Distribution Network Outage Verification and Anomaly Location System Based on Topology Analysis

Abstract

This invention relates to the field of topology analysis technology, specifically to a distribution network outage verification and anomaly location system based on topology analysis. The system includes a switch event capture module, a topology dynamic reconstruction module, an impedance benchmark generation module, and an anomaly location execution module. Specifically: the switch event capture module analyzes switch change signals from distribution terminals in real time, outputting a queue of trigger events containing switch state change attributes and topology identifiers; and acquires the original topology network; the topology dynamic reconstruction module detects joint switches in joint switch closure events based on switch state change attributes; and generates a topology connection relationship containing bidirectional power supply paths based on the topology identifiers; the impedance benchmark generation module generates a set of impedance benchmark values ​​based on the bidirectional power supply path topology connection relationship; and the anomaly location execution module collects port impedance measurements of sectional switches in real time, compares these port impedance measurements with the impedance benchmark value set, and determines the logical node of the fault point.

Description

Technical Field

[0001] This invention relates to the field of topology analysis technology, specifically to a power outage verification and anomaly location system for distribution networks based on topology analysis. Background Technology

[0002] Traditional distribution network anomaly location methods are usually based on static topology network design, which is difficult to adapt to dynamic topology changes (such as network reconfiguration caused by switch actions). Especially when a combined switch closes to form a ring network, the following problems exist: First, the lag in topology updates leads to inaccurate power supply path analysis and makes it impossible to capture bidirectional power supply relationships in real time; second, the impedance benchmark calculation does not consider the impact of dynamic ring networks, resulting in a large deviation between the equivalent impedance parameters of sectional switches and the actual operating state; third, fault location relies on impedance comparison on a single power source side, which cannot effectively identify bidirectional impedance changes in the ring network.

[0003] Existing technologies often employ fixed topology models and preset impedance thresholds, which can easily lead to misjudgments or delays in frequently switching distribution network scenarios, severely impacting the efficiency of power outage verification and the accuracy of fault isolation. Summary of the Invention

[0004] The purpose of this invention is to provide a power outage verification and anomaly location system for distribution networks based on topology analysis, in order to solve the problems mentioned in the background art, wherein the specific technical problems are as follows:

[0005] How to quickly generate bidirectional power supply paths in a ring network and accurately mark the affected feeder areas when switch displacement causes dynamic topology reconfiguration;

[0006] How to generate impedance reference values ​​that adapt to the ring network structure based on dynamic topology relationships, and solve the problem of mismatch between traditional static impedance models and real-time operating conditions;

[0007] How to achieve bidirectional tracing and precise location of fault points through a multi-source impedance comparison mechanism.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a distribution network outage verification and anomaly location system based on topology analysis, comprising a switch event capture module, a topology dynamic reconstruction module, an impedance reference generation module, and an anomaly location execution module, wherein:

[0009] The switch event capture module analyzes the switch change signal of the power distribution terminal in real time, outputs a trigger event queue containing switch status change attributes and topology identifiers; and obtains the radial power distribution network connection relationship stored in the topology library as the original topology network.

[0010] The topology dynamic reconstruction module detects the joint switch of the joint switch closing event based on the switch state change attribute of the trigger event queue; locates the end node connected to the joint switch in the original topology network based on the topology identifier of the trigger event queue, merges the end node into the ring network common node, generates a topology connection relationship containing bidirectional power supply paths, and marks the affected feeder segment area as the topology affected area.

[0011] The impedance reference generation module calculates the upstream and downstream equivalent impedance parameters of each segment switch in the topology influence area based on the topology connection relationship of the bidirectional power supply path, and generates a set of impedance reference values.

[0012] The anomaly location execution module collects the port impedance measurement value of the segmented switch in real time, compares the port impedance measurement value with the impedance reference value set, and determines the logic node of the fault point.

[0013] The switch event capture module analyzes the change signal in real time, filters out the joint switch closing event, locates the original topology end node and merges it into the ring network common node, and generates a bidirectional power supply path after eliminating the breakpoint. By dividing the upstream and downstream influence areas, the problem that the traditional static model cannot adapt to the ring network reconstruction is solved, and the topology update is synchronized with the real-time operation status.

[0014] The bidirectional power supply path is decomposed into independent paths for the main power supply side and the tie power supply side, and the upstream and downstream equivalent impedances of the sectional switches are calculated segment by segment. A structured impedance reference set is generated based on line parameters and load distribution, which overcomes the defect of traditional methods that ignore the superposition effect of bidirectional impedance in the ring network and provides dynamic matching reference parameters for anomaly location.

