CN112187396A - Communication system and method suitable for flexible direct current converter valve - Google Patents
Communication system and method suitable for flexible direct current converter valve Download PDFInfo
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- CN112187396A CN112187396A CN201910605779.2A CN201910605779A CN112187396A CN 112187396 A CN112187396 A CN 112187396A CN 201910605779 A CN201910605779 A CN 201910605779A CN 112187396 A CN112187396 A CN 112187396A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/08—Intermediate station arrangements, e.g. for branching, for tapping-off
- H04J3/085—Intermediate station arrangements, e.g. for branching, for tapping-off for ring networks, e.g. SDH/SONET rings, self-healing rings, meashed SDH/SONET networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
- H02M1/092—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices the control signals being transmitted optically
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention relates to a communication system and a method suitable for a flexible direct current converter valve, wherein the system comprises a valve control system communication unit and sub-module communication units of the converter valve, the sub-module communication units on each converter valve bridge arm are divided into at least two groups, the number of the sub-module communication units in each group is at least three, each group of sub-module communication units is connected end to form a ring network, at least one sub-module communication unit in each ring network is correspondingly connected with the sub-module communication units with the corresponding number on the adjacent ring network one by one, and the valve control system communication unit is connected with at least one sub-module communication unit in at least one ring network. The method comprises the following steps: the valve control system issues control information to the bridge arm sub-modules in a broadcast mode, each sub-module communication unit directly forwards the control information, and the forwarding rule is as follows: the sub-module communication unit forwards the control information according to the state of the connecting channel and the principle of the first ring and the second adjacent ring. The system and the method of the invention can save cost and improve the communication reliability and fault-tolerant capability of equipment.
Description
Technical Field
The invention belongs to the technical field of high-voltage flexible direct current transmission, and particularly relates to a communication system and method suitable for a flexible direct current converter valve.
Background
The flexible direct current converter valve is a core device for realizing alternating current-direct current conversion, a multi-level modular design is usually adopted, and due to the limitation of electrical characteristics of a power device, when the voltage level of a direct current system is higher, a large number of sub-modules are required to be connected in series in a single bridge arm of the converter valve. In the design of the current valve control system, valve control needs to be directly connected with each submodule in a communication mode. In actual engineering, the secondary equipment room where the valve control is located is far away from the converter valve, so that a large number of long optical fibers and sub-modules are required to be connected and communicated correspondingly, the field construction workload is large, and the construction difficulty is large. And according to the design of the existing communication architecture, the valve control and the sub-modules are connected by a single channel, so that once an optical fiber channel fails, the sub-modules can fail, and the availability of the system is reduced. Individual extreme conditions even cause system outage, and the stability and safety of the flexible direct current transmission project are seriously influenced.
The invention patent with publication number CN 105610492B discloses an optical fiber communication system and method for a dc transmission converter valve monitoring system, in which a trigger pulse distribution unit and a return signal receiving unit are arranged on a valve control system side, a first optical splitter and a second optical splitter are arranged on a converter valve assembly side, the trigger pulse distribution unit is connected to the first optical splitter through an optical fiber, the return signal receiving unit is connected to the second optical splitter, the first optical splitter is connected to the trigger monitoring units of each converter valve submodule and is used for distributing control information to the trigger monitoring units of each converter valve submodule, and the second optical splitter is connected to the trigger monitoring units of each converter valve submodule and is used for synthesizing status information of each converter valve submodule into one path and sending the path of status information to the return signal receiving unit through an optical fiber. Although the communication system adopts the mode of time division multiplexing during code division multiplexing to reduce the number of optical fiber connections among devices, a single channel is arranged between the sub-module and the valve control system, and the problem of low communication reliability still exists.
The utility model patent with publication number CN 206673825U discloses that the optical fiber communication interface circuit of each power module includes an FPGA chip, three optical fiber transmitters and three optical fiber receivers, and the FPGA chip connects the monitoring circuit, three optical fiber transmitters and three optical fiber receivers of each power module. Two groups of optical fiber transceivers in each power module are respectively connected with the optical fiber transceivers in the adjacent power modules on the left side and the right side, and one group of optical fiber transceivers are used for being connected with the converter valve controller. Therefore, once communication failure occurs between the power module and the valve control system, the communication connection mode can utilize the communication channel between the adjacent power module and the adjacent valve control system to carry out communication. Although the communication mode can improve the reliability of communication, a huge number of long optical fibers still need to be arranged between the sub-modules and the valve control system, and the equipment cost is high.
