CN103647717A - Message accurate recognition-based substation communication network deterministic path switching method - Google Patents
Message accurate recognition-based substation communication network deterministic path switching method Download PDFInfo
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Abstract
The invention discloses a message accurate recognition-based substation communication network deterministic path switching method. The method comprises the following steps that: an IED at first needs to parse the APPID, SRCMAC and GOOSEID ref/smvID of GOOSE and SV messages; and then HASH computation is performed on the GOOSEID ref/smvID so as to form an ASH combination key; an ASH forwarding table is searched, when contents that completely conform to the APPID, SRCMAC and HASH (GOOSEID ref/smvID) of the massages exist in the ASH forwarding table, the massages directly go to corresponding ports in the ASH forwarding table, and when no corresponding information or information that is not completely corresponding to the APPID, SRCMAC and HASH of the messages exists in the ASH forwarding table, the messages are discarded; and finally, the messages enter a queue at the ports through cache mapping, and queue up for transmission, and at the same time, equipment continues to receive GOOSE and SV messages. With the message accurate recognition-based substation communication network deterministic path switching method of the invention, problem of conflicts in message recognition can be avoided; deterministic path forwarding of specified massages can be realized; and problems of network congestion and equipment misoperation caused by a multicast switching mode can be effectively alleviated.
Description
Technical field
The present invention relates to the technical field of substation communication network message transmissions, refer in particular to a kind of substation communication network certainty path exchanging method of accurately identifying based on message.
Background technology
The real-time reliability of message transmissions is to evaluate the important indicator of substation automation system communication network performance.In message switching procedure, realizing the identification of the controlled and error message of message transmitting procedure is the effective means that promotes the real-time reliability of communication network.The main message transmitting in substation communication network has GOOSE, SV and MMS message three classes, and wherein GOOSE and SV message adopt the mode of broadcast to transmit in network.Due to switching technology that at present substation communication network adopts effectively identifying information stream type and control information flow transmission path; cause equipment component to receive unwanted GOOSE and SV message; when bringing unnecessary flow load to communication network; also in network, produced the parasitic loop of message transmissions, to relay protection device, brought because receiving and do not subscribe to the hidden danger that malfunction occurs message.
As shown in Figure 6, be current substation communication network switching technology framework, its operation principle is: when packet arrives switch ports themselves, first by receiver, whole section of message received; Then, by datagram parsing module, data content is resolved, in this process, switch only can obtain the base attributes such as data M AC address, priority level, then, corresponding mac address table, packet enters queue relevant position by buffer memory mapping and queues up, and when packet arrives team, by datagram package module, to its encapsulation and via transmitter, is sent and leaves switch.The exchange scheme that substation communication network adopts is at present by forming mac address table and carrying out the forwarding of message according to this table, and this pass-through mode is not also suitable for GOOSE and SV message.It is mainly the transmission means because of regulation GOOSE in standard and SV message repeating employing multicast, the mode of this multicast can cause the conflict of network to increase, some should not receive that the equipment of message received message, to network, bring unnecessary flow burden, although substation communication network switching technology adopts vlan technology to divide broadcast domain at present, reduce to a certain extent the flow burden that multicast brings, but still cannot thoroughly avoid problem.For addressing this problem, the most basic is that the mode that changes this inquiry mac address table E-Packets.
In addition, also have at present and researched and proposed a kind of exchanged form of transmitting by SCD document analysis acquisition message APPID.By obtaining message APPID, search the IED equipment that receives this message, definite path of realizing message forwards, thereby solve the flow burden and the part IED equipment that bring due to multicast message in above-mentioned substation communication network switching technology, receives the problems such as unnecessary message misoperation.APPID transmits to form to depend on and resolves SCD file, SCD file is the file for intelligent substation configuration of IEC61850 definition, has contained the paragraph content such as the whole intelligent electronic devices of description intelligent substation (IED), communication configuration and transformer station's topological structure.Parsing by SCD file can obtain the full spectrum informations such as corresponding relation that comprise whole IED electronic device names, port title, the related Ge of port road GOOSE/SV message, APPID and port.By SCD document analysis, can connect topology and message subscription/publication and device port corresponding relation by equipment, further, by switch packet parsing and port learning functionality, integrate related content acquisition APPID in message APPID and message subscription device port corresponding relation and mac address table and transmit.The groundwork flow process of the substation communication network switching technology of transmitting based on APPID is: first by SCD document analysis and switch ports themselves study, form APPID and transmit; Secondly, when switch receives message, by packet parsing module, obtain message APPID; Then, search APPID and transmit, if there is the information conforming to this message, message is directly gone to the port of transmitting middle correspondence, otherwise abandons this message; Finally, by packet encapsulation module package message and by transmitter, message is delivered to next node, switch continues to receive message.Although, adopt simple APPID identification GOOSE/SV message technology, in principle, can realize GOOSE/SV message and distinguish.But in actual applications, may occur due to error configurations, the reasons such as stand-by heat and testing apparatus access cause different GOOSE or SV message to have the situation of identical APPID, cause GOOSE/SV message to distinguish or forward mistake.
