Flexible direct current transmission converter valve submodule networking system and communication method

Abstract

The invention provides a flexible direct current transmission converter valve sub-module networking system and a communication method. The flexible direct current power transmission converter valve sub-module networking system comprises a valve control system, and the valve control system comprises a first valve base control device; the multiple stages of valve sections are cascaded in sequence, each stage of valve section comprises a plurality of converter valve sub-modules arranged according to a matrix, every two adjacent converter valve sub-modules are in communication connection, and the first valve base control equipment is in communication connection with at least one converter valve sub-module in part of the valve sections in the multiple stages of valve sections; the number of the valve sections connected with the first valve base control equipment is greater than or equal to 2, and the communication distance between the first valve base control equipment and at least one converter valve sub-module of part of the valve sections is greater than the communication distance between a plurality of converter valve sub-modules in the valve sections. According to the invention, the communication redundancy can be improved while the number of long-distance optical fibers is reduced.

Description

Technical Field

[0001] The present application relates to the field of flexible direct current transmission, and in particular to a flexible direct current transmission converter valve submodule networking system and a communication method. Background Art

[0002] With the increasing proportion of renewable energy power generation, the complexity of the power grid has also increased. In order to suppress the impact of high-proportion renewable energy volatility and output instability on power grid reliability and realize long-distance transmission of renewable energy, ultra-high voltage flexible direct current transmission technology will be more and more widely used. However, after the development of flexible direct current transmission technology to ultra-high voltage voltage level, the number of converter valve submodules in series in a single bridge arm has increased dramatically, and the conventional "point-to-point" communication method between the converter valve submodule and the valve base control device faces huge challenges. In the conventional "point-to-point" communication method, the valve base control device establishes communication with a converter valve submodule through a pair of light-transmitting and light-receiving ports. In the application scenario where the flexible direct current voltage level continues to increase, the number of converter valve submodules has increased sharply. This communication method will cause a huge number of long-distance communication optical fibers between the valve base control device and the converter valve submodule, and the number of valve base control device cabinets will increase and be large in size, which will increase the difficulty of converter station construction and subsequent maintenance, and the resulting economic and reliability problems will be highlighted.

[0003] Currently, the number of long-distance optical fibers can be reduced by using optical distributors or connecting multiple converter valve submodules in series end to end. However, a single component failure in this method will cause the entire link communication failure, resulting in low communication redundancy and reliability. Summary of the invention

[0004] In order to solve the problem in the prior art that the huge long-distance optical fiber makes the construction and subsequent maintenance of converter stations difficult, and the communication redundancy is low, the present application provides a flexible DC transmission converter valve submodule networking system and communication method.

[0005] On the one hand, the present application provides a flexible direct current transmission valve submodule networking system, which may include: a valve control system, the valve control system including a first valve base control device; a plurality of valve sections cascaded in sequence, each valve section including a plurality of valve submodules arranged in a matrix, and each two adjacent valve submodules are communicatively connected, the first valve base control device is communicatively connected with at least one valve submodule in some valve sections in the multi-stage valve section, and the number of valve sections connected to the first valve base control device is greater than or equal to 2, and the communication distance between the first valve base control device and at least one valve submodule in some valve sections is greater than the communication distance between the plurality of valve submodules in the valve section. The first valve base control device is used to: send a control frame to at least one valve submodule in some valve sections, so that at least one valve submodule transparently transmits the control frame to other valve submodules in the same valve section and the valve section at the next stage.

[0006] Optionally, the control frame includes: control instruction segments whose number is consistent with the number of converter valve sub-modules in the valve section, and each control instruction segment corresponds to one converter valve sub-module.

[0007] Optionally, the control frame also includes a frame header and a cyclic redundancy check CRC.

[0008] Optionally, the flexible direct current transmission converter valve submodule networking system includes 2m valve sections, the 2m valve sections include m first valve sections and m second valve sections; the valve control system also includes a second valve base control device, the first valve base control device is communicatively connected to the m first valve sections respectively, and the second valve base control device is communicatively connected to the m second valve sections respectively.

[0009] Optionally, the flexible direct current transmission converter valve sub-module networking system also includes m pairs of first optical transceivers, one ends of the m pairs of first optical transceivers are connected to the first valve base control device, and the other ends of the m pairs of first optical transceivers are respectively connected to the m first valve sections; the flexible direct current transmission converter valve sub-module networking system also includes m pairs of second optical transceivers, one ends of the m pairs of second optical transceivers are connected to the second valve base control device, and the other ends of the m pairs of second optical transceivers are respectively connected to the m second valve sections.

[0010] Optionally, the m first valve sections are all valve sections of odd-numbered stages, and the m second valve sections are all valve sections of even-numbered stages.

[0011] Optionally, except for the last valve section, the last row of converter valve submodules in other valve sections are all communicatively connected with the first row of converter valve submodules in the next valve section.

[0012] Optionally, the first valve base control device is communicatively connected to a converter valve submodule in the first valve section that is connected to a next-stage valve section.

[0013] Optionally, the second valve base control device is communicatively connected to a converter valve submodule in the second valve section that is connected to the upper-level valve section.

[0014] Optionally, the first valve base control device is communicatively connected to the converter valve submodule in the first valve section that is connected to the next valve section and located in the first column, and the second valve base control device is communicatively connected to the converter valve submodule in the second valve section that is connected to the previous valve section and located in the last column.

[0015] In a second aspect of the present application, a flexible direct current transmission converter valve submodule networking communication method is further provided, which is applied to a valve control system in a flexible direct current transmission converter valve submodule networking system of any of the above-mentioned embodiments, and the communication method comprises: the valve control system sends control frames to the first converter valve submodules in the m-level valve section respectively, so that after the first converter valve submodule in the m-level valve section receives the control frame, the control frame is transparently transmitted to the second converter valve submodule that is communicatively connected to the first converter valve submodule, and the upper-level valve section or the next-level valve section, the first converter valve submodule is a converter valve submodule that is communicatively connected to the valve control system among multiple converter valve submodules in the valve section, and the second converter valve submodule is other converter valve submodules in the valve section except the first converter valve submodule; the valve control system receives the fault status frames sent by the first converter valve submodule in each valve section in a time-sharing manner, and the multiple fault status frames include the fault status frame of the first converter valve submodule itself and the fault status frame sent by the second converter valve submodule to the first converter valve submodule.

[0016] Optionally, the valve control system includes a first valve base control device and a second valve base control device; the steps of the valve control system sending control frames to the first converter valve submodules in the m-level valve section respectively include: the first valve base control device sends control frames to the first converter valve submodules in the m-level first valve section respectively; when a communication failure occurs between the first valve base control device and the m-level first valve section, the second valve base control device sends control frames to the first converter valve submodules in the m-level first valve section respectively.

[0017] Optionally, the step of the valve control system receiving the fault status frame sent by the first converter valve submodule in each valve section in a time-sharing manner includes: the first valve base control device and the second valve base control device both receive the fault status frame sent by the first converter valve submodule in the valve section in a time-sharing manner.

