A flexible DC transmission control system

Abstract

This invention discloses a flexible DC transmission control system, including a first control module and a second control module. The first control module is connected to at least one first sub-module, and the second control module is connected to at least one second sub-module. The first and second sub-modules are connected in a one-to-one correspondence. The first control module can send first transmission data to the first sub-module, the first sub-module can send first transmission data to the second sub-module, the second control module can send second transmission data to the second sub-module, the second sub-module can send second transmission data to the first sub-module, the first sub-module can upload third transmission data to the first control module, the second sub-module can send second feedback data to the first sub-module, the second sub-module can upload fourth transmission data to the second control module, and the first sub-module can send first feedback data to the second sub-module. This design improves operational reliability and significantly enhances safety performance.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment, and in particular to a flexible DC power transmission control system. Background Technology

[0002] Flexible DC transmission has wide applications in offshore wind power, isolated island power transmission, and new energy fields. Among them, the flexible DC transmission control system plays an important role in ensuring the stable operation of the entire transmission structure and the safety of the converter valve. In the flexible DC transmission control system, the upper-level control module sends various command data to the sub-modules in real time. The sub-modules respond quickly, control the operation of relevant components, and upload their own status and lower-level fault data to the control module. The upper-level control module responds in a timely manner and makes different adjustments, sending new command data to the sub-modules.

[0003] As the lowest-level execution unit in the entire flexible DC transmission control system, the submodule needs to parse various data, issue control commands for bypass structures, valve unit drive structures, thyristor drive structures, etc., to relevant components, and perform real-time voltage detection and other fault detection, generating fault data and sending it to the upper-level control module. However, in the flexible DC transmission control system, the control module and submodules communicate via transmission lines. This structure carries certain risks. If the transmission line breaks or fails, the submodule will be unable to receive commands from the control module, becoming a "black module" (unresponsive) and its status will be unknown to the control module. This is a significant danger for the flexible DC transmission control system. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a flexible DC transmission control system that improves operational reliability while maintaining reasonable deployment costs.

[0005] According to a first aspect of the present invention, a flexible DC transmission control system includes: a first control module connected to at least one first submodule; and a second control module connected to at least one second submodule, wherein the first submodule and the second submodule are connected in a one-to-one correspondence; wherein the first control module is capable of sending first transmission data to the first submodule, the first transmission data including at least one of first command data and second command data, the first command data being used to control the operation of the first submodule, the second command data being used to control the operation of the second submodule, and the first submodule being capable of sending the first transmission data to the second submodule; the second control module is capable of sending second transmission data to the second submodule, the second transmission data including at least one of third command data and fourth command data, the third command data being used to control the operation of the first submodule, and the second command data being used to control the operation of the first submodule, the second command data including at least one of third command data and fourth command data, the third ... The four command data are used to control the operation of the second submodule. The second submodule can send second transmission data to the first submodule. The content of the first command data is the same as the content of the third command data, and the content of the second command data is the same as the content of the fourth command data. The first submodule can upload third transmission data to the first control module. The third transmission data includes at least one of first feedback data and second feedback data. The first feedback data is generated by the first submodule, and the second feedback data is generated by the second submodule. The second submodule can send the second feedback data to the first submodule. The second submodule can upload fourth transmission data to the second control module. The fourth transmission data includes at least one of first feedback data and second feedback data. The first submodule can send first feedback data to the second submodule.

[0006] A flexible DC transmission control system according to an embodiment of the present invention has at least the following beneficial effects:

[0007] This invention relates to a flexible DC transmission control system in which a first control module and a second control module are linked and synchronized. The first transmission data issued by the first control module includes first command data for controlling the operation of a first submodule and second command data for controlling the operation of a second submodule. Similarly, the second transmission data issued by the second control module includes third command data for controlling the operation of the first submodule and fourth command data for controlling the operation of the second submodule. Simultaneously, the first and second submodules are communicatively connected. First feedback data from the first submodule can be sent to the second submodule and, combined with the second feedback data, uploaded to the second control module. Likewise, second feedback data from the second submodule can be sent to the first submodule and, combined with the first feedback data, uploaded to the first control module. In this control module, if either the connection between the first submodule and the first control module, or the connection between the second submodule and the second control module, fails, the feedback data from the first and second submodules can still be uploaded to the first or second control module. The first or second control module then controls the first and second submodules. Since the content of the first command data is the same as the content of the third command data, either the first or third command data can control the first submodule. Similarly, since the content of the second and fourth command data is the same, either the second or fourth command data can also control the second submodule, resulting in consistent control effects. Therefore, this design can improve operational reliability and significantly enhance safety performance while maintaining reasonable layout costs.

