Distribution line fault self-healing simulation method and device, medium and equipment

Abstract

According to the distribution line fault self-healing simulation method and device, the medium and the equipment provided by the invention, the physical model of the distribution line is constructed, and when any segment point in the physical model receives the fault simulation action, fault detection is performed on the operation state of the line section where the fault segment point is located. And if the operation state is a fault state, determining a target segment point which acts preferentially in each segment point based on a differential protection mechanism, sending an opening instruction to the target segment point, and then triggering a reclosing delay mechanism after the opening instruction is sent, so as to determine the fault type of the line section where the fault segment point is located. And if the fault type is a permanent fault, load transfer is carried out through an interconnection switch at the contact point. According to the scheme, a complete control chain of fault occurrence, differential protection action and time delay from opening to reclosing of a target segment point can be visually displayed. And meanwhile, self-healing action reproduction is carried out by virtue of a physical model, so that full verification of a self-healing control strategy can be realized on the premise of ensuring safety.

Description

Technical Field

[0001] This application relates to the field of simulation technology, and in particular to a method, apparatus, medium and equipment for simulating self-healing faults in power distribution lines. Background Technology

[0002] As smart grids place increasingly higher demands on power supply reliability, self-healing technology for distribution lines has developed rapidly. This technology can quickly isolate faulty areas and restore power to non-faulty areas after a fault occurs. To verify the effectiveness and reliability of self-healing control strategies, the industry commonly uses simulation methods to analyze the fault isolation and power restoration process, and optimizes control parameters accordingly to reduce the number of households affected by power outages and improve distribution network operating efficiency.

[0003] Current simulation methods primarily rely on two-dimensional software simulation or the construction of a 10kV high-voltage physical line. Two-dimensional simulation presents switch states and electrical quantity changes in abstract graphics, failing to intuitively reflect the details of self-healing control execution. While a 10kV physical line can reproduce the real electrical environment, it comes with high costs for equipment purchase, site construction, and safety protection, and is prone to equipment damage and personal injury risks. In summary, existing simulation methods are insufficient in terms of visualization and safety verification of critical control links. Summary of the Invention

[0004] The purpose of this application is to at least address one of the aforementioned technical deficiencies, particularly the shortcomings in the visualization and security verification of key control links in the prior art.

[0005] In a first aspect, this application provides a method for simulating self-healing faults in power distribution lines, the method comprising:

[0006] Construct a physical model of the power distribution lines, which includes multiple power distribution lines, as well as multiple segment points and connection points;

[0007] When any segment point in the physical model receives a fault simulation action, the segment point is identified as a fault segment point, and the operating status of the line segment where the fault segment point is located is detected for fault.

[0008] If the operating state is a fault state, the target segment point with priority action is determined among the segment points based on the differential protection mechanism, and a tripping command is sent to the target segment point. After the tripping command is issued, the reclosing delay mechanism is triggered to determine the fault type of the line segment where the fault segment point is located.

[0009] If the fault type is a permanent fault, the load will be transferred through the contact switch at the contact point.

[0010] In one embodiment, the construction of the physical model of the power distribution line includes:

[0011] Determine the power distribution line topology, including segmentation points and connection points;

[0012] In the power distribution line topology, a low-voltage DC power supply is used to simulate the electrical characteristics of a high-voltage AC line, and the voltage of the low-voltage DC power supply is distributed to each line in the power distribution line topology through a preset voltage divider circuit.

[0013] Relays and indicator lights are deployed at each segment point. The relays are used to simulate the opening and closing actions of high-voltage circuit breakers, and the indicator lights are used to simulate the energized state of the line.

[0014] The topology of the power distribution lines, which has been deployed and simulated, is determined as the physical model of the power distribution lines.

[0015] In one embodiment, the fault detection of the operating status of the line section where the fault segment point is located includes:

[0016] Obtain the current value at the fault segment point after receiving the fault simulation action;

[0017] Determine the peak current of the section where the fault segment point is located, and use the product of the peak current and a preset safety factor as the detection threshold;

[0018] If the current value exceeds the detection threshold, the line section where the fault segment point is located is considered to be in a fault state; otherwise, the line section where the fault segment point is located is considered to be in a normal state.

[0019] In one embodiment, the step of determining the target segment point with priority action among the various segment points based on the differential protection mechanism, and sending a trip command to the target segment point, includes:

[0020] Based on the location of the fault segment point, determine the time difference of other segment points, and select the segment point with the smallest time difference as the target segment point for priority action.

[0021] A tripping command is generated and sent to the target segment point to achieve fault isolation.

[0022] In one embodiment, the step of triggering a reclosing delay mechanism after the tripping command is issued to determine the fault type of the line section where the fault segment is located includes:

[0023] When the target segment point receives the tripping command, a timer is started. If the timer reaches the expected delay, a closing command is sent to the target segment point.