Therefore, eventually the above, improve the exchange scheme of SV message, GOOSE message in current substation communication network switching technology, adopt and a kind ofly can accurately identify message and realize the exchange scheme that message determines that path forwards, can largely improve the real-time reliability of substation communication network.
Summary of the invention
The object of the invention is to solve flow load and the equipment misoperation that in current substation communication network switching technology, information broadcasting brings, and utilize the APPID collision problem of APPID for occurring in major key identification GOOSE/SV stream technology, a kind of substation communication network certainty path exchanging method of accurately identifying based on message is provided, the ASH Macintosh that utilizes APPID/SRCMAC/HASH (GOOSEID ref/smvID) to form is realized GOOSE, SV message is accurately identified, and realize message and still message can be passed to the equipment that should receive this message in employing multicast address situation, and the equipment that should not accept this message can not receive this message, realize the communication of the definite link that meets message subscribing relationship.
For achieving the above object, technical scheme provided by the present invention is: the substation communication network certainty path exchanging method of accurately identifying based on message, comprises the following steps:
1) switch is resolved SCD file, forms respectively that IED sends message allocation list and IED receives message allocation list, and take the ASH that ASH Macintosh is major key and transmit by sending test packet, forming;
2) switch receives GOOSE, SV message;
3) resolve application identities APPID, SRCMAC address, the GOOSEID ref/smvID content in GOOSE, SV message, and GOOSEID ref/smvID is carried out to Hash operation HASH, form the ASH Macintosh described in step 1), obtain ASH major key information;
4) search ASH and transmit the further confirmation of the civilian port do of docking receiving, if there is the forwarding information that meets this ASH Macintosh, message is gone to corresponding ports, otherwise abandons message process ends;
5) message is shone upon and is entered queue and wait in line to send by buffer memory at port, and equipment continues to receive GOOSE, SV message, repeating step 2 simultaneously) to 5).
In step 1), the forming process that described ASH transmits is as follows: first, IED equipment forms corresponding IED by SCD document analysis and sends message allocation list and IED reception message allocation list in switch; Secondly, the content that sends message APPID, device name and port corresponding relation in message allocation list and IED reception message allocation list in conjunction with IED forms corresponding IED equipment end oral thermometer, wherein, described IED equipment end oral thermometer is by APPID, as tie, to have formed the corresponding relation of IED equipment and each port of switch, and IED reception message allocation list is as tie, to determine the object IED port that message should be gone to by APPID; Finally, in conjunction with IED equipment end oral thermometer and IED, receive message allocation list, and increase two contents of this message SRCMAC, HASH (GOOSEID ref/smvID), form required ASH and transmit.
Described ASH transmit can according to IED equipment end oral thermometer whether add or more fresh content upgrade, its renewal process is as follows: when IED equipment end oral thermometer need to add or more during fresh content, need the application identities APPID of GOOSE, SV message, SRCMAC address, GOOSEID ref/smvID content to resolve, the port numbers src_port that enters switch in conjunction with it, forms corresponding IED equipment end oral thermometer; Secondly, switch obtains the switch ports themselves ori_port before IED title, port title and the renewal in IED device port list item, and according to these contents, IED reception message allocation list is searched; If receiving in message allocation list, IED there is no relevant record, finish whole process, if receiving in message allocation list, IED has relevant record, extract IED title and port title corresponding APPID, SRCMAC, HASH (GOOSEID ref/smvID), and search in ASH transmits according to APPID, SRCMAC, HASH (GOOSEID ref/smvID); If there is not the record that conforms to during ASH transmits, add this and be recorded to during ASH transmits, and upgrade the port numbers of ASH in transmitting, thereby complete the renewal that ASH transmits.
In step 3), adopt APPID parsing module to obtain the APPID of GOOSE, SV message, and transmit the preliminary message source mouth of determining by searching ASH; Then, adopt SRCMAC parsing module and GOOSEID ref/smvID parsing module to obtain SRCMAC address and the GOOSEID ref/smvID content of GOOSE, SV message; Secondly, by HASH module, GOOSEID ref/smvID content is processed.