[0018] According to a third aspect of the present application, there is also provided a flexible direct current transmission converter valve submodule networking communication method, which is applied to the valve section in the flexible direct current transmission converter valve submodule networking system of any of the above-mentioned embodiments, and the communication method comprises: a first converter valve submodule in the valve section receives a control frame sent by a valve control system, and the first converter valve submodule is a converter valve submodule among multiple converter valve submodules in the valve section that is communicatively connected to the valve control system; the first converter valve submodule transparently transmits the control frame to a second converter valve submodule that is communicatively connected to the first converter valve submodule, and an upper-level valve section or a lower-level valve section, and the second converter valve submodule is other converter valve submodules in the valve section except the first converter valve submodule; multiple second converter valve submodules in the valve section transparently transmit the fault status frame to the first converter valve submodule in a time-sharing manner; the first converter valve submodule transparently transmits its own fault status frame and the received fault status frame to the valve control system respectively.

[0019] Optionally, the step of the first converter valve submodule transparently transmitting the control frame to the second converter valve submodule communicatively connected to the first converter valve submodule, and the upper-level valve section or the lower-level valve section includes: the converter valve submodule transparently transmitting the control frame received by the port with the highest priority to other converter valve submodules and the upper-level valve section or the lower-level valve section; the converter valve submodule discards the control frame received by other ports except the port with the highest priority.

[0020] Optionally, before the step of transparently transmitting the fault status frame to the first converter valve sub-module in a time-sharing manner in the multiple second converter valve sub-modules in the valve section, the communication method also includes: the converter valve sub-module determines whether the communication with other converter valve sub-modules is faulty based on whether it has received a control frame sent by other converter valve sub-modules that are communicatively connected to the converter valve sub-module, and obtains a communication status determination result, and the converter valve sub-module is the first converter valve sub-module or the second converter valve sub-module; the converter valve sub-module writes the communication status determination result into the fault status frame.

[0021] Optionally, the step of transparently transmitting the fault status frame to the first converter valve submodule in a time-sharing manner by multiple second converter valve submodules in the valve section includes: after the second converter valve submodule starts a preset delay time at the moment of receiving the control frame, transparently transmitting the pre-written fault status frame to the first converter valve submodule or other second converter valve submodules communicatively connected to the second converter valve submodule, and each second converter valve submodule corresponds to a different preset delay time; after the first converter valve submodule receives the fault status frame sent by other converter valve submodules, the first converter valve submodule transparently transmits the fault status frame to the valve control system.

[0022] Compared with the prior art, the beneficial effects of this application are:

[0023] In the flexible direct current transmission converter valve submodule networking system provided by the present application, since the first valve base control device in the valve control system is connected to some of the multiple valve sections in communication, and the number of valve sections connected to the first valve base control device is greater than or equal to 2. That is to say, the number of valve sections connected to the first valve base control device in communication is greater than or equal to 2, and is less than the total number of valve sections. The communication distance between the first valve base control device and at least one converter valve submodule of the partial valve section is greater than the communication distance between the multiple converter valve submodules in the valve section, that is, the first valve base control device is connected to the valve section in communication through a long-distance optical fiber. Compared with the prior art in which each valve base control device is connected to each valve section in communication through a long-distance optical fiber, the present application can reduce the number of long-distance optical fibers, thereby reducing the number and volume of valve base control device cabinets, and thus will not increase the difficulty of the construction and subsequent maintenance of the converter station.

[0024] In addition, multiple valve sections are cascaded in sequence, and each valve section includes multiple converter valve submodules arranged in a matrix, and each adjacent converter valve submodule is connected in communication. In this way, on the one hand, the first valve base control device can send a control frame to the converter valve submodule in the valve section that is connected in communication with the first valve base control device, and the converter valve submodule transparently transmits the control frame to other converter valve submodules in the same valve section and other valve sections cascaded with the valve section, such as the next valve section. Compared with the technical solution in the prior art that the valve base control device is only connected in communication with one valve section, and the valve section needs to transparently transmit the control frame to each converter valve submodule one by one after receiving the control frame sent by the valve base control device, the present application can make the control frame reach each converter valve submodule after a relatively small number of transparent transmissions. Therefore, the control frame sent by the first valve base control device in the present application can quickly reach each converter valve submodule, thereby improving the data interaction efficiency between the valve control system and the converter valve submodule. On the other hand, each converter valve submodule establishes a communication connection with at least a plurality of surrounding submodules, and the communication redundancy between the converter valve submodules is greatly improved, thereby improving the communication reliability.

[0025] That is to say, in the present application, while reducing the number of long-distance optical fibers, the communication redundancy and the data interaction efficiency between the valve control system and the converter valve submodule can also be improved.

[0026] In the flexible direct current transmission converter valve submodule networking communication method provided by the present application, the valve control system sends control frames to the first converter valve submodules in the m-level valve section respectively. After receiving the control frames, the first converter valve submodule in the m-level valve section can transparently transmit the control frames to the second converter valve submodule that is communicatively connected to the first converter valve submodule, and the upper-level valve section or the lower-level valve section. Compared with the technical solution in the prior art, in which the valve base control device is only communicatively connected to one valve section, and the valve section needs to transparently transmit to each converter valve submodule one by one after receiving the control frame sent by the valve base control device, the present application can make the control frame reach each converter valve submodule after a relatively small number of transparent transmissions. Therefore, the control frame sent by the first valve base control device in the present application can quickly reach each converter valve submodule, thereby improving the data interaction efficiency between the valve control system and the converter valve submodule.

[0027] In addition, the valve control system can receive multiple fault status frames sent by the first converter valve submodule in each valve section in a time-sharing manner, and the multiple fault status frames include the fault status frame of the first converter valve submodule itself and the fault status frame sent by the second converter valve submodule to the first converter valve submodule. Therefore, in the uplink communication, the second converter valve submodule can send the fault status frame to the first converter valve submodule in the same valve section, and then directly transparently transmit it to the valve control system through the first converter valve submodule, thereby reducing the number of transparent transmissions of each fault status frame and the transparent transmission time of each fault status frame, thereby improving the data interaction efficiency between the valve control system and the converter valve submodule.

[0028] In the flexible direct current transmission converter valve submodule networking communication method provided by the present application, the first converter valve submodule receives the control frame sent by the valve control system, and transparently transmits the control frame to the second converter valve submodule that is communicatively connected to the first converter valve submodule, and the upper-level valve section or the lower-level valve section. Compared with the technical solution in the prior art, in which the valve base control device is only communicatively connected to one valve section, and the valve section needs to transparently transmit to each converter valve submodule one by one after receiving the control frame sent by the valve base control device, the present application enables the control frame to reach each converter valve submodule after a relatively small number of transparent transmissions. Therefore, the control frame sent by the first valve base control device in the present application can quickly reach each converter valve submodule, thereby improving the data interaction efficiency between the valve control system and the converter valve submodule.

