Fault location method, device and equipment of power distribution network, storage medium and program product

Abstract

The application relates to a fault positioning method, device and equipment of a power distribution network, a storage medium and a program product. The method comprises the following steps: acquiring a first confidence degree of a first type of relay protection device in the power distribution network, and acquiring a second confidence degree of a second type of relay protection device in the power distribution network; the second type of relay protection device is a relay protection device of an inverse time limit protection; each relay protection device corresponds to a line in the power distribution network; and the fault line of the power distribution network is determined according to the first confidence degrees and the second confidence degrees of all the relay protection devices. The protection actions of the relay protection devices are distinguished, different confidence degrees are set for different protection actions, the influence degree of the protection actions of the relay protection devices on the power transmission line can be quantified, the actual action conditions of all the relay protection devices are comprehensively considered for fault analysis, an external device is not needed to generate a fault signal, and the precision and accuracy of fault positioning in the power distribution network are improved.

Description

Technical Field

[0001] This application relates to the field of power system technology, and in particular to a fault location method, apparatus, equipment, storage medium and program product for power distribution networks. Background Technology

[0002] With the continuous growth of electricity demand and the increasing complexity of power systems, the stability and reliability of power supply systems face enormous challenges. Power system failures can trigger large-scale power outages, causing significant economic losses. Therefore, accurately locating faults and restoring power supply is crucial for enhancing the reliability of power supply systems. On the other hand, with the integration of distributed power sources such as rooftop photovoltaics, the network structure of low-voltage distribution areas is becoming increasingly complex, further strengthening the need for fault location.

[0003] Currently, the method for locating faults in power distribution networks involves injecting high-frequency signals or traveling waves into the transmission lines of the power distribution network. The location of the fault is obtained through the reflection of electromagnetic waves. This method is suitable for handheld devices and enables fault diagnosis.

[0004] However, the above methods suffer from the technical problem of low fault location accuracy. Summary of the Invention

[0005] Therefore, it is necessary to provide a method, device, equipment, storage medium, and program product for fault location in distribution networks that can improve the fault location accuracy of distribution networks, in response to the above-mentioned technical problems.

[0006] Firstly, this application provides a fault location method for a distribution network, including:

[0007] Obtain the first confidence level of a first category of relay protection devices in the distribution network, and obtain the second confidence level of a second category of relay protection devices in the distribution network; the second category of relay protection devices are inverse time protection relay protection devices; each relay protection device corresponds to one line in the distribution network;

[0008] The faulty lines in the distribution network are determined based on the first and second confidence levels of all relay protection devices.

[0009] In one embodiment, determining the faulty line in the distribution network based on a first confidence level and a second confidence level of all relay protection devices includes:

[0010] For each of the aforementioned relay protection devices, determine the line to which the relay protection device belongs and the upstream and downstream lines of the line;

[0011] Based on the first and second confidence levels, a third confidence level for the relay protection device is determined; the third confidence level represents the impact of the protection actions of the relay protection devices of the upstream and downstream lines on the line to which the relay protection device belongs.

[0012] The faulty lines in the distribution network are determined based on the third confidence level, first confidence level, second confidence level, and status value of all relay protection devices.

[0013] In one embodiment, determining the third confidence level of the relay protection device based on the first confidence level and the second confidence level includes:

[0014] For each of the aforementioned upstream and downstream lines, the correlation between the upstream and downstream lines and the line to which the relay protection device belongs is determined according to the topology of the distribution network;

[0015] The third confidence level of the relay protection device is determined based on the first confidence level, the second confidence level, and the correlation degree.

[0016] In one embodiment, determining the faulty line in the distribution network based on the third confidence level, first confidence level, second confidence level, and status value of all relay protection devices includes:

[0017] Determine the status value of each of the aforementioned relay protection devices; the status includes whether the relay protection is activated or not activated;

[0018] For each line in the distribution network, the first confidence level, the second confidence level, the third confidence level of the relay protection device in the line and the state value of the corresponding relay protection device are weighted and summed to obtain the relay protection characteristic value of the line.

[0019] The fault location of the distribution network is determined based on the relay protection characteristic values ​​of each line.

[0020] In one embodiment, determining the fault location of the distribution network based on the relay protection characteristic values ​​of each of the lines includes:

[0021] The line corresponding to the highest relay protection characteristic value is determined as the fault location of the distribution network.

[0022] In one embodiment, obtaining the second confidence level of the second category of relay protection devices in the distribution network includes:

[0023] After a fault is detected in the distribution network, the maximum current on all lines in the distribution network is determined;

[0024] The second confidence level of the second category of relay protection device in the distribution network is obtained by dividing the maximum current and the initial protection parameters of the second category of relay protection device.

[0025] Secondly, this application also provides a fault location device for a distribution network, comprising:

[0026] The acquisition module is used to acquire the first confidence level of a first category of relay protection devices in the distribution network, and to acquire the second confidence level of a second category of relay protection devices in the distribution network; the second category of relay protection devices are inverse time protection relay protection devices; each relay protection device corresponds to one line in the distribution network;

[0027] The determination module is used to determine the faulty line of the distribution network based on the first confidence level and the second confidence level of all relay protection devices.

