Communication system and method of flexible direct current transmission converter valve submodule

Abstract

The invention belongs to the technical field of high-voltage flexible direct-current power transmission, and particularly relates to a communication system and method of a flexible direct-current power transmission converter valve submodule, the communication system comprises two submodule interface devices arranged between a valve controller and the submodule, each submodule interface device comprises M submodule interface boards, each sub-module interface board is provided with n sub-module interfaces which are used for accessing n corresponding sub-modules, M is a positive integer, part or all of the accessed sub-modules in any interface board are in communication connection with the accessed sub-modules of other interface boards, and the number of the sub-modules is 2Mn. According to the invention, the situation that when the sub-module interface board fails, all the sub-modules connected with the sub-module interface board cannot be connected to the valve control system and are bypassed in batches can be avoided, for example, when one sub-module interface board fails, the sub-module on the sub-module interface board can normally communicate with the sub-module interface device by communicating with other sub-modules.

Description

Technical Field

[0001] The present invention relates to a communication system and method for a flexible direct current transmission converter valve submodule, belonging to the technical field of high-voltage flexible direct current transmission. Background Art

[0002] The flexible DC transmission converter valve system plays an important role in the AC-DC conversion process. It generally adopts multi-level sub-modular technology. When the voltage level of the DC transmission system is very high, many sub-modules need to be connected in series to form a single bridge arm of the converter valve. Each bridge arm contains a certain number of spare sub-modules. When a sub-module fails, it can be replaced by a spare sub-module to maintain the normal operation of the flexible DC transmission converter valve system. However, when the number of faulty sub-modules exceeds the number of spare sub-modules, the system will trip.

[0003] The prior art directly communicates and connects the valve control system with the submodule of each converter valve, so the submodule interface in the valve control system is not redundant. When a submodule interface board fails, all submodules connected to the module interface board will not be able to access the valve control system normally. In some extreme cases, the system may even be shut down, seriously affecting the stability and safety of the flexible DC transmission project.

[0004] In order to avoid the failure of too many submodules when the submodule interface board fails, resulting in insufficient spare submodules, the existing solution limits the number of submodules connected to each submodule interface board, and generally sets the number to be less than half of the number of spare submodules in the bridge arm, to avoid the failure of more than two submodule interface boards at the same time, which will lead to the exhaustion of spare submodules in the bridge arm. However, when a submodule interface board fails, all submodules connected to the module interface board will still be unable to access the valve control system and will be bypassed in batches, resulting in the need to call spare submodules in batches even if these submodules are intact, and once the number of submodule interface boards that fail is slightly larger, the number of spare submodules will be difficult to ensure the normal operation of the system. Summary of the invention

[0005] The purpose of the present invention is to provide a communication system and method for a flexible DC transmission converter valve submodule to solve the problem in the prior art that when a submodule interface board fails, all submodules connected to the module interface board will still be unable to access the valve control system and be bypassed in batches.

[0006] To achieve the above-mentioned purpose, the first aspect of the technical solution of the present invention is a communication system for a flexible DC transmission converter valve submodule, characterized in that it includes two submodule interface devices arranged between the valve control and the submodule, each submodule interface device includes M submodule interface boards, each submodule interface board has n submodule interfaces for accessing the corresponding n submodules, wherein M is a positive integer, wherein some or all of the submodules accessed in any one interface board are communicatively connected with the submodules accessed by other interface boards, and the number of submodules is 2Mn.

[0007] The present invention can avoid the situation where, when a submodule interface board fails, all submodules connected to the module interface board cannot be connected to the valve control system and are bypassed in batches. For example, when one submodule interface board fails, the submodules on the submodule interface board can communicate normally with the submodule interface device by communicating with other submodules.

[0008] Furthermore, all submodules connected to any one interface board are communicatively connected with submodules in other interface boards, so as to ensure that when one interface board fails, each submodule on it can communicate with the valve control device through other submodules.

[0009] Furthermore, the submodules are numbered sequentially, and the submodules numbered as odd numbers 2i-1 communicate with the submodules numbered as even numbers 2i, where i is a positive integer, i=1, 2, ..., Mn.