[0029] In addition, multiple second converter valve sub-modules in the valve section can transparently transmit the fault status frame to the first converter valve sub-module in a time-sharing manner, and the first converter valve sub-module can directly transparently transmit its own fault status frame and the received fault status frame to the valve control system, thereby reducing the number of transparent transmissions of each fault status frame and the transparent transmission duration of each fault status frame, thereby improving the data interaction efficiency between the valve control system and the converter valve sub-module. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A topological structure diagram of a flexible DC transmission converter valve submodule networking system in one embodiment of the present application;

[0031] Figure 2 for Figure 1 A schematic diagram of the structure of a control frame sent by a valve control system of a flexible DC transmission converter valve submodule networking system shown;

[0032] Figure 3 For application Figure 1 A flow chart of a flexible DC transmission converter valve submodule networking communication method of a valve control system of a flexible DC transmission converter valve submodule networking system shown;

[0033] Figure 4 for Figure 1 A schematic diagram of the structure of a fault status frame sent by a converter valve submodule of a flexible DC transmission converter valve submodule networking system is shown;

[0034] Figure 5 For application Figure 1 A schematic flow chart of a flexible direct current transmission converter valve submodule networking communication method of a valve section of a flexible direct current transmission converter valve submodule networking system shown;

[0035] Figure 6 It is a specific schematic diagram of sending control frames and sending fault status frames in different time periods within a communication cycle;

[0036] Figure 7 for Figure 1 A schematic diagram of the priorities of multiple ports of a converter valve submodule of a flexible DC transmission converter valve submodule networking system is shown;

[0037] Figure 8 For application Figure 1 The flowchart of the communication fault determination method of the flexible DC transmission converter valve submodule networking system is shown. DETAILED DESCRIPTION

[0038] Embodiment 1:

[0039] In order to solve the problems of huge long-distance optical fiber in the existing technology, which makes the construction and subsequent maintenance of converter stations difficult, and the problem of low communication redundancy, such as Figure 1As shown, an embodiment of the present application provides a flexible direct current transmission converter valve submodule networking system. The flexible direct current transmission converter valve submodule networking system may include: a valve control system 1, the valve control system 1 includes a first valve base control device VBC-A (valve base controller, VBC) and a multi-stage valve section cascaded in sequence. Exemplarily, in this embodiment, the flexible direct current transmission converter valve submodule networking system may include 2m-stage valve sections, namely valve section S (1), valve section S (2), valve section S (3) ... valve section S (2m-2), valve section S (2m-1) and valve section S (2m). The first valve base control device VBC-A is communicatively connected to at least one converter valve submodule SM in a part of the valve sections S in the multi-stage valve sections S, and the number of valve sections S connected to the first valve base control device VBC-A is greater than or equal to 2. The communication distance between the first valve base control device VBC-A and at least one converter valve submodule SM in the part of the valve section S is greater than the communication distance between multiple converter valve submodules in the valve section.

[0040] like Figure 1 As shown, each valve stage includes a plurality of converter valve submodules arranged in a matrix, and each two adjacent converter valve submodules are in communication connection. Figure 1 As shown, each valve stage S includes n converter valve submodules SM, namely converter valve submodules SM(1), SM(2), SM(3), SM(4), SM(5), SM(6) ... SM(n-1), SM(n), and the n converter valve submodules SM are arranged in an array of (n / 2)×2, and the two converter valve submodules SM in each row are connected to each other for communication, and the converter valve submodules SM in two adjacent rows are also connected to each other for communication, for example, the converter valve submodules SM(1) and SM(3) are connected to each other for communication, and the converter valve submodules SM(2) and SM(4) are connected to each other for communication, etc.

[0041] Compared with the prior art, the beneficial effects of the embodiments of the present application are:

[0042] In the flexible direct current transmission converter valve submodule networking system provided by the embodiment of the present application, since the first valve base control device VBC-A in the valve control system 1 is connected to some of the valve segments S among the multiple valve segments S in communication, and the number of valve segments S connected to the first valve base control device VBC-A is greater than or equal to 2. That is to say, the number of valve segments S connected to the first valve base control device VBC-A in communication is greater than or equal to 2, and is less than the total number of valve segments S. The communication distance between the first valve base control device VBC-A and at least one converter valve submodule SM of some valve segments S is greater than the communication distance between the multiple converter valve submodules SM in the valve segment S, that is, the first valve base control device VBC-A is connected to the valve segment S in communication through a long-distance optical fiber. Compared with the prior art in which each valve base control device is connected to each valve segment S in communication through a long-distance optical fiber, the present application can reduce the number of long-distance optical fibers, thereby reducing the number and volume of valve base control device cabinets, and thus will not increase the difficulty of the construction and subsequent maintenance of the converter station.

[0043] In addition, multiple valve sections S are cascaded in sequence, and each valve section S includes multiple converter valve submodules SM arranged in a matrix, and each adjacent converter valve submodule SM is connected in communication. In this way, on the one hand, the first valve base control device VBC-A can send a control frame to the converter valve submodule SM in the valve section S that is connected in communication with the first valve base control device VBC-A, and the converter valve submodule SM transparently transmits the control frame to other converter valve submodules SM in the same valve section S and other valve sections S cascaded with the valve section S. Compared with the technical solution in the prior art that the valve base control device is only connected in communication with one valve section S, and the valve section S needs to transparently transmit the control frame to each converter valve submodule SM one by one after receiving the control frame sent by the valve base control device, the present application can make the control frame reach each converter valve submodule SM after a relatively small number of transparent transmissions. Therefore, the control frame sent by the first valve base control device VBC-A in the present application can quickly reach each converter valve submodule SM, thereby improving the data interaction efficiency between the valve control system 1 and the converter valve submodule SM. On the other hand, each converter valve submodule SM establishes a communication connection with at least a plurality of surrounding converter valve submodules SM, and the communication redundancy between the converter valve submodules SM is greatly improved, thereby improving the communication reliability.

[0044] That is to say, in the present application, while reducing the number of long-distance optical fibers, the data interaction efficiency between the valve control system 1 and the converter valve sub-module SM can also be improved.

[0045] Optionally, the control frame may include: control instruction segments that are consistent with the number of converter valve submodules SM in the valve segment, and each control instruction segment corresponds to one converter valve submodule SM. In other words, each control instruction segment corresponds to each converter valve submodule SM. In this way, when the first valve base control device VBC-A sends the control instruction to the converter valve submodule SM in a part of the valve segment S, the converter valve submodule SM may transparently transmit the control frame to other converter valve submodules SM in the same valve segment S, and each converter valve submodule SM may extract the corresponding control instruction segment and execute it after receiving the control frame.

[0046] Alternatively, if Figure 2 As shown in FIG. 1 , the control frame also includes a frame header and a cyclic redundancy check (CRC). Each control instruction segment is located between the frame header and the CRC. The frame header and the CRC can be used as the start mark and the end mark of the control frame. The content of the frame header can usually be determined by the communication requirements of the flexible DC transmission converter valve submodule networking system. The CRC can be used to verify the control frame at the sending end and the receiving end.

