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

Abstract

The invention relates to the technical field of flexible direct-current power transmission, and particularly provides a communication system and method of a flexible direct-current converter valve submodule and a valve control system. Comprising a first pole control and protection unit, a second pole control and protection unit, a first converter valve control and protection unit, a second converter valve control and protection unit, a first valve base interface unit, a second valve base interface unit, a first optical splitter, a second optical splitter and a flexible direct current converter valve sub-module. According to the technical scheme provided by the invention, the communication redundancy degree can be improved while the number of communication long optical fibers between the flexible direct current converter valve sub-module and the valve control system is greatly reduced.

Description

Technical Field

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

[0002] Flexible DC transmission is a new type of power transmission method after AC transmission and conventional DC transmission. It has significant technical advantages in the fields of large-scale renewable energy grid connection and flexible interconnection of regional power grids. The DC voltage has also been raised to the ultra-high voltage level (±800kV and above). However, at this voltage level, the number of sub-modules in series in a single bridge arm of the flexible DC converter valve exceeds one thousand. The traditional "point-to-point" communication method between the converter valve sub-module and the valve control brings a huge number of optical fibers and a large scale of valve control, which in turn greatly increases the construction and operation and maintenance costs of the converter station. It is urgent to study the communication architecture that reduces the communication optical fiber between the converter valve sub-module and the valve control.

[0003] The invention patent "Flexible DC converter valve networking system and control method based on optical distributor" with announcement number CN 202310901435.2 proposes a flexible DC converter valve networking system, but has the following technical defects: (1) Since the feedback information of all converter valve sub-modules in the converter unit group is collected through the passive optical distributor and returned to the valve control system, if a hardware failure of a sub-module control board causes the optical transmitter to continue to "always have light", the status information of other sub-modules will not be returned normally, which may cause the system to shut down; (2) The valve control system is not configured in a dual configuration and does not meet the flexible DC transmission operation and maintenance requirements; (3) The derating of the light intensity of the downlink communication link of the valve control system is not considered. Summary of the invention

[0004] In order to overcome the above defects, the present invention proposes a communication system and method between a flexible DC converter valve submodule and a valve control system.

[0005] In a first aspect, a communication system between a flexible DC converter valve submodule and a valve control system is provided, wherein the communication system between the flexible DC converter valve submodule and the valve control system comprises:

[0006] A first pole control protection unit, a second pole control protection unit, a first converter valve control protection unit, a second converter valve control protection unit, a first valve base interface unit, a second valve base interface unit, a first optical splitter, a second optical splitter, and a flexible DC converter valve submodule;

[0007] The first pole control protection unit is communicatively connected with the second pole control protection unit;

[0008] The first pole control protection unit is communicatively connected with the first converter valve control protection unit;

[0009] The second pole control protection unit is communicatively connected with the second converter valve control protection unit;

[0010] The first converter valve control and protection unit, the second converter valve control and protection unit, the first valve base interface unit and the second valve base interface unit are cross-redundantly communicated with each other;

[0011] Two trigger communication links are provided between the first valve base interface unit and the first optical splitter;

[0012] Two trigger communication links are provided between the second valve base interface unit and the second optical splitter;

[0013] The first optical splitter is connected to the odd-coded flexible DC converter valve submodules through control instruction communication optical fibers respectively;

[0014] The second optical splitter is connected to the flexible DC converter valve submodules with even number coding through control instruction communication optical fibers respectively;

[0015] An interactive communication link is provided between two adjacent numbered flexible DC converter valve submodules;

[0016] The flexible DC converter valve submodules are internally networked through an uplink status information communication optical fiber. The flexible DC converter valve submodules corresponding to numbers 1 and n-1 are connected to the first valve base interface unit through the uplink status information communication optical fiber. The flexible DC converter valve submodules corresponding to numbers 2 and n are connected to the second valve base interface unit through the uplink status information communication optical fiber. n is the maximum value of the flexible DC converter valve submodule number and n is an even number.

[0017] Preferably, the pole control protection unit, the converter valve control protection unit, and the valve base interface unit are arranged at ground potential, and each flexible DC converter valve submodule and the optical splitter are arranged on a high-potential valve tower.