[0015] The anomaly location execution module collects port impedance through measurement devices and compares the deviation of the main power supply side with the phase consistency of the interconnection power supply. Combined with the upstream traceability verification mechanism and the downstream path impedance change detection, it realizes bidirectional logical node locking of the fault point, solves the problem of missed detection by the single comparison mechanism, and improves the positioning accuracy in complex ring network scenarios.

[0016] In some embodiments, the topology dynamic reconstruction module includes a joint switch determination unit, which is used for detecting joint switch closure events. The detection of joint switch closure events includes:

[0017] Extract the switch state change attributes from the trigger event queue, and filter out switches with operation type of "closed", switch type of "joint switch" and historical state verification as "open" to be used as joint switches for joint switch closure events.

[0018] In some embodiments, the topology dynamic reconstruction module includes a topology update unit, which is used to generate the topology connection relationship of the bidirectional power supply path. The generation of the topology connection relationship of the bidirectional power supply path includes:

[0019] Based on the topology identifier in the trigger event queue, obtain the terminal nodes connected to the combined switch in the original topology network, including upstream terminal nodes and downstream terminal nodes. The upstream terminal node represents the terminal node on the nearest power supply side connected to the combined switch; the downstream terminal node represents the terminal node on the farthest power supply side connected to the combined switch.

[0020] The electrical connection points of the upstream and downstream end nodes are merged into a common ring network node, eliminating the breakpoints in the original topology network; the load measurement device mapping relationship of the end nodes before the merger is inherited; the end nodes and associated lines before the merger are deleted in the original topology network; a new common ring network node is added to generate the topology connection relationship of bidirectional power supply path.

[0021] In some embodiments, the topology dynamic reconstruction module includes a marking unit for marking affected feeder segment regions as topology affected regions;

[0022] The marked affected feeder segment areas include: the upstream affected area and the downstream affected area; wherein: the upstream affected area extends from the ring network common node back to the set of feeder end equipment on the upstream power supply side, and the downstream affected area extends from the ring network common node to the set of feeder first equipment on the downstream power supply side;

[0023] The marking of the affected feeder segment areas as topology influence areas includes: marking the feeder segment numbers, equipment lists, and topology boundary information in the upstream and downstream influence areas as topology influence areas.

[0024] In some embodiments, the process of generating the impedance reference value set is as follows:

[0025] Based on the bidirectional power supply path topology, the bidirectional power supply path is decomposed into two independent power supply paths. One path starts from the main power supply side, extends through the feeder where the original upstream end node is located to the ring network common node; the other path starts from the tie power supply side, extends in the opposite direction through the feeder where the original downstream end node is located to the ring network common node.

[0026] For each path, the equivalent impedance parameters of each section switch are calculated segment by segment based on the line parameters and load distribution;

[0027] For each sectionalizing switch within the topology influence area, calculate the equivalent impedance on both sides, including the upstream equivalent impedance and the downstream equivalent impedance. The upstream equivalent impedance is traced back from the current switch to the power supply side, accumulating the impedance values ​​of all lines and equipment in the path until the nearest power supply node. The downstream equivalent impedance is traced back from the current switch to the load side, accumulating the impedance values ​​of the downstream lines and equipment directly connected to it.

[0028] After completing the equivalent impedance calculation for all sectional switches, the upstream equivalent impedance, downstream equivalent impedance, and corresponding power supply path of each switch are summarized into structured data to form a set of impedance reference values.

[0029] In some embodiments, the process for determining the logical node of the fault point is as follows:

[0030] The port impedance values ​​of each sectional switch are collected using measuring devices deployed at the sectional switches.

[0031] Impedance deviation analysis is performed on each sectional switch, including main power supply impedance comparison and tie power supply impedance comparison. The main power supply impedance comparison is the deviation of the port impedance measurement value from the upstream equivalent impedance of the reference; the tie power supply impedance comparison is the phase consistency between the measured impedance and the downstream equivalent impedance of the reference.

[0032] If the impedance comparison on the main power supply side is abnormal, the upstream traceability verification mechanism is triggered, and the topology identifier of the segment switch that failed verification is obtained; if the impedance comparison on the interconnection power supply side is abnormal, the downstream path impedance change detection is triggered, and the path impedance change point is detected.

[0033] The topology identifier of the failed sectionalizing switch and the path impedance mutation point are used as the logical node of the fault point.

