A method and system for locating and suppressing HPLC communication interference

Abstract

The application discloses an HPLC communication interference positioning and suppression method and system. The method determines a plurality of associated nodes corresponding to an abnormal HPLC link according to an electrical topology relationship, determines a corresponding interference comprehensive score based on communication interference characteristics of each associated node and screens candidate interference source nodes; determines an interference source node from the candidate interference source nodes according to a disturbed degree distribution reflected by the interference comprehensive scores of the plurality of associated nodes and an electrical distance relationship between each candidate interference source node and the plurality of associated nodes; associates communication interference characteristics of the interference source node with equipment operation characteristics, determines an interference type and executes corresponding HPLC communication interference suppression. The interference source is discriminated by combining the interference degrees of the plurality of associated nodes and the electrical position relationship, thereby improving the accuracy of HPLC communication interference positioning and disposal.

Description

Technical Field

[0001] This invention relates to the field of power line carrier communication technology, specifically to an HPLC communication interference localization and suppression method and system. Background Technology

[0002] High-speed power line carrier communication (HPLC) utilizes low-voltage power lines for data transmission and is widely used in low-voltage distribution area data acquisition, information aggregation, and terminal control scenarios. After distributed photovoltaic (PV) grid integration, factors such as high-frequency switching operations of PV inverters, changes in grid-connected operating status, and load switching can interfere with HPLC communication, causing multiple electrically connected nodes to simultaneously exhibit communication anomalies. Since communication interference can propagate along low-voltage power lines and their branches, when one node or device experiences communication interference, other electrically connected nodes may also be affected, resulting in multiple HPLC nodes simultaneously exhibiting communication anomalies of varying degrees.

[0003] Existing technologies already contain solutions for locating interference sources in power line communication. For example, CN119298943B discloses a power line noise analysis method based on carrier spectrum analysis, which determines the location of power line noise sources based on carrier spectrum anomalies and further identifies and suppresses noise types; CN114062848B discloses a forced power oscillation disturbance source location method and apparatus based on equivalent electrical distance, which uses the equivalent electrical distance between multiple monitoring nodes and the disturbance source to locate the disturbance source.

[0004] However, the aforementioned existing technologies focus on carrier spectrum anomaly localization or disturbance source localization based on electrical distance, respectively. When multiple associated nodes experience communication anomalies of varying degrees at the same time, it is still difficult to effectively distinguish multiple possible interference source nodes. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the purpose of this invention is to provide an HPLC communication interference localization and suppression method and system to solve the problem that when multiple related nodes experience communication abnormalities at the same time, it is difficult to accurately identify the actual interference source and to determine the interference type and implement corresponding interference suppression for the actual interference source.

[0006] To achieve the above objectives, the present invention provides an HPLC method and system for locating and suppressing communication interference, comprising: Based on the electrical topology, multiple associated nodes corresponding to the abnormal HPLC link are identified, and the corresponding comprehensive interference score is determined based on the communication interference characteristics of each associated node. Candidate interference source nodes are determined based on the comprehensive interference score. The communication interference characteristics include at least one of the following: carrier signal amplitude attenuation, interference bandwidth, noise power spectral density, signal-to-noise ratio, packet loss rate, and communication delay. Based on the distribution of disturbance severity reflected by the comprehensive interference scores of multiple associated nodes, and the electrical distance relationship between each candidate interference source node and multiple associated nodes, the interference source node is determined from the candidate interference source nodes. The communication interference characteristics of the interference source node are correlated with the equipment operation characteristics to determine the type of interference, and the corresponding HPLC communication interference suppression is performed.

[0007] Specifically, this invention first takes the abnormal HPLC link as a starting point, determines multiple associated nodes corresponding to the abnormal HPLC link based on the electrical topology of the low-voltage distribution network, and obtains the communication interference characteristics of each associated node. Based on these communication interference characteristics, a comprehensive interference score is determined for each associated node. The comprehensive interference score characterizes the degree of communication interference experienced by each associated node. Based on this, candidate interference source nodes that may generate the communication interference are screened according to the comprehensive interference scores of each associated node, thereby narrowing the interference source location range from the multiple associated nodes corresponding to the abnormal HPLC link to the candidate interference source nodes.

[0008] Considering that HPLC communication interference can propagate along low-voltage power lines, nodes with high levels of communication anomalies may be affected by interference from other nodes, rather than necessarily being the actual source of interference. Therefore, after identifying candidate interference source nodes, the interference source is not determined directly based on the overall interference score of a single candidate node. Instead, a further judgment is made for each candidate interference source node by combining its electrical distance from multiple associated nodes and the overall interference score of those associated nodes. Thus, the electrical positional relationship of the candidate interference source node relative to multiple associated nodes, along with the actual degree of interference exhibited by the multiple associated nodes, are used as the criteria for identifying the interference source. This allows for the identification of the interference source node that corresponds to the interference state of the multiple associated nodes from among the candidate interference source nodes.

[0009] After identifying the interference source node, this node is used as the subsequent interference identification target. The communication interference characteristics of the interference source node are correlated with the corresponding equipment operation characteristics. The type of interference causing the current HPLC communication anomaly is determined through the correspondence between the two. Since the determination of the interference type is based on the actual location of the interference source node, it is possible to correlate the abnormal characteristics appearing on the communication side with the operating status of the equipment that caused the anomaly, rather than judging the interference type solely based on the communication status of the interfered node.

[0010] Based on the determined interference type, HPLC communication interference suppression corresponding to the interference type is performed, thereby forming a process that sequentially connects the interference status evaluation of associated nodes, candidate interference source screening, actual interference source location, interference type identification and communication interference suppression.

[0011] Beneficial Effects: Compared with existing technologies, this invention identifies multiple associated nodes corresponding to abnormal HPLC links based on electrical topology relationships, determines corresponding comprehensive interference scores based on the communication interference characteristics of each associated node, and screens candidate interference source nodes based on the comprehensive interference scores. This limits interference source location to nodes electrically associated with the abnormal HPLC link. Furthermore, it identifies the interference source node based on the distribution of disturbance levels reflected by the comprehensive interference scores of multiple associated nodes and the electrical distance relationship between each candidate interference source node and multiple associated nodes. This ensures that interference source identification considers the disturbance levels of multiple associated nodes and their electrical positional relationship relative to candidate interference source nodes, avoiding interference source judgment based solely on the communication anomaly level of a single node. This reduces the possibility of a disturbed node being misidentified as the actual interference source, improving the accuracy of HPLC communication interference source location. Furthermore, by associating the communication interference characteristics of the identified interference source nodes with equipment operating characteristics, it is possible to further identify the interference type for the actual interference source and perform corresponding HPLC communication interference suppression accordingly. This allows the interference location results to be used for subsequent interference identification and suppression processing, improving the targeting of HPLC communication interference processing. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0013] Figure 1 This is a schematic flowchart of an HPLC method for locating and suppressing communication interference. Figure 2 This is a schematic diagram of the low-voltage power distribution network HPLC communication network and associated nodes provided in this embodiment; Figure 3 This is a schematic diagram of the structure of an HPLC communication interference localization and suppression system. Detailed Implementation

[0014] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0015] Example 1 This embodiment provides a method for locating and suppressing HPLC communication interference, applied to low-voltage power distribution networks that use HPLC for data communication. In one implementation, a distribution area concentrator or edge gateway serves as the central coordinating node, while smart meters, branch monitoring devices, main meters for distribution areas, and electrical equipment or distributed power communication units with HPLC communication interfaces serve as end-side nodes. Each end-side node establishes an HPLC communication connection with the central coordinating node via a low-voltage power line.

