A method for quickly analyzing secondary device connection relationship from SCD file

Abstract

The application discloses a method for quickly analyzing secondary equipment connection relationship from an SCD file, and comprises the following steps: (1) reading in the SCD file and analyzing Communication data; (2) extracting all IEDs of switch devices; (3) grouping switch devices with connection relationship; (4) extracting all secondary devices; (5) starting to analyze the secondary equipment connection relationship, and if the connection relationship is found, the analysis is ended; if the connection relationship is not found, step (6) is entered to analyze and search for switch devices with connection relationship. Through grouping the switch devices and analyzing the connection relationship between the IED devices and the switch devices, and in combination with the IED device direct connection relationship search, the application can improve the analysis speed of the smart substation secondary equipment internet-of-things connection relationship, eliminate the secondary equipment communication loop defects and improve the equipment operation and maintenance level.

Description

Technical Field

[0001] This invention relates to a method for analyzing the connection relationships of secondary equipment, and more particularly to a method for quickly analyzing the connection relationships of secondary equipment from an SCD file. Background Technology

[0002] Secondary equipment in substations is crucial for ensuring the safe and stable operation of the power grid. In intelligent substations based on the IEC 61850 standard, communication networks and digital signals replace traditional secondary cable circuits and electrical physical signals. The connections between secondary equipment are described using SCL (Substation Configuration Language) and stored in SCD (Substation Configuration Description) files. Substation systems such as network analysis equipment and online monitoring equipment for secondary equipment must analyze and extract the equipment connection relationships from the SCD files to complete related application functions. Existing analysis methods mainly have the following problems:

[0003] 1) Due to the large size of the SCD model, the large number of devices, and the large number of device communication ports, a typical 500kV smart substation may have hundreds of devices, resulting in slow analysis speed.

[0004] 2) In addition to direct fiber optic connections, secondary devices may also exchange information through multiple industrial Ethernet switches, resulting in a complex network topology that increases the difficulty of analysis and reduces efficiency.

[0005] 3) Existing analysis methods typically start with a secondary device and perform radial searches, which is inefficient and results in repeated search paths. Summary of the Invention

[0006] Purpose of the invention: The purpose of this invention is to provide a method for quickly analyzing the connection relationships of secondary devices from SCD files, which is fast and avoids duplicate search paths.

[0007] Technical solution: The rapid analysis method for secondary device connection relationships of the present invention includes the following steps: (1) reading in the SCD file and parsing the Communication data; (2) extracting the IED (Intelligent Electronic Device) of all switch devices; (3) grouping the switches with connection relationships; (4) extracting all secondary device IEDs; (5) starting to analyze the secondary device connection relationships; (6) analyzing and retrieving switches with connection relationships; in step (5), if a connection relationship is found, the analysis ends; if no connection relationship is found, proceed to step (6).

[0008] In step (1), extract the device port and the cable information to which the port belongs.

[0009] In step (2), extract the IEDs of all switch devices from the secondary device list in the SCD file.

[0010] In step (3), the switches are pre-grouped, and switches that are connected to each other are grouped together, and a topology relationship is established for the group.

[0011] In step (4), based on the virtual terminal inputs of the secondary equipment, the devices that have logical connections with the secondary equipment are analyzed.

[0012] In step (5), when analyzing the connection relationship between two secondary devices, first determine whether there is a direct connection between the secondary devices; when there is no direct connection between the two secondary devices, check the switches connected to the secondary devices respectively; if the switches are in the same group, find the connection relationship; if they are not in the same group, there is no connection relationship between the devices.

[0013] In step (6), the switches connected to the two non-switch devices are retrieved respectively. If the relevant switches are in the same group, the connection relationship search is completed; otherwise, there is no physical link between the two non-switch devices.

[0014] Compared with existing technologies, the significant advantages of this invention are as follows: 1. By grouping and analyzing the connection relationship between IED devices and switches, and combining this with the retrieval of direct connection relationships of IED devices, the analysis speed of physical connection relationships of secondary equipment in smart substations can be improved; 2. By analyzing the connection relationship between secondary equipment and comparing it with virtual circuits, it helps to eliminate configuration defects in secondary equipment communication circuits, such as inconsistencies between virtual and real circuits in the SCD file, and improves the level of equipment operation and maintenance; 3. The secondary equipment connection relationship analysis method of this invention can be applied to the correctness verification of SCL models in smart substations, automatic mapping of secondary physical circuits, mapping of virtual and real circuits, and monitoring of secondary circuits. Attached Figure Description

[0015] Figure 1 This is a flowchart of the present invention;

[0016] Figure 2 This is a schematic diagram of the method of the present invention;

[0017] Figure 3 This is an example diagram illustrating the connection configuration of secondary equipment in a substation, as shown in the embodiment. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and an embodiment of the SCL file virtual-real loop consistency verification (a type of model verification).