[0034] In some embodiments, the upstream tracing verification mechanism includes tracing upstream along the segmented switches to the power supply node and verifying the impedance deviation between adjacent switches segment by segment.

[0035] In some embodiments, the downstream path impedance change detection process includes: tracing downstream along the segmented switch to the common node of the ring network and detecting the path impedance change point.

[0036] Compared with the prior art, the beneficial effects of the present invention are:

[0037] By analyzing switch position signals in real time and dynamically reconstructing the topology, the problem of power supply path analysis error caused by the lag in topology updates in traditional static models is solved. It can quickly capture the ring network structure formed after the switch is closed, ensuring that the topology is consistent with the real-time operating state. Based on the topology decomposition and segment-by-segment equivalent impedance calculation of bidirectional power supply paths, a set of impedance reference values ​​is generated, which overcomes the impedance parameter deviation caused by the reliance on fixed preset values ​​in traditional methods and significantly improves the accuracy of anomaly judgment.

[0038] By employing a two-way analysis mechanism that compares impedance deviation on the main power supply side and verifies phase consistency on the interconnecting power supply side, the problem of easy omissions in single power supply side comparisons is solved. This mechanism can accurately trace impedance mutation points in upstream and downstream paths, reducing the false judgment rate. By marking feeder segmentation areas and ring network common nodes, it effectively supports fault location in mixed operation scenarios of radial and ring networks, shortens power outage verification time, and improves power supply restoration efficiency.

[0039] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the overall modules of the present invention;

[0041] Figure 2 This is a schematic diagram of the topology dynamic reconfiguration module unit of the present invention.

[0042] In the diagram: 100, Switch Event Capture Module; 200, Topology Dynamic Reconstruction Module; 201, Joint Switch Determination Unit; 202, Topology Update Unit; 203, Marking Unit; 300, Impedance Reference Generation Module; 400, Anomaly Location Execution Module. Detailed Implementation

[0043] To better understand the purpose, technical solution, and advantages of this application, the application is described and illustrated below in conjunction with the accompanying drawings and embodiments.

[0044] Unless otherwise defined, the technical or scientific terms used in this application shall have the general meaning understood by one of ordinary skill in the art to which this application pertains. Words such as “a,” “an,” “an,” “the,” “the,” and “these” used in this application do not indicate quantitative limitation and may be singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that comprises a series of steps or modules (units) is not limited to the listed steps or modules (units) but may include steps or modules (units) not listed, or may include other steps or modules (units) inherent to these processes, methods, products, or devices. Words such as “connected,” “linked,” and “coupled” used in this application are not limited to physical or mechanical connections but may include electrical connections, whether direct or indirect. “Multiple” used in this application refers to two or more. “And / or” describes the relationship between related objects, indicating that three relationships may exist; for example, “A and / or B” can represent: A alone, A and B simultaneously, and B alone. Normally, the character " / " indicates that the objects before and after it are in an "or" relationship. The terms "first," "second," "third," etc., used in this application are merely to distinguish similar objects and do not represent a specific order of objects.

[0045] Next, please refer to Figure 1 The present invention provides a technical solution: a power outage verification and anomaly location system for distribution networks based on topology analysis, comprising a switch event capture module 100, a topology dynamic reconstruction module 200, an impedance reference generation module 300, and an anomaly location execution module 400.

[0046] The switch event capture module 100 analyzes the switch change signals of the power distribution terminal in real time and outputs a queue of trigger events containing switch status change attributes and topology identifiers, specifically including:

[0047] The system receives switch change signals from switchgear in real time via distribution automation terminals or smart sensors; it parses the switch change signals in binary or message format to extract the switch number, change timestamp, current status (closed / open), and operation type (manual / automatic); it uses a state change detection algorithm (such as sliding window mean filtering) to eliminate jitter or instantaneous interference signals and retain only valid change events that last for more than a threshold time (such as 200ms).

[0048] The output trigger event queue data structure includes switch state change attributes and topology identifiers, where the switch state change attributes are as follows:

[0049] Switch unique number: globally unique device identifier (such as an asset code based on the IEC 61968 standard).

[0050] Switch types: classified as combined switches, sectionalizing switches, and circuit breakers, etc.

[0051] Operation type: Distinguish between operation sources such as closing, opening, and fault tripping.

[0052] Historical state verification: Compare the most recent recorded state of the switch in the topology library to ensure that the change event is a valid state transition (e.g., "from open to closed" is a valid closing event).

[0053] Timestamp: The Precision Time Protocol (PTP) is used to synchronize the clocks of all devices in the network to ensure that the timing of events is traceable.