[0008] According to some embodiments of the present invention, the first submodule includes a data processing unit, a first decoding unit, a first encoding unit, a second decoding unit, and a second encoding unit. The data processing unit is connected to the first decoding unit, the first encoding unit, the second decoding unit, and the second encoding unit, respectively. The first control module is connected to the first decoding unit to send first transmission data. The first encoding unit is connected to the first control module to upload third transmission data. The second encoding unit is connected to the first decoding unit to obtain the first transmission data. The second encoding unit is connected to the second submodule to send the first transmission data. The second decoding unit is connected to the second submodule to obtain second transmission data.

[0009] According to some embodiments of the present invention, the first control module and the first sub-module, the first sub-module and the second sub-module, and the second sub-module and the second control module are all connected by optical fiber components for communication.

[0010] According to some embodiments of the present invention, the optical fiber assembly includes two optical fibers.

[0011] According to some embodiments of the present invention, the first submodule generates a first uplink data packet and a second uplink data packet based on the first feedback data. The first uplink data packet is used to represent the identifier of the first feedback data, and the second uplink data packet is used to represent the content of the first feedback data. The first submodule generates a third uplink data packet and a fourth uplink data packet based on the second feedback data. The third uplink data packet is used to represent the identifier of the second feedback data, and the fourth uplink data packet is used to represent the content of the second feedback data. The first submodule uploads third transmission data to the first control module with a first set time as the first transmission cycle. In one of two adjacent first transmission cycles, the first uplink data packet and the second uplink data packet are sent sequentially. Correspondingly, in the other first transmission cycle, the third uplink data packet and the fourth uplink data packet are sent sequentially.

[0012] According to some embodiments of the present invention, the first control module generates a first downlink data packet and a second downlink data packet based on the first command data. The first downlink data packet is used to represent the identifier of the first command data, and the second downlink data packet is used to represent the content of the first command data. The first control module generates a third downlink data packet and a fourth downlink data packet based on the second command data. The third downlink data packet is used to represent the identifier of the second command data, and the fourth downlink data packet is used to represent the content of the second command data. The first control module sends first transmission data to the first submodule at a second transmission cycle with a second set time. In one of two adjacent second transmission cycles, the first downlink data packet and the second downlink data packet are sent sequentially. Correspondingly, in the other second transmission cycle, the third downlink data packet and the fourth downlink data packet are sent sequentially.

[0013] According to some embodiments of the present invention, the first submodule generates a first neighboring data packet and a second neighboring data packet based on the first feedback data. The first neighboring data packet is used to characterize the identifier of the first feedback data, and the second neighboring data packet is used to characterize the content of the first feedback data. The first submodule transmits the first feedback data to the second submodule at a third transmission period of a third set time. In the same third transmission period, the first neighboring data packet and the second neighboring data packet are sent sequentially, and the first transmission data is sent after the first neighboring data packet and the second neighboring data packet are sent.

[0014] According to some embodiments of the present invention, the first set time, the second set time, and the third set time are the same.

[0015] According to some embodiments of the present invention, when the first submodule receives first transmission data and second transmission data, the first submodule preferentially selects and responds to the first command data in the first transmission data; when the first submodule only receives the second transmission data, the first submodule responds to the third command data in the second transmission data.

[0016] According to some embodiments of the present invention, the first control module and the second control module are communicatively connected.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic block diagram of one embodiment of the flexible DC transmission control system of the present invention;

[0020] Figure 2 This is the principle structure block diagram of the first submodule;

[0021] Figure 3 This is a diagram illustrating the uploading of third-party data.

[0022] Figure 4 This is a schematic diagram of the first transmission of data;

[0023] Figure 5 This is a schematic diagram of the first feedback data transmission.