[0018] Preferably, the converter valve control and protection unit is used to calculate the switching instructions of each flexible DC converter valve sub-module by using a sub-module voltage balancing algorithm according to the bridge arm voltage reference wave and status information of each flexible DC converter valve sub-module issued by the pole control unit, and issue them to the valve base interface unit through cross-redundant communication.

[0019] Preferably, the communication timing and communication content of the two triggered communication links are the same.

[0020] Preferably, the two trigger communication links are both provided with a trigger backcheck monitoring unit for detecting a trigger communication link failure.

[0021] Preferably, when it is detected that the trigger communication link sends constant light, it is determined that the trigger communication link is faulty.

[0022] Preferably, the interactive communication link is used to transparently transmit the sub-module control instruction of the optical splitter received by the flexible DC converter valve sub-module at one end of the communication link to the flexible DC converter valve sub-module at the other end of the communication link.

[0023] Preferably, the flexible DC converter valve submodules corresponding to numbers 1 and n-1 are connected to the uplink reporting status information communication optical fiber in the first valve base interface unit through the uplink reporting status information communication optical fiber for uploading the submodule status information summarized by the flexible DC converter valve submodules corresponding to numbers 1 and n-1 to the first valve base interface unit; the flexible DC converter valve submodules corresponding to numbers 2 and n are connected to the uplink reporting status information communication optical fiber in the first valve base interface unit through the uplink reporting status information communication optical fiber for uploading the submodule status information summarized by the flexible DC converter valve submodules corresponding to numbers 2 and n to the second valve base interface unit.

[0024] Furthermore, the submodule status information includes at least one of the following: submodule voltage, component fault information, and IGBT switching status.

[0025] In a second aspect, a method for a communication system based on a flexible DC converter valve submodule and a valve control system is provided, wherein the method for a communication system based on a flexible DC converter valve submodule and a valve control system comprises:

[0026] When the first pole control protection unit, the first optical splitter, or the two trigger communication links provided between the first valve base interface unit and the first optical splitter fail, the flexible DC converter valve submodule corresponding to the odd number obtains its own switching instruction through the flexible DC converter valve submodule corresponding to the even number connected thereto;

[0027] When the second pole control protection unit, the second splitter, or the two trigger communication links between the second valve base interface unit and the second splitter fail, the flexible DC converter valve submodule corresponding to the even number obtains its own switching instruction through the flexible DC converter valve submodule corresponding to the odd number connected to it.

[0028] In a third aspect, a computer device is provided, comprising: one or more processors;

[0029] The processor is configured to execute one or more programs;

[0030] When the one or more programs are executed by the one or more processors, the method of the communication system between the flexible DC converter valve submodule and the valve control system is implemented.

[0031] In a fourth aspect, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed, the method of the communication system between the flexible DC converter valve submodule and the valve control system is implemented.

[0032] The above one or more technical solutions of the present invention have at least one or more of the following beneficial effects:

[0033] The present invention provides a communication system and method between a flexible DC converter valve submodule and a valve control system, including: a first pole control protection unit, a second pole control protection unit, a first converter valve control protection unit, a second converter valve control protection unit, a first valve base interface unit, a second valve base interface unit, a first optical splitter, a second optical splitter, and a flexible DC converter valve submodule; the first pole control protection unit is communicatively connected to the second pole control protection unit; the first pole control protection unit is communicatively connected to the first converter valve control protection unit; the second pole control protection unit is communicatively connected to the second converter valve control protection unit; the first converter valve control protection unit, the second converter valve control protection unit, the first valve base interface unit, and the second valve base interface unit are cross-redundantly communicated with each other; two trigger communication links are provided between the first valve base interface unit and the first optical splitter; There are two trigger communication links between the second valve base interface unit and the second optical splitter; the first optical splitter is connected to the odd-coded flexible DC converter valve submodules through the control instruction communication optical fiber; the second optical splitter is connected to the even-coded flexible DC converter valve submodules through the control instruction communication optical fiber; an interactive communication link is provided between two adjacent numbered flexible DC converter valve submodules; each flexible DC converter valve submodule is internally networked through the uplink status information communication optical fiber, the flexible DC converter valve submodules corresponding to the numbers 1 and n-1 are connected to the first valve base interface unit through the uplink status information communication optical fiber, and the flexible DC converter valve submodules corresponding to the numbers 2 and n are connected to the second valve base interface unit through the uplink status information communication optical fiber, n is the maximum number of the flexible DC converter valve submodule and n is an even number. The technical solution provided by the present invention can improve the communication redundancy while greatly reducing the number of long optical fibers for communication between the flexible DC converter valve submodule and the valve control system, specifically:

