Fault processing method based on optimization analysis

Abstract

The invention discloses a fault processing method based on optimization analysis. The method comprises the following steps: carrying out analysis control management on the characteristic frequency of an urban distribution network; performing current analysis and fault component processing on the urban distribution network; performing fault line selection analysis optimization control management of the urban distribution network; and carrying out early warning transmission on the fault data information of the urban distribution network. The analysis, control and management of the characteristic frequency of the urban distribution network comprises the following steps: selecting a frequency point parameter with the maximum zero-sequence current amplitude of each line of the urban distribution network in the SFB frequency band, and taking the frequency point parameter as the fault characteristic frequency of the corresponding line in the SFB frequency band. The current analysis and fault component processing of the urban distribution network comprises the following steps: collecting and detecting zero-sequence current data information of each line of the distribution network, and marking, analyzing and processing the zero-sequence current data information; and after the marking result data information of the urban distribution network line is received, the transient zero-sequence current component of the line is further analyzed and processed. The method has the characteristics of intelligent optimization processing and high efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of fault processing, and in particular to a fault processing method based on optimization analysis. Background Art

[0002] Electricity is an indispensable and important energy source today. The construction of the power system is the foundation of national economic development and is related to the quality of life of the people. However, once a power system fails, it will not only affect people's daily lives, but also bring impacts to the national economic construction. The development speed of urban distribution networks in my country is relatively fast, and the distribution network structure is relatively complex. It has the characteristics of multiple voltage levels, weak network architecture, and high failure rate. Therefore, it is vulnerable to fault shocks. According to power grid statistics, short-circuit faults have the greatest impact on the reliability of distribution network power supply, among which single-phase grounding faults account for nearly 80% of the total number of short-circuit faults. Therefore, it is particularly important to study the fault line selection technology for single-phase grounding faults. And because the urban distribution network structure is relatively complex and the lines are long, it takes a lot of time and material resources to search and maintain the fault location, which seriously affects the work efficiency of power operation and inspection personnel. Therefore, it is necessary to design an intelligent optimization processing and efficient fault handling method based on optimization analysis. Summary of the invention

[0003] The purpose of the present invention is to provide a fault handling method based on optimization analysis to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a fault handling method based on optimization analysis, comprising: Analyze, control and manage the characteristic frequency of urban distribution networks; Conduct current analysis and fault component processing of urban distribution networks; Conduct fault line selection analysis, optimization, control and management of urban distribution networks; Early warning transmission of fault data information of urban distribution networks.

[0005] According to the above technical solution, the analysis, control and management of the characteristic frequency of the urban distribution network includes: After selecting the frequency point parameters of the maximum zero-sequence current amplitude of each line in the urban distribution network within the SFB frequency band, it is used as the fault characteristic frequency of the corresponding line within the SFB frequency band.

[0006] According to the above technical solution, the current analysis and fault component processing of the urban distribution network includes: Collect and detect zero-sequence current data information of each line in the distribution network, and perform labeling, analysis and processing; After receiving the marking result data information of the urban distribution network line, the transient zero-sequence current component of the line is further analyzed and processed.

[0007] According to the above technical solution, the fault line selection analysis optimization control management of the urban distribution network includes: According to the processing results of the line marking and transient zero-sequence current component of the urban distribution network, after completing the detection of the busbar zero-sequence voltage value, the line fault determination processing of the urban distribution network is carried out; After completing the line fault determination processing of the urban distribution network, further perform fault line selection analysis and processing based on the zero-sequence current sampling values ​​of each feeder line; After receiving the analysis and processing result information of the fault line selection, the result information is backed up and stored through the blockchain node.

[0008] According to the above technical solution, the early warning transmission of fault data information of the urban distribution network includes: While backing up the fault line selection analysis result information, an early warning notification is immediately sent to the maintenance personnel so that they can carry out the corresponding emergency repairs; After the fault line selection and processing information is organized in the form of a table, it is transmitted to the maintenance personnel's mobile phone for their reference, so that they can quickly carry out fault repair processing.

