A method, device and medium for testing secondary circuit of intelligent substation reconstruction and expansion

Abstract

The application discloses a kind of intelligent substation reconstruction and expansion secondary circuit test method, equipment and medium, it is related to electrical measurement technical field, including, according to circuit test programming information, to test source IED with test timing watermark is applied to test excitation, IED and station control layer response are collected to form measured response chain, compared with benchmark response chain to determine first test deviation and target boundary outside propagation edge, after inhibiting retest and recovering retest, boundary fault is associated with circuit, corresponding boundary outside associated IED and propagation edge are supplemented into secondary circuit test graph after retest, and response verification state is generated;Based on response verification state, the test excitation that has been applied is cancelled, IED configuration operation information adjusted during test is recovered, regression verification is carried out to IED configuration operation information after recovery, and reconstruction and expansion circuit test state is generated.The application realizes abnormal propagation path to be authorized, improves fault location accuracy and test integrity.

Description

Technical Field

[0001] This invention relates to the field of electrical measurement technology, and in particular to a method, equipment and medium for testing secondary circuits in the renovation and expansion of intelligent substations. Background Technology

[0002] With the increasing digitalization and networking of smart substations, secondary circuits are gradually evolving from traditional hard-wiring methods to virtual circuits based on IED communication configurations. Communication mechanisms such as GOOSE, SV, and MMS handle the exchange of protection, measurement, control, and monitoring information. During the renovation and expansion of smart substations, the addition or removal of equipment, adjustments to IED configurations, and changes in communication relationships can all cause changes in the secondary circuit topology. Current testing typically involves comparing configurations using SCD files before and after the renovation or expansion, determining the test objects based on the signal transmission, reception, and propagation relationships between IEDs, and verifying the secondary circuit functions by applying test stimuli and acquiring the equipment responses.

[0003] The existing secondary circuit testing for the renovation and expansion of smart substations still has two shortcomings: First, the test scope is mostly determined based on the differences in SCD configuration or the established circuit relationship, lacking dynamic identification of the actual response continuing to propagate outward from the test boundary along the IED node. When the configuration relationship deviates from the actual response propagation, it is difficult to accurately locate the initial response deviation and the corresponding outward propagation path. Second, there is a lack of a unified temporal correlation and repeatable verification mechanism between the test excitation and the multi-node response. After the abnormal response occurs, it usually relies on the result of a single test, making it difficult to verify the correlation between the abnormal response and the specific propagation edge through the propagation suppression, recovery, and retesting process, which affects the positioning accuracy and verification completeness of the secondary circuit testing for renovation and expansion. Summary of the Invention

[0004] In view of the aforementioned existing problems, the present invention is proposed.

[0005] Therefore, this invention provides a secondary circuit testing method for the renovation and expansion of intelligent substations to solve the problems of difficulty in locating abnormal propagation paths and insufficient verification of abnormal circuit associations.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: In a first aspect, the present invention provides a method for secondary circuit testing in the renovation and expansion of intelligent substations, comprising: collecting SCD files, equipment modification and IED configuration and operation information before and after renovation and expansion; performing version verification and IED identity alignment; extracting GOOSE, SV and MMS circuit relationships; verifying configuration differences and attaching them to IED configuration and operation information to generate a secondary circuit test diagram; based on the secondary circuit test diagram, determining the test source IED, target IED and associated IED along the signal propagation direction; encapsulating the circuit test execution elements into a circuit test task package; configuring test timing watermarks; performing response reception orchestration; constructing a baseline response chain; and selecting a boundary outside the associated IED. The propagation edge constructs an isolation verification loop to form loop test arrangement information. Based on the loop test arrangement information, test stimuli with test timing watermarks are applied to the test source IED. The responses of the IED and station control layer are collected to form a measured response chain. The measured response chain is compared with the baseline response chain to determine the initial test deviation and the propagation edge outside the target boundary. After suppressing retesting and restoring retesting, the boundary fault associated loop is verified. The corresponding boundary associated IED and propagation edge are added to the secondary loop test diagram and retested to generate a response verification status. Based on the response verification status, the applied test stimuli are canceled, the IED configuration and operation information adjusted during the test is restored, and the restored IED configuration and operation information is regressed and verified to generate the modification and expansion loop test status.

[0007] As a preferred embodiment of the secondary circuit testing method for intelligent substation renovation and expansion according to the present invention, the steps for generating the secondary circuit test diagram are as follows: The version validity of the SCD files before and after the renovation and expansion is checked. IED identity is aligned according to IED identifier and communication association. GOOSE, SV and MMS loop relationships are extracted respectively. Secondary loop correspondence is established along the signal transmitting end, receiving end and propagation direction. Based on the correspondence of the secondary loops, the connection relationships and propagation paths in the GOOSE, SV, and MMS loops are checked before and after to determine the configuration differences and attach them to the corresponding IED configuration and operation information. The secondary loop test diagram is generated by organizing the IED nodes and propagation edges corresponding to the configuration differences in a graph.

[0008] As a preferred embodiment of the secondary circuit testing method for intelligent substation renovation and expansion described in this invention, the step of encapsulating the circuit test execution elements into a circuit test task package includes the following steps: The starting transmitting node and the ending receiving node corresponding to the signal propagation direction in the secondary loop test diagram are located and configured. The IED corresponding to the starting transmitting node is determined as the test source IED, the IED corresponding to the ending receiving node is determined as the target IED, and the IED that carries the signal propagation between the two is determined as the associated IED, thus forming the secondary loop test range. Based on the scope of the secondary loop test, the test prerequisites are verified, the isolation positions are marked, the test stimulus and response sequence is arranged, the recovery operation after the test is completed is configured, the loop test execution elements are formed, and the loop test execution elements are attached to the corresponding IED and propagation edge and encapsulated into a loop test task package.

[0009] As a preferred embodiment of the secondary circuit testing method for intelligent substation renovation and expansion described in this invention, the step of constructing an isolation verification loop by selecting an outer boundary propagation edge around the associated IED to form circuit test arrangement information is as follows: The loop test task package is marked with test timing, and the test timing feature value is calculated and encoded into a test timing watermark based on the execution order of the test task. The test timing watermark is written into the corresponding test stimulus, and the loop test task package is attached along the signal propagation direction from the test source IED, associated IED to the target IED. The response node is located and the response order is arranged according to the response acceptance relationship of each IED. The test timing watermark is attached to the corresponding response node to construct the baseline response chain. Using the associated IEDs in the secondary loop test range as boundaries, and combining the modified and expanded SCD file and IED configuration and operation information, we screen outward propagation relationships that are not yet included in the secondary loop test diagram and connect IEDs outside the secondary loop test range, determine the candidate boundary propagation edges, mark the propagation suppression position, recovery path and response observation position according to the response acceptance position in the baseline response chain, construct the isolation verification loop and form loop test orchestration information.

