy storage unit includes:

[0035] If the difference between the first operating power and the output power of the energy storage unit is greater than or equal to a set difference, it is determined that the power line connection of the first converter is abnormal.

[0036] If the difference between the first operating power and the output power of the energy storage unit is less than a set difference, it is determined that the power line connected to the first converter is correctly connected.

[0037] Thus, based on the comparison between the difference between the first operating power and the output power of the energy storage unit and the set difference, the connection status of the power line of the first converter can be determined.

[0038] In some embodiments, the inspection method further includes:

[0039] If there are no abnormalities in any of the power lines connected to the converter, control the converter to operate according to the initial power of the converter, and stop checking the power lines.

[0040] Thus, having confirmed that there are no abnormalities in the power lines connected to all converters, the inspection of the power lines has been completed, and therefore the inspection is stopped. At this point, the energy storage power of the converter is used as the operating power to restore the converter to the operating state after the energy storage unit's equalization process, thereby restoring the normal operation of the converter unit.

[0041] This application provides a power line inspection unit for a converter device. The converter device includes multiple converters, and each converter corresponds to a multiple energy storage unit. Each converter includes a first converter, which can be any one of the converters in the converter device. The input terminals of the multiple converters are all connected to the energy storage units through power lines, and the output terminals of the multiple converters are connected in parallel.

[0042] The inspection unit includes:

[0043] The first power scheduling module is used to perform power scheduling on the first converter and obtain the first operating power of the first converter after power scheduling.

[0044] The first power acquisition module is used to acquire the output power of the energy storage unit corresponding to the first converter.

[0045] The first state determination module is used to determine the connection state of the power line connected to the first converter based on the first operating power and the output power.

[0046] Thus, power scheduling of the converters allows the operating power of the first converter to differ from the second operating power of the second converter. By acquiring and using the first operating power and the output power of the energy storage unit connected to the first converter, it can be determined whether there are any abnormalities in the power line connected to the first converter, thereby enabling effective inspection of power line abnormalities. The inspection method of this application improves the accuracy of power line inspection during the operation of the system converter, reduces system maintenance costs, and also facilitates timely detection of power line problems caused by aging, misoperation, etc., thereby improving the safety and stability of the system.

[0047] In some embodiments, the first power scheduling module includes:

[0048] The acquisition submodule is used to acquire the first initial power of the first converter and the second initial power of each second converter before power scheduling after the energy storage units in the converter are balanced. The second converter is any converter in the converter other than the first converter.

[0049] The scheduling submodule is used to perform power scheduling on the first converter according to the first initial power and the second initial power, so that the first operating power of the first converter is different from the second operating power of the second converter, and the sum of the power of all the converters after power scheduling is the same as the sum of the initial power of all the converters.

[0050] In some implementations, the scheduling submodule includes:

[0051] The first scheduling unit is configured to perform power scheduling on the first converter according to the preset scheduling power and the total scheduling power when the second initial power is greater than the preset scheduling power and the sum of the first initial power and the total scheduling power is less than or equal to the target threshold. The total scheduling power is the product of the preset scheduling power and the target number, and the target number is the number of the second converter.

[0052] In some implementations, the scheduling submodule includes:

[0053] The second scheduling unit is used to perform power scheduling on the first converter according to the preset scheduling power and the total scheduling power when the first initial power is greater than the total scheduling power and the sum of the second initial power and the preset scheduling power is less than or equal to the target threshold. The total scheduling power is the product of the preset scheduling power and the target number, and the target number is the number of the second converter.

[0054] In some embodiments, the inspection unit further includes:

[0055] A stop module is used to stop the inspection of the power line if neither a first preset condition nor a second preset condition is met. The first preset condition is that the second initial power is greater than the preset scheduling power, and the sum of the first initial power and the total scheduling power is less than or equal to a target threshold. The second preset condition is that the first initial power is greater than the total scheduling power, and the sum of the second initial power and the preset scheduling power is less than or equal to the target threshold.

[0056] In some implementations, the first state determination module includes:

[0057] The first determining submodule is used to determine that the power line connection of the first converter is abnormal when the difference between the first operating power and the output power of the energy storage unit is greater than or equal to a set difference.

[0058] The second determining submodule is used to determine that the power line connection of the first converter is correct when the difference between the first operating power and the output power of the energy storage unit is less than a set difference.

[0059] In some embodiments, the inspection unit further includes:

[0060] The control module is used to control the converter to operate based on the initial power of the converter and stop the inspection of the power lines when there are no abnormalities in the power lines connected to all the converters.

[0061] This application provides a method for inspecting the power line of a converter system. The converter system includes multiple converters and multiple energy storage units, with each converter and energy storage unit corresponding to one another. Each converter includes a first converter, which can be any one of the converters in the converter system. The input terminals of the multiple converters are all connected to the energy storage units through power lines, and the output terminals of the multiple converters are connected in parallel.

[0062] The inspection method includes:

[0063] Power scheduling is performed on the first converter to obtain the first operating power of the first converter after power scheduling;

[0064] Obtain the output power of the energy storage unit corresponding to the first converter;

[0065] The connection status of the power line connected to the first converter is determined based on the first operating power and the output power.

[0066] Thus, power scheduling of the converters allows the operating power of the first converter to differ from the second operating power of the second converter. By acquiring and using the first operating power and the output power of the energy storage unit connected to the first converter, it can be determined whether there are any abnormalities in the power line connected to the first converter, thereby enabling effective inspection of power line abnormalities. The inspection method of this application improves the accuracy of power line inspection during the operation of the system converter, reduces system maintenance costs, and also facilitates timely detection of power line problems caused by aging, misoperation, etc., thereby improving the safety and stability of the system.

[0067] This application provides a power line inspection device for a converter system. The converter system includes multiple converters and multiple energy storage units, with each converter and energy storage unit corresponding to one another. Each converter includes a first converter, which can be any one of the converters in the converter system. The input terminals of the multiple converters are all connected to the energy storage units via power lines, and the output terminals of the multiple converters are connected in parallel.

[0068] The inspection device includes:

[0069] The second power scheduling module is used to perform power scheduling on the first converter and obtain the first operating power of the first converter after power scheduling.

