A split-ring communication method, system, device and medium for realizing high-voltage switch secondary circuit control flow isolation

Abstract

The application relates to the technical field of data transmission, and discloses a split-ring communication method, system, equipment and medium for realizing control flow isolation of a secondary loop of a high-voltage switch, which comprises the following steps: collecting real-time ground potential transient data of multiple grounding points of a high-voltage switch substation, recording initial communication parameters of a secondary loop system in the substation, and performing communication ring network topology division processing; synchronously performing ground potential common-mode interference analysis and ring network communication quality evaluation on the secondary loop system according to a preset interference detection period, and outputting interference analysis results and communication quality evaluation results of the system in real time; comprehensively judging the communication reliability of the secondary loop system based on the interference analysis results and the communication quality evaluation results, and executing corresponding communication route reconstruction and isolation protection strategies according to the judgment results. The application solves the problems of response delay or misjudgment of hidden common-mode interference in the prior art, and provides all-round protection for the safe and stable operation of the secondary loop of the high-voltage switch under extreme working conditions.

Description

Technical Field

[0001] This invention relates to the field of data transmission technology, and in particular to a loop communication method, system, device, and medium for achieving flow isolation in the secondary circuit control of high-voltage switches. Background Technology

[0002] In high-voltage switchgear secondary circuit control and communication systems, traditional solutions generally employ a point-to-point linear connection architecture. While traditional solutions can maintain basic functionality in plains areas, they face severe challenges in geologically complex substations such as those in mountainous or mining areas. This is especially true for intelligent high-voltage switchgear, which utilizes a ring network topology, including a dual-protection ring network composed of an intelligent acquisition and execution unit and a circuit breaker control module, as well as a logic control ring network composed of a comprehensive control and analysis unit and a disconnector control module.

[0003] Existing technologies utilize ring network redundancy to improve system reliability. However, drastic fluctuations in ground potential caused by transient events such as lightning strikes and short circuits can generate dynamic potential differences of hundreds of volts between different grounding points, forming strong common-mode interference signals. These common-mode interference signals intrude into the system through coupling paths between ring networks, causing all three ring networks to be contaminated simultaneously. Furthermore, existing technologies only monitor transient changes in ground potential at individual nodes and cannot perceive the real-time distribution of the grounding network potential across the entire station. It is difficult to accurately locate the interference source and propagation path within a ring network architecture. For example, when a ring network is subjected to a ground potential surge, the interference can rapidly spread to other ring networks through shared physical resources and communication links, causing systemic communication paralysis.

[0004] Furthermore, existing protection devices often fail when faced with common-mode interference unique to ring network architectures due to the lack of cross-ring network coordination mechanisms. This failure leads to the loss of isolation protection functions and can also cause cascading failures due to logical coupling between ring networks. Therefore, there is currently a lack of solutions for analyzing the correlation between communication quality and transient ground potential characteristics in ring network architectures. This results in the communication reliability of secondary circuits under extreme operating conditions not being guaranteed, severely hindering the improvement of the intelligence level of high-voltage switchgear. Summary of the Invention

[0005] In view of the aforementioned existing problems, the present invention is proposed.

[0006] Therefore, the present invention provides a loop communication method, system, device and medium for isolating the control flow of the secondary circuit of a high-voltage switch, which solves the problem of delayed response or misjudgment of covert common-mode interference in the prior art.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0008] In a first aspect, the present invention provides a loop communication method for achieving flow isolation in the secondary circuit control of a high-voltage switch, comprising:

[0009] Real-time ground potential transient data of multiple grounding points in high-voltage switchgear substations are collected, and initial communication parameters and communication ring network topology are recorded for the secondary circuit system within the substation.

[0010] A preset interference detection cycle is set, and ground potential common-mode interference analysis and ring network communication quality assessment of the secondary circuit system are performed synchronously according to the interference detection cycle, and the interference analysis results and communication quality assessment results of the system are output in real time.

[0011] Based on the interference analysis results and communication quality assessment results, the communication reliability of the secondary loop system is comprehensively judged, and the corresponding communication route reconstruction and isolation protection strategies are executed according to the results of the comprehensive judgment.

[0012] As a preferred embodiment of the ring-loop communication method for isolating control flow in the secondary circuit of a high-voltage switchgear as described in this invention, the step of collecting real-time ground potential transient data from multiple grounding points in the high-voltage switchgear substation and performing initial communication parameter recording and communication ring network topology partitioning processing on the secondary circuit system within the substation includes:

[0013] According to the preset transient detection time interval, real-time ground potential transient data of multiple grounding points in the high-voltage switchgear substation are collected at equal intervals, including the instantaneous value of ground potential difference, the transient rate of change of grounding current and the grounding loop impedance.

[0014] Record the initial communication parameters of the secondary loop system;

[0015] Based on the physical topology of the secondary loop system, the secondary loop system is divided into M independent communication loop segments. Each communication loop segment contains a complete transmit-receive link, and the characteristic impedance of the loop segment is set as the basis for division.

[0016] As a preferred embodiment of the loop communication method for achieving flow isolation in the secondary circuit control of a high-voltage switch as described in this invention, the step of performing common-mode interference analysis on the ground potential of the secondary circuit system includes:

[0017] A high-frequency sensor array is arranged at the grounding node of the high-voltage switchgear substation to periodically collect multi-channel signal waveforms of the secondary circuit system according to the transient detection time interval, and to perform standardization and signal enhancement processing on the collected signal waveforms.

[0018] The processed signal waveform is subjected to local extremum extraction to obtain local extremum points. Then, the signal intensity of the local extremum points of all communication loop segments is extracted. The sampling points with the signal intensity greater than the intensity screening threshold are taken as the secondary loop interference centers of each conducted interference path.

[0019] Calculate the comprehensive interference index of the neighborhood surrounding the interference center of the secondary loop;

[0020] When the comprehensive interference index is greater than or equal to the set interference judgment threshold, the current sampling point is determined to belong to the interference area; when the comprehensive interference index is less than the set interference judgment threshold, the current sampling point is determined to belong to the normal area; the sampling points in the surrounding area are iteratively judged until the comprehensive interference index of the boundary points is less than the set interference judgment threshold.

