CN108880858B - Protocol communication system for high-voltage direct-current transmission - Google Patents
Protocol communication system for high-voltage direct-current transmission Download PDFInfo
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- 230000006854 communication Effects 0.000 title claims abstract description 100
- 238000004891 communication Methods 0.000 title claims abstract description 95
- 230000005540 biological transmission Effects 0.000 title claims abstract description 50
- 238000012545 processing Methods 0.000 claims abstract description 17
- 238000013461 design Methods 0.000 claims abstract description 4
- 239000000872 buffer Substances 0.000 claims description 13
- 230000000737 periodic effect Effects 0.000 claims description 6
- 230000035772 mutation Effects 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 230000003993 interaction Effects 0.000 abstract description 6
- 230000004048 modification Effects 0.000 abstract description 3
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- 238000006243 chemical reaction Methods 0.000 description 4
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
- H04L41/0663—Performing the actions predefined by failover planning, e.g. switching to standby network elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/50—Queue scheduling
- H04L47/62—Queue scheduling characterised by scheduling criteria
- H04L47/6215—Individual queue per QOS, rate or priority
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
- H04L69/161—Implementation details of TCP/IP or UDP/IP stack architecture; Specification of modified or new header fields
- H04L69/162—Implementation details of TCP/IP or UDP/IP stack architecture; Specification of modified or new header fields involving adaptations of sockets based mechanisms
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- H02J13/0013—
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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
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/16—Electric power substations
Abstract
The invention relates to a protocol communication system for high-voltage direct-current power transmission, and belongs to the technical field of high-voltage direct-current power transmission. The protocol communication system is arranged between the high-voltage direct-current transmission control protection system and each protection information substation, comprises a runtime system, a protocol data initialization module, a network communication driving module, a protocol communication main processing module and an application layer data interface module, adopts double Ethernet interfaces on the aspect of hardware design, realizes information interaction between the high-voltage direct-current transmission control protection system and each protection information substation, separates an application program from a bottom layer communication processing program on the aspect of software design, and improves the program modification reliability and the working efficiency.
Description
Technical Field
The invention relates to a protocol communication system for high-voltage direct-current power transmission, and belongs to the technical field of high-voltage direct-current power transmission.
Background
In conventional and extra-high voltage direct current transmission projects, information interaction such as state quantity, analog quantity, sequence events, fault recording and broadcasting data and the like is required between the control protection equipment and the information protection substation, and strict requirements are imposed on the correctness and reliability of the data. The traditional direct current transmission control protection system does not have the function of accessing an alternating current protection information sub-network due to history and technical circuit reasons, and protection information cannot be smoothly uploaded to a protection information substation, which is contradicted with the requirement of realizing the communication with a third party protection information substation by adopting a standard communication protocol at the present stage. At present, the control protection system and the communication of the background and the telecontrol are in double configuration, so that the reliability of data transmission is greatly improved, but the control protection system and the information protection substation do not have a double-network communication processing function, so that the communication is interrupted for a long time when a hardware fault occurs, and the communication reliability is not high. Because of the difficulty of the direct current engineering project, the large number of protection devices and the frequent change of engineering application requirements, a software method with short development time, easy programming and strong adaptability is needed to realize the communication function.
Disclosure of Invention
The invention aims to provide a protocol communication system for high-voltage direct-current power transmission, which solves the problem that the conventional control protection equipment and an information protection substation cannot communicate normally and timely.
The present invention provides a protocol communication system for high voltage dc transmission to solve the above technical problems, the protocol communication system is arranged between the high-voltage direct-current transmission control protection system and each protection information substation, comprises a runtime system, a protocol data initialization module, a network communication driving module, a protocol communication main processing module and an application layer data interface module, the runtime system is used for analyzing and executing graphical programming tool codes, managing and scheduling tasks, the protocol data initialization module is used for initializing protocol information body data, the network communication driving module is used for configuring communication board card information, the protocol communication main processing module is used for calling a communication main processing program periodically, and the application layer data interface module is used for leading in data required to be transmitted or received by a user to complete interface work of user application data and a protocol processing program part.