[0028] Thirdly, this application also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0029] Obtain the first confidence level of a first category of relay protection devices in the distribution network, and obtain the second confidence level of a second category of relay protection devices in the distribution network; the second category of relay protection devices are inverse time protection relay protection devices; each relay protection device corresponds to one line in the distribution network;

[0030] The faulty lines in the distribution network are determined based on the first and second confidence levels of all relay protection devices.

[0031] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the following steps:

[0032] Obtain the first confidence level of a first category of relay protection devices in the distribution network, and obtain the second confidence level of a second category of relay protection devices in the distribution network; the second category of relay protection devices are inverse time protection relay protection devices; each relay protection device corresponds to one line in the distribution network;

[0033] The faulty lines in the distribution network are determined based on the first and second confidence levels of all relay protection devices.

[0034] Fifthly, this application also provides a computer program product, including a computer program that, when executed by a processor, performs the following steps:

[0035] Obtain the first confidence level of a first category of relay protection devices in the distribution network, and obtain the second confidence level of a second category of relay protection devices in the distribution network; the second category of relay protection devices are inverse time protection relay protection devices; each relay protection device corresponds to one line in the distribution network;

[0036] The faulty lines in the distribution network are determined based on the first and second confidence levels of all relay protection devices.

[0037] The aforementioned fault location method, device, equipment, storage medium, and program product for distribution networks obtain the first confidence level of a first category of relay protection devices in the distribution network, and the second confidence level of a second category of relay protection devices in the distribution network; the second category of relay protection devices are inverse time-delay protection relay protection devices; each relay protection device corresponds to one line in the distribution network; based on the first and second confidence levels of all relay protection devices, the faulty line in the distribution network is determined. By distinguishing the protection actions of the relay protection devices and setting different confidence levels for different protection actions, the impact of the protection actions of the relay protection devices on the transmission lines can be quantified. Further calculations are performed on the first and second confidence levels of all relay protection devices to obtain the relay protection characteristic values ​​of the transmission lines. Analysis of the relay protection characteristic values ​​determines the faulty line in the distribution network. This method comprehensively considers the actual operation of all relay protection devices in fault analysis, improving the accuracy and precision of fault location in the distribution network. Compared to the traditional method of injecting high-frequency signals or traveling waves into the transmission lines of the distribution network, which leads to low fault location accuracy, this application does not require external equipment to generate fault signals. Instead, it makes judgments based on the self-confidence of the relay protection devices in the distribution network, which reduces the computational load and is not affected by the performance of external equipment. At the same time, it calculates the impact on individual transmission lines based on the confidence of all relay protection devices in the distribution network, thereby improving the fault accuracy of the distribution network. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is an application environment diagram of a fault location method for a power distribution network in one embodiment;

[0040] Figure 2 This is a flowchart illustrating a fault location method for a distribution network in one embodiment;

[0041] Figure 3 This is a flowchart illustrating the process of determining a faulty line in a distribution network in one embodiment.

[0042] Figure 4 This is a flowchart illustrating the process of determining the third confidence level of a relay protection device in one embodiment;

[0043] Figure 5 This is a schematic diagram illustrating the application of a distribution network topology in one embodiment.

[0044] Figure 6 This is a flowchart illustrating the process of determining the relay protection characteristic value of a line in one embodiment.

[0045] Figure 7 This is a flowchart illustrating the process of determining the second confidence level of a relay protection device in one embodiment;

[0046] Figure 8 This is a flowchart illustrating a fault location method for a distribution network in another embodiment;

[0047] Figure 9 This is a structural block diagram of a fault location device for a power distribution network in one embodiment;

[0048] Figure 10 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0050] It should be noted that the terms "first," "second," etc., used in this application can be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from the second element. The terms "comprising" and "having," and any variations thereof, used in this application, are intended to cover non-exclusive inclusion. The term "multiple" used in this application refers to two or more. The term "and / or" used in this application refers to one of the embodiments, or any combination of multiple embodiments.

[0051] With the continuous growth of electricity demand and the increasing complexity of power systems, the stability and reliability of power supply systems face enormous challenges. Power system failures can trigger large-scale power outages, causing significant economic losses. Therefore, accurately locating faults and restoring power is crucial for enhancing the reliability of power supply systems. On the other hand, with the integration of distributed power sources such as rooftop photovoltaics, the network structure of low-voltage distribution areas is becoming increasingly complex, further strengthening the need for fault location. Currently, the method for fault location in distribution networks involves injecting high-frequency signals or traveling waves into the transmission lines of the distribution network, using electromagnetic wave reflection to determine the fault location. This method is suitable for handheld devices and enables fault diagnosis. However, the above methods suffer from the technical problem of low fault location accuracy.

[0052] In view of the above-mentioned technical problems, this application provides a fault location method for a distribution network that can improve the fault location accuracy of the distribution network. The following embodiments will specifically illustrate the fault location method for the distribution network.