[0016] In distributed photovoltaic (PV) grid-connection scenarios, the end-side nodes also include PV grid-connection terminals and inverter communication units with HPLC communication interfaces. The PV grid-connection terminal is located at the PV grid-connection node and is used to collect voltage, current, output power, and HPLC communication status data of the corresponding PV grid-connection node. The PV grid-connection node is the electrical connection node for the PV power generation unit to connect to the low-voltage distribution network. The central coordination node maintains the node identifiers, electrical connection relationships, branch affiliations, and HPLC communication paths of each end-side node, ensuring a correspondence between the HPLC communication topology and the electrical topology of the low-voltage distribution network.

[0017] like Figure 1 As shown, the HPLC communication interference localization and suppression method provided in this embodiment first determines multiple associated nodes corresponding to abnormal HPLC links based on electrical topology relationships, and determines the corresponding comprehensive interference score based on the communication interference characteristics of each associated node, and determines candidate interference source nodes based on the comprehensive interference score; then, based on the interference degree distribution reflected by the comprehensive interference scores of multiple associated nodes, and the electrical distance relationship between each candidate interference source node and multiple associated nodes, the interference source node is determined from the candidate interference source nodes; further, the communication interference characteristics of the determined interference source node are associated with the equipment operation characteristics of the corresponding device to determine the interference type, and the corresponding HPLC communication interference suppression is performed according to the interference type.

[0018] In one embodiment, the HPLC communication network includes a master station layer, an edge gateway layer, an HPLC backbone communication layer, and an end-side node layer; wherein, the master station layer is used for strategy management and historical data storage, the edge gateway layer is used for data acquisition, interference location, communication adjustment, and strategy distribution within the station area, the HPLC backbone communication layer is used to carry communication data and control commands through low-voltage power lines, and the end-side node layer is used to collect the communication status and equipment operation data of the corresponding nodes.

[0019] Since subsequent interference source localization requires comparing the communication disturbance status of different nodes under the same operating phase, and also needs to correlate communication anomalies with the operating status of corresponding equipment, HPLC communication status data, equipment operation data, and electrical topology data of each end-side node are acquired synchronously within the same sampling window. The HPLC communication status data includes carrier signal amplitude, noise power spectral density, signal-to-noise ratio, message success rate, packet loss rate, communication delay, and retransmission count, and also obtains the currently available communication frequency. Equipment operation data is determined according to the equipment type corresponding to the node; for example, for photovoltaic inverters, inverter switching frequency, output power, grid connection point voltage, and grid connection current are collected; for electrical loads, load switching status and reactive power are collected. Electrical topology data includes the electrical connection relationships between nodes, branch affiliation relationships, and line parameters used to determine the electrical distance between nodes.

[0020] The equipment operation data is used to form the equipment operation characteristics required for subsequent interference type identification. The sampling window is set according to the size of the transformer area and the real-time requirements of communication services, for example, it is set to 1 second to 5 minutes. By synchronously acquiring the communication status and equipment operation data of different nodes within the same sampling window, a unified time comparison basis is provided between different nodes and between communication status and equipment operation status.

[0021] When a node has missing data within the current sampling window, interpolation is performed using data from adjacent sampling windows and data from other nodes in the same electrical branch as that node to repair the data, and the corresponding data repair marker is retained. This data repair marker is used to distinguish between actual sampled data and repaired data during subsequent interference evaluation, preventing the corresponding node from being mistakenly identified as a communication anomaly node due to momentary data loss.

[0022] Before conducting node-level interference analysis, the HPLC link experiencing communication anomalies is identified. Since low-voltage power lines serve as both the power supply medium and the HPLC communication medium, changes in line impedance, load conditions, and branch structure can all cause multipath propagation and frequency-selective attenuation of the carrier signal. Therefore, relying solely on the results of a single message transmission is insufficient to fully reflect the degree of communication interference affecting the link. Thus, this embodiment evaluates link quality by combining the HPLC link channel response and the link communication status.

[0023] Specifically, for nodes in a low-voltage distribution network and nodes Its frequency ,time The HPLC link channel response is expressed as follows: (1) In the formula, Represents a node To node In frequency ,time HPLC link channel response; Represents a node To node The number of multipaths between them; Indicates the propagation path sequence number; Indicates the first The transmission path at any time The reflection and transmission parameters are as follows; Indicates the first The path length of each propagation path; Indicates the first The propagation delay of each propagation path; Represents frequency The corresponding line attenuation coefficient; It represents the imaginary unit.

[0024] Considering the varying degrees of attenuation of low-voltage power lines for carrier signals of different frequencies, the line attenuation coefficient... Determined based on the carrier frequency, in one implementation method, it is expressed as: (2) In the formula, This represents the basic attenuation parameter at low frequencies; This represents the frequency-dependent attenuation parameter; This represents a nonlinear exponent that indicates the attenuation varies with frequency. , and The parameters are determined in advance based on the line type, line length, and historical channel response data of the corresponding low-voltage line.

[0025] HPLC link channel response can reflect the impact of multipath propagation, line attenuation, and impedance changes on the carrier signal. The carrier signal amplitude attenuation is determined based on the channel response amplitude. For multiple communication frequencies, the frequency range experiencing significant interference is determined by combining the amplitude attenuation and noise conditions at each frequency. This information is further used as part of the communication interference characteristics in evaluating the degree of node interference and for subsequent interference type identification and communication frequency adjustment.

[0026] To avoid instantaneous fluctuations in a single communication metric directly leading to link anomaly detection, this embodiment further evaluates the overall communication status of the HPLC link by combining signal-to-noise ratio, message success rate, communication latency, and packet loss rate. Node To node At any moment The link quality evaluation value is expressed as follows: (3) And satisfy: (4) In the formula, Represents a node To node At any moment The link quality evaluation value below; This represents the normalized signal-to-noise ratio value; Indicates message success rate; This represents the normalized value of the communication delay; Indicates packet loss rate; , , and The evaluation parameters corresponding to each communication indicator are all non-negative numbers. Since an increase in signal-to-noise ratio and message success rate usually indicates an improvement in communication status, while an increase in communication delay and packet loss rate indicates a deterioration in communication status, Equation (3) uses positive and negative terms to fuse the results, so that an increase in the link quality evaluation value uniformly corresponds to an improvement in link communication quality. Each evaluation parameter can be predetermined based on the distinguishing ability of each communication indicator under historical normal and abnormal communication states, and remains unchanged within the same evaluation period.

[0027] Link quality evaluation value Below the preset link quality threshold (Right now The HPLC link is identified as an abnormal HPLC link. The link quality threshold is a preset link quality threshold used to distinguish between normal communication links and abnormal HPLC links. It can be determined based on the distribution of link quality evaluation values ​​during normal operation of the low-pressure station and the range of link quality evaluation values ​​under historical communication abnormal conditions.