[0054] Topology identifiers indicate the connection nodes (such as upstream node ID, downstream node ID) and feeder numbers of associated switches in a radial distribution network.

[0055] The switch event capture module 100 obtains the radial power distribution network connection relationships stored in the topology library as the original topology network, specifically including:

[0056] The original topology network stores the physical connection relationships of network nodes, switches, and feeders, and manages them using a graph database or relational database; the radial power distribution network connection relationships include single-source root nodes, closed-loop path verification tags, and independent power supply area identifiers for each feeder.

[0057] Please see Figure 2 The joint switch determination unit 201 in the topology dynamic reconstruction module 200 detects the joint switch of the joint switch closing event based on the switch state change attributes of the trigger event queue, specifically including:

[0058] Extract switch state change attributes from the trigger event queue and filter out change events that meet the following conditions: operation type is closure; switch type is combined switch; historical state verification: the switch was in the open state before the event was triggered; combined with the radial structure of the original topology network (single power supply, no closed loop path), confirm that the closure operation will not cause power conflict and eliminate malfunctions or interference signals.

[0059] The topology update unit 202 in the topology dynamic reconstruction module 200 locates the end node connected to the joint switch in the original topology network according to the topology identifier of the trigger event queue, and merges the end node into a ring network common node, generating a topology connection relationship containing bidirectional power supply paths, specifically including:

[0060] Based on the topology identifier in the trigger event queue, obtain the terminal nodes connected to the combined switch in the original topology network, including upstream terminal nodes and downstream terminal nodes. The upstream terminal node represents the terminal node on the nearest power supply side connected to the combined switch, and the downstream terminal node represents the terminal node on the farthest power supply side connected to the combined switch.

[0061] The electrical connection points of the upstream and downstream end nodes are merged into a ring network common node to eliminate the breakpoints in the original topology network; the load measurement device mapping relationship of the end nodes before the merger is inherited to ensure the continuity of subsequent monitoring data; the end nodes and associated lines before the merger are deleted from the original topology network; a new ring network common node is added to generate the topology connection relationship of bidirectional power supply path.

[0062] The marking unit 203 in the topology dynamic reconstruction module 200 marks the affected feeder segment regions as topology affected regions.

[0063] Specifically, the affected feeder segment areas are marked as upstream and downstream affected areas. The upstream affected area extends from the ring network common node back to the set of feeder end-stage devices on the upstream power supply side, while the downstream affected area extends from the ring network common node to the set of feeder beginning-stage devices on the downstream power supply side. Marking the affected feeder segment areas as topology affected areas includes: marking the feeder segment numbers, device lists, and topology boundary information within both the upstream and downstream affected areas as topology affected areas. This area serves as input parameters for fault location and impedance calculation, avoiding redundant processing of network-wide data.

[0064] The impedance reference generation module 300 calculates the equivalent impedance parameters upstream and downstream of each segment switch in the topology influence region based on the topology connection relationship of the bidirectional power supply path, and generates a set of impedance reference values, specifically including:

[0065] Obtain the adjusted bidirectional power supply path topology connection relationship and identify the feeder segment area affected by the combined switch merging operation, i.e. the topology affected area; this area includes the ring network common node (formed by merging the original upstream and downstream end nodes) and its connected bidirectional power supply lines, as well as the adjacent segment switches affected by the merging operation.

[0066] Based on the bidirectional power supply path topology, the bidirectional power supply path is decomposed into two independent power supply paths. One path starts from the main power supply side, extends through the feeder where the original upstream end node is located to the ring network common node; the other path starts from the tie power supply side, extends in the opposite direction through the feeder where the original downstream end node is located to the ring network common node.

[0067] For each path, the equivalent impedance parameters of each segment switch are calculated segment by segment based on line parameters (such as conductor type, length, cross-sectional area, etc.) and load distribution (inherited from the measurement device mapping data of the end node before merging).

[0068] For each sectionalizing switch within the topology influence area, calculate the equivalent impedance on both sides, including the upstream equivalent impedance and the downstream equivalent impedance. The upstream equivalent impedance is traced back from the current switch to the power supply side, accumulating the impedance values ​​of all lines and equipment in the path until the nearest power node (main power supply or tie power supply). The downstream equivalent impedance is traced back from the current switch to the load side, accumulating the impedance values ​​of the downstream lines and equipment directly connected to it.