[0021] Obtain the set of conducted interference paths for each communication loop segment of the secondary loop system, and record the equivalent interference range of each conducted interference path.

[0022] As a preferred embodiment of the loop communication method for achieving flow isolation in the secondary circuit control of a high-voltage switch as described in this invention, the step of performing common-mode interference analysis on the ground potential of the secondary circuit system further includes:

[0023] The secondary loop system is modeled as a three-dimensional impedance network model, with each network element representing an impedance analysis node.

[0024] Extract the propagation delay parameter of the test signal, calculate the propagation characteristic parameter of the test signal on the propagation path in the secondary loop system based on the propagation delay parameter, and iteratively adjust the impedance characteristic of each network unit based on the impedance distribution reconstruction algorithm to reconstruct the impedance distribution characteristic inside the secondary loop system.

[0025] Anomaly thresholds are used to identify abnormal paths in the impedance distribution within the reconstructed secondary loop system, and the spatial distribution of all continuous interference ranges is extracted through network topology connectivity analysis.

[0026] An interference impact range identification method is used to extract the impact range of all coupled interference paths, where each impact range corresponds to an interference domain. The parameters of each interference domain are recorded. All interference domains are traversed along the signal propagation path. The equivalent interference intensity of all interference domains is calculated through the interference impact assessment model, and the maximum equivalent interference intensity is taken as the interference degree assessment index representing the coupled interference path.

[0027] The first interference evaluation coefficient is calculated based on the equivalent interference range of each conducted interference path and the interference degree evaluation index of the coupled interference path.

[0028] As a preferred embodiment of the ring network communication method for achieving flow isolation in the secondary circuit control of high-voltage switches as described in this invention, the ring network communication quality assessment includes:

[0029] Using a wideband spectrum analyzer, dielectric spectrum scanning detection is performed on each communication loop segment of the secondary loop system to obtain dielectric loss characteristic data for each communication loop segment;

[0030] Based on the dielectric loss characteristic data of each communication loop segment, the second interference evaluation coefficient is calculated.

[0031] As a preferred embodiment of the loop communication method for isolating control flow in the secondary circuit of a high-voltage switch as described in this invention, the step of comprehensively judging the communication reliability of the secondary circuit system based on the interference analysis results and communication quality assessment results includes:

[0032] The first interference evaluation coefficient and the second interference evaluation coefficient are imported into the comprehensive communication interference evaluation strategy to obtain the comprehensive interference evaluation index.

[0033] If the overall interference assessment index of the current secondary circuit system is greater than or equal to the interference level threshold, the communication quality level of the current secondary circuit system is poor; if the overall interference assessment index of the current secondary circuit system is less than the interference level threshold, the communication quality level of the current secondary circuit system is good.

[0034] As a preferred embodiment of the loop communication method for implementing control flow isolation in the secondary circuit of a high-voltage switch as described in this invention, the step of executing the corresponding communication route reconstruction and isolation protection strategy based on the comprehensive judgment result includes:

[0035] When the communication quality level of the secondary loop system is poor, extract the set of conducted interference paths in each communication loop segment of the secondary loop system and calculate the first interference propagation direction coefficient of adjacent communication loop segments.

[0036] When the communication quality level of the secondary loop system is poor, extract the spectral characteristic data of each communication loop segment of the secondary loop system and calculate the second interference propagation direction coefficient of adjacent communication loop segments.

[0037] Based on the first interference propagation direction coefficient and the second interference propagation direction coefficient, the interference propagation direction of the secondary loop system is determined, and the corresponding communication route reconstruction and isolation protection strategy is executed according to the interference propagation direction.

[0038] Secondly, the present invention provides a loop communication system for isolating control flow in the secondary circuit of a high-voltage switch, comprising:

[0039] The preliminary processing module is used to collect real-time transient ground potential data from multiple grounding points in the high-voltage switchgear substation, and to perform initial communication parameter recording and communication ring network topology division processing for the secondary circuit system within the substation.

[0040] The analysis and evaluation module is used to preset the interference detection cycle, and synchronously perform ground potential common-mode interference analysis and ring network communication quality evaluation of the secondary circuit system according to the interference detection cycle, and output the interference analysis results and communication quality evaluation results of the system in real time.

[0041] The strategy determination module is used to make a comprehensive judgment on the communication reliability of the secondary loop system based on the interference analysis results and communication quality assessment results, and to execute the corresponding communication route reconstruction and isolation protection strategy according to the result of the comprehensive judgment.

[0042] Thirdly, the present invention provides an electronic device, including a memory and a processor; the memory is used to store computer-executable instructions, and the processor executes the computer-executable instructions to implement a step of a loop communication method for isolating the secondary circuit control flow of a high-voltage switch.

[0043] Fourthly, the present invention provides a computer-readable storage medium storing computer-executable instructions that, when executed by a processor, implement the steps of a loop communication method for isolating the control flow of a high-voltage switch secondary circuit.

[0044] Compared with existing technologies, the beneficial effects of this invention are as follows: By dividing the secondary loop system into multiple independent communication loop segments and establishing a ground potential-sensitive interference detection model, the system can sense the dynamic potential difference changes of different grounding points in real time, accurately identify common-mode interference paths caused by transient events such as lightning strikes and short circuits, and immediately activate a directional isolation mechanism when an abnormal ground potential is detected in a loop segment to confine the interference to the local loop segment, effectively preventing the interference from spreading through the ring network link, thereby significantly improving the anti-interference capability and operational stability of the secondary loop communication system. Based on impedance characteristic inversion and propagation delay analysis, this invention enables the system to dynamically reconstruct communication routes. When the communication quality of a certain loop segment deteriorates due to geological conditions, the system can automatically switch to a backup loop segment and reconfigure the signal transmission path. This adaptive reconstruction capability not only significantly improves the fault tolerance performance of the system but also ensures the continuous reliability of communication links in complex geological environments such as mountainous areas and mining areas. This invention achieves accurate judgment of interference propagation direction by integrating a dual evaluation mechanism of conducted interference and coupled interference. Combined with the coordinated control of grounding compensation device, impedance matching device and shielding protection device, a multi-level interference suppression system is formed. This system can dynamically adjust the suppression strategy according to the interference propagation characteristics, which not only effectively eliminates the isolation failure problem caused by transient differences in ground potential, but also optimizes the allocation of system resources, providing comprehensive protection for the safe and stable operation of the secondary circuit of high-voltage switch under extreme conditions. Attached Figure Description

