GOOSE virtual secondary circuit patterning method of intelligent substation

[0021] The smart substation GOOSE virtual secondary circuit graphical method is based on the SCD file, and the GOOSE information with a large number and complex connection relationship in the file is displayed in a graphic way according to the concept of the traditional relay protection secondary circuit. GOOSE's input and output information establishes a virtual connection diagram, which has enough optical interfaces to access the GOOSE information of the A and B networks of the high, medium and low voltage levels of the substation at one time, and the A of each voltage level , The physical isolation of the GOOSE optical interface between the B networks does not affect each other. The SCD file is mainly composed of Header, Substation, Communication, IED and DataTypeTemplates. Each node is organized in a tree-like hierarchical structure, such as figure 1 As shown, the first part Header contains SCD file identification information, file version information, configuration tool information and file modification history information; the second part Substation describes the functional structure of the substation, identifying primary equipment and their electrical connection relationship; The three parts of Communication describe the address information of the SV control block and GOOSE control block of each IED. The Address node under the SMV node is configured with the APPID, MAC, VLAN-ID and VLAN priority of the SV control block. The relevant parameters of the GOOSE control block are in It is configured in the Address node under the GSE node. In addition, the GSE node is also configured with the heartbeat time MaxTime and the minimum retransmission time MinTime for sending GOOSE packets, such as figure 2 The fourth part of IED describes the specific content of each intelligent electronic device and the release and subscription information of SV and GOOSE, such as image 3 shown; the release of SV in the fourth part of the IED is realized by the SV control block SampledValueControl, the name in the SV control block is the name of the control block, the datSet attribute specifies the data set associated with this control block, smvID is the global ID of the control block, nofASDU Defines the number of ASDUs in the message. Each attribute of SmvOpts is Boolean, specifying whether the corresponding item should appear in the message, such as Figure 4 The release of GOOSE in the fourth part of the IED is realized through the GOOSE control block GSEControl. The attributes contained in the GSEControl node include name, datSet, confRef, type and appID, where name is the name of the control block, and the datSet attribute specifies the association with this control block. The data set, appID is the global ID of the control block; the subscription of SV and GOOSE in the fourth part of the IED is defined under the Inputs node, the Inputs node consists of multiple external reference entries ExtRef, each external reference entry specifies the internal input The address intAddr of the virtual terminal and the address of the external output virtual terminal, according to these information, the data object DO or even the specific data attribute DA corresponding to the internal and external virtual terminals can be found, such as Figure 5 shown; Image 6It is the content structure diagram of the data set DataSet in the fourth part of the IED. The name attribute in the base is its identifier. The attribute datSet of the SV/GOOSE control block mentioned above specifies the name of the DataSet. By comparing these two strings, The data set associated with the SV/GOOSE control block can be found. The desc attribute gives the description information of the data set. The DataSet node consists of multiple sub-nodes FCDA. Comparing FCDA and the above ExtRef, we can see that they have some similar attributes ( ldInst, prefix, lnClass, etc.), the difference is that these attributes in ExtRef specify the data path of an external IED, while these attributes of FCDA specify the data path of this IED; the fifth part, DataTypeTemplates, defines the logical node type LNodeType , the LN0/LN node in each IED is an instance of a certain LNodeType. By comparing the lnType attribute of the former and the id attribute of the LNodeType, it can be determined that each LN0/LN is instantiated by that LNodeType, LN0/ The DOI under the LN node is the instantiated object of the DO with the same name under the corresponding LNodeType, such as Figure 7 As shown; the data object type DOType and the data attribute type DAType, each DO under the LNodeType is derived from a DOType, and the DAI under the DOI node is the instantiated object of a DA under the corresponding DOType. There is a bType attribute, which specifies the basic data type of the DA. The DA whose bType is Struct is a structured DA, and its specific structure is defined by the corresponding DAType; the DA whose bType is Enum is an enumeration type, and the specific content includes The corresponding EnumType definition, such as Figure 8 shown.