[0047] Alternatively, if Figure 1 As shown, the flexible direct current transmission converter valve submodule networking system includes 2m valve sections S, and the 2m valve sections S include m first valve sections SA and m second valve sections SB; the valve control system 1 also includes a second valve base control device VBC-B, the first valve base control device VBC-A is respectively connected to the m first valve sections SA for communication, and the second valve base control device VBC-B is respectively connected to the m second valve sections SB for communication. The first valve base control device VBC-A and the second valve base control device VBC-B can be redundant valve base control devices to each other, that is, in one communication cycle, one of the valve base control devices can send a control frame to the valve section S, and illustratively, the first valve base control device VBC-A sends a control frame to the m first valve sections SA. Since the 2m valve sections S are cascaded in sequence, when the m first valve sections SA receive the control frame, the control frame can be transparently transmitted to the m second valve sections SB. If the communication between the first valve base control device VBC-A and the valve section S fails, the second valve base control device VBC-B will be switched to send control frames to the valve section S. Since the 2m valve sections S are cascaded in sequence, when the m second valve sections SB receive the control frame, the control frame can be transparently transmitted to the m first valve sections SA, so that the control frame can reach all valve sections S. In this way, when the communication between one of the valve base control devices and the m valve sections S fails, the other valve base control devices can send control frames to the valve section S, thereby improving the reliability of communication.

[0048] Alternatively, if Figure 1 As shown, the flexible DC transmission converter valve submodule networking system also includes m pairs of first optical transceivers VBC-A, exemplarily, as Figure 1As shown, the m pairs of first optical transceivers are respectively the first optical transceivers VBC-A(1), VBC-A(2) ... VBC-A(k) ... VBC-A(m). One end of the m pairs of first optical transceivers VBC-A are connected to the first valve base control device VBC-A, and the other ends of the m pairs of first optical transceivers VBC-A are respectively connected to the m first valve sections SA.

[0049] like Figure 1 As shown, the flexible DC transmission converter valve submodule networking system also includes m pairs of second optical transceivers VBC-B, exemplarily, as Figure 1 As shown, the m pairs of first optical transceivers are respectively the first optical transceivers VBC-B(1), VBC-B(2) ... VBC-B(k) ... VBC-B(m). One end of the m pairs of second optical transceivers VBC-B are connected to the second valve base control device VBC-B, and the other ends of the m pairs of second optical transceivers VBC-B are respectively connected to the m second valve sections SB.

[0050] In this way, the first valve base control device VBC-A can send control frames to the m first valve sections SA respectively through the m pairs of first optical transceivers, thereby ensuring the consistency of data transmission and reception in the m pairs of first optical transceivers VBC-A. The second valve base control device VBC-B can send control frames to the m second valve sections SB respectively through the m pairs of second optical transceivers VBC-B, thereby ensuring the consistency of data transmission and reception in the m pairs of second optical transceivers VBC-B.

[0051] Optionally, the m first valve sections SA are all odd-numbered valve sections S, and the m second valve sections SB are all even-numbered valve sections S. That is to say, the m first valve sections SA and the m second valve sections SB are alternately arranged in sequence, or it can be said that the valve control system 1 is connected to the multi-stage valve sections S in equal intervals. Therefore, after the first valve base control device VBC-A sends control frames to the m first valve sections SA respectively, the m first valve sections SA can transparently transmit the adjacent second valve sections SB after receiving the control frames, so that the control frames can quickly reach the second valve sections SB, thereby improving the data interaction efficiency between the valve control system 1 and the converter valve submodule SM. If the current communication cycle is for the second valve section SB to send control frames, the data interaction efficiency between the valve control system 1 and the converter valve submodule SM can also be improved.

[0052] Optionally, except for the last valve segment S, the last row of the converter valve submodules SM of the other valve segments S are all in communication connection with the first row of the converter valve submodules SM in the next valve segment S. For example, Figure 1As shown, the converter valve submodule SM(n-1) in the first valve segment S(1) is connected to the converter valve submodule SM(1) in the second valve segment S(2), and the converter valve submodule SM(n) in the first valve segment S(1) is connected to the converter valve submodule SM(2) in the second valve segment S(2). In this way, each row of converter valve submodules SM in the 2m valve segments S is cascaded in sequence, thereby realizing the cascade connection between the valve segments S.

[0053] Alternatively, if Figure 1 As shown, the first valve base control device VBC-A is in communication connection with the converter valve submodule SM in the first valve section SA connected to the next valve section S. For example, Figure 1 As shown, the first valve base control device VBC-A is in communication connection with the converter valve submodule SM(n-1) in the first valve segment S(1), the converter valve submodule SM(n-1) in the first valve segment S(3), and the converter valve submodule SM(n-1) in the first valve segment S(2m-1). In this way, after the first valve base control device VBC-A sends a control frame to the converter valve submodule SM in the first valve segment SA, the converter valve submodule SM can directly transparently transmit the control frame to the next-level valve segment S without multiple transparent transmissions, thereby reducing the number of transparent transmissions and further increasing the rate at which the next-level valve segment receives the control frame.

[0054] Alternatively, if Figure 1 As shown, the second valve base control device VBC-B is in communication connection with the converter valve submodule SM in the second valve segment SB that is connected to the upper valve segment S. Exemplarily, the second valve base control device VBC-B is in communication connection with the converter valve submodule SM(2) in the second valve segment S(2), the converter valve submodule SM(2) in the second valve segment S(2m-2), and the converter valve submodule SM(2) in the second valve segment S(2m). In this way, after the second valve base control device VBC-B sends a control frame to the converter valve submodule SM in the second valve segment SB, the converter valve submodule SM can directly transparently transmit the control frame to the upper valve segment S without multiple transparent transmissions, thereby reducing the number of transparent transmissions and further improving the efficiency of the next valve segment receiving the control frame.

[0055] Optionally, the first valve base control device VBC-A is connected to the converter valve submodule SM in the first valve section SA that is connected to the next valve section S and located in the first column, and the second valve base control device VBC-B is connected to the converter valve submodule SM in the second valve section SB that is connected to the previous valve section S and located in the last column. For example, Figure 1As shown, the converter valve submodule SM(n-1) in each first valve segment SA is located in the first column, then the first valve base control device VBC-A is respectively connected to the converter valve submodule SM(n-1) in each first valve segment SA. The converter valve submodule SM(2) in each second valve segment SB is respectively connected to the converter valve submodule SM(2) in each second valve segment SB. Therefore, when the converter valve submodule SM in the first column of the first valve segment SA fails, the second valve base control device VBC-B can send a control frame to the converter valve submodule SM in the last column of the second valve segment SB, and the converter valve submodule SM completes the transparent transmission of the control frame, thereby improving the reliability of communication.

[0056] Embodiment 2:

[0057] Based on the same inventive concept, this embodiment also provides a flexible DC transmission converter valve submodule networking communication method, which is applied to Figure 1 The valve control system in the flexible DC transmission converter valve submodule networking system shown in FIG. Figure 3 As shown, the flexible DC transmission converter valve submodule networking communication method includes:

[0058] S31, the valve control system 1 sends control frames to the first converter valve submodules SM in the m-stage valve section S respectively.