[0045] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the overall flow logic of a loop communication method for implementing flow isolation in the secondary circuit control of a high-voltage switch, provided in an embodiment of the present invention. Detailed Implementation

[0047] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0048] Example 1, referring to Figure 1 As one embodiment of the present invention, a loop communication method for achieving flow isolation in the secondary circuit control of a high-voltage switch is provided, such as... Figure 1 The specific steps shown are as follows:

[0049] S100: Collects real-time transient ground potential data from multiple grounding points in high-voltage switchgear substations, and performs initial communication parameter recording and communication ring network topology division for the secondary circuit system within the substation.

[0050] S200: Preset interference detection cycle, synchronously perform ground potential common-mode interference analysis and ring network communication quality assessment of the secondary circuit system according to the interference detection cycle, and output the interference analysis results and communication quality assessment results of the system in real time;

[0051] S300: Based on the interference analysis results and communication quality assessment results, it makes a comprehensive judgment on the communication reliability of the secondary loop system, and executes the corresponding communication route reconstruction and isolation protection strategies according to the comprehensive judgment results.

[0052] It should be noted that, to address the issues of delayed or misjudged response to concealed common-mode interference in existing technologies, this invention divides the secondary loop system into multiple independent communication segments and establishes a ground potential-sensitive interference detection model. The system can sense dynamic potential difference changes at different grounding points in real time, accurately identifying common-mode interference paths caused by transient events such as lightning strikes and short circuits. When an abnormal ground potential is detected in a segment, the system can immediately activate a directional isolation mechanism to confine the interference to the local segment, effectively preventing interference from spreading through the ring network link, thereby significantly improving the anti-interference capability and operational stability of the secondary loop communication system. Based on impedance characteristic inversion and propagation delay analysis, this invention employs three-dimensional network modeling technology, enabling the system to dynamically reconstruct communication routes. When communication quality deteriorates in a segment due to worsening geological conditions, the system can automatically switch to a backup segment and reconfigure the signal transmission path. This adaptive reconstruction capability not only significantly improves the system's fault tolerance but also ensures the continuous reliability of communication links in complex geological environments such as mountainous and mining areas. This invention achieves accurate judgment of interference propagation direction by integrating a dual evaluation mechanism of conducted interference and coupled interference. Combined with the coordinated control of grounding compensation device, impedance matching device and shielding protection device, a multi-level interference suppression system is formed. This system can dynamically adjust the suppression strategy according to the interference propagation characteristics, which not only effectively eliminates the isolation failure problem caused by transient differences in ground potential, but also optimizes the allocation of system resources, providing comprehensive protection for the safe and stable operation of the secondary circuit of high-voltage switch under extreme conditions.

[0053] In this embodiment of the invention, step S100, which involves collecting real-time transient ground potential data from multiple grounding points in a high-voltage switchgear substation and performing initial communication parameter recording and communication ring network topology partitioning on the secondary circuit system within the substation, includes the following sub-steps A1 to A3:

[0054] In A1: Real-time transient ground potential data of multiple grounding points in the high-voltage switchgear substation are collected at equal intervals according to the preset transient detection time interval, including the instantaneous value of ground potential difference, transient rate of change of grounding current and grounding loop impedance;

[0055] For example, in this embodiment, the transient detection time interval is set to 50 milliseconds.

[0056] In A2: Record the initial communication parameters for the secondary loop system;

[0057] In A3: Based on the physical topology of the secondary loop system, the secondary loop system is divided into M independent communication loop segments. Each communication loop segment contains a complete transmit-receive link, and the characteristic impedance of the loop segment is set as the basis for division.

[0058] It should be noted that in substations with complex geological conditions, such as those in mountainous or mining areas, dynamic potential differences between different grounding points caused by transient events such as lightning strikes and short circuits can create common-mode interference. Directly monitoring the entire secondary circuit system makes it difficult to accurately locate the interference source. By dividing the system into multiple independent communication loops, the ground potential interference characteristics and communication quality of each loop can be monitored separately. Due to differences in grounding conditions, line lengths, and impedance characteristics among different loops, their degree of susceptibility to ground potential transients also varies. Loops closer to the main grounding grid are less affected by interference, while loops farther from the main grounding grid are more significantly affected by geological inhomogeneities. Through loop segmentation, precise interference location and hierarchical processing can be achieved, providing accurate data support for subsequent communication route reconstruction and isolation protection.

[0059] It should also be noted that dividing the communication loops facilitates the establishment of a ring network redundancy mechanism. When the communication quality of a certain loop is detected to be deteriorating, it can be automatically switched to a backup loop to ensure the reliability of secondary loop communication.

[0060] In this embodiment of the invention, step S200 presets an interference detection period, and synchronously performs ground potential common-mode interference analysis and ring network communication quality assessment of the secondary loop system according to the interference detection period, and outputs the system's interference analysis results and communication quality assessment results in real time, including:

[0061] In this embodiment of the invention, performing ground potential common-mode interference analysis on the secondary loop system includes the following sub-steps B1~B10:

[0062] In B1: A high-frequency sensor array is arranged at the grounding node of the high-voltage switchgear substation to periodically collect multi-channel signal waveforms of the secondary circuit system according to the transient detection time interval, and the collected signal waveforms are standardized and enhanced.

[0063] It should be noted that there are significant differences in the signal characteristics between the area affected by ground potential interference and the area that is not affected by interference in the secondary loop system. This is because when the ground potential changes transiently, the interfered signal will exhibit characteristics such as abrupt amplitude changes, phase shifts, and harmonic distortions, resulting in a smoother signal envelope and more concentrated spectral energy. In contrast, the unaffected signal maintains a normal amplitude distribution and phase characteristics.

[0064] Specifically, in this embodiment, the acquisition of multi-channel signal waveforms includes: multi-channel synchronous acquisition within the range of 0° reference phase to 45° offset phase; the acquisition density is 5 acquisition points per meter.