[0034] In the technical solution provided by the present invention, the number of long-distance optical fibers used from the valve control to the converter valve tower is reduced to 4 pairs, which is a significant reduction compared to the number of point-to-point communication optical fibers.

[0035] In the technical solution provided by the present invention, the valve control adopts a complete dual-redundancy configuration, and the valve control single system can be shut down for maintenance without stopping the DC power transmission system.

[0036] In the technical solution provided by the present invention, the downlink communication adopts the redundant communication + splitter solution, which improves the trigger synchronization. The valve control sets the trigger signal check and link switching functions, which can quickly cut out the "common optical failure" of the valve-controlled optical transmitter without affecting the use of the second control instruction optical fiber.

[0037] In the technical solution provided by the present invention, the uplink communication adopts a sub-module networking solution, which effectively avoids the "frequent optical failure" of the sub-module optical transmitter affecting the status check of other sub-modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a main structural block diagram of a communication system between a flexible DC converter valve submodule and a valve control system according to an embodiment of the present invention;

[0039] Figure 2 4 is a downlink communication link diagram of a communication system between a flexible DC converter valve submodule and a valve control system according to an embodiment of the present invention;

[0040] Figure 3 It is an uplink communication link diagram of the communication system between the flexible DC converter valve submodule and the valve control system in an embodiment of the present invention. DETAILED DESCRIPTION

[0041] The specific implementation modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] As disclosed in the background technology, flexible direct current transmission is a new type of power transmission method after alternating current transmission and conventional direct current transmission. It has significant technical advantages in the fields of large-scale renewable energy grid connection and flexible interconnection of regional power grids, and the DC voltage has also been raised to the ultra-high voltage level (±800kV and above). However, at this voltage level, the number of sub-modules in series in a single bridge arm of a flexible direct current converter valve exceeds one thousand, and the traditional "point-to-point" communication method between the converter valve sub-module and the valve control brings a huge number of optical fibers and an enlarged valve control scale, which in turn greatly increases the construction and operation and maintenance costs of the converter station. It is urgent to study the communication architecture that reduces the communication optical fiber between the converter valve sub-module and the valve control.

[0044] The invention patent "Flexible DC converter valve networking system and control method based on optical distributor" with announcement number CN 202310901435.2 proposes a flexible DC converter valve networking system, but has the following technical defects: (1) Since the feedback information of all converter valve sub-modules in the converter unit group is collected through the passive optical distributor and returned to the valve control system, if a hardware failure of a sub-module control board causes the optical transmitter to continue to "always have light", the status information of other sub-modules will not be returned normally, which may cause the system to shut down; (2) The valve control system is not configured in a dual configuration and does not meet the flexible DC transmission operation and maintenance requirements; (3) The derating of the light intensity of the downlink communication link of the valve control system is not considered.

[0045] In order to improve the above-mentioned problem, the present invention provides a communication system and method between a flexible DC converter valve submodule and a valve control system, including: a first pole control protection unit, a second pole control protection unit, a first converter valve control protection unit, a second converter valve control protection unit, a first valve base interface unit, a second valve base interface unit, a first splitter, a second splitter, and a flexible DC converter valve submodule; the first pole control protection unit is communicatively connected to the second pole control protection unit; the first pole control protection unit is communicatively connected to the first converter valve control protection unit; the second pole control protection unit is communicatively connected to the second converter valve control protection unit; the first converter valve control protection unit, the second converter valve control protection unit, the first valve base interface unit and the second valve base interface unit are cross-redundantly communicated with each other; two trigger channels are arranged between the first valve base interface unit and the first splitter. signal link; two trigger communication links are set between the second valve base interface unit and the second optical splitter; the first optical splitter is connected to the odd-coded flexible DC converter valve submodules through the control instruction communication optical fiber; the second optical splitter is connected to the even-coded flexible DC converter valve submodules through the control instruction communication optical fiber; an interactive communication link is set between two adjacent numbered flexible DC converter valve submodules; each flexible DC converter valve submodule is internally networked through the uplink status information communication optical fiber, the flexible DC converter valve submodules corresponding to the numbers 1 and n-1 are connected to the first valve base interface unit through the uplink status information communication optical fiber, and the flexible DC converter valve submodules corresponding to the numbers 2 and n are connected to the second valve base interface unit through the uplink status information communication optical fiber, and n is the maximum number of the flexible DC converter valve submodule and n is an even number. The technical solution provided by the present invention can improve the communication redundancy while greatly reducing the number of long optical fibers for communication between the flexible DC converter valve submodule and the valve control system. Specifically:

[0046] In the technical solution provided by the present invention, the number of long-distance optical fibers used from the valve control to the converter valve tower is reduced to 4 pairs, which is a significant reduction compared to the number of point-to-point communication optical fibers.

[0047] In the technical solution provided by the present invention, the valve control adopts a complete dual-redundancy configuration, and the valve control single system can be shut down for maintenance without stopping the DC power transmission system.

[0048] In the technical solution provided by the present invention, the downlink communication adopts the redundant communication + splitter solution, which improves the trigger synchronization. The valve control sets the trigger signal check and link switching functions, which can quickly cut out the "common optical failure" of the valve-controlled optical transmitter without affecting the use of the second control instruction optical fiber.

[0049] In the technical solution provided by the present invention, the uplink communication adopts a sub-module networking solution, which effectively avoids the "frequent optical failure" of the sub-module optical transmitter affecting the status check of other sub-modules.

[0050] The above scheme is described in detail below.

[0051] Example 1

[0052] The communication system between the flexible DC converter valve submodule and the valve control system in the embodiment of the present invention mainly includes: a first pole control protection unit, a second pole control protection unit, a first converter valve control protection unit, a second converter valve control protection unit, a first valve base interface unit, a second valve base interface unit, a first optical splitter, a second optical splitter, and a flexible DC converter valve submodule;

[0053] The first pole control protection unit is communicatively connected with the second pole control protection unit;

[0054] The first pole control protection unit is communicatively connected with the first converter valve control protection unit;

[0055] The second pole control protection unit is communicatively connected with the second converter valve control protection unit;

[0056] The first converter valve control and protection unit, the second converter valve control and protection unit, the first valve base interface unit and the second valve base interface unit are cross-redundantly communicated with each other;

[0057] Two trigger communication links are provided between the first valve base interface unit and the first optical splitter;

[0058] Two trigger communication links are provided between the second valve base interface unit and the second optical splitter;

[0059] The first optical splitter is connected to the odd-coded flexible DC converter valve submodules through control instruction communication optical fibers respectively;

[0060] The second optical splitter is connected to the flexible DC converter valve submodules with even number coding through control instruction communication optical fibers respectively;

[0061] An interactive communication link is provided between two adjacent numbered flexible DC converter valve submodules;

[0062] The flexible DC converter valve submodules are internally networked through an uplink status information communication optical fiber. The flexible DC converter valve submodules corresponding to numbers 1 and n-1 are connected to the first valve base interface unit through the uplink status information communication optical fiber. The flexible DC converter valve submodules corresponding to numbers 2 and n are connected to the second valve base interface unit through the uplink status information communication optical fiber. n is the maximum value of the flexible DC converter valve submodule number and n is an even number.

[0063] In this embodiment, the pole control protection unit, the converter valve control protection unit, and the valve base interface unit are arranged at ground potential, and each flexible DC converter valve submodule and the optical splitter are arranged on a high-potential valve tower.

[0064] In this embodiment, the converter valve control and protection unit is used to calculate the switching instructions of each flexible DC converter valve sub-module by using a sub-module voltage balancing algorithm according to the bridge arm voltage reference wave sent by the pole control unit and the status information of each flexible DC converter valve sub-module, and send it to the valve base interface unit through cross redundant communication.