[0024] The operating status of the line section where the fault segment point is located is checked again. If the operating status is a fault status, a trip command is issued to the target segment point, and the fault type of the line section where the fault segment point is located is determined to be a permanent fault.

[0025] If the operating status is normal, then the fault type of the line segment where the fault segment point is located is determined to be a non-permanent fault.

[0026] In one embodiment, the load transfer via the contact switch at the contact point includes:

[0027] Based on the line section where the fault segment point is located, determine the non-fault section on the distribution line where the fault segment point is located;

[0028] In the physical model, identify the connection points that intersect with the non-faulty section, and select the target connection point from the identified connection points;

[0029] A closing command is sent to the target contact point to transfer the load and restore power supply to the non-faulty section.

[0030] In one embodiment, the method further includes:

[0031] Extend the fault detection time and the expected delay in the reclosing delay mechanism to realize a slow-motion display of the fault self-healing process in the physical model;

[0032] In addition, it records the changes in power distribution line parameters, the opening and closing status of each segment point, and the switching status of each interconnection point after receiving a simulated fault, generating self-healing log data.

[0033] Secondly, this application provides a power distribution line fault self-healing simulation device, the device comprising:

[0034] The model building module is used to build a physical model of the power distribution line, which includes multiple power distribution lines, as well as multiple segment points and connection points;

[0035] The fault detection module is used to identify any segment point in the physical model as a fault segment point when it receives a fault simulation action, and to detect the fault in the operating status of the line segment where the fault segment point is located.

[0036] The tripping and closing operation module is used to determine the target segment point with priority action based on the differential protection mechanism when the operating state is a fault state, and send a tripping command to the target segment point. After the tripping command is issued, a reclosing delay mechanism is triggered to determine the fault type of the line segment where the fault segment point is located.

[0037] The load transfer module is used to transfer the load through the contact switch at the contact point if the fault type is a permanent fault.

[0038] Thirdly, this application provides a storage medium storing computer-readable instructions that, when executed by one or more processors, cause the one or more processors to perform the steps of the power distribution line fault self-healing simulation method as described in any of the above embodiments.

[0039] Fourthly, this application provides a computer device, including: one or more processors, and a memory;

[0040] The memory stores computer-readable instructions, and when the one or more processors execute the computer-readable instructions, they perform the steps of the power distribution line fault self-healing simulation method as described in any of the above embodiments.

[0041] As can be seen from the above technical solutions, the embodiments of this application have the following advantages:

[0042] The self-healing simulation method, device, medium, and equipment for power distribution lines provided in this application construct a physical model of the power distribution line. When any segment point in the physical model receives a fault simulation action, the operating status of the line section where the fault segment point is located is detected. If the operating status is a fault state, a target segment point with priority action is determined among the various segment points based on the differential protection mechanism, and a tripping command is sent to the target segment point. Then, after the tripping command is issued, a reclosing delay mechanism is triggered to determine the fault type of the line section where the fault segment point is located. If the fault type is a permanent fault, the load is transferred through the tie switch at the tie point. In the above process, through the accurate simulation of segment points and tie points in the physical model, this solution can intuitively display the complete control chain from fault occurrence, differential protection action, target segment point tripping to reclosing delay, enabling relevant personnel to clearly understand the equipment status and logical connections of each link. Meanwhile, by using physical models to simulate permanent faults and reproduce the load transfer process, the self-healing control strategy can be fully verified without the risk of high-voltage electric shock or equipment damage, thus reducing experimental costs and operational risks. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1A flowchart illustrating a power distribution line fault self-healing simulation method provided in an embodiment of this application;

[0045] Figure 2 This is a schematic diagram of the structure of a power distribution line fault self-healing simulation device provided in an embodiment of this application;

[0046] Figure 3 This is an internal structural diagram of a computer device provided in an embodiment of this application. Detailed Implementation

[0047] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] In one embodiment, this application provides a method for simulating self-healing faults in power distribution lines. The following embodiments illustrate the application of this method to a self-healing simulation system for power distribution line faults, which can use a microcontroller as the processor. Figure 1 As shown, the method includes:

[0049] S101: Construct a physical model of the power distribution line.

[0050] The physical model is an abstract representation of the actual power distribution network. It simulates the network's topology and operating status by defining components such as lines, segmentation points, and tie points. The physical model includes multiple power distribution lines, as well as multiple segmentation points and tie points. A segmentation point is a switching device installed within a power distribution line to divide a long line into several independent sections. A tie point is a node connecting two different power distribution lines and is equipped with a tie switch.

