A bilateral full-parallel AT contact network grounding fault location method, device and medium

Abstract

The present invention discloses a method, device, and medium for locating grounding faults in bilateral, fully parallel AT catenary systems. The method comprises the following steps: after a fault occurs, collecting the catenary voltage phasors at the beginning and end of each AT segment; determining the faulty AT segment based on the voltage phasors at the beginning and end of the AT segment; collecting the voltage phasors and distance data for the faulty AT segment; and determining the fault point based on the voltage phasors and distance data for the faulty AT segment. This embodiment improves fault location accuracy by measuring only the voltages on both sides of the AT segment, eliminating the need for current measurement, and thus addresses the problem of locating grounding faults in the catenary system of bilateral traction power supply systems.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrified railway traction power supply, and in particular relates to a bilateral full-parallel AT overhead contact network grounding fault locating method, equipment and medium. Background Art

[0002] In weak power grid areas in western China, such as the Sichuan-Tibet and Qinghai-Tibet regions, only a few substations can supply power to traction substations. External power transmission lines are extremely long, making traction substation site selection difficult. Furthermore, the high proportion of long and steep slopes, bridges, and tunnels along the lines makes it difficult to implement phase separation in traditional single-sided traction networks. A double-sided traction network can extend power supply distances, reduce the number of traction substations, and eliminate phase separation at the exit of substations, effectively improving traction network reliability. However, due to the traction network's long-term exposure to the harsh, high-altitude, cold environment of the plateau, contact network failures are prone to occur, causing inconvenience in power supply operations. Summary of the Invention

[0003] In order to overcome the above technical defects, the present invention provides a bilateral full-parallel AT contact network grounding fault location method, which can improve the fault location accuracy and provide reliable support for railway operation and maintenance.

[0004] In order to solve the above problems, the present invention is implemented according to the following technical solutions:

[0005] A method for locating a ground fault in a bilateral fully parallel AT overhead contact network comprises the following steps:

[0006] After a fault occurs, collect the voltage phasors of the contact network at the head end and the end end of each AT segment;

[0007] Determine the fault AT segment based on the voltage phasor of the first and last contact network.

[0008] Collect voltage phasor and distance data of the fault AT segment;

[0009] The fault point location is determined based on the voltage phasor and distance data of the fault AT segment.

[0010] Furthermore, the step of determining the fault AT segment according to the first-end contact network voltage phasor and the terminal contact network voltage phasor includes the following steps:

[0011] Calculate the average voltage at both ends of each AT segment based on the collected contact network voltage phasors at the head and end of each AT segment;

[0012] According to the calculation results, the faulty AT segment is determined.

[0013] Furthermore, the step of determining the faulty AT segment according to the calculation result includes the following steps:

[0014] Get the minimum average voltage;

[0015] The AT segment corresponding to the minimum average voltage is determined as the faulty AT segment.

[0016] Furthermore, the step of determining the fault point location based on the voltage phasor and distance data of the faulty AT segment includes the following steps:

[0017] Calculate the distance from the fault point to the head end of the fault segment based on the voltage phasor and distance data of the fault AT segment;

[0018] According to the calculation results, the fault point location is determined.

[0019] Furthermore, the voltage phasors of the faulty AT section include: the voltage phasor of the head end of the faulty AT section, the voltage phasor of the terminal end, and the voltage phasor of the contact network of the terminal traction substation;

[0020] Distance data include: distance from the end of the fault section to the right substation, length of the fault section, and traction network sequence impedance.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention discloses a bilateral full-parallel AT catenary grounding fault location method, which can solve the problem of locating grounding faults in the bilateral traction power supply system catenary. It only needs to measure the voltage on both sides of the AT segment without measuring the current. The method is simple, reliable and easy to implement.

[0023] The present invention also discloses a device, comprising:

[0024] processor;

[0025] a memory for storing instructions executable by the processor;

[0026] The processor is configured to execute the instructions to implement the above-mentioned fault location method.

[0027] The present invention also discloses a computer-readable storage medium, which is a computer-readable storage medium and stores a computer program. When the computer program is executed, the above-mentioned fault locating method is implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0029] Figure 1 This is a flowchart of the fault location method described in Example 1;

[0030] Figure 2 This is a schematic diagram of fault segmentation location of the fault location method described in Example 1;

[0031] Figure 3 This is a schematic diagram of fault location of the fault location method described in Example 1;

[0032] Figure 4 This is a schematic structural diagram of the device described in Example 2. DETAILED DESCRIPTION

[0033] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0034] Example 1

[0035] This embodiment discloses a method for locating ground faults in a bilateral full-parallel AT overhead contact network. The entire power supply section is L in length and contains N AT sections, such as Figure 1 , the positioning method includes the following steps:

[0036] After a fault occurs, the voltage phasor of each AT segment n at the head end is collected synchronously in real time. Terminal contact network voltage phasor

[0037] According to the collected voltage phasor of the first-end contact network and terminal contact network voltage phasor Calculate the average voltage across each AT segment n

[0038] Get the minimum average voltage

[0039] The minimum average voltage The corresponding AT segment j is determined to be a faulty AT segment.

