IED equipment connection test method

Abstract

The present invention relates to the technical field of substations, and in particular to an IED device connection test method, the method comprising selecting a boundary range for testing the modified and expanded equipment from a modified and expanded SCD file; determining a central IED device and its associated IED devices in the selected boundary range, and determining a virtual IED device and a physical IED device according to the importance of the central IED device and its associated IED devices; in response to the number of physical IED devices being less than a set value, simulating a virtual IED device using a first virtual machine, and establishing a connection between the first virtual machine and the physical IED device; performing a transmission test on the first virtual machine and the physical IED device to determine the correctness of the virtual connection relationship. According to the solution of the present invention, the accuracy of the measurement results is effectively improved, and the test method can be applied in a variety of smart substation environments, thereby improving the applicability of the IED device virtual connection test method.

Description

Technical Field

[0001] The present invention relates to the technical field of substations, and more particularly to an IED device connection test method. Background Art

[0002] At present, smart substations have developed to the stage of accelerated construction, and the work of technical transformation, expansion, and maintenance of smart substations has increased year by year. In addition, the existing smart substations, especially the early smart substations, were built earlier and have many old equipment. The traditional transformation method is time-consuming and labor-intensive, the work is relatively complicated, and the operation and maintenance pressure is too high. At the same time, in the construction and expansion of smart substations, the traditional debugging method of secondary equipment still has the following problems:

[0003] 1. The expansion and reconstruction is carried out simultaneously with the secondary maintenance, and the relationship between IEDs (intelligent electronic devices) will become more complicated. If the debugging boundary and operation mode are determined entirely by human experience or by consulting the SCD (substation configuration description file), it will be very difficult, subjective, and the correctness is difficult to fully guarantee;

[0004] 2. At present, the traditional relay protection debugging method still uses manual methods to test all the protection devices and secondary virtual circuits on site one by one to verify the correctness of the secondary system of the entire station relay protection. This method is labor-intensive and prone to omissions, and cannot guarantee the correctness of the substation secondary system; at the same time, when verifying the correctness of the virtual connection, it may cause a large number of equipment to shut down, bringing unstable factors to safe production operation.

[0005] In response to the above problems, the station staff tried to replace the physical secondary circuit by establishing a virtual secondary circuit, and verified the correctness of the virtual connection relationship for the IED equipment in the virtual substation through a virtual test process. For example, the patent with the authorization announcement number CN109634849B and the name of the intelligent substation renovation and expansion virtual test device and method for intuitive signal interaction disclosed the use of the first virtual test signal interaction module and the second virtual test signal interaction module to virtualize different IED devices respectively, and by importing the SCD files before and after the renovation and expansion, the data entries in the sent and received interactive files were used to judge the correctness of the virtual connection relationship.

[0006] However, although this method of using virtual connection testing has improved the test efficiency to a certain extent, it also brings many problems. For example, the virtualized test environment increases the complexity of the system. For the situation where there are a large number of devices and many types in the smart substation, more management and configuration work is required. This may pose a challenge to people who are not familiar with virtualization technology, especially when rapid deployment or debugging is required. When the device is virtualized, all high-speed routing and packet forwarding, including encryption (IPsec and SSL) and load balancing, are executed by general-purpose CPUs instead of dedicated hardware processors. This may lead to a significant decrease in performance, especially when processing large amounts of data or high loads. Therefore, the virtual testing process requires a higher hardware configuration to implement. In addition, virtual testing requires a large amount of data and repetitive experiments, and is highly dependent on the accuracy of the model. If the correctness of the model cannot be guaranteed, the test results are unreliable.

[0007] Based on this, how to solve the problem that the accuracy and efficiency of virtual connection testing of current smart substation equipment cannot be effectively balanced is the focus of current research. Summary of the invention

[0008] In order to solve the technical problem of poor applicability of the above-mentioned virtual connection test method for smart substation equipment, the present invention provides the following technical solution.

[0009] The present invention provides an IED device connection test method, comprising: selecting a boundary range for testing a modified and expanded device from a modified and expanded SCD file; determining a central IED device and its associated IED devices in the selected boundary range, and determining a virtual IED device and a physical IED device according to the importance of the central IED device and its associated IED devices, wherein the importance is positively correlated with the power-off range impact weight and the association degree of the central IED device, and negatively correlated with the Euclidean distance between the IED virtual terminal and the standard virtual terminal; in response to the number of physical IED devices being less than a set value, simulating a virtual IED device using a first virtual machine, and establishing a connection between the first virtual machine and the physical IED device; and performing a transmission test on the first virtual machine and the physical IED device to determine the correctness of the virtual connection relationship.