[0059] In this way, after receiving the control frame, the first converter valve submodule SM in the m-level valve section S can transparently transmit the control frame to the second converter valve submodule SM that is communicatively connected to the first converter valve submodule SM, and the upper-level valve section S or the lower-level valve section S. In this embodiment, the first converter valve submodule SM is a converter valve submodule SM that is communicatively connected to the valve control system 1 among the multiple converter valve submodules SM in the valve section S, and the second converter valve submodule SM is other converter valve submodules SM in the valve section S except the first converter valve submodule SM. Exemplarily, for the valve section S(1), the first converter valve submodule SM can be SM(n-1), and the second converter valve submodule SM can be other converter valve submodules in the valve section S(1) except SM(n-1), for example, SM(1)-SM(n-2) and SM(n). For valve section S(2), the first converter valve submodule SM may be SM(2), and the second converter valve submodule SM may be other converter valve submodules in valve section S(2) except SM(2), for example, SM(1), SM(3)-SM(n). It can be understood that the control frame includes the control instruction segment of each converter valve submodule SM in all valve sections S.

[0060] like Figure 1As shown, the valve control system 1 can send control frames to the converter valve submodule SM(n-1) in the first valve section S(1), the converter valve submodule SM(n-1) in the first valve section S(3) ... and the converter valve submodule SM(n-1) in the first valve section S(2n-1). Alternatively, the valve control system 1 can send control frames to the converter valve submodule SM(2) in the second valve section S(2), the converter valve submodule SM(2) in the second valve section S(4) ... and the converter valve submodule SM(2) in the second valve section S(2n).

[0061] S32, the valve control system 1 receives the fault status frame sent by the first converter valve submodule SM in each valve section S in a time-sharing manner.

[0062] The second converter valve submodule SM in each valve section S can send its own fault status frame to the first converter valve submodule SM in a time-sharing manner, and the first converter valve submodule SM sends its own status information and the received fault status frame to the valve control system 1. Therefore, the valve control system 1 can receive the fault status frame sent by the first converter valve submodule SM in each valve section S in a time-sharing manner. Figure 4 As shown, the fault status frame may include a frame header, a flag bit, a communication status determination result, and a CRC.

[0063] Alternatively, if Figure 1 As shown, the valve control system 1 includes a first valve base control device VBC-A and a second valve base control device VBC-B. Figure 3 In step S1 of the process shown, the valve control system 1 sends control frames to the first converter valve submodules SM in the M-level valve sections S respectively, including:

[0064] The first valve base control device VBC-A sends control frames to the first converter valve submodules SM in the m-level first valve section SA respectively. In the case of a communication failure between the first valve base control device VBC-A and the M-level first valve section SA, the second valve base control device VBC-B sends control frames to the first converter valve submodules SM in the M-level first valve section SA respectively. That is to say, in this embodiment, when the flexible DC power transmission converter valve submodule networking system operates normally, in the downlink communication path, only one valve base control device in the valve control system 1 is in the main state, and the other valve base control device is in the standby state. For example, when the first valve base control device VBC-A is in the main state, the second valve base control device VBC-B is in the standby state. Or, when the second valve base control device VBC-B is in the main state, the first valve base control device VBC-A is in the standby state. Moreover, only the valve base control device in the main state has control authority over each converter valve submodule SM. That is to say, all downlink optical fibers of the valve base control device in the main state send control frames. As a result, the first valve base control device VBC-A and the second valve base control device VBC-B are redundant with each other, thereby improving communication reliability.

[0065] Optionally, Figure 3 Step S2 of the process shown, the step in which the valve control system 1 receives the fault status frame sent by the first converter valve sub-module SM in each valve section S in a time-sharing manner, includes: the first valve base control device VBC-A and the second valve base control device VBC-B both receive the fault status frame sent by the first converter valve sub-module SM in the valve section S in a time-sharing manner.

[0066] Therefore, in the uplink communication path, the valve base control device in the active state and the valve base control device in the standby state both receive the fault status frame of each valve section S. Therefore, even if the communication between one of the valve base control devices and each valve section S fails, the other valve base control device can still receive the fault status frame, so this embodiment can improve communication reliability.

[0067] Embodiment 3:

[0068] Based on the same inventive concept, this embodiment also provides a flexible DC transmission converter valve submodule networking communication method, which can be applied to Figure 1 The valve section in the flexible DC transmission converter valve submodule networking system shown in FIG. Figure 5 As shown, the flexible DC transmission converter valve submodule networking communication method may include:

[0069] S51 , the first converter valve submodule SM in the valve section S receives a control frame sent by the valve control system 1 .

[0070] In this embodiment, if Figure 1As shown, the first converter valve submodule SM is a converter valve submodule SM in the valve section S that is communicatively connected to the valve control system 1 among the multiple converter valve submodules SM in the valve section S. That is, the first converter valve submodule may be the converter valve submodule SM(n-1) in the valve section S(1), the converter valve submodule SM(n-1) in the valve section S(3), and the converter valve submodule SM(n-1) in the valve section S(2m-1), which are respectively communicatively connected to the first valve base control device VBC-A. The first converter valve submodule may also be the converter valve submodule SM(2) in the valve section S(2), the converter valve submodule SM(2) in the valve section S(4), and the converter valve submodule SM(2) in the valve section S(2m), which are respectively communicatively connected to the second valve base control device VBC-B.

[0071] It is understandable that if Figure 6 As shown, in one communication cycle (0-T3 time period), it may include the downlink communication time period between 0-T1, the uplink communication time period between T1-T2, and the time period between T2-T3. Among them, time 0 is the synchronization reference time of each converter valve submodule, and may also be the time when the first converter valve submodule receives the control frame for the first time.

[0072] S52, the first converter valve submodule SM transparently transmits the control frame to the second converter valve submodule SM, which is communicatively connected to the first converter valve submodule SM, and the upper-level valve section S or the lower-level valve section S.

[0073] In this embodiment, the second converter valve submodule SM is other converter valve submodules SM in the valve section S except the first converter valve submodule SM. That is to say, after receiving the control frame, the first converter valve submodule SM can transparently transmit the control frame to other converter valve submodules SM located in the same valve section and connected to itself for communication, as well as the upper-level valve section S or the lower-level valve section S. For example, Figure 1 As shown, after receiving the control frame, the converter valve submodule SM(n-1) in the valve section S(1) can first copy a copy and save it locally, and then transparently transmit the control frame to the converter valve submodule SM(n) in the valve section S(1), the converter valve submodule SM(n-3) and the converter valve submodule SM(1) in the valve section S(2).

[0074] After receiving the control frame, the second converter valve submodule SM can continue to transparently transmit the control frame to other converter valve submodules SM until the control frame reaches all converter valve submodules SM. In this embodiment, the flexible DC transmission converter valve submodule networking system includes multiple valve sections S, and the control frame sent by the valve control system 1 can be quickly transmitted to all converter valve submodules SM in the nearby valve section S through the converter valve submodule SM that is communicatively connected to the valve control system 1, and the control frame reception delay between different converter valve submodules SM can be controlled within 1us.