[0028] S1. Based on the electrical topology, identify multiple associated nodes corresponding to the abnormal HPLC link, determine the corresponding comprehensive interference score based on the communication interference characteristics of each associated node, and determine the candidate interference source node based on the comprehensive interference score. HPLC communication interference can propagate along low-voltage power lines and their branches to other nodes. Therefore, the endpoints of abnormal HPLC links may be interference-generating nodes or simply nodes affected by interference propagation. To avoid directly identifying the interference source based on the endpoints of abnormal links, this step uses the abnormal HPLC links as a basis to determine multiple associated nodes participating in the interference analysis based on the electrical topology of the low-voltage distribution network. The communication interference characteristics of each associated node are obtained, and candidate interference source nodes are screened based on the communication disturbance status of each associated node.

[0029] S11. Based on the two ends of the abnormal HPLC link, determine the associated nodes according to the electrical topology. For any abnormal HPLC link, the two end nodes of the abnormal HPLC link are used as the starting nodes for electrical topology search. Nodes electrically associated with the abnormal HPLC link are determined based on the electrical connection relationships and branch affiliation relationships between nodes in the low-voltage distribution network. In one embodiment, the associated nodes include the two end nodes of the abnormal HPLC link and adjacent nodes located on the same electrical branch as the end nodes. Depending on the branch structure of the low-voltage distribution network, nodes within a preset electrical range can also be extended upstream and downstream along the electrical branch where the abnormal HPLC link is located. For distributed photovoltaic (PV) grid-connected scenarios, when a PV grid-connected node is located on the electrical branch where the abnormal HPLC link is located or is in an adjacent electrical position to the abnormal HPLC link, the corresponding PV grid-connected node is included in the associated node range.

[0030] like Figure 2 As shown, with an edge gateway or concentrator as the central coordination node, the low-voltage power distribution network includes branch 1 and branch 2. Nodes A, B, and C are set in branch 1, and node D is connected at the electrical connection point between nodes A and B. Node D is a photovoltaic grid-connected node. Nodes E and F are set in branch 2. Taking a communication anomaly in the HPLC link between nodes B and C as an example, the HPLC link between nodes B and C is identified as the abnormal HPLC link, and nodes B and C are used as the starting nodes for electrical topology search. Based on the electrical connection relationship and branch affiliation relationship between nodes, node A, which is on the same electrical branch as the abnormal HPLC link, and the photovoltaic grid-connected node D, which is in an adjacent electrical position to the abnormal HPLC link, are included in the scope of associated nodes. Therefore, in this embodiment, the associated nodes corresponding to the abnormal HPLC link include nodes A, B, C, and D. Nodes E and F are located in branch 2 and do not participate in the interference analysis of the current abnormal HPLC link within the scope of associated nodes determined in this embodiment.

[0031] Therefore, the determination of associated nodes is based on the actual electrical connection relationship of the low-voltage power distribution network, so that the subsequent screening of candidate interference sources and the location of interference sources can be carried out within the range of nodes that have a propagation association with the abnormal HPLC link, rather than determining the analysis object solely based on the logical adjacency relationship on the HPLC communication path.

[0032] S12. The communication interference characteristics of each associated node are positiveized and normalized, and then fused to obtain a comprehensive interference score. The associated nodes that meet the preset scoring conditions are identified as candidate interference source nodes. Different communication metrics reflect the degree of interference in HPLC communication from aspects such as signal attenuation, noise status, and message transmission results. Among these, noise power spectral density, packet loss rate, and communication delay typically increase with the degree of communication interference, while the signal-to-noise ratio decreases. Furthermore, different communication metrics have different dimensions and numerical ranges; directly fusing these values ​​can easily lead to larger-scale metrics having a significant impact on the evaluation results. Therefore, this embodiment first performs positive transformation and normalization on the communication interference characteristics of each associated node, enabling different communication interference characteristics to participate in the interference degree evaluation under a unified numerical scale and direction of change.

[0033] Let the number of associated nodes corresponding to the current abnormal HPLC link be . The node sequence number of the associated node is The aforementioned HPLC link channel response, carrier signal amplitude attenuation, and interfered frequency band all primarily correspond to the HPLC link, while this step uses associated nodes as the object of interference degree evaluation. Therefore, for associated nodes... The HPLC link directly connected to the associated node and located within the current associated node's range is designated as the associated communication link for that node. When the associated node... When there is only one associated communication link, the communication interference characteristics of the corresponding node are determined based on the communication status of that associated communication link; when the associated node... When dealing with multiple associated communication links, the maximum carrier signal amplitude attenuation in each associated communication link is taken as the carrier signal amplitude attenuation of that node, and the union bandwidth of the interfered frequency bands of each associated communication link is taken as the interfered frequency band width of that node. Furthermore, the noise power spectral density, signal-to-noise ratio, packet loss rate, and communication delay are determined based on the communication data of that node within the current sampling window. This process uniformly converts the link-level communication state into the node-level communication interference characteristics required for subsequent comprehensive interference scoring.

[0034] For associated nodes At any moment The communication interference characteristics are represented as follows: (5) In the formula, Indicates associated nodes At any moment Lower communication interference characteristics; This indicates the amount of carrier signal amplitude attenuation; Indicates the bandwidth affected by interference; Indicates the noise power spectral density; Indicates the signal-to-noise ratio; Indicates packet loss rate; Indicates communication delay.

[0035] Among these, the carrier signal amplitude attenuation reflects the degree of attenuation of the HPLC carrier signal during power line transmission; the interference bandwidth reflects the impact of communication interference across the frequency range; the noise power spectral density reflects the noise level in the current node's communication environment; the signal-to-noise ratio reflects the relative strength of the effective carrier signal to the noise; and the packet loss rate and communication delay reflect the impact of communication interference on message transmission results. Through these communication interference characteristics, the interference status of associated nodes can be characterized from different aspects, including signal propagation, frequency domain noise, and communication service performance.

[0036] It should be noted that the communication interference features described in equation (5) are mainly used to characterize the current communication interference status of associated nodes and to provide communication status data for the comprehensive interference score. In the subsequent interference type discrimination process, communication status information such as spectrum distribution, HPLC link channel response, propagation delay, and message retransmission status obtained during the sampling process are also combined according to the discrimination needs of the corresponding interference type.

[0037] The operating status of the equipment itself and the communication interference characteristics are recorded separately. For photovoltaic inverter nodes, the inverter switching frequency, grid-connected current harmonic status, and output power changes are obtained; for load nodes, the load switching status and reactive power changes are obtained. The above data serves as the equipment operating characteristics of the corresponding nodes, which is used to subsequently correlate the communication interference characteristics of the interference source nodes with the equipment operating characteristics to determine the type of interference, rather than being directly used as evaluation items for the comprehensive interference score in this step.

[0038] In one implementation, noise power spectral density, signal-to-noise ratio (SNR), packet loss rate, and communication delay, which can be uniformly obtained across different types of associated nodes, are selected to determine the comprehensive interference score. The carrier signal amplitude attenuation and the affected bandwidth are retained as communication interference characteristics to further characterize the specific performance of the interference in signal attenuation and frequency range. For noise power spectral density, packet loss rate, and communication delay, an increase in their values ​​corresponds to an increase in the degree of communication interference; therefore, they are normalized according to their respective reference ranges. For SNR, an increase in its value corresponds to an improvement in communication conditions; therefore, the normalized SNR is reversed so that all the processed evaluation features conform to the unified direction of increasing communication interference as their values ​​increase.