[0051] In this step, when the user's simulation command is received, the structure of the power distribution network to be simulated for self-healing can be sorted out, the individual power distribution lines and their connections can be identified, segmentation points can be set in each power distribution line, and connection points can be set at the connection points of each power distribution line. The physical model of the power distribution line can be established based on the above information.

[0052] Specifically, when setting segmentation points in each power distribution line, a fixed distance can be used, or the setting can be determined according to the requirements of different fault scenarios. This application does not impose specific restrictions on this.

[0053] S102: When any segment point in the physical model receives a fault simulation action, the segment point is identified as a fault segment point, and the operating status of the line segment where the fault segment point is located is detected for fault.

[0054] Specifically, each segment point is equipped with an indicator light group and a jumper slot. This jumper slot connects to a variable resistor network to simulate a single-phase-to-ground short circuit. The adjustment range of the resistance value in the variable resistor network can be determined through short-circuit current experiments. Therefore, when a fault signal is connected to the jumper slot at any segment point in the physical model, i.e., a fault simulation action is received, the segment point receiving the fault simulation action is designated as the fault segment point, and the operating status of the line segment located at the fault segment point is detected. Furthermore, the indicator light group at the segment point can use different colors, different flashover frequencies, or a combination of both to indicate the line's energized state, operating status, switching actions, fault isolation, and other conditions.

[0055] It is understandable that when detecting the operational status of a line segment, the line parameters after the faulty segment receives a fault simulation action can be obtained. Then, by analyzing the line parameters, the operational status of the line segment can be determined. The operational status includes fault status and normal status.

[0056] S103: If the operating status is a fault state, the target segment point with priority action is determined among the segment points based on the differential protection mechanism, and a tripping command is sent to the target segment point. After the tripping command is issued, the reclosing delay mechanism is triggered to determine the fault type of the line segment where the fault segment point is located.

[0057] The differential protection mechanism is a protection strategy based on differences in time or current settings. It is used to ensure that, when a line fault occurs, the protection device closest to the fault point operates first, cutting off the power supply to the faulty section. The reclosing delay mechanism refers to the process of automatically attempting to reclose the circuit breaker after a preset time delay following its tripping. Its purpose is to restore power supply reliability in cases where a momentary fault (such as lightning strikes or tree branches touching a wire) causes a short circuit, and the fault may have already disappeared.

[0058] In this step, when a fault signal, such as an overcurrent or short-circuit signal, is detected, the protection device is triggered. According to the tiered protection mechanism, the section closest to the fault point will act first, issuing a trip command to cut off the power supply to the faulty section. This ensures that the fault can be quickly isolated, reducing the impact on the entire power grid. After the trip command is issued, a reclosing delay mechanism is triggered. This mechanism can determine the fault type, distinguishing between transient and permanent faults. If the fault is transient, such as a short circuit caused by lightning, the fault may disappear on its own after tripping. In this case, after a preset delay, an attempt will be made to reclose the circuit and restore power supply. If the reclosing is successful and the line returns to normal operation, it indicates that the fault was transient. If a fault signal is detected again after reclosing, it indicates that the fault is permanent. In this case, the circuit will trip again and lock to prevent equipment damage.

[0059] S104: If the fault type is a permanent fault, the load will be transferred through the contact switch at the contact point.

[0060] In this step, when the fault type is a permanent fault, the load can be transferred through the tie switch installed at the tie point to restore power to the faulty section. Specifically, the tie point is equipped with a tie switch, which is a switch that is normally in the open state.

[0061] Understandably, the method provided in this application can be applied in training scenarios. On the one hand, it can ensure the safety of trainees and reduce equipment costs. On the other hand, by intuitively demonstrating the complete control chain from fault occurrence, differential protection action, target segment point tripping to reclosing delay, trainees can also clearly understand the equipment status and logical connections of each link.

[0062] In the above embodiments, a physical model of the power distribution line is constructed. When any segment point in the physical model receives a fault simulation action, the operating status of the line section where the fault segment point is located is detected. If the operating status is a fault state, a target segment point with priority action is determined among the various segment points based on the differential protection mechanism, and a tripping command is sent to the target segment point. Then, after the tripping command is issued, a reclosing delay mechanism is triggered to determine the fault type of the line section where the fault segment point is located. If the fault type is a permanent fault, the load is transferred through the tie switch at the tie point. In the above process, through the accurate simulation of segment points and tie points in the physical model, this scheme can intuitively demonstrate the complete control chain from fault occurrence, differential protection action, target segment point tripping to reclosing delay, enabling relevant personnel to clearly understand the equipment status and logical connections of each link. At the same time, by using the physical model to simulate permanent faults and reproduce the load transfer process, the self-healing control strategy can be fully verified without the risk of high-voltage electric shock or equipment damage, reducing experimental costs and operational risks.