[0010] As a preferred embodiment of the intelligent substation renovation and expansion secondary circuit testing method described in this invention, the steps for acquiring the IED and station control layer responses to form a measured response chain are as follows: Based on the loop test orchestration information, extract the current status of the test source IED and associated IED, perform alignment verification according to the test premise, filter the secondary loop test paths that pass the verification, apply test stimuli with test timing watermark to the test source IED according to the corresponding loop test task package, and generate the test stimulus execution status. Based on the test stimulus execution status, the IED response and station control layer response during the test are collected. The response that is not generated in this test is screened out with the test timing watermark as the alignment reference. The aligned response is attached to the corresponding IED node and arranged along the signal propagation direction to form a measured response chain.

[0011] As a preferred embodiment of the intelligent substation renovation and expansion secondary circuit testing method of the present invention, the steps of determining the initial test deviation and the outer propagation edge of the target boundary by comparing with the reference response chain are as follows: Starting from the test source IED and the test timing watermark, the measured response chain is aligned with the reference response chain. The response acceptance status of the corresponding IED node is compared along the signal propagation direction, the response acceptance deviation is calculated, and the first non-reference outward response node is located according to the change of the response acceptance deviation. The corresponding response deviation is determined as the first test deviation. Starting from the first non-benchmark outward response node, follow the measured response chain to the outside of the isolation verification ring to trace subsequent responses, extract the propagation relationship of the IEDs that carry subsequent responses and connect the inside and outside of the isolation verification ring, map the propagation relationship to the outer propagation edge of the candidate boundary, determine the corresponding outer propagation edge of the candidate boundary as the outer propagation edge of the target boundary, and locate the corresponding outer boundary associated IED.

[0012] As a preferred embodiment of the intelligent substation renovation and expansion secondary circuit testing method of the present invention, the steps for generating the response verification status are as follows: While keeping the test source IED, test stimulus and test timing watermark unchanged, the propagation suppression is implemented on the isolation position corresponding to the propagation edge outside the target boundary and then retested. The propagation edge outside the target boundary is restored and retested, and boundary retest response information is generated. Extract the suppressed retest response and the recovered retest response from the boundary retest response information, match them, calculate the correlation degree of the boundary retest response by combining the changes in the abnormal response of the associated IED outside the boundary and the deviation of the first test, determine the corresponding propagation path, and generate the boundary fault association loop; Based on the boundary fault associated loop, the corresponding boundary external associated IED and propagation edge are added to the secondary loop test diagram, the loop test task package is updated, and test stimuli are applied again. The actual test response chain formed by the retest is accepted and verified, and a response verification status is generated.

[0013] As a preferred embodiment of the intelligent substation renovation and expansion secondary circuit testing method of the present invention, the steps for generating the renovation and expansion circuit test status are as follows: Based on the response verification status, locate the test stimuli that are still in the applied state in each loop test task package, cancel them in reverse order according to the succession order in the measured response chain, collect the IED and station control layer responses during the cancellation period, verify the corresponding responses to fade away sequentially along the signal propagation direction, and form the test cancellation status; Based on the test cancellation status, using the IED configuration and operation information collected before the test as the regression benchmark, the configuration and operation items adjusted during the test are restored to the corresponding IED, the IED configuration and operation information is collected again, and the alignment is performed according to the IED identity and object attachment relationship. The test stimulus release status and configuration and operation item restoration status are verified, and the test status of the modification and expansion loop is generated.

[0014] In a second aspect, the present invention provides a computer device, including a memory and a processor, wherein the memory stores a computer program, wherein when the computer program is executed by the processor, it implements any step of the secondary circuit testing method for intelligent substation renovation and expansion as described in the first aspect of the present invention.

[0015] Thirdly, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein: when the computer program is executed by a processor, it implements any step of the secondary circuit testing method for intelligent substation renovation and expansion as described in the first aspect of the present invention.

[0016] The beneficial effects of this invention are as follows: By configuring test timing watermarks and constructing a baseline response chain and isolation verification loop, the test stimulus, response node and boundary position are associated, which is used to distinguish test tasks and determine verification positions, thereby improving the accuracy of attribution and the ability to identify boundary anomalies; by comparing the actual test with the baseline response chain to locate the deviation of the first test, the propagation edge outside the target boundary is suppressed and restored for retesting, thereby realizing the verification of the abnormal propagation path, which is used to supplement the IED outside the boundary and the propagation edge, thereby improving the accuracy of fault location and the completeness of the test. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A flowchart for testing methods of secondary circuits in the renovation and expansion of smart substations.

[0019] Figure 2 Generate a flowchart for the secondary circuit test diagram.

[0020] Figure 3 Flowchart for adding and verifying IEDs and propagation edges outside the boundary.

[0021] Figure 4 Flowchart for test incentive removal and configuration run regression verification. Detailed Implementation

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0025] Reference Figures 1-4 As one embodiment of the present invention, this embodiment provides a method for testing the secondary circuit of a smart substation renovation and expansion project, comprising the following steps: S1: Collect SCD files, equipment modification and IED configuration and operation information before and after the renovation and expansion, perform version verification and IED identity alignment, extract GOOSE, SV and MMS loop relationships, verify configuration differences and attach them to IED configuration and operation information, and generate secondary loop test diagrams.

[0026] S1.1: Verify the version validity of the SCD files before and after the renovation and expansion, align the IED identity based on the IED identifier and communication association, extract the GOOSE, SV and MMS loop relationships respectively, and establish the secondary loop correspondence along the signal transmitting end, receiving end and propagation direction.

[0027] Furthermore, structural integrity and version validity checks were performed on the SCD files before and after the renovation and expansion. The IED descriptions, communication configurations, and loop connection content in the files were checked to ensure continuous parsing. Missing, duplicate, or unconnected configuration content was marked. Using the IED identifier as the primary index, the corresponding devices before and after the renovation and expansion were located. Then, the connection objects and signal attributions of the devices before and after the configuration changes were verified in conjunction with the communication association. IEDs that maintained consistency were linked before and after the renovation. For IEDs with name adjustments or connection changes, their identities were corrected based on their communication connections, thus forming a foundation for IED identity mapping that can be used for comparison of secondary loops before and after the renovation and expansion.

[0028] After IED identity alignment is completed, the GOOSE, SV, and MMS loop relationships are analyzed along the signal transmitting and receiving ends of each IED, and the connection relationships between IED nodes are organized according to the signal propagation direction from the transmitting side to the receiving side. Using the identity-aligned IEDs as the corresponding benchmark, the transmitting, receiving, and intermediate connection relationships of the same signal propagation position before and after the renovation and expansion are aligned, and the corresponding connections before and after are established sequentially along each signal propagation path. This ensures that the GOOSE, SV, and MMS loops are associated under a unified IED object and propagation direction, and the signal connection relationships between each IED node and node are collected to generate secondary loop correspondences.