[0024] Figure label:

[0025] First control module 100; second control module 200; first submodule 300; data processing unit 310; first decoding unit 320; first encoding unit 330; second decoding unit 340; second encoding unit 350; second submodule 400. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0027] In the description of this invention, it should be understood that the orientation descriptions, such as the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer", indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0028] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] like Figure 1-5As shown, a flexible DC transmission control system according to a first aspect embodiment of the present invention includes a first control module 100 and a second control module 200. The first control module 100 is connected to at least one first submodule 300, and the second control module 200 is connected to at least one second submodule 400. The first submodule 300 and the second submodule 400 are connected in a one-to-one correspondence. The first control module 100 can send first transmission data to the first submodule 300. The first transmission data includes at least one of first command data and second command data. The first command data is used to control the operation of the first submodule 300, and the second command data is used to control the operation of the second submodule 400. The first submodule 300 can send the first transmission data to the second submodule 400, and the second control module 200 can send second transmission data to the second submodule 400. The second transmission data includes at least one of third command data and fourth command data. The first submodule 300 is controlled by a second command data, and the second submodule 400 is controlled by a third command data. The second submodule 400 can send second transmission data to the first submodule 300. The content of the first command data is the same as the content of the third command data, and the content of the second command data is the same as the content of the fourth command data. The first submodule 300 can upload third transmission data to the first control module 100. The third transmission data includes at least one of first feedback data and second feedback data. The first feedback data is generated by the first submodule 300, and the second feedback data is generated by the second submodule 400. The second submodule 400 can send the second feedback data to the first submodule 300. The second submodule 400 can upload fourth transmission data to the second control module 200. The fourth transmission data includes at least one of the first feedback data and second feedback data. The first submodule 300 can send the first feedback data to the second submodule 400.

[0031] It should be noted that the first control module 100 and the second control module 200 belong to the upper-level control end in the flexible DC transmission control system, while the first sub-module 300 and the second sub-module 400 serve as the lower-level execution units. Both the first sub-module 300 and the second sub-module 400 need to parse the data, issue various instructions for controlling the bypass structure, valve unit drive structure, thyristor drive structure, etc., to the relevant components, and also need to perform various fault detections such as voltage detection in real time, form fault data, and send it to the upper-level control module.

[0032] The content of the first command data is the same as the content of the third command data, and the content of the second command data is the same as the content of the fourth command data, meaning that the first control module 100 and the second control module 200 are in a synchronized state and have the same judgment logic. Therefore, the generation of the first command data and the third command data results in the same control over the first submodule 300. Similarly, the generation of the second command data and the fourth command data results in the same control over the second submodule 400. In some embodiments of the present invention, the first control module 100 and the second control module 200 are communicatively connected, thereby maintaining a synchronized state and improving system stability.

[0033] The first control module 100, the second control module 200, the first sub-module 300 and the second sub-module 400 can all be composed of processors such as FPGA, DSP and MCU and peripheral circuits.

[0034] In some embodiments of the present invention, the first control module 100 and the first sub-module 300, the first sub-module 300 and the second sub-module 400, and the second sub-module 400 and the second control module 200 are all connected by optical fiber components, which enables fast data transmission and efficient system operation.

[0035] In some embodiments of the present invention, the optical fiber assembly includes two optical fibers. For example, the first control module 100 uses one of its optical fibers to send data down, while the first sub-module 300 uses the other optical fiber to upload data. Between the first sub-module 300 and the second sub-module 400, one optical fiber can be used to transmit data, and the other optical fiber can be used to transmit data back.

[0036] In this invention's flexible DC transmission control system, a first control module 100 and a second control module 200 are linked and synchronized. The first transmission data issued by the first control module 100 includes first command data for controlling the operation of a first submodule 300 and second command data for controlling the operation of a second submodule 400. Similarly, the second transmission data issued by the second control module 200 includes third command data for controlling the operation of the first submodule 300 and fourth command data for controlling the operation of the second submodule 400. Simultaneously, the first submodule 300 and the second submodule 400 are communicatively connected. First feedback data from the first submodule 300 can be sent to the second submodule 400 and, combined with the second feedback data, uploaded to the second control module 200. Likewise, second feedback data from the second submodule 400 can be sent to the first submodule 300 and, combined with the first feedback data, uploaded to the first control module 200. In the control module 100, if either the connection between the first submodule 300 and the first control module 100, or the connection between the second submodule 400 and the second control module 200, fails, the feedback data from the first submodule 300 and the second submodule 400 can still be uploaded to the first control module 100 or the second control module 200. The first control module 100 or the second control module 200 can then control the first submodule 300 and the second submodule 400. Since the content of the first command data is the same as the content of the third command data, either the first command data or the third command data can control the first submodule 300. Similarly, since the content of the second command data and the fourth command data is the same, either the second command data or the fourth command data can also control the second submodule 400. The control effect is consistent. Therefore, this design can improve the reliability of operation and greatly enhance the safety performance while maintaining a reasonable layout cost.