[0053] The fault location method for distribution networks provided in this application embodiment can be applied to, for example... Figure 1 The application environment shown is as follows. The power distribution network includes multiple transmission lines, which are connected by switches. These switches can be switchgear, pole-mounted switches, etc., and other switching equipment is not limited here. Each switch is equipped with a relay protection device. All relay protection devices 102 of all transmission lines are connected to the processing device 104 via wired or wireless means. The relay protection device 102 includes, but is not limited to, current protection, voltage protection, distance protection, differential protection, directional protection, and zero-sequence protection, and can be selected and configured according to application requirements and fault types. The relay protection device 102 is used to issue protection action signals when a fault or abnormal situation occurs in the transmission line, so as to achieve effective protection of the transmission line. The processing device 104 can be a server, which can be an independent physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server providing cloud computing services.

[0054] In one exemplary embodiment, such as Figure 2 As shown, a fault location method for a power distribution network is provided. This embodiment illustrates the application of this method to processing equipment. In this embodiment, the method includes:

[0055] S201, obtain the first confidence level of the first category of relay protection devices in the distribution network, and obtain the second confidence level of the second category of relay protection devices in the distribution network.

[0056] Each relay protection device corresponds to one line in the distribution network. Each relay device is equipped with multiple protection functions and corresponding setpoints, including current and time settings. Protection functions include instantaneous overcurrent protection, overcurrent stage I protection, overcurrent stage II protection, overcurrent stage III protection, and inverse time protection, but other types of protection actions are also possible; there are no restrictions here. The setpoints for each protection function are different. For example, the current setting for instantaneous overcurrent protection is the largest, and the time setting is generally 0 seconds. The current setting for overcurrent stage I protection is smaller than that of instantaneous overcurrent protection, but the time setting is larger. Overcurrent stage II and III protection follow the same pattern. The current and time settings for inverse time protection are set independently and are not related to the settings for instantaneous overcurrent and overcurrent protection. The setpoints for each protection function are set according to the actual scenario requirements; there are no restrictions here.

[0057] Optionally, the first category of relay protection devices can be relay protection devices that perform non-inverse-time protection actions, which can be instantaneous overcurrent protection, overcurrent stage I protection, overcurrent stage II protection, or overcurrent stage III protection; other protection actions are also possible, and there are no restrictions here. The second category of relay protection devices are relay protection devices that perform inverse-time protection; both the first confidence level and the second confidence level refer to the degree of impact of the relay protection device's protection action on the transmission line. The self-confidence level of the relay protection device is unique, that is, the self-confidence level of the relay protection device is either the first confidence level or the second confidence level. The first confidence level of the relay protection device that performs non-inverse-time protection is fixed; for example, the first confidence level of instantaneous overcurrent protection is 1. The first confidence level of time-delay protection can be based on the ratio of the current setting of overcurrent protection to the current setting of instantaneous overcurrent protection. The second confidence level of the relay protection device that performs inverse-time protection is a floating value, which needs to be further calculated based on the current value after the transmission line fault.

[0058] In the embodiments of this application, when a transmission line in the distribution network experiences a fault, all relay protection devices determine the current value and time duration after the fault. If the current value and time duration match the set value of a configured protection function, the relay protection device executes a protection action. The processing equipment acquires in real-time the protection action information of each relay protection device in the distribution network, as well as the first confidence level of the first category of relay protection devices and the second confidence level of the second category of relay protection devices in the distribution network. It then calculates the acquired first and second confidence levels to determine the faulty line in the distribution network. When acquiring the first confidence level, an optional first method is to search for the first confidence level of non-inverse time protection in a pre-stored mapping table of protection actions and confidence levels in the local database. This involves matching the protection action type of the relay protection device with the protection action in the mapping table. If the protection action of the relay protection device is the same as the protection action in the mapping table, then the confidence level corresponding to the protection action in the mapping table is determined as the first confidence level. Alternatively, the second approach is that the relay protection device pre-stores a mapping table between protection actions and confidence levels, and when it takes a protection action, it uploads the protection action information and the corresponding confidence level to the processing device. The processing device filters the information uploaded by each relay protection device, filters the confidence levels with a certain value to obtain the first confidence level, and determines the confidence levels with an unknown value as the second confidence level.

[0059] S202, determine the faulty line in the distribution network based on the first and second confidence levels of all relay protection devices.

[0060] In the embodiments of this application, after obtaining the first and second confidence levels of all relay protection devices in the distribution network, the processing device, taking the transmission line as a separate analysis unit, first determines the confidence level of the relay protection device of the current transmission line, and then determines the upstream and downstream lines of the current transmission line in the circuit topology of the distribution network. Since each transmission line corresponds to one relay protection device, the execution of protection actions by the relay protection device will have a certain impact on the transmission line. Therefore, it is necessary to determine the confidence level of the relay protection devices of the upstream and downstream lines for the current transmission line. Finally, a comprehensive judgment is made on the confidence level of the relay protection device of the current transmission line and the confidence level of the relay protection devices of the upstream and downstream lines for the current transmission line, and the faulty line of the distribution network is determined based on the judgment result.