[0070] The second power acquisition module is used to acquire the output power of the energy storage unit corresponding to the first converter.

[0071] The second state determination module is used to determine the connection state of the power line connected to the first converter based on the first operating power and the output power.

[0072] Thus, power scheduling of the converters allows the operating power of the first converter to differ from the second operating power of the second converter. By acquiring and using the first operating power and the output power of the energy storage unit connected to the first converter, it can be determined whether there are any abnormalities in the power line connected to the first converter, thereby enabling effective inspection of power line abnormalities. The inspection method of this application improves the accuracy of power line inspection during the operation of the system converter, reduces system maintenance costs, and also facilitates timely detection of power line problems caused by aging, misoperation, etc., thereby improving the safety and stability of the system.

[0073] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0074] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0075] Figure 1 This is one of the flowcharts illustrating the inspection method of certain embodiments of this application;

[0076] Figure 2 This is one of the schematic diagrams of a converter device according to certain embodiments of this application;

[0077] Figure 3 This is a second schematic diagram of a converter device according to certain embodiments of this application;

[0078] Figure 4 This is a second flowchart illustrating the inspection method of certain embodiments of this application;

[0079] Figure 5 This is the third flowchart illustrating the inspection method of some embodiments of this application;

[0080] Figure 6 This is the fourth flowchart illustrating the inspection method of some embodiments of this application;

[0081] Figure 7 This is the fifth flowchart illustrating the inspection method of certain embodiments of this application;

[0082] Figure 8 This is a flowchart of the inspection method of some embodiments of this application, number six;

[0083] Figure 9 This is the seventh flowchart illustrating the inspection method of some embodiments of this application;

[0084] Figure 10 This is the eighth flowchart illustrating the inspection method of some embodiments of this application;

[0085] Figure 11 This is the ninth flowchart illustrating the inspection method of certain embodiments of this application;

[0086] Figure 12 This is the tenth flowchart illustrating the inspection method of certain embodiments of this application;

[0087] Figure 13 This is eleventh of the flowcharts illustrating the inspection method of certain embodiments of this application. Detailed Implementation

[0088] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0089] A power conversion system consists of energy storage units and converters. The energy storage units and converters are connected via power lines to transfer electrical energy from the energy storage units to the converters. Ensuring the correct power line connection between each converter and its corresponding energy storage unit is crucial for the normal operation of the system. Therefore, determining how to check for abnormal power line connections is an urgent problem to be solved.

[0090] Based on the above-mentioned issues that need to be resolved, please refer to Figure 1 and Figure 2This application provides a method for inspecting the power line 30 of a converter device 100. The converter device 100 includes multiple converters 10, each corresponding to a multiple energy storage unit 300. Each converter 10 includes a first converter, which can be any one of the converters 10 in the converter device 100. The input terminals of the multiple converters 10 are all connected to the energy storage unit 300 via the power line 30, and the output terminals of the multiple converters 10 are connected in parallel. The inspection method includes:

[0091] Step 011: Perform power scheduling on the first converter and obtain the first operating power of the first converter after power scheduling;

[0092] Step 012: Obtain the output power of the energy storage unit 300 corresponding to the first converter;

[0093] Step 013: Determine the connection status of the power line 30 connected to the first converter based on the first operating power and output power.

[0094] This application provides a computer device, which includes one or more processors and a memory. The memory stores a computer program that can be executed by the processor. The processor can be used to: perform power scheduling on a first converter to obtain a first operating power of the first converter after power scheduling; obtain the output power of the energy storage unit 300 corresponding to the first converter; and determine the connection state of the power line 30 connected to the first converter based on the first operating power and the output power.

[0095] This application provides a power line 30 inspection unit for a converter device 100. The inspection unit includes a first power scheduling module, a first power acquisition module, and a first state determination module. The first power scheduling module performs power scheduling on a first converter to acquire a first operating power of the first converter after power scheduling. The first power acquisition module acquires the output power of the energy storage unit 300 corresponding to the first converter. The first state determination module determines the connection state of the power line 30 connected to the first converter based on the first operating power and the output power.

[0096] Specifically, in related technologies, the local controller 50 can check the connection status of the power line 30 during the operation of the converter 100. However, since most converters 100 have the ability to balance the state of charge of the energy storage units 300, the state of charge of multiple energy storage units 300 tends to be balanced. To adapt to the operation of the energy storage units 300, the local controller 50 allocates approximately equal power to the converters 10 connected to the energy storage units 300. Since the power of multiple energy storage units 300 is similar, and the power of multiple converters 10 is also similar, it is impossible to determine whether the power line 30 is connected incorrectly based on the output of the energy storage units 300 and the output of the converters 10 connected to the power line 30.

[0097] This embodiment of the application schedules the power of the converter 10 so that the operating power of one converter 10 differs from that of the other converters 10, thereby causing the output power of the energy storage unit 300 connected to it via the power line 30 to differ from the output power of the other energy storage units 300. At this time, by detecting the power of the corresponding converter 10 and energy storage unit 300, it is possible to determine whether the power line 30 connection between the converter 10 and the energy storage unit 300 is correct. It should be noted that this embodiment of the application can be used not only to check the power line 30 connection of the converter 10 connected to the energy storage unit 300 after equalization, but also to check the converter 10 connected to the energy storage unit 300 that has not been equalized.

[0098] The energy storage unit 300 includes photovoltaic cells and energy storage batteries. Multiple cells can form a battery cluster. Each cell is connected to a corresponding converter 10. In one embodiment, the converter 10 includes a power conversion system (PCS), and each energy storage unit 300 is connected to a corresponding power conversion system. The first converter is the converter 10 that is currently being used for power dispatching.

[0099] The outputs of multiple converters 10 are connected in parallel to the subsequent circuit. The power of the converter 10 can be either the DC side power or the AC side power. The output power of the energy storage unit 300 can be either the power during discharge or the power during charging. The first operating power is the power of the first converter after power regulation, and the second operating power is the power of the second converter after power regulation. Power regulation can be controlled by the local controller 50 of the converter device 100.

