A communication link inspection method and computer equipment for flexible direct current valve submodule networking

Abstract

The present invention belongs to the field of communication link inspection, and specifically relates to a communication link inspection method and computer equipment for a flexible direct current valve submodule network. According to the number of times that the actual communication path of a communication link with a certain submodule in the networking unit to be inspected is inconsistent with a preset shortest communication path, it is determined whether there is a problem with the communication link. Under the premise of not adding redundant communication burden to the networking, the present invention compares the actual path and the shortest path of the communication link with a certain submodule as the end point in the networking (the communication link with the submodule as the end point is regarded as the communication link to be inspected), and determines whether there is a problem with the communication link by the number of times that the actual communication path is inconsistent with the preset shortest communication path, and reflects the abnormal communication status that may exist in the communication link, thereby achieving the purpose of real-time and effective problem inspection of the communication networking link.

Description

Technical Field

[0001] The present invention belongs to the field of communication link inspection, and in particular relates to a communication link inspection method and computer equipment for flexible direct current (DC) converter valve submodule networking. Background Art

[0002] Modular multilevel converters (MMCs) are essential core equipment in the field of flexible power transmission technology. However, with the recent increase in flexible DC voltage levels and the increasing number of power submodules, this situation has led to a large number of fiber optic connections between the power submodule interface chassis and the converter valve system, resulting in high costs and inconvenient operations and maintenance. However, due to the limitations of direct fiber optic channels and the lack of redundant pulse boards in the valve control system, a pulse board failure can cause all power modules under its control to bypass, severely impacting the reliability of the pulse distribution link. Furthermore, there is the risk of overvoltage damage to the modules if the corresponding bypass switches fail to operate.

[0003] Redundant pulse distribution links significantly increase the cost and operational difficulty of flexible DC pulse distribution fiber. A technical solution has been proposed for flexible DC submodule networking that addresses the non-redundancy issue of pulse distribution links while maintaining the existing communication architecture and eliminating the need to further increase the number of pulse distribution fibers. This method integrates and optimizes communication between modular multilevel converter power modules and utilizes fiber optic consolidation through on-site networking between submodules. This significantly reduces the need for long-distance fiber configurations and, while reducing equipment costs, enables redundant communication between the pulse board and the power module, improving the reliability of the pulse distribution link and the communication between the valve control system and the submodules.

[0004] Although the flexible DC submodule networking method has many advantages, how to realize the communication link inspection of the network after the submodules are networked is an urgent problem; because once the communication link fails, the transmission efficiency of the network will be greatly reduced; however, since the communication link failure of the flexible DC submodule network is difficult to detect in time by checking each node in the network, it is difficult to perform operation and maintenance on it. Because after the submodules are networked, communication with the valve control is completed through equally spaced submodules. During maintenance, all submodules in the network need to be powered on to realize the monitoring of the network link. When the converter valve is not powered, it is necessary to rely on an external independent power supply to build a detection environment. The difficulty in building the detection environment leads to low efficiency of operation and maintenance, and it is difficult to ensure the reliability of communication of the networking unit. Summary of the Invention

[0005] The purpose of the present invention is to provide a communication link inspection method and computer equipment for flexible DC converter valve submodule networking, so as to solve the problems of difficult inspection of link failures and low operation and maintenance efficiency in existing flexible DC submodule networking.

[0006] To achieve the above-mentioned purpose, the present invention provides a communication link inspection method for a flexible DC converter valve sub-module network, which determines whether there is a problem with the communication link based on the number of times the actual communication path of the communication link with a sub-module in the networking unit to be inspected as the end point is inconsistent with the preset shortest communication path.

[0007] Beneficial effect: As a pioneering invention, the present invention compares the actual path and the shortest path of the communication link with a certain sub-module as the end point in the network (the communication link with the sub-module as the end point is regarded as the communication link to be inspected) without adding redundant communication burden to the network. The number of times the actual communication path is inconsistent with the preset shortest communication path is used to determine whether there is a problem with the communication link. This is equivalent to whether the communication link with a certain sub-module as the end point often fails to communicate according to the shortest path, which reflects the possible abnormal communication state of the communication link, thereby achieving the purpose of real-time and effective problem inspection of the communication networking link. Therefore, on the basis of the difficulty in setting up the detection environment, it can accurately and efficiently determine the faulty or abnormal links in the network, which is of great help to improve the efficiency of sub-module maintenance, effectively improve the efficiency of operation and maintenance, and ensure the reliability of communication of networking units.