[0061] The aforementioned fault location method for distribution networks obtains the first confidence level of a first category of relay protection devices and the second confidence level of a second category of relay protection devices in the distribution network. The second category of relay protection devices consists of inverse-time protection devices. Each relay protection device corresponds to one line in the distribution network. Based on the first and second confidence levels of all relay protection devices, the faulty line in the distribution network is determined. By differentiating the protection actions of the relay protection devices and setting different confidence levels for different actions, the impact of the protection actions on the transmission lines can be quantified. Further calculations are performed on the first and second confidence levels of all relay protection devices to obtain the relay protection characteristic values ​​of the transmission lines. Analysis of these characteristic values ​​determines the faulty line in the distribution network. This method comprehensively considers the actual operation of all relay protection devices in fault analysis, improving the accuracy and precision of fault location in the distribution network. Compared to the traditional method of injecting high-frequency signals or traveling waves into the transmission lines of the distribution network, which leads to low fault location accuracy, this application does not require external equipment to generate fault signals. Instead, it makes judgments based on the self-confidence of the relay protection devices in the distribution network, which reduces the computational load and is not affected by the performance of external equipment. At the same time, it calculates the impact on individual transmission lines based on the confidence of all relay protection devices in the distribution network, thereby improving the fault accuracy of the distribution network.

[0062] In one exemplary embodiment, such as Figure 3 As shown, based on the first and second confidence levels of all relay protection devices, the faulty lines in the distribution network are determined, including:

[0063] S301, for each relay protection device, determine the line to which the relay protection device belongs and the upper and lower level lines of the line.

[0064] Among them, the upper and lower level lines include upper level lines and lower level lines. The number of upper level lines and lower level lines can be one or more, depending on the actual distribution network structure.

[0065] In the embodiments of this application, for each relay protection device, the transmission line connected to the input terminal of the relay protection device is determined as the line to which the relay protection device belongs. Based on the topology of the distribution network, according to the power supply direction or power flow direction of the distribution network transmission lines, the transmission line through which the current signal flows from the power source to the line to which the relay protection device belongs is determined as the upstream line, and the transmission line after the line to which the relay protection device belongs is determined as the downstream line.

[0066] S302, determine the third confidence level of the relay protection device based on the first confidence level and the second confidence level.

[0067] The third confidence level represents the impact of the protection actions of the relay protection devices of the upper and lower level lines on the lines to which the relay protection devices belong.

[0068] In the embodiments of this application, for each line to which a relay protection device belongs, the hierarchical distance between each upstream / downstream line and the line is determined according to the topology of the distribution network. The correlation degree between each upstream / downstream line and the line is calculated based on the hierarchical distance. The third confidence degree of the relay protection device is determined based on the first confidence degree, second confidence degree, and correlation degree of the relay protection device in the upstream / downstream line. Optionally, if the protection action of a relay protection device on a certain upstream or downstream line is non-inverse-time protection, the third confidence degree of the relay protection device is determined based on the first confidence degree of the relay protection device on the upstream or downstream line and the correlation degree between the upstream or downstream line and the line to which it belongs. If the protection action of a relay protection device on a certain upstream or downstream line is inverse-time protection, the third confidence degree of the relay protection device is determined based on the second confidence degree of the relay protection device on the upstream or downstream line and the correlation degree between the upstream or downstream line and the line to which it belongs.

[0069] S303 determines the faulty line in the distribution network based on the third confidence level, first confidence level, second confidence level, and status value of all relay protection devices.

[0070] In the embodiments of this application, the state value of each relay protection device is determined; for each line in the distribution network, the first confidence level, second confidence level, and third confidence level of the relay protection device in the line are weighted and summed with the state value of the corresponding relay protection device to obtain the relay protection characteristic value of the line. The fault location of the distribution network is determined based on the relay protection characteristic value of each line.

[0071] The above method obtains a third confidence level by quantifying the impact of the protection actions of the relay protection devices of the upper and lower level lines on the lines to which the relay protection devices belong. It then combines the first and second confidence levels of the relay protection devices to comprehensively determine the faulty lines in the distribution network, thereby improving the accuracy of fault location in the distribution network.

[0072] In one exemplary embodiment, such as Figure 4 As shown, based on the first and second confidence levels, the third confidence level of the relay protection device is determined, including:

[0073] S401, for each upstream and downstream line, determine the correlation between the upstream and downstream line and the line to which the relay protection device belongs, based on the topology of the distribution network.

[0074] In the embodiments of this application, the hierarchical distance between each upstream and downstream line and the line to which the relay protection device belongs is determined according to the topology of the distribution network. The determined hierarchical distance is then substituted into the following relationship (1) for calculation to obtain the correlation degree between each upstream and downstream line and the line to which the relay protection device belongs. The determination of the hierarchical distance can be based on the line to which the relay protection device belongs as the starting point, with adjacent upstream and downstream lines as the first layer, and the layer number of the lines before the adjacent upstream line and the lines after the adjacent downstream line increasing by one layer by layer to obtain the hierarchical number of all transmission lines. The hierarchical number is then used as the hierarchical distance between each upstream and downstream line and the line to which the relay protection device belongs.