Furthermore, in order to improve the reliability of communication, the protocol communication main processing module adopts two mutually standby links to realize the communication between the high-voltage direct-current transmission control protection system and the protection information substation.
Further, in order to better implement data transmission, the protocol communication system further includes a message transmission buffer, and the application layer data interface module transmits information to the protection information substation through the message transmission buffer.
Further, in order to realize the priority sending of important messages and ensure the timely sending of protection action information, the message sending buffer area sends the messages to the protection information substation according to a set priority order.
Further, in order to implement the sending of different data, the priority setting sequence is: the priority of protection action information, sequence events and mutation uploading data is higher than that of general calling, inquiry and periodic data, and the priority of the general calling, inquiry and periodic data is higher than that of fault recording and broadcasting data.
In order to realize the separation of the application program and the bottom layer communication processing program and improve the program modification reliability and the working efficiency, the protocol communication system adopts the IEC61131 graphical design language to carry out communication program design.
Drawings
Fig. 1 is a schematic diagram of a dual-network communication hardware architecture of a protocol communication system for high-voltage direct-current power transmission;
fig. 2 is a schematic diagram of main functional modules of a high-voltage direct-current power transmission protocol communication system applied to an HCM3000 system;
fig. 3 is a schematic diagram of a processing mechanism of dual-network communication software of a protocol communication system for high-voltage direct-current power transmission;
fig. 4 is a flow chart of data receiving and data analyzing of a protocol communication system for high-voltage direct-current power transmission;
fig. 5 is a flow chart of data transmission of a protocol communication system for high voltage direct current transmission;
fig. 6 is a schematic diagram of the HCM3000 system message conversion to IEC60870-5-103 specification new message sending edit window.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
The protocol communication system for high-voltage direct-current transmission is arranged between a high-voltage direct-current transmission control protection system and each protection information substation as shown in figure 1 and is used for realizing communication between the high-voltage direct-current transmission control protection system and each protection information substation. The high-voltage direct-current power transmission protocol communication system adopts a 10M/100M Ethernet interface to realize hardware transmission, communication links are configured on a physical channel, in order to realize the reliability of communication, the number of the 10M/100M Ethernet interfaces is two to realize the redundancy of hardware, the number of the communication links is two, namely LAN1 and LAN2, the two links are mutually standby, the high-voltage direct-current power transmission control protection system transmits information with each protection information substation through the Ethernet interfaces and the communication links, and the two links are not interfered with each other, when one communication link has a hardware fault, the communication can be prevented from being interrupted for a long time due to the fault of the link with the substation, and therefore the reliability of the communication between the control protection system and the protection information substation is improved.
The application program and the bottom layer communication processing program are separated, the structure of the application program and the bottom layer communication processing program can be divided into two parts, namely an IEC60870-5-103 bottom layer communication processing part and an application layer message interface part, as shown in figure 2, a user invisible part is arranged in a dotted line frame, and the communication main processing program is periodically called through an IEC60870-5-103 protocol communication main processing module; the other part is a user visible part, namely application layer communication data interface function blocks which are responsible for leading data required to be transmitted or received by a user into a module of an IEC60870-5-103 protocol to finish the interface work of the user application data and the protocol processing program part. The high-voltage direct-current transmission protocol communication system comprises a SMART PLC operation system, a protocol data initialization module, a network communication driving module, an IEC60870-5-103 protocol communication main processing program, an application layer data interface module and an exception handling and testing module. The system is used for analyzing and executing graphical programming tool codes, managing and scheduling tasks in a running process, the protocol data initialization module is used for initializing protocol information body data, the network communication driving module is used for configuring communication board card information, the protocol communication main processing module is used for calling a communication main processing program periodically, the period can be configured by a user, and the application layer data interface module is used for leading in data required to be transmitted or received by the user to complete interface work of user application data and the protocol processing program.