[0065] Specifically, the standardization and signal enhancement processing of the acquired signal waveforms includes:

[0066] A high-stability standard sine wave generator is installed in the substation control room as a reference source, and its output frequency is consistent with the secondary circuit communication carrier frequency.

[0067] At the beginning of each acquisition cycle, the reference signal and the actual signal of each channel are acquired synchronously. By calculating the scaling factor between the amplitude of each channel signal and the amplitude of the reference signal, the amplitude of all acquired waveforms is scaled and unified to a standard level based on the amplitude of the reference signal.

[0068] A normalized least mean square adaptive filter is used to construct a reference noise vector using the neighboring signal samples of the current acquisition point. The background noise component in the signal is dynamically estimated and subtracted by iteratively updating the filter weight coefficients in real time.

[0069] It should be noted that the convergence condition for real-time iteration is that the rate of change of the mean square error of the filter output signal is less than a threshold (e.g., 0.001) for three consecutive iterations. At this point, the signal noise is considered to have been effectively suppressed, and the filter coefficients tend to stabilize. The steps for updating the filter weight coefficients include: at each sampling time, calculating the output signal based on the current filter coefficients and the reference noise vector; then, based on the error between the output signal and the desired signal, adaptively adjusting the coefficients using the normalized least mean square algorithm, i.e., iteratively updating the weight coefficients by multiplying the step size parameter by the error signal, until the convergence condition is met.

[0070] In B2: Local extrema are extracted from the processed signal waveform to obtain local extrema points. Then, the signal strength of the local extrema points of all communication loop segments is extracted. The sampling points with signal strength greater than the strength screening threshold are taken as the secondary loop interference centers of each conducted interference path.

[0071] Specifically, the intensity screening threshold is used to select the critical signal intensity value of the interference center from the local extreme points of all communication loop segments. In this embodiment, after sorting the signal intensities of the local extreme points of all communication loop segments in descending order, the signal intensity value at the 20th percentile is taken as the intensity screening threshold. Common-mode interference caused by ground potential transients in the secondary loop system usually manifests as a significant abnormal enhancement of the local signal. By selecting extreme points with higher intensities, we can focus on the signal abrupt change regions most likely caused by interference, thereby improving the accuracy and efficiency of interference center location and avoiding misjudging normal signal fluctuations as interference signals.

[0072] In B3: Calculate the comprehensive interference index of the neighborhood surrounding the secondary loop interference center. The formula is expressed as:

[0073] ,

[0074] ,

[0075] ,

[0076] ,

[0077] in, , , All are weighting coefficients, satisfying + + =1; Indicates the fluctuation of ground potential-sensitive signals. Indicates the steepness of the signal edge. This represents the maximum gradient value within the analysis region. This represents the ground potential distortion compensation factor. N This represents the number of neighboring sampling points, where n represents the index of the number of neighboring sampling points. This represents the signal amplitude at the nth neighboring sampling point. This represents the average signal amplitude within the neighborhood. Indicates the ground potential sensitivity factor. This represents the instantaneous value of the ground potential difference. Indicates the size of the gradient calculation window. This represents the index of the gradient calculation window. and These represent the gradients of the signal in the spatial and temporal dimensions, respectively. This indicates the signal amplitude at the current sampling point. This represents the global average signal amplitude. This represents the baseline volatility under the reference state, and exp represents the natural exponential function.

[0078] It should be noted that the comprehensive interference index of the neighborhood surrounding the secondary loop interference center can accurately identify the common-mode interference area caused by transient changes in ground potential by comprehensively considering signal fluctuation characteristics, edge features and the influence of ground potential distortion.

[0079] In B4: When the comprehensive interference index is greater than or equal to the set interference judgment threshold, the current sampling point is determined to belong to the interference area; when the comprehensive interference index is less than the set interference judgment threshold, the current sampling point is determined to belong to the normal area; the sampling points in the surrounding area are iteratively judged until the comprehensive interference index of the boundary points is less than the set interference judgment threshold.

[0080] Specifically, in this embodiment, the interference judgment threshold is set based on statistical analysis of long-term operating data of the system under interference-free baseline conditions. This includes: continuously collecting the comprehensive interference index of a large number of signal sampling points in the secondary circuit during the normal and stable operation of the substation to obtain a baseline dataset, and calculating the probability distribution of this dataset. The dataset is then sorted according to the probability distribution results, and the baseline data corresponding to the 95th percentile is used as the interference judgment threshold.

[0081] In B5: Obtain the set of conducted interference paths for each communication loop segment of the secondary loop system, and record the equivalent interference range of each conducted interference path. ;

[0082] Specifically, for any conducted interference path, the number P of sampling points within all interference areas contained in the path is counted, and the mean of the absolute values ​​of the differences between the signal amplitude of each sampling point within the interference area and the average amplitude of the normal area in the same loop segment is calculated as the average abnormal signal amplitude. The number of sampling points P and the average signal abnormal amplitude are compared. The product of these is used as the equivalent interference range of the conducted interference path. ;

[0083] It should be noted that, considering that the impact of ground potential common-mode interference on the secondary circuit depends not only on the spatial propagation range but also on the degree of abnormality in the amplitude of the interference signal, simply describing the interference range with geometric dimensions cannot accurately reflect the energy concentration effect of the interference. Therefore, this embodiment uses the number of sampling points P within the interference area and the average abnormal amplitude of the signal. The product of these factors serves as the equivalent interference range, where the average abnormal signal amplitude can effectively suppress the influence of signal fluctuations under normal operating conditions and highlight the amplitude distortion component caused by interference.

[0084] In B6: The secondary loop system is modeled as a three-dimensional impedance network model, with each network element representing an impedance analysis node;

[0085] Specifically, in this embodiment, it is assumed that the impedance characteristics within each network unit are uniformly distributed. This is done to transform the continuous loop system into a discrete impedance analysis unit, which facilitates the subsequent calculation and analysis of interference propagation paths. The set of conducted interference paths of each communication loop in the secondary loop system is extracted, and an array of impedance characteristic testing devices is arranged at the network node position corresponding to each conducted interference path to inject a sweep frequency test signal into the secondary loop system.