[0010] Furthermore, the submodules numbered 2N-1 in one of the submodule interface devices are arranged as follows:

[0011] The submodules connected to the No. 1 submodule interface board are, from top to bottom: 1, 3, ..., 2n-3, 2n-1;

[0012] The submodules connected to the No. 2 submodule interface board are, from top to bottom: 2n+1, 2n+3, ..., 4n-3, 4n-1;

[0013] …

[0014] The submodules connected to the M-1 submodule interface board are, from top to bottom, 2(M-2)n+1, 2(M-2)n+3, ..., 2(M-1)n-3, 2(M-1)n-1;

[0015] The submodules connected to the M submodule interface board are, from top to bottom, 2(M-1)n+1, 2(M-1)n+3, ..., 2Mn-3, 2Mn-1;

[0016] The submodules numbered 2N in another submodule interface device are arranged as follows:

[0017] The submodules connected to the No. 1 submodule interface board are as follows from top to bottom: 2, 2M+2, ..., 2M(n-2)+2, 2M(n-1)+2;

[0018] The number of submodules connected to the No. 2 submodule interface board is as follows from top to bottom: 4, 2M+4, ..., 2M(n-2)+4, 2M(n-1)+4;

[0019] …

[0020] The submodules connected to the M-1 submodule interface board are as follows from top to bottom: 2M-2, 4M-2, ..., 2M(n-1)-2, 2Mn-2;

[0021] The M-submodule interface board access submodules are as follows from top to bottom: 2M, 4M, ..., 2M(n-1), 2Mn;

[0022] When the submodule communicates normally with the connected submodule interface board, the submodule is connected to the valve control device via the submodule interface board in the connected submodule interface device;

[0023] When the communication between the submodule and the connected submodule interface board is abnormal, the submodule is connected to the valve control device through the submodules on other submodule interface boards connected to it.

[0024] This connection method can use the least connection lines to achieve that when a submodule interface board fails, any submodule on it can communicate with the valve control device through the submodules on other submodule interface boards connected to the submodule;

[0025] When two submodule interface boards fail, the two submodules connected on the two submodule interface boards cannot communicate with the valve control device, and any other submodule on the two submodule interface boards communicates with the air-generating device through the submodule on the other submodule interface board connected to it.

[0026] A second aspect of the technical solution of the present invention provides a communication method for a flexible DC transmission converter valve submodule, comprising:

[0027] S1: Establishing communication, establishing communication between any submodule in some or all of the submodules in each submodule interface board and a submodule in any other interface board;

[0028] S2: Communication selection:

[0029] When the submodule communicates normally with the connected submodule interface board, the submodule periodically receives the control instructions sent by the valve control device through the submodule interface board in the submodule interface device, and at the same time, periodically uploads the status information of the submodule to the valve control device through the connected submodule interface board and the submodule interface device connected by the submodule interface board;

[0030] When the communication between the submodule and the connected submodule interface board is abnormal, the submodule receives the control instructions issued by the valve control device through the submodule interface device connected to the other interface boards through the submodules on the other interface boards connected to it, and at the same time uploads the status information of the submodule to the valve control device through the submodule interface boards connected to the other connected submodules and the submodule interface device connected to the submodule interface board.

[0031] Furthermore, the submodules are numbered sequentially, and the submodules numbered as odd numbers 2i-1 communicate with the submodules numbered as even numbers 2i, where i is a positive integer, i=1, 2, ..., Mn.

[0032] Furthermore, the submodules numbered 2N-1 in one of the submodule interface devices are arranged as follows:

[0033] The submodules connected to the No. 1 submodule interface board are, from top to bottom: 1, 3, ..., 2n-3, 2n-1;

[0034] The submodules connected to the No. 2 submodule interface board are, from top to bottom: 2n+1, 2n+3, ..., 4n-3, 4n-1;

[0035] …

[0036] The submodules connected to the M-1 submodule interface board are, from top to bottom, 2(M-2)n+1, 2(M-2)n+3, ..., 2(M-1)n-3, 2(M-1)n-1;

[0037] The submodules connected to the M submodule interface board are, from top to bottom, 2(M-1)n+1, 2(M-1)n+3, ..., 2Mn-3, 2Mn-1;