[0075] like Figure 6 As shown, in the time period 0-T1, after receiving the control frame, the first converter valve submodule SM starts transparent transmission and executes the specific content of the instruction.

[0076] S53, the multiple second converter valve sub-modules SM in the valve section S transparently transmit the fault status frame to the first converter valve sub-module SM in a time-sharing manner.

[0077] like Figure 6 As shown, starting from time T1, multiple second converter valve submodules SM transparently transmit the fault status frame to the first converter valve submodule SM in a time-sharing manner. Figure 1 As shown, for valve section S(1), the converter valve submodule SM(n-1) is the first converter valve submodule, and the converter valve submodules SM(1)-SM(n-2) and SM(n) are the second converter valve submodules. Then, the converter valve submodules SM(1)-SM(n-2) and SM(n) can send their respective fault status frames to the converter valve submodule SM(n-1) in a time-sharing manner. After receiving the fault status frame, the converter valve submodule SM(n-1) can transparently transmit the fault status frame to the first valve base control device VBC-A.

[0078] S54 , the first converter valve submodule SM transparently transmits its own fault status frame and the received fault status frame to the valve control system 1 .

[0079] After receiving the fault status frame sent by the converter valve sub-modules SM(1)-SM(n-2) and SM(n), the converter valve sub-module SM(n-1) can transparently transmit its own fault status frame and the received fault status frame to the valve control system 1, specifically to the first valve base control device VBC-A.

[0080] Alternatively, if Figure 7 As shown, each converter valve submodule SM includes four ports, namely R1, R2, R3 and R4 with decreasing priorities. Among them, the preferred port for the interconnection channel between the submodule and the valve control can also be used as the first priority port for interconnection between submodules, port R2 is the second priority port for interconnection between submodules, port R3 is the third priority port for interconnection between submodules, and port R4 is the fourth priority port for interconnection between submodules. For example, Figure 1 As shown, for the converter valve submodule SM that is communicatively connected to the valve control system 1, port R1 is the port that is communicatively connected to the valve control system 1. Ports R2, R3, and R4 are ports that are communicatively connected to other converter valve submodules. For other converter valve submodules SM that are not communicatively connected to the valve control system 1, the port R1 with the highest priority may be the port with the shortest communication path from the valve control system 1 to the converter valve submodule SM.

[0081] Figure 5 In step S52 of the process shown, the first converter valve submodule SM transparently transmits the control frame to the second converter valve submodule SM that is communicatively connected to the first converter valve submodule SM, and the upper-level valve section S or the lower-level valve section S, including:

[0082] In the first step, the converter valve submodule SM transparently transmits the control frame received by the port with the highest priority to other converter valve submodules SM and the upper-level valve section S or the lower-level valve section S.

[0083] The converter valve submodule SM includes a field programmable gate array (FPGA). The FPGA can receive a control frame. If the control frame is received by the port with the highest priority, the control frame can be checked. After the check is successful, the control frame can be copied and transparently transmitted to other converter valve submodules SM and the upper-level valve section S or the lower-level valve section S.

[0084] Then the copied control frame is decoded, and the corresponding instruction is extracted and executed according to its own position number. Here, the position number of the converter valve submodule SM can be preset by the encoding switch or by the flash.

[0085] Other converter valve submodules SM that receive the control frame perform the same processing, that is, continue to transparently transmit to other converter valve submodules SM until the control frame reaches all converter valve submodules SM. It can be understood here that in the downlink communication mode, when different valve base control devices are in the master state, the time sequence of all ports in the converter valve submodule SM receiving the control frame may be different, that is, when the first valve base control device VBC-A is in the master state, the port with the highest priority receives the control frame first, and when the second valve base control device VBC-B is in the master state, the port with a lower priority receives the control frame first. Therefore, in other possible implementations, it is also possible to determine whether to transparently transmit according to the order in which the control frame is received, that is, the converter valve submodule SM that receives the control frame first transparently transmits the control frame, and the control frame received later is no longer transparently transmitted.

[0086] In the second step, the converter valve submodule SM discards the control frames received by the ports other than the port with the highest priority.

[0087] Since each converter valve submodule SM has four ports, all four ports may receive control frames, so the converter valve submodule SM may receive multiple identical control frames. By transparently transmitting the control frame received by the port with the highest priority, and discarding other received control frames, that is, no longer using other received control frames as valid instructions, but only as a basis for determining whether communication is normal, it can avoid the control frame from being infinitely looped and transparently transmitted in the flexible DC transmission converter valve submodule networking system, thereby wasting communication resources.

[0088] Optionally, in Figure 5 Before the step S53 of the process shown in the figure, in which the plurality of second converter valve submodules SM in the valve section S transparently transmit the fault status frame to the first converter valve submodule SM in a time-sharing manner, the communication method further includes:

[0089] In the first step, the converter valve submodule SM determines whether the communication with other converter valve submodules SM fails according to whether the control frame sent by other converter valve submodules SM that are communicatively connected to the converter valve submodule SM is received, and obtains the communication status determination result.

[0090] For example, Figure 1 As shown, for the converter valve submodule SM(n-1) in the valve section S(1), after receiving the control frame sent by the first valve base control device VBC-A, the control frame can be transparently transmitted to the converter valve submodule SM(n-3), SM(n) and the converter valve submodule SM(1) in the valve section S(2). After receiving the control frame, the converter valve submodule SM(n) and the converter valve submodule SM(1) in the valve section S(2) will transparently transmit it to the converter valve submodule SM(n-1). Therefore, the converter valve submodule SM(n-1) can determine whether the communication with the above three is faulty according to whether the control frame sent by the first valve base control device VBC-A, the converter valve submodule SM(n) and the converter valve submodule SM(1) in the valve section S(2) is received, thereby obtaining the communication status determination result. When a control frame sent by a certain device is received, it indicates that the communication with the device is normal. If a control frame sent by a certain device is not received, it indicates that the communication with the device is abnormal.

[0091] Here, the converter valve submodule SM is the first converter valve submodule SM or the second converter valve submodule SM. That is to say, all converter valve submodules SM can obtain the communication state determination result in the same way.

[0092] In the second step, the converter valve submodule SM writes the communication status determination result into the fault status frame.

[0093] After each converter valve submodule SM obtains the communication status determination result, the communication determination result can be written into the fault status frame. Thus, after receiving each fault status frame, the valve control system 1 can obtain the communication status between different converter valve submodules.

[0094] Optionally, Figure 5 In the process step S53 shown in the figure, the step of transparently transmitting the fault status frame to the first converter valve submodule SM in the valve section S in a time-sharing manner includes:

[0095] In the first step, after the second converter valve submodule SM receives the control frame and starts the preset delay time, it transparently transmits the pre-written fault status frame to the first converter valve submodule SM or other second converter valve submodules SM that are communicatively connected to the second converter valve submodule SM, and each second converter valve submodule SM corresponds to a different preset delay time.