[0029] It should be noted that the SCD file is a system configuration file used to describe the IED configuration, communication connection and secondary circuit logic relationship in a smart substation. It is the basis for identifying changes in the secondary circuit before and after the renovation and expansion.

[0030] IED Configuration and Operation Information: This information reflects the current actual configuration and operating status of intelligent electronic devices and serves as the basis for verifying whether the SCD configuration content corresponds to the actual status of the field devices.

[0031] GOOSE, SV, and MMS loop relationships: These are used to characterize the transmission, reception, and propagation connections of event signals, sampled value signals, and monitoring information between IEDs, and are the basis for determining the signal transmission path of secondary loops.

[0032] S1.2: Based on the correspondence of the secondary loops, the connection relationships and propagation paths in the GOOSE, SV and MMS loops are checked before and after, the configuration differences are determined and attached to the corresponding IED configuration and operation information, and the IED nodes and propagation edges corresponding to the configuration differences are organized into a graph to generate the secondary loop test graph.

[0033] Furthermore, the aforementioned secondary loop correspondence is read, and using the identity-aligned IED as the positioning reference, the connection positions and propagation continuity before and after the renovation and expansion are checked segment by segment along the signal propagation direction of the GOOSE, SV, and MMS loops. For the corresponding loops between the same transmitting and receiving nodes, the retention, addition, cancellation, and connection transfer of propagation edges are checked, and IED nodes or propagation edges that cannot maintain the original correspondence are marked as changed positions. The changed positions in continuous propagation paths are merged to avoid the same configuration change being recorded repeatedly at different loop levels, so that configuration differences can be attributed to specific IED nodes and propagation relationships between nodes, forming configuration difference positioning content.

[0034] The configuration difference location information is then reattached to the corresponding IED configuration operation information. The correspondence between the changed IED nodes and propagation edges and the actual field configuration is verified, retaining configuration differences that can complete the identification of device identities and loop locations. Differential IED nodes with a connection relationship are connected according to the signal propagation direction. Propagation edges represent loop connections between adjacent IEDs. Differential nodes and propagation edges on the same propagation path are continuously organized. Difference relationships in different GOOSE, SV, and MMS loops are merged according to the corresponding IEDs, so that the diagram simultaneously reflects the configuration change location, signal propagation direction, and associated IED range, generating a secondary loop test diagram.

[0035] S2: Based on the secondary loop test diagram, determine the test source IED, target IED and associated IED along the signal propagation direction, encapsulate the loop test execution elements into a loop test task package, configure test timing watermark, perform response reception orchestration, construct a baseline response chain, select the outer propagation edge of the boundary around the associated IED to construct an isolation verification loop, and form loop test orchestration information.

[0036] S2.1: Locate the starting transmitting node and the ending receiving node corresponding to the signal propagation direction in the secondary loop test diagram. Determine the IED corresponding to the starting transmitting node as the test source IED, the IED corresponding to the ending receiving node as the target IED, and the IED that carries the signal propagation between the two as the associated IED, thus forming the secondary loop test range.

[0037] Furthermore, the secondary loop test diagram is read to locate the IED node and propagation edge corresponding to the configuration difference. Using the signal propagation direction as a reference, the transmission relationship is traced step-by-step from the propagation position of the configuration difference towards the signal source side until the IED node that first sends the test-related signal in the current propagation path is located. This IED node is then designated as the starting transmission node. Next, the reception relationship is traced step-by-step from the propagation position of the configuration difference towards the signal receiver side until the IED node that last receives the test-related signal in the current propagation path is located. This IED node is then designated as the ending receiving node. The IED corresponding to the starting transmission node is designated as the test source IED, and the IED corresponding to the ending receiving node is designated as the target IED, thus clarifying the application location of the test stimulus and the final verification location of the test response.

[0038] The propagation edges between adjacent IED nodes are examined segment by segment along the signal propagation path from the test source IED to the target IED. IEDs located between the test source IED and the target IED, participating in the current test signal reception, processing, or continued transmission, are identified as associated IEDs. For secondary loops with propagation branches, the propagation edge corresponding to the configuration difference is used as the path positioning reference. Only the propagation path starting from the test source IED, passing through the configuration difference location, and reaching the target IED is retained; branches that do not pass through the configuration difference location are excluded from the current test range. IED nodes and propagation edges are organized according to the sequential positions of the test source IED, associated IED, and target IED in the signal propagation direction to form the secondary loop test range.

[0039] S2.2: Based on the secondary loop test scope, verify the test prerequisites, mark the isolation positions, arrange the test stimulus and response sequence, configure the recovery operation after the test, form the loop test execution elements, and attach the loop test execution elements with the corresponding IED and propagation edge and encapsulate them into a loop test task package.

[0040] Furthermore, test paths are located one by one around the secondary loop test range. Based on the positions of the test source IED, associated IED, and target IED in the signal propagation direction, the applyable status of the test stimulus input corresponding to the test source IED, the reception and forwarding status of the corresponding loop of the associated IED, and the collectable status of the response position corresponding to the target IED are verified. These verifications are established as test prerequisites. The propagation edges connecting IEDs within the secondary loop test range to IEDs outside the range are located at their boundary positions, which are then marked as isolation positions. Using the test source IED as the test stimulus application node, the test stimulus application process and response acceptance sequence are arranged along the propagation direction from the test source IED and associated IED to the target IED. IED configuration and operation information adjusted during the test, along with corresponding recovery operations, are recorded, forming the loop test execution elements.

[0041] The loop test execution elements are linked to the corresponding IED nodes and propagation edges within the secondary loop test range. Test prerequisites are linked to the corresponding test path, isolation positions are linked to the propagation edges connecting IEDs outside the test range, test stimuli are linked to the test source IED, the response acceptance order is arranged according to the signal propagation position from the associated IED to the target IED, and recovery operations are linked to the IED where configuration and operation adjustments have occurred. All loop test execution elements are collected according to the complete test path between the same test source IED and the target IED, and the test start, stimulus application, response acquisition, and state recovery operations are organized in signal propagation order, encapsulating them into a loop test task package.

[0042] S2.3: Mark the test timing of the loop test task package, calculate the test timing feature value in combination with the execution order of the test task and encode it to form a test timing watermark, write the test timing watermark into the corresponding test stimulus, attach the loop test task package along the signal propagation direction from the test source IED, associated IED to the target IED, locate the response node and arrange the response order according to the response acceptance relationship of each IED, attach the test timing watermark to the corresponding response node, and construct the baseline response chain.