[0086] In B7: Extract the propagation delay parameter of the test signal, calculate the propagation characteristic parameter of the test signal on the propagation path in the secondary loop system based on the propagation delay parameter, and iteratively adjust the impedance characteristics of each network unit based on the impedance distribution reconstruction algorithm to reconstruct the impedance distribution characteristics inside the secondary loop system.

[0087] Specifically, extract the propagation delay parameter of the test signal. This typically corresponds to the path of least impedance for signal propagation and reflects the time delay characteristics of the test signal propagating within the secondary circuit system.

[0088] Specifically, the propagation characteristic parameters of the test signal along the propagation path in the secondary loop system are calculated based on the propagation delay parameter. The formula is expressed as:

[0089] ,

[0090] in, The value represents the equivalent path length of the propagation path of the test signal from the u-th signal injection point to the v-th signal receiving point within the k-th network cell. K represents the total number of network cells traversed by the propagation path in the secondary loop system, and k represents the index of the network cell traversed by the propagation path in the secondary loop system.

[0091] It should be noted that this formula indicates that the propagation delay of the test signal within each network cell during propagation is related to the impedance characteristics of that network cell, and the total propagation delay is the sum of the propagation delays of all network cells.

[0092] Specifically, an impedance characteristic inversion model is established, as follows: Where A is the correlation matrix between propagation paths and network units. This is a vector of the reciprocals of the impedance characteristics of each network element. This is the measured propagation delay vector.

[0093] It should be noted that the elements in the correlation matrix A ,in, This represents the overlap length of the p-th propagation path within the k-th network element. The correlation matrix describes the impedance relationship between the test signal propagation path and the network elements in the secondary loop system, linking the impedance characteristics of the test signal in each network element with the propagation delay. Furthermore, the reciprocal of the impedance characteristic is used as an unknown in the impedance characteristic inversion model to simplify the calculation process and improve numerical stability.

[0094] Specifically, based on the impedance characteristic inversion model, the impedance characteristics of each network unit are iteratively adjusted through the impedance distribution reconstruction algorithm to reconstruct the impedance distribution characteristics inside the secondary loop system.

[0095] It should be noted that the impedance distribution reconstruction algorithm is an iterative algorithm for analyzing the impedance characteristics of power systems. It solves an overdetermined system of equations using a least-squares optimization method to reconstruct the impedance distribution within the secondary loop system from propagation delay data. Iteratively adjusting the reciprocal of the impedance characteristic of each network element minimizes the root mean square error between the calculated propagation delay and the measured delay.

[0096] In B8: The impedance anomaly threshold is used to identify abnormal paths in the impedance distribution within the reconstructed secondary loop system, and the spatial distribution of all continuous interference ranges is extracted through network topology connectivity analysis.

[0097] It should be noted that the impedance anomaly threshold was obtained through statistical analysis of a large amount of experimental data. Specifically, this involved collecting impedance characteristic data of each network unit in the secondary circuit system under normal substation operating conditions and known interference conditions, establishing a baseline impedance distribution database that included the influence of different grounding conditions, equipment status, and environmental factors; and determining the impedance anomaly threshold as the 95th percentile of the baseline impedance distribution through fitting analysis of the probability distribution of these data. This ensures that under normal operating conditions, only no more than 5% of network units may be misjudged as abnormal paths due to random fluctuations or minor anomalies, thereby improving the accuracy of anomaly identification and anti-interference capability.

[0098] In B9: An interference impact range identification method is used to extract the impact range of all coupled interference paths, where each impact range corresponds to an interference domain. The parameters of each interference domain are recorded. Along the signal propagation path, all interference domains are traversed. The equivalent interference intensity of all interference domains is calculated using an interference impact assessment model, and the maximum equivalent interference intensity is taken as the interference level assessment index representing the coupled interference path. ;

[0099] Specifically, the equivalent interference intensity of the interference field is calculated using the following formula:

[0100] ,

[0101] in, This represents the equivalent interference intensity of the k-th interference domain. It is the sum of the equivalent interference ranges of all conducted interference paths within the interference domain. The median of the equivalent interference range for all conducted interference paths. The maximum transient overshoot amplitude at each sampling point within the interference domain. This represents the average transient overshoot amplitude of the secondary loop system under stable, uninterrupted operation. and Preset weighting coefficients and satisfying The maximum value of the equivalent interference intensity across all interference domains is taken as the evaluation index representing the interference level of the coupled interference path. ,Right now .

[0102] It should be noted that parameters are extracted from the time-domain signals collected in each interference domain, and these extracted parameters are substituted into the interference impact assessment model. This model is a quantization based on a linear combination of weighting coefficients and parameters. The equivalent interference intensity value of each interference domain is calculated sequentially along the signal propagation direction.

[0103] It should also be noted that after extracting the influence range of the coupling interference path in B9, it is necessary to quantitatively evaluate each interference domain to determine the interference level of the entire coupling path. Therefore, an interference impact assessment model is constructed: for the k-th interference domain, its equivalent interference intensity... In the first term of the model, This is the sum of the equivalent interference ranges of all identified conducted interference paths within this scope. The median of the equivalent range of all conducted interference paths is taken, and the ratio between the two represents the degree of spatial accumulation of interference; in the second term of the model, This represents the maximum transient overshoot amplitude at the signal sampling point within this domain. The ratio of the two values ​​represents the average transient overshoot amplitude statistically analyzed over a long period under undisturbed stable operation of the system. The weighting coefficients satisfy the following: Based on engineering experience, it is usually designed To appropriately highlight the spatial accumulation effect, the model outputs the following results. This method can comprehensively reflect the severity of interference in a single domain. Since the final impact of coupled interference depends on the most severe domain along the path, after traversing all domains along the signal propagation direction, the maximum value of the calculated result is taken as the evaluation index of the interference level of the entire coupled interference path. It should also be noted that taking the maximum value can avoid underestimation of interference caused by averaging.