[0096] Specifically, Figure 6 As shown, at time T1, the control frame has been sent down. After time T1, the stage of sending fault status frames begins. That is, the second converter valve submodule SM can send the fault status frame after a preset time period starting from the moment the control frame is first received. The preset delay time can be determined by the hardware delay of the control frame transparent transmission between the converter valve submodules SM and the transmission time of the control frame. During this time period, the control frame will be transmitted multiple times inside the flexible DC transmission converter valve submodule networking system. As shown Figure 6 As shown, each converter valve submodule SM sends a fault status frame at a different time, and there is a time gap between the sending times of every two adjacent converter valve submodules SM.

[0097] For example, if the telesignaling and telemetry data sent by a single converter valve submodule SM require 48 bits, plus the frame header and CRC check, the uplink data volume of a single converter valve submodule SM is 64 bits. If the communication rate is 100Mbps, the time required for sending the fault status frame of each converter valve submodule SM is t=64bit / 100Mbps=0.64us. Considering the hardware delay of transparent transmission between converter valve submodules SM, a time slot can be set between the sending times of two adjacent converter valve submodules SM in the uplink state, so that the time slot should be greater than 0.64us to ensure that the fault status frame of the converter valve submodule SM is not blocked. The sending time interval of the converter valve submodule SM is set to 1us. If the communication cycle between the valve control system 1 and the converter valve submodule SM is 50us, the flexible DC transmission converter valve submodule networking system can send up to 50 fault status frames of the converter valve submodule SM in one cycle, and the end time T2 of the completion of sending the fault status frames of all the converter valve submodules SM can be before the end time T3 of one communication cycle, so as to ensure that all fault status frames of the converter valve submodule SM are sent to the valve control system 1 within one communication cycle.

[0098] In the second step, after receiving the fault status frame sent by other converter valve sub-modules SM, the first converter valve sub-module SM transparently transmits the fault status frame to the valve control system 1.

[0099] The first converter valve submodule SM can upload its own fault status frame after its own fault status frame is written and when the upload time is reached. After receiving the fault status frame sent by other converter valve submodules, the fault status frame can be directly uploaded.

[0100] Moreover, as in the downlink communication process, each converter valve sub-module SM sends its own fault status frame to all converter valve sub-modules SM connected to it. The converter valve sub-module SM that receives the fault status frame can continue to transparently transmit the fault status frame to other converter valve sub-modules SM that are communicatively connected to it, until the fault status frames of all converter valve sub-modules SM are sent to the valve control system 1, completing the uploading process of the fault status frame.

[0101] Compared with the data volume of the downlink control frame, the uplink data volume composed of the fault status frames of each converter valve sub-module SM is larger. The flexible direct current transmission converter valve sub-module networking system of this embodiment includes multiple valve sections S, and each second converter valve sub-module SM in each valve section S can send its own fault status frame to the first converter valve sub-module SM, and the first converter valve sub-module SM sends it to the valve control system 1, so that the fault status frames of all converter valve sub-modules SM can be sent to the valve control system 1 in a shorter time, thereby improving the data interaction efficiency between the valve control system 1 and the converter valve sub-module SM.

[0102] In addition, if the valve control system 1 receives the bypass status information of a converter valve submodule SM, the valve control system 1 executes the bypass logic of the converter valve submodule SM. If the valve control system 1 does not receive the fault status frame of a converter valve submodule SM in multiple consecutive communication cycles, it is considered that the central control board of the converter valve submodule SM is powered off or other reasons cause the three-way uplink communication to fail, then the valve control system 1 sends the bypass instruction of the converter valve submodule SM and executes the corresponding submodule bypass logic at the same time.

[0103] The following is a description of the communication fault determination method between the converter valve submodules of this embodiment with a specific implementation method:

[0104] like Figure 8 As shown, the first valve base control device VBC-A sends the control frame to the first converter valve submodule SM that is communicatively connected thereto.

[0105] S81, the first converter valve submodule SM receives the control frame, copies the control frame and transparently transmits the control frame to the second converter valve submodule SM, the third converter valve submodule SM and the fourth converter valve submodule that are communicatively connected.

[0106] S82, the second converter valve submodule SM, the third converter valve submodule SM and the fourth converter valve submodule SM determine whether the communication with the first converter valve submodule SM fails according to whether a control frame sent by the first converter valve submodule SM is received.

[0107] For example, the converter valve submodule SM(2) of valve section S(2) receives the control frame sent by the second valve base control device VBC-B, and the converter valve submodule SM(2) copies and transparently transmits the control frame to the converter valve submodules SM(1) and SM(4) and the converter valve submodule SM(n) of valve section S(1). At the same time, the second valve base control device VBC-B also receives the control frame returned by the converter valve submodule SM(2) of valve section S(2). However, the second valve base control device VBC-B does not process the control frame after receiving it and directly discards it. The converter valve submodule SM(1) of valve section S(2) determines whether the communication between the converter valve submodule SM(1) and SM(2) is normal according to whether it can receive the control frame from the converter valve submodule SM(2). At the same time, the converter valve submodule SM(1) continues to send the frame instruction through all sending ports. At this time, SM(2) will also receive the control frame again, but SM(2) only executes the control frame received and verified for the first time, and the other control frames are used to determine whether the communication port is normal. The method for judging the optical fiber communication failure between other converter valve submodules SM is the same.

[0108] S83, the second converter valve submodule SM, the third converter valve submodule SM, and the fourth converter valve submodule SM transparently transmit and parse the control frame that first passes the check, and the control frame will be returned to the first converter valve submodule SM again. The first converter valve submodule SM determines whether the communication with the second converter valve submodule SM, the third converter valve submodule SM, and the fourth converter valve submodule SM is normal based on whether the control frame is received.

[0109] S84, each converter valve submodule SM writes the communication status determination result into the fault status frame, waits for the fault status frame sending time of the converter valve submodule to arrive, and sends the fault status frame of the converter valve submodule to the second valve base control device VBC-B.

[0110] After the converter valve submodule completes the communication fault judgment it receives, it writes it into the fault status frame it wants to send, and after waiting for the sending time to arrive, it returns the fault status frame to the valve control, and finally completes the judgment of the optical fiber communication fault inside the converter valve submodule. Figure 6 It is carried out during the time period from T0 to T1 when the control frame is sent.

[0111] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A flexible DC transmission converter valve submodule networking system, characterized in that: include: A valve control system, the valve control system comprising a first valve base control device; A plurality of valve sections cascaded in sequence, each of the valve sections comprising a plurality of converter valve submodules arranged in a matrix, and each two adjacent converter valve submodules are communicatively connected, the first valve base control device is communicatively connected to at least one converter valve submodule in some of the valve sections in the multi-stage valve sections, and the number of valve sections connected to the first valve base control device is greater than or equal to 2, and the communication distance between the first valve base control device and at least one converter valve submodule in the some of the valve sections is greater than the communication distance between the plurality of converter valve submodules in the valve section; The first valve base control device is used to send a control frame to at least one converter valve submodule in the partial valve section, so that the at least one converter valve submodule transparently transmits the control frame to other converter valve submodules in the same valve section and the valve section at the next level.