[0075] Alternatively, the degree of association can be represented by the following relation (1):

[0076] (1);

[0077] Where n is the hierarchical distance between the x-th upstream or downstream line and the line to which the relay protection device belongs. The degree of correlation between the xth upstream or downstream line and the line to which the relay protection device belongs.

[0078] For example, such as Figure 5 As shown, using the line For example, its upstream lines connect to the power grid and distributed photovoltaic systems. , , , and With the line When they are directly adjacent, the hierarchical distance is 1. Substituting this into relation (1) for calculation, the correlation degree is found to be 0.5 for all of them. With the line The hierarchical distance is 2. Substituting it into relation (1) for calculation, the correlation degree is 0.25.

[0079] S402, determine the third confidence level of the relay protection device based on the first confidence level, the second confidence level, and the correlation level of the relay protection device.

[0080] In the embodiments of this application, if the protection action of the relay protection device of a certain upstream or downstream line is non-inverse time protection, the third confidence level of the relay protection device is determined based on the first confidence level of the relay protection device of the upstream or downstream line and the correlation between the upstream or downstream line and its affiliated line; if the protection action of the relay protection device of a certain upstream or downstream line is inverse time protection, the third confidence level of the relay protection device is determined based on the second confidence level of the relay protection device of the upstream or downstream line and the correlation between the upstream or downstream line and its affiliated line. Optionally, the third confidence level can be expressed by the following relationship (2):

[0081] * (2);

[0082] in, The degree of correlation between the x-th upstream or downstream line and the line to which the relay protection device belongs. C represents the first or second confidence level of the relay protection device for the x-th upstream or downstream line, and C represents the third confidence level of the relay protection device.

[0083] The above method obtains a third confidence level by quantifying the impact of the protection actions of the relay protection devices of the upper and lower level lines on the lines to which the relay protection devices belong. It then combines the first and second confidence levels of the relay protection devices to comprehensively determine the faulty lines in the distribution network, thereby improving the accuracy of fault location in the distribution network.

[0084] In one exemplary embodiment, such as Figure 6 As shown, based on the third confidence level, first confidence level, second confidence level, and status values ​​of all relay protection devices, the faulty lines in the distribution network are determined, including:

[0085] S501 determines the status values ​​of each relay protection device.

[0086] The status includes whether the relay protection is activated or not activated; the status value can be 1 or 0, or other values, depending on the actual scenario requirements, and is not restricted here.

[0087] In the embodiments of this application, after determining the first confidence level, second confidence level, and third confidence level of the relay protection device, the processing device determines the state value of the relay protection device. Optionally, when the state of the relay protection device is that the relay protection has been activated, the state value of the relay protection device is determined to be 1; when the state of the relay protection device is that the relay protection has not been activated, the state value of the relay protection device is determined to be 0.

[0088] S502: For each line in the distribution network, the first confidence level, second confidence level, and third confidence level of the relay protection device in the line are weighted and summed with the state value of the corresponding relay protection device to obtain the relay protection characteristic value of the line.

[0089] In the embodiments of this application, after obtaining the first confidence level, second confidence level, and third confidence level and state value of all relay protection devices, for each line, the first confidence level or second confidence level of the relay protection device and the first confidence level, second confidence level, and third confidence level of the relay protection devices of the upper and lower level lines are respectively weighted and summed with the state value to obtain the relay protection characteristic value of the line. Optionally, the relay protection characteristic value can be expressed by the following relationship (3):

[0090] (3);

[0091] Where r is the state value of the relay protection device, and C is the first confidence level or the second confidence level of the relay protection device; These represent the status values ​​of the relay protection devices at the i-th level, starting from the n-th line and encompassing either the upstream or downstream line. This represents the third confidence level of the relay protection device at the i-th level, starting from the n-th line. is the relay protection characteristic value of the nth line, and M is the highest level of the upstream or downstream line.

[0092] S503 determines the fault location of the distribution network based on the relay protection characteristic values ​​of each line.

[0093] In the embodiments of this application, the relay protection characteristic values ​​of all lines are compared, and the line corresponding to the highest relay protection characteristic value is determined as the fault location of the distribution network.

[0094] The above method obtains a third confidence level by quantifying the impact of the protection actions of the relay protection devices of the upper and lower level lines on the lines to which the relay protection devices belong. It then combines the first and second confidence levels of the relay protection devices to comprehensively determine the faulty lines in the distribution network, thereby improving the accuracy of fault location in the distribution network.

[0095] In an exemplary embodiment, determining the fault location of the distribution network based on the relay protection characteristic values ​​of each line includes:

[0096] The line corresponding to the highest relay protection characteristic value is identified as the fault location in the distribution network.

[0097] In the embodiments of this application, when there is only one highest relay protection characteristic value, the line corresponding to the highest relay protection characteristic value is determined as the fault location of the distribution network; when there are multiple highest relay protection characteristic values, the lines corresponding to multiple highest relay protection characteristic values ​​are determined as the fault locations of the distribution network.

[0098] The above method comprehensively quantifies the impact of a line by combining the confidence level of the relay protection devices within the line itself with the confidence level of the relay protection devices of the upstream and downstream lines, thereby improving the accuracy of fault location in the distribution network.