[0010] The present invention selects a boundary range for testing, selects IED devices within the boundary range for virtual testing, and determines virtual devices and physical devices based on the importance of the devices, thereby using virtual machines to perform measurements in a virtual-real mode, effectively improving the accuracy of measurement results, and enabling the test method to be applied in a variety of smart substation environments, thereby improving the applicability of the IED device virtual connection test method.

[0011] Preferably, selecting a boundary range for testing the modified and expanded equipment from the modified and expanded SCD file includes: determining the test boundary of the modified and expanded equipment by comparing the consistency of the sub-CRC codes before and after the modified and expanded equipment.

[0012] In the present invention, the reconstruction and expansion area is determined through the CRC verification process, so as to determine the test boundary of the reconstruction and expansion, realize a targeted test process, avoid repeated testing of a large amount of data, and improve the test efficiency.

[0013] Preferably, the calculation formula of the importance is:

[0014] ;

[0015] ;

[0016] In the formula, Indicates the importance, Indicates the impact weight of the power outage range, Indicates the data attribute value of the central IED device i, represents the data attribute value of IED device j associated with central IED device i, Indicates the degree of association between each IED device and the central IED device. Indicates the European distance between the IED virtual terminal and the standard virtual terminal. Indicates IED virtual terminal The k-th data attribute value of Indicates standard virtual terminal The kth data attribute value of , where n represents the number of data attribute values.

[0017] Preferably, the virtual IED device and the physical IED device are determined according to the importance of the central IED device and its associated IED devices, including: selecting an IED as the central IED device from the modified and expanded devices in the modified and expanded SCD file; determining the directly associated devices and indirectly associated devices of the central IED device, and calculating the importance; setting the IED device with an importance higher than a set value as a physical IED device, and setting the IED device with an importance higher than a set value as a virtual device.

[0018] The present invention combines multiple factors such as power outage range and equipment relevance to achieve quantitative calculation of the importance of different IED devices, and sets the less important ones as virtual IED devices, so that the measurement process has the least impact on the test process of the entire substation, and improves the accuracy of the test results through physical testing. At the same time, it reduces the cumbersome virtual machine configuration process and effectively improves the test efficiency.

[0019] Preferably, the method further comprises: in response to the number of physical IED devices being greater than a set value, setting all IED devices within the boundary range as virtual devices, and performing transmission tests on different virtual IED devices through the first virtual machine and the second virtual machine.

[0020] Preferably, a transmission test is performed on the first virtual machine and the physical IED device, including: importing the modified and expanded SCD file into the virtual machine to perform virtual circuit simulation transmission; if the relevant parameters in the transmission process are consistent, the virtual connection relationship and the relevant configuration are correct.

[0021] Preferably, the relevant parameters include one or more of APPID, MAC address, goID, svID, gocbRef, dataSet and test flags, data type, number of channels, and optical ports.

[0022] By importing the SCD files before and after the renovation and expansion into the virtual machine and using the transmission test to implement the test process of the virtual connection relationship, it is possible to verify whether the configuration changes before and after the renovation and expansion affect the virtual connection relationship, thereby effectively improving the configuration accuracy.

[0023] Preferably, the virtual circuit simulation transmission includes: the first virtual machine and the physical IED device perform simulation transmission through SV and GOOSE message interaction.

[0024] Preferably, the method further includes: importing the SCD file before the modification and expansion and the SCD file after the modification and expansion into the first virtual machine respectively, comparing the test entry data before and after the modification and expansion, and determining the correctness of the virtual connection relationship.

[0025] The present invention compares the test results before and after the reconstruction and expansion to verify the impact of the configuration change on the virtual connection relationship, effectively improves the reliability of the substation configuration, facilitates timely discovery of errors in the SCD file after the reconstruction and expansion, and enables timely adjustments.

[0026] The beneficial effect of the present invention is that the present invention can effectively reduce the impact of the power outage scope by conducting a targeted test verification process in combination with the scope of renovation and expansion, and conduct a test process in a virtual-real mode in combination with the importance of the IED device, while being more in line with the test process of the actual device, and improving the accuracy of the virtual connection test of the IED device. At the same time, by selecting the physical device for testing, the debugging time can be effectively reduced and the efficiency of the entire test process can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0028] Figure 1 is a flow chart schematically illustrating an IED device connection test method according to an embodiment of the present invention;

[0029] Figure 2 FIG. 4 is a flowchart schematically illustrating a method for determining a virtual IED device and a physical IED device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0031] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0032] Figure 1 FIG. 1 is a flow chart schematically illustrating an IED device connection test method 100 according to an embodiment of the present invention.