[0104] In B10: based on the equivalent interference range of each conducted interference path. Interference level assessment index for coupling interference path Calculate the first interference evaluation coefficient. The formula is expressed as:

[0105] ,

[0106] in, This represents the total number of conducted interference paths. For the first Potential gradient distribution coefficient of each conducted interference path, For the first The potential gradient distribution coefficient of the coupled interference path corresponding to the i-th conducted interference path, where i is the index of the signal sampling point, and I is the i-th... The total number of all signal sampling points in each conducted interference path. For the first The transient overshoot amplitude at the i-th signal sampling point in each conducted interference path. This is the reference transient overshoot amplitude of the i-th signal sampling point in the initial state of the secondary loop system. For the first Transient ground potential impact intensity at each conducted interference path For the secondary loop system in the initial state, the first The transient impact intensity of the reference ground potential at each conducted interference path. This is the maximum permissible threshold for the transient impact intensity of the substation's ground potential.

[0107] It should be noted that the first interference evaluation coefficient In the calculation formula, It is used to reflect the interference propagation characteristics between the conduction path and the coupling path. Its meaning is to quantify the degree of interaction between conducted interference and coupled interference in the secondary circuit under the relative influence of ground potential transient impact.

[0108] In this embodiment of the invention, performing a ring network communication quality assessment of the secondary loop system includes the following sub-steps C1 and C2:

[0109] In C1: The dielectric spectrum of each communication loop segment of the secondary loop system is scanned and detected by a wideband spectrum analyzer to obtain the dielectric loss characteristic data of each communication loop segment;

[0110] In C2: The second interference evaluation coefficient is calculated based on the dielectric loss characteristic data of each communication loop segment. The formula is expressed as:

[0111] ,

[0112] Where m is the index of the communication loop segment from the near end to the far end of the secondary loop system, and M represents the total number of communication loop segments from the near end to the far end of the secondary loop system. The dielectric loss factor of the characteristic frequency band of the m-th communication loop segment in the secondary loop system. This is the reference dielectric loss factor for the secondary loop system in its initial state. Let be the dielectric loss tangent of the m-th communication loop segment in the secondary loop system. This is the reference dielectric loss tangent of the secondary loop system in its initial state. Let be the impulse grounding impedance around the m-th communication loop segment in the secondary circuit system. Let be the reference impulse grounding impedance around the m-th communication loop segment in the initial state of the secondary loop system. This refers to the maximum permissible fluctuation range of the impulse grounding impedance of a substation.

[0113] In this embodiment of the invention, step S300, which comprehensively judges the communication reliability of the secondary loop system based on interference analysis results and communication quality assessment results, and executes corresponding communication route reconstruction and isolation protection strategies according to the comprehensive judgment results, includes the following sub-steps D1 and D2:

[0114] In D1: Based on interference analysis results and communication quality assessment results, a comprehensive judgment is made on the communication reliability of the secondary loop system; detailed steps include:

[0115] The first interference evaluation coefficient Second interference evaluation coefficient Importing the comprehensive interference assessment strategy into the communication interference assessment strategy yields the comprehensive interference assessment index. : ;

[0116] If the overall interference assessment index of the current secondary circuit system is greater than or equal to the interference level threshold, the communication quality level of the current secondary circuit system is poor; if the overall interference assessment index of the current secondary circuit system is less than the interference level threshold, the communication quality level of the current secondary circuit system is good.

[0117] It should be noted that the threshold for interference level is set based on the critical conditions for the system to maintain the minimum acceptable communication performance, including: establishing the correspondence between the comprehensive interference assessment index and the communication performance index through laboratory testing and analysis of historical fault data in the field, and finding the comprehensive interference assessment index corresponding to the performance critical point as the interference level threshold.

[0118] In D2: Based on the comprehensive judgment results, the corresponding communication route reconstruction and isolation protection strategies are executed; detailed steps include:

[0119] When the communication quality level of the secondary loop system is poor, extract the set of conducted interference paths in each communication loop segment of the secondary loop system and calculate the first interference propagation direction coefficient of adjacent communication loop segments.

[0120] When the communication quality level of the secondary loop system is poor, extract the spectral characteristic data of each communication loop segment in the secondary loop system and calculate the second interference propagation direction coefficient of adjacent communication loop segments.

[0121] Based on the first interference propagation direction coefficient and the second interference propagation direction coefficient, the interference propagation direction of the secondary loop system is determined, and the corresponding communication route reconstruction and isolation protection strategy is executed according to the interference propagation direction.

[0122] In this embodiment of the invention, the first interference propagation direction coefficient of adjacent communication loop segments is calculated:

[0123] ,

[0124] in, This represents the first interference propagation direction coefficient of the m-th communication segment. , , Let represent the total number of conducted interference paths in the m-th, m-1-th, and m+1-th communication loop segments, respectively. This represents the average value of conducted interference paths in the communication loop segment. , , These represent the maximum interference intensity of the conducted interference path in the m-th, m-1-th, and m+1-th communication loop segments, respectively.

[0125] Specifically, when When the value is greater than 1, it is determined that the interference propagation direction of the secondary circuit system is propagating into the station. At this time, the communication traffic of the affected loop segment is switched to the preset backup route in the station, and the grounding compensation device in the inner layer of the substation is adjusted simultaneously.

[0126] Specifically, when When the value is less than 1, the direction of interference propagation in the secondary circuit system is determined to be propagation towards the outside of the station. At this time, the communication traffic of the affected loop segment is routed to a detour path outside the station, and the impedance matching device at the substation boundary is adjusted simultaneously.

[0127] Specifically, when When the value equals 1, it is determined that the interference propagation direction of the secondary circuit system is bidirectional balanced propagation. At this time, the whole-station communication route reconstruction strategy is activated, and the critical business traffic is preferentially scheduled to the core ring segment with the least interference impact. At the same time, the grounding compensation device and impedance matching device are activated.

[0128] It should be noted that the key business traffic in this embodiment mainly includes real-time control signals, protection trip commands, status monitoring data and equipment interlocking information that are directly related to high-voltage switch protection and automation functions. It is essential to prioritize the stable transmission of these traffic in the core loop segment with the least interference and the best communication quality to ensure the safe operation of the substation and rapid fault response.