[0039] Based on the positively normalized and normalized communication interference characteristics, associated nodes The overall interference score is expressed as follows: (6) In the formula, Indicates associated nodes At any moment The overall interference score is as follows; , , and These represent the normalized reference values ​​for noise power spectral density, packet loss rate, communication delay, and signal-to-noise ratio, respectively. , , and Let represent the fusion parameters corresponding to noise power spectral density, packet loss rate, communication delay, and signal-to-noise ratio, respectively. All of these are non-negative and satisfy the following conditions: (7) The normalized reference values ​​are determined based on the normal operating range of the HPLC communication equipment, preset communication performance boundaries, and the value range corresponding to historical operating data. Each fusion parameter is used to adjust the influence of different communication interference characteristics on the overall interference score. These parameters are predetermined based on the ability of each communication indicator to distinguish the disturbed state in historical communication interference events and remain unchanged within the same analysis cycle.

[0040] It should be noted that the interference comprehensive score characterizes the degree of communication interference currently experienced by associated nodes, but does not directly characterize the likelihood of that associated node generating communication interference. Since HPLC communication interference can propagate along power lines, when one node generates interference, other electrically associated nodes may also exhibit high interference comprehensive scores. Therefore, directly identifying the associated node with the highest interference comprehensive score as the interference source may misclassify nodes with a high degree of interference as the actual interference source node.

[0041] Therefore, this step only uses the interference comprehensive score to screen the associated nodes and determines the associated nodes that meet the preset scoring conditions as candidate interference source nodes, instead of directly determining the final interference source node in this step.

[0042] In one implementation, the preset scoring criteria are expressed as: (8) in, This indicates the preset scoring threshold, which is determined based on the comprehensive interference score distribution of each node under normal operating conditions in the low-voltage distribution area and the scoring range under confirmed communication interference conditions.

[0043] Nodes that meet the preset scoring criteria are identified as candidate interference source nodes, and the node indices corresponding to all candidate interference source nodes form a set of candidate interference source nodes, denoted as . .

[0044] Through the above screening, the analysis object for subsequent interference source localization is narrowed down from all associated nodes to candidate interference source nodes. At the same time, the comprehensive interference scores of multiple associated nodes are retained, providing a data foundation for further interference source localization by combining the electrical distance between candidate interference source nodes and multiple associated nodes.

[0045] S2. Based on the distribution of disturbance degree reflected by the comprehensive interference score of multiple associated nodes, and the electrical distance relationship between each candidate interference source node and multiple associated nodes, determine the interference source node from the candidate interference source nodes. Interference comprehensive scoring can screen out candidate interference source nodes with high communication interference levels from multiple associated nodes. However, interference comprehensive scoring reflects the current degree of communication interference a node is experiencing and cannot directly characterize the likelihood that the interference is caused by that node. In HPLC communication, interference can propagate along low-voltage power lines to adjacent nodes and other nodes on the same branch. Therefore, even if a node has a high interference comprehensive score, it may only be located in a position where interference propagation is most intense. If only the interference comprehensive score of the candidate interference source node is used for sorting, it is easy to identify the node with the highest degree of interference as the interference source node, rather than using the overall interference distribution formed by multiple associated nodes for judgment. Therefore, this embodiment further introduces the electrical distance between the candidate interference source node and multiple associated nodes, so that the location result of the candidate interference source node is simultaneously constrained by the interference level of the associated nodes and the electrical positional relationship.

[0046] In this embodiment, the actual electrical connection path between two nodes is determined based on the electrical topology of the low-voltage distribution network. The sum of the impedance magnitudes of each line segment in the actual electrical connection path is used as the original electrical distance between the two nodes, and then normalized according to a unified reference electrical distance within the current associated node range to obtain a dimensionless electrical distance for interference source localization. The following... Both represent the normalized electrical distance obtained in the manner described above. For example, combined with... Figure 2 When node B is identified as a candidate interference source node, the corresponding electrical distances are determined based on the electrical connection paths from node B to nodes A, B, C, and D, respectively. When other associated nodes are identified as candidate interference source nodes, the electrical distances between the candidate interference source node and each associated node are determined in the same way.

[0047] For the set of candidate interference source nodes For each candidate interference source node in the set, if the set of candidate interference source nodes contains only one candidate interference source node, then the candidate interference source node is determined as the interference source node; if there are multiple candidate interference source nodes, then the interference source node is determined according to step S21.

[0048] S21. When there are multiple candidate interference source nodes, for each candidate interference source node, the interference location confidence is determined based on the electrical distance between it and multiple associated nodes and the comprehensive interference score of each associated node, and the interference source node is determined based on the interference location confidence. When multiple candidate interference source nodes exist, each candidate interference source node is treated as the node to be evaluated. The electrical distance between the candidate interference source node and multiple associated nodes, as well as the comprehensive interference score of the corresponding associated nodes, are examined. For a candidate interference source node, if it has a close electrical distance to multiple associated nodes with high comprehensive interference scores, then the candidate interference source node has a high consistency with the current disturbance distribution formed by multiple nodes. Conversely, if a candidate interference source node has a high comprehensive interference score, but its electrical distance to other associated nodes with high comprehensive interference scores is large, then this node is more likely to be affected by interference propagation, and its credibility as an interference source node is correspondingly reduced.

[0049] Therefore, this embodiment does not evaluate each candidate interference source node in isolation, but takes each candidate interference source node as the center and uses the comprehensive interference score of multiple related nodes and their electrical distance relationship to perform multi-node collaborative judgment.

[0050] S211, The interference location confidence is determined based on the comprehensive interference score of each associated node and the electrical distance attenuation relationship between each associated node and the candidate interference source node; Let the node number of the candidate interference source node be . For candidate interference source nodes Its interference location reliability is expressed as: (9) In the formula, Indicates candidate interference source nodes At any moment Interference location reliability; Indicates the overall interference score; Indicates candidate interference source nodes Associated nodes The electrical distance between them after normalization.

[0051] In equation (9) This is used to characterize the attenuation relationship of electrical distance during interference localization. When an associated node is close to a candidate interference source node, the corresponding distance attenuation term is larger, and the overall interference score of this associated node has a stronger effect on the localization result of the candidate interference source node. As the electrical distance increases, the corresponding effect gradually weakens. Therefore, associated nodes with higher overall interference scores and closer electrical positions to the candidate interference source node provide greater support for the localization of the candidate interference source node.

[0052] It should be noted that the electrical distance in equation (9) is used to describe the relative electrical positional relationship between the candidate interference source node and multiple associated nodes, rather than using the electrical distance alone to determine the interference source. Even if the electrical distance between a candidate interference source node and multiple associated nodes is relatively close, if these associated nodes themselves do not show obvious communication interference, they will not obtain a high interference location confidence simply because of the close distance; conversely, if a single associated node has a high interference comprehensive score, it is also necessary to combine its electrical distance with the candidate interference source node in the judgment.

[0053] After calculating the interference localization confidence for each candidate interference source node, the interference source node is determined based on the magnitude of the interference localization confidence. In one implementation, the candidate interference source node with the highest interference localization confidence is selected from the set of candidate interference source nodes as the interference source node, which is represented as follows: (10) In the formula, The node number representing the identified interference source node; The node number representing the candidate interference source node; Represents the set of candidate interference source nodes; Indicates candidate interference source nodes At any moment The location reliability of the interference.

[0054] Through the above processing, the determination of the interference source node no longer depends on the communication abnormality of a single node, but rather on the distribution of the degree of interference formed by multiple associated nodes and the electrical distance relationship between the candidate interference source node and each associated node. This allows for the differentiation between the interfered node and the interference source node when multiple nodes are simultaneously subjected to communication interference.