In step 4), described in meet this ASH Macintosh forwarding information be that ASH transmits middle existence and message APPID, SRCMAC, three contents that conform to completely of HASH (GOOSEID ref/smvID).
Compared with prior art, tool has the following advantages and beneficial effect in the present invention:
1, the ASH Macintosh that utilizes APPID/SRCMAC/HASH (GOOSEID ref/smvID) to form is realized GOOSE, SV message is accurately identified, and realize message and still message can be passed to the equipment that should receive this message in employing multicast address situation, and the equipment that should not accept this message can not receive this message, realize the communication of the definite link that meets message subscribing relationship;
2, avoided the collision problem of message identification, definite path of realizing regulation message forwards, and effectively alleviates network congestion and equipment misoperation problem that multicast exchanged form is brought.
Accompanying drawing explanation
Fig. 1 is the frame structure schematic diagram of GOOSE message of the present invention.
Fig. 2 is the frame structure schematic diagram of SV message of the present invention.
Fig. 3 is message switching schematic flow sheet of the present invention.
Fig. 4 is the composition framework schematic diagram based on ASH Macintosh switching technology of the present invention.
Fig. 5 is that ASH of the present invention transmits renewal schematic flow sheet.
Fig. 6 is current substation communication network switching technology framework schematic diagram.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Shown in Fig. 1 and Fig. 2, the frame structure of GOOSE message and the frame structure of SV message have been shown respectively, as we know from the figure, front 12 bytes of GOOSE, SV message are message destination address and source address, 0x8100,0x88B8 and 0x88BA are ethernet type sign, 0x8100 represents that the field after this field is VLAN(VLAN) sign, 0x88B8 represents that this message is GOOSE message, 0x88BA represents that this message is SV message, APPID is application identities, data are the data message that message carries, variable-length, and CRC is CRC.
The 19th, 20 bytes of GOOSE, SV message are application identities APPID.APPID is visual character string, represents the logical device that GoCB is positioned at, and default value is defined as the ObjectReference of GoCB.The application identities of GOOSE message at 0x0 between 0x3FFF, unique identification Liao Yi road GOOSE; The application identities of SV message at 0x4000 between 0x7FFF, unique sign Liao Yi road sampled value.In practice operation, single use APPID is as GOOSE and SV message identification key, and effectively error differentiating inking device or stand-by heat device send the situation with the identical APPID of existing device.
GOOSE, SV message are message source address since 6 byte content of the 7th byte.Different device has unique and different SRCMAC in order to identify the position of this device in network.
GOOSE sign (GOOSEID ref) is the unique identification within the scope of GOOSE application of electronic report, and GOOSE sign is arranged in GOOSE frame structure variable-length part, and GOOSEID ref comprises logical device title and GOOSE controll block title.ObjecetReference GoCBRef is: LDName/LLN0.GoCBName.GOOSEID ref comprises equipment and controll block information more intuitively than APPID, but because GOOSEID ref field is not fixed length, for realize the application of GOOSEID ref at hardware view, need to use Hash operation that GOOSEID ref is arranged is shorter CHAR.
Sampled value ID (smvID) be sampled value at the unique identification of buffering area, effect is equivalent to GOOSE sign.SmvID has comprised merge cells MU relevant information and logic port information, and this field is non-fixed length also, needs to use Hash operation to be arranged as shorter CHAR.
Hash algorithm (HASH) is a kind of algorithm that random length character string is mapped to less regular length character string, and the value of this smaller length is called cryptographic Hash.Cryptographic Hash is the unique and extremely compact numeric representation form of one piece of data.If former character string changes even a letter, Hash subsequently all will produce different values, find two different inputs that cryptographic Hash is identical, on calculating, be impossible, therefore calling hash algorithm carries out field length processing to GOOSEID ref or smvID, there is higher discrimination and fail safe, the general HASH (GOOSEID ref/smvID) that is expressed as of its result.