[0022] The association of several kinds of information in the SCD file:

[0023] 1. Three parts of SV/GOOSE configuration: The complete configuration of an SV/GOOSE message in the SCD file includes three parts: control block parameters (SampledValueControl/GSEControl), communication parameters (SMV/GSE), data set configuration ( DataSet). like Figure 9 The association between the three parts is shown: find the SMV/GSE that matches the control block by comparing the name of the IED, the name of the access point, the instance name inst of the LD and the name of the control block; by comparing the datSet of the control block The name of the property and dataset DataSet finds a DataSet that matches the control block.

[0024] 2. Establishment of virtual terminal connection: The Inputs node in the SCD file describes the reference (subscription) of each IED to external signals (SV and GOOSE). The following takes the reference of GOOSE as an example to describe the process of establishing a virtual terminal connection.

[0025]

[0026]

[0027] Take an external reference under an inputs node as an example:

[0028]

[0029]

[0030] According to the iedName and ldInst specified by the reference, the IED and the logical device LDevice where the external signal is located can be found, and all DataSet entries under the LDevice can be traversed. The matching data set entries can be found by comparing ldInst, prefix, lnClass, lnInst, doName and daName. The association of datasets with control blocks has been described above. So far, the number of data set entries of which GOOSE control block of which IED is subscribed by the external reference entry is found, and the virtual terminal connection is thus established.

[0031] The following is a brief description of the method steps from the beginning of analyzing the SCD to the final drawing of the virtual terminal connection diagram:

[0032] The first step: parsing the SCD file, based on the MMS-lite software package, parsing the SCD file. MMS-lite basically generates a large tree structure according to the original structure of the SCD file, which is convenient for the program to quickly search and traverse the SCD file.

[0033] Step 2: Traverse the tree structure, construct the IED linked list, traverse the tree structure generated in the first step, construct the IED linked list, and construct the SV sending list, GOOSE sending list, and data input external reference list for each IED; SV/GOOSE The sending list includes three parts: the parameters of each SV/GOOSE control block, address information, and the data set list. For establishing virtual terminal connections, the most important thing is the data set list. Here, a reference to each data set entry is required. Address; each external reference entry of the data input consists of two parts: the reference address of the internal receiving terminal and the reference address of the external sending terminal.

[0034] Step 3: Traverse the data input external reference list of each IED, establish the connection relationship between virtual terminals, and traverse the external reference list of each IED data input. According to the address of the external sending terminal in each external reference entry, we can find the specific The sender IED further compares the address with the data set entry reference address of each SV/GOOSE control block of the sender IED, and can find out which SV/GOOSE control block the data set of which SV/GOOSE control block is to be referenced by this external reference entry. entry, also find the external send terminal. The information of the external sending terminal is recorded under the external reference entry, and the external reference entry is also recorded under the corresponding SV/GOOSE data set entry, which is convenient for drawing the virtual terminal connection diagram later. Perform the above operations on each external reference entry of all IEDs, and then the virtual terminal connection relationship of the whole station can be established.

[0035] Step 4: Traverse the IED linked list again, create a drawing auxiliary variable for each IED, and establish an external associated IED linked list for each IED according to the virtual terminal connection established in the previous step. The linked list contains all data input to this IED. The IED of the output relationship, each item of the external associated IED linked list contains four parts: SV sending information list: the SV control block serial number and data set entry serial number sent by the external IED to this IED; SV receiving information list: this IED sends to the external SV control block serial number and data set entry serial number of IED; GOOSE sending information list: GOOSE control block serial number and data set entry serial number sent by external IED to this IED; GOOSE receiving information list: GOOSE control block serial number sent by this IED to external IED and the dataset entry sequence number.

[0036] The fifth step: draw the IED virtual terminal connection diagram, and draw the IED virtual terminal connection diagram according to the auxiliary variables established in the fourth step: the current IED block diagram is drawn in the center of the view, and each external IED block diagram is drawn on both sides; In the block diagram, draw the block diagram of each other's SV and GOOSE control blocks sent by each IED, and draw the connection line, so as to draw a schematic diagram of the dashed connection between the current IED and the external IED.