[0043] Furthermore, based on the task organization order of each loop test task package, and using the corresponding test source IED and test path as timing marker objects, an independent timing position is configured for each loop test task package according to the actual execution order of the test tasks. The execution order of the test tasks is combined with the number of nodes and propagation level in the corresponding test path to calculate test timing feature values. These feature values ​​are then encoded to form a test timing watermark that can distinguish different loop test task packages. The test timing watermark is written into the corresponding test stimulus, establishing a fixed timing correspondence between the test stimulus and the loop test task package.

[0044] A loop test task package is deployed along the signal propagation direction from the test source IED, associated IEDs, to the target IED. The test source IED is set as the response start node, each associated IED is set as an intermediate response node according to the signal arrival order, and the target IED is set as the response end node. The connection relationship between response nodes is determined based on the propagation edges between adjacent IEDs. The response nodes are arranged according to the order in which the test stimulus is transmitted from the test source IED to the target IED, so that the test stimulus, IED nodes, and propagation positions in the same loop test task package form a continuous response sequence.

[0045] The test timing watermark is attached to each response node in the corresponding response sequence, so that response nodes within the same loop test task package use the same test timing watermark for task attribution. The test source IED, associated IED, and target IED are connected according to the established sequential connection relationships between response nodes. The test timing watermark and propagation position corresponding to each response node are preserved, and the expected response process corresponding to each loop test task package is organized into a continuous chain structure to construct the baseline response chain.

[0046] The formula for calculating the test timing characteristic value is: ; in, Indicates the first Test timing characteristics of each loop test task package Indicates the first The execution sequence number in each loop test task package. Indicates the first Number of IED nodes in each loop test task package Indicates the first The number of propagation levels in a loop test task package. This indicates the loop test task package number.

[0047] It should be noted that the formula uses the execution order of the test tasks as the basic position of the test timing characteristics, and introduces the number of IED nodes and the number of propagation levels in the test path to structurally modify the basic position. The number of IED nodes reflects the scale of the devices covered by the test path, and the number of propagation levels reflects the path depth of the test stimulus from the test source IED to the target IED. The product of the two is used to characterize the coupling degree between the path scale and the propagation depth. Then, logarithmic processing is used to compress the numerical expansion caused by the increase in path complexity, and the sum of the two is used for scale constraint, so that test paths of different lengths and propagation depths form differentiated correction amounts, thereby enabling the test timing characteristic value to simultaneously reflect the execution order of the test tasks and the propagation structure characteristics of the corresponding test paths.

[0048] The execution order number involved in the calculation in the formula is determined sequentially according to the actual execution order of each loop test task package in the test orchestration information, and is directly used as the basic quantity of the test timing characteristic value; the number of IED nodes is obtained by counting the total number of test source IEDs, associated IEDs and target IEDs along the corresponding test path, and is used to characterize the loop scale covered by the current test task; the number of propagation levels starts with the location of the test source IED as the starting level, and increases by one level for each propagation edge crossed along the signal propagation direction, with the number of propagation levels of the corresponding test path determined by the level of the target IED. The number of IED nodes and the number of propagation levels first form a coupling quantity, and after logarithmic compression and scale constraints, it is used as a structural correction quantity, which participates in the calculation of test timing characteristic value together with the execution order number.

[0049] S2.4: Using the associated IEDs in the secondary loop test range as boundaries, and combining the modified and expanded SCD file and IED configuration and operation information, screen outward propagation relationships that are not yet included in the secondary loop test diagram and connect IEDs outside the secondary loop test range, determine the candidate boundary propagation edges, mark the propagation suppression position, recovery path and response observation position according to the response acceptance position in the baseline response chain, construct the isolation verification loop and form loop test orchestration information.

[0050] Furthermore, using the associated IED within the secondary loop test range as the boundary positioning node, the communication connection relationships in the modified and expanded SCD file are retrieved from the associated IED along the signal transmission direction outwards from the secondary loop test range. Simultaneously, the configuration and operation information of the corresponding IED is called to verify the on-site connection status. Propagation relationships not included in the secondary loop test diagram, where the transmitting end is within the secondary loop test range and the receiving end is outside the secondary loop test range, are extracted separately. Propagation relationships that only exist in the SCD file but have not formed an on-site communication connection are excluded. Outward propagation relationships that have completed configuration and operation status verification are identified as candidate outer boundary propagation edges.

[0051] For each candidate outer boundary propagation edge, the corresponding response node of the associated IED connected to the candidate outer boundary propagation edge is located in the baseline response chain. The position where the associated IED transmits the response to the outer boundary IED is used as the boundary verification entry point. The position on the candidate outer boundary propagation edge that can block the signal from continuing to propagate to the outer boundary IED is marked as the propagation suppression position. The operation path that re-establishes the original propagation relationship after the propagation suppression is lifted is marked as the recovery path. The response acquisition position of the receiving IED on the candidate outer boundary propagation edge is marked as the response observation position, so that propagation suppression, propagation recovery, and response acquisition correspond to the same candidate outer boundary propagation edge.

[0052] Based on the connection relationship between the propagation edge outside the candidate boundary and the associated IED, the propagation suppression position, recovery path, and response observation position are sequentially attached to the corresponding boundary verification entry point, forming a ring-shaped verification structure around the outside of the secondary loop test range, enabling the execution of suppression retesting and recovery retesting. Each ring-shaped verification structure is then associated with its corresponding baseline response chain and loop test task package, establishing a task correspondence. Test stimulus application, response reception, and boundary verification operations are collected to construct an isolated verification ring, forming loop test orchestration information.

[0053] S3: Based on the loop test arrangement information, apply test excitation with test timing watermark to the test source IED, collect the IED and station control layer response to form a measured response chain, compare it with the benchmark response chain to determine the first test deviation and the propagation edge outside the target boundary, verify the boundary fault associated loop through suppression retest and recovery retest, add the corresponding boundary associated IED and propagation edge into the secondary loop test diagram and retest, and generate the response verification status.

[0054] S3.1: Based on the loop test orchestration information, extract the current status of the test source IED and associated IED, perform alignment verification according to the test premise, filter the secondary loop test paths that pass the verification, apply test stimuli with test timing watermark to the test source IED according to the corresponding loop test task package, and generate the test stimulus execution status.

[0055] Furthermore, the loop test arrangement information is read, and the test source IED, associated IED, and corresponding secondary loop test paths are located according to the loop test task package. The current configuration and operation status of each IED is collected. Using the test prerequisites approved in the loop test task package as the verification benchmark, the current configuration and operation status of each IED is aligned with the corresponding test prerequisites node by node. The node status and propagation edge connection status are checked along the signal propagation sequence from the test source IED to the associated IED. Secondary loop test paths whose alignment content is consistent with the test prerequisites are retained. Secondary loop test paths with inconsistent status or interrupted propagation edge connections are stopped from this test execution, and the corresponding abnormal location, the reason for failure to pass the verification, and the secondary loop test path are recorded to form a path exclusion record for subsequent on-site verification, forming a set of secondary loop test paths that have completed the test prerequisite verification.