[0129] In this embodiment of the invention, the second interference propagation direction coefficient of adjacent communication loop segments is calculated:

[0130] ,

[0131] in, This is the second interference propagation direction coefficient for the m-th communication loop segment. This represents the average value of the conducted interference path in the communication loop segment. These represent the total number of conducted interference paths for the m-th, m-1-th, and m+1th communication loop segments, respectively. These represent the maximum interference intensity of the conducted interference path in the m-th, m-1-th, and m+1-th communication loop segments, respectively.

[0132] Specifically, when When the value is greater than 1, it is determined that the interference propagation direction of the secondary circuit system is propagating into the station. At this time, the communication traffic of the affected loop segment is switched to the preset backup route within the station, and the filtering and suppression device in the inner layer of the substation is adjusted simultaneously.

[0133] Specifically, when When the value is less than 1, the direction of interference propagation in the secondary circuit system is determined to be propagation towards the outside of the station. At this time, the communication traffic of the affected loop segment is routed to a detour path outside the station, and the shielding protection device at the substation boundary is adjusted simultaneously.

[0134] Specifically, when When the value equals 1, it is determined that the interference propagation direction of the secondary loop system is bidirectional balanced propagation. At this time, the whole-site communication route reconstruction strategy is activated, and the critical business traffic is preferentially scheduled to the core loop segment with the least interference impact. At the same time, the filtering suppression device and the shielding protection device are activated.

[0135] It should be noted that interference propagation in the secondary loop system tends to occur in the direction of the largest interference propagation coefficient. For the near end of the secondary loop system, the interference level differs from that at the far end due to factors such as lower grounding impedance and tighter connection with the main grounding grid. The far end, on the other hand, is directly exposed to a complex geological environment and is more significantly affected by transient events such as lightning strikes and short circuits. For example, it has been observed that the interference level gradually increases with distance, indicating that the deterioration of the grounding conditions at the far end of the secondary loop system is an important factor leading to a decrease in communication quality.

[0136] As described in the above embodiments, this invention achieves accurate judgment of the direction of interference propagation by integrating a dual evaluation mechanism of conducted interference and coupled interference. Combined with the coordinated control of grounding compensation device, impedance matching device and shielding protection device, a multi-level interference suppression system is formed. This system can dynamically adjust the suppression strategy according to the interference propagation characteristics, which not only effectively eliminates the isolation failure problem caused by transient differences in ground potential, but also optimizes the allocation of system resources, providing comprehensive protection for the safe and stable operation of the secondary circuit of high-voltage switch under extreme conditions.

[0137] Example 2: This example provides a loop communication system for isolating control flow in the secondary circuit of a high-voltage switch, comprising:

[0138] The preliminary processing module is used to collect real-time transient ground potential data from multiple grounding points in the high-voltage switchgear substation, and to perform initial communication parameter recording and communication ring network topology division processing for the secondary circuit system within the substation.

[0139] The analysis and evaluation module is used to preset the interference detection cycle, and synchronously perform ground potential common-mode interference analysis and ring network communication quality evaluation of the secondary circuit system according to the interference detection cycle, and output the interference analysis results and communication quality evaluation results of the system in real time.

[0140] The strategy determination module is used to comprehensively judge the communication reliability of the secondary loop system based on the interference analysis results and communication quality assessment results, and execute the corresponding communication route reconstruction and isolation protection strategies according to the comprehensive judgment results.

[0141] It should be noted that the technical solution of the loop communication system for isolating the secondary circuit control flow of the high-voltage switch is based on the same concept as the above-mentioned loop communication method for isolating the secondary circuit control flow of the high-voltage switch. For details not described in detail in this embodiment, please refer to the description of the above-mentioned loop communication method for isolating the secondary circuit control flow of the high-voltage switch.

[0142] The above-mentioned unit modules can be embedded in the processor of the electronic device in hardware form or independent of it, or they can be stored in the memory of the electronic device in software form, so that the processor can call and execute the corresponding operations of the above modules.

[0143] This embodiment also provides an electronic device, which includes a processor, a memory, a communication interface, a display screen, and an input device connected via a system bus. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, carrier networks, NFC (Near Field Communication), or other technologies. When the computer program is executed by the processor, it implements a loop-based communication method for isolating the secondary circuit control flow of a high-voltage switch. The display screen can be a liquid crystal display (LCD) or an e-ink display. The input device can be a touch layer covering the display screen, buttons, a trackball, or a touchpad mounted on the device's casing, or an external keyboard, touchpad, or mouse.

[0144] This embodiment also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method proposed in the above embodiments.

[0145] The storage medium proposed in this embodiment belongs to the same inventive concept as the method proposed in the above embodiments. Technical details not described in detail in this embodiment can be found in the above embodiments, and this embodiment has the same beneficial effects as the above embodiments.

[0146] Based on the above description of the implementation methods, those skilled in the art can clearly understand that the present invention can be implemented using software and necessary general-purpose hardware, and of course, it can also be implemented using hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory, random access memory, flash memory, hard disk, or optical disk, and includes several instructions to cause an electronic device (which may be a personal computer, server, or network device, etc.) to execute the method of the embodiments of the present invention.

[0147] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the present invention.