2. The flexible DC transmission converter valve submodule networking system according to claim 1 is characterized in that: The control frame includes: control instruction segments whose number is consistent with the number of converter valve submodules in the valve segment, and each control instruction segment corresponds to a converter valve submodule.

3. The flexible DC transmission converter valve submodule networking system according to claim 2 is characterized in that: The control frame also includes a frame header and a cyclic redundancy check CRC.

4. The flexible DC transmission converter valve submodule networking system according to claim 1, characterized in that: The flexible direct current transmission converter valve submodule networking system comprises 2m valve sections, wherein the 2m valve sections comprise m first valve sections and m second valve sections; The valve control system further includes a second valve base control device, wherein the first valve base control device is communicatively connected to the m first valve sections respectively, and the second valve base control device is communicatively connected to the m second valve sections respectively.

5. The flexible DC transmission converter valve submodule networking system according to claim 4 is characterized in that: The flexible direct current transmission converter valve submodule networking system further includes m pairs of first optical transceivers, one end of each of the m pairs of first optical transceivers is connected to the first valve base control device, and the other ends of the m pairs of first optical transceivers are respectively connected to m first valve sections; The flexible direct current transmission converter valve submodule networking system also includes m pairs of second optical transceivers, one ends of the m pairs of second optical transceivers are connected to the second valve base control device, and the other ends of the m pairs of second optical transceivers are respectively connected to m second valve sections.

6. The flexible DC transmission converter valve submodule networking system according to claim 4 or 5, characterized in that: The m first valve sections are all odd-numbered valve sections, and the m second valve sections are all even-numbered valve sections.

7. The flexible DC transmission converter valve submodule networking system according to claim 4 or 5, characterized in that: Except for the valve section of the last stage, the last row of the converter valve submodules of the other valve sections are all communicatively connected with the first row of the converter valve submodules in the valve section of the next stage.

8. The flexible DC transmission converter valve submodule networking system according to claim 7, characterized in that: The first valve base control device is communicatively connected to a converter valve submodule in the first valve section that is connected to the valve section of the next level.

9. The flexible DC transmission converter valve submodule networking system according to claim 7, characterized in that: The second valve base control device is communicatively connected to a converter valve submodule in the second valve section that is connected to an upper-level valve section.

10. The flexible DC transmission converter valve submodule networking system according to claim 8 or 9, characterized in that: The first valve base control device is communicatively connected to the converter valve submodule in the first valve section that is connected to the valve section of the next level and is located in the first column, and the second valve base control device is communicatively connected to the converter valve submodule in the second valve section that is connected to the valve section of the previous level and is located in the last column.

11. A flexible DC transmission converter valve submodule networking communication method, characterized in that: The valve control system applied to the flexible DC transmission converter valve submodule networking system according to any one of claims 1 to 10, wherein the communication method comprises: The valve control system sends control frames to the first converter valve submodules in the m-level valve section respectively, so that after receiving the control frames, the first converter valve submodule in the m-level valve section transparently transmits the control frames to the second converter valve submodule communicatively connected to the first converter valve submodule, and the upper-level valve section or the next-level valve section, the first converter valve submodule is a converter valve submodule communicatively connected to the valve control system among the multiple converter valve submodules in the valve section, and the second converter valve submodule is other converter valve submodules in the valve section except the first converter valve submodule; The valve control system receives a plurality of fault status frames sent in a time-sharing manner by the first converter valve submodule in each of the valve sections, wherein the plurality of fault status frames include a fault status frame of the first converter valve submodule itself and a fault status frame sent by the second converter valve submodule to the first converter valve submodule.

12. The communication method according to claim 11, characterized in that: The valve control system includes a first valve base control device and a second valve base control device; The step of the valve control system sending control frames to the first converter valve submodules in the m-level valve section respectively includes: The first valve base control device sends the control frame to the first converter valve submodules in the m-level first valve section respectively; In the case that a communication failure occurs between the first valve base control device and the m-level first valve section, the second valve base control device sends control frames to the first converter valve submodules in the m-level first valve section respectively.

13. The communication method according to claim 12, characterized in that: The step of the valve control system receiving the fault status frame sent by the first converter valve submodule in each valve section in a time-sharing manner comprises: The first valve base control device and the second valve base control device both receive the fault status frame sent by the first converter valve submodule in the valve section in a time-sharing manner.

14. A flexible DC transmission converter valve submodule networking communication method, characterized in that: Applied to the valve section in the flexible DC transmission converter valve submodule networking system according to any one of claims 1 to 10, the communication method comprises: The first converter valve submodule in the valve section receives a control frame sent by the valve control system, wherein the first converter valve submodule is a converter valve submodule in the valve section that is communicatively connected to the valve control system. The first converter valve submodule transparently transmits the control frame to a second converter valve submodule that is communicatively connected to the first converter valve submodule, and an upper-level valve section or a lower-level valve section, wherein the second converter valve submodule is another converter valve submodule in the valve section except the first converter valve submodule; The plurality of the second converter valve submodules in the valve section transparently transmit the fault status frame to the first converter valve submodule in a time-sharing manner; The first converter valve submodule transparently transmits its own fault status frame and the received fault status frame to the valve control system.

15. The communication method according to claim 14, characterized in that: The step of the first converter valve submodule transparently transmitting the control frame to a second converter valve submodule communicatively connected to the first converter valve submodule, and an upper-level valve section or a lower-level valve section includes: The converter valve submodule transparently transmits the control frame received by the port with the highest priority to the other converter valve submodules and the upper-level valve section or the lower-level valve section; The converter valve submodule discards the control frames received by other ports except the port with the highest priority.

16. The communication method according to claim 14, characterized in that: Before the step of transparently transmitting the fault status frame to the first converter valve submodule in a time-sharing manner by the plurality of the second converter valve submodules in the valve section, the communication method further includes: The converter valve submodule determines whether the communication with other converter valve submodules is faulty according to whether the control frame sent by other converter valve submodules that are communicatively connected to the converter valve submodule is received, and obtains a communication status determination result, wherein the converter valve submodule is the first converter valve submodule or the second converter valve submodule; The converter valve submodule writes the communication status determination result into the fault status frame.

17. The communication method according to claim 14, characterized in that: The step of transparently transmitting the fault status frame to the first converter valve submodule in a time-sharing manner by the plurality of the second converter valve submodules in the valve section includes: After the second converter valve submodule receives the control frame and starts the preset delay time, the pre-written fault status frame is transparently transmitted to the first converter valve submodule or other second converter valve submodules that are communicatively connected to the second converter valve submodule, and each second converter valve submodule corresponds to a different preset delay time; After receiving the fault status frame sent by other converter valve submodules, the first converter valve submodule transparently transmits the fault status frame to the valve control system.

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