[0009] According to the above technical solution, a fault handling system based on optimization analysis includes: Management and control module, used for current analysis, management and control of urban distribution networks; Fault handling module, used for fault line selection analysis, optimization, control and management of urban distribution networks; The early warning transmission module is used to transmit early warning information of fault data of urban distribution networks.

[0010] According to the above technical solution, the management control module includes: Characteristic frequency module, used for characteristic frequency analysis and processing of urban distribution network; Current management module, used for current control and management of urban distribution network; The component processing module is used to analyze and process the transient zero-sequence current component of the line.

[0011] According to the above technical solution, the fault processing module includes: Line selection and determination module, used to determine and process line faults in urban distribution networks; Analysis and processing module, used for fault line selection analysis and processing; The backup storage module is used for data information backup analysis and management.

[0012] According to the above technical solution, the early warning transmission module includes: Transmission and display module, used for transmission and display processing of data information; The early warning notification module is used to provide early warning notifications of distribution network failures.

[0013] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention, by providing a management control module, a fault processing module and an early warning transmission module, makes the impedance characteristics of each frequency point of the main component of the spectrum present capacitive characteristics, can effectively reflect the overall fault information of the line of the urban distribution network, and makes the impedance of each line present capacitive characteristics, and makes the maximum use of the fault information in the SFB, effectively improves the efficiency of distribution network fault analysis and processing, and analyzes the proportion of transient zero-sequence current components of the line, so that the distribution network fault analysis and processing is more efficient and accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 is a flow chart of a fault handling method based on optimization analysis provided in Embodiment 1 of the present invention; Figure 2 This is a module structure diagram of a fault handling system based on optimization analysis provided in Embodiment 2 of the present invention. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] Embodiment 1: Figure 1 This is a flowchart of a fault handling method based on optimization analysis provided in Embodiment 1 of the present invention. This embodiment can be applied to a system. The method can be executed by a fault handling system based on optimization analysis provided in Embodiment 1 of the present invention. The system is composed of multiple software and hardware modules, such as Figure 1 As shown, the method specifically comprises the following steps: S101. Analyze, control and manage the characteristic frequency of the urban distribution network; Exemplarily, in an embodiment of the present invention, after selecting the frequency point parameter of the maximum zero-sequence current amplitude of each line in the urban distribution network within the SFB frequency band, it is used as the fault characteristic frequency of the corresponding line in the SFB frequency band; because the fault information of the distribution network is composed of the overlapping of multi-frequency fault signals, the zero-sequence current in this frequency band is also the superposition of multiple frequency currents, and in the SFB frequency band, the fault signal is composed of a large number of integer multiple power frequency signals, and the voltage and current information of the signal are constrained by the corresponding line parameters, reflecting the fault characteristics of the line. Therefore, through this step, the frequency point parameter of the maximum zero-sequence current amplitude of each line in the SFB frequency band is selected as the fault characteristic frequency of the corresponding line in the SFB frequency band, so that the impedance characteristics of each frequency spectrum main component frequency point all show capacitive characteristics, which can effectively reflect the overall fault information of the line of the urban distribution network, and make the impedance of each line show capacitive characteristics, and maximize the use of fault information in the SFB, effectively improving the efficiency of distribution network fault analysis and processing.

[0017] S102, performing current analysis and fault component processing of the urban distribution network; Exemplarily, in an embodiment of the present invention, the zero-sequence current data information of each line in the distribution network is collected and detected, and marked and analyzed; for any healthy line in the distribution network, since it is not affected by the arc suppression coil, the healthy distribution network line presents capacitive characteristics in the minimum series resonance frequency band, and the zero-sequence current direction on the healthy line at any frequency in this frequency band is consistent with the reference direction, and is nearly 90° ahead of its zero-sequence voltage, while the equivalent impedance of the fault line is capacitive, and its characteristic frequency zero-sequence current fault characteristics are similar to the zero-sequence current fault characteristics of the same frequency point in an ungrounded system, and the zero-sequence current of the fault line is numerically equal to the sum of the zero-sequence current values ​​of all healthy lines, and the two directions are opposite, so through this step, the zero-sequence current data information of each line in the distribution network is collected and detected, and the line whose current data information conforms to the fault line is marked and processed, waiting for subsequent processing.