[0055] S3. Associate the communication interference characteristics of the interference source node with the equipment operation characteristics to determine the interference type and perform corresponding HPLC communication interference suppression. Different types of HPLC communication interference may exhibit similar phenomena such as decreased signal-to-noise ratio, increased packet loss rate, or increased communication delay. It is difficult to determine the cause of the interference solely based on the degree of communication anomaly. Different interference types have different characteristics in frequency distribution, temporal variation, and their relationship with the corresponding equipment operating status. Therefore, in this embodiment, after identifying the interference source node, the communication interference characteristics of the source node are correlated with the equipment operating characteristics of the corresponding device according to a unified sampling time benchmark to determine the type of interference causing the current HPLC communication anomaly, and corresponding HPLC communication adjustments are performed based on the interference type.

[0056] The correlation includes cases where there is a stable time-domain or frequency-domain correspondence between communication interference characteristics and equipment operation characteristics, as well as cases where there is no stable correspondence between the two. For interference directly caused by the operating status of node equipment, identification is based on the correspondence between communication anomalies and changes in equipment operation; for multipath reflection interference, communication congestion interference, and external narrowband noise interference, the state where communication interference characteristics change significantly but equipment operation characteristics do not change synchronously is used as one of the criteria for determining the type of interference.

[0057] S31. Associate the communication interference characteristics of the interference source node with the equipment operation characteristics to determine the type of interference; For the interference source node, its communication interference characteristics are time-aligned with the corresponding device operation characteristics within the same sampling window, and the correspondence between the two in terms of change time, change trend and frequency position is analyzed.

[0058] Specifically, the communication interference characteristics are the carrier signal amplitude attenuation, the interference bandwidth, the noise power spectral density, the signal-to-noise ratio, the packet loss rate, and the communication delay described in equation (5). When different types of interference are identified, the spectrum distribution, HPLC link channel response, propagation delay, and message retransmission status of the interference source node are further combined according to the identification requirements of the corresponding interference type. Among them, the spectrum distribution is determined based on the carrier signal amplitude and noise power spectral density at different communication frequencies; the HPLC link channel response is the link channel response described in equation (1), and its change status is determined by comparing the link channel responses of adjacent sampling windows; the propagation delay is the propagation delay corresponding to each propagation path in equation (1); and the message retransmission status is determined based on the number of retransmissions in the current sampling window.

[0059] The operating characteristics of the equipment are determined based on the type of equipment corresponding to the interference source node. For photovoltaic inverter nodes, the operating characteristics include inverter switching frequency, grid-connected current harmonic status, and output power variation; for load nodes, the operating characteristics include load switching status, reactive power variation, and corresponding voltage and current operating status.

[0060] The communication interference characteristics of the interference source node are matched with the equipment operation characteristics of the corresponding device according to the sampling time. Based on the need to identify the corresponding interference type, the interference type is further identified by combining the aforementioned spectrum distribution, HPLC link channel response, propagation delay or message retransmission status.

[0061] After associating communication interference characteristics with equipment operation characteristics, the communication interference characteristics and equipment operation characteristics are matched with preset feature templates corresponding to different interference types. For interference types that require further analysis based on spectral distribution, HPLC link channel response, propagation delay, or message retransmission status, the corresponding information is used for matching the preset feature templates. The interference type set in this embodiment includes photovoltaic inverter switching interference, impedance change interference, multipath reflection interference, communication congestion interference, and external narrowband noise interference.

[0062] For each type of interference, a corresponding preset feature template is set. When performing template matching, the communication interference features and equipment operation features are normalized. When the corresponding interference type also needs to be judged in conjunction with the spectrum distribution, HPLC link channel response, propagation delay, or message retransmission status, the corresponding information is normalized according to the corresponding normal operation range, and the normalized current value is compared with the reference value in the corresponding preset feature template. The template distance for the corresponding interference type is determined by the square root of the sum of the squares of the normalized differences.

[0063] Define the type of interference The corresponding template distance is In one implementation, the matching probability corresponding to each interference type is determined by a normalized exponential function based on the template distance corresponding to each interference type, expressed as: (11) In the formula, Indicates time Communication interference characteristics, equipment operation characteristics, and interference types The matching probability of the corresponding preset feature template; Represents the set of interference types Any type of interference in the data; Indicates communication interference characteristics, equipment operation characteristics, and interference types. Template distance between corresponding preset feature templates; Represents the set of interference types The types of interference involved in the normalization calculation; Indicates the type of interference The corresponding template distance.

[0064] For interference types that require further analysis based on spectral distribution, HPLC link channel response, propagation delay, or message retransmission status, template matching is performed by combining the relevant information with communication interference characteristics and equipment operation characteristics when calculating the corresponding template distance.

[0065] Because the smaller the template distance, the better. The larger the value of , the higher the matching probability determined by equation (11), indicating that the communication interference characteristics and equipment operation characteristics are closer to the preset feature template of the corresponding interference type.

[0066] The current interference type is determined based on the matching probability corresponding to each interference type, and is expressed as follows: (12) In the formula, This indicates a specific type of interference.

[0067] For photovoltaic inverter switching interference, the focus is on analyzing the correlation between the communication interference characteristics of the interference source node and the corresponding equipment operating characteristics, combined with the correspondence between communication spectrum anomalies and inverter switching frequencies. The spectral components generated by inverter switching operations are typically concentrated in the switching frequency and its harmonic neighborhood. The secondary switching harmonic frequency is expressed as: (13) In the formula, Indicates the first Secondary switching harmonic frequency; This indicates the switching frequency of the inverter corresponding to the interference source node; Indicates the switching harmonic order; This indicates the maximum number of switching harmonics involved in interference type discrimination.

[0068] When the communication interference characteristics characterize the communication disturbance state, accompanied by spectral peaks in the communication spectrum, concentrated at the inverter switching frequency... When the switching harmonic frequency neighborhood is determined by equation (13), and the equipment operation characteristics indicate that the grid-connected current harmonic content is increasing, and the output power change and the communication interference degree change are corresponding in time, the communication interference characteristics and equipment operation characteristics have a small template distance with the preset characteristic template of photovoltaic inverter switching interference, thereby obtaining a higher photovoltaic inverter switching interference matching probability.