[0056] Extract the corresponding loop test task package from the secondary loop test path that has completed the test prerequisite verification, locate the test source IED and the test stimulus application position, and call the test stimuli sequentially according to the task execution order determined by the loop test orchestration information. Write the test timing watermark corresponding to the loop test task package into the test stimulus, set the execution status of the test source IED or inject a signal according to the application method of the test stimulus, and record the correspondence between the test stimulus start time, the test timing watermark and the test source IED. After the test stimulus is applied, connect the executed test stimulus to the corresponding secondary loop test path to generate the test stimulus execution status.

[0057] S3.2: Based on the test stimulus execution status, collect the IED response and station control layer response during the test, use the test timing watermark as the alignment benchmark to filter out responses not generated in this test, attach the aligned responses to the corresponding IED nodes, and arrange them along the signal propagation direction to form a measured response chain.

[0058] Furthermore, the test stimulus execution status is read, and response acquisition is initiated according to the test stimulus application time corresponding to the test source IED. Response records formed by associated IEDs, target IEDs, and the station control layer are collected along the secondary loop test path. Using the test timing watermark written in the test stimulus as the response attribution benchmark, the occurrence time in each response record is aligned with the timing position corresponding to the test timing watermark. Response records that fall within the corresponding test timing interval and are located on the corresponding secondary loop test path are retained, while response records occurring in other test timing intervals or from other secondary loop test paths are deleted, resulting in a valid response set corresponding to this test stimulus.

[0059] Based on the IED identity and signal propagation location in the valid response set, each IED response is attached to the corresponding IED node in the secondary loop test diagram, and the station control layer response is attached to the station control layer response location after the corresponding target IED. According to the signal propagation direction from the test source IED, associated IED, target IED to the station control layer, the attached response records are sorted according to their actual occurrence order. The propagation edge connection relationship between corresponding nodes of adjacent response records is checked, and response records that can be continuously connected according to propagation edges are connected sequentially. The first response corresponding to the test source IED is taken as the chain head, and the last response corresponding to the target IED or station control layer is taken as the chain tail, forming the measured response chain.

[0060] S3.3: Taking the test source IED and the test timing watermark as a common starting point, the measured response chain and the reference response chain are aligned node by node. The response acceptance status of the corresponding IED node is compared along the signal propagation direction, the response acceptance deviation is calculated, and the first non-reference outward response node is located according to the change of the response acceptance deviation. The corresponding response deviation is determined as the first test deviation.

[0061] Furthermore, using the response start position and test timing watermark corresponding to the test source IED as a unified alignment benchmark, the test source IED nodes in the measured response chain are aligned with the test source IED nodes in the benchmark response chain. The node correspondence between associated IEDs and target IEDs is established step-by-step along the signal propagation direction. For each group of corresponding IED nodes, the expected response position and the sequence of responses recorded in the benchmark response chain are extracted and compared item by item with the actual response position and sequence of responses formed by the same IED node in the measured response chain. Nodes with consistent response positions and sequences are recorded as benchmark acceptance states, while nodes with increased response positions, changed response directions, or altered sequence of responses are recorded as deviations from acceptance states.

[0062] Following the node arrangement order from the test source IED to the target IED, the baseline and deviation states of each IED node are quantified, the response acceptance deviation is calculated, and the response acceptance deviation of each IED node is arranged along the signal propagation direction. Starting from the test source IED, the changes in response acceptance deviation are checked node by node. The IED node in the measured response chain that first deviates from the acceptance state and the response propagates outward along the edge outside the baseline response chain is located. The corresponding IED node is determined as the first non-baseline outward response node, and the response acceptance difference generated by the first non-baseline outward response node relative to the baseline response chain is determined as the first test deviation.

[0063] The formula for calculating the response acceptance deviation is: ; in, Indicates the first The first loop test task package The response tolerance of each IED node This indicates the IED node number arranged along the signal propagation direction. Indicates the first The first loop test task package The response location offset of each IED node Indicates the first The first loop test task package The actual response order of each IED node in the measured response chain Indicates the first The first loop test task package The baseline response order of each IED node in the baseline response chain Indicates the first The first loop test task package Outward propagation offset of each IED node.

[0064] It should be noted that the formula characterizes the degree of deviation of the IED node from the reference response chain from three dimensions: response location, response order, and outward propagation. A nonlinear mapping is used to compress the multidimensional deviations into a uniform range. Adding a new response location, changing the order of responses, or allowing the response to continue propagating outside the reference response chain all increase the response deviation. When multiple deviations occur simultaneously, the deviation further increases. Simultaneously, the nonlinear mapping suppresses excessive accumulation of deviations, making the deviation changes between different IED nodes comparable. This facilitates the identification of the location where the response acceptance state first shows a significant change along the signal propagation direction.

[0065] The response position offset is obtained by statistically analyzing the newly added non-baseline response positions of the corresponding IED node and normalizing them relative to the number of measured response positions of the corresponding node. The actual response order is determined according to the order in which the IED nodes appear in the measured response chain, and the baseline response order is determined according to the expected arrangement position of the same IED node in the baseline response chain. The difference between the two orders is normalized by the number of IED nodes in the test path and then used in the calculation. The outward propagation offset is obtained by statistically analyzing the proportion of the response that continues to be transmitted by the corresponding IED node along the propagation edge outside the baseline response chain to the total outward response, and it is used together with the response position offset and the response order offset to calculate the response reception deviation.

[0066] S3.4: Starting from the first non-benchmark outward response node, trace the subsequent responses along the measured response chain to the outside of the isolation verification ring, extract the propagation relationship of the IED that carries the subsequent response and connects the inside and outside of the isolation verification ring, match the propagation relationship with the outer propagation edge of the candidate boundary, determine the corresponding outer propagation edge of the candidate boundary as the outer propagation edge of the target boundary, and locate the corresponding outer associated IED.

[0067] Furthermore, starting from the IED node corresponding to the first non-baseline outward response node, the actual response sequence recorded in the measured response chain is traced node by node outward from the isolation verification ring to check the propagation edge connection relationship between the IED nodes corresponding to subsequent responses. For each propagation edge carrying the actual response, the locations of the sending IED and the receiving IED are checked. Propagation edges where the sending IED is located inside the isolation verification ring and the receiving IED is located outside the isolation verification ring are extracted separately, and the actual response transmission direction and the preceding and following response nodes corresponding to the propagation edge are retained to form an outward response propagation relationship across the boundary of the isolation verification ring.