[0018] After receiving the marking result data information of the urban distribution network line, the transient zero-sequence current component of the line is further analyzed and processed; in this step, the transient zero-sequence current is mainly composed of three parts, namely the power frequency component, the attenuated transient main frequency component (high-frequency attenuation signal) and the attenuated DC component. Since the main frequency component is the component signal with the most obvious high-frequency component characteristics in the transient zero-sequence current, it concentrates the fault information of the transient component and can reflect the basic characteristics of the fault information. When a single-phase grounding fault occurs in the distribution network line, due to the compensation effect of the arc suppression coil, the inductive power frequency component it generates compensates for the capacitive power frequency component in the fault line, which greatly reduces the power frequency component of the zero-sequence current of the fault line. Therefore, through this step, the proportion of the transient zero-sequence current component of the line is analyzed, making the subsequent fault analysis and processing more efficient and accurate.

[0019] S103, perform fault line selection analysis, optimization, control and management of urban distribution networks; Exemplarily, in an embodiment of the present invention, after completing the detection of the bus zero-sequence voltage value according to the line mark of the urban distribution network and the processing results of the transient zero-sequence current component, the line fault determination processing of the urban distribution network is performed; in this step, when it is obtained that the instantaneous value of the bus zero-sequence voltage collected by the monitoring is greater than the set threshold, the zero-sequence current of each outgoing line and the bus zero-sequence voltage value in one power frequency cycle after the fault are recorded, and the maximum value of the current amplitude information and the DC component amplitude information of the line at each frequency point in the SFB frequency band under the fixed window are obtained through S transformation, and the relationship between the two is compared. If there is a line DC component with an amplitude greater than the amplitude of any frequency point in the SFB frequency band, it can be determined that the fault occurred at a low fault closing angle. If any line DC component is less than the current amplitude at the maximum frequency point in the SFB frequency band, it is determined that the fault occurred at a high fault closing angle.

[0020] After completing the line fault determination processing of the urban distribution network, further perform fault line selection analysis and processing based on the zero-sequence current sampling value of each feeder line; in this step, after obtaining the line fault determination processing of the urban distribution network, start the fault line selection process based on the zero-sequence current sampling value of each feeder line after the fault occurs, specifically: calculate the transient zero-sequence current of each feeder line through the Prony algorithm, extract the amplitude, phase, frequency, and attenuation factor of the DC component and main frequency component of the zero-sequence current, and after calculating and analyzing the proportion of the DC current component of each feeder line, determine whether it is greater than 1. If it is greater than 1, the corresponding feeder line is determined to be a faulty line, otherwise the amplitude ratio and phase difference of the main frequency component are calculated, and the amplitude-phase measurement is further calculated. When the amplitude-phase measurement is greater than the line amplitude ratio, the feeder line is determined to be a faulty line, otherwise the fault is determined to occur outside the feeder line.

[0021] After receiving the analysis and processing result information of the fault line selection, the result information is backed up and stored through the blockchain node, effectively preventing the information from being tampered with and ensuring the security of the information.

[0022] S104, early warning transmission of fault data information of the urban distribution network; Exemplarily, in an embodiment of the present invention, while backing up the fault line selection analysis result information, an early warning notification is immediately sent to maintenance personnel to enable them to perform corresponding emergency repairs; After the fault line selection and processing information is organized in the form of a table, it is transmitted to the maintenance personnel's mobile phone for their reference, so that they can quickly carry out fault repair processing.

[0023] Embodiment 2: Embodiment 2 of the present invention provides a fault handling system based on optimization analysis. Figure 2 A schematic diagram of the module structure of a fault handling system based on optimization analysis provided in the second embodiment, such as Figure 2 As shown, the system includes: Management and control module, used for current analysis, management and control of urban distribution networks; Fault handling module, used for fault line selection analysis, optimization, control and management of urban distribution networks; The early warning transmission module is used to transmit early warning information of fault data of urban distribution networks.