[0069] For impedance abrupt interference, the judgment is based on the time correspondence between the communication interference characteristics of the interference source node and the equipment operation characteristics, and further combined with the changes in the HPLC link channel response between adjacent sampling windows. When the equipment operation characteristics indicate that the equipment corresponding to the interference source node has undergone load switching, on-grid / off-grid status switching, or other operational status changes that cause changes in line impedance, and at the same time the communication interference characteristics indicate that the communication status of the corresponding node has changed significantly, and the corresponding HPLC link channel response has changed significantly, the communication interference characteristics and equipment operation characteristics have a high degree of matching with the preset feature template corresponding to impedance abrupt interference, thus obtaining a high impedance abrupt interference matching probability; For multipath reflection interference, the correlation between the communication interference characteristics of the interference source node and the equipment operation characteristics is first used to determine whether the current communication anomaly has a stable correspondence with the corresponding changes in the equipment's operating state. This is further combined with the signal attenuation and propagation delay of different propagation paths at the same communication frequency. When the communication interference characteristics indicate that the node is in a state of significant communication disruption, and there is a significant delay spread between different propagation paths, while the equipment operation characteristics do not show significant changes synchronized with the communication anomaly, the communication interference characteristics and the equipment operation characteristics have a high degree of matching with the preset feature template corresponding to multipath reflection interference, thus obtaining a high multipath reflection interference matching probability. For communication congestion interference, the judgment is based on the correlation between the communication interference characteristics of the interference source node and the device operation characteristics, combined with the message retransmission status within the current sampling window. When the communication interference characteristics indicate that the signal-to-noise ratio changes slightly, while the packet loss rate and communication delay increase significantly, and the number of retransmissions increases, and the device operation characteristics do not have any synchronization anomalies that can explain the changes in the communication state, the communication interference characteristics and the device operation characteristics have a high degree of matching with the preset feature template corresponding to the communication congestion interference, thus obtaining a high probability of matching the communication congestion interference. For external narrowband noise interference, the correlation between the communication interference characteristics of the interference source node and the equipment operation characteristics is used for judgment, combined with the distribution of noise power spectral density at different communication frequencies. When the communication interference characteristics indicate that the noise power spectral density within a fixed narrowband continuously increases, and there is no stable correspondence between the equipment operation characteristics and the noise changes within the fixed narrowband, the communication interference characteristics and the equipment operation characteristics have a high degree of matching with the preset feature templates corresponding to the external narrowband noise interference, thus obtaining a high matching probability for external narrowband noise interference.

[0070] In the above manner, the communication interference characteristics of the interference source node are associated with the equipment operation characteristics of the corresponding device. For different interference types, template matching is further performed by combining the corresponding spectrum distribution, HPLC link channel response, propagation delay or message retransmission status. According to the matching probability corresponding to each interference type, the current interference type is determined according to Equation (12). Among them, for communication interference directly related to the node equipment operation status, it is identified by the correspondence between the communication disturbance status and the equipment operation status; for communication interference not directly caused by the equipment operation status, such as multipath reflection interference, communication congestion interference and external narrowband noise interference, the significant change in communication interference characteristics without corresponding synchronous change in equipment operation characteristics is used as one of the criteria for judgment.

[0071] S32. Determine the corresponding HPLC communication adjustment method according to the type of interference, and determine the adjustment range of the HPLC communication adjustment method according to the communication interference characteristics; perform communication adjustment according to the HPLC communication adjustment method, and reacquire the communication interference characteristics of the associated node after adjustment; Different types of interference affect different targets in HPLC communication. Photovoltaic inverter switching interference and external narrowband noise interference mainly manifest as significant interference within specific frequency ranges; impedance abrupt change interference, multipath reflection interference, and communication congestion interference mainly manifest as a degradation in communication quality at local nodes or along the HPLC link. Therefore, this embodiment determines the HPLC communication adjustment method based on the type of interference and uses communication interference characteristics to determine the frequency range or communication path range requiring adjustment.

[0072] After the communication adjustment is executed, the HPLC communication status data of each associated node is reacquired in the subsequent sampling window according to the same data acquisition method as before the adjustment, and the communication interference characteristics are re-determined according to Equation (5) so that the communication interference status before and after the adjustment has a unified basis for comparison.

[0073] S321, The HPLC communication adjustment method includes at least one of communication frequency adjustment and communication path adjustment; When the interference type corresponds to photovoltaic inverter switching interference or external narrowband noise interference, communication frequency adjustment is performed to reduce the interference impact by avoiding the frequency range where communication interference is concentrated. When the interference type corresponds to impedance change interference, multipath reflection interference, or communication congestion interference, communication path adjustment is performed to reduce the impact of the interference location on the communication process by changing the nodes and links through which the HPLC data passes. When the current communication interference has both obvious interference frequency band and local HPLC link anomaly characteristics, the communication frequency adjustment range and communication path adjustment range are determined respectively, and both communication frequency adjustment and communication path adjustment are performed simultaneously.

[0074] S322, The communication frequency adjustment includes: determining the interference frequency band based on the communication interference characteristics, determining candidate communication frequency points outside the interference frequency band, and determining the target communication frequency point based on the comprehensive evaluation results of the candidate communication frequency points; The interference frequency band is determined based on the noise power spectral density and carrier signal amplitude attenuation at each communication frequency. The continuous frequency range where the noise power spectral density exceeds a preset noise threshold or the carrier signal amplitude attenuation exceeds a preset attenuation threshold is determined as the interference frequency band. For photovoltaic inverter switching interference, the frequency range near the inverter switching frequency and the switching harmonic frequency determined by equation (13) that meets the above-mentioned disturbance conditions is included in the interference frequency band; for external narrowband noise interference, the fixed narrowband where the noise power spectral density continuously increases is included in the interference frequency band.

[0075] Available HPLC communication frequencies outside the interference band were identified as candidate communication frequencies. Since there are still differences in carrier signal strength, noise power spectral density, and link attenuation among the candidate communication frequencies, this embodiment performs a comprehensive evaluation after standardizing these indicators.

[0076] Specifically, evaluation values ​​are determined based on the carrier signal intensity, noise power spectral density, and link channel response of the current HPLC link at each candidate communication frequency. These values ​​are then normalized according to preset reference ranges for each evaluation indicator, ensuring that different evaluation indicators participate in the candidate communication frequency evaluation on a unified numerical scale. The target communication frequency is represented as: (14) In the formula, Indicates the target communication frequency; Represents the set of candidate communication frequency points; Indicates candidate communication frequency points The carrier signal strength after normalization; Indicates candidate communication frequency points The noise power spectral density after normalization; Indicates candidate communication frequency points The amplitude attenuation of the carrier signal after normalization; , and These are the evaluation parameters corresponding to carrier signal strength, noise power spectral density, and carrier signal amplitude attenuation, respectively, and are all non-negative numbers. The evaluation parameters are predetermined based on the ability of each candidate communication frequency point evaluation index to distinguish communication quality under historical normal communication conditions and confirmed communication interference conditions, and remain unchanged during the same communication frequency point adjustment process.

[0077] Increasing carrier signal strength improves HPLC communication margin and is therefore considered a positive evaluation factor. Conversely, increasing noise power spectral density and carrier signal amplitude attenuation both reduce HPLC communication reliability and are therefore considered negative evaluation factors. This comprehensive evaluation avoids selecting a frequency point based solely on a single communication metric, which could result in the adjusted communication frequency remaining in a high-noise or high-attenuation state. Once the target communication frequency is determined, the current HPLC communication frequency is adjusted to that target frequency.

[0078] S323, The communication path adjustment includes: determining candidate communication paths based on interference source nodes and abnormal HPLC links, and determining the target communication path based on the equivalent link quality of the HPLC links in each candidate communication path; Based on the HPLC communication topology, a communication path that satisfies the communication connectivity condition between the sending node and the target receiving node of the current communication service is determined, and candidate communication paths are determined in conjunction with interference source nodes and abnormal HPLC links. The candidate communication paths consist of reachable communication links between existing HPLC communication nodes, without adding new physical communication nodes or communication lines. If path selection is based solely on the link quality evaluation value determined by equation (3), paths with high communication quality but passing through interference source nodes or abnormal HPLC links may still be selected. Therefore, in this embodiment, based on the link quality evaluation value, each HPLC link is corrected according to the interference source nodes and abnormal HPLC links.

[0079] It should be noted that the correction does not change the link quality evaluation value obtained through actual communication status data. Instead, it introduces a penalty amount corresponding to the interference source node and abnormal HPLC link based on the link quality evaluation value, so as to reduce the priority of candidate communication paths passing through continuously interfered locations in the path selection process.

