CN106571979A - Link detection method for process-level switch of intelligent substation and switch - Google Patents

Abstract

The invention discloses a link detection method for a process layer switch of an intelligent substation and the switch. The method first reads and stores configuration network port and link related information; then receives an Ethernet message sent by a merging unit or an intelligent terminal, and performs CRC Checksum and data length check: If the checksum is incorrect, it will be discarded directly; otherwise, the Ethernet packet will be classified to determine whether it is an SV packet or a GOOSE packet. If the Ethernet message is parsed as an SV message or a GOOSE message, check the frame format of the SV or GOOSE message according to the definition of the corresponding standard message frame format. If the verification is wrong, an alarm will be issued. The present invention detects the link state of the process layer in a layer-by-layer progressive manner to prevent confusion and errors in the link state and data transmission, thereby ensuring the reliable operation of the process layer equipment.

Description

Link detection method and switch for process layer switch in smart substation

technical field

The invention relates to a link detection method of an intelligent substation process layer switch and the switch, belonging to the technical field of power system automation.

Background technique

With the large-scale promotion of smart substations in China, the number of application of process layer switches is increasing, and the industrial Ethernet switches that meet the requirements of the IEC61850 standard are becoming more and more important in substations, and have become indispensable for the safe and stable operation of substations. missing important component. The smart substation uses switches at the process layer to realize the information interconnection of protection devices, measurement and control devices, merging units, and intelligent terminals. Therefore, the process layer switch is the key link for reliable protection and correct delivery of remote control commands.

At present, in the smart substation, the link state monitoring equipment is partially configured in the whole station to capture the Ethernet data sent by the process layer, and then detect and correct the data frame, but there is a lag in this processing method. Problems cannot be discovered in real time and dealt with in a timely manner. Moreover, most of the switches in the process layer adopt the store-and-forward working mode. After the Ethernet data frame is completely received, the CRC check is performed, and then a series of processing such as error correction is performed on the data frame before the data frame is forwarded. However, errors may still occur in messages after only CRC checks are used. If they are directly forwarded without processing, link status, data transmission confusion, and errors may occur, so that the reliable operation of process layer devices cannot be guaranteed.

Contents of the invention

The object of the present invention is to provide a link detection method and switch for a process layer switch in an intelligent substation, so as to solve the problems of data transmission confusion and errors in the process layer switch link.

In order to solve the above-mentioned technical problems, the present invention provides a link detection method for a process layer switch in a smart substation, including four method schemes:

Method scheme one includes the following steps:

1) Read and store configuration network port and link related information, configure network port and link related information including the corresponding relationship between nodes and ports;

2) Receive the Ethernet message sent by the merging unit or the intelligent terminal, and perform CRC check and data length check: if the CRC check and data length check are wrong, discard it directly; otherwise, classify the Ethernet message and judge Whether it is an SV message or a GOOSE message;

3) If the Ethernet message is parsed as an SV message or a GOOSE message, check the frame format of the SV or GOOSE message according to the corresponding standard message frame format definition:

If the verification is wrong, an alarm will be issued; otherwise, the node validity verification will be performed:

Compare the corresponding relationship information between nodes and ports in the parsed Ethernet message with the stored information about the corresponding relationship between nodes and ports, and if they are inconsistent, an alarm will be issued.

Method scheme two, on the basis of method scheme one, the configuration network port and link related information also includes node attribute information:

SV link configuration information includes link destination MAC address, link SVID, link VLAN number, link channel number and link configuration version CONFREV;

GOOSE link configuration information includes link destination MAC address, link control block reference information GOCBREF, link data set information DATASET, link identifier GOID, link channel number and link configuration version information CONFREV.

Method scheme three, on the basis of method scheme two, after the node validity verification is correct, it also includes the step of model consistency verification: compare the node attribute information in the parsed Ethernet message with the stored node attribute information The information is compared, and if inconsistent, an alarm will be issued.

Method scheme four, on the basis of method scheme one, the information about the corresponding relationship between the node and the port is the unique identification mark APPID of the link in the Ethernet message.

The present invention also provides a switch, including four switch solutions:

Switch solution one, the switch includes a processor, an interface for receiving the configuration network port and link-related information sent by the configuration machine, and an interface for receiving the Ethernet message sent by the merging unit and the intelligent terminal; wherein, the configuration network Port and link-related information includes the correspondence between nodes and ports;

The processor is used to perform CRC check and data length check after receiving the Ethernet message sent by the merging unit or the intelligent terminal: if the check is wrong, it will be discarded directly; otherwise, the Ethernet message will be classified to determine whether it is SV message or GOOSE message:

If the Ethernet message is parsed as an SV message or a GOOSE message, check the frame format of the SV or GOOSE message according to the definition of the corresponding standard message frame format. test:

Compare the corresponding relationship information between nodes and ports in the parsed Ethernet message with the stored information about the corresponding relationship between nodes and ports, and if they are inconsistent, an alarm will be issued.