[0100] When the power allocated to converter 10 changes, the power of energy storage unit 300 connected to converter 10 via power line 30 also changes synchronously. Therefore, when power dispatch is performed for inspection of power line 30, the balancing of the state of charge of energy storage unit 300 is temporarily suspended to avoid affecting the inspection of power line 30. After power dispatch, the first operating power and the second operating power are different, and the power of energy storage unit 300 that should be connected to the first converter is also different from the power of other energy storage units 300.

[0101] If the power line 30 is connected correctly, the first operating power detected at this time should match the output power of the energy storage unit 300 connected to the first converter.

[0102] If the power line 30 is connected incorrectly, the output power of the energy storage unit 300, which should be connected to the first converter, is not affected by the first converter, that is, it does not change synchronously with the power of the first converter. At this time, the first operating power does not match the output power of the energy storage unit 300 that should be connected to the first converter.

[0103] Therefore, based on the first operating power of the first converter and the output power of the energy storage unit 300 that should be connected to the first converter, it can be determined whether the power line 30 connected to the first converter is connected correctly.

[0104] In one embodiment, see Figure 3 The converter 100 includes energy storage battery B1, energy storage battery B2, energy storage converter PCS1, and energy storage converter PCS2. When the power line 30 is correctly connected, energy storage battery B1 is connected to energy storage converter PCS1, and energy storage battery B2 is connected to energy storage converter PCS2. PCS1 is used as the first converter for power dispatching. After power dispatching of the energy storage converter 10, the power of PCS1 and the power of PCS2 are different, so that the power of energy storage battery B1 should also be different from the power of energy storage battery B2. At this time, the first operating power Pp1 of PCS1 and the output power Pb1 of the energy storage unit 300 of energy storage battery B1 are obtained. If the first operating power and the output power Pb1 of the energy storage unit 300 do not match, it is determined that the connection of the power line 30 connecting energy storage battery B1 and PCS1 is abnormal.

[0105] Thus, power scheduling of converter 10 allows the operating power of the first converter to differ from the second operating power of the second converter. By acquiring and using the first operating power and the output power of the energy storage unit 300 connected to the first converter, it can be determined whether there is an abnormality in the power line 30 connected to the first converter, thereby enabling effective inspection of any abnormalities in the power line 30. The inspection method of this application improves the accuracy of power line 30 inspection during the operation of the system converter 100, reduces system maintenance costs, and also facilitates timely detection of power line 30 problems caused by aging, misoperation, etc., thereby improving the safety and stability of the system.

[0106] Please see Figure 4 In some implementations, step 011, power dispatching of the first converter, includes:

[0107] 0111: After the energy storage units 300 in the converter device 100 are balanced, the first initial power of the first converter and the second initial power of each second converter before power scheduling are obtained. The second converter is any converter 10 in the converter device 100 other than the first converter.

[0108] 0112: Power scheduling is performed on the first converter according to the first initial power and the second initial power, so that the first operating power of the first converter is different from the second operating power of the second converter, and the sum of the power of all converters 10 after power scheduling is the same as the sum of the initial power of all converters 10.

[0109] In some embodiments, the processor can be used to obtain, after equalization of the energy storage units 300 in the converter 100, the first initial power of the first converter and the second initial power of each second converter before power scheduling, wherein the second converter is any converter 10 in the converter 100 other than the first converter; and to perform power scheduling on the first converter according to the first initial power and the second initial power, so that the first operating power of the first converter is different from the second operating power of the second converter, and the sum of the power of all converters 10 after power scheduling is the same as the sum of the initial power of all converters 10.

[0110] In some embodiments, the first power dispatching module includes an acquisition submodule and a dispatching submodule. The acquisition submodule is used to acquire the first initial power of the first converter and the second initial power of each second converter before power dispatching after the energy storage units 300 in the converter device 100 are balanced. The second converter is any converter 10 in the converter device 100 other than the first converter. The dispatching submodule is used to perform power dispatching on the first converter according to the first initial power and the second initial power, so that the first operating power of the first converter is different from the second operating power of the second converter, and the sum of the power of all converters 10 after power dispatching is the same as the sum of the initial power of all converters 10.

[0111] Specifically, the second energy storage converter is any energy storage converter other than the first energy storage converter. For example, the converter 100 includes PCS1, PCS2, PCS3, and PCS4. If PCS1 is the first energy storage converter, then the second energy storage converters are PCS2, PCS3, and PCS4. Alternatively, the converter 100 may include PCS1 and PCS2. If PCS2 is the first energy storage converter, then the second energy storage converter is PCS1.

[0112] The first initial power is the power sent to the first converter by the local controller 50 after equalization, and the second initial power is the power sent to each second converter by the local controller 50 after equalization. Power scheduling of the first converter based on the first and second initial powers ensures that the sum of the operating power of all converters 10 after power scheduling is the same as the sum of the initial power of all converters 10 before power scheduling. It should be noted that the second initial power may be different for different second converters.

[0113] The sum of the power of all converters 10 after power scheduling is the sum of the first operating power and all second operating power; the sum of the power of all converters 10 before power scheduling is the sum of the first initial power and all second initial power.

[0114] In one embodiment, the number of converters 10 is n, where n is a positive integer greater than or equal to 1. One of the converters 10 is the first converter, and the remaining converters 10 are the second converters. After equalization, the first initial power and the second initial power are both p, so the sum of the initial powers is n×p. After power scheduling, the first operating power is p+a×(n-1), and the second initial power is pa. Therefore, the sum of the operating powers after power scheduling is p+a×(n-1)+(n-1)×(pa)=n×p, that is, the sum of the initial powers before power scheduling is the same as the sum of the operating powers before and after power scheduling.

[0115] Thus, even when the energy storage unit 300 has a power balancing function, power scheduling can make the first operating power and the second operating power different, enabling the detection of the power line 30. At the same time, ensuring that the power of all converters 10 remains unchanged before and after power scheduling guarantees the stability of the output of the converter device 100 during operation, so that the inspection of the power line 30 will not affect the power supply of the converter device 100 to the load during operation.

[0116] Please see Figure 5 In some embodiments, step 0112, which involves power scheduling of the first converter based on the first initial power and the second initial power, includes:

[0117] Step 01121: When the second initial power is greater than the preset scheduling power, and the sum of the first initial power and the total scheduling power is less than or equal to the target threshold, the first converter is power-scheduled according to the preset scheduling power and the total scheduling power. The total scheduling power is the product of the preset scheduling power and the target number, and the target number is the number of second converters.