[0065] In this embodiment, the communication timing and communication content of the two triggered communication links are the same.

[0066] In this embodiment, the two trigger communication links are both provided with a trigger backcheck monitoring unit for detecting a trigger communication link failure.

[0067] In this embodiment, when it is detected that the trigger communication link sends constant light, it is determined that the trigger communication link is faulty.

[0068] In this embodiment, the interactive communication link is used to transparently transmit the sub-module control instruction of the optical splitter received by the flexible DC converter valve sub-module at one end of the communication link to the flexible DC converter valve sub-module at the other end of the communication link.

[0069] In this embodiment, the flexible DC converter valve submodules corresponding to numbers 1 and n-1 are connected to the uplink reporting status information communication optical fiber in the first valve base interface unit through the uplink reporting status information communication optical fiber, which is used to upload the submodule status information summarized by the flexible DC converter valve submodules corresponding to numbers 1 and n-1 to the first valve base interface unit; the flexible DC converter valve submodules corresponding to numbers 2 and n are connected to the uplink reporting status information communication optical fiber in the first valve base interface unit through the uplink reporting status information communication optical fiber, which is used to upload the submodule status information summarized by the flexible DC converter valve submodules corresponding to numbers 2 and n to the second valve base interface unit.

[0070] In one embodiment, the submodule status information includes at least one of the following: submodule voltage, component fault information, and IGBT switching status.

[0071] In a specific embodiment, Figure 1 It is a main structural block diagram of a communication system between a flexible DC converter valve submodule and a valve control system according to an embodiment of the present invention. Figure 1 In the present invention, the valve control system is configured in two layers, where: (1) the valve control and protection unit (VCP) is configured in redundancy with A and B systems, and is connected to the A and B systems of the pole control and protection unit (PCP) respectively; (2) the valve base interface unit (VBI) is fully redundant in hardware and is the main system.

[0072] The pole control and protection unit is responsible for the control and protection of the entire converter station equipment (such as converter valves, transformers, and various switchgear lights). After collecting analog information such as AC voltage and current, it generates the voltage command that each bridge arm of the flexible DC converter valve should output through closed-loop calculation, and sends this command to the VCP unit of the valve control system.

[0073] The VCP unit is responsible for the control and protection of the entire converter valve submodule. Based on the bridge arm voltage reference wave sent by the pole control unit, the submodule voltage sent by the receiving submodule, and the bridge arm current at this moment, the switching instructions of all submodules are calculated through the submodule voltage balancing algorithm, and sent to the two groups of VBI units with full redundant configuration through cross-redundant communication.

[0074] The VBI unit is the communication hub between the VCP unit and the converter valve submodule. Two groups of VBI units receive instructions from the VCP unit main system and are designed with a synchronization mechanism with the VCP unit main system to ensure the synchronization of downlink communication between the two groups of VBI units and the converter valve submodule. The VBI unit also receives status information sent by the submodule, processes it and sends it to the VCP unit for voltage equalization algorithm and converter valve protection calculation. At the same time, the VBI unit monitors the communication status of the downlink trigger check and the uplink communication link of the submodule in real time and responds accordingly.

[0075] The two groups of optical splitters are also fully duplexed, connected to the VBI units on the top and connected to the odd-numbered and even-numbered converter valve submodules on the bottom.

[0076] Interactive communication is designed between the submodules with adjacent numbers (odd numbers and even numbers), and the submodule control instructions of the optical splitter received by each are transparently transmitted to the other party, thereby improving the redundant configuration of the trigger instruction.

[0077] The status information returned by the converter valve submodule (submodule voltage, various component faults, IGBT switching status, etc.) is locally networked and merged into the port submodule. It is then uploaded to two groups of VBI units respectively, and the information returned to the VBI units is exactly the same.

[0078] The downlink control command communication optical fiber and the uplink status information communication optical fiber between each VBI unit and the converter valve submodule are both configured in duplicate, further improving the communication redundancy.