[0008] Furthermore, based on the number of times that the actual communication path of the communication link with a certain submodule in the networking unit to be checked is inconsistent with the preset shortest communication path, the method of judging whether there is a problem with the communication link includes: obtaining the actual communication path of the networking to be checked at different times multiple times within a set time interval, and judging whether each actual communication path obtained is consistent with the corresponding shortest communication path, and obtaining each judgment result; judging whether there is a problem with the communication link based on the number of judgment results that the actual communication path obtained is consistent with the corresponding shortest communication path or the number of judgment results that the actual communication path obtained is inconsistent with the corresponding shortest communication path.

[0009] Furthermore, based on the number of judgment results that the actual communication path obtained is inconsistent with the corresponding shortest communication path, the method of judging whether there is a problem with the communication link includes: if the number of inconsistent judgment results is greater than a first problem threshold, it is determined that there is a problem with the link segment; the first problem threshold is less than the total number of all judgment results and is greater than or equal to 0.

[0010] Furthermore, the problem occurring in the link includes the link being in a permanent fault state; if the number of the inconsistent judgment results is greater than or equal to a first permanent fault numerical threshold, the link segment is determined to be in a permanent fault state, and the first permanent fault numerical threshold is greater than the first problem threshold and less than or equal to the total number of all judgment results.

[0011] Furthermore, the problems occurring in the link include the link being in a permanent fault state; if the ratio of the number of inconsistent judgment results to the total number of all judgment results is greater than or equal to a first permanent fault ratio threshold, then the link segment is determined to be in a permanent fault state, and the first permanent fault ratio threshold is greater than the ratio of the first problem threshold to the total number of all judgment results and is less than or equal to 1.

[0012] Furthermore, the problem occurring in the link also includes the link being in a sub-healthy or abnormal state; if the number of the inconsistent judgment results is greater than the first problem threshold and less than the first permanent fault numerical threshold, it is determined that the link is in a sub-healthy or abnormal state.

[0013] Furthermore, the problems that occur in the link also include the link being in a sub-healthy or abnormal state; if the ratio of the number of inconsistent judgment results to the total number of all judgment results is greater than or equal to the ratio of the first problem threshold to the total number of all judgment results and is less than the first permanent fault ratio threshold, then it is determined that the link is in a sub-healthy or abnormal state.

[0014] Furthermore, based on the number of judgment results that the actual communication path obtained is inconsistent with the corresponding shortest communication path, the method of judging whether there is a problem with the communication link includes: if the ratio of the number of inconsistent judgment results to the total number of all judgment results is greater than a second problem threshold, it is judged that there is a problem with the link segment; the second problem threshold is less than 1 and greater than or equal to 0.

[0015] Furthermore, the problem occurring on the link includes the link being in a permanent fault state; if the ratio of the number of the inconsistent judgment results to the total number of all judgment results is greater than or equal to a second permanent fault ratio threshold, then the link is determined to be in a permanent fault state, and the second permanent fault ratio threshold is greater than a second problem threshold and less than or equal to 1;

[0016] The link problem also includes that the link is in a permanent fault state; if the number of the inconsistent judgment results is greater than or equal to a second permanent fault numerical threshold, then the link is determined to be in a permanent fault state, and the second permanent fault numerical threshold is greater than the product of the second problem threshold and the total number of all judgment results and is less than or equal to the total number of all judgment results;

[0017] The link problem also includes the link being in a sub-healthy or abnormal state; if the ratio of the number of inconsistent results to the total number of all judgment results is greater than a second problem threshold and less than a second permanent fault ratio threshold, then the link is determined to be in a sub-healthy or abnormal state;

[0018] The problems that occur in the link also include the link being in a sub-healthy or abnormal state; if the number of inconsistent results is greater than the product of the second problem threshold and the total number of all judgment results and is less than the second permanent fault value threshold, it is determined that the link is in a sub-healthy or abnormal state.

[0019] The present invention also provides a computer device, including a processor, wherein the processor stores executable program instructions, and the executable program instructions are used to be executed to implement the communication link checking method of the network.