[0068] The extracted outward response propagation relationships are matched one by one with the candidate boundary propagation edges according to the transmitting IED, receiving IED, and signal propagation direction. Candidate boundary propagation edges that do not correspond to the transmitting IED, receiving IED, or propagation direction are deleted. For candidate boundary propagation edges that have completed the three-item matching, it is further verified whether the outward response in the measured response chain reaches the corresponding transmitting IED from the first non-reference outward response node along the continuous propagation edge. Candidate boundary propagation edges that can form a continuous response propagation path are determined as target boundary propagation edges, and the IED corresponding to the receiving end of the target boundary propagation edge is determined as the boundary associated IED.

[0069] S3.5: While keeping the test source IED, test stimulus and test timing watermark unchanged, perform propagation suppression on the isolation position corresponding to the propagation edge outside the target boundary and then retest, restore the propagation edge outside the target boundary and retest, and generate boundary retest response information.

[0070] Furthermore, to ensure consistency between the test source IED, test stimulus content, test stimulus application method, and test timing watermark as in the initial test process, the propagation suppression position of the outer propagation edge outside the target boundary, as marked in the isolation verification loop, is located. The propagation edge outside the target boundary is temporarily blocked according to the propagation suppression position, preventing the test response generated by the transmitting IED of the outer propagation edge from being transmitted to the associated IED outside the boundary. After propagation suppression is completed, the test stimulus is reapplied to the test source IED according to the original loop test task package. The retest responses generated by the IEDs within the test range, the transmitting IED of the outer propagation edge outside the target boundary, and the associated IED outside the boundary are collected using the same test timing watermark, and the response propagation process under propagation suppression is recorded.

[0071] After completing the propagation suppression retest, the propagation suppression on the outer propagation edge of the target boundary is removed according to the recovery path calibrated in the isolation verification loop, restoring the signal transmission relationship between the transmitting IED on the outer propagation edge of the target boundary and the associated IED outside the boundary. Keeping the test source IED, test stimulus, and test timing watermark unchanged, the test stimulus is applied again according to the same test execution order, and the retest responses formed by each response node in the propagation recovery state are collected. The retest responses in the propagation suppression and propagation recovery states are organized according to the test timing watermark, IED node, and signal propagation position to generate boundary retest response information.

[0072] S3.6: Extract the suppressed retest response and the recovered retest response from the boundary retest response information, match them, calculate the boundary retest response correlation degree by combining the changes in the abnormal response of the associated IED outside the boundary and the deviation of the first test, determine the corresponding propagation path, and generate the boundary fault association loop.

[0073] Furthermore, the suppressed retest response formed when the propagation edge outside the target boundary is in a propagation suppression state and the recovered retest response formed when it is in a propagation recovery state are extracted from the boundary retest response information. A response correspondence between the two retests is established according to the test timing watermark, IED node, and signal propagation position. The response state of the associated IED outside the boundary is located in the two retests, and the changes in the abnormal response of the associated IED outside the boundary before and after propagation suppression are obtained. Simultaneously, the IED node corresponding to the deviation in the first test is located, and the response of the same IED node in the two retests is extracted to inherit the deviation change. The abnormal response changes and the first test deviation changes are organized into a retest change sequence corresponding to the same propagation edge outside the target boundary.

[0074] The correlation degree of the boundary retest response is calculated based on the consistency of changes between the suppressed and recovered retest responses. The target boundary propagation edge is retained where the abnormal response of the associated IED outside the boundary disappears after propagation suppression and the initial test deviation disappears synchronously, and where the abnormal response of the associated IED outside the boundary reappears after propagation recovery and the initial test deviation reappears synchronously. Using the IED node corresponding to the initial test deviation as the propagation starting point, the propagation is sequentially connected to the sending IED of the propagation edge outside the target boundary along the measured response chain. Then, the propagation edge outside the target boundary is connected to the associated IED outside the boundary. The complete propagation path is determined according to the actual transmission order of the response, and the propagation path that has completed the correlation verification is used to generate a boundary fault correlation loop.

[0075] The formula for calculating the correlation degree of the boundary retest response is: ; in, Indicates the first The correlation degree of the boundary retest response corresponding to the outer propagation edge of the target boundary. Indicates the first When the propagation edge outside the target boundary is in a propagation-suppressed state, the degree of abnormal response of the associated IED outside the corresponding boundary is as follows: Indicates the first When the propagation edge outside the target boundary is in the propagation recovery state, the degree of abnormal response of the associated IED outside the corresponding boundary is... Indicating the first state under propagation inhibition The response tolerance of each IED node Indicates the first state of propagation recovery The response tolerance of each IED node Indicates the number of the edge propagating outside the target boundary. This indicates the IED node number corresponding to the first test deviation.

[0076] It should be noted that the formula uses the response change between the propagation suppression retest and the propagation recovery retest as the basis for correlation judgment. It jointly evaluates the recovery amplitude of the abnormal response of the IED outside the boundary and the response of the IED node corresponding to the initial test deviation. The numerator adopts the geometric coupling of two types of positive changes, so that the degree of correlation is limited when either type of response does not reappear with the propagation recovery. The denominator uses the difference between the two types of change amplitudes to impose consistency constraints, so that the closer the recovery amplitudes of the two types of responses are, the higher the correlation. Thus, it simultaneously reflects the two characteristics of "synchronous reproduction" and "consistent change", and is used to verify the propagation correlation between the propagation edge outside the target boundary and the initial test deviation.

[0077] The degree of anomalous response of the out-of-boundary associated IED is determined by normalizing the number, duration, and degree of deviation of anomalous responses relative to the baseline response state during the retesting process. This results in anomalous response degrees under propagation suppression and propagation recovery states, with the difference between the two representing the recovery magnitude of the anomalous response. The initial test deviation corresponds to the response continuity deviation of the IED node in the two retests, calculated using the aforementioned method. The difference between the two retest results represents the recovery magnitude of the initial test deviation. A positive change retention operation is used to eliminate changes that are not enhanced after propagation recovery, ensuring that both types of effective recovery magnitudes participate in geometric coupling and change consistency calculations.

[0078] S3.7: Based on the boundary fault associated loop, add the corresponding boundary external associated IED and propagation edge into the secondary loop test diagram, update the loop test task package, and apply test stimulus again to verify the actual test response chain formed by the retest and generate the response verification status.