[0033] like Figure 1 As shown, at step S101, a boundary range for testing the modified and expanded equipment is selected from the modified and expanded SCD file. In some embodiments, in order to simplify the test process, on-site debugging work and reduce the test scope, an IED device virtual connection test can be performed on the equipment in the modified and expanded area. Specifically, the test boundary of the modification and expansion can be determined by comparing the consistency of the sub-CRC code before and after the modification and expansion. The sub-CRC code of the SCD file before the modification and expansion is compared with the sub-CRC code of the SCD file after the modification and expansion for consistency, so as to divide the area of ​​the equipment that has changed, automatically identify the test boundary of the modification and expansion, and in this way, the test scope of the on-site IED device transmission can be reduced, and the power outage cycle of a single device during the entire test process can be shortened, thereby improving the test efficiency.

[0034] At step S102, the central IED device and its associated IED devices are determined in the selected boundary range, and the virtual IED device and the physical IED device are determined according to the importance of the central IED device and its associated IED devices. The importance is positively correlated with the power-off range impact weight and the degree of association with the central IED device, and negatively correlated with the Euclidean distance between the IED virtual terminal and the standard virtual terminal. For the power-off range impact weight, the larger the power-off range, the higher the importance of the device, and whether the power needs to be cut off during the test has a greater impact on the test process. Therefore, the larger the range of the primary equipment associated with the IED device, the greater the power outage risk and area it will face during the test, and the corresponding power outage range impact weight is also greater. For the degree of association with the central IED device, the closer the association with the central IED device, the higher the importance of the device. For the Euclidean distance between the IED virtual terminal and the standard virtual terminal: the closer the distance, the higher the importance of the device.

[0035] In some embodiments, when selecting a central IED device within a boundary range, an IED device may be randomly selected within the boundary range as the central IED device, or the central IED device may be selected according to a set rule. For example, multiple central IED devices may be randomly selected, and the device with the highest weight of the power outage range impact may be selected as the central IED device. When performing a test, the central IED device is virtualized first to reduce the adverse effects of the test process.

[0036] When determining the associated IED devices associated with the central IED device, it can be determined according to the virtual circuit relationship in the SCD file. For example, the IED devices in the SCD file can be graphically displayed using graphical SCD software, and then other associated IED devices associated with the central IED device can be automatically searched out according to the logical link diagram of the central IED.

[0037] Furthermore, the associated IED device can be selected according to the degree of association with the central IED device. For example, the degree of association between each IED device in the renovation and expansion equipment and the central IED device can be calculated, and a certain number of associated IED devices can be selected according to the degree of association. The degree of association between IED devices can be calculated by association rules, such as Apriori algorithm, partition-based algorithm and FP-tree frequency set algorithm, etc., by iteratively calculating frequent item sets and then generating association rules, so as to analyze the association relationship between IED devices.

[0038] When calculating the importance of an IED device, it can be calculated by "importance = power outage range impact weight + association degree with the central IED device - Euclidean distance", and this calculation process can roughly estimate the importance of the IED device. As another implementation, a more complex calculation formula can also be used to measure the importance of the IED device.

[0039] When allocating virtual IED devices and physical IED devices, a corresponding set threshold can be determined to distinguish virtual IED devices from physical IED devices according to the distribution of importance. Specifically, IED devices with importance higher than the threshold can be allocated as physical IED devices, and those with importance lower than the threshold can be allocated as virtual IED devices.

[0040] In step S103, in response to the number of physical IED devices being less than a set value, the first virtual machine is used to simulate the virtual IED device, and the first virtual machine is connected to the physical IED device. In another embodiment, when the number of physical IED devices is greater than the set value, all IED devices within the boundary range are set as virtual devices, and transmission tests are performed by virtualizing different IED devices through the first virtual machine and the second virtual machine.

[0041] In some embodiments, the number of physical IED devices can be counted. When the number is small, the virtual machine can be used for testing. When the number is large, it indicates that the substation is not suitable for the virtual IED device testing method, and the virtual test method is not recommended.

[0042] In the process of implementing the test, first, a virtual IED device is configured in a virtual environment. In this embodiment, the virtual IED device is virtualized by a first virtual machine, and the first virtual machine can virtualize one or more determined virtual IED devices. Next, it is necessary to establish a connection between the first virtual machine and the physical IED device to connect the physical IED device to the test environment. Then, a virtual circuit check and functional test will be performed to ensure the stability and interoperability of the system.