[0063] In one embodiment, constructing a physical model of the power distribution line includes:

[0064] S1: Determine the power distribution line topology, including segmentation points and connection points.

[0065] S2: In the power distribution line topology, a low-voltage DC power supply is used to simulate the electrical characteristics of a high-voltage AC line, and the voltage of the low-voltage DC power supply is distributed to each line in the power distribution line topology through a preset voltage divider circuit.

[0066] S3: Deploy relays and indicator light groups at each segment point.

[0067] S4: Determine the topology of the power distribution lines after deployment and simulation as the physical model of the power distribution lines.

[0068] Among them, relays are used to simulate the opening and closing actions of high-voltage circuit breakers, and indicator lights are used to simulate the energized state of the line. Electrical characteristics refer to the electrical parameters and characteristics exhibited by the power distribution line during operation, and voltage divider circuits are used to distribute the voltage of the low-voltage DC power supply to various line sections.

[0069] In this embodiment, geographical information and electrical parameters of the power line can be collected. Based on this information, each node in the line can be identified to clarify the topology of the power distribution line. A topology map of the line can be drawn using simulation tools. Then, multiple segment points and multiple tie points can be deployed on this topology map to obtain the power distribution line topology. Next, to simulate the electrical characteristics of high-voltage AC lines, a low-voltage DC power supply is used. By designing a voltage divider circuit, the voltage of the low-voltage DC power supply is distributed to each line segment. Then, relays and indicator lights are deployed at each segment point to realize fault detection and status indication. Relays are used to control the on / off of the line. When a fault is detected, the faulty section can be quickly disconnected to protect equipment and personnel safety. Indicator lights are used to visually display the status of the line, such as normal operation, fault alarm, etc., to facilitate maintenance personnel to quickly locate the problem. Finally, the power distribution line topology structure that has been simulated and deployed as described above is determined as a physical model.

[0070] The design of a voltage divider circuit needs to ensure that the voltage distribution of each line segment conforms to the actual voltage distribution of a high-voltage line. Specifically, the resistance range of the voltage divider resistor can be determined experimentally based on the relationship between the output voltage of the low-voltage DC power supply and the equivalent impedance of the target line segment. This experiment can measure the voltage fluctuation of the line segment under different load currents, and adjust the voltage divider resistor value until the voltage fluctuation amplitude stabilizes within the preset range.

[0071] In one embodiment, fault detection is performed on the operating status of the line segment where the fault segment point is located, including:

[0072] S1: Obtain the current value at the fault segment point after receiving the fault simulation action.

[0073] S2: Determine the peak current of the section where the fault segment is located, and use the product of the peak current and the preset safety factor as the detection threshold.

[0074] S3: If the current value exceeds the detection threshold, the line section where the fault segment point is located is considered to be in a fault state; otherwise, the line section where the fault segment point is located is considered to be in a normal state.

[0075] The preset safety factor is an empirical value and can be set or adjusted according to actual needs.

[0076] In this embodiment, when a short-circuit fault of different impedance is applied to a segment point, the current value of the faulty segment point after receiving the fault simulation action can be obtained. Then, the peak current of the segment where the faulty segment point is located is multiplied by a preset safety factor to obtain a detection threshold. Subsequently, if the current value exceeds the detection threshold, it indicates that the line segment where the faulty segment point is located is in a fault state; if the current value does not exceed the detection threshold, it indicates that the line segment where the faulty segment point is located is in a normal state. In this process, the detection threshold can dynamically change according to different line segments, thereby ensuring the accuracy and reliability of fault detection.

[0077] In one embodiment, based on the differential protection mechanism, a target segment point with priority action is determined among the various segment points, and a tripping command is sent to the target segment point, including:

[0078] S1: Determine the time difference of other segment points based on the location of the fault segment point, and select the segment point with the smallest time difference as the target segment for priority action.

[0079] S2: Generate a trip command and send the trip command to the target segment point to achieve fault isolation.

[0080] In this embodiment, the relative positional relationship between the fault segment point and other segment points is determined based on the location of the fault segment point (the location where the fault occurs) and the line topology. Based on these positional relationships, the time difference between each segment point is calculated, i.e., the operating time difference of the protection device. The time difference is typically set according to the principle of "the closer to the fault point, the shorter the operating time" to ensure that the fault can be quickly isolated. Once the target segment point is determined, a tripping command is generated, which can be sent to the protection device at the target segment point via the communication network. Upon receiving the command, the protection device immediately performs a tripping operation, cutting off the power supply to the faulty segment, thereby quickly isolating the faulty segment.