[0038] The submodules numbered 2N in another submodule interface device are arranged as follows:

[0039] The submodules connected to the No. 1 submodule interface board are as follows from top to bottom: 2, 2M+2, ..., 2M(n-2)+2, 2M(n-1)+2;

[0040] The number of submodules connected to the No. 2 submodule interface board is as follows from top to bottom: 4, 2M+4, ..., 2M(n-2)+4, 2M(n-1)+4;

[0041] …

[0042] The submodules connected to the M-1 submodule interface board are as follows from top to bottom: 2M-2, 4M-2, ..., 2M(n-1)-2, 2Mn-2;

[0043] The M submodule interface board is connected to the submodules in the order from top to bottom: 2M, 4M, ..., 2M(n-1), 2Mn.

[0044] Furthermore, it also includes:

[0045] When a submodule interface board fails, any submodule on it communicates with the valve control device through the submodules on other submodule interface boards connected to the submodule;

[0046] When two submodule interface boards fail, the two submodules connected on the two submodule interface boards cannot communicate with the valve control device, and any other submodule on the two submodule interface boards communicates with the air-generating device through the submodule on the other submodule interface board connected to it. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a logic diagram of the communication method of the present invention.

[0048] Figure 2 It is a schematic diagram of the subunit communication architecture of the present invention;

[0049] Figure 3 It is a communication system diagram of the flexible DC transmission converter valve submodule of the present invention;

[0050] Figure 4 It is a schematic diagram of two submodule interface boards simultaneously failing in the communication system of the flexible DC transmission converter valve submodule of the present invention;

[0051] Figure 1 , 2 The circles in , 3, and 4 represent submodules, the numbers in the circles represent the submodule numbers, the double-arrow segments represent bidirectional optical fiber communication pairs, the boxes represent submodule interfaces, and the numbers in the boxes represent the numbers of the connected submodules. DETAILED DESCRIPTION

[0052] In order to more clearly illustrate the technical route, implementation strategy and solution advantages of the invention, the invention will be analyzed and explained in depth below in combination with the accompanying drawings, but the implementation method of the invention is not limited to this.

[0053] Example 1

[0054] like Figure 2-3As shown, the communication system of the flexible DC transmission converter valve submodule includes a converter valve submodule interface unit, the submodule interface unit includes two submodule interface devices, each submodule interface device contains M submodule interface boards, each submodule interface board has n submodule interfaces for accessing n submodules, each submodule includes at least two optical signal receiving ports and two optical signal sending ports, and all submodules communicate with the submodule interface device through a two-way communication optical fiber using an asymmetric access method.

[0055] In order to clearly illustrate the asymmetric connection mode in this embodiment, all submodules are numbered as 1, 2, 3, 4 ... 2Mn-3, 2Mn-2, 2Mn-1, 2Mn, and the submodule numbered as an odd number 2N-1 and the submodule numbered as an even number 2N (N is a positive integer) transmit information to each other through optical fibers;

[0056] All the odd-numbered submodules 1, 3, ..., 2Mn-3, 2Mn-1 are connected to the submodule interface device 1 through a bidirectional communication optical fiber. The submodules in the submodule interface device 1 are arranged from top to bottom and then from left to right, as follows:

[0057] The submodules connected to the No. 1 submodule interface board are, from top to bottom: 1, 3, ..., 2n-3, 2n-1;

[0058] The submodules connected to the No. 2 submodule interface board are, from top to bottom: 2n+1, 2n+3, ..., 4n-3, 4n-1;

[0059] …

[0060] The submodules connected to the M-1 submodule interface board are, from top to bottom, 2(M-2)n+1, 2(M-2)n+3, ..., 2(M-1)n-3, 2(M-1)n-1;

[0061] The submodules connected to the M submodule interface board are, from top to bottom, 2(M-1)n+1, 2(M-1)n+3, ..., 2Mn-3, 2Mn-1;

[0062] All submodules 2, 4, ..., 2Mn-2, 2Mn with even numbers are connected to the submodule interface device 2 through bidirectional communication optical fibers. The submodules in the submodule interface device 2 are arranged in sequence from left to right and then from top to bottom, as follows:

[0063] The submodules connected to the No. 1 submodule interface board are as follows from top to bottom: 2, 2M+2, ..., 2M(n-2)+2, 2M(n-1)+2;

[0064] The number of submodules connected to the No. 2 submodule interface board is as follows from top to bottom: 4, 2M+4, ..., 2M(n-2)+4, 2M(n-1)+4;

[0065] …

[0066] The M-1 submodule interface board access submodules are as follows from top to bottom: 2M-2, 4M-2, ..., 2M(n-1)-2, 2Mn-2; the M submodule interface board access submodules are as follows from top to bottom: 2M, 4M, ..., 2M(n-1), 2Mn;

[0067] When the number of single-bridge-arm sub-modules increases during actual application, the number of sub-module interface devices may be increased accordingly.

[0068] Example 2

[0069] like Figure 1 The present invention also proposes a communication method for a flexible DC transmission converter valve submodule, comprising:

[0070] When the system is powered on, the communication method of the submodule numbered 2N-1 is as follows: when the submodule numbered 2N-1 communicates normally with the submodule interface device 1, it periodically receives the control instructions sent by the submodule interface device 1, and uploads the status information of the submodule to the submodule interface device 1;

[0071] When the submodule interface board connected to the submodule numbered 2N-1 has abnormal communication with the valve control device, the submodule can receive the control instructions issued by the valve control system through the submodule numbered 2N that communicates with it, and upload the status information of the submodule at the same time. The communication method of any other submodule is the same as that of the submodule numbered 2N;

[0072] like Figure 4 As shown, when the No. 1 submodule interface board in the submodule interface device 1 and the No. 1 submodule interface board in the submodule interface device 2 fail at the same time, the communication between the submodule numbered 1 and the submodule interface device 1 is disconnected and thus cannot communicate with the valve control system, and the communication between the submodule numbered 2 and the submodule interface device 2 is also disconnected and cannot communicate with the valve control system, which causes the failure of the submodule numbered 1 and the submodule numbered 2, while the other submodules can still communicate normally and will not be bypassed in batches (taking the submodule numbered 3 as an example, the submodule can communicate normally with the No. 2 submodule interface board in the submodule interface device 2 through the submodule numbered 4, and the principle for other submodules to maintain normal communication is the same as the principle for the submodule numbered 3 to maintain normal communication.

[0073] The numbering of sub-modules in the present invention is intended to facilitate the description of the connection relationship between the sub-modules on each interface board in the technical solution of the present invention, rather than to limit the technical solution of the present invention. Technical solutions that are different from the numbering method of the present invention but have the same or similar actual connection logic also fall within the scope of protection of the present invention.

[0074] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0075] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0076] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0077] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

Claims

1. A communication system for a flexible DC transmission converter valve submodule, characterized in that: It includes two submodule interface devices arranged between the valve control and the submodules, each submodule interface device includes M submodule interface boards, each submodule interface board has n submodule interfaces for accessing the corresponding n submodules, wherein M is a positive integer, wherein part or all of the submodules accessed in any one interface board are communicatively connected with the submodules accessed in other interface boards, and the number of submodules is 2Mn.

2. The communication system of the flexible DC transmission converter valve submodule according to claim 1, characterized in that: All submodules connected to any one interface board are communicatively connected to submodules in other interface boards.

3. The communication system of the flexible DC transmission converter valve submodule according to claim 2, characterized in that: The submodules are numbered sequentially, and the submodules numbered as odd numbers 2i-1 communicate with the submodules numbered as even numbers 2i, where i is a positive integer, i=1, 2, ..., Mn.

