Method and device for measuring fault location of contact network in DC traction power supply system of subway

Abstract

The application provides a metro DC traction power supply system catenary fault ranging method and device, comprising: obtaining fault recording data generated when the double-sided protection device acts, wherein the fault recording data comprises feeder voltage and feeder current; based on the feeder current at any point in time, the feeder current at the next time is obtained through a prediction algorithm, in response to the prediction result meeting the preset condition and the feeder having voltage, the fault starting point of the double-sided protection device is determined; data processing is performed on the two fault starting points to obtain ranging data points; the feeder voltage and the feeder current of the ranging data points are subjected to fault ranging through a fault ranging algorithm to determine the fault point position of the catenary. The metro DC traction power supply system catenary fault ranging method and device provided by the application can realize fault ranging by analyzing the recording file, and improve the reliability and performance of the metro system.

Description

Technical Field

[0001] The present application belongs to the field of urban rail transit traction power supply technology, and in particular relates to a method and device for measuring contact network faults in a subway DC traction power supply system. Background Art

[0002] The subway is a vital form of urban public transportation, carrying a large number of passengers, making safety a top priority. The catenary is one of the primary traction power supply systems for rail transit, responsible for providing power to trains. It is the only component without a backup and is crucial for ensuring power supply security and stable operation for trains. However, because the catenary utilizes pantographs (collector shoes) to draw power through sliding motions, failures are highly probable and virtually unavoidable. Further complicating matters, these failures often occur within tunnels, making accurate location difficult. Once a failure occurs, it can severely impact the normal operation of trains. Therefore, maintaining and promptly repairing catenary faults is crucial for the safety and operation of rail transit.

[0003] Fault location measurement in subway rail transit is crucial for safety, operational efficiency, and cost control. However, most subway sites currently lack fault location measurement capabilities, only having fault recording. The advantage of using recording for distance measurement is that it does not require any changes to the subway system's hardware and can utilize existing recording equipment and systems for distance measurement, reducing costs and risks. Summary of the Invention

[0004] In view of this, the present application aims to propose a method and device for measuring fault distance of the contact network of a subway DC traction power supply system, so as to solve the problem that the fault point is difficult to locate accurately, and once a fault occurs, it will seriously affect the normal operation of the train.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows:

[0006] In a first aspect, the present application provides a method for measuring fault location in a direct current (DC) traction power supply system for a subway. The DC traction power supply system for the subway is provided with bilateral power supply by two traction substations. In response to a short circuit fault in the DC traction power supply system, bilateral protection devices are triggered to operate simultaneously. The method comprises:

[0007] Acquiring fault recording data generated when the bilateral protection device is actuated, wherein the fault recording data includes feeder voltage and feeder current;

[0008] Based on the feeder current at any point in time, a prediction algorithm is used to predict the feeder current at the next moment, and in response to the prediction result satisfying a preset condition and the feeder having voltage, a fault starting point of the bilateral protection device is determined, wherein the prediction algorithm uses a recursive least squares method to perform linear fitting on the feeder current;

[0009] Performing data processing on the two fault starting points to obtain ranging data points;

[0010] Fault distance measurement is performed on the feeder voltage and feeder current of the distance measurement data point by using a fault distance measurement algorithm to determine the fault point position of the contact network.

[0011] In a second aspect, based on the same inventive concept, the present application also provides a subway DC traction power supply system overhead line fault distance measuring device, comprising:

[0012] a data acquisition module configured to acquire fault recording data generated when the bilateral protection device is actuated, wherein the fault recording data includes feeder voltage and feeder current;

[0013] a prediction module configured to predict the feeder current at the next moment based on the feeder current at any point in time using a prediction algorithm, and determine a fault starting point of the bilateral protection device in response to the prediction result satisfying a preset condition and the feeder having voltage, wherein the prediction algorithm uses a recursive least squares method to perform linear fitting on the feeder current;

[0014] a data processing module configured to process data of the two fault starting points to obtain ranging data points;

[0015] The ranging module is configured to perform fault ranging on the feeder voltage and feeder current of the ranging data point by using a fault ranging algorithm to determine the fault point position of the contact network.

