Multi-source data fusion power distribution network single-phase earth fault centralized studying and judging system and method

Abstract

The invention relates to a centralized studying and judging system and method for single-phase earth faults of a power distribution network based on multi-source data fusion. The method comprises the following steps: step S1, monitoring an ungrounded signal; s2, issuing a call command, locking the power distribution terminal influenced by the fault by the system, and comprehensively collecting recording data in a related time period; s3, effective recorded waves are screened out, and recorded wave files meeting conditions are screened out based on a fault occurrence time window; s4, abnormal recorded waves are removed, and recorded waves with abnormal signals, missing signals or poor waveform quality are preliminarily screened and removed; s5, grouping and collecting preprocessing: considering terminal time synchronization error and intermittent fault possibility, and grouping and collecting the recording data by the system; step S6, fault study, judgment and positioning: accurately studying and judging the position of a single-phase earth fault point in combination with recording data and line topology; step S7, performing fault alarm and display; according to the invention, powerful technical support can be provided for accurate research, judgment and positioning of the single-phase earth fault of the power distribution network.

Description

Technical Field

[0001] The present invention relates to the field of power distribution automation, and in particular to a system and method for centralized analysis of single-phase grounding faults in a power distribution network by integrating multi-source data. Background Art

[0002] Single-phase grounding faults are the most frequent fault type in distribution networks, and they require a high level of complexity in analysis and location. Their efficient and accurate identification and location have become a key challenge in improving the technical level of distribution network equipment. Based on the experience of advanced provincial grid companies, after solving problems such as on-site line selection device installation, zero-sequence CT reinstallation, and switch polarity adjustment, the accuracy of grounding line selection can be increased to 90% and the accuracy of section selection can be increased to 80% without considering high-resistance grounding, intermittent arc grounding, and multi-point grounding.

[0003] However, under the existing technical system, it is impossible to achieve accurate fault location and fault warning for complex grounding cases such as high-resistance grounding, intermittent arc grounding, and multi-point grounding. Therefore, from a long-term perspective, if the accuracy of grounding line selection, section selection, and fault warning needs to be further improved, it is necessary to introduce a centralized grounding fault master station based on transient recording, combined with more abundant electrical quantity information, to further improve the accuracy of grounding judgment. Summary of the invention

[0004] The present invention proposes a centralized analysis and judgment system for single-phase grounding faults in distribution networks with multi-source data fusion, which can be integrated into the distribution master station system. The system integrates multi-source data and is composed of modules such as recording and calling, abnormal screening, preprocessing, fault analysis and result display. By widely collecting recording data of distribution terminals affected by the fault within a specific period of time and combining it with rich electrical quantity information, the system can realize the accurate identification and positioning of single-phase grounding faults, laying a solid technical foundation for the safe operation and maintenance and fault analysis of the power system.

[0005] The present invention adopts the following technical solutions.

[0006] The method for centralized analysis and judgment of single-phase grounding fault in distribution network based on multi-source data fusion includes the following steps: Step S1: monitoring the ground loss signal, the power distribution master station instantly captures the signals inside and outside the station, and starts the fault analysis process when a ground loss fault is detected; Step S2: a call command is issued, the system locks the distribution terminal affected by the fault, and comprehensively collects the recorded data in the relevant period; Step S3: Screening valid recordings, based on the fault occurrence time window, screening out recording files that meet the conditions; Step S4: Abnormal recordings are eliminated, and recordings with abnormal signal acquisition, partial information missing, and non-grounding faults are preliminarily screened and eliminated; Step S5: Grouping and aggregation preprocessing: in view of the terminal timing error and intermittent failure phenomenon, the system groups and aggregates the recorded data; Step S6: Fault analysis and location, combining the recorded data and line topology to accurately determine the location of the single-phase grounding fault point; Step S7: Fault warning and display.

[0007] In step S2, the distribution terminals affected by the fault refer to all distribution terminals under the same bus when a single-phase grounding fault affects all lines and equipment under the same bus, that is, in this step, the recording data of all distribution terminals under the same bus are collected.

[0008] In step S3, the efficiency of subsequent analysis is improved by eliminating irrelevant data.

[0009] In step S4, the signal collection anomaly refers to that some power distribution terminals are distorted in collected signals due to aging of components due to long-term operation in outdoor environments.

[0010] In step S4, the partial information missing refers to that the internal programs of some distribution terminals are not perfect, resulting in the non-standard waveform recording files generated and the lack of some important information.