[0118] In some implementations, the processor can be used to perform power scheduling on the first converter based on the preset scheduling power and the total scheduling power when the second initial power is greater than the preset scheduling power and the sum of the first initial power and the total scheduling power is determined to be less than or equal to a target threshold.

[0119] In some implementations, the scheduling submodule includes a first scheduling unit. The first scheduling unit is used to perform power scheduling on the first converter according to the preset scheduling power and the total scheduling power when the second initial power is greater than the preset scheduling power and the sum of the first initial power and the total scheduling power is determined to be less than or equal to a target threshold. The total scheduling power is the product of the preset scheduling power and the target number, where the target number is the number of second converters.

[0120] Specifically, in order to avoid the converter 10 from failing to work properly after power dispatch, it is necessary to determine whether the first initial power or the second initial power is sufficient for power dispatch before power dispatch is performed.

[0121] To ensure that the total power of all converters 10 remains unchanged before and after scheduling, the power of multiple converters 10 can be mutually scheduled in a "shifting" manner. That is, a portion of the power from the second converter can be scheduled to the first converter, so that the first operating power of the first converter is greater than the second operating power of each of the second converters.

[0122] The preset scheduling power 'a' can be a pre-set positive power value, which can be set according to actual needs. The total scheduling power is the product of the preset scheduling power 'a' and the target quantity.

[0123] The target threshold can be the maximum charging / discharging power that the converter 10 can support, or the maximum charging / discharging power that the energy storage unit 300 connected to the converter 10 can support, used to characterize the maximum power that the converter 10 or the energy storage unit 300 can support. Furthermore, the target threshold is set for each converter 10, meaning that the target threshold may be different for different converters 10.

[0124] When the converter device 100 includes n converters 10, and the number of the first converter is 1, the number of the second converter is n-1, that is, the target number is n-1, and the total dispatch power is a×(n-1).

[0125] After equalization, the first initial power is obtained as pi, and the second initial power is obtained as pj, where 1≤i≤n, 1≤j≤n, and j≠i.

[0126] When the second initial power is greater than the preset scheduling power (pj > a), the power of the second converter is sufficient for scheduling. While ensuring the continuous operation of the second converter, a portion of the second initial power can be allocated to the first converter, thereby making the first operating power pi_new of the first converter different from the second operating power pj_new of the second converter, where 1 ≤ i ≤ n, 1 ≤ j ≤ n, and j ≠ i.

[0127] However, if the power of the first converter after receiving the dispatched power exceeds the target threshold, it may cause damage to the first converter. Therefore, it is also necessary to determine whether the sum of the initial power and the total dispatched power is less than the target threshold to determine whether the first converter can withstand power dispatch.

[0128] When the sum of the first initial power pi and the total dispatched power a×(n+1) is less than the target threshold Pi, pi+a×(n+1)≤Pi. At this time, the first converter can withstand power dispatch, and the first operating power after power dispatch will not be too large.

[0129] Therefore, when pj > a and pi + a × (n + 1) ≤ Pi, it can be determined that the first converter can be power-scheduled according to the preset scheduling power and the total scheduling power. The second operating power of the second converter after power scheduling will not be less than 0, and the first operating power of the first converter after power scheduling will not exceed the target threshold, which can ensure that the first and second converters continue to work.

[0130] After power scheduling is completed, the first operating power pi_new and the output power of the energy storage unit 300 that should be connected to the first converter can be obtained to determine whether the power line 30 is abnormally connected.

[0131] Thus, by comparing the second initial power with the preset scheduling power, and comparing the target threshold with the sum of the first initial power and the total scheduling power, power scheduling can only be performed if the sum of the first initial power and the total scheduling power is less than the target threshold. This is to avoid the first converter being damaged due to excessive power after power scheduling, and to prevent the second converter from failing to work after scheduling.

[0132] Please see Figure 6 In some embodiments, step 01121, which involves power scheduling of the first converter based on the preset scheduling power and the total scheduling power, includes:

[0133] Step 011211: Control the first converter to operate based on the sum of the first initial power and the total dispatched power;

[0134] Step 011212: Control the second converter to work based on the difference between the second initial power and the preset scheduling power.

[0135] In some implementations, the processor can be used to control the operation of a first converter based on the sum of a first initial power and a total scheduled power; and to control the operation of a second converter based on the difference between a second initial power and a preset scheduled power.

[0136] In some embodiments, the first scheduling unit includes a first control subunit and a second control subunit. The first control subunit can be used to control the operation of a first converter based on the sum of a first initial power and a total scheduled power; the second control subunit can be used to control the operation of a second converter based on the difference between a second initial power and a preset scheduled power.

[0137] Specifically, when the second initial power is greater than the preset scheduling power, and the sum of the first initial power and the total scheduling power is less than or equal to the target threshold, the sum of the first initial power pi and the total scheduling power a×(n-1) is assigned to the first operating power pi_new, then pi_new = pi + a×(n-1), and the first operating power pi_new controls the operation of the first converter. The difference between the second initial power pj and the preset scheduling power a is assigned to the second operating power pj_new, then pj_new = pj - a, and the second operating power pj_new controls the operation of the second converter.

[0138] Since the first initial power pi and the second initial power pj are approximately equal after equalization, and both a and n are positive, pi_new > pj_new, meaning the first operating power and the second operating power are different. Furthermore, pi_new + pj_new = pi + a × (n-1) + (pj - a) × (n-1) = pi + pj × (n-1), which means the sum of the operating powers of all converters 10 after scheduling is equal to the sum of the initial powers of all converters 10 before scheduling.

[0139] Thus, when it is determined that the second initial power is sufficient to be allocated to the first converter, the sum of the first initial power and the total dispatch power is assigned to the first operating power, and the difference between the second initial power and the preset dispatch power is assigned to the second operating power, so that the first operating power after dispatch is different from the second operating power, and the total power of the converter 100 remains unchanged before and after dispatch.