[0016] In the third aspect, based on the same inventive concept, the present application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and runnable on the processor. When the processor executes the program, it implements the contact network fault ranging method of the subway DC traction power supply system as described in the first aspect.

[0017] In the fourth aspect, based on the same inventive concept, the present application also provides a non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the subway DC traction power supply system contact network fault ranging method as described in the first aspect.

[0018] Compared with the prior art, the method and device for measuring fault location in the overhead line of a subway DC traction power supply system described in this application have the following beneficial effects:

[0019] The method and device for measuring fault distance of the contact network of the subway DC traction power supply system described in this application extract fault data based on the recorded waveforms obtained from the substations on both sides, determine the fault starting point of the bilateral protection device through linear fitting calculation, and calculate the fault point location using a fault ranging algorithm. The method can detect and locate the fault location in a timely and accurate manner, effectively reducing the risk of accidents and improving passenger safety; and helps to quickly locate the fault point, reduce the time to resume operations, improve operational efficiency, and timely repair the fault location can also reduce maintenance and repair costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0021] Figure 1 This is an electrical wiring diagram of a DC traction power supply system for urban rail transit using a bilateral power supply method as described in an embodiment of the present application;

[0022] Figure 2 This is a flow chart of the method for measuring fault location of the overhead line of a subway DC traction power supply system according to an embodiment of the present application;

[0023] Figure 3 This is the proximal short circuit fault diagram described in the embodiment of the present application;

[0024] Figure 4 This is the remote short circuit fault diagram described in the embodiment of the present application;

[0025] Figure 5 This is a schematic structural diagram of a contact network fault distance measuring device for a subway DC traction power supply system according to an embodiment of the present application;

[0026] Figure 6 This is a schematic diagram of the hardware structure of the electronic device described in an embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of this application more clear, this application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0028] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in the embodiments of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0030] like Figure 1 As shown, Figure 1 The electrical wiring diagram of the urban rail transit DC traction power supply system using a dual-side power supply configuration is shown. In this configuration, the two generator sets operate in parallel, helping to reduce the impact of high-order harmonics on the AC power supply system. Each power supply section is powered by two adjacent substations, which reduces stray currents and power losses, thereby improving voltage drop during train startup and operation.

[0031] See also Figure 2 As shown, this embodiment provides a method for measuring fault location in a DC traction power supply system of a subway. The DC traction power supply system of the subway is provided with bilateral power supply by two traction substations. In response to a short-circuit fault in the overhead line, the protection devices on both sides are triggered to operate simultaneously, and recording files of the protection devices on both sides are obtained. The method includes the following steps:

[0032] Step S101: Acquire fault recording data generated when the bilateral protection device is actuated, wherein the fault recording data includes feeder voltage and feeder current.

[0033] Specifically, when a short circuit occurs in the subway power supply system, the system's protective devices will rapidly activate according to pre-set protection logic. These devices, which can include circuit breakers, relays, and current sensors, will monitor current and voltage waveforms to trigger actions when the fault occurs. Simultaneously, a waveform recorder will begin recording current and voltage waveform data, including waveforms before, during, and after the fault, to ensure a comprehensive record of the fault. The recorded waveform file is then uploaded to the backend server via communication protocols.

[0034] Step S102: Based on the feeder current at any point in time, the feeder current at the next moment is predicted by a prediction algorithm. In response to the prediction result meeting the preset conditions and the feeder having voltage, the fault starting point of the bilateral protection device is determined. The prediction algorithm uses a recursive least squares method to perform linear fitting on the feeder current.

[0035] In some embodiments, the feeder current at any point in time is obtained, a linear fit is performed on the feeder current by fitting an objective function, and the fitting parameters are updated and iterated to predict the feeder current at the next moment;

[0036] Compare the feeder current at the next moment with the actually sampled feeder current. If the comparison result satisfies a preset threshold range and there is voltage on the feeder, the point is determined to be the fault starting point.

[0037] In response to the absence of voltage on the feeder, the point is determined to be a normal point, and the fitting parameters are continuously updated and iterated until the fault starting point is obtained.