[0080] Specifically, nodes With nodes The equivalent link quality of the HPLC link between them is expressed as: (15) In the formula, Represents a node With nodes The HPLC link between time Equivalent link quality under the following conditions; This represents the link quality evaluation value; and Representing nodes respectively and nodes The corresponding node penalty amount; Represents a node With nodes Link penalty amount corresponding to the HPLC link; , and These represent the evaluation parameters corresponding to each correction item, and are all non-negative numbers. The evaluation parameters are used to adjust the degree of correction of the equivalent link quality by the node penalty and link penalty, and their values ​​are predetermined based on the numerical range of the link quality evaluation value and the impact of the degree of interference on the path selection results under historical communication interference conditions.

[0081] The node penalty is determined based on the relationship between the corresponding node and the interference source node, while the link penalty is determined based on the communication interference status of the corresponding HPLC link. Interference source nodes and nodes within their preset electrical proximity range correspond to larger node penalties, and abnormal HPLC links correspond to larger link penalties. As the correlation between a node or link and the current communication interference range decreases, the corresponding penalty decreases. When the interference source node itself is the transmitting node or target receiving node of the current communication service, the transmitting node or target receiving node is not excluded using the node penalty; instead, the impact of communication interference is reduced by adjusting relay nodes, abnormal HPLC links, or communication frequencies.

[0082] Considering that the number of HPLC links contained in different candidate communication paths may vary, directly summing or multiplying the evaluation values ​​of each link would further affect the path evaluation result due to the number of links. Therefore, this embodiment compares different candidate communication paths based on the average equivalent link quality of each HPLC link in the candidate communication path. The target communication path is represented as: (16) In the formula, Indicates the target communication path; Represents the set of candidate communication paths; Indicate candidate communication paths The set of HPLC links included; Indicate candidate communication paths The number of HPLC links included.

[0083] By calculating the average equivalent link quality of each HPLC link in the candidate communication path, the path evaluation results mainly reflect the overall communication status of each link after interference location correction, thus reducing the direct impact of the different number of links in the candidate communication path on the path comparison results.

[0084] For impedance abrupt interference, the penalty amount for the neighboring region of the interference source node and the penalty amount for the abnormal HPLC link are increased to reduce the area affected by impedance abrupt interference for the target communication path. For multipath reflection interference, when forming candidate communication paths, the bypass path with smaller delay spread is preferentially retained according to the delay spread state of each HPLC link, and then the average equivalent link quality of each candidate communication path is compared according to Equation (16). For communication congestion interference, the penalty amount for the HPLC link with high communication delay and high packet loss rate is increased to reduce the equivalent link quality determined by Equation (15), thereby reducing the possibility that the candidate communication path containing the persistent congestion link is determined as the target communication path. After determining the target communication path, the current HPLC communication path is adjusted to the target communication path.

[0085] S324. Determine the suppression effect based on the changes in the communication interference characteristics of the associated nodes before and after the adjustment, and further adjust the communication when the suppression effect does not meet the preset conditions; The photovoltaic output power, load status, and line impedance of low-voltage distribution areas are in a dynamic process. After a communication frequency or communication path adjustment, the impact of communication interference on multiple associated nodes may still change. Therefore, in this embodiment, the comprehensive interference score of each associated node is re-determined within the sampling window after the communication adjustment is completed, and the actual suppression effect is evaluated based on the changes in the scores of multiple associated nodes before and after the adjustment.

[0086] Based on the time of each associated node The overall interference score is used to determine the average overall interference score of each associated node, expressed as: (17) In the formula, Indicates time The average interference score of multiple associated nodes.

[0087] The sampling window before the HPLC communication adjustment is denoted as... The sampling window after communication adjustment is denoted as The inhibitory effect is then expressed as: (18) In the formula, This indicates the suppression effect of HPLC communication interference; This represents the average overall interference score before the communication adjustments were implemented; This represents the average overall interference score after communication adjustments have been implemented.

[0088] Let the preset suppression effect threshold be . The preset suppression effect threshold is determined based on the range of change in the average comprehensive interference score before and after adjustment under the confirmed effective interference suppression state.

[0089] when When the current inhibition effect meets the preset conditions, maintain the currently executed HPLC communication adjustment results, and record the corresponding interference type, interference source node, and current communication adjustment parameters. If the current suppression effect does not meet the preset conditions, the type of interference that is still not effectively suppressed is re-evaluated based on the communication interference characteristics of each associated node after adjustment, and the HPLC communication adjustment method is re-determined accordingly.

[0090] When the adjusted communication anomalies are still mainly manifested as high noise power spectral density or significant carrier signal attenuation within the affected frequency band, the search range of candidate communication frequencies is expanded, and the target communication frequency is re-determined according to equation (14). When the adjusted communication anomalies are still mainly concentrated in the vicinity of the interference source node or the abnormal HPLC link, the corresponding node penalty and link penalty are adjusted, and the target communication path is re-determined according to equations (15) and (16). When there is still a high packet loss rate and retransmission count after communication adjustment, the retransmission parameter adjustment level of the corresponding affected HPLC link is increased. Different retransmission parameter adjustment levels correspond to different maximum retransmission counts, confirmation waiting time, backoff window, or retransmission interval; when the adjustment level is increased, the message retransmission capability of the affected HPLC link is correspondingly improved.

[0091] S3241. When the inhibition effect does not meet the preset conditions and the communication abnormality is still concentrated in local nodes or HPLC links, adjust the node penalty amount and the link penalty amount. The node penalty and link penalty are used to further reduce the selection priority of candidate communication paths for nodes or HPLC links that are continuously affected by communication interference, without changing the actual link quality evaluation value. When the suppression effect after a communication path adjustment still does not meet the preset conditions, the corresponding penalty in equation (15) is updated according to the nodes and HPLC links where communication anomalies are still concentrated after adjustment.

[0092] Let the number of closed-loop adjustments be... For nodes still located within the area of ​​concentrated communication anomalies The node penalty is expressed as: (19) In the formula, Indicates the first Second closed-loop adjustment node The amount of node penalty; Indicates the upper limit of the node penalty amount; This represents the preset adjustment amount for the node penalty.

[0093] For nodes that are still significantly disturbed after adjustment With nodes The HPLC link between them, and the link penalty is expressed as: (20) In the formula, Indicates the first Second closed-loop adjustment node With nodes Link penalty amount in HPLC links; Indicates the upper limit of the link penalty amount; The preset adjustment amount represents the link penalty amount. The node penalty amount upper limit, the link penalty amount upper limit, and the corresponding preset adjustment amount are predetermined based on the range of link quality evaluation values ​​during normal operation of the low-voltage distribution area and under historical communication anomaly conditions; wherein, the node penalty amount upper limit and the link penalty amount upper limit are used to limit the maximum value of the corresponding penalty amount during the closed-loop adjustment process, and the preset adjustment amount is used to control the increase of the corresponding penalty amount between two adjacent closed-loop adjustments.

[0094] As the node penalty increases, the equivalent link quality of the HPLC link associated with the corresponding node, as determined by Equation (15), decreases; as the link penalty increases, the equivalent link quality of the corresponding interfered HPLC link further decreases. Therefore, when comparing candidate communication paths again according to Equation (16), the selection priority of candidate communication paths containing the above-mentioned nodes or HPLC links decreases, so that the re-determined target communication path gradually avoids the position continuously affected by communication interference.