[0140] Please see Figure 7 In some implementations, step 0112: power dispatching of the first converter based on the first initial power and the second initial power includes:

[0141] 01122: When the first initial power is greater than the total dispatch power, and the sum of the second initial power and the preset dispatch power is less than or equal to the target threshold, the first converter is power dispatched according to the preset dispatch power and the total dispatch power. The total dispatch power is the product of the preset dispatch power and the target number, and the target number is the number of second converters.

[0142] In some implementations, the processor can be used to perform power scheduling on the first converter based on the preset scheduling power and the total scheduling power, provided that the first initial power is greater than the total scheduling power and the sum of the second initial power and the preset scheduling power is less than or equal to a target threshold.

[0143] In some implementations, the scheduling submodule includes a second scheduling unit, which is used to perform power scheduling on the first converter according to the preset scheduling power and the total scheduling power when the first initial power is greater than the total scheduling power and the sum of the second initial power and the preset scheduling power is less than or equal to a target threshold. The total scheduling power is the product of the preset scheduling power and the target number, and the target number is the number of second converters.

[0144] Specifically, when the initial power is greater than the total dispatched power (pi > a × (n-1), then n-1 preset dispatched powers a to n-1 second converters can be dispatched from the initial power pi of the first converter. The initial operating power of the first converter after power dispatch will not be less than 0, ensuring that the first converter continues to operate.

[0145] When the initial power is greater than the total dispatched power, the initial power can be partially dispatched to the second converter while ensuring its operation. However, as mentioned above, if the power of the second converter after receiving the dispatched power exceeds the target threshold, it may cause damage to the second converter. Therefore, it is also necessary to determine whether the sum of the second initial power and the preset dispatched power is less than the target threshold to determine whether the second converter can withstand power dispatch.

[0146] When the sum of the second initial power pj and the preset dispatch power a is less than or equal to the target threshold Pj, pj+a≤Pj, then the second converter can withstand power dispatch, and the second operating power after power dispatch will not be too large.

[0147] Therefore, when the first initial power is greater than the total dispatch power, and the sum of the other second initial powers and the preset dispatch power is less than or equal to the target threshold, that is, when pi > a × (n-1) and pj + a ≤ Pj, it is determined that the first converter can be power dispatched according to the preset dispatch power and the total dispatch power, so as to dispatch part of the power of the first converter to the second converter.

[0148] After power scheduling is completed, the first operating power pi_new and the output power of the energy storage unit 300 that should be connected to the first converter can be obtained to determine whether the power line 30 is abnormally connected.

[0149] Thus, by comparing the first initial power with the total scheduled power, and comparing the target threshold with the sum of the second initial power and the preset scheduled power, power scheduling can only be performed if the first initial power is greater than the total scheduled power, and the sum of the other second initial powers and the preset scheduled power is less than or equal to the target threshold. This is to avoid the second converter being damaged due to excessive power after power scheduling, and to prevent the first converter from becoming inoperable after scheduling.

[0150] Please see Figure 8 In some embodiments, step 01122, which involves power scheduling of the first converter based on the preset scheduling power and the total scheduling power, includes:

[0151] 011221: Control the operation of the first converter based on the difference between the initial power and the total dispatch power;

[0152] 011222: Control the operation of the second converter based on the sum of the second initial power of converter 10 and the preset scheduling power.

[0153] In some implementations, the processor can be used to control the operation of the first converter based on the difference between the first initial power and the total scheduled power; and to control the operation of the second converter based on the sum of the second initial power of the converter 10 and the preset scheduled power.

[0154] In some embodiments, the second scheduling unit includes a third control subunit and a fourth control subunit. Among them, the third control subunit can be used to control the operation of the first converter according to the difference between the first initial power and the total scheduling power; the fourth control subunit can be used to control the operation of the second converter according to the sum of the second initial power of the converter 10 and the preset scheduling power.

[0155] Specifically, when the first initial power pi is sufficient to be allocated to the second converter, the difference between the first initial power pi and the total scheduling power a×(n - 1) is given to the first operating power pi_new, then pi_new = pi - a×(n - 1), and the first converter is controlled to operate with the first operating power pi_new. The sum of the second initial power pj of the second converter and the preset scheduling power a is given to the second operating power pj_new, then pj_new = pj + a, and the second converter is controlled to operate with the second operating power pj_new.

[0156] As described above, after balancing, the first initial power pi and the second initial power pj are approximately equal, and both a and n are positive values. Therefore, pi_new < pj_new, that is, the first operating power and the second operating power are different. And pi_new + pj_new = pi - a×(n - 1) + (pj + a)×(n - 1) = pi + pj×(n - 1), that is, the sum of the operating powers of all converters 10 after scheduling is equal to the sum of the initial powers of all converters 10 before scheduling.

[0157] In this way, when it is determined that the first initial power is sufficient to be allocated to the second converter, the difference between the first initial power and the total scheduling power is given to the first operating power, and the sum of the second initial power and the preset scheduling power is given to the second operating power, which can make the first operating power and the second operating power different after scheduling, and the total power of the converter device 100 remains unchanged before and after scheduling.

[0158] Please refer to Figure 9 , in some embodiments, the inspection method further includes:

[0159] 014: When the first preset condition and the second preset condition are not satisfied, stop the inspection of the power line 30. The first preset condition is: the second initial power is greater than the preset scheduling power, and it is determined that the sum of the first initial power and the total scheduling power is less than or equal to the target threshold; the second preset condition is: the first initial power is greater than the total scheduling power, and the sum of the second initial power and the preset scheduling power is less than or equal to the target threshold.

[0160] In some embodiments, the processor can be used to stop the inspection of the power line 30 when the first preset condition and the second preset condition are not satisfied.

[0161] In some embodiments, the inspection unit further includes a stop module, which is used to stop the inspection of the power line 30 if neither the first preset condition nor the second preset condition is met.

[0162] Specifically, the first preset condition is: the second initial power pj is greater than the preset scheduling power a, and the sum of the first initial power pi and the total scheduling power a×(n+1) is less than the target threshold Pi. Therefore, the first preset condition is not met when the second initial power pj is less than or equal to the preset scheduling power, or when the sum of the first initial power pi and the total scheduling power is greater than the target threshold. That is, the first preset condition is not met when pj≤a or pi+a×(n+1)>Pi.