[0069] After completing the equivalent impedance calculation for all sectional switches, the upstream equivalent impedance, downstream equivalent impedance, and their corresponding power supply path identifiers (such as main power supply path and tie power supply path) of each switch are summarized into structured data to form a set of impedance reference values.

[0070] The anomaly location execution module 400 collects the port impedance measurement values ​​of the sectionalizing switch in real time, compares these port impedance measurement values ​​with the set of impedance reference values, and determines the logic node of the fault point, specifically including:

[0071] The port impedance measurements of each sectionalizing switch are collected synchronously using measuring devices (such as smart terminals or merging units) deployed at the sectionalizing switches.

[0072] Impedance deviation analysis is performed on each sectional switch, including main power supply impedance comparison and tie power supply impedance comparison. The main power supply impedance comparison is the deviation of the port impedance measurement value from the upstream equivalent impedance of the reference; the tie power supply impedance comparison is the phase consistency between the measured impedance and the downstream equivalent impedance of the reference.

[0073] If the impedance comparison on the main power supply side is abnormal, the upstream tracing verification mechanism is triggered. The process traces upstream along the segment switch to the power node, verifies the impedance deviation of adjacent switches segment by segment, and obtains the topology identifier of the segment switch that failed verification. If the impedance comparison on the interconnection power supply side is abnormal, the downstream path impedance mutation detection is triggered. The process traces downstream along the segment switch to the ring network common node and detects the path impedance mutation point.

[0074] The topology identifier of the failed sectionalizing switch and the path impedance mutation point are used as the logical node of the fault point.

[0075] As can be seen from the above description, the power outage verification and anomaly location system based on topology analysis provided in this embodiment has the following technical effects:

[0076] By analyzing switch position signals in real time and dynamically reconstructing the topology, the problem of power supply path analysis error caused by the lag in topology updates in traditional static models is solved. It can quickly capture the ring network structure formed after the switch is closed, ensuring that the topology is consistent with the real-time operating state. Based on the topology decomposition of bidirectional power supply paths and the segmented equivalent impedance calculation, a set of impedance reference values ​​is generated, which overcomes the impedance parameter deviation caused by the reliance on fixed preset values ​​in traditional methods and significantly improves the accuracy of anomaly judgment.

[0077] By employing a two-way analysis mechanism that compares impedance deviation on the main power supply side and verifies phase consistency on the interconnecting power supply side, the problem of easy omissions in single power supply side comparisons is solved. This mechanism can accurately trace impedance mutation points in upstream and downstream paths, reducing the false judgment rate. By marking feeder segmentation areas and ring network common nodes, it effectively supports fault location in mixed operation scenarios of radial and ring networks, shortens power outage verification time, and improves power supply restoration efficiency.

[0078] It should be noted that the above modules can be functional modules or program modules, and can be implemented through software or hardware. For modules implemented through hardware, the above modules can reside in the same processor; or the above modules can be located in different processors in any combination.

[0079] It should be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. All other embodiments derived by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0080] Obviously, the accompanying drawings are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar situations based on these drawings without any creative effort. Furthermore, it is understood that although the work done in this development process may be complex and lengthy, for those skilled in the art, certain design, manufacturing, or production modifications made based on the technical content disclosed in this application are merely conventional technical means and should not be considered as insufficient disclosure of this application.

Claims

1. A power outage verification and anomaly location system for distribution networks based on topology analysis, characterized in that, include: The switch event capture module (100) is used to analyze the switch change signal of the power distribution terminal in real time and output a queue of trigger events containing switch status change attributes and topology identifiers. And obtain the radial power distribution network connection relationships stored in the topology library as the original topology network; The topology dynamic reconstruction module (200) is used to detect the joint switch of the joint switch closing event according to the switch state change attribute of the trigger event queue; locate the end node connected to the joint switch in the original topology network according to the topology identifier of the trigger event queue, merge the end node into the ring network common node, generate the topology connection relationship containing bidirectional power supply path, and mark the affected feeder segment area as the topology affected area. Impedance reference generation module (300) is used to calculate the upstream and downstream equivalent impedance parameters of each segment switch in the topology influence area based on the topology connection relationship of the bidirectional power supply path, and generate a set of impedance reference values. The anomaly location execution module (400) is used to collect the port impedance measurement value of the sectional switch in real time, compare the port impedance measurement value with the set of impedance reference values, and determine the logic node of the fault point. The topology dynamic reconstruction module (200) includes a joint switch determination unit (201) and a topology update unit (202). The joint switch determination unit (201) is used to detect joint switch closing events. The detection of joint switch closing events includes: extracting switch state change attributes from the trigger event queue, filtering out switches with operation type of closure, switch type of joint switch and historical state verification as open state, as joint switches for joint switch closing events; The topology update unit (202) is used to generate the topology connection relationship of the bidirectional power supply path. The generation of the topology connection relationship of the bidirectional power supply path includes: obtaining the terminal node connected to the joint switch in the original topology network according to the topology identifier in the trigger event queue, including the upstream terminal node and the downstream terminal node, wherein the upstream terminal node represents the terminal node connected to the joint switch on the nearest power supply side; the downstream terminal node represents the terminal node connected to the joint switch on the farthest power supply side; merging the electrical connection points of the upstream terminal node and the downstream terminal node into a ring network common node to eliminate the breakpoint of the original topology network; inheriting the load measurement device mapping relationship of the terminal node before the merger; deleting the terminal node and associated line before the merger in the original topology network; adding a ring network common node to generate the topology connection relationship of the bidirectional power supply path.