Shown in Figure 3, shown GOOSE of the present invention, SV message repeating exchange flow process, its concrete condition is as follows:
1) switch is resolved SCD file, forms respectively that IED sends message allocation list and IED receives message allocation list, and take the ASH that ASH Macintosh is major key and transmit by sending test packet, forming;
2) switch receives GOOSE, SV message;
3) resolve application identities APPID, SRCMAC address, the GOOSEID ref/smvID content in GOOSE, SV message, and GOOSEID ref/smvID is carried out to Hash operation HASH, form the ASH Macintosh described in step 1), obtain ASH major key information;
4) search ASH and transmit the further confirmation of the civilian port do of docking receiving, if there is the forwarding information that meets this ASH Macintosh, be that ASH transmits middle existence and message APPID, SRCMAC, three contents that conform to completely of HASH (GOOSEID ref/smvID), message is gone to corresponding ports, otherwise abandons message process ends;
5) message is shone upon and is entered queue and wait in line to send by buffer memory at port, and equipment continues to receive GOOSE, SV message, repeating step 2 simultaneously) to 5).
Wherein, for forming, take the ASH that ASH is major key and transmit, need switch device port be done to learn forming on the basis that APPID transmit.Specifically, first, IED equipment forms IED as shown in table 1 below by SCD document analysis and sends message allocation list and IED reception message allocation list as shown in table 2 below in switch.
Table 1 IED sends message allocation list
| APPID | iedName | apName | type | cbName | ldInst |
| ? | ? | ? | ? | ? | ? |
Table 2 IED receives message allocation list
| APPID | iedName | apName | type | ldInst |
| ? | ? | ? | ? | ? |
In table 1,2, each list item meaning is as shown in table 3 below.
Table 3
| Field name | Type | Explanation |
| APPID | U16 | Application identities, major key |
| iedName | Character string | IED title |
| apName | Character string | APN |
| type | Character string | Type of message GSE/SMV |
| cbName | Character string | Controll block (Control Block) |
| ldInst | Character string | Logical device node (Logical Device) |
Secondly, in associative list 1 and table 2, the content such as message APPID, device name and port corresponding relation can form IED equipment end oral thermometer as shown in table 4 below.
Table 4 IED equipment end oral thermometer
Described IED equipment end oral thermometer is by APPID, as tie, to have formed the corresponding relation of IED equipment and each port of switch, and described IED reception message allocation list is also to determine as tie the object IED port that message should be gone to by APPID, in conjunction with two tables and increase two contents of this message SRCMAC, HASH (GOOSEID ref/smvID), form ASH as shown in table 5 below and transmit.
Table 5 ASH transmits
Wherein, list item Member is target port, and Member is 32 2 system numbers, and n position is 1, represents to be forwarded to (n+1) port, and n position is 0, represents not to be forwarded to (n+1) port.
The present invention is the accurate identification that realizes GOOSE, SV message, makes full use of the message information that APPID, SRCMAC and GOOSE ref/smvID contain, and is combined into ASH Macintosh, further forms ASH and transmit on APPID retransmission technique basis.
Shown in Figure 4, shown the composition framework that the present invention is based on ASH Macintosh switching technology, this compares with current substation communication network switching technology framework, the switching technology that the present invention proposes adopts APPID parsing module to obtain the APPID of GOOSE, SV message, and transmits the preliminary message source mouth of determining by searching ASH; Then, by SRCMAC parsing module and GOOSEID ref/smvID parsing module, obtain message SRCMAC address and GOOSEID ref/smvID content; Secondly, by HASH module, GOOSEID ref/smvID content is processed, and by ASH, transmitted the civilian port of docking receiving and do further to confirm; Finally the message by checking is sent to corresponding ports, by buffer memory, maps to queue and rank and wait transmission.
In addition, ASH of the present invention transmit can according to IED equipment end oral thermometer whether add or more fresh content upgrade, its renewal process as shown in Figure 5, concrete condition is as follows: when IED equipment end oral thermometer need to add or more during fresh content, need the application identities APPID of GOOSE, SV message, SRCMAC address, GOOSEID ref/smvID content to resolve, the port numbers src_port that enters switch in conjunction with it, forms corresponding IED equipment end oral thermometer, as above shown in table 4; Secondly, switch obtains the switch ports themselves ori_port before IED title (IEDname), port title (AccessPointName) and the renewal in IED device port list item, and according to these contents, IED reception message allocation list is searched; If receiving in message allocation list, IED there is no relevant record, finish whole process, if receiving in message allocation list, IED has relevant record, extract IED title (IEDname) and port title (AccessPointName) corresponding APPID, SRCMAC, HASH (GOOSEID ref/smvID), and search in ASH transmits according to APPID, SRCMAC, HASH (GOOSEID ref/smvID); If there is not the record that conforms to during ASH transmits, add this and be recorded to during ASH transmits, and upgrade the port numbers of ASH in transmitting, thereby complete the renewal that ASH transmits.