[0020] The computer device can achieve the same beneficial effects as the networked communication link checking method. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the network system architecture of the flexible direct current transmission converter valve submodule in the embodiment of the communication link inspection method of the flexible direct current transmission converter valve submodule network of the present invention;

[0022] Figure 2 Schematic diagram of the shortest path selection in the networking of flexible direct current transmission converter valve submodules in the embodiment of the communication link inspection method of the flexible direct current transmission converter valve submodule network of the present invention;

[0023] Figure 3 It is a flowchart of the communication link checking method for networking of flexible DC converter valve submodules in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0025] Embodiment of a method for checking a communication link in a flexible DC converter valve submodule network

[0026] This embodiment provides a technical solution for a method for checking the communication link of a flexible DC converter valve sub-module network. The method determines whether there is a problem with the communication link based on the number of times the actual communication path of the communication link ending at a sub-module in the networking unit to be checked is inconsistent with the preset shortest communication path.

[0027] like Figure 1As shown, in this embodiment, the network to be checked is obtained by networking the flexible DC transmission converter valve submodules according to a certain rule. The submodules in each networking unit are connected to two interface boxes and four interface boards. The interface boxes are connected to the valve control to form a networking system; refer to Figure 2 In this networking system, the upper-layer controller is used as the starting point, namely starting point 1, starting point 2, starting point 3, starting point 4, etc., and the modules connected to the upper-layer controller and other modules are used as vertices (directly represented by numbers, for example, the path from the upper-layer controller to the node numbered 1 and then to the node numbered 1 is represented as starting point 1~1~2). A distance array and a label array are formed, and the values ​​in the distance array are gradually updated until the shortest communication path from the starting point to all vertices (which can be simply called the shortest path) is found, forming a routing table of the shortest path as shown in Table 1; each module of the networking unit uploads its actual communication path (which can be simply called the actual path) to the valve control background, and then forms an actual routing table; the theoretical routing table is compared with the actual routing table, and then the number of results that are inconsistent with the shortest path and the proportion of the number of results that are inconsistent with the shortest path to the total number of all results are calculated.

[0028] Table 1

[0029] Submodule Shortest Path 1 Starting point 1~1 2 Starting point 1~1~2 3 Starting point 1~1~3 4 Starting point 1~2~4 …… 1n / 3 Starting point 2~1n / 3 1n / 3+1 Starting point 2-1n / 3~1n / 3+1 …… 2n / 3 Starting point 3~2n / 3 2n / 3+1 Starting point 3-2n / 3~2n / 3+1 …… n-1 Starting point 4~n~n-1 n Starting point 4~n

[0030] In the above method, refer to Figure 3 A method for determining whether a problem occurs in a communication link based on the number of times that an actual communication path of a communication link ending at a certain submodule in a networking unit to be inspected is inconsistent with a preset shortest communication path includes: obtaining the actual communication path of the networking to be inspected at different times multiple times within a set time interval, and respectively determining whether each obtained actual communication path is consistent with the corresponding shortest communication path to obtain respective judgment results; and determining whether a problem occurs in the communication link based on the number of judgment results in which the obtained actual communication path is consistent with the corresponding shortest communication path or the number of judgment results in which the obtained actual communication path is inconsistent with the corresponding shortest communication path.

[0031] In the communication link inspection method for the network of this embodiment, a method for determining whether a problem occurs in the communication link based on the number of judgment results that the actual communication path obtained is inconsistent with the corresponding shortest communication path includes: if the number of inconsistent judgment results is greater than a first problem threshold, it is determined that a problem occurs in the link segment; the above-mentioned first problem threshold is less than the total number of all judgment results and greater than or equal to 0.

[0032] Link problems include being in a permanent fault state, a sub-healthy state, or an abnormal state. If the number of inconsistent judgment results is greater than or equal to the first permanent fault numerical threshold, or the ratio of the number of inconsistent judgment results to the total number of all judgment results is greater than or equal to the first permanent fault ratio threshold, the link is determined to be in a permanent fault state. The first permanent fault numerical threshold is greater than the first problem threshold and less than or equal to the total number of all judgment results, and the first permanent fault ratio threshold is greater than the ratio of the first problem threshold to the total number of all judgment results and less than or equal to 1. It should be noted that the judgment conditions of "the number of inconsistent judgment results is greater than or equal to the first permanent fault numerical threshold" and "the ratio of the number of inconsistent judgment results to the total number of all judgment results is greater than or equal to the first permanent fault ratio threshold" are actually two basically equivalent concepts. In specific applications (i.e., determining whether a link segment is in a permanent fault state), select one of the judgment conditions for determination.