[0038] Specifically, in this embodiment, the present application uses the recursive least squares method to perform linear fitting on the feeder current data of the fault recording, and then uses the fitting result to infer the feeder current size at the next moment, and compares it with the actual sampled feeder current size. If the prediction results at this point are significantly different from the expected ones and there is voltage on the feeder, then the moment of this point is considered to be the starting moment of the fault.

[0039] The fitting objective function formula described in this embodiment is:

[0040] y=mx+n;

[0041] Among them, y is the feeder current, x is the time, m and n are the parameters to be fitted.

[0042] In addition to the above embodiments, the present application can also analyze the fault starting point from the waveform, as follows:

[0043] The voltage drop rate and current rise rate are used as the two criteria for judgment. The drop rate at any point is calculated by taking the average of the 10 points before the point as the analog value at the previous moment, and taking the average of the 10 points after the point as the analog value at the moment after the point. The difference between the two analog values ​​divided by the time difference is the rate of change at the point. If the feeder current rise rate exceeds the set value and the feeder is under pressure, it is determined to be the fault starting point.

[0044] This process is performed on both recording files to obtain two fault starting points.

[0045] Step S103: Process the data of the two fault starting points to obtain ranging data points.

[0046] In some implementations, the protection action time point is taken as the 0 point on the time axis and the protection action time point is taken as the reference point. The time difference between the two fault starting points and the reference point is calculated respectively, and the fault starting point with the smaller time difference is selected as the ranging data point.

[0047] Specifically, the recording file takes the protection action time point as point 0, calculates the differences t1 and t2 between the fault starting point and point 0 of the two recording files, and takes the shorter value as the time point provided by the ranging data.

[0048] Step S104: perform fault distance measurement on the feeder voltage and feeder current of the distance measurement data point using a fault distance measurement algorithm to determine the location of the fault point of the contact network.

[0049] Specifically, the fault location algorithm is as follows:

[0050]

[0051]

[0052] Where L is the distance between traction substations M and N, L m is the distance between the fault point and the traction substation M, L n is the distance between the fault point and the traction substation N, Um and Im are the feeder voltage and feeder current when the DC feeder protection at the M end is actuated, and Un and In are the feeder voltage and feeder current when the DC feeder protection at the N end is actuated.

[0053] The method for measuring fault distance in the contact network of a subway DC traction power supply system described in this embodiment extracts fault data based on the waveform records obtained from the substations on both sides, determines the fault starting point of the bilateral protection device through linear fitting calculation, and calculates the fault point location using a fault ranging algorithm. The method can detect and locate the fault location in a timely and accurate manner, effectively reducing accident risks and improving passenger safety. It also helps to quickly locate the fault point, reduce the time to resume operations, improve operational efficiency, and timely repair the fault location can also reduce maintenance and repair costs.

[0054] In some cases, the actions or steps recited in the claims can be performed in an order different from that in the above-described embodiments and still achieve the desired results. Additionally, the processes depicted in the accompanying drawings do not necessarily require the particular order shown or sequential order to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0055] When this plan is implemented:

[0056] This embodiment takes the recording of the short-circuit test of Hefei Line 3 as an example. Figure 3 is the near-end short-circuit fault diagram, Figure 4 For remote short-circuit fault graph, the horizontal axis unit is millisecond, the vertical axis Uf is the feeder voltage, unit is volt; If is the feeder current, unit is ampere.

[0057] When the overhead contact line short-circuit fault occurs, the left and right protection devices are both operated, and the left and right fault recording waves are taken to analyze the fault starting time point.

[0058] The method adopts the recursive least square method to linearly fit the feeder current data of the fault recording wave, and then uses the fitting result to predict the feedback current size at the next time, and compares it with the actually sampled feedback current size. If the prediction results of the points are greatly different from the expected values, and the feeder has voltage, it is considered that the time of the point is the fault starting time.

[0059] The specific fitting method is:

[0060] The fitting target function is y=mx+n;

[0061] Where y is the feeder current size, x is the time, m and n are the parameters to be fitted.

[0062] Take the first 20 points of the recording wave file data, calculate the average value of the first 10 points (x1, y1) and the average value of the last 10 points (x2, y2) respectively, and bring them into the solution parameter Get the initial fitting parameters m and n.