[0095] When the suppression effect obtained through subsequent communication adjustments meets the preset conditions, the increase in the corresponding node penalty and link penalty amount stops, and the current communication adjustment result is maintained. When the suppression effect still does not meet the preset conditions, the next closed-loop adjustment is performed in the same manner until the suppression effect meets the preset conditions or the corresponding penalty amount reaches the preset upper limit. Through the above feedback processing, the HPLC communication interference suppression is continuously corrected according to the actual communication status changes, rather than performing a fixed adjustment based solely on the initially identified interference type. This allows interference localization, type identification, communication adjustment, and suppression effect evaluation to form a complete closed-loop processing procedure.

[0096] Example 2 This embodiment provides an HPLC communication interference localization and suppression system for performing the HPLC communication interference localization and suppression method described in Embodiment 1. Figure 3 As shown, the HPLC communication interference localization and suppression system includes a candidate interference source determination module, an interference source localization module, and an interference identification and suppression module.

[0097] The candidate interference source determination module is used to determine multiple associated nodes corresponding to the abnormal HPLC link based on the electrical topology of the low-voltage distribution network, obtain the communication interference characteristics of each associated node, perform positive and normalization processing on the communication interference characteristics of each associated node, determine the comprehensive interference score of each associated node, and determine the candidate interference source node from the associated nodes based on the comprehensive interference score.

[0098] The interference source localization module is used to determine the interference source node from the candidate interference source nodes based on the distribution of disturbance levels reflected by the comprehensive interference scores of multiple associated nodes and the electrical distance relationship between each candidate interference source node and the multiple associated nodes. Specifically, when there are multiple candidate interference source nodes, for each candidate interference source node, the interference localization confidence level is determined based on its electrical distance to the multiple associated nodes and the comprehensive interference scores of each associated node, and the interference source node is determined based on the interference localization confidence level.

[0099] The interference identification and suppression module is used to associate the communication interference characteristics of the identified interference source node with the equipment operation characteristics of the corresponding device, determine the interference type based on the association result, and perform corresponding HPLC communication interference suppression based on the interference type.

[0100] Specifically, the interference identification and suppression module determines the HPLC communication adjustment method according to the interference type. The HPLC communication adjustment method includes at least one of communication frequency adjustment and communication path adjustment. After the communication adjustment is completed, the communication interference characteristics of the associated nodes are reacquired. The suppression effect is determined according to the changes in the communication interference characteristics of the associated nodes before and after the adjustment. If the suppression effect does not meet the preset conditions, further communication adjustment is performed.

[0101] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for locating and suppressing communication interference using HPLC, characterized in that, include: Based on the electrical topology, multiple associated nodes corresponding to the abnormal HPLC link are identified, and the corresponding comprehensive interference score is determined based on the communication interference characteristics of each associated node. Candidate interference source nodes are determined based on the comprehensive interference score. The communication interference characteristics include at least one of the following: carrier signal amplitude attenuation, interference bandwidth, noise power spectral density, signal-to-noise ratio, packet loss rate, and communication delay. Based on the distribution of disturbance severity reflected by the comprehensive interference scores of multiple associated nodes, and the electrical distance relationship between each candidate interference source node and multiple associated nodes, the interference source node is determined from the candidate interference source nodes. The communication interference characteristics of the interference source node are correlated with the equipment operation characteristics to determine the type of interference, and the corresponding HPLC communication interference suppression is performed.

2. The HPLC communication interference localization and suppression method according to claim 1, characterized in that, The step of determining the interference source node from the candidate interference source nodes includes: When there are multiple candidate interference source nodes, for each candidate interference source node, the interference location confidence is determined based on the electrical distance between it and multiple associated nodes and the comprehensive interference score of each associated node, and the interference source node is determined based on the interference location confidence.

3. The HPLC communication interference localization and suppression method according to claim 2, characterized in that, The interference location confidence is determined based on the comprehensive interference score of each associated node and the electrical distance attenuation relationship between each associated node and the candidate interference source node.

4. The HPLC communication interference localization and suppression method according to claim 1, characterized in that, The determination of the multiple associated nodes and candidate interference source nodes includes: Based on the two ends of the abnormal HPLC link, the associated nodes are determined according to the electrical topology. The communication interference characteristics of each associated node are positively normalized and fused to obtain a comprehensive interference score. The associated nodes that meet the preset scoring conditions are identified as candidate interference source nodes.

5. The HPLC communication interference localization and suppression method according to claim 1, characterized in that, The execution of corresponding HPLC communication interference suppression includes: The corresponding HPLC communication adjustment method is determined based on the type of interference, and the adjustment range of the HPLC communication adjustment method is determined based on the characteristics of the communication interference. Communication adjustments were made according to the HPLC communication adjustment method, and the communication interference characteristics of the associated nodes were reacquired after the adjustment. The suppression effect is determined based on the changes in the communication interference characteristics of the associated nodes before and after the adjustment, and further communication adjustments are made when the suppression effect does not meet the preset conditions.

6. The HPLC communication interference localization and suppression method according to claim 5, characterized in that, The HPLC communication adjustment method includes at least one of communication frequency adjustment and communication path adjustment; When the communication frequency point corresponding to the interference type is adjusted, the interference frequency band is determined according to the communication interference characteristics; When the communication path corresponding to the interference type is adjusted, a candidate communication path is determined based on the interference source node and the abnormal HPLC link.

7. The HPLC communication interference localization and suppression method according to claim 6, characterized in that, The communication frequency adjustment includes: Available communication frequencies outside the interfered frequency band are identified as candidate communication frequencies. Each candidate communication frequency is comprehensively evaluated, and the target communication frequency is determined based on the evaluation results. The current HPLC communication frequency is then adjusted to the target communication frequency.

8. The HPLC communication interference localization and suppression method according to claim 6, characterized in that, The communication path adjustment includes: Based on the interference source node and the abnormal HPLC link, the link quality evaluation value of each HPLC link in the candidate communication path is corrected to obtain the equivalent link quality. The target communication path is determined based on the equivalent link quality of the HPLC link in each candidate communication path, and the current HPLC communication path is adjusted to the target communication path.

9. The HPLC communication interference localization and suppression method according to claim 5, characterized in that, The process of determining the suppression effect and further adjusting communication when the suppression effect does not meet preset conditions includes: Within the sampling window after HPLC communication interference suppression, the overall interference score of each associated node is re-determined, and the suppression effect is determined based on the change in the overall interference score of each associated node before and after suppression. When the inhibition effect does not meet the preset conditions, the HPLC communication adjustment mode is redefined and communication adjustment is performed.

10. An HPLC communication interference localization and suppression system, characterized in that, include: The candidate interference source determination module is used to determine multiple associated nodes corresponding to the abnormal HPLC link based on the electrical topology relationship, determine the corresponding comprehensive interference score based on the communication interference characteristics of each associated node, and determine the candidate interference source node based on the comprehensive interference score. The interference source localization module is used to determine the interference source node from the candidate interference source nodes based on the distribution of the degree of disturbance reflected by the comprehensive interference score of multiple associated nodes and the electrical distance relationship between each candidate interference source node and multiple associated nodes. The interference identification and suppression module is used to associate the communication interference characteristics of the interference source node with the equipment operation characteristics, determine the interference type, and perform corresponding HPLC communication interference suppression.

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