[0079] Example 2

[0080] The present invention provides a method for a communication system based on a flexible DC converter valve submodule and a valve control system, wherein the method for a communication system based on a flexible DC converter valve submodule and a valve control system comprises:

[0081] When the first pole control protection unit, the first optical splitter, or the two trigger communication links provided between the first valve base interface unit and the first optical splitter fail, the flexible DC converter valve submodule corresponding to the odd number obtains its own switching instruction through the flexible DC converter valve submodule corresponding to the even number connected thereto;

[0082] When the second pole control protection unit, the second splitter, or the two trigger communication links between the second valve base interface unit and the second splitter fail, the flexible DC converter valve submodule corresponding to the even number obtains its own switching instruction through the flexible DC converter valve submodule corresponding to the odd number connected to it.

[0083] In a specific embodiment, Figure 2 As shown, the valve-controlled VCP unit dual system and the two groups of VBI units adopt a cross communication method, and the VBI units all execute the control instructions and communication timing of the VCP main system.

[0084] Two-way trigger communication is designed between the VBI unit and the optical splitter. The communication timing and communication content are exactly the same, which can improve the richness of the light intensity and greatly reduce the risk of communication abnormality caused by weak light.

[0085] Each communication channel between VBI and the optical splitter is designed with a trigger back-check monitoring function. If VBI detects an abnormality in a certain trigger communication channel (such as sending normal light), it will block the output of this channel through the internal redundant link switching logic, and the second trigger communication link of VBI will continue to control the converter valve submodule through the optical splitter.

[0086] If a certain VBI group fails or the 2-way trigger communication optical fiber from a certain VBI group to the optical splitter fails or a certain optical splitter fails, the converter valve submodule will obtain its own control instructions through the cross-trigger optical fiber between adjacent submodules without affecting the system operation.

[0087] Due to the dual configuration of the valve-controlled VCP, the VBI, the communication link from VBI to the splitter, and the splitter are all fully redundant, which can realize single-system fault maintenance of the valve-controlled equipment during system operation. Before system maintenance, the operating mode is adjusted to control the current valve control so that control instructions are not sent to the sub-module. The sub-module automatically switches the control link to another set of valve-controlled equipment.

[0088] The use of the optical splitter and the synchronization mechanism of two groups of VBI units further improves the synchronization of control instructions to sub-modules, thereby improving the consistency of sub-module triggering and improving the overall electrical performance of the converter valve.

[0089] In a specific embodiment, Figure 3 As shown in the figure, the converter valve submodule realizes the sharing of operation status information through internal interactive networking and time-division multiplexing communication, and centralizes the status information to Figure 3 SM1, SM2, SMn-1 and SMn in the VBI unit are then returned to two groups through high-speed communication.

[0090] There are two uplink communication optical fibers between the converter valve submodule and each group of VBI units. The communication content and communication timing are the same. VBI obtains uplink status information according to the principle of "use whichever is received first, and use the first one when two are received at the same time". The physical meaning of "received" mainly includes communication verification passed, communication interval correct, and a new frame of data.

[0091] The two groups of VBI chassis send status information to the dual systems of VCP units through cross communication, thereby improving communication redundancy.

[0092] The VCP unit uses the received sub-module operation status information to calibrate the sub-module control instructions for the next cycle.

[0093] The uplink communication adopts a networking solution instead of a splitter solution. When the uplink communication of a submodule becomes "always light" due to a fault, the submodule will be identified as a fault inside the submodule, which will not affect the monitoring of the status of other submodules.

[0094] Example 3

[0095] Based on the same inventive concept, the present invention also provides a computer device, which includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function, so as to implement the steps of the method of the communication system between a flexible DC converter valve submodule and a valve control system in the above embodiment.