In a word, after adopting above scheme, the ASH Macintosh that the present invention utilizes APPID/SRCMAC/HASH (GOOSEID ref/smvID) to form is realized GOOSE, SV message is accurately identified, and realize message and still message can be passed to the equipment that should receive this message in employing multicast address situation, and the equipment that should not accept this message can not receive this message, realize the communication of the definite link that meets message subscribing relationship, this compared to existing technology, the present invention has effectively avoided the collision problem of message identification, definite path of realizing regulation message forwards, and then effectively alleviate network congestion and the equipment misoperation problem that multicast exchanged form is brought, be worthy to be popularized.
The examples of implementation of the above are only the present invention's preferred embodiment, not with this, limit practical range of the present invention, therefore the variation that all shapes according to the present invention, principle are done all should be encompassed in protection scope of the present invention.
Claims (5)
1. the substation communication network certainty path exchanging method of accurately identifying based on message, is characterized in that, comprises the following steps:
1) switch is resolved SCD file, forms respectively that IED sends message allocation list and IED receives message allocation list, and take the ASH that ASH Macintosh is major key and transmit by sending test packet, forming;
2) switch receives GOOSE, SV message;
3) resolve application identities APPID, SRCMAC address, the GOOSEID ref/smvID content in GOOSE, SV message, and GOOSEID ref/smvID is carried out to Hash operation HASH, form the ASH Macintosh described in step 1), obtain ASH major key information;
4) search ASH and transmit the further confirmation of the civilian port do of docking receiving, if there is the forwarding information that meets this ASH Macintosh, message is gone to corresponding ports, otherwise abandons message process ends;
5) message is shone upon and is entered queue and wait in line to send by buffer memory at port, and equipment continues to receive GOOSE, SV message, repeating step 2 simultaneously) to 5).
2. according to claim 1 based on the accurate substation communication network certainty path exchanging method of identifying of message, it is characterized in that, in step 1), the forming process that described ASH transmits is as follows: first, IED equipment forms corresponding IED by SCD document analysis and sends message allocation list and IED reception message allocation list in switch; Secondly, the content that sends message APPID, device name and port corresponding relation in message allocation list and IED reception message allocation list in conjunction with IED forms corresponding IED equipment end oral thermometer, wherein, described IED equipment end oral thermometer is by APPID, as tie, to have formed the corresponding relation of IED equipment and each port of switch, and IED reception message allocation list is as tie, to determine the object IED port that message should be gone to by APPID; Finally, in conjunction with IED equipment end oral thermometer and IED, receive message allocation list, and increase two contents of this message SRCMAC, HASH (GOOSEID ref/smvID), form required ASH and transmit.
3. according to claim 2 based on the accurate substation communication network certainty path exchanging method of identifying of message, it is characterized in that, described ASH transmit can according to IED equipment end oral thermometer whether add or more fresh content upgrade, its renewal process is as follows: when IED equipment end oral thermometer need to add or more during fresh content, need the application identities APPID of GOOSE, SV message, SRCMAC address, GOOSEID ref/smvID content to resolve, the port numbers src_port that enters switch in conjunction with it, forms corresponding IED equipment end oral thermometer; Secondly, switch obtains the switch ports themselves ori_port before IED title, port title and the renewal in IED device port list item, and according to these contents, IED reception message allocation list is searched; If receiving in message allocation list, IED there is no relevant record, finish whole process, if receiving in message allocation list, IED has relevant record, extract IED title and port title corresponding APPID, SRCMAC, HASH (GOOSEID ref/smvID), and search in ASH transmits according to APPID, SRCMAC, HASH (GOOSEID ref/smvID); If there is not the record that conforms to during ASH transmits, add this and be recorded to during ASH transmits, and upgrade the port numbers of ASH in transmitting, thereby complete the renewal that ASH transmits.
4. according to claim 1 based on the accurate substation communication network certainty path exchanging method of identifying of message, it is characterized in that: in step 3), adopt APPID parsing module to obtain the APPID of GOOSE, SV message, and transmit the preliminary message source mouth of determining by searching ASH; Then, adopt SRCMAC parsing module and GOOSEID ref/smvID parsing module to obtain SRCMAC address and the GOOSEID ref/smvID content of GOOSE, SV message; Secondly, by HASH module, GOOSEID ref/smvID content is processed.
5. according to claim 1 based on the accurate substation communication network certainty path exchanging method of identifying of message, it is characterized in that: in step 4), described in meet this ASH Macintosh forwarding information be that ASH transmits middle existence and message APPID, SRCMAC, three contents that conform to completely of HASH (GOOSEID ref/smvID).
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