[0081] For example, suppose there are three segment points A, B, and C in the line, and the fault occurs between B and C. Segment point A is farther from the fault point, and its protection device's operating time may be set to 0.5 seconds; segment point B is closer to the fault point, and its protection device's operating time is set to 0.2 seconds; the operating time of segment point C is also short, say 0.3 seconds. By comparing these operating times, it can be determined that segment point B has the smallest time difference, therefore B is selected as the target segment point for priority action.

[0082] In one embodiment, a reclosing delay mechanism is triggered after the tripping command is issued to determine the fault type of the line section where the fault segment is located, including:

[0083] S1: When the target segment point receives the tripping command, start timing. If the timing reaches the expected delay, send a closing command to the target segment point.

[0084] S2: Check the operating status of the line section where the fault segment is located again. If the operating status is a fault status, send a trip command to the target segment and determine that the fault type of the line section where the fault segment is located is a permanent fault.

[0085] S3: If the operating status is normal, then the fault type of the line section where the fault segment point is located is determined to be a non-permanent fault.

[0086] The expected delay can be adjusted according to the actual situation. On the one hand, it can eliminate non-permanent faults, and on the other hand, it can slow down the opening and closing actions so that slow-motion demonstrations can be performed during training.

[0087] In this embodiment, when the target segment receives a tripping command, it performs a tripping operation, cutting off the power supply to the line segment where the faulty segment is located. At this time, a timer is started. The expected delay of the timer is determined based on a pre-set reclosing delay parameter, which is typically optimized according to the characteristics of the line and the type of fault. If the timer reaches the expected delay, a closing command is automatically sent to the target segment to attempt to restore power. After the closing command is issued, the operating status of the line segment where the faulty segment is located is checked again to determine whether the fault has been eliminated, thereby identifying the fault type. This mechanism effectively improves power supply reliability, reduces unnecessary power outages, protects equipment and personnel safety, and enhances the stability and reliability of the power grid.

[0088] In one embodiment, load transfer is performed via a contact switch at a contact point, including:

[0089] S1: Determine the non-faulty section of the distribution line where the fault segment point is located based on the line section where the fault segment point is located.

[0090] S2: In the physical model, identify the connection points that intersect with the non-faulty sections, and select the target connection point from the identified connection points.

[0091] S3: Send a closing command to the target contact point to transfer the load and restore power supply to the non-faulty section.

[0092] In this embodiment, based on the line segment where the fault sectionalizing point is located, non-faulty sections of the line unaffected by the fault are determined. Next, connection points that intersect with these non-faulty sections are located in the physical model. These connection points are key nodes connecting different feeders and can be used to transfer loads. Finally, a target connection point is selected from these connection points, and a closing command is sent to it. By adjusting the connection switch at the connection point, the load of the non-faulty section is transferred to other normally operating feeders, restoring power supply to the non-faulty section.

[0093] Specifically, when selecting a target connection point, the choice can be based on its electrical parameters and operating status. For example, connection points with larger rated current capacity and lower current load rates are preferred to ensure that the connection point and its connected feeders are not overloaded after power transfer. Alternatively, the selection can be based on the connection point's topological location and the complexity of the power transfer path. Typically, the connection point closest to the non-faulty section is selected to reduce voltage drop and line losses along the power transfer path. A combination of the two methods mentioned above can also be used for selection; this application does not impose specific limitations on this.

[0094] Understandably, by quickly identifying non-faulty sections and selecting appropriate target tie points for load transfer, power supply to these sections can be restored in a short time, reducing power outage time for users. Furthermore, appropriate tie point selection can optimize power flow distribution in the power grid and reduce line losses.

[0095] In one embodiment, the power distribution line fault self-healing simulation method further includes:

[0096] S1: Extend the fault detection time and the expected delay in the reclosing delay mechanism to realize a slow-motion display of the fault self-healing process in the physical model.

[0097] S2: Record the changes in power distribution line parameters, the opening and closing status of each segment point, and the switching status of each interconnection point after receiving a simulated fault, and generate self-healing log data.

[0098] In this embodiment, on the one hand, the fault detection time and the expected delay in the reclosing delay mechanism can be extended. The baseline value for this extension can be set as the statistical average of the actual self-healing action time recorded by the high-speed waveform recording equipment. The specific extension factor can be set according to training requirements. On the other hand, various information received after a simulated fault is recorded, generating self-healing log data for maintenance personnel to compare and reference, and also serving as data for updating the detection threshold and extension factor.

[0099] Specifically, to enable trainees to clearly identify the actions at each stage, the time parameter in the fault recovery process needs to be extended. This involves slowing down the fault recovery actions by adjusting the multiplier of the time parameter. This multiplier is determined by experimental results, and trainees gradually increase the multiplier until they can clearly observe each fault recovery action. The specific multiplier can be 1x, 2x, 5x, or even higher, depending on the trainees' observation needs and the teaching objectives.