Switch scheme two, on the basis of switch scheme one, the configuration network port and link related information also includes node attribute information:

SV link configuration information includes link destination MAC address, link SVID, link VLAN number, link channel number and link configuration version CONFREV;

GOOSE link configuration information includes link destination MAC address, link control block reference information GOCBREF, link data set information DATASET, link identifier GOID, link channel number and link configuration version information CONFREV.

Switch scheme three, on the basis of switch scheme two, the processor is also used to check the model consistency after the node validity check is correct: compare the node attribute information in the parsed Ethernet message with the stored node attribute information for comparison, if inconsistent, an alarm will be issued.

In the fourth solution of the switch, on the basis of the first solution of the switch, the information of the corresponding relationship between the node and the port is the unique identification mark APPID of the link in the Ethernet message.

The beneficial effects of the present invention are: the present invention checks the frame format of the Ethernet message on the basis of the CRC check and the data length check; Network port and link-related information, node validity verification and model consistency verification are performed sequentially, and the link status of the process layer is detected in a progressive manner to prevent confusion and errors in link status and data transmission In order to ensure the reliable operation of the process layer equipment.

Description of drawings

Fig. 1 is the flow chart of the link detection method of the intelligent substation process layer switch of the present invention;

Fig. 2 is a diagram of the relationship between the switch and the network of the present invention.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings.

The intelligent substation process layer link detection method of the present invention comprises the following steps:

1. The configuration machine reads the configuration information of the whole station system, according to the configuration information of the whole station system, selects and configures the network port and link related information according to the needs, generates a file, the file format is customized as PCFG, and sends the file to switch. The switch reads and stores this file.

Among them, the configuration network port and link related information include:

1) Correspondence between nodes and ports: APPID, the unique identification mark of the link in the Ethernet message.

2) Node attribute information:

SV link configuration information includes link destination MAC address, link SVID, link VLAN number, link channel number and link configuration version CONFREV;

GOOSE link configuration information includes link destination MAC address, link control block reference information GOCBREF, link data set information DATASET, link identifier GOID, link channel number and link configuration version information CONFREV.

2. After the process layer switch receives the Ethernet message sent by the merging unit or the intelligent terminal, it performs CRC check and data length check: if the CRC check and data length check are wrong, the message that fails the check will be Discard it directly; perform frame format verification on Ethernet packets that have been verified correctly.

3. Frame format verification: First, link identification is realized by analyzing the message type. If the message type is 0x88BA, it is an SV link message. If the message type is 0x88B8, it is a GOOSE link message. Then, according to the corresponding The standard message frame format is defined to check the frame format of SV or GOOSE messages; if the frame format is wrong, an alarm will be issued, and the alarm information will be output to the log message.

4. Discriminate the message as SV link or GOOSE link, and continue to analyze the link unique identification mark APPID in the message header to verify the validity of the node: judge the switch according to the stored configuration network port and link related information Whether the link unique identifier APPID received by each service port of the service port is consistent with the stored configuration network port and link-related information, if there is an inconsistency, the link is an illegal link, and the corresponding node is an illegal node. If it is an illegal node, no further verification will be performed, and the alarm information of the illegal node will be output directly to the log file, and the link detection will be exited. In addition, if a node is defined in the configuration file and the switch port does not receive any information from the node, an alarm message will also be output. If the link unique identifier APPID is consistent with the stored information, then the corresponding SV or GOOSE model consistency check is performed.

5. Model consistency verification: compare the node attribute information in the parsed Ethernet message with the node attribute information in the stored file, and if they are inconsistent, an alarm will be issued. Among them, any inconsistent attribute information is called model inconsistency. If there is model inconsistency information, an alarm will be issued, and the alarm information will be output to the log file.

All the above test and verification results can be viewed by downloading logs from the configuration machine.

In this embodiment, the node legitimacy is verified by judging whether the link unique identifier APPID in the Ethernet message is consistent with the stored information. As other implementation manners, other information may be used to check the validity of the node to determine whether the corresponding relationship between the node and the port is correct.

In this embodiment, when performing model consistency verification, the node attribute information parsed from the Ethernet message is compared with the stored information, wherein the SV link node attribute configuration information includes link destination MAC address, link SVID, link VLAN number, link channel number, link configuration version CONFREV; GOOSE link node attribute configuration information includes link destination MAC address, link control block reference information GOCBREF, link data set information DATASET, link identification GOID, number of link channels, link configuration version information CONFREV. As other implementation manners, the above-mentioned node attribute information may be properly screened according to the actual situation, and part of the node attribute information may be deleted or added, and then the model consistency check may be performed.