[0011] In step S4, the non-grounding fault recording refers to the non-target grounding fault recording collected by the system recording and testing module due to timing errors, unreasonable recording start conditions, and frequent recording starts at some distribution terminals. This part of the recording is a recording with low analysis value.

[0012] In step S5, the terminal timing error refers to that if the distribution terminal adopts the distribution master station timing or satellite timing, when the timing signal is not strong, there will be a deviation between the internal clock of the distribution terminal and the actual time, resulting in the collection of recorded data according to time, and the collected recorded data is not the same ground fault.

[0013] The intermittent fault means that the field equipment is in an incomplete fault state, and its system state frequently switches between fault and normal in a very short time. This instability causes the recording and calling test module to capture recording data that does not belong to the same fault event.

[0014] A centralized analysis and judgment system for single-phase grounding faults in distribution networks with multi-source data fusion is used to execute a centralized analysis and judgment method for single-phase grounding faults in distribution networks with multi-source data fusion. The system is integrated in a power distribution master station system and includes a wave recording and calling module, a wave recording abnormality screening module, a wave recording preprocessing module, a fault analysis and judgment module, and a result display module. The recording preprocessing module uses feature recognition technology to carefully classify and aggregate the collected single-phase grounding fault recordings, ensuring that the recording data belonging to the same fault source are classified together for comprehensive analysis, which is convenient for subsequent horizontal comparison and in-depth analysis; In step S6, the fault analysis module integration method and specific implementation process are as follows: Step S6-1, data collection and packaging and sending. After the distribution master station completes the collection of recorded data from the distribution terminal, it packages the recorded files, topology files and configuration files, and sends them to the preset FTP / SFTP server or the specified interaction path; Step S6-2, data reading and preparation, the standard algorithm module of the fault analysis module automatically retrieves and reads the recording file, topology file and configuration file from the FTP / SFTP server or the specified interaction path; the configuration file contains the algorithm code to be called; Step S6-3, algorithm loading and fault analysis: the standard algorithm module parses the configuration file, and loads the corresponding algorithm according to the algorithm code specified therein for fault analysis; after the analysis is completed, the analysis result is immediately transmitted to the fault result analysis module of the fault analysis module; Step S6-4, result analysis and standard output. After receiving the judgment result, the fault result analysis module combines the topology file information and forms a standard result file in accordance with the standard data format; then, the file is sent again to the FTP / SFTP server or the specified interaction path; Step S6-5: Result file acquisition and feedback: the power distribution master station actively retrieves and obtains the latest result file from the FTP / SFTP server or the specified interactive path.

[0015] In step S7, the result display module obtains the result file from the fault analysis module, displays the fault location through a topology map, and notifies the operation and maintenance personnel through channels such as text messages.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1) Multi-source data: Traditional single-phase grounding fault analysis and location technology is limited by the data collection and analysis of a single distribution terminal. The data volume is scarce and it is difficult to cope with complex scenarios such as high-resistance grounding, intermittent arc grounding and multi-point grounding, resulting in a significant bottleneck in fault identification accuracy.

[0017] 2) System integrity: This solution comprehensively constructs the comprehensive architecture of the single-phase grounding fault centralized analysis system, and elaborates on the system module composition, logical flow, architecture design, and algorithm deployment and calling mode. It provides a comprehensive and systematic reference framework for improving the upper limit of the accuracy of single-phase grounding fault analysis, and realizes the leap from local analysis to global integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: Attached Figure 1 It is a schematic diagram of the overall logic block of an embodiment of the present invention; Attached Figure 2 It is a schematic diagram of the deployment and calling logic of the fault analysis module in one embodiment of the present invention. DETAILED DESCRIPTION

[0019] As shown in the figure, the centralized analysis and judgment method of single-phase grounding fault in distribution network based on multi-source data fusion includes the following steps: Step S1: monitoring the ground loss signal, the power distribution master station instantly captures the signals inside and outside the station, and starts the fault analysis process when a ground loss fault is detected; Step S2: a call command is issued, the system locks the distribution terminal affected by the fault, and comprehensively collects the recorded data in the relevant period; Step S3: Screening valid recordings, based on the fault occurrence time window, screening out recording files that meet the conditions; Step S4: Abnormal recordings are eliminated, and recordings with abnormal signal acquisition, partial information missing, and non-grounding faults are preliminarily screened and eliminated; Step S5: Grouping and aggregation preprocessing: in view of the terminal timing error and intermittent failure phenomenon, the system groups and aggregates the recorded data; Step S6: Fault analysis and location, combining the recorded data and line topology to accurately determine the location of the single-phase grounding fault point; Step S7: Fault warning and display.