[0100] In some embodiments, a fault generation box can also be provided, which integrates multiple physical switches. Each switch controls a specific short-circuit combination, such as AB phase, BC phase, AC phase short circuit, or three-phase short circuit. The switches are mechanical or electronic, facilitating manual operation or remote triggering by trainees. After each switch is triggered, it sends an coded fault signal to the system's processing center. The coding rules are predefined based on the short-circuit type; for example, 01 represents an AB phase short circuit, 10 represents a BC phase short circuit, etc. Upon receiving the signal, the system's processing center will report the currently occurring fault type to the main control system or display terminal via a serial port or I / O interface, facilitating monitoring, recording, and evaluation of the response by staff.

[0101] In some embodiments, the power distribution line fault self-healing simulation method further includes: demonstrating the simulated self-healing process in stages. Specifically, it is divided into the following three stages:

[0102] Fault detection phase: After the microcontroller (the system's processing center) detects that the current exceeds the threshold, it controls the red LED (indicator light group) to flash at a preset frequency and outputs a timing start signal;

[0103] Isolation phase: After the relay trips, the yellow LED (indicator light group) switches to a constantly lit state, and the microcontroller outputs an isolation completion signal;

[0104] Recovery phase: After the interconnecting switch is closed, the green LED (indicator light group) stays on, the microcontroller outputs the timing end signal and records the total action time.

[0105] In some embodiments, users can modify the current protection settings, reclosing circuit parameters, and fault detection sensitivity parameters in the microcontroller via external input devices. The modified control parameters are stored in non-volatile memory in real time. After each parameter adjustment, the fault needs to be retried. The correctness of the protection circuit is verified by comparing the timing relationship between the LED group status and the timing signal. If the expected result is not achieved, the control parameters are iteratively adjusted. Furthermore, multiple typical fault scenario circuits can be pre-stored in the microcontroller, including single-point permanent short circuits and multi-point intermittent short circuits. The scenario number can then be selected via a hardware switch, and the microcontroller calls the corresponding fault parameters and protection circuit configuration based on the number.

[0106] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0107] The following describes the power distribution line fault self-healing simulation device provided in the embodiments of this application. The power distribution line fault self-healing simulation device described below and the power distribution line fault self-healing simulation method described above can be referred to in correspondence.

[0108] like Figure 2 As shown, this application provides a power distribution line fault self-healing simulation device 200, the device comprising:

[0109] Model building module 201 is used to build a physical model of the power distribution line, which includes multiple power distribution lines, as well as multiple segment points and connection points;

[0110] The fault detection module 202 is used to determine the segment point as a fault segment point when any segment point in the physical model receives a fault simulation action, and to detect the fault in the operating status of the line segment where the fault segment point is located.

[0111] The tripping and closing operation module 203 is used to determine the target segment point with priority action among each segment point based on the differential protection mechanism if the operating state is a fault state, and send a tripping command to the target segment point. After the tripping command is issued, the reclosing delay mechanism is triggered to determine the fault type of the line segment where the fault segment point is located.

[0112] The load transfer module 204 is used to transfer the load through the contact switch at the contact point if the fault type is a permanent fault.

[0113] In the above embodiments, a physical model of the power distribution line is constructed. When any segment point in the physical model receives a fault simulation action, the operating status of the line section where the fault segment point is located is detected. If the operating status is a fault state, a target segment point with priority action is determined among the various segment points based on the differential protection mechanism, and a tripping command is sent to the target segment point. Then, after the tripping command is issued, a reclosing delay mechanism is triggered to determine the fault type of the line section where the fault segment point is located. If the fault type is a permanent fault, the load is transferred through the tie switch at the tie point. In the above process, through the accurate simulation of segment points and tie points in the physical model, this scheme can intuitively demonstrate the complete control chain from fault occurrence, differential protection action, target segment point tripping to reclosing delay, enabling relevant personnel to clearly understand the equipment status and logical connections of each link. At the same time, by using the physical model to simulate permanent faults and reproduce the load transfer process, the self-healing control strategy can be fully verified without the risk of high-voltage electric shock or equipment damage, reducing experimental costs and operational risks.

[0114] In one embodiment, the model building module includes:

[0115] The structure determination submodule is used to determine the power distribution line topology, including segmentation points and connection points.

[0116] The voltage distribution submodule is used to simulate the electrical characteristics of high-voltage AC lines in the power distribution line topology using low-voltage DC power supply, and distributes the voltage of the low-voltage DC power supply to each line in the power distribution line topology through a preset voltage divider circuit.