[0037] In some embodiments of the present invention, such as Figure 2 As shown, the first submodule 300 includes a data processing unit 310, a first decoding unit 320, a first encoding unit 330, a second decoding unit 340, and a second encoding unit 350. The data processing unit 310 is connected to the first decoding unit 320, the first encoding unit 330, the second decoding unit 340, and the second encoding unit 350, respectively. The first control module 100 is connected to the first decoding unit 320 to send first transmission data. The first encoding unit 330 is connected to the first control module 100 to upload third transmission data. The second encoding unit 350 is connected to the first decoding unit 320 to obtain the first transmission data. The second encoding unit 350 is connected to the second submodule 400 to send the first transmission data. The second decoding unit 340 is connected to the second submodule 400 to obtain second transmission data.

[0038] The first decoding unit 320 parses the first transmitted data and obtains the first command data to provide to the data processing unit 310. The data processing unit 310 controls the lower-level components in the flexible DC transmission control system according to the first command data. While the first decoding unit 320 is parsing the first transmitted data, it also transmits the first transmitted data to the second encoding unit 350. The second encoding unit 350 then sends the first transmitted data to the second submodule 400. This process is simple, fast, convenient, and reliable. It should be noted that the second submodule 400 can also have the same principle structure as the first submodule 300. The second decoding unit 340 of the second submodule 400 can be connected to the second encoding unit 350 of the first submodule 300, and vice versa. The first feedback data generated by the first submodule 300 can be sent to the second submodule 400 through the second encoding unit 350. The second decoding unit 340 can also obtain the second feedback data from the second submodule 400, and at the same time, it can also obtain the second transmitted data.

[0039] In some embodiments of the present invention, such as Figure 4 As shown, the first submodule 300 generates a first uplink data packet and a second uplink data packet based on the first feedback data. The first uplink data packet is used to identify the first feedback data, and the second uplink data packet is used to identify the content of the first feedback data. The first submodule 300 generates a third uplink data packet and a fourth uplink data packet based on the second feedback data. The third uplink data packet is used to identify the second feedback data, and the fourth uplink data packet is used to identify the content of the second feedback data. The first submodule 300 uploads the third transmission data to the first control module 100 with a first set time as the first transmission cycle. In one of two adjacent first transmission cycles, the first uplink data packet and the second uplink data packet are sent sequentially. Correspondingly, in the other first transmission cycle, the third uplink data packet and the fourth uplink data packet are sent sequentially.

[0040] It should be noted that when the first submodule uploads data, it generally sends two data packets at a time, each data packet being a 32-bit data packet. To avoid misjudging the attribution of the first and second feedback data, this design sends only the first or only the second feedback data in each first transmission cycle. It also includes a first uplink data packet and a second uplink data packet to represent the first feedback data. The first uplink data packet identifies the first feedback data, and the second uplink data packet represents the content of the first feedback data. The first and second uplink data packets are sent together sequentially for easy identification. Similarly, this design includes a third and a fourth uplink data packet to represent the second feedback data. The third uplink data packet identifies the second feedback data, and the fourth uplink data packet represents the content of the second feedback data. The third and fourth uplink data packets are sent together sequentially for easy identification. Setting a fixed first transmission cycle prevents processing disorder caused by inconsistent transmission times during each third data transmission. Specifically, the second submodule also transmits data as described above, as shown in Table 1.