In addition, the present invention also provides a switch. As shown in FIG. 2, the switch includes a processor, an interface for receiving configuration network ports and link-related information sent by the configuration machine, and an interface for receiving the merging unit and the Ethernet network sent by the intelligent terminal. The interface of the network message; among them, the configuration network port and link related information include the corresponding relationship between the node and the port; the processor is used to perform CRC check and data length calibration after receiving the Ethernet message sent by the merging unit or the intelligent terminal. Check: if the verification is wrong, discard it directly; otherwise, classify the Ethernet packet: if the Ethernet packet is parsed as an SV packet or a GOOSE packet, the SV or GOOSE packet will be processed according to the corresponding standard packet frame format definition If the verification is wrong, an alarm will be issued; otherwise, the node validity verification will be performed: compare the corresponding relationship information between nodes and ports in the parsed Ethernet message with the stored information about the corresponding relationship between nodes and ports, and if they are inconsistent , then an alarm will be issued. The protection device and the test device exchange information with the merging unit and the intelligent terminal through the switch.

Since the function realized by the switch is the above-mentioned link detection method for the process layer switch of the smart substation, it will not be described again.

Claims (8)

1. a kind of transformer station process layer switch chain circuit detecting method, it is characterised in that comprise the steps：

1) read and storage configuration network interface and link related information, configuration network interface and link related information include node and port pair Should be related to；

2) the ether network packet that combining unit or intelligent terminal send is received, CRC check and data length check is carried out：If CRC check and data length check mistake, then directly abandon；Otherwise ether network packet is classified, determines whether that SV is reported Text or GOOSE message；

3) if Ethernet packet parsing is SV messages or GOOSE message, SV is carried out according to the definition of corresponding standard message frame format Or the frame format verification of GOOSE message：

If check errors, alert；Node legitimacy verification is carried out otherwise：

By the ether network packet interior joint of parsing and port correspondence relationship information and the node and port correspondence relationship information of storage Compare, if inconsistent, alert.

2. transformer station process layer switch chain circuit detecting method according to claim 1, it is characterised in that the net Mouth and link related information also include node attribute information：

SV link configuration informations include link target MAC (Media Access Control) address, link SVID, link VLAN numberings, link channel number and link Configuration version CONFREV；

GOOSE link configuration informations include link target MAC (Media Access Control) address, link control block reference information GOCBREF, link data collection Information DATASET, link identification GOID, link channel number and link configuration version information CONFREV.

3. transformer station process layer switch chain circuit detecting method according to claim 2, it is characterised in that carrying out After node legitimacy verification is correct, also including the step of carrying out model consistency and verify：By the section in the ether network packet of parsing Point attribute information is made comparisons with the node attribute information of storage, if inconsistent, is alerted.

4. transformer station process layer switch chain circuit detecting method according to claim 1, it is characterised in that the section Point and the link unique identification mark APPID that port correspondence relationship information is in ether network packet.

5. a kind of switch, it is characterised in that the switch includes processor, the configuration network interface for receiving configuration machine transmission Interface with the interface of link related information and for receiving combining unit, the ether network packet that intelligent terminal sends；Wherein, match somebody with somebody Putting network interface and link related information includes node and port corresponding relation；

Processor is for, after the ether network packet that combining unit or intelligent terminal send is received, carrying out CRC check sum According to length check：If check errors, directly abandon；Otherwise ether network packet is classified, determine whether SV messages or GOOSE message：

If Ethernet packet parsing is SV messages or GOOSE message, according to the definition of corresponding standard message frame format carry out SV or The frame format verification of person's GOOSE message, if check errors, alerts；Node legitimacy verification is carried out otherwise：

By the ether network packet interior joint of parsing and port correspondence relationship information and the node and port correspondence relationship information of storage Compare, if inconsistent, alert.

6. switch according to claim 5, it is characterised in that the configuration network interface and link related information also include section Point attribute information：

SV link configuration informations include link target MAC (Media Access Control) address, link SVID, link VLAN numberings, link channel number and link Configuration version CONFREV；

GOOSE link configuration informations include link target MAC (Media Access Control) address, link control block reference information GOCBREF, link data collection Information DATASET, link identification GOID, link channel number and link configuration version information CONFREV.

7. switch according to claim 6, it is characterised in that processor is additionally operable to just verify carrying out node legitimacy After really, model consistency verification is carried out：Nodal community of the node attribute information in the ether network packet of parsing with storage is believed Breath is made comparisons, if inconsistent, alerts.

8. switch according to claim 5, it is characterised in that the node is Ethernet with port correspondence relationship information Link unique identification mark APPID in message.