[0163] The second preset condition is: the first initial power pi is greater than the total scheduling power, and the sum of the other second initial powers pj and the preset scheduling power a is less than or equal to the target threshold Pj. Therefore, the second preset condition is not met when the first initial power pi is less than or equal to the total scheduling power, or when the sum of the other second initial powers pj and the preset scheduling power is greater than the target threshold.

[0164] It can be seen that when the second initial power pj is less than or equal to the preset scheduling power, or when the sum of the first initial power pi and the total scheduling power is greater than the target threshold, and the first initial power pi is less than or equal to the total scheduling power, or when the sum of the second initial power pj and the preset scheduling power is greater than the target threshold, that is, when pj≤a and pi≤a×(n-1), or when pj≤a and pj+a>Pj, or when pi+a×(n+1)>Pi and pi≤a×(n-1), or when pi+a×(n+1)>Pi and pj+a>Pj, the inspection of the power line 30 is stopped.

[0165] In one embodiment, if pj≤a and pi≤a+(n-1), then it is determined that the second initial power is insufficient to be allocated to the first converter and the first initial power is insufficient to be allocated to the second converter, and the inspection of the power line 30 is stopped.

[0166] Thus, if the conditions for power dispatch are not met, the initial power of converter 10 is insufficient to support power dispatch, or converter 10 will have excessive power and cannot work normally after dispatch, so the inspection of power line 30 is stopped.

[0167] Please see Figure 10 In some implementations, the inspection method further includes:

[0168] 015: Determine the target threshold based on the maximum charge / discharge power of converter 10 and the maximum charge / discharge power of energy storage unit 300 of converter 10.

[0169] In some implementations, the processor can be used to determine a target threshold based on the maximum charge / discharge power of the converter 10 and the maximum charge / discharge power of the energy storage unit 300 of the converter 10.

[0170] In some embodiments, the inspection unit further includes a threshold determination module. The threshold determination module can be used to determine a target threshold based on the maximum charge / discharge power of the converter 10 and the maximum charge / discharge power of the energy storage unit 300 of the converter 10.

[0171] Specifically, the inverter 10 uploads the maximum charge / discharge power to the local controller 50, the battery system control module (BSC) uploads the maximum charge / discharge power of the energy storage unit 300 to the local controller 50, and the local controller 50 uses the smaller of the maximum charge / discharge power of the inverter 10 and the maximum charge / discharge power of the energy storage unit 300 as the target threshold.

[0172] In addition, each converter 10 corresponds to a target threshold Pi. The target threshold Pi of the i-th converter 10 is determined based on the maximum charge / discharge power of the i-th converter 10 and the maximum charge / discharge power of the corresponding i-th energy storage unit 300.

[0173] In one embodiment, if the maximum charge / discharge power P1max_pcs of the first converter 10 is less than the maximum charge / discharge power P1max_b of the first energy storage unit 300, i.e., P1max_pcs < P1max_b, then the target threshold is the maximum charge / discharge power P1max_pcs of the converter 10, i.e., P1 = P1max_pcs.

[0174] Thus, by determining the target threshold based on the maximum charge / discharge power of the converter 10 and the maximum charge / discharge power of the energy storage unit 300 connected to the converter 10, damage to the converter 10 due to excessive power after power dispatch can be avoided.

[0175] Please see Figure 11 In some embodiments, step 013, determining the connection state of the power line 30 connected to the first converter based on the first operating power and the output power of the energy storage unit 300, includes:

[0176] Step 0131: If the difference between the first operating power and the output power of the energy storage unit 300 is greater than or equal to a set difference, it is determined that the connection of the power line 30 connected to the first converter is abnormal.

[0177] Step 0132: If the difference between the first operating power and the output power of the energy storage unit 300 is less than the set difference, it is determined that the power line 30 connected to the first converter is correctly connected.

[0178] In some embodiments, the processor can be used to determine that the power line 30 connected to the first converter is abnormal when the difference between the first operating power and the output power of the energy storage unit 300 is greater than or equal to a set difference; and to determine that the power line 30 connected to the first converter is correctly connected when the difference between the first operating power and the output power of the energy storage unit 300 is less than a set difference.

[0179] In some embodiments, the first state determination module includes a first determination submodule and a second determination submodule. The first determination submodule is used to determine that the power line 30 connected to the first converter is abnormally connected if the difference between the first operating power and the output power of the energy storage unit 300 is greater than or equal to a set difference. The second determination submodule is used to determine that the power line 30 connected to the first converter is correctly connected if the difference between the first operating power and the output power of the energy storage unit 300 is less than a set difference.

[0180] Specifically, the difference δ is set to a pre-set value, which can be determined according to the actual situation.

[0181] If the difference between the first operating power pi_new and the output power bi of the energy storage unit 300 is greater than or equal to the set difference δ (i.e., pi_new - bi ≥ δ), the power of the first converter differs too much from the power of the corresponding energy storage unit 300, indicating a mismatch. In this case, it can be considered that the first converter is connected to the corresponding energy storage unit 300, and there is a connection abnormality in the power line 30. A fault status can be reported, and the converter 100 enters a fault shutdown state.

[0182] When the difference between the first operating power pi_new and the output power bi of the energy storage unit 300 is less than the set difference δ (i.e., pi_new - bi < δ), and the power of the first converter differs little from the power of the corresponding energy storage unit 300, the power of the energy storage unit 300 corresponding to the first converter is affected by the power scheduling of the first converter, and its power also changes. Therefore, it can be considered that the first converter and the corresponding energy storage unit 300 are correctly connected via the power line 30, meaning there is no abnormality in the connection of the power line 30 of the first converter.

[0183] Thus, based on the comparison between the difference between the first operating power and the output power of the energy storage unit 300 and the set difference, the power line of the first converter can be determined. In some embodiments, if it is determined that there is no abnormality in the current power line 30 of the first converter, the original first converter is used as the second converter, and one of the original second converters is used as the new first converter. The new first converter is then checked for any abnormalities in the power line 30. This process continues until all converters 10 have been traversed, and if there are no abnormalities in the power line 30 connection of any converter 10, the power of the converter 10 is restored to its initial power.