Disclosure of Invention
The invention provides a communication system and a communication method suitable for a flexible direct current converter valve, and aims to solve the problems of low reliability and high equipment cost of the conventional communication system of the flexible direct current converter valve.
In order to solve the technical problem, the communication system suitable for the flexible direct current converter valve comprises a valve control system communication unit and sub-module communication units of the converter valve, for each converter valve bridge arm, the sub-module communication units on the converter valve bridge arm are at least divided into two groups, the number of the sub-module communication units in each group is at least three, the sub-module communication units in each group are connected end to form a ring network, at least one sub-module communication unit in each ring network is correspondingly connected with the sub-module communication units with the corresponding number on the adjacent ring network one by one, and the valve control system communication unit is connected with at least one sub-module communication unit in at.
The communication system of the invention has the advantages that: the valve control system does not need to be in communication connection with all sub-modules of a converter valve bridge arm, so that the cost can be saved; redundant communication between the sub-modules and the valve control system can be realized, and the communication reliability is improved. And a multi-ring network coupling network architecture is adopted among sub-modules in the bridge arm, so that the running reliability and fault-tolerant capability of the equipment can be greatly improved.
In order to further improve the communication reliability, at least two sub-module communication units in each ring network are correspondingly connected with the sub-module communication units with the corresponding number on the adjacent ring network.
In order to further improve the communication reliability, the valve control system communication unit is connected with the sub-module communication units in at least two ring networks.
In order to further improve the communication reliability, the valve control system communication unit is connected with at least one sub-module communication unit in each ring network.
In order to further improve the communication reliability, the number of the sub-module communication units in each ring network is equal, and each sub-module communication unit in each ring network is correspondingly connected with each sub-module communication unit in the adjacent ring network one by one.
In order to improve the communication efficiency and the communication quality, the ring network is an optical fiber ring network, and each sub-module communication unit comprises a light receiving port and a light sending port.
In order to improve the communication efficiency and the communication quality, the sub-module communication unit is connected with the valve control system communication unit through optical fibers, and the valve control system communication unit comprises a light receiving port and a light transmitting port.
The communication method applicable to the flexible direct current converter valve comprises the following steps: the valve control system issues control information of the bridge arm sub-modules in a broadcast mode, each sub-module communication unit forwards the received control information to other sub-module communication units according to a set rule when receiving the control information, and the set rule is as follows: the sub-module communication unit forwards the control information according to the state of the connecting channel and the principle of the first ring and the second adjacent ring.
The communication method of the invention has the advantages that: all the submodule communication units are not required to be connected with the valve control system communication unit, so that the cost can be saved; the redundant communication between the sub-modules and the valve control system is realized, the communication reliability is improved, and the reliability and fault-tolerant capability of equipment operation can be greatly improved.
In order to improve the reliability of communication, each sub-module communication unit uploads the state information of the corresponding sub-module in a time-sharing manner.
In order to save resources, the valve control system and the bridge arm sub-modules are in periodic intercommunication.
Drawings
FIG. 1 is a system architecture diagram of a communication system according to the present invention;
FIG. 2 is a schematic view of a communication architecture of a communication unit and a valve control system of a submodule on a bridge arm of the invention;
FIG. 3 is a schematic diagram of an optical fiber connection of a communication unit of a bridge arm sub-module according to the present invention;
the circles in fig. 1 and 2 represent sub-module communication units, the numbers in the circles represent serial numbers of the sub-module communication units, the solid lines with double arrows represent communication connection lines, LER1, LER2 and LER3 in fig. 3 all represent optical fiber interfaces, and the solid lines with double arrows represent communication connection lines.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying fig. 1-3.
Embodiments of the communication system of the invention suitable for flexible direct current converter valves
The communication system comprises valve control system communication units and converter valve bridge arm submodule communication units, wherein for each converter valve bridge arm, submodule communication units on the converter valve bridge arm are divided into at least two groups, the number of each group of submodule communication units is at least three, each group of submodule communication units is connected end to form a looped network, at least one submodule communication unit in each looped network is correspondingly connected with a corresponding number of submodule communication units on an adjacent looped network one by one, and the valve control system communication units are connected with at least one submodule communication unit in at least one looped network.