[0117] The device deployment submodule is used to deploy relays and indicator lights at each segment point. The relays are used to simulate the opening and closing actions of the high-voltage circuit breaker, and the indicator lights are used to simulate the energized state of the line.

[0118] The model determination submodule is used to determine the power distribution line topology, which has been deployed and simulated, as the physical model of the power distribution line.

[0119] In one embodiment, the fault detection module includes:

[0120] The current acquisition submodule is used to acquire the current value at the fault segment point after receiving a fault simulation action;

[0121] The threshold determination submodule is used to determine the peak current of the section where the fault segment point is located, and to use the product of the peak current and the preset safety factor as the detection threshold.

[0122] The status judgment submodule is used to determine whether the line segment where the fault segment point is located is in a fault state if the current value exceeds the detection threshold, and otherwise consider the line segment where the fault segment point is located to be in a normal state.

[0123] In one embodiment, the opening and closing operation module includes:

[0124] The segment point determination submodule is used to determine the time difference of other segment points based on the location of the faulty segment point, and select the segment point with the smallest time difference as the target segment point for priority action.

[0125] The instruction generation submodule is used to generate tripping instructions and send them to the target segmentation point to achieve fault isolation.

[0126] In one embodiment, the opening and closing operation module includes:

[0127] The instruction issuing submodule is used to start timing when the target segment point receives the tripping instruction. If the timing time reaches the expected delay, a closing instruction is issued to the target segment point.

[0128] The first determination submodule is used to re-detect the operating status of the line section where the fault segment point is located. If the operating status is a fault status, a trip command is sent to the target segment point, and the fault type of the line section where the fault segment point is located is determined to be a permanent fault.

[0129] The second determination submodule is used to determine that the fault type of the line segment where the fault segment point is located is a non-permanent fault if the operating state is normal.

[0130] In one embodiment, the load transfer module includes:

[0131] The section determination submodule is used to determine the non-faulty section on the distribution line where the fault section point is located, based on the line section where the fault section point is located.

[0132] The connection point determination submodule is used to determine the connection points that intersect with non-faulty sections in the physical model, and select the target connection point from the determined connection points.

[0133] The load transfer submodule is used to send a closing command to the target contact point to transfer the load and restore power supply to the non-faulty section.

[0134] In one embodiment, the power distribution line fault self-healing simulation device further includes:

[0135] The time extension module is used to extend the fault detection time and the expected delay in the reclosing delay mechanism, and to realize the slow-motion display of the fault self-healing process in the physical model.

[0136] The log generation module is used to record the changes in power distribution line parameters, the opening and closing status of each segment point, and the switching status of each interconnection point after receiving a simulated fault, and to generate self-healing log data.

[0137] The division of modules in the above-described power distribution line fault self-healing simulation device is merely illustrative. In other embodiments, the power distribution line fault self-healing simulation device can be divided into different modules as needed to complete all or part of its functions. Each module in the above-described power distribution line fault self-healing simulation device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module.

[0138] In one embodiment, this application also provides a storage medium storing computer-readable instructions that, when executed by one or more processors, cause the one or more processors to perform the steps of the power distribution line fault self-healing simulation method as described in any of the above embodiments.

[0139] In one embodiment, this application also provides a computer device storing computer-readable instructions that, when executed by one or more processors, cause the one or more processors to perform the steps of the power distribution line fault self-healing simulation method as described in any of the above embodiments.

[0140] Indicatively, such as Figure 3 As shown, Figure 3 This is a schematic diagram of the internal structure of a computer device 300 provided in an embodiment of this application. The computer device 300 can be provided as a server. (Refer to...) Figure 3 The computer device 300 includes a processing component 302, which further includes one or more processors, and memory resources represented by memory 301 for storing instructions, such as application programs, that can be executed by the processing component 302. The application programs stored in memory 301 may include one or more modules, each corresponding to a set of instructions. Furthermore, the processing component 302 is configured to execute instructions to perform the power distribution line fault self-healing simulation method of any of the above embodiments.

[0141] The computer device 300 may also include a power supply component 303 configured to perform power management of the computer device 300, a wired or wireless network interface 304 configured to connect the computer device 300 to a network, and an input / output (I / O) interface 305. The computer device 300 may operate on an operating system stored in memory 301, such as Windows Server™, Mac OS X™, Unix™, Linux™, Free BSD™, or similar.

[0142] Those skilled in the art will understand that Figure 3 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0143] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a…" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. In this document, the singular forms "a," "an," and "the" may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having” specify the presence of the stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0144] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The various embodiments can be combined as needed, and the same or similar parts can be referred to each other.