[0043] In step S104, a transmission test is performed on the first virtual machine and the physical IED device to determine the correctness of the virtual connection relationship.

[0044] In some embodiments, the transmission test of the first virtual machine and the physical IED device includes: importing the modified and expanded SCD file into the virtual machine to simulate the transmission of the virtual circuit; if the relevant parameters in the transmission process are consistent, the virtual connection relationship and the relevant configuration are correct. The relevant parameters include one or more of APPID, MAC address, goID, svID, gocbRef, dataSet and test flag, data type, number of channels, and optical port.

[0045] The virtual circuit simulation transmission includes: the first virtual machine and the physical IED device simulate transmission through SV and GOOSE message interaction. The transmission test can realize the communication test, function test and system-level test between IED devices. In the communication test, it can be tested whether the communication connection between IED devices is normal. In addition, a protocol analyzer can be used to capture the communication data packets between IED devices to check whether the data flow meets expectations. Timing test can also be performed to test whether the timing between IED devices is correct.

[0046] When performing functional testing, the interaction functions between devices can be tested through SV and GOOSE messages, such as GOOSE message exchange and SV message exchange. In addition, the various functions of IED devices can be tested separately, such as protection function, measurement function and control function. Furthermore, by injecting fault quantity into the device to simulate fault conditions such as short circuit and overload, the response of IED devices can be tested to see if they are correct.

[0047] For system-level functional testing, the functionality of the IED device as a system is tested to ensure that all associated IED devices can work together. Interoperability testing: Testing the interoperability between the IED device and other IED devices, relays, switchgear, etc. Performance testing: Testing the performance of the IED device under high load, such as response time, data processing capability, etc.

[0048] Furthermore, the SCD file before the modification and expansion and the SCD file after the modification and expansion may be respectively imported into the first virtual machine, and the test entry data before and after the modification and expansion may be compared to determine the correctness of the virtual connection relationship.

[0049] Figure 2 FIG. 2 is a flow chart schematically illustrating a method 200 for determining a virtual IED device and a physical IED device according to an embodiment of the present invention.

[0050] like Figure 2 As shown, at step S201, an IED is selected from the rebuilt and expanded devices in the rebuilt and expanded SCD file as the central IED device. The method of selecting the central IED device has been described in detail in the above content, and will not be repeated here.

[0051] In step S202, the directly associated devices and indirectly associated devices of the central IED device are determined, and the importance is calculated. The calculation formula of the importance is:

[0052] ;

[0053] ;

[0054] In the formula, Indicates the importance, Indicates the impact weight of the power outage range, Indicates the data attribute value of the central IED device i, represents the data attribute value of IED device j associated with central IED device i, Indicates the degree of association between each IED device and the central IED device. Indicates the European distance between the IED virtual terminal and the standard virtual terminal. Indicates IED virtual terminal The k-th data attribute value of Indicates standard virtual terminal The kth data attribute value of , where n represents the number of data attribute values. Indicates the degree of association between each IED device and the central IED device. The larger the value, the higher the importance of the corresponding IED device.

[0055] In step S203, the IED devices with a higher importance than a set value are set as physical IED devices, and the IED devices with a lower importance than the set value are set as virtual devices.

[0056] Take the process of testing whether the virtual connection relationship between the modified and expanded busbar protection device and other operating protection devices is correct as an example.

[0057] The CRC verification is performed on the SCD files before and after the renovation and expansion to determine the test boundary of the renovation and expansion. Within the selected boundary, the IED devices between the renovation and expansion bus protection device and other operating protection devices are displayed through the graphical SCD file tool, and the corresponding virtual terminal connection relationship is displayed.

[0058] The central IED device is selected from the IED devices between the modified and expanded busbar protection device and other operating protection devices, and the associated IED devices associated with the central IED device are searched. According to the above importance calculation method, the importance of the corresponding IED device is calculated, thereby determining the virtual IED device and the physical IED device.

[0059] The number of physical IED devices during the test process is determined. If it does not exceed the set value, it indicates that the test process can be applied to the virtual machine virtual test method. At this time, the first virtual machine can be configured in the virtual environment to obtain a virtual IED device, and the virtual IED device is connected to the physical device to perform a transmission test.

[0060] During the transmission test, the virtual IED device sends SV and GOOSE messages to other virtual IED devices or physical IED devices based on the simulated IED, and determines the correctness of the virtual connection by judging the receiving situation.