In the following, an HCM3000 system is taken as an example of a control protection system, and the high-voltage direct-current transmission protocol communication system of the present invention is applied between the HCM3000 system and each protection substation, as shown in fig. 2, the HCM3000 system and the protection information substation perform interaction of information such as state quantity, analog quantity, soft pressure plate, sequence event, fault recording data, and the like through the high-voltage direct-current transmission protocol communication system of the present invention. The HCM3000 system implements the ASDU format specifications defined by IEC60870-5-103 and DL/T667-. Each IEC60870-5-103 communication client corresponds to an IEC60870-5-103 information structure, and all link data, application data and other information related to IEC60870-5-103 communication are distributed in the information structure. The information body mainly contains the following information: communication configuration information of the IEC60870-5-103 client, such as communication state, IP address and port number; protocol information of the IEC60870-5-103 client, such as function type and device address; the server monitors, receives and sends the task ID, receives and sends socket information, and monitors state information of an IEC60870-5-103 protocol link layer; receiving a message sending pointer and length; enabling information of various functions, such as periodic enabling, mutation enabling, total recall enabling, and the like; pointer information of a sending data buffer area with 3 priorities; periodically applying a timing counter and timeout information of the ASDU; address information of each application data such as analog quantity, state quantity, fixed value, soft pressure plate and the like of periodic data configured according to sectors; and fault recording data information.
According to the IEC60870-5-103 information body data information, the application program of the high-voltage direct-current power transmission protocol communication system applies for a corresponding information structure body through the SCI function block, and initializes related elements in the information body according to the configuration of the state quantity interface function block SBNI, the analog quantity interface function block SAI, the fixed value uploading and receiving interface function block SPI and the SOE interface function block SSI. The whole communication protocol program integrates data by the information body to complete the whole communication function. The processing mechanism of the dual-network communication software of the protocol communication system for high-voltage direct-current transmission is shown in fig. 3. In operation, both communication links LAN1 and LAN2 have receive and transmit conditions. When a task of receiving data exists, the data is stored into a received data linked list, a main processing function block SMP of the IEC60870-5-103 protocol communication system analyzes the received data according to the received data by frames, and a specific flow is shown in FIG. 4.
In the HCM3000 system, the IEC60870-5-103 protocol communication system of the present invention is prioritized when processing transmission data, and generally follows the following priority order:
1. priority H: protecting action information, sequence events, and mutation uploading data;
2. priority M: responses to general data, such as summons, queries, cycles;
3. priority L: and transmitting fault recorded broadcast data.
According to different priority orders, different data transmission FIFOs are applied in the program, and the priority orders are as follows:
sending U, S messages by using pSentListUS, wherein the priority is highest;
pSentListL1, sending the priority H data described above;
pSentListL2, sending the priority M data;
pSentListL2, sending the priority L data described above.
The data transmission principle is as follows: the data with high priority is sent with priority, the data with low priority is sent later, and the U, S messages with link control have higher priority than the application data. The specific flow is shown in fig. 5.
For state quantity and analog quantity information in an HCM3000 system, the existing data transmission only needs to introduce an entry address of the data in an application layer program into a data access address of a related function block of IEC60870-5-103 protocol communication service, and configure related sector number and information sequence number information, so that the data transmission can be completed. For the SOE information in the HCM3000 system, a certain conversion work needs to be carried out, and the SOE format in the HCM3000 system and the IEC60870-5-103 specification is shown in the table 1 and the table 2.
TABLE 1
TABLE 2
The HCM3000 system itself has a complete sequential event logging system, including hardware events generated by the instrumentation unit and software events generated by the control protection system. The hardware event is realized by the measurement and control device units, the hardware event is input by scanning once every 1ms time period, and the acquired information is transmitted to the control protection system by the units through a field bus. The state events of the application software are time stamped and information recorded in the control protection system.