[0040] After the faulty AT section is determined, synchronously collect the contact network voltage phasor U1 at the head end of the faulty AT section, the contact network voltage phasor U2 at the end of the faulty AT section, the contact network voltage phasor U3 at the end traction substation, the distance B from the end of the fault section to the right substation, and the length L of the fault section. f , and the four sequence impedances Z0, Z1, Z2, and Z3 of the traction network, calculate the distance x from the fault point to the head end of the fault section:

[0041]

[0042] According to the distance x, the fault point location is determined.

[0043] Since the fault conductors are coupled to each other, it is necessary to use the generalized symmetrical component Figure 2 The segmented positioning diagram is topologically decoupled to obtain Figure 3 Schematic diagram of point positioning.

[0044] Specifically, the minimum average voltage in the step The corresponding AT segment j is determined to be the faulty AT segment. Since the voltage across the AT end where the ground fault occurs is the lowest in the bilateral power supply system, when the minimum average voltage is When , j is the fault AT segment.

[0045] This embodiment discloses a bilateral full-parallel AT catenary grounding fault location method, which can solve the problem of locating catenary grounding faults in bilateral traction network power supply systems. It only needs to measure the voltage on both sides of the AT segment, without measuring the current and without the need for additional current transformers. The algorithm principle is simple and reliable, and the implementation is easy. It can be directly applied to existing measurement and control systems, facilitating engineering practice.

[0046] This embodiment can timely and accurately identify the location of the contact network grounding fault, effectively realizes the bilateral full-parallel AT traction network contact network grounding fault positioning, provides support for the operation and maintenance of the bilateral power supply system, improves the fault location accuracy, and provides reliable support for railway operation and maintenance.

[0047] Example 2

[0048] like Figure 4 This embodiment discloses a device, which may be a power meter, comprising:

[0049] processor;

[0050] a memory for storing processor-executable instructions;

[0051] The processor is configured to execute instructions to implement the bilateral full-parallel AT contact network grounding fault location method in Example 1.

[0052] Example 3

[0053] This embodiment discloses a computer-readable storage medium, which is a computer-readable storage medium and stores a computer program. When the computer program is executed, the bilateral full-parallel AT contact network grounding fault location method in Example 1 is implemented.

[0054] Optionally, the computer-readable storage medium may include: a read-only memory (ROM), a random access memory (RAM), a solid-state drive (SSD), or an optical disk, etc. Among them, the random access memory may include a resistance random access memory (ReRAM) and a dynamic random access memory (DRAM).

[0055] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Therefore, any modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A bilateral full parallel AT catenary ground fault location method, characterized in that: The steps include: After a fault occurs, collect the voltage phasors of the contact network at the head end and the end end of each AT segment; Determine the fault AT segment based on the voltage phasor of the first and last contact network. Collect the voltage phasor and distance data of the fault AT section. The voltage phasor of the fault AT section includes the contact network voltage phasor U1 at the beginning of the fault AT section, the contact network voltage phasor U2 at the end of the fault AT section, and the contact network voltage phasor U3 at the end traction substation. The distance data includes the distance B from the end of the fault section to the right substation and the length of the fault section L. f , and the four sequence impedances Z0, Z1, Z2, and Z3 of the traction network; Determine the fault location based on the voltage phasor and distance data of the fault AT segment, including the following steps: According to the voltage phasor and distance data of the fault AT segment, calculate the distance x from the fault point to the beginning of the fault segment: According to the calculation results, the fault point location is determined.

2. The fault location method according to claim 1, characterized in that: The step of determining the fault AT segment according to the first-end contact network voltage phasor and the terminal contact network voltage phasor includes the following steps: Calculate the average voltage at both ends of each AT segment based on the collected contact network voltage phasors at the head and end of each AT segment; According to the calculation results, the faulty AT segment is determined.

3. The fault location method according to claim 2, characterized in that: The step of determining the faulty AT segment according to the calculation result includes the following steps: Get the minimum average voltage; The AT segment corresponding to the minimum average voltage is determined as the faulty AT segment.

4. A device, characterized in that include: processor; a memory for storing instructions executable by the processor; The processor is configured to execute the instructions to implement the fault location method according to any one of claims 1 to 3.

5. A computer-readable storage medium, characterized in that It is a computer-readable storage medium on which a computer program is stored. When the computer program is executed, the fault location method according to any one of claims 1 to 3 is implemented.

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