[0061] By analyzing the APPID, MAC address, goID, svID, gocbRef, dataSet and test flag, data type, number of channels, optical port and other communication parameters of the message received by the virtual IED device or the physical IED device, and whether they are consistent with the relevant parameters in the download configuration, and whether the values ​​transmitted in each channel are consistent with the values ​​of the corresponding channels of the virtual IED device, the virtual circuit and related configurations are judged to be correct. When inconsistency occurs, no message is received, or multiple transmissions and multiple receptions occur, it indicates that the virtual circuit is abnormal and there is a problem with the virtual connection relationship. The corresponding part of the corresponding SCD file should be checked for problems.

[0062] In the simulation test process, the first virtual machine can virtualize a central IED device or an associated IED device, and the first virtual machine or the second virtual machine can virtualize one or more IED devices, thereby achieving flexibility in the test process.

[0063] The present invention is based on a signal interaction mode, and a test system composed of a virtual machine and a physical device, a physical device simulated by a virtual machine, etc. can verify the correctness of a virtual circuit (virtual connection) and related configurations between various devices. The virtual machine can download related configurations according to the simulated device, that is, download the SCD file to the virtual machine, virtual machine A, B, or virtual machine A and the physical machine perform message interaction according to the virtual circuit between the simulated devices. In this embodiment, the correctness of the virtual circuit and related configurations can be verified by comparing the received message with the relevant parameters of the downloaded configuration to eliminate the potential safety hazards of the operation of the smart substation caused by the SCD virtual circuit.

[0064] In the description of this specification, "plurality" or "several" means at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0065] Although this specification has shown and described a number of embodiments of the present invention, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art will conceive of many modifications, changes and alternatives without departing from the ideas and spirit of the present invention. It should be understood that in the practice of the present invention, various alternatives to the embodiments of the present invention described herein may be employed.

Claims

1. A method for testing the connection of an IED device, characterized in that: include: Select the boundary range for testing the modified and expanded equipment from the modified and expanded SCD file; Determine a central IED device and its associated IED devices in a selected boundary range; Determining virtual IED devices and physical IED devices according to the importance of the central IED device and its associated IED devices includes: selecting an IED from the modified and expanded devices in the modified and expanded SCD file as the central IED device; determining the directly associated devices and the indirectly associated devices of the central IED device, and calculating the importance; setting the IED device with an importance higher than a set value as a physical IED device, and setting the IED device with an importance lower than the set value as a virtual device; The calculation formula for importance is: ； ； In the formula, Indicates the importance, Indicates the impact weight of the power outage range, Indicates the data attribute value of the central IED device i, represents the data attribute value of IED device j associated with central IED device i, Indicates the degree of association between each IED device and the central IED device. Indicates the European distance between the IED virtual terminal and the standard virtual terminal. Indicates IED virtual terminal The kth data attribute value of Indicates standard virtual terminal The kth data attribute value of , n represents the number of data attribute values; In response to the number of physical IED devices being less than a set value, simulating virtual IED devices using a first virtual machine, and establishing a connection between the first virtual machine and the physical IED devices; A transmission test is performed on the first virtual machine and the physical IED device to determine the correctness of the virtual connection relationship.

2. The IED device connection test method according to claim 1, characterized in that: Select the boundary range for testing the modified and expanded equipment from the modified and expanded SCD file, including: The test boundary of the modification and expansion is determined by comparing the consistency of the sub-CRC codes before and after the modification and expansion.

3. The IED device connection test method according to claim 1, characterized in that: Also includes: In response to the number of physical IED devices being greater than a set value, all IED devices within a boundary range are set as virtual devices, and transmission tests are performed on different IED devices virtually through the first virtual machine and the second virtual machine.

4. The IED device connection test method according to claim 1, characterized in that: Perform transmission tests on the first virtual machine and physical IED equipment, including: Import the modified and expanded SCD file into the virtual machine to simulate the transmission of the virtual circuit; If the relevant parameters in the transmission process are consistent, the virtual connection relationship and related configuration are correct.

5. The IED device connection test method according to claim 4, characterized in that: The relevant parameters include one or more of APPID, MAC address, goID, svID, gocbRef, dataSet and test flags, data type, number of channels, and optical ports.

6. The IED device connection test method according to claim 4, characterized in that: The virtual circuit simulation transmission includes: The first virtual machine and the physical IED device perform simulated transmission through SV and GOOSE message interaction.

7. The IED device connection test method according to claim 1, characterized in that: Also includes: The SCD file before the modification and expansion and the SCD file after the modification and expansion are respectively imported into the first virtual machine, and the test entry data before and after the modification and expansion are compared to determine the correctness of the virtual connection relationship.

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