[0099] In one exemplary embodiment, such as Figure 7 As shown, obtaining the second confidence level of the second category of relay protection devices in the distribution network includes:

[0100] S601 determines the maximum current on all lines in the distribution network after a fault is detected.

[0101] In the embodiments of this application, after the processing device detects a fault in the power distribution network, it collects the current of all transmission lines in real time, compares the collected currents, and determines the maximum current from the currents on all lines.

[0102] S602, perform a division operation on the maximum current and the initial protection parameters of the second category of relay protection devices to obtain the second confidence level of the second category of relay protection devices in the distribution network.

[0103] The initial protection parameter is the current setting value of the inverse time protection.

[0104] In the embodiments of this application, the determined maximum current and the initial protection parameters of the second category of relay protection devices are substituted into the following relationship (4) for division calculation to obtain the second confidence level of the second category of relay protection devices in the distribution network. Optionally, the second confidence level is expressed by the following relationship (4):

[0105] (4);

[0106] in, This represents the maximum line current after a distribution network fault. The current setting for inverse time over-time protection, The second confidence level for the second category of relay protection devices.

[0107] The above method calculates the confidence level of the inverse time protection relay protection device, thereby enabling targeted processing of relay protection devices that perform different protection actions and improving the accuracy and precision of fault location in the distribution network.

[0108] In addition to the methods described in all the above embodiments, a fault location method for a distribution network is also provided, such as... Figure 8 As shown, the method includes:

[0109] S701, Obtain the first confidence level of the first category of relay protection devices in the distribution network;

[0110] S702 determines the maximum current on all lines in the distribution network after a fault is detected.

[0111] S703, divide the maximum current and the initial protection parameters of the second category of relay protection devices to obtain the second confidence level of the second category of relay protection devices in the distribution network.

[0112] S704, for each relay protection device, determine the line to which the relay protection device belongs and the upper and lower level lines of the line;

[0113] S705, for each upstream and downstream line, determines the correlation between the upstream and downstream line and the line to which the relay protection device belongs, based on the topology of the distribution network;

[0114] S706, determine the third confidence level of the relay protection device based on the first confidence level, the second confidence level, and the correlation level of the relay protection device.

[0115] S707, determine the status values ​​of each relay protection device;

[0116] S708: For each line in the distribution network, the first confidence level, second confidence level, and third confidence level of the relay protection device in the line are weighted and summed with the state value of the corresponding relay protection device to obtain the relay protection characteristic value of the line.

[0117] S709 determines the fault location of the distribution network by identifying the line corresponding to the highest relay protection characteristic value.

[0118] Each of the above steps has been described in the foregoing embodiments. For details, please refer to the foregoing content. They will not be repeated here.

[0119] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages in other steps. It is understood that the steps in different embodiments can be freely combined as needed, and all non-contradictory solutions formed by such combinations are within the scope of protection of this application.

[0120] Based on the same inventive concept, this application also provides a fault location device for a distribution network to implement the fault location method for the distribution network described above. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations of one or more fault location device embodiments for distribution networks provided below can be found in the limitations of the fault location method for distribution networks described above, and will not be repeated here.

[0121] In one exemplary embodiment, such as Figure 9 As shown, a fault location device for a power distribution network is provided, comprising: an acquisition module 91 and a determination module 92, wherein:

[0122] The acquisition module 91 is used to acquire the first confidence level of the first category of relay protection devices in the distribution network and the second confidence level of the second category of relay protection devices in the distribution network; the second category of relay protection devices are inverse time protection relay protection devices; each relay protection device corresponds to one line in the distribution network;

[0123] The determination module 92 is used to determine the faulty line in the distribution network based on the first confidence level and the second confidence level of all relay protection devices.

[0124] In an exemplary embodiment, the determining module 92 includes:

[0125] The first determining unit is used to determine the line to which the relay protection device belongs and the upper and lower level lines of the line for each relay protection device.

[0126] The second determining unit is used to determine the third confidence level of the relay protection device based on the first confidence level and the second confidence level; the third confidence level represents the impact of the protection action of the relay protection device of the upper and lower level lines on the line to which the relay protection device belongs.

[0127] The third determination unit is used to determine the faulty line in the distribution network based on the third confidence level, first confidence level, second confidence level, and status value of all relay protection devices.

[0128] In an exemplary embodiment, the second determining unit described above includes:

[0129] The first determining subunit is used to determine the correlation between the upper and lower level lines and the lines to which the relay protection device belongs, based on the topology of the distribution network, for each upper and lower level line.

[0130] The second determining subunit is used to determine the third confidence level of the relay protection device based on the first confidence level, the second confidence level, and the correlation level of the relay protection device.

[0131] In an exemplary embodiment, the third determining unit described above includes:

[0132] The third determining subunit is used to determine the status value of each relay protection device; the status includes whether the relay protection has been activated or not activated;

[0133] The calculation subunit is used to perform a weighted summation of the first confidence level, second confidence level, and third confidence level of the relay protection device in each line of the distribution network with the state value of the corresponding relay protection device to obtain the relay protection characteristic value of the line.