[0033] If the number of inconsistent judgment results is greater than the first problem threshold and less than the first permanent fault threshold, or if the ratio of the number of inconsistent judgment results to the total number of all judgment results is greater than or equal to the ratio of the first problem threshold to the total number of all judgment results and less than the first permanent fault ratio threshold, the link segment is determined to be in a sub-healthy or abnormal state. Similarly, the judgment conditions of "the number of inconsistent judgment results is greater than the first problem threshold and less than the first permanent fault threshold" and "the ratio of the number of inconsistent judgment results to the total number of all judgment results is greater than or equal to the ratio of the first problem threshold to the total number of all judgment results and less than the first permanent fault ratio threshold" are actually two basically equivalent concepts. In specific applications (i.e., determining whether a link segment is in a sub-healthy or abnormal state), select one of the judgment conditions to make the determination.

[0034] In other embodiments, the link problem determined may also include only one of the link being in a permanent fault state, the link being in a sub-healthy state, or an abnormal state, which does not affect the above-mentioned determination principle.

[0035] In fact, the method of judging whether there is a problem with the communication link based on the number of judgment results that the actual communication path obtained is consistent with the corresponding shortest communication path is similar to the above-mentioned method of judging whether there is a problem with the communication link based on the number of judgment results that the actual communication path obtained is inconsistent with the corresponding shortest communication path, because the judgment logic of "if the number of inconsistent judgment results is greater than the first problem threshold, then it is judged that there is a problem with this segment of the link" is essentially equivalent to "if the number of consistent judgment results is less than or equal to the first problem threshold, then it is judged that there is a problem with this segment of the link", so the method of judging whether there is a problem with the communication link based on the number of judgment results that the actual communication path obtained is consistent with the corresponding shortest communication path can refer to the above-mentioned method of judging whether there is a problem with the communication link based on the number of judgment results that the actual communication path obtained is inconsistent with the corresponding shortest communication path, and will not be repeated here.

[0036] In this embodiment, as shown in Table 2, the time interval is set to 1 minute. If the number of judgment results that the actual communication path is inconsistent with the corresponding shortest communication path within the 1 minute is greater than or equal to the first permanent fault numerical threshold, or the ratio of the number of judgment results that the actual communication path is inconsistent with the corresponding shortest communication path to the total number of all judgment results is greater than or equal to the first permanent fault ratio threshold, then the link segment is determined to be in a permanent fault state; since in this embodiment, in addition to the permanent fault state, the problems that occur in the link also include the link being in a sub-healthy or abnormal state; then if the number of judgment results that the actual communication path is inconsistent with the corresponding shortest communication path within the 1 minute is greater than the first problem threshold and less than the first permanent fault numerical threshold, or the ratio of the number of the above-mentioned inconsistent judgment results to the total number of all judgment results is greater than or equal to the ratio of the first problem threshold to the total number of all judgment results and less than the first permanent fault ratio threshold, then the link segment is determined to be in a sub-healthy or abnormal state.

[0037] Table 2

[0038] Submodule Optimal Path Actual path Number of inconsistencies between the shortest path in 1 minute and the actual path 1-minute shortest path - number of actual path inconsistencies / total number of results * 100% 1 Starting point 1~1 Starting point 1~1 0 0 2 Starting point 1~1~2 Starting point 1~3~4~2 100 0.83‱ 3 Starting point 1~1~3 Starting point 1~1~3 0 0 …… n Starting point 4~n Starting point 4~n 0 0

[0039] As shown in Table 2, taking the total number of all results as 1,200,000, the first problem threshold as 60, the first permanent fault numerical threshold as 1,080,000, and the first permanent fault ratio threshold as 90% as an example, within the set time interval of 1 minute, the shortest path of submodule 2 (starting point 1-1-2) and the actual path (starting point 1-3-4-2) are inconsistent, and the number of inconsistencies (i.e., the number of inconsistent results) is 100 times. The proportion of inconsistent results to the total number of all results is 0.83‱. Because the number of inconsistent results between the actual path and the shortest path of submodule 2 within the set time interval of 1 minute is greater than the first problem threshold, a problem is determined for this link segment. However, the number of inconsistent results does not reach the first permanent fault numerical threshold, and the proportion of inconsistent results to the total number of results does not reach the first permanent fault ratio threshold, indicating that submodule 2 is in a subhealthy or abnormal state.

[0040] In other embodiments, whether there is a problem with the communication link can also be determined by the ratio between the number of judgment results that the actual communication path is inconsistent with the corresponding shortest communication path and the total number of all judgment results. Specifically, based on the number of judgment results that the actual communication path is inconsistent with the corresponding shortest communication path, the method of determining whether there is a problem with the communication link includes: if the ratio of the number of inconsistent judgment results to the total number of all judgment results is greater than a second problem threshold, it is determined that there is a problem with the link segment; the above-mentioned second problem threshold is less than 1 and greater than or equal to 0.