[0020] In step S2, the distribution terminals affected by the fault refer to all distribution terminals under the same bus when a single-phase grounding fault affects all lines and equipment under the same bus, that is, in this step, the recording data of all distribution terminals under the same bus are collected.

[0021] In step S3, the efficiency of subsequent analysis is improved by eliminating irrelevant data.

[0022] In step S4, the signal collection anomaly refers to that some power distribution terminals are distorted in collected signals due to aging of components due to long-term operation in outdoor environments.

[0023] In step S4, the partial information missing refers to that the internal programs of some distribution terminals are not perfect, resulting in the non-standard waveform recording files generated and the lack of some important information.

[0024] In step S4, the non-grounding fault recording refers to the non-target grounding fault recording collected by the system recording and testing module due to timing errors, unreasonable recording start conditions, and frequent recording starts at some distribution terminals. This part of the recording is a recording with low analysis value.

[0025] In step S5, the terminal timing error refers to that if the distribution terminal adopts the distribution master station timing or satellite timing, when the timing signal is not strong, there will be a deviation between the internal clock of the distribution terminal and the actual time, resulting in the collection of recorded data according to time, and the collected recorded data is not the same ground fault.

[0026] The intermittent fault means that the field equipment is in an incomplete fault state, and its system state frequently switches between fault and normal in a very short time. This instability causes the recording and calling test module to capture recording data that does not belong to the same fault event.

[0027] A centralized analysis and judgment system for single-phase grounding faults in distribution networks with multi-source data fusion is used to execute a centralized analysis and judgment method for single-phase grounding faults in distribution networks with multi-source data fusion. The system is integrated in a power distribution master station system and includes a wave recording and calling module, a wave recording abnormality screening module, a wave recording preprocessing module, a fault analysis and judgment module, and a result display module. The recording preprocessing module uses feature recognition technology to carefully classify and aggregate the collected single-phase grounding fault recordings, ensuring that the recording data belonging to the same fault source are classified together for comprehensive analysis, which is convenient for subsequent horizontal comparison and in-depth analysis; In step S6, the fault analysis module integration method and specific implementation process are as follows: Step S6-1, data collection and packaging and sending. After the distribution master station completes the collection of recorded data from the distribution terminal, it packages the recorded files, topology files and configuration files, and sends them to the preset FTP / SFTP server or the specified interaction path; Step S6-2, data reading and preparation, the standard algorithm module of the fault analysis module automatically retrieves and reads the recording file, topology file and configuration file from the FTP / SFTP server or the specified interaction path; the configuration file contains the algorithm code to be called; Step S6-3, algorithm loading and fault analysis: the standard algorithm module parses the configuration file, and loads the corresponding algorithm for fault analysis according to the algorithm code specified therein; after the analysis is completed, the analysis result is immediately transmitted to the fault result analysis module of the fault analysis module; Step S6-4, result analysis and standard output: after receiving the judgment result, the fault result analysis module combines the topology file information and forms a standard result file in accordance with the standard data format; then, the file is sent again to the FTP / SFTP server or the specified interaction path; Step S6-5: Result file acquisition and feedback: the power distribution master station actively retrieves and obtains the latest result file from the FTP / SFTP server or the specified interactive path.

[0028] In step S7, the result display module obtains the result file from the fault analysis module, displays the fault location through a topology map, and notifies the operation and maintenance personnel through channels such as text messages.

Claims

1. A centralized analysis and judgment method for single-phase grounding fault in distribution network based on multi-source data fusion, characterized by: The steps include: Step S1: monitoring the ground loss signal, the power distribution master station instantly captures the signals inside and outside the station, and starts the fault analysis process when a ground loss fault is detected; Step S2: a call command is issued, the system locks the distribution terminal affected by the fault, and comprehensively collects the recorded data in the relevant period; Step S3: Screening valid recordings, based on the fault occurrence time window, screening out recording files that meet the conditions; Step S4: Abnormal recordings are eliminated, and recordings with abnormal signal acquisition, partial information missing, and non-grounding faults are preliminarily screened and eliminated; Step S5: Grouping and aggregation preprocessing: in view of the terminal timing error and intermittent failure phenomenon, the system groups and aggregates the recorded data; Step S6: Fault analysis and location, combining the recorded data and line topology to accurately determine the location of the single-phase grounding fault point; Step S7: Fault warning and display.