[0134] The fourth determination subunit is used to determine the fault location of the distribution network based on the relay protection characteristic values ​​of each line.

[0135] In an exemplary embodiment, the fourth determining subunit is specifically used to: determine the fault location of the distribution network corresponding to the line with the highest relay protection characteristic value.

[0136] In an exemplary embodiment, the acquisition module 91 includes:

[0137] The fourth determining unit is used to determine the maximum current on all lines in the distribution network after a fault is detected in the distribution network.

[0138] The calculation unit is used to perform a division operation on the maximum current and the initial protection parameters of the second category of relay protection devices to obtain the second confidence level of the second category of relay protection devices in the distribution network.

[0139] Each module in the aforementioned fault location device for the power distribution network can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device, or stored in the memory of a computer device as software, so that the processor can call and execute the corresponding operations of each module.

[0140] In one exemplary embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 10 As shown, the computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operating system and computer programs in the non-volatile storage media to run. The database stores the confidence level, status values, and setpoints of relay protection devices. The I / O interfaces are used for exchanging information between the processor and external devices. The communication interface is used for communicating with external terminals via a network connection. When the computer program is executed by the processor, it implements a fault location method for a power distribution network.

[0141] Those skilled in the art will understand that Figure 10 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0142] In one exemplary embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program that, when executed by the processor, performs the following steps:

[0143] Obtain the first confidence level of the first category of relay protection devices in the distribution network, and obtain the second confidence level of the second category of relay protection devices in the distribution network; the second category of relay protection devices are inverse time protection relay protection devices; each relay protection device corresponds to one line in the distribution network;

[0144] The faulty lines in the distribution network are determined based on the first and second confidence levels of all relay protection devices.

[0145] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0146] For each relay protection device, determine the line to which the relay protection device belongs and the upstream and downstream lines of that line;

[0147] The third confidence level of the relay protection device is determined based on the first and second confidence levels; the third confidence level represents the impact of the protection action of the relay protection device of the upstream and downstream lines on the line to which the relay protection device belongs.

[0148] The faulty lines in the distribution network are determined based on the third confidence level, first confidence level, second confidence level, and status value of all relay protection devices.

[0149] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0150] For each upstream and downstream line, the correlation between the upstream and downstream line and the line to which the relay protection device belongs is determined according to the topology of the distribution network;

[0151] The third confidence level of the relay protection device is determined based on the first confidence level, the second confidence level, and the correlation degree of the relay protection device.

[0152] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0153] Determine the status value of each relay protection device; the status includes whether the relay protection has been activated or not activated;

[0154] For each line in the distribution network, the first confidence level, second confidence level, and third confidence level of the relay protection device in the line are weighted and summed with the state value of the corresponding relay protection device to obtain the relay protection characteristic value of the line.

[0155] The location of the fault in the distribution network is determined based on the relay protection characteristic values ​​of each line.

[0156] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0157] The line corresponding to the highest relay protection characteristic value is identified as the fault location in the distribution network.

[0158] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0159] After a fault is detected in the distribution network, determine the maximum current on all lines in the distribution network;

[0160] The second confidence level of the second category of relay protection devices in the distribution network is obtained by dividing the initial protection parameters of the maximum current and the second category of relay protection devices.

[0161] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0162] Obtain the first confidence level of the first category of relay protection devices in the distribution network, and obtain the second confidence level of the second category of relay protection devices in the distribution network; the second category of relay protection devices are inverse time protection relay protection devices; each relay protection device corresponds to one line in the distribution network;

[0163] The faulty lines in the distribution network are determined based on the first and second confidence levels of all relay protection devices.

[0164] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0165] For each relay protection device, determine the line to which the relay protection device belongs and the upstream and downstream lines of that line;

[0166] The third confidence level of the relay protection device is determined based on the first and second confidence levels; the third confidence level represents the impact of the protection action of the relay protection device of the upstream and downstream lines on the line to which the relay protection device belongs.

[0167] The faulty lines in the distribution network are determined based on the third confidence level, first confidence level, second confidence level, and status value of all relay protection devices.

[0168] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0169] For each upstream and downstream line, the correlation between the upstream and downstream line and the line to which the relay protection device belongs is determined according to the topology of the distribution network;

[0170] The third confidence level of the relay protection device is determined based on the first confidence level, the second confidence level, and the correlation degree of the relay protection device.

[0171] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0172] Determine the status value of each relay protection device; the status includes whether the relay protection has been activated or not activated;

[0173] For each line in the distribution network, the first confidence level, second confidence level, and third confidence level of the relay protection device in the line are weighted and summed with the state value of the corresponding relay protection device to obtain the relay protection characteristic value of the line.

[0174] The location of the fault in the distribution network is determined based on the relay protection characteristic values ​​of each line.

[0175] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0176] The line corresponding to the highest relay protection characteristic value is identified as the fault location in the distribution network.

[0177] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0178] After a fault is detected in the distribution network, determine the maximum current on all lines in the distribution network;

[0179] The second confidence level of the second category of relay protection devices in the distribution network is obtained by dividing the initial protection parameters of the maximum current and the second category of relay protection devices.