[0079] Furthermore, the boundary fault associated loop is read, and the associated IED outside the boundary and its corresponding propagation edge are located according to the propagation order in the boundary fault associated loop. The associated IED outside the boundary is added as a new IED node to the secondary loop test diagram, and the corresponding propagation edge is connected to the original IED node according to the actual transmitting IED, receiving IED and signal propagation direction. The node order between the test source IED and the associated IED outside the boundary is re-determined for the added propagation path. The new IED node and propagation edge are included in the secondary loop test scope, and the corresponding test prerequisites, response acceptance positions and recovery operations are added simultaneously. The loop test execution elements are reorganized and the loop test task package is updated.

[0080] Maintaining the correspondence between the test source IED and the test timing watermark according to the updated loop test task package, reapply test stimuli to the test source IED, and collect IED responses and station control layer responses along the updated secondary loop test path to form the actual test response chain corresponding to the retest. Align the retest actual test response chain with the updated node propagation order node by node, and check the response reception from the test source IED through the associated IED, the propagation edge outside the target boundary, to the associated IED outside the boundary, verifying the sequential order of each response node and the connection relationship of the propagation edge. Collect the retest process that has completed node reception and propagation path verification to generate a response verification status.

[0081] S4: Based on the response verification status, cancel the applied test stimulus, restore the IED configuration and operation information adjusted during the test, perform regression verification on the restored IED configuration and operation information, and generate the test status of the modified and expanded loop.

[0082] S4.1: Based on the response verification status, locate the test stimuli that are still in the applied state in each loop test task package, cancel them in reverse order according to the succession order in the measured response chain, collect the IED and station control layer responses during the cancellation period, verify the corresponding responses to fade away sequentially along the signal propagation direction, and form a test cancellation status.

[0083] Furthermore, the response verification status is read, and the execution status of the test stimuli is checked one by one according to the loop test task package. Test stimuli whose execution status is still marked as "applied" and for which no corresponding cancellation operation has been recorded are located. A cancellation correspondence is established between the corresponding test source IED, test path, and actual response chain. The cancellation order is determined according to the reverse order of the target IED, associated IED, and test source IED in the actual response chain. The cancellation of the execution status begins from the IED node at the end of the actual response chain, canceling the response hold status formed during the test level by level, and finally canceling the test stimuli corresponding to the test source IED. After each level of cancellation operation is completed, the status change of the corresponding IED node is recorded, so that the cancellation operation position corresponds one-to-one with the IED node in the actual response chain, forming a continuous test stimulus cancellation process.

[0084] During the step-by-step removal of test stimuli, response changes at the corresponding IED nodes and station control layer are continuously collected, and node alignment is performed according to the signal propagation direction in the original measured response chain. Using the moment of response change after test stimuli removal as the verification starting point, the fading order of the corresponding responses at the target IED, associated IED, and station control layer is checked step-by-step to confirm that subsequent responses fade before preceding responses, and the fading positions of each response are verified to be consistent with the propagation nodes in the measured response chain. Loop test task packages for which test stimuli have been removed and responses have faded step-by-step according to the signal propagation relationship are collected to form a test removal status.

[0085] S4.2: Based on the test cancellation status, using the IED configuration and operation information collected before the test as the regression benchmark, restore the configuration and operation items adjusted during the test to the corresponding IED, re-collect the IED configuration and operation information, perform front-to-back alignment according to the IED identity and object attachment relationship, verify the test stimulus release status and configuration and operation item restoration status, and generate the test status of the modification and expansion loop.

[0086] Furthermore, the test cancellation status is read, and the IED nodes whose configuration and operation were adjusted during the test are located according to the loop test task package. The configuration content of the corresponding IED node is extracted from the IED configuration and operation information collected before the test as a regression baseline. The configuration and operation adjustments recorded during the test are compared item by item with the regression baseline to determine the configuration and operation items that need to be restored and their corresponding IEDs. The configuration write-back is performed in reverse order of the test operations to restore the configuration and operation items changed during the test to the configuration state recorded before the test started. After the configuration write-back is completed, the restoration operation and completion status of each IED are recorded to form a configuration and operation restoration record.

[0087] After re-collecting the IED configuration and operation information following the configuration write-back, a one-to-one correspondence is established between the re-collected IED configuration and operation information and the IED configuration and operation information before testing, based on the IED identity identifier. Then, the configuration and operation items of the same IED node are checked against the previous and subsequent versions according to the object attachment relationship in the secondary loop test diagram. Simultaneously, the test stimulus execution status and test cancellation status are checked to confirm that the test stimuli corresponding to each test source IED have been cancelled, and the restored configuration and operation items are checked to ensure consistency with the regression baseline. The test stimulus cancellation status, IED configuration and operation recovery status, and corresponding loop test task packages are collected to generate the modification and expansion loop test status.

[0088] This embodiment also provides a computer device applicable to the secondary circuit testing method for the renovation and expansion of intelligent substations, including: a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions to implement the secondary circuit testing method for the renovation and expansion of intelligent substations as proposed in the above embodiment.

[0089] The computer device can be a terminal, comprising a processor, memory, communication interface, display screen, and input devices connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, carrier networks, NFC (Near Field Communication), or other technologies. The display screen can be an LCD screen or an e-ink screen. The input devices can be a touch layer covering the display screen, buttons, a trackball, or a touchpad on the computer device's casing, or an external keyboard, touchpad, or mouse.

[0090] This embodiment also provides a storage medium storing a computer program. When executed by a processor, the program implements the secondary circuit testing method for intelligent substation renovation and expansion proposed in the above embodiments. The storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0091] In summary, this invention achieves the association between test stimuli, response nodes, and boundary locations by configuring test timing watermarks and constructing a baseline response chain and isolation verification loop. This is used to distinguish test tasks and determine verification locations, improving the accuracy of attribution and the ability to identify boundary anomalies. By comparing the actual test results with the baseline response chain to locate the deviation of the first test, the propagation edge outside the target boundary is suppressed and restored for retesting, thereby verifying the abnormal propagation path. This is used to supplement the IED outside the boundary and the propagation edge, improving the accuracy of fault location and the completeness of the test.

[0092] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A testing method for secondary circuits in the renovation and expansion of intelligent substations, characterized in that, include: Collect SCD files, equipment modification and IED configuration and operation information before and after the renovation and expansion, perform version verification and IED identity alignment, extract GOOSE, SV and MMS loop relationships, verify configuration differences and attach them to IED configuration and operation information to generate secondary loop test diagrams. Based on the secondary loop test diagram, the test source IED, target IED and associated IED are determined along the signal propagation direction. The loop test execution elements are encapsulated into a loop test task package, and test timing watermarks are configured. Response reception is arranged, a baseline response chain is constructed, and an isolation verification loop is constructed by selecting the outer propagation edge of the associated IED to form loop test arrangement information. Based on the loop test arrangement information, test excitation with test timing watermark is applied to the test source IED, and the IED and station control layer response are collected to form a measured response chain. The actual test deviation and the propagation edge outside the target boundary are determined by comparing with the benchmark response chain. After suppressing retest and restoring retest, the boundary fault associated loop is verified. The corresponding boundary associated IED and propagation edge are added into the secondary loop test diagram and retested to generate the response verification status. Based on the response verification status, the applied test stimulus is revoked, the IED configuration and operation information adjusted during the test is restored, the restored IED configuration and operation information is regressed and verified, and the test status of the modified and expanded circuit is generated.