2. The power outage verification and anomaly location system for distribution networks based on topology analysis according to claim 1, characterized in that, The switch status change attributes include the switch's unique ID, switch type, operation type, historical status verification, and timestamp.

3. The power outage verification and anomaly location system for distribution networks based on topology analysis according to claim 1, characterized in that, The topology dynamic reconstruction module (200) includes a marking unit (203), which is used to mark the affected feeder segment area as the topology affected area; The marked affected feeder segment areas include: the upstream affected area and the downstream affected area; wherein: the upstream affected area extends from the ring network common node back to the set of feeder end equipment on the upstream power supply side, and the downstream affected area extends from the ring network common node to the set of feeder first equipment on the downstream power supply side; The marking of the affected feeder segment areas as topology influence areas includes: marking the feeder segment numbers, equipment lists, and topology boundary information in the upstream and downstream influence areas as topology influence areas.

4. The power outage verification and anomaly location system for distribution networks based on topology analysis according to claim 1, characterized in that, The process of generating the impedance reference value set is as follows: Based on the bidirectional power supply path topology, the bidirectional power supply path is decomposed into two independent power supply paths. One path starts from the main power supply side, extends through the feeder where the original upstream end node is located to the ring network common node; the other path starts from the tie power supply side, extends in the opposite direction through the feeder where the original downstream end node is located to the ring network common node. For each path, the equivalent impedance parameters of each section switch are calculated segment by segment based on the line parameters and load distribution; For each sectionalizing switch within the topology influence area, calculate the equivalent impedance on both sides, including the upstream equivalent impedance and the downstream equivalent impedance. The upstream equivalent impedance is traced back from the current switch to the power supply side, accumulating the impedance values ​​of all lines and equipment in the path until the nearest power supply node. The downstream equivalent impedance is traced back from the current switch to the load side, accumulating the impedance values ​​of the downstream lines and equipment directly connected to it. After completing the equivalent impedance calculation for all sectional switches, the upstream equivalent impedance, downstream equivalent impedance, and corresponding power supply path of each switch are summarized into structured data to form a set of impedance reference values.

5. The power outage verification and anomaly location system for distribution networks based on topology analysis according to claim 1, characterized in that, The process for determining the logical node of the fault point is as follows: The port impedance values ​​of each sectional switch are collected using measuring devices deployed at the sectional switches. Impedance deviation analysis is performed on each sectional switch, including main power supply impedance comparison and tie power supply impedance comparison. The main power supply impedance comparison is the deviation of the port impedance measurement value from the upstream equivalent impedance of the reference; the tie power supply impedance comparison is the phase consistency between the measured impedance and the downstream equivalent impedance of the reference. If the impedance comparison on the main power supply side is abnormal, the upstream traceability verification mechanism is triggered, and the topology identifier of the segment switch that failed verification is obtained; if the impedance comparison on the interconnection power supply side is abnormal, the downstream path impedance change detection is triggered, and the path impedance change point is detected. The topology identifier of the failed sectionalizing switch and the path impedance mutation point are used as the logical node of the fault point.

6. The power outage verification and anomaly location system for distribution networks based on topology analysis according to claim 5, characterized in that, The upstream tracing verification mechanism includes tracing upstream along the segmented switches to the power supply node and verifying the impedance deviation of adjacent switches segment by segment.

7. The power outage verification and anomaly location system for distribution networks based on topology analysis according to claim 5, characterized in that, The downstream path impedance mutation detection process includes: tracing downstream along the segmented switch to the common node of the ring network and detecting the path impedance mutation point.

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