[0180] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0181] Obtain the first confidence level of the first category of relay protection devices in the distribution network, and obtain the second confidence level of the second category of relay protection devices in the distribution network; the second category of relay protection devices are inverse time protection relay protection devices; each relay protection device corresponds to one line in the distribution network;

[0182] The faulty lines in the distribution network are determined based on the first and second confidence levels of all relay protection devices.

[0183] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0184] For each relay protection device, determine the line to which the relay protection device belongs and the upstream and downstream lines of that line;

[0185] The third confidence level of the relay protection device is determined based on the first and second confidence levels; the third confidence level represents the impact of the protection action of the relay protection device of the upstream and downstream lines on the line to which the relay protection device belongs.

[0186] The faulty lines in the distribution network are determined based on the third confidence level, first confidence level, second confidence level, and status value of all relay protection devices.

[0187] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0188] For each upstream and downstream line, the correlation between the upstream and downstream line and the line to which the relay protection device belongs is determined according to the topology of the distribution network;

[0189] The third confidence level of the relay protection device is determined based on the first confidence level, the second confidence level, and the correlation degree of the relay protection device.

[0190] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0191] Determine the status value of each relay protection device; the status includes whether the relay protection has been activated or not activated;

[0192] For each line in the distribution network, the first confidence level, second confidence level, and third confidence level of the relay protection device in the line are weighted and summed with the state value of the corresponding relay protection device to obtain the relay protection characteristic value of the line.

[0193] The location of the fault in the distribution network is determined based on the relay protection characteristic values ​​of each line.

[0194] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0195] The line corresponding to the highest relay protection characteristic value is identified as the fault location in the distribution network.

[0196] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0197] After a fault is detected in the distribution network, determine the maximum current on all lines in the distribution network;

[0198] The second confidence level of the second category of relay protection devices in the distribution network is obtained by dividing the initial protection parameters of the maximum current and the second category of relay protection devices.

[0199] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence (AI) processors, etc., and are not limited to these.

[0200] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0201] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A fault location method for a power distribution network, characterized in that, The method includes: Obtain the first confidence level of a first category of relay protection devices in the distribution network, and obtain the second confidence level of a second category of relay protection devices in the distribution network; the second category of relay protection devices are inverse time protection relay protection devices; each relay protection device corresponds to one line in the distribution network; The faulty lines in the distribution network are determined based on the first and second confidence levels of all relay protection devices.

2. The method according to claim 1, characterized in that, The step of determining the faulty line in the distribution network based on the first and second confidence levels of all relay protection devices includes: For each of the aforementioned relay protection devices, determine the line to which the relay protection device belongs and the upstream and downstream lines of the line; Based on the first and second confidence levels, a third confidence level for the relay protection device is determined; the third confidence level represents the impact of the protection actions of the relay protection devices of the upstream and downstream lines on the line to which the relay protection device belongs. The faulty lines in the distribution network are determined based on the third confidence level, first confidence level, second confidence level, and status value of all relay protection devices.

3. The method according to claim 2, characterized in that, Determining the third confidence level of the relay protection device based on the first and second confidence levels includes: For each of the aforementioned upstream and downstream lines, the correlation between the upstream and downstream lines and the line to which the relay protection device belongs is determined according to the topology of the distribution network; The third confidence level of the relay protection device is determined based on the first confidence level, the second confidence level, and the correlation degree.

4. The method according to claim 2 or 3, characterized in that, The process of determining the faulty line in the distribution network based on the third confidence level, first confidence level, second confidence level, and status value of all relay protection devices includes: Determine the status value of each of the aforementioned relay protection devices; the status includes whether the relay protection is activated or not activated; For each line in the distribution network, the first confidence level, the second confidence level, the third confidence level of the relay protection device in the line and the state value of the corresponding relay protection device are weighted and summed to obtain the relay protection characteristic value of the line. The fault location of the distribution network is determined based on the relay protection characteristic values ​​of each line.

5. The method according to claim 4, characterized in that, Determining the fault location of the distribution network based on the relay protection characteristic values ​​of each of the aforementioned lines includes: The line corresponding to the highest relay protection characteristic value is determined as the fault location of the distribution network.

6. The method according to claim 1, characterized in that, The step of obtaining the second confidence level of the second category of relay protection devices in the distribution network includes: After a fault is detected in the distribution network, the maximum current on all lines in the distribution network is determined; The second confidence level of the second category of relay protection device in the distribution network is obtained by dividing the maximum current and the initial protection parameters of the second category of relay protection device.

7. A fault location device for a power distribution network, characterized in that, The device includes: The acquisition module is used to acquire the first confidence level of a first category of relay protection devices in the distribution network, and to acquire the second confidence level of a second category of relay protection devices in the distribution network; the second category of relay protection devices are inverse time protection relay protection devices; each relay protection device corresponds to one line in the distribution network; The determination module is used to determine the faulty line of the distribution network based on the first confidence level and the second confidence level of all relay protection devices.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

Images