As shown in fig. 1, this is a communication architecture of a bridge arm submodule and a valve control system, in the figure, a circle represents a bridge arm submodule of a converter valve, a box represents a communication unit in the valve control system, and communication units of submodules in a virtual frame are connected to form a ring network. The number of the sub-module communication units in each ring network can be the same or different, but the number of the sub-module communication units in each ring network is at least three. At least two submodule communication units in each ring network are correspondingly connected with submodule communication units in adjacent ring networks, and the valve control system communication unit is in communication connection with at least one ring network. In fig. 1, a sub-module communication unit 1-1 in a ring network 1 is connected with a sub-module communication unit 2-3 in a ring network 2, and a sub-module communication unit 1-5 in the ring network 1 is connected with a sub-module communication unit 2-4 in the ring network 2; the sub-module communication unit 2-2 in the ring network 2 is connected with the sub-module communication unit 3-1 in the ring network 3, and the sub-module communication unit 2-1 in the ring network 2 is connected with the sub-module communication unit 3-2 in the ring network 3. The valve control system communication unit is connected with the sub-module communication unit 1-4 in the ring network 1, and the valve control system communication unit is connected with the sub-module communication unit 3-2 in the ring network 3.
Of course, as other embodiments, other sub-module communication units in the ring network 1 may also be connected to the sub-module communication unit in the ring network 2. Optimally, the number of the sub-module communication units in each ring network is equal, and each sub-module communication unit in each ring network is connected with each sub-module communication unit in the adjacent ring network in a one-to-one correspondence manner. The equalization here means that the number of the sub-module communication units of each ring network is mutually different, and each difference is not more than 1. If the number of the sub-module communication units of two adjacent ring networks is not equal, the sub-module communication units in the ring network with less sub-module communication units and the sub-module communication units with the corresponding number in the ring network with more sub-module communication units can be correspondingly connected one by one.
As another embodiment, the valve control system communication unit may be communicatively connected to each ring network, or the valve control system communication unit may be connected to a plurality of sub-module communication units in one ring network.
Fig. 2 shows an optimal communication connection mode between the sub-module communication units on the bridge arms and the valve control system, for each bridge arm, all the sub-module communication units on the bridge arm are divided into two groups, and each group of sub-module communication units are connected end to form a ring network, namely a ring network 1 and a ring network 2. And the sub-module communication units in the ring network 1 and the ring network 2 are correspondingly connected one by one. That is, if the serial numbers 1, 3, 5, and 7 … … 2n-1 are sequentially assigned to each sub-module in the ring network 1, n is greater than or equal to 1; and sequentially distributing serial numbers 2, 4, 6 and 8 … … 2n to each submodule in the ring network 1, wherein n is more than or equal to 1. Then, the sub-module communication units 2n-1 in the ring network 1 are respectively connected with the sub-module communication units 2n in the adjacent ring network 2 to form a coupling network. In the communication mode, the node positions of all the sub-modules in the bridge arm in the ring network are the same, and the information communication between the valve control and all the bridge arm sub-modules can be realized only by connecting any one sub-module communication unit in any one ring network with the valve control system communication unit. In practical application, redundant connection can be realized from the two groups of optical fibers connected by the valve control system to the sub-module communication units of different ring networks according to requirements, namely the valve control system communication unit is connected with one sub-module communication unit in the ring network 1, and the valve control system communication unit is connected with one sub-module communication unit in the ring network 2.
In the embodiment, a communication mode of the valve control on the bridge arm and the bridge arm submodule is provided, and in actual engineering, the converter valve comprises six bridge arms, namely the valve control needs to be connected and communicated with six groups of bridge arms according to the embodiment.
When the optical fiber communication is performed between the sub-module and the valve control system, the sub-module communication unit comprises a light receiving port and a light sending port, and the number of the light receiving ports and the light sending ports in each sub-module communication unit can be designed according to actual needs. As shown in fig. 2, the serial numbers 3, 4, 5, and 6 of the sub-module communication units need to be connected with the adjacent sub-module communication units in the ring network, and also need to be connected with the sub-module communication units in the adjacent ring network, their light receiving ports may be set to be at least 3, and the light sending ports may also be set to be at least 3. For the sub-module communication units with serial numbers 1 and 2, besides the connection with the adjacent sub-module communication unit in the ring network, the connection with the sub-module communication unit in the adjacent ring network, and the connection with the valve control system communication unit, at least 4 light receiving ports and 4 light transmitting ports can be arranged. For other embodiments, the light receiving port and the light sending port of each sub-module communication unit are arranged according to actual needs as long as the connection requirements can be met, and the arrangement of the light receiving port and the light sending port of the valve control system communication unit is also the same, and is not described in detail here.