[0041] In the aforementioned case where the second problem threshold is used to determine whether a communication link has a problem, the link problems can also include being in a permanent fault state, a sub-healthy state, or an abnormal state. If the ratio of the number of inconsistent judgment results to the total number of judgment results is greater than or equal to the second permanent fault ratio threshold, or the number of inconsistent judgment results is greater than or equal to the second permanent fault numerical threshold, then the link is determined to be in a permanent fault state. The second permanent fault ratio threshold is greater than the second problem threshold and less than or equal to 1, and the second permanent fault numerical threshold is greater than the product of the second problem threshold and the total number of judgment results and less than or equal to the total number of judgment results. It should be noted that the judgment conditions of "the ratio of the number of inconsistent judgment results to the total number of judgment results is greater than or equal to the second permanent fault ratio threshold" and "the number of inconsistent judgment results is greater than or equal to the second permanent fault numerical threshold" are actually two basically equivalent concepts. In specific applications (i.e., determining whether a link segment is in a permanent fault state), one of the judgment conditions can be selected for determination.

[0042] If the ratio of the number of inconsistent results to the total number of judgment results is greater than the second problem threshold and less than the second permanent fault ratio threshold, or if the number of inconsistent results is greater than the product of the second problem threshold and the total number of judgment results and less than the second permanent fault threshold, the link segment is determined to be in a sub-healthy or abnormal state. Similarly, the judgment conditions of "the ratio of the number of inconsistent results to the total number of judgment results is greater than the second problem threshold and less than the second permanent fault ratio threshold" and "the number of inconsistent results is greater than the product of the second problem threshold and the total number of judgment results and less than the second permanent fault threshold" are actually two basically equivalent concepts. In specific applications (i.e., determining whether a link segment is in a sub-healthy or abnormal state), select one of the judgment conditions to make the judgment.

[0043] Specifically, the second permanent fault ratio threshold value can be the same as the first permanent fault ratio threshold value, and the second permanent fault numerical threshold value can be the same as the first permanent fault numerical threshold value. For example, if the total number of all results is 1,200,000, the second permanent fault ratio threshold value can be set to 90%, and the second permanent fault numerical threshold value can be set to 1,080,000.

[0044] In summary, since the present invention can obtain the actual path at the current moment and compare it with the shortest path and determine the fault, and can accurately determine different fault degrees by setting thresholds of different sizes, and the present invention uses two different angles of judgment criteria to judge whether each actual communication path obtained is consistent with the corresponding shortest communication path, and realizes the problem determination of the communication link in different judgment methods corresponding to the two problem thresholds, these two methods can be flexibly selected, so the main advantages of the present invention are the real-time completion of problem determination, the flexibility of the different judgment methods corresponding to the two problem thresholds, and the richness of the sampling samples. By adopting the method of the present invention, it is possible to simply and efficiently realize the fault inspection of the communication networking link to ensure the safe and stable operation of the networking communication, thereby greatly improving the efficiency of operation and maintenance, that is, to provide a reliable and feasible solution to the problem of difficult operation and maintenance of the networking unit, thereby effectively improving the efficiency of operation and maintenance.

[0045] Computer device embodiment

[0046] This embodiment provides a computer device, including a processor, in which executable program instructions are stored. The executable program instructions are used to be executed to implement the communication link checking method for the flexible direct current converter valve sub-module network in the above-mentioned embodiment of the communication link checking method for the flexible direct current converter valve sub-module network.

[0047] Since the operating principles and process of this computer device have been described in detail in the aforementioned embodiment of the communication link inspection method for the flexible direct current converter valve submodule network, they will not be repeated here. The present invention is not limited to the described embodiments. For those skilled in the art, based on the teachings of the present invention, designing various variations of models, formulas, and parameters does not require creative effort. Changes, modifications, substitutions, and variations to the embodiments without departing from the principles and spirit of the present invention remain within the scope of protection of the present invention.

Claims

1. A method for checking the communication link of a flexible DC converter valve submodule network, characterized in that: Whether a problem occurs in a communication link is determined based on the number of times that an actual communication path of a communication link ending at a submodule in the networking unit to be checked is inconsistent with a preset shortest communication path.