[0184] Please see Figure 12 In some implementations, the inspection method further includes:

[0185] 016: If there are no abnormalities in the power lines 30 connected to all converters 10, control the converter 10 to operate according to the initial power of the converter 10, and stop checking the power lines 30.

[0186] In some implementations, the processor can be used to control the operation of the converter 10 based on the initial power of the converter 10 and stop checking the power lines 30 when there are no abnormalities in all the power lines 30 connected to the converter 10.

[0187] In some embodiments, the inspection unit further includes a control module. The control module is used to control the operation of the converter 10 based on the initial power of the converter 10 and to stop the inspection of the power lines 30 when no abnormalities are found in the power lines 30 connected to all converters 10.

[0188] Specifically, if there are no abnormalities in the power lines 30 connected to all converters 10, the initial power of the converter 10 is taken as the current power of the converter 10, that is, the first initial power is taken as the power of the first converter and the second initial power is taken as the power of the second converter, so as to restore the working state when the state of charge of the energy storage unit 300 is balanced, and the inspection of the power lines 30 is stopped.

[0189] Thus, having confirmed that there are no abnormalities in the power lines 30 connected to all converters 10, the inspection of the power lines 30 has been completed, and therefore the inspection of the power lines 30 is stopped. At this time, the energy storage power of the converter 10 is used as the operating power to restore the converter 10 to the operating state after the equalization process of the energy storage unit 300, thereby restoring the normal operation of the converter device 100.

[0190] Please see Figure 13This application provides a method for inspecting the power line 30 of a converter system 1000. The converter system 1000 includes multiple converters 10 and multiple energy storage units 300, with each converter 10 and energy storage unit 300 corresponding to one another. Each converter 10 includes a first converter, which can be any one of the converters 10 in the converter system 1000. The input terminals of the multiple converters 10 are all connected to the energy storage units 300 through the power line 30, and the output terminals of the multiple converters 10 are connected in parallel. The inspection method includes:

[0191] 021: Perform power scheduling on the first converter and obtain the first operating power of the first converter after power scheduling;

[0192] 022: Obtain the output power of the energy storage unit 300 corresponding to the first converter;

[0193] 023: Determine the connection status of the power line 30 connected to the first converter based on the first operating power and output power.

[0194] This application provides a power line 30 inspection device for a converter system 1000. The converter system 1000 includes multiple converters 10 and multiple energy storage units 300, with each converter 10 and energy storage unit 300 corresponding to one another. Each converter 10 includes a first converter, which can be any one of the converters 10 in the converter system 1000. The input terminals of the multiple converters 10 are all connected to the energy storage units 300 via power lines 30, and the output terminals of the multiple converters 10 are connected in parallel. The inspection device includes a second power scheduling module, a second power acquisition module, and a second state determination module. The second power scheduling module is used to perform power scheduling on the first converter and acquire the first operating power of the first converter after power scheduling. The second power acquisition module is used to acquire the output power of the energy storage unit 300 corresponding to the first converter. The second state determination module is used to determine the connection state of the power line 30 connected to the first converter based on the first operating power and the output power.

[0195] Specifically, the converter system 1000 includes a photovoltaic system, an energy storage system, etc. In one embodiment, the photovoltaic system includes photovoltaic cells and a converter 10. The converter 10 and the photovoltaic cells are connected one-to-one via power lines 30. By performing power scheduling on the converter 10 and comparing the power of the converter 10 with that of its corresponding photovoltaic cells, the connection status of the power line 30 connected to the converter 10 can be determined.

[0196] It should be noted that the above explanation of the power line 30 inspection method of the converter device 100 in the embodiments of this application applies to the power line 30 inspection method and power line 30 inspection device of the converter system 1000 in the embodiments of this application, and will not be repeated here.

[0197] This application provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the inspection method as described in any of the above embodiments.

[0198] It is understood that a computer program includes computer program code. Computer program code can be in the form of source code, object code, executable files, or some intermediate form. Computer-readable storage media can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, external hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), and software distribution media, etc.

[0199] In the description of this specification, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with an embodiment or example that are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, without contradiction, those skilled in the art can combine and integrate different embodiments or examples described in this specification, as well as features of different embodiments or examples.

[0200] Furthermore, the term "connection" should be interpreted broadly. For example, it can include fixed connections, detachable connections, or integral connections; it can include direct connections or indirect connections through an intermediate medium; and it can also include internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0201] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0202] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order according to the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0203] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A method for inspecting the power line of a converter, characterized in that, The converter device includes multiple converters, and each converter corresponds to a multiple energy storage unit. Each converter includes a first converter, which can be any one of the converters in the converter device. The input terminals of the multiple converters are all connected to the energy storage unit through power lines, and the output terminals of the multiple converters are connected in parallel. The inspection method includes: Power scheduling is performed on the first converter to obtain the first operating power of the first converter after power scheduling; Obtain the output power of the energy storage unit corresponding to the first converter; The connection status of the power line connected to the first converter is determined based on the first operating power and the output power.

2. The inspection method according to claim 1, characterized in that, The power scheduling of the first converter includes: After the energy storage units in the converter are balanced, the first initial power of the first converter and the second initial power of each second converter before power scheduling are obtained. The second converter is any converter in the converter other than the first converter. The first converter is power-scheduled based on the first initial power and the second initial power, so that the first operating power of the first converter is different from the second operating power of the second converter, and the sum of the power of all the converters after power scheduling is the same as the sum of the initial power of all the converters.

3. The inspection method according to claim 2, characterized in that, The power scheduling of the first converter based on the first initial power and the second initial power includes: If the second initial power is greater than the preset scheduling power, and the sum of the first initial power and the total scheduling power is less than or equal to the target threshold, the first converter is power-scheduled according to the preset scheduling power and the total scheduling power. The total scheduling power is the product of the preset scheduling power and the target number, and the target number is the number of the second converter.

4. The inspection method according to claim 3, characterized in that, The step of power scheduling of the first converter based on the preset scheduling power and the total scheduling power includes: The first converter is controlled to operate based on the sum of the first initial power and the total scheduled power. The second converter is controlled to operate based on the difference between the second initial power and the preset scheduling power.