Claims

1. A loop communication method for achieving flow isolation in the secondary circuit control of a high-voltage switch, characterized in that, include: Real-time transient ground potential data of multiple grounding points in high-voltage switchgear substations are collected, and initial communication parameters and communication ring network topology are recorded for the secondary circuit system within the substation. A preset interference detection cycle is set, and ground potential common-mode interference analysis and ring network communication quality assessment of the secondary circuit system are performed synchronously according to the interference detection cycle, and the interference analysis results and communication quality assessment results of the system are output in real time. Based on the interference analysis results and communication quality assessment results, the communication reliability of the secondary loop system is comprehensively judged, and the corresponding communication route reconstruction and isolation protection strategies are executed according to the results of the comprehensive judgment. The common-mode interference analysis of the ground potential of the secondary circuit system includes: A high-frequency sensor array is arranged at the grounding node of the high-voltage switchgear substation to periodically collect multi-channel signal waveforms of the secondary circuit system according to the transient detection time interval, and to perform standardization and signal enhancement processing on the collected signal waveforms. The processed signal waveform is subjected to local extremum extraction to obtain local extremum points. Then, the signal intensity of the local extremum points of all communication loop segments is extracted. The sampling points with the signal intensity greater than the intensity screening threshold are taken as the secondary loop interference centers of each conducted interference path. Calculate the comprehensive interference index of the neighborhood surrounding the interference center of the secondary loop; When the comprehensive interference index is greater than or equal to the set interference judgment threshold, the current sampling point is determined to belong to the interference area; when the comprehensive interference index is less than the set interference judgment threshold, the current sampling point is determined to belong to the normal area; the sampling points in the surrounding area are iteratively judged until the comprehensive interference index of the boundary points is less than the set interference judgment threshold. Obtain the set of conducted interference paths for each communication loop segment of the secondary loop system, and record the equivalent interference range for each conducted interference path; The analysis of ground potential common-mode interference in the secondary circuit system also includes: The secondary loop system is modeled as a three-dimensional impedance network model, with each network element representing an impedance analysis node. Extract the propagation delay parameter of the test signal, calculate the propagation characteristic parameter of the test signal on the propagation path in the secondary loop system based on the propagation delay parameter, and iteratively adjust the impedance characteristic of each network unit based on the impedance distribution reconstruction algorithm to reconstruct the impedance distribution characteristic inside the secondary loop system. Anomaly thresholds are used to identify abnormal paths in the impedance distribution within the reconstructed secondary loop system, and the spatial distribution of all continuous interference ranges is extracted through network topology connectivity analysis. An interference impact range identification method is used to extract the impact range of all coupled interference paths, where each impact range corresponds to an interference domain. The parameters of each interference domain are recorded. All interference domains are traversed along the signal propagation path. The equivalent interference intensity of all interference domains is calculated through the interference impact assessment model, and the maximum equivalent interference intensity is taken as the interference degree assessment index representing the coupled interference path. The first interference evaluation coefficient is calculated based on the equivalent interference range of each conducted interference path and the interference degree evaluation index of the coupled interference path.

2. The loop communication method for achieving flow isolation in the secondary circuit control of a high-voltage switch as described in claim 1, characterized in that, The process involves collecting real-time transient ground potential data from multiple grounding points in the high-voltage switchgear substation, recording initial communication parameters for the secondary circuit system within the substation, and performing communication ring network topology partitioning, including: According to the preset transient detection time interval, real-time ground potential transient data of multiple grounding points in the high-voltage switchgear substation are collected at equal intervals, including the instantaneous value of ground potential difference, the transient rate of change of grounding current and the grounding loop impedance. Record the initial communication parameters of the secondary loop system; Based on the physical topology of the secondary loop system, the secondary loop system is divided into M independent communication loop segments. Each communication loop segment contains a complete transmit-receive link, and the characteristic impedance of the loop segment is set as the basis for division.

3. The loop communication method for achieving flow isolation in the secondary circuit control of a high-voltage switch as described in claim 2, characterized in that, The ring network communication quality assessment includes: Using a wideband spectrum analyzer, dielectric spectrum scanning detection is performed on each communication loop segment of the secondary loop system to obtain dielectric loss characteristic data for each communication loop segment; Based on the dielectric loss characteristic data of each communication loop segment, the second interference evaluation coefficient is calculated.

4. The loop communication method for achieving flow isolation in the secondary circuit control of a high-voltage switch as described in claim 3, characterized in that, The comprehensive judgment on the communication reliability of the secondary loop system based on the interference analysis results and communication quality assessment results includes: The first interference evaluation coefficient and the second interference evaluation coefficient are imported into the comprehensive communication interference evaluation strategy to obtain the comprehensive interference evaluation index. If the overall interference assessment index of the current secondary circuit system is greater than or equal to the interference level threshold, the communication quality level of the current secondary circuit system is poor; if the overall interference assessment index of the current secondary circuit system is less than the interference level threshold, the communication quality level of the current secondary circuit system is good.

5. The loop communication method for achieving flow isolation in the secondary circuit control of a high-voltage switch as described in claim 4, characterized in that, The step of executing the corresponding communication route reconstruction and isolation protection strategy based on the comprehensive judgment result includes: When the communication quality level of the secondary loop system is poor, extract the set of conducted interference paths in each communication loop segment of the secondary loop system and calculate the first interference propagation direction coefficient of adjacent communication loop segments. When the communication quality level of the secondary loop system is poor, extract the spectral characteristic data of each communication loop segment of the secondary loop system and calculate the second interference propagation direction coefficient of adjacent communication loop segments. Based on the first interference propagation direction coefficient and the second interference propagation direction coefficient, the interference propagation direction of the secondary loop system is determined, and the corresponding communication route reconstruction and isolation protection strategy is executed according to the interference propagation direction.

6. A loop communication system for isolating control flow in the secondary circuit of a high-voltage switch, employing the loop communication method for isolating control flow in the secondary circuit of a high-voltage switch as described in any one of claims 1 to 5, characterized in that, include: The preliminary processing module is used to collect real-time transient ground potential data from multiple grounding points in the high-voltage switchgear substation, and to perform initial communication parameter recording and communication ring network topology division processing for the secondary circuit system within the substation. The analysis and evaluation module is used to preset the interference detection cycle, and synchronously perform ground potential common-mode interference analysis and ring network communication quality evaluation of the secondary circuit system according to the interference detection cycle, and output the interference analysis results and communication quality evaluation results of the system in real time. The strategy determination module is used to comprehensively judge the communication reliability of the secondary loop system based on the interference analysis results and communication quality assessment results, and execute the corresponding communication route reconstruction and isolation protection strategy according to the result of the comprehensive judgment.

7. An electronic device comprising a memory and a processor, characterized in that: The memory is used to store computer-executable instructions, and when the processor executes the computer-executable instructions, it implements the steps of the loop communication method for implementing flow isolation control of the secondary circuit of a high-voltage switch as described in any one of claims 1 to 5.

8. A computer-readable storage medium storing computer-executable instructions thereon, characterized in that: When the computer-executable instructions are executed by the processor, they implement the steps of the loop communication method for implementing flow isolation control in the secondary circuit of a high-voltage switch as described in any one of claims 1 to 5.

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