Messages transmitted by IEC60870-5-103 protocol in HCM3000 are pre-stored in FMR functional blocks, SOE of HCM3000 system needs to be converted into ASDUs in IEC60870-5-103 communication protocol standard format, the related conversion work is completed by functional block SCS2, the converted messages conforming to IEC60870-5-103 protocol ASDU _1 format are stored in 2 IEC60870-5-103 message buffer SSM, and the size of SSM is configurable. When the protection program is controlled, only the SOE FIFO address for conveying IEC60870-5-103 communication protocols needs to be led into the inlet address of the SCS2 functional block, and the conversion work is completed by the SOE FIFO address. After the messages are stored in the SSM buffer area, each IEC60870-5-103 client side reads one message from each SSM through the SFRB respectively, then inserts the message into the corresponding message sending buffer area through SSI, and transmits the message to the two protection information substations through LAN1 and LAN2, the specific flow is shown in FIG. 6, and the system operation and debugging information can be monitored on line.
Since the IEC60870-5-103 specification has no specific message acknowledgement mechanism, the present invention uses the response acknowledgement counter of the specification itself to prevent the loss of messages, including the following three constraints to guarantee the loss and wrong sending of messages:
the SFRB.PRQ is connected to SMP.SOK, the SOK is changed from 0 to 1 to indicate that the previous frame of message is received (the response counter is equal to the sending counter), so that the next frame of message can be sent, if the SOK is 0, the link layer is incorrect, the message stops sending, is reserved in a buffer area, and waits for the restart sending to be replied;
if the SOK is true (no change from 0 to 1 exists), the interaction of I messages is not generated for a long time, but a message is sent in a buffer area, the SOE can be sent through timeout configured by TIM, namely, the message is actively sent after a period of time as long as a link layer is correct and the message is sent, and the message is prevented from being detained in an SSM buffer area;
and 3. the SFRB.CRQ is connected to the SMP.SL, the SL represents communication establishment connection, if a frame of message is already sent to the SSI in the communication process, but no response is received due to communication disconnection, the message which is not responded currently is retransmitted once after the next link reconnection (SMP.SL is changed from 0 to 1).
Therefore, the protocol communication system for high-voltage direct-current power transmission adopts a network transmission protocol combining a standard IEC60870-5-103 protocol and a TCP/IP protocol, adopts double Ethernet interfaces on the aspect of hardware design, and realizes information interaction between a high-voltage direct-current power transmission control protection system and two protection information substations; the software design separates the application program from the bottom layer communication processing program, the highly packaged bottom layer communication processing module and the user CFC module are fused to realize the communication program design of the protection device, the communication service function can be freely configured through the functional block, the program modification reliability and the working efficiency are improved, and the maintenance cost is low. The method can be widely applied to conventional and extra-high voltage direct current transmission projects, and the safe and reliable data interaction function of the control protection system and the information protection substation is realized.
Claims (6)
1. A high-voltage direct-current transmission protocol communication system is characterized by being arranged between a high-voltage direct-current transmission control protection system and each protection information substation and comprising a runtime system, a protocol data initialization module, a network communication driving module, a protocol communication main processing module and an application layer data interface module, wherein the runtime system is used for analyzing and executing graphical programming tool codes, managing and scheduling tasks, the protocol data initialization module is used for initializing protocol information body data and providing initialization service for data in the protocol communication main processing module and the application layer data interface module, the network communication driving module is used for configuring communication board card information and providing hardware support for the application layer data interface module, and the protocol communication main processing module is used for periodically calling a communication main processing program, the application layer data interface module is used for importing data required to be transmitted or received by a user to complete interface work of the application data and the protocol processing program part of the user.
2. The protocol communication system for high-voltage direct-current transmission according to claim 1, wherein the protocol communication main processing module realizes communication between the high-voltage direct-current transmission control protection system and the protection information substation by adopting two mutually standby links.
3. The system according to claim 1, further comprising a messaging buffer, wherein said application layer data interface module sends information to said protection information substation via said messaging buffer.
4. The system according to claim 3, wherein said message transmission buffers transmit messages to said protection information substations in a priority order.
5. The system according to claim 4, wherein the priority order is: the priority of protection action information, sequence events and mutation uploading data is higher than that of general calling, inquiry and periodic data, and the priority of the general calling, inquiry and periodic data is higher than that of fault recording and broadcasting data.
6. The reduced communication system for hvdc transmission according to any of claims 1-5, wherein said reduced communication system is designed for communication programming using the IEC61131 graphical design language.
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