[0063] Then take the data of the third 10 points, calculate the average value (x3, y3), and let b3=(y3),

[0064] Let the previous parameter matrix be:

[0065]

[0066]

[0067] Then the new parameter matrix is

[0068] Where m3, n3 are the new fitting parameters.

[0069] This parameter matrix has no solution, and the least square method is used:

[0070]

[0071] After arrangement:

[0072]

[0073] Then the new fitting parameters

[0074] It is believed that new data is more valuable than old data, so the forgetting factor λ is introduced and λ=0.98 is taken.

[0075] The new fitting parameters

[0076] in

[0077]

[0078] The fitting function y=m3x+n3 (1)

[0079] Take the average value x4 of the abscissa of the fourth 10 points, substitute it into the above formula (1) to obtain the current value y′4 at the time x4 predicted by the fitting, compare it with the actual average value y4 of the sampling values ​​of these 10 points, and take the difference, that is, calculate y4-y′4. If this value does not exceed 1000 (in this embodiment, the threshold range is set to 1000, and the specific value is not limited here. The threshold range obtained in accordance with this embodiment is within the protection scope of this application), it is considered that the actual sampling value meets the expectation, and continue to substitute (x4, y4) to update the fitting parameters.

[0080] If the difference exceeds 1000, this point, that is, the initial point of the fourth 10 points, is considered to be the abnormal current change point. If the feeder voltage at this point is positive, this point is considered to be the fault starting point. If the feeder voltage is negative, this point is considered to be a normal point and is continued to be included in the parameter fitting iteration.

[0081] Do this for both recording files to get two fault starting points, such as Figure 3 and Figure 4 shown.

[0082] The recording file takes the protection action time point as 0, calculates the difference t1 and t2 between the fault starting point and 0 point of the two recording files, and takes the shorter value as the time point for the distance measurement data. Figure 3 and Figure 4 For example, the near-end ΔT is 1.83ms and the far-end ΔT is 18.5ms. Obviously, the time difference at the near-end is greater than that at the far-end. Based on the near-end time point, the voltage and current data at point 0 at the near-end are taken, and the voltage and current data at the far-end 1.83ms after the fault starting point are taken as the calculation point.

[0083] Based on the data obtained at both ends, namely the feeder voltage and current, the fault point location is calculated using the formula:

[0084]

[0085]

[0086] Where L is the distance between traction substations M and N, Lm is the distance between the fault point and the traction substation M, L n is the distance between the fault point and traction substation N. Um and Im are the feeder voltage and current when the DC feeder protection at end M is activated; Un and In are the feeder voltage and current when the DC feeder protection at end N is activated.

[0087] Based on the same inventive concept, corresponding to any of the above-mentioned embodiments and methods, an embodiment of the present application further provides a contact network fault distance measuring device for a subway DC traction power supply system.

[0088] like Figure 5 As shown, the overhead line fault distance measuring device for a subway DC traction power supply system includes:

[0089] The data acquisition module 11 is configured to acquire the fault recording data generated when the bilateral protection device is actuated, wherein the fault recording data includes the feeder voltage and feeder current;

[0090] The prediction module 12 is configured to predict the feeder current at the next moment based on the feeder current at any point in time using a prediction algorithm, and determine the fault starting point of the bilateral protection device in response to the prediction result meeting a preset condition and the feeder having voltage, wherein the prediction algorithm uses a recursive least squares method to perform linear fitting on the feeder current;

[0091] The data processing module 13 is configured to process data of the two fault starting points to obtain ranging data points;

[0092] The distance measurement module 14 is configured to perform fault distance measurement on the feeder voltage and feeder current of the distance measurement data point by using a fault distance measurement algorithm to determine the fault point position of the contact network.

[0093] For the convenience of description, the above devices are described as being divided into various modules according to their functions. Of course, when implementing the embodiments of the present application, the functions of each module can be implemented in the same or multiple software and / or hardware.

[0094] The device of the above embodiment is used to implement the corresponding subway DC traction power supply system contact network fault location method in any of the above embodiments, and has the beneficial effects of the corresponding method embodiment, which will not be repeated here.

[0095] Based on the same inventive concept, corresponding to any of the above-mentioned embodiments and methods, an embodiment of the present application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and runnable on the processor. When the processor executes the program, it implements the subway DC traction power supply system contact network fault ranging method as described in any of the above embodiments.