[0096] Example 4

[0097] Based on the same inventive concept, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It can be understood that the computer-readable storage medium here can include both built-in storage media in a computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the method of a communication system between a flexible DC converter valve submodule and a valve control system in the above embodiment.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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 The steps for the functions specified in one or more boxes.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A communication system between a flexible DC converter valve submodule and a valve control system, characterized in that: The system comprises: a first pole control protection unit, a second pole control protection unit, a first converter valve control protection unit, a second converter valve control protection unit, a first valve base interface unit, a second valve base interface unit, a first optical splitter, a second optical splitter, and a flexible DC converter valve submodule; The first pole control protection unit is communicatively connected with the second pole control protection unit; The first pole control protection unit is communicatively connected with the first converter valve control protection unit; The second pole control protection unit is communicatively connected with the second converter valve control protection unit; The first converter valve control and protection unit, the second converter valve control and protection unit, the first valve base interface unit and the second valve base interface unit are cross-redundantly communicated with each other; Two trigger communication links are provided between the first valve base interface unit and the first optical splitter; Two trigger communication links are provided between the second valve base interface unit and the second optical splitter; The first optical splitter is connected to the odd-coded flexible DC converter valve submodules through control instruction communication optical fibers respectively; The second optical splitter is connected to the flexible DC converter valve submodules with even number coding through control instruction communication optical fibers respectively; An interactive communication link is provided between two adjacent numbered flexible DC converter valve submodules; The flexible DC converter valve submodules are internally networked through an uplink status information communication optical fiber. The flexible DC converter valve submodules corresponding to numbers 1 and n-1 are connected to the first valve base interface unit through the uplink status information communication optical fiber. The flexible DC converter valve submodules corresponding to numbers 2 and n are connected to the second valve base interface unit through the uplink status information communication optical fiber. n is the maximum value of the flexible DC converter valve submodule number and n is an even number.

2. The system according to claim 1, characterized in that The pole control protection unit, the converter valve control protection unit, and the valve base interface unit are arranged at ground potential, and the flexible DC converter valve submodules and the optical splitter are arranged on a high-potential valve tower.

3. The system according to claim 1, characterized in that The converter valve control and protection unit is used to calculate the switching instructions of each flexible DC converter valve submodule by using a submodule voltage balancing algorithm according to the bridge arm voltage reference wave sent by the pole control unit and the status information of each flexible DC converter valve submodule, and send it to the valve base interface unit through cross redundant communication.

4. The system according to claim 1, characterized in that The communication timing and communication content of the two triggered communication links are the same.

5. The system according to claim 4, characterized in that The two trigger communication links are both provided with a trigger backcheck monitoring unit for detecting a trigger communication link failure.

6. The system according to claim 5, characterized in that When it is detected that the trigger communication link sends constant light, it is determined that the trigger communication link is faulty.

7. The system according to claim 1, characterized in that The interactive communication link is used to transparently transmit the sub-module control instruction of the optical splitter received by the flexible DC converter valve sub-module at one end of the communication link to the flexible DC converter valve sub-module at the other end of the communication link.

8. The system of claim 1, wherein: The flexible DC converter valve submodules corresponding to numbers 1 and n-1 are connected to the uplink status information communication optical fiber in the first valve base interface unit through the uplink status information communication optical fiber for uploading the submodule status information summarized by the flexible DC converter valve submodules corresponding to numbers 1 and n-1 to the first valve base interface unit; the flexible DC converter valve submodules corresponding to numbers 2 and n are connected to the uplink status information communication optical fiber in the first valve base interface unit through the uplink status information communication optical fiber for uploading the submodule status information summarized by the flexible DC converter valve submodules corresponding to numbers 2 and n to the second valve base interface unit.

9. The system according to claim 8, characterized in that The submodule status information includes at least one of the following: submodule voltage, component fault information, and IGBT switching status.

10. A method for a communication system between a flexible DC converter valve submodule and a valve control system based on any one of claims 1 to 9, characterized in that: The method comprises: When the first pole control protection unit, the first optical splitter, or the two trigger communication links provided between the first valve base interface unit and the first optical splitter fail, the flexible DC converter valve submodule corresponding to the odd number obtains its own switching instruction through the flexible DC converter valve submodule corresponding to the even number connected thereto; When the second pole control protection unit, the second splitter, or the two trigger communication links between the second valve base interface unit and the second splitter fail, the flexible DC converter valve submodule corresponding to the even number obtains its own switching instruction through the flexible DC converter valve submodule corresponding to the odd number connected to it.

11. A computer device, characterized in that: include: one or more processors; The processor is configured to execute one or more programs; When the one or more programs are executed by the one or more processors, the method of the communication system between the flexible DC converter valve sub-module and the valve control system as claimed in claim 10 is implemented.

12. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the method of the communication system between the flexible DC converter valve submodule and the valve control system as claimed in claim 10 is implemented.

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