5. The inspection method according to claim 2, characterized in that, The power scheduling of the first converter based on the first initial power and the second initial power includes: When the first initial power is greater than the total dispatch power, and the sum of the second initial power and the preset dispatch power is less than or equal to the target threshold, the first converter is power-dispatched according to the preset dispatch power and the total dispatch power. The total dispatch power is the product of the preset dispatch power and the target number, and the target number is the number of the second converters.

6. The inspection method according to claim 5, characterized in that, The step of power scheduling of the first converter based on the preset scheduling power and the total scheduling power includes: The first converter is controlled to operate based on the difference between the initial power and the total scheduled power. The second converter is controlled to operate based on the sum of the second initial power of the converter and the preset scheduling power.

7. The inspection method according to claim 2, characterized in that, The inspection method also includes: If neither the first preset condition nor the second preset condition is met, the inspection of the power line is stopped. The first preset condition is: the second initial power is greater than the preset scheduling power, and the sum of the first initial power and the total scheduling power is less than or equal to the target threshold. The second preset condition is: the first initial power is greater than the total scheduling power, and the sum of the second initial power and the preset scheduling power is less than or equal to the target threshold.

8. The inspection method according to any one of claims 3-7, characterized in that, The inspection method also includes: The target threshold is determined based on the maximum charge / discharge power of the converter and the maximum charge / discharge power of the energy storage unit.

9. The inspection method according to claim 1, characterized in that, Determining the connection status of the power line connected to the first converter based on the first operating power and the output power includes: If the difference between the first operating power and the output power of the energy storage unit is greater than or equal to a set difference, it is determined that the power line connection of the first converter is abnormal. If the difference between the first operating power and the output power of the energy storage unit is less than a set difference, it is determined that the power line connected to the first converter is correctly connected.

10. The inspection method according to claim 1, characterized in that, The inspection method also includes: If there are no abnormalities in any of the power lines connected to the converter, control the converter to operate according to the initial power of the converter, and stop checking the power lines.

11. A power line inspection unit for a converter, characterized in that, The converter device includes multiple converters, and each converter corresponds to a multiple energy storage unit. Each converter includes a first converter, which can be any one of the converters in the converter device. The input terminals of the multiple converters are all connected to the energy storage unit through power lines, and the output terminals of the multiple converters are connected in parallel. The inspection unit includes: The first power scheduling module is used to perform power scheduling on the first converter and obtain the first operating power of the first converter after power scheduling. The first power acquisition module is used to acquire the output power of the energy storage unit corresponding to the first converter. The first state determination module is used to determine the connection state of the power line connected to the first converter based on the first operating power and the output power.

12. The inspection unit according to claim 11, characterized in that, The first power scheduling module includes: The acquisition submodule is used to acquire the first initial power of the first converter and the second initial power of each second converter before power scheduling after the energy storage units in the converter are balanced. The second converter is any converter in the converter other than the first converter. The scheduling submodule is used to perform power scheduling on the first converter according to the first initial power and the second initial power, so that the first operating power of the first converter is different from the second operating power of the second converter, and the sum of the power of all the converters after power scheduling is the same as the sum of the initial power of all the converters.

13. The inspection unit according to claim 12, characterized in that, The scheduling submodule includes: The first scheduling unit is configured to perform power scheduling on the first converter according to the preset scheduling power and the total scheduling power when the second initial power is greater than the preset scheduling power and the sum of the first initial power and the total scheduling power is less than or equal to the target threshold. The total scheduling power is the product of the preset scheduling power and the target number, and the target number is the number of the second converter.

14. The inspection unit according to claim 12, characterized in that, The scheduling submodule includes: The second scheduling unit is used to perform power scheduling on the first converter according to the preset scheduling power and the total scheduling power when the first initial power is greater than the total scheduling power and the sum of the second initial power and the preset scheduling power is less than or equal to the target threshold. The total scheduling power is the product of the preset scheduling power and the target number, and the target number is the number of the second converter.

15. The inspection unit according to claim 12, characterized in that, The inspection unit also includes: A stop module is used to stop the inspection of the power line if neither a first preset condition nor a second preset condition is met. The first preset condition is that the second initial power is greater than the preset scheduling power, and the sum of the first initial power and the total scheduling power is less than or equal to a target threshold. The second preset condition is that the first initial power is greater than the total scheduling power, and the sum of the second initial power and the preset scheduling power is less than or equal to the target threshold.

16. The inspection unit according to claim 11, characterized in that, The first state determination module includes: The first determining submodule is used to determine that the power line connection of the first converter is abnormal when the difference between the first operating power and the output power of the energy storage unit is greater than or equal to a set difference. The second determining submodule is used to determine that the power line connection of the first converter is correct when the difference between the first operating power and the output power of the energy storage unit is less than a set difference.

17. The inspection unit according to claim 11, characterized in that, The inspection unit also includes: The control module is used to control the converter to operate based on the initial power of the converter and stop the inspection of the power lines when there are no abnormalities in the power lines connected to all the converters.

18. A method for inspecting the power lines of a converter system, characterized in that, The converter system includes multiple converters and multiple energy storage units, with one converter and one energy storage unit corresponding to each other. Each converter includes a first converter, which can be any one of the converters in the converter system. The input terminals of the multiple converters are all connected to the energy storage units through power lines, and the output terminals of the multiple converters are connected in parallel. The inspection method includes: Power scheduling is performed on the first converter to obtain the first operating power of the first converter after power scheduling; Obtain the output power of the energy storage unit corresponding to the first converter; The connection status of the power line connected to the first converter is determined based on the first operating power and the output power.

19. A power line inspection device for a converter system, characterized in that, The converter system includes multiple converters and multiple energy storage units, with one converter and one energy storage unit corresponding to each other. Each converter includes a first converter, which can be any one of the converters in the converter system. The input terminals of the multiple converters are all connected to the energy storage units through power lines, and the output terminals of the multiple converters are connected in parallel. The inspection device includes: The second power scheduling module is used to perform power scheduling on the first converter and obtain the first operating power of the first converter after power scheduling. The second power acquisition module is used to acquire the output power of the energy storage unit corresponding to the first converter. The second state determination module is used to determine the connection state of the power line connected to the first converter based on the first operating power and the output power.

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