[0096] Figure 610 is a schematic diagram showing a more specific hardware structure of an electronic device provided in this embodiment. The device may include: a processor 1010, a memory 1020, an input / output interface 1030, a communication interface 1040, and a bus 1050. The processor 1010, the memory 1020, the input / output interface 1030, and the communication interface 1040 are communicatively connected to each other within the device via the bus 1050.

[0097] The processor 1010 can be implemented using a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this specification.

[0098] The memory 1020 can be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory), static storage devices, dynamic storage devices, etc. The memory 1020 can store an operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 1020 and is called and executed by the processor 1010.

[0099] The input / output interface 1030 is used to connect an input / output module to implement information input and output. The input / output module can be configured as a component in the device (not shown in the figure) or can be externally connected to the device to provide corresponding functions. Input devices may include a keyboard, mouse, touch screen, microphone, various sensors, etc., and output devices may include a display, speaker, vibrator, indicator light, etc.

[0100] The communication interface 1040 is used to connect to a communication module (not shown) to enable communication between the device and other devices. The communication module can communicate via a wired method (such as USB, network cable, etc.) or a wireless method (such as mobile network, WiFi, Bluetooth, etc.).

[0101] The bus 1050 comprises a pathway for transmitting information between the various components of the device (eg, the processor 1010 , the memory 1020 , the input / output interface 1030 , and the communication interface 1040 ).

[0102] It should be noted that although the above device only shows the processor 1010, the memory 1020, the input / output interface 1030, the communication interface 1040, and the bus 1050, in a specific implementation, the device may also include other components necessary for normal operation. In addition, it will be understood by those skilled in the art that the above device may only include the components necessary to implement the embodiments of this specification, and does not necessarily include all the components shown in the figure.

[0103] The electronic device of the above embodiment is used to implement the corresponding subway DC traction power supply system contact network fault location method in any of the above embodiments, and has the beneficial effects of the corresponding method embodiment, which will not be repeated here.

[0104] Based on the same inventive concept, corresponding to any of the above-mentioned embodiment methods, the present application also provides a non-transitory computer-readable storage medium, which stores computer instructions, and the computer instructions are used to enable the computer to execute the subway DC traction power supply system contact network fault ranging method as described in any of the above embodiments.

[0105] The computer-readable media of this embodiment include permanent and non-permanent, removable and non-removable media that can be used to store information by any method or technology. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, read-only compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device.

[0106] The computer instructions stored in the storage medium of the above embodiment are used to enable the computer to execute the subway DC traction power supply system contact network fault location method as described in any of the above embodiments, and have the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0107] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. Within the scope of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0108] In addition, to simplify the description and discussion, and so as not to obscure the embodiments of the application with details that are well known to those skilled in the art, the drawings may or may not show some well-known power / ground connections, does not attempt to describe the embodiments of the application in full detail with formality, and this also takes into account the fact that the relevant art will be or is already more fully set forth in the accompanying drawings and the appended claims. The description is thus to be regarded as illustrative in nature, and not as restrictive, inasmuch as the embodiments of the application are capable of being embodied in a variety of forms as will be obvious to those of skill in the art having the benefit of this disclosure.

[0109] While the application has been described in connection with specific embodiments thereof, it will be understood that many modifications, substitutions and changes will be apparent to those of ordinary skill in the art to which the application pertains. For example, other memory architectures (e.g., dynamic RAM (DRAM)) can use the embodiments discussed.

[0110] It is intended that the embodiments of the application encompass all such substitutions, modifications and variations as fall within the scope of the appended claims. Accordingly, any one or more features of any embodiment of the application can be combined with any one or more features of any other embodiment of the application, or any application, in any manner consistent with the application. Therefore, the application should not be limited by the foregoing description, but should be defined in accordance with the appended claims and their equivalents.