2. The communication link inspection method for flexible DC converter valve submodule networking according to claim 1 is characterized in that: A method for determining whether a problem occurs in a communication link based on the number of times that an actual communication path of a communication link ending at a certain submodule in the networking unit to be inspected is inconsistent with a preset shortest communication path includes: obtaining the actual communication path of the networking to be inspected at different times multiple times within a set time interval, and separately determining whether each obtained actual communication path is consistent with the corresponding shortest communication path, to obtain each judgment result; and determining whether a problem occurs in the communication link based on the number of judgment results in which the obtained actual communication path is consistent with the corresponding shortest communication path or the number of judgment results in which the obtained actual communication path is inconsistent with the corresponding shortest communication path.

3. The communication link inspection method for flexible DC converter valve submodule networking according to claim 2 is characterized in that: The method of determining whether there is a problem with the communication link based on the number of judgment results that indicate that the actual communication path is inconsistent with the corresponding shortest communication path includes: if the number of inconsistent judgment results is greater than a first problem threshold, it is determined that there is a problem with the link segment; the first problem threshold is less than the total number of all judgment results and greater than or equal to 0.

4. The communication link inspection method for flexible DC converter valve submodule networking according to claim 3 is characterized in that: Problems occurring in the link include the link being in a permanent fault state; if the number of inconsistent judgment results is greater than or equal to a first permanent fault numerical threshold, the link segment is determined to be in a permanent fault state, and the first permanent fault numerical threshold is greater than the first problem threshold and less than or equal to the total number of all judgment results.

5. The communication link inspection method for flexible DC converter valve submodule networking according to claim 3 is characterized in that: Problems that occur in the link include the link being in a permanent fault state; if the ratio of the number of inconsistent judgment results to the total number of all judgment results is greater than or equal to a first permanent fault ratio threshold, then the link is determined to be in a permanent fault state, and the first permanent fault ratio threshold is greater than the ratio of the first problem threshold to the total number of all judgment results and is less than or equal to 1.

6. The communication link inspection method for flexible DC converter valve submodule networking according to claim 4 or 5, characterized in that: Problems with the link also include the link being in a sub-healthy or abnormal state; if the number of inconsistent judgment results is greater than the first problem threshold and less than the first permanent fault value threshold, it is determined that the link is in a sub-healthy or abnormal state.

7. The communication link inspection method for flexible DC converter valve submodule networking according to claim 4 or 5, characterized in that: Problems that occur in the link also include the link being in a sub-healthy or abnormal state; if the ratio of the number of inconsistent judgment results to the total number of all judgment results is greater than or equal to the ratio of the first problem threshold to the total number of all judgment results and is less than the first permanent fault ratio threshold, then it is determined that the link is in a sub-healthy or abnormal state.

8. The communication link inspection method for flexible DC converter valve submodule networking according to claim 2 is characterized in that: The method of determining whether a problem exists in the communication link based on the number of judgment results that indicate that the actual communication path is inconsistent with the corresponding shortest communication path includes: if the ratio of the number of inconsistent judgment results to the total number of all judgment results is greater than a second problem threshold, then determining that a problem exists in the link segment; the second problem threshold is less than 1 and greater than or equal to 0.

9. The communication link inspection method for flexible DC converter valve submodule networking according to claim 8 is characterized in that: The problem occurring on the link includes the link being in a permanent fault state; if the ratio of the number of inconsistent judgment results to the total number of all judgment results is greater than or equal to a second permanent fault ratio threshold, then the link is determined to be in a permanent fault state, and the second permanent fault ratio threshold is greater than the second problem threshold and less than or equal to 1; Alternatively, if the number of inconsistent judgment results is greater than or equal to a second permanent fault numerical threshold, then the link segment is determined to be in a permanent fault state, and the second permanent fault numerical threshold is greater than the product of the second problem threshold and the total number of all judgment results and is less than or equal to the total number of all judgment results; The link problem also includes the link being in a sub-healthy or abnormal state; If the ratio of the number of inconsistent results to the total number of all judgment results is greater than the second problem threshold and less than the second permanent fault ratio threshold, it is determined that the link segment is in a sub-healthy or abnormal state; Alternatively, if the number of inconsistent results is greater than the product of the second problem threshold and the total number of all judgment results and is less than the second permanent fault value threshold, it is determined that the link segment is in a sub-healthy or abnormal state.

10. A computer device comprising a processor, characterized in that: The processor is used to execute a computer program to implement the steps of the communication link checking method for flexible direct current converter valve submodule networking according to any one of claims 1 to 9.

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