2. The method for centralized analysis and judgment of single-phase grounding fault in distribution network based on multi-source data fusion according to claim 1 is characterized by: In step S2, the distribution terminals affected by the fault refer to all distribution terminals under the same bus when a single-phase grounding fault affects all lines and equipment under the same bus, that is, in this step, the recording data of all distribution terminals under the same bus are collected.

3. The method for centralized analysis and judgment of single-phase grounding fault in distribution network based on multi-source data fusion according to claim 1 is characterized by: In step S3, the efficiency of subsequent analysis is improved by eliminating irrelevant data.

4. The method for centralized analysis and judgment of single-phase grounding fault in distribution network based on multi-source data fusion according to claim 1 is characterized by: In step S4, the signal collection anomaly refers to that some power distribution terminals are distorted in collected signals due to aging of components due to long-term operation in outdoor environments.

5. The method for centralized analysis and judgment of single-phase grounding fault in distribution network based on multi-source data fusion according to claim 1 is characterized by: In step S4, the partial information missing refers to that the internal programs of some distribution terminals are not perfect, resulting in the non-standard waveform recording files generated and the lack of some important information.

6. The method for centralized analysis and judgment of single-phase grounding fault in distribution network based on multi-source data fusion according to claim 1 is characterized by: In step S4, the non-grounding fault recording refers to the non-target grounding fault recording collected by the system recording and testing module due to timing errors, unreasonable recording start conditions, and frequent recording starts at some distribution terminals. This part of the recording is a recording with low analysis value.

7. The method for centralized analysis and judgment of single-phase grounding fault in distribution network based on multi-source data fusion according to claim 1 is characterized by: In step S5, the terminal timing error refers to that if the distribution terminal adopts the distribution master station timing or satellite timing, when the timing signal is not strong, there will be a deviation between the internal clock of the distribution terminal and the actual time, resulting in the collection of recorded data according to time, and the collected recorded data is not the same ground fault.

8. The method for centralized analysis and judgment of single-phase grounding fault in distribution network based on multi-source data fusion according to claim 1 is characterized by: The intermittent fault means that the field equipment is in an incomplete fault state, and its system state frequently switches between fault and normal in a very short time. This instability causes the recording and calling test module to capture recording data that does not belong to the same fault event.

9. A centralized analysis and judgment system for single-phase grounding fault in distribution network based on multi-source data fusion, which is used to execute a centralized analysis and judgment method for single-phase grounding fault in distribution network based on multi-source data fusion, and is characterized by: The system is integrated in the power distribution master station system, and includes a wave recording call test module, a wave recording abnormality screening module, a wave recording preprocessing module, a fault analysis module and a result display module; The recording preprocessing module uses feature recognition technology to carefully classify and aggregate the collected single-phase grounding fault recordings, ensuring that the recording data belonging to the same fault source are classified together for comprehensive analysis, which is convenient for subsequent horizontal comparison and in-depth analysis; In step S6, the fault analysis module integration method and specific implementation process are as follows: Step S6-1, data collection and packaging and sending. After the distribution master station completes the collection of recorded data from the distribution terminal, it packages the recorded files, topology files and configuration files, and sends them to the preset FTP / SFTP server or the specified interaction path; Step S6-2, data reading and preparation, the standard algorithm module of the fault analysis module automatically retrieves and reads the recording file, topology file and configuration file from the FTP / SFTP server or the specified interaction path; the configuration file contains the algorithm code to be called; Step S6-3, algorithm loading and fault analysis: the standard algorithm module parses the configuration file, and loads the corresponding algorithm for fault analysis according to the algorithm code specified therein; after the analysis is completed, the analysis result is immediately transmitted to the fault result analysis module of the fault analysis module; Step S6-4, result analysis and standard output: after receiving the judgment result, the fault result analysis module combines the topology file information and forms a standard result file in accordance with the standard data format; then, the file is sent again to the FTP / SFTP server or the specified interaction path; Step S6-5: Result file acquisition and feedback: the power distribution master station actively retrieves and obtains the latest result file from the FTP / SFTP server or the specified interactive path.

10. The distribution network single-phase grounding fault centralized analysis and judgment system based on multi-source data fusion according to claim 9 is characterized by: In step S7, the result display module obtains the result file from the fault analysis module, displays the fault location through a topology map, and notifies the operation and maintenance personnel through channels such as text messages.

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