2. The testing method for secondary circuits in the renovation and expansion of intelligent substations as described in claim 1, characterized in that, The steps for generating the secondary circuit test diagram are as follows: The version validity of the SCD files before and after the renovation and expansion is checked. IED identity is aligned according to IED identifier and communication association. GOOSE, SV and MMS loop relationships are extracted respectively. Secondary loop correspondence is established along the signal transmitting end, receiving end and propagation direction. Based on the correspondence of the secondary loops, the connection relationships and propagation paths in the GOOSE, SV, and MMS loops are checked before and after to determine the configuration differences and attach them to the corresponding IED configuration and operation information. The secondary loop test diagram is generated by organizing the IED nodes and propagation edges corresponding to the configuration differences in a graph.

3. The testing method for secondary circuits in the renovation and expansion of intelligent substations as described in claim 2, characterized in that, The steps for encapsulating loop test execution elements into a loop test task package are as follows: The starting transmitting node and the ending receiving node corresponding to the signal propagation direction in the secondary loop test diagram are located and configured. The IED corresponding to the starting transmitting node is determined as the test source IED, the IED corresponding to the ending receiving node is determined as the target IED, and the IED that carries the signal propagation between the two is determined as the associated IED, thus forming the secondary loop test range. Based on the scope of the secondary loop test, the test prerequisites are verified, the isolation positions are marked, the test stimulus and response sequence is arranged, the recovery operation after the test is completed is configured, the loop test execution elements are formed, and the loop test execution elements are attached to the corresponding IED and propagation edge and encapsulated into a loop test task package.

4. The testing method for secondary circuits in the renovation and expansion of intelligent substations as described in claim 1, characterized in that, The steps for constructing an isolation verification loop by selecting an outer boundary propagation edge around the associated IED to form loop test orchestration information are as follows: The loop test task package is marked with test timing, and the test timing feature value is calculated and encoded into a test timing watermark based on the execution order of the test task. The test timing watermark is written into the corresponding test stimulus, and the loop test task package is attached along the signal propagation direction from the test source IED, associated IED to the target IED. The response node is located and the response order is arranged according to the response acceptance relationship of each IED. The test timing watermark is attached to the corresponding response node to construct the baseline response chain. Using the associated IEDs in the secondary loop test range as boundaries, and combining the modified and expanded SCD file and IED configuration and operation information, we screen outward propagation relationships that are not yet included in the secondary loop test diagram and connect IEDs outside the secondary loop test range, determine the candidate boundary propagation edges, mark the propagation suppression position, recovery path and response observation position according to the response acceptance position in the baseline response chain, construct the isolation verification loop and form loop test orchestration information.

5. The testing method for secondary circuits in the renovation and expansion of intelligent substations as described in claim 4, characterized in that, The steps for collecting IED and station control layer responses to form a measured response chain are as follows: Based on the loop test orchestration information, extract the current status of the test source IED and associated IED, perform alignment verification according to the test premise, filter the secondary loop test paths that pass the verification, apply test stimuli with test timing watermark to the test source IED according to the corresponding loop test task package, and generate the test stimulus execution status. Based on the test stimulus execution status, the IED response and station control layer response during the test are collected. The response that is not generated in this test is screened out with the test timing watermark as the alignment reference. The aligned response is attached to the corresponding IED node and arranged along the signal propagation direction to form a measured response chain.

6. The testing method for secondary circuits in the renovation and expansion of intelligent substations as described in claim 5, characterized in that, The steps for determining the initial test deviation and the outer propagation edge of the target boundary by comparing with the baseline response chain are as follows: Starting from the test source IED and the test timing watermark, the measured response chain is aligned with the reference response chain. The response acceptance status of the corresponding IED node is compared along the signal propagation direction, the response acceptance deviation is calculated, and the first non-reference outward response node is located according to the change of the response acceptance deviation. The corresponding response deviation is determined as the first test deviation. Starting from the first non-benchmark outward response node, follow the measured response chain to the outside of the isolation verification ring to trace subsequent responses, extract the propagation relationship of the IEDs that carry subsequent responses and connect the inside and outside of the isolation verification ring, map the propagation relationship to the outer propagation edge of the candidate boundary, determine the corresponding outer propagation edge of the candidate boundary as the outer propagation edge of the target boundary, and locate the corresponding outer boundary associated IED.

7. The testing method for secondary circuits in the renovation and expansion of intelligent substations as described in claim 1 or 6, characterized in that, The steps for generating the response verification status are as follows: While keeping the test source IED, test stimulus and test timing watermark unchanged, the propagation suppression is implemented on the isolation position corresponding to the propagation edge outside the target boundary and then retested. The propagation edge outside the target boundary is restored and retested, and boundary retest response information is generated. Extract the suppressed retest response and the recovered retest response from the boundary retest response information, match them, calculate the correlation degree of the boundary retest response by combining the changes in the abnormal response of the associated IED outside the boundary and the deviation of the first test, determine the corresponding propagation path, and generate the boundary fault association loop; Based on the boundary fault associated loop, the corresponding boundary external associated IED and propagation edge are added to the secondary loop test diagram, the loop test task package is updated, and test stimuli are applied again. The actual test response chain formed by the retest is accepted and verified, and a response verification status is generated.

8. The testing method for secondary circuits in the renovation and expansion of intelligent substations as described in claim 7, characterized in that, The steps for generating the test status of the modified and expanded circuit are as follows: Based on the response verification status, locate the test stimuli that are still in the applied state in each loop test task package, cancel them in reverse order according to the succession order in the measured response chain, collect the IED and station control layer responses during the cancellation period, verify the corresponding responses to fade away sequentially along the signal propagation direction, and form the test cancellation status; Based on the test cancellation status, using the IED configuration and operation information collected before the test as the regression benchmark, the configuration and operation items adjusted during the test are restored to the corresponding IED, the IED configuration and operation information is collected again, and the alignment is performed according to the IED identity and object attachment relationship. The test stimulus release status and configuration and operation item restoration status are verified, and the test status of the modification and expansion loop is generated.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the secondary circuit testing method for intelligent substation renovation and expansion as described in any one of claims 1 to 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the secondary circuit testing method for the renovation and expansion of intelligent substations as described in any one of claims 1 to 8.

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