[0145] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for simulating self-healing of power distribution line faults, comprising: The method comprises: constructing a physical model of the power distribution circuit, the physical model comprising a plurality of power distribution circuits and a plurality of section points and tie points; when any section point in the physical model receives a fault simulation action, determining the section point as a fault section point, and detecting the operating state of the circuit section in which the fault section point is located; if the operating state is a fault state, determining a target section point for priority action among the section points based on a differential protection mechanism, and sending an opening command to the target section point, triggering a reclosing delay mechanism after the opening command is issued to determine the fault type of the circuit section in which the fault section point is located; if the fault type is a permanent fault, performing load transfer through the tie switch of the tie point.

2. The power distribution line fault self-healing simulation method of claim 1, wherein, The construction of the physical model of the power distribution circuit comprises: determining the topology of the power distribution circuit comprising section points and tie points; using a low-voltage direct-current power supply to simulate the electrical characteristics of a high-voltage alternating-current circuit in the power distribution circuit topology, and distributing the voltage of the low-voltage direct-current power supply to each circuit in the power distribution circuit topology through a pre-set voltage dividing circuit; deploying relays and prompt light groups at each section point, the relays being used to simulate the opening and closing actions of a high-voltage circuit breaker, and the prompt light groups being used to simulate the live state of the circuit; determining the power distribution circuit topology after deployment simulation as the physical model of the power distribution circuit.

3. The power distribution line fault self-healing simulation method of claim 1, wherein, The fault detection of the operating state of the circuit section in which the fault section point is located comprises: obtaining the current value of the fault section point after receiving the fault simulation action; determining the current peak value of the section in which the fault section point is located, and taking the product of the current peak value and a pre-set safety factor as a detection threshold; if the current value exceeds the detection threshold, considering that the operating state of the circuit section in which the fault section point is located is a fault state, otherwise, considering that the operating state of the circuit section in which the fault section point is located is a normal state.

4. The power distribution line fault self-healing simulation method of claim 1, wherein, The determination of the target section point for priority action among the section points based on the differential protection mechanism, and the sending of an opening command to the target section point, comprise: determining the time differential of other section points according to the position of the fault section point, and selecting the section point with the smallest time differential as the target section point for priority action; generating an opening command and sending the opening command to the target section point to achieve fault isolation.

5. The power distribution line fault self-healing simulation method of claim 1, wherein, The triggering of the reclosing delay mechanism after the opening command is issued to determine the fault type of the circuit section in which the fault section point is located, comprises: when the target section point receives the opening command, starting the timer, if the timer time reaches the expected delay, sending a closing command to the target section point; detecting the operating state of the circuit section in which the fault section point is located again, if the operating state is a fault state, sending an opening command to the target section point, and determining that the fault type of the circuit section in which the fault section point is located is a permanent fault; if the operating state is a normal state, determining that the fault type of the circuit section in which the fault section point is located is a non-permanent fault.

6. The power distribution line fault self-healing simulation method of claim 1, wherein, The load transfer through the tie switch of the tie point comprises: determine a non-fault section on the power distribution line according to a section of the line where the fault section point is located; determine a tie-in point having an intersection with the non-fault section in the physical model, and select a target tie-in point from the determined tie-in points; send a closing instruction to the target tie-in point to perform load transfer, and restore power supply of the non-fault section.

7. The power distribution line fault self-healing simulation method according to any one of claims 1 to 6, characterized in that, The method further comprises: prolong a time of fault detection and an expected delay in the reclosing delay mechanism, and perform slow-motion display of a fault self-healing process in the physical model; record changes in parameters of the power distribution line, opening and closing states of each section point, and switch states of each tie-in point after receiving the simulated fault, and generate self-healing log data.

8. An electric power distribution line fault self-healing simulation apparatus, characterized by, The device comprises: a model construction module configured to construct a physical model of a power distribution line, the physical model comprising a plurality of power distribution lines and a plurality of section points and tie-in points; a fault detection module configured to determine a fault section point when any section point in the physical model receives a fault simulation action, and perform fault detection on an operating state of a section of the line where the fault section point is located; an opening and closing operation module configured to determine a target section point of a preferential action among the section points based on a differential protection mechanism if the operating state is a fault state, and send an opening instruction to the target section point, and trigger a reclosing delay mechanism after the opening instruction is sent to determine a fault type of the section of the line where the fault section point is located; a load transfer module configured to perform load transfer through a tie-in switch of a tie-in point if the fault type is a permanent fault.

9. A storage medium characterized by: The storage medium stores computer readable instructions, which, when executed by one or more processors, cause the one or more processors to perform the steps of the power distribution line fault self-healing simulation method according to any one of claims 1 to 7.

10. A computer device, comprising: comprise: one or more processors, and a memory; the memory stores computer readable instructions, which, when executed by the one or more processors, perform the steps of the power distribution line fault self-healing simulation method according to any one of claims 1 to 7.

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