[0024] In some embodiments of the present invention, the management control module includes: Characteristic frequency module, used for characteristic frequency analysis and processing of urban distribution network; Current management module, used for current control and management of urban distribution network; The component processing module is used to analyze and process the transient zero-sequence current component of the line.

[0025] In some embodiments of the present invention, the fault processing module includes: Line selection and determination module, used to determine and process line faults in urban distribution networks; Analysis and processing module, used for fault line selection analysis and processing; The backup storage module is used for data information backup analysis and management.

[0026] In some embodiments of the present invention, the early warning transmission module includes: Transmission and display module, used for transmission and display processing of data information; The early warning notification module is used to provide early warning notifications of distribution network failures.

[0027] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0028] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fault handling method based on optimization analysis, characterized in that: include: Analyze, control and manage the characteristic frequency of urban distribution networks; Conduct current analysis and fault component processing of urban distribution networks; Conduct fault line selection analysis, optimization, control and management of urban distribution networks; Early warning transmission of fault data information of urban distribution networks.

2. The method for troubleshooting based on optimization analysis according to claim 1, characterized in that: The analysis, control and management of the characteristic frequency of the urban distribution network includes: After selecting the frequency point parameters of the maximum zero-sequence current amplitude of each line in the urban distribution network within the SFB frequency band, it is used as the fault characteristic frequency of the corresponding line within the SFB frequency band.

3. The fault handling method based on optimization analysis according to claim 1, characterized in that: The current analysis and fault component processing of the urban distribution network includes: Collect and detect zero-sequence current data information of each line in the distribution network, and perform labeling, analysis and processing; After receiving the marking result data information of the urban distribution network line, the transient zero-sequence current component of the line is further analyzed and processed.

4. The method for troubleshooting based on optimization analysis according to claim 1, characterized in that: The fault line selection analysis optimization control management of the urban distribution network includes: According to the processing results of the line marking and transient zero-sequence current component of the urban distribution network, after completing the detection of the busbar zero-sequence voltage value, the line fault determination processing of the urban distribution network is carried out; After completing the line fault determination processing of the urban distribution network, further perform fault line selection analysis and processing based on the zero-sequence current sampling values ​​of each feeder line; After receiving the analysis and processing result information of the fault line selection, the result information is backed up and stored through the blockchain node.

5. The fault handling method based on optimization analysis according to claim 1 is characterized in that: The early warning transmission of fault data information of the urban distribution network includes: While backing up the fault line selection analysis result information, an early warning notification is immediately sent to the maintenance personnel so that they can carry out the corresponding emergency repairs; After the fault line selection and processing information is organized in the form of a table, it is transmitted to the maintenance personnel's mobile phone for their reference, so that they can quickly carry out fault repair processing.

6. A fault handling system based on optimization analysis, characterized in that: include: Management and control module, used for current analysis, management and control of urban distribution networks; Fault handling module, used for fault line selection analysis, optimization, control and management of urban distribution networks; The early warning transmission module is used to transmit early warning information of fault data of urban distribution networks.

7. The fault handling system based on optimization analysis according to claim 6 is characterized in that: The management control module includes: Characteristic frequency module, used for characteristic frequency analysis and processing of urban distribution network; Current management module, used for current control and management of urban distribution network; The component processing module is used to analyze and process the transient zero-sequence current component of the line.

8. The fault handling system based on optimization analysis according to claim 6, characterized in that: The fault processing module comprises: Line selection and determination module, used to determine and process line faults in urban distribution networks; Analysis and processing module, used for fault line selection analysis and processing; The backup storage module is used for data information backup analysis and management.

9. The fault handling system based on optimization analysis according to claim 6, characterized in that: The early warning transmission module includes: Transmission and display module, used for transmission and display processing of data information; The early warning notification module is used to provide early warning notifications of distribution network failures.

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