[0041] Table 1

[0042]

[0043] In some embodiments of the present invention, such as Figure 5 As shown, the first control module generates a first downlink data packet and a second downlink data packet based on the first command data. The first downlink data packet is used to identify the first command data, and the second downlink data packet is used to identify the content of the first command data. The first control module generates a third downlink data packet and a fourth downlink data packet based on the second command data. The third downlink data packet is used to identify the second command data, and the fourth downlink data packet is used to identify the content of the second command data. The first control module sends the first transmission data to the first submodule at a second transmission cycle with a second set time. Specifically, the first downlink data packet and the second downlink data packet are sent sequentially in one of two adjacent second transmission cycles, and correspondingly, the third downlink data packet and the fourth downlink data packet are sent sequentially in the other second transmission cycle.

[0044] Similarly, when the first control module sends data, it typically sends two data packets at a time, each consisting of 32 bits of data. To avoid misjudging the attribution of the first and second command data, this design sends only the first command data or only the second command data in each second transmission cycle. It also includes a first downlink data packet and a second downlink data packet to represent the first command data. The first downlink data packet identifies the first command data, and the second downlink data packet represents the content of the first command data. The first and second downlink data packets are sent sequentially for easy identification. Likewise, this design includes a third downlink data packet and a fourth downlink data packet to represent the second command data. The third downlink data packet identifies the second command data, and the fourth downlink data packet represents the content of the second command data. The third and fourth downlink data packets are sent sequentially for easy identification. Setting a fixed second transmission cycle prevents processing chaos caused by inconsistent transmission times during each first data transmission. Specifically, the second control module transmits data as described above, as shown in Table 2.

[0045] Table 2

[0046]

[0047]

[0048] In some embodiments of the present invention, such as Figure 5 As shown, the first submodule generates a first neighboring data packet and a second neighboring data packet based on the first feedback data. The first neighboring data packet is used to represent the identifier of the first feedback data, and the second neighboring data packet is used to represent the content of the first feedback data. The first submodule transmits the first feedback data to the second submodule at a third set time as the third transmission cycle. In the same third transmission cycle, the first neighboring data packet and the second neighboring data packet are sent sequentially. After sending the first neighboring data packet and the second neighboring data packet, the first transmission data is sent.

[0049] When the first submodule sends data to the second submodule, the first feedback data needs to be distinguished from the first transmitted data. Therefore, in order to avoid misjudging the type of the first feedback data and the second transmitted data, a first neighboring data packet and a second neighboring data packet are generated based on the first feedback data. The first neighboring data packet is used to identify the first feedback data, and the second neighboring data packet is used to identify the content of the first feedback data. The first neighboring data packet and the second neighboring data packet are sent together in sequence for easy identification. Since the transmission time of the first neighboring data packet and the second neighboring data packet is relatively short, the spare time after sending the first neighboring data packet and the second neighboring data packet in the same third transmission cycle can also be used to send the first transmitted data, so that the system can operate quickly and efficiently. Specifically, the second submodule also transmits data as above, as shown in Table 3.

[0050] Table 3

[0051]

[0052] In some embodiments of the present invention, the first set time, the second set time, and the third set time are the same, thereby ensuring that the data transmission cycle between the first submodule, the second submodule, the first control module, and the second control module remains consistent, the data transmission proceeds in an orderly manner, and the occurrence of system disorder is reduced.

[0053] In some embodiments of the present invention, when the first submodule receives first transmitted data and second transmitted data, the first submodule preferentially selects and responds to the first command data in the first transmitted data; when the first submodule only receives the second transmitted data, the first submodule responds to the third command data in the second transmitted data. Here, the data processing priority of the first submodule is set. When the transmission lines between the first submodule and the first control module, and between the second submodule and the second control module, are not damaged, the first submodule and the second submodule preferentially process the instructions from the upper and lower layers, thereby making the system run stably and reducing the occurrence of system malfunctions.