Fig. 3 shows a fiber connection manner of the sub-module communication unit, wherein each sub-module communication unit includes three sets of fiber interfaces, which are LER1, LER2 and LER3, respectively, wherein each set of fiber interfaces can be further divided into a light receiving port R and a light transmitting port LE. For example, the LER1 includes a light transmitting port LE1 and a light receiving port R1 inside. The submodule communication unit is denoted M, the optical fibre connections are as follows: within ring network 1, M1_ LER1 is connected to M3_ LER2, M3_ LER1 is connected to M5_ LER2, M5_ LER1 is connected to M1_ LER 2; within ring network 2, M2_ LER1 is connected to M4_ LER2, M4_ LER1 is connected to M6_ LER2, M6_ LER1 is connected to M2_ LER 2; the coupling network is M1_ LER3 connected to M2_ LER3, M3_ LER3 connected to M4_ LER3, and M5_ LER3 connected to M6_ LER 3.
Embodiment of communication method applicable to flexible direct current converter valve
The communication method of the invention is based on the system embodiment, and specifically comprises the following steps: for the control stage, the valve control system issues control information of the bridge arm sub-modules in a broadcast manner, each sub-module communication unit forwards the received control information to other sub-module communication units according to a set rule when receiving the control information, and the set rule is as follows: the sub-module communication unit forwards the control information according to the state of the connecting channel and the principle of the first ring and the second adjacent ring.
In order to improve the communication reliability, all communication in the network adopts asynchronous serial coding communication, the communication between the valve control and the bridge arm is periodic interactive communication, and each communication period is divided into two stages: a control stage and a return stage;
and in the control stage, the control information controlled by the valve to the bridge arm sub-modules is issued in a broadcast mode, and each sub-module directly forwards the command after receiving the command. The sub-module executes command information according to the state of the connecting channel and the principle of a first local ring and a second external ring;
and in the return stage, a time slot is distributed to each submodule, and each submodule uploads respective state information in a time-sharing manner through a communication unit of each submodule according to the time sequence.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. The communication system is characterized in that for each converter valve bridge arm, the sub-module communication units on the converter valve bridge arm are divided into at least two groups, the number of the sub-module communication units in each group is at least three, the sub-module communication units in each group are connected end to form a ring network, at least one sub-module communication unit in each ring network is connected with the sub-module communication units with the corresponding number on the adjacent ring network in a one-to-one correspondence mode, and the valve control system communication unit is connected with at least one sub-module communication unit in at least one ring network.
2. The communication system suitable for the flexible direct current converter valve according to claim 1, wherein at least two sub-module communication units in each ring network are correspondingly connected with a corresponding number of sub-module communication units on an adjacent ring network.
3. The communication system for the flexible direct current converter valve according to claim 1, wherein the valve control system communication unit is connected with the sub-module communication units in at least two ring networks.
4. The communication system for the flexible direct current converter valve according to claim 3, wherein the valve control system communication unit is connected with at least one sub-module communication unit in each ring network.
5. The communication system suitable for the flexible direct current converter valve according to any one of claims 1 to 4, wherein the number of the sub-module communication units in each ring network is equal, and each sub-module communication unit in each ring network is connected with each sub-module communication unit in an adjacent ring network in a one-to-one correspondence manner.
6. The communication system suitable for the flexible direct current converter valve according to any one of claims 1 to 4, wherein the ring network is an optical fiber ring network, and each sub-module communication unit comprises a light receiving port and a light sending port.
7. The communication system suitable for the flexible direct current converter valve according to any one of claims 1 to 4, wherein an optical fiber connection is adopted between the sub-module communication unit and the valve control system communication unit, and the valve control system communication unit comprises a light receiving port and a light sending port.
8. A communication method for a flexible direct current converter valve based on the communication system for the flexible direct current converter valve as claimed in claim 1, wherein the method comprises: the valve control system issues control information of the bridge arm sub-modules in a broadcast mode, each sub-module communication unit forwards the received control information to other sub-module communication units according to a set rule when receiving the control information, and the set rule is as follows: the sub-module communication unit forwards the control information according to the state of the connecting channel and the principle of the first ring and the second adjacent ring.
9. The communication method for the flexible direct current converter valve according to claim 8, wherein each sub-module communication unit uploads the state information of the corresponding sub-module in a time-sharing manner.
10. The communication method for the flexible direct current converter valve according to claim 8 or 9, wherein the valve control system and the bridge arm sub-modules are in periodic mutual communication.
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| CN114188967A (en) * | 2022-01-10 | 2022-03-15 | 南京南瑞继保电气有限公司 | Power grid support type active current converter, control method thereof and current conversion system |
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