[0019] like Figure 1 As shown, the SCD file and communication-related descriptions are defined in... <communication>The steps are as follows:

[0020] Step 1: Read in the SCD file, parse the model data, analyze the SubNetwork information under the Communication element, and record the device ports and the cable information to which the ports belong.

[0021] Step 2: Add the switch equipment and secondary equipment (conventional protection, measurement and control, merging units, etc.) from the SCD file.

[0022] Step 3: Based on Cable information (Cables are unique across the entire site, and ports with the same cable are connected together), pre-group the switches, grouping interconnected switches into one group, and establish topology relationships for each group, such as... Figure 2 As shown.

[0023] Step 4: Analyze the virtual loop information between substation intelligent devices from the Inputs elements of the secondary equipment to establish logical connections between the secondary equipment. Based on the Inputs of the virtual terminals of the secondary equipment, identify the device IED2 that has a logical connection with the secondary equipment.

[0024] Step 5: Based on the logical relationships between the secondary devices established in Step 4, search for direct connections between the secondary devices. Check the direct connection between IED1 and IED2. If no direct connection is found, proceed to Step 6.

[0025] Step 6: If no results are found in Step 5, search for the switches connected to the IED and check if the corresponding switches are in the same switch group (established in Step 3).

[0026] Figure 2 In this diagram, IED1 represents secondary equipment, and SWX represents a switch. IED1 and IED2 are connected through switch group 1, while IED1 and IED4 are directly connected. The substation switches are divided into switch group 1 (SW1, SW2, SW3, SW4, SW5) and switch group 2 (SW6, SW7, SW8, SW9, SW10, SW11). Secondary equipment IED1 is connected to switch SW4, IED2 is connected to switch SW3, IED3 is connected to switch SW9, and IED1 and IED4 are directly connected. According to steps 1-6, IED1 and IED3 are not directly connected; and the switches they are connected to (SW4 and SW3) belong to the same switch group (switch group 1). The physical connection relationship between the secondary equipment is: IED1-SW4-SW2-SW1-SW3-IED2.

[0027] According to step 4, it can be analyzed that there is a virtual terminal connection between P_M2201A (220kV main bus differential protection) and M_M2201A (bus merging unit), as shown in Table 1.

[0028] Table 1. Virtual terminal connections between P_M2201A and M_M2201A

[0029]

[0030] according to Figure 3 It can be seen that there is no connection between the secondary devices M_M2201A and P_M2201A, and there is no direct connection between them; P_M2201A is connected to the switch group (SW2201_A1, SW2202_A1, SW2203_A1, SW2204_A1, SW2205_A1), and M_M2201A is connected to the switch SW2206_A1. The two devices are not connected to the same switch group.

[0031] There is only a virtual loop between the two secondary devices without a physical connection, and the virtual and physical loops are inconsistent, generating an alarm. If the switches SW2201_A1 and SW2206_A1 are cascaded; or if P_M2201A is connected to SW2206_A1, then the two secondary devices are connected to the same switch group, and no alarm will be generated.< / communication>

Claims

1. A method for rapidly analyzing the connection relationships of secondary devices from an SCD file, characterized in that, The steps include the following: (1) Read in the SCD file, extract the device port and the Cable information to which the port belongs, and parse the Communication data; (2) Extract the IEDs of all switch devices from the secondary device list in the SCD file; (3) Based on the cable information, the switches are pre-grouped, and the switches that are connected to each other are grouped together, and the topology relationship is established for the group; (4) Analyze the virtual loop information between substation intelligent devices from the Inputs element of the secondary equipment, and establish the logical connection between the secondary equipment; based on the Inputs of the virtual terminals of the secondary equipment, analyze the devices that have logical connections with the secondary equipment. (5) When analyzing the connection relationship between two secondary devices, first determine whether there is a direct connection between the secondary devices; when there is no direct connection between the two secondary devices, check the switches connected to the secondary devices respectively; if the switches are in the same group, find the connection relationship; if they are not in the same group, there is no connection relationship between the devices; if the connection relationship is found, the analysis ends; if the connection relationship is not found, proceed to step (6). (6) Search for the switches connected to the two non-switch devices respectively. If the relevant switches are in the same group, the connection search is completed; otherwise, there is no physical link between the two non-switch devices.

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