[0054] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A flexible DC transmission control system, characterized in that, include: The first control module is connected to at least one first sub-module; The second control module is connected to at least one second sub-module, and the first sub-module and the second sub-module are connected in a one-to-one correspondence; The first control module can send first transmission data to the first sub-module. The first transmission data includes at least one of first command data and second command data. The first command data is used to control the operation of the first sub-module, and the second command data is used to control the operation of the second sub-module. The first sub-module can send the first transmission data to the second sub-module. The second control module can send second transmission data to the second submodule. The second transmission data includes at least one of third command data and fourth command data. The third command data is used to control the operation of the first submodule, and the fourth command data is used to control the operation of the second submodule. The second submodule can send the second transmission data to the first submodule. The content of the first command data is the same as the content of the third command data, and the content of the second command data is the same as the content of the fourth command data. The first submodule is capable of uploading third transmission data to the first control module. The third transmission data includes at least one of first feedback data and second feedback data. The first feedback data is generated by the first submodule, and the second feedback data is generated by the second submodule. The second submodule is capable of sending the second feedback data to the first submodule. The second submodule can upload fourth transmission data to the second control module. The fourth transmission data includes at least one of first feedback data and second feedback data. The first submodule can send the first feedback data to the second submodule. The first submodule generates a first uplink data packet and a second uplink data packet based on the first feedback data. The first uplink data packet is used to identify the first feedback data, and the second uplink data packet is used to identify the content of the first feedback data. The first submodule generates a third uplink data packet and a fourth uplink data packet based on the second feedback data. The third uplink data packet is used to identify the second feedback data, and the fourth uplink data packet is used to identify the content of the second feedback data. The first submodule uploads third transmission data to the first control module with a first set time as the first transmission cycle. In one of two adjacent first transmission cycles, the first uplink data packet and the second uplink data packet are sent sequentially. Correspondingly, in the other first transmission cycle, the third uplink data packet and the fourth uplink data packet are sent sequentially.

2. The flexible DC transmission control system according to claim 1, characterized in that: The first submodule includes a data processing unit, a first decoding unit, a first encoding unit, a second decoding unit, and a second encoding unit. The data processing unit is connected to the first decoding unit, the first encoding unit, the second decoding unit, and the second encoding unit, respectively. The first control module is connected to the first decoding unit to send first transmission data. The first encoding unit is connected to the first control module to upload third transmission data. The second encoding unit is connected to the first decoding unit to obtain the first transmission data. The second encoding unit is connected to the second submodule to send the first transmission data. The second decoding unit is connected to the second submodule to obtain second transmission data.

3. The flexible DC transmission control system according to claim 1, characterized in that: The first control module and the first sub-module, the first sub-module and the second sub-module, and the second sub-module and the second control module are all connected via optical fiber components.

4. A flexible DC transmission control system according to claim 3, characterized in that: The optical fiber assembly includes two optical fibers.

5. A flexible DC transmission control system according to claim 1, characterized in that: The first control module generates a first downlink data packet and a second downlink data packet based on the first command data. The first downlink data packet is used to identify the first command data, and the second downlink data packet is used to identify the content of the first command data. The first control module generates a third downlink data packet and a fourth downlink data packet based on the second command data. The third downlink data packet is used to identify the second command data, and the fourth downlink data packet is used to identify the content of the second command data. The first control module sends first transmission data to the first submodule at a second transmission cycle with a second set time. Specifically, the first downlink data packet and the second downlink data packet are sent sequentially in one of two adjacent second transmission cycles, and correspondingly, the third downlink data packet and the fourth downlink data packet are sent sequentially in the other second transmission cycle.

6. A flexible DC transmission control system according to claim 5, characterized in that: The first submodule generates a first neighboring data packet and a second neighboring data packet based on the first feedback data. The first neighboring data packet is used to represent the identifier of the first feedback data, and the second neighboring data packet is used to represent the content of the first feedback data. The first submodule transmits the first feedback data to the second submodule at a third set time as the third transmission cycle. In the same third transmission cycle, the first neighboring data packet and the second neighboring data packet are sent sequentially. After the first neighboring data packet and the second neighboring data packet are sent, the first transmission data is sent.

7. A flexible DC transmission control system according to claim 6, characterized in that: The first set time, the second set time, and the third set time are the same.

8. A flexible DC transmission control system according to claim 1, characterized in that: When the first submodule receives the first transmitted data and the second transmitted data, the first submodule prioritizes and responds to the first command data in the first transmitted data; When the first submodule receives only the second transmitted data, the first submodule responds with the third command data in the second transmitted data.

9. A flexible DC transmission control system according to claim 1, characterized in that: The first control module is communicatively connected to the second control module.

Images