Claims

1. A method for fault location of a contact network in a DC traction power supply system for a subway, wherein the DC traction power supply system for the subway is provided with bilateral power supply by two traction substations, wherein: Two traction substations include traction substation M and traction substation N. In response to a contact network short-circuit fault, bilateral protection devices are triggered to operate simultaneously. The method is characterized in that it includes: Acquire fault recording data generated when the bilateral protection device is actuated, wherein the fault recording data includes feeder voltage and feeder current; Based on the feeder current at any point in time, the feeder current at the next moment is predicted by a prediction algorithm. In response to the prediction result satisfying a preset condition and the feeder having voltage, the fault starting point of the bilateral protection device is determined, wherein the prediction algorithm uses a recursive least squares method to perform linear fitting on the feeder current, including: Obtaining the feeder current at any point in time, performing linear fitting on the feeder current by fitting the objective function, and updating and iterating the fitting parameters to predict the feeder current at the next moment; Comparing the feeder current at the next moment with the actually sampled feeder current, and in response to the comparison result satisfying a preset threshold range and the feeder having voltage, determining that point as the fault starting point; Data processing is performed on the two fault starting points to obtain ranging data points, including: Taking time axis 0 as the protection action time point and the protection action time point as the reference point, respectively calculate the time difference between the two fault starting points and the reference point, and select the fault starting point with the smaller time difference as the ranging data point; Fault distance measurement is performed on the feeder voltage and feeder current of the distance measurement data point by using a fault distance measurement algorithm to determine the fault point position of the contact network.

2. The method for measuring fault location of a direct current traction power supply system of a subway according to claim 1, characterized in that: The fitting objective function formula is: y=mx+n; Where y is the feeder current, x is the time, and m and n are the parameters to be fitted.

3. The method for measuring fault location of a direct current traction power supply system of a subway according to claim 1, characterized in that: Also includes: In response to the absence of voltage on the feeder, the point is determined to be a normal point, and the fitting parameters are continuously updated and iterated until the fault starting point is obtained.

4. The method for measuring fault location of a direct current traction power supply system of a subway according to claim 1, characterized in that: The method of performing fault distance measurement on the feeder voltage and feeder current of the distance measurement data point by using a fault distance measurement algorithm to determine the fault point position of the contact network includes: Where, L is the distance between traction substation M and traction substation N, L m is the distance between the fault point and the traction substation M, L n is the distance between the fault point and the traction substation N, Um and Im are the feeder voltage and feeder current at the M-side of the traction substation when the DC feeder protection is activated, and Un and In are the feeder voltage and feeder current at the N-side of the traction substation when the DC feeder protection is activated.

5. A device for measuring catenary faults in a DC traction power supply system for a subway, wherein the DC traction power supply system for the subway is provided with bilateral power supply by two traction substations, wherein: The two traction substations include traction substation M and traction substation N. In response to a contact network short-circuit fault, the bilateral protection devices are triggered to operate simultaneously, which are characterized by including: A data acquisition module is configured to acquire fault recording data generated when the bilateral protection device is actuated, wherein the fault recording data includes feeder voltage and feeder current; The prediction module is configured to predict the feeder current at the next moment based on the feeder current at any point in time using a prediction algorithm, and determine the fault starting point of the bilateral protection device in response to the prediction result meeting a preset condition and the feeder having voltage, wherein the prediction algorithm uses a recursive least squares method to perform linear fitting on the feeder current, including: Obtaining the feeder current at any point in time, performing linear fitting on the feeder current by fitting the objective function, and updating and iterating the fitting parameters to predict the feeder current at the next moment; Comparing the feeder current at the next moment with the actually sampled feeder current, and in response to the comparison result satisfying a preset threshold range and the feeder having voltage, determining that point as the fault starting point; The data processing module is configured to process data of the two fault starting points to obtain ranging data points, including: Taking time axis 0 as the protection action time point and the protection action time point as the reference point, respectively calculate the time difference between the two fault starting points and the reference point, and select the fault starting point with the smaller time difference as the ranging data point; The ranging module is configured to perform fault ranging on the feeder voltage and feeder current of the ranging data point by using a fault ranging algorithm to determine the fault point position of the contact network.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the method for measuring fault location of the overhead line of a subway DC traction power supply system according to any one of claims 1 to 4 is implemented.

7. A non-transitory computer-readable storage medium, characterized in that in, The non-transitory computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the subway DC traction power supply system contact network fault location method according to any one of claims 1 to 4.

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