4. The communication system of the flexible DC transmission converter valve submodule according to claim 3, characterized in that: The submodules numbered 2N-1 in one of the submodule interface devices are arranged as follows: The submodules connected to the No. 1 submodule interface board are, from top to bottom: 1, 3, ..., 2n-3, 2n-1; The submodules connected to the No. 2 submodule interface board are, from top to bottom: 2n+1, 2n+3, ..., 4n-3, 4n-1; …… The submodules connected to the M-1 submodule interface board are, from top to bottom, 2(M-2)n+1, 2(M-2)n+3, ..., 2(M-1)n-3, 2(M-1)n-1; The submodules connected to the M submodule interface board are, from top to bottom, 2(M-1)n+1, 2(M-1)n+3, ..., 2Mn-3, 2Mn-1; The submodules numbered 2N in another submodule interface device are arranged as follows: The submodules connected to the No. 1 submodule interface board are as follows from top to bottom: 2, 2M+2, ..., 2M(n-2)+2, 2M(n-1)+2; The number of submodules connected to the No. 2 submodule interface board is as follows from top to bottom: 4, 2M+4, ..., 2M(n-2)+4, 2M(n-1)+4; …… The submodules connected to the M-1 submodule interface board are as follows from top to bottom: 2M-2, 4M-2, ..., 2M(n-1)-2, 2Mn-2; The M-submodule interface board access submodules are as follows from top to bottom: 2M, 4M, ..., 2M(n-1), 2Mn; When the submodule communicates normally with the connected submodule interface board, the submodule is connected to the valve control device via the submodule interface board in the connected submodule interface device; When the communication between the submodule and the connected submodule interface board is abnormal, the submodule is connected to the valve control device through the submodules on other submodule interface boards connected to it.

5. A communication method for a flexible DC transmission converter valve submodule, characterized in that: include: S1: Establishing communication, establishing communication between any submodule in some or all of the submodules in each submodule interface board and a submodule in any other interface board; S2: Communication selection: When the submodule communicates normally with the connected submodule interface board, the submodule periodically receives the control instructions sent by the valve control device through the submodule interface board in the submodule interface device, and at the same time, periodically uploads the status information of the submodule to the valve control device through the connected submodule interface board and the submodule interface device connected by the submodule interface board; When the communication between the submodule and the connected submodule interface board is abnormal, the submodule receives the control instructions issued by the valve control device through the submodule interface device connected to the other interface boards through the submodules on the other interface boards connected to it, and at the same time uploads the status information of the submodule to the valve control device through the submodule interface boards connected to the other connected submodules and the submodule interface device connected to the submodule interface board.

6. The communication method of the flexible DC transmission converter valve submodule according to claim 5, characterized in that: The submodules are numbered sequentially, and the submodules numbered as odd numbers 2i-1 communicate with the submodules numbered as even numbers 2i, where i is a positive integer, i=1, 2, ..., Mn.

7. The communication method of the flexible DC transmission converter valve submodule according to claim 6, characterized in that: The submodules numbered 2N-1 in one of the submodule interface devices are arranged as follows: The submodules connected to the No. 1 submodule interface board are, from top to bottom: 1, 3, ..., 2n-3, 2n-1; The submodules connected to the No. 2 submodule interface board are, from top to bottom: 2n+1, 2n+3, ..., 4n-3, 4n-1; …… The submodules connected to the M-1 submodule interface board are, from top to bottom, 2(M-2)n+1, 2(M-2)n+3, ..., 2(M-1)n-3, 2(M-1)n-1; The submodules connected to the M submodule interface board are, from top to bottom, 2(M-1)n+1, 2(M-1)n+3, ..., 2Mn-3, 2Mn-1; The submodules numbered 2N in another submodule interface device are arranged as follows: The submodules connected to the No. 1 submodule interface board are as follows from top to bottom: 2, 2M+2, ..., 2M(n-2)+2, 2M(n-1)+2; The number of submodules connected to the No. 2 submodule interface board is as follows from top to bottom: 4, 2M+4, ..., 2M(n-2)+4, 2M(n-1)+4; …… The submodules connected to the M-1 submodule interface board are as follows from top to bottom: 2M-2, 4M-2, ..., 2M(n-1)-2, 2Mn-2; The M submodule interface board is connected to the submodules in the order from top to bottom: 2M, 4M, ..., 2M(n-1), 2Mn.

8. The communication method of the flexible DC transmission converter valve submodule according to claim 7, characterized in that: Also includes: When a submodule interface board fails, any submodule on it communicates with the valve control device through the submodules on other submodule interface boards connected to the submodule; When two submodule interface boards fail, the two submodules connected on the two submodule interface boards cannot communicate with the valve control device, and any other submodule on the two submodule interface boards communicates with the air-generating device through the submodule on the other submodule interface board connected to it.

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