A kind of fault location method of multiple-line direct traction network, electric power instrument and medium

Abstract

The application discloses a kind of multiple-line direct supply traction network fault location method, electric power instrument and medium, the method includes: collecting the traction network electrical data before failure and the traction network electrical data after failure;According to the electrical data collected, calculate the traction network electrical data variation;According to the traction network electrical data variation, obtain the voltage effective value of downlink traction network;According to the traction network electrical data variation, ground unit reactance, unit self-impedance, unit mutual impedance and other parameters, obtain the fault point voltage variation;According to the fault point voltage variation, obtain the effective value function of downlink traction network voltage variation variation;The effective value function of downlink traction network voltage variation variation is solved, and the fault distance is obtained.The application can timely and accurately identify fault position, further improve fault location accuracy, effectively improve the reliability of traction network operation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electrified railway traction power supply, and particularly relates to a method for locating faults of a direct-supply traction network of a double-track line, an electric power instrument and a medium. BACKGROUND

[0002] With the rapid development of China's economy, in order to meet the characteristics of large passenger flow and short interval of city rail transit, AC25kV power supply system is widely used in China's city rail transit, and the direct-supply double-track traction network has simple structure and high reliability of power supply, and is the main structure of city rail traction network. At present, the method for locating faults of the direct-supply double-track traction network is impedance method, which ignores the mutual impedance between the uplink and downlink traction networks and the ground capacitance of the traction network. With the increase of the fault distance of the traction network, the fault location error will also increase, which seriously delays the fault maintenance speed. SUMMARY

[0003] In order to overcome the above technical defects, the present application provides a method for locating faults of a direct-supply double-track traction network, which improves the fault location accuracy and effectively improves the reliability of the traction network operation.

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

[0005] A method for locating faults of a direct-supply double-track traction network, comprising:

[0006] collecting electrical data of the traction network before the fault and electrical data of the traction network after the fault;

[0007] calculating the change amount of the electrical data of the traction network according to the collected electrical data;

[0008] obtaining the effective value of the voltage of the downlink traction network according to the change amount of the electrical data of the traction network;

[0009] obtaining the change amount of the voltage of the fault point according to the change amount of the electrical data of the traction network, the unit ground capacitance, the unit self-impedance, the unit mutual impedance and other parameters;

[0010] obtaining the effective value function of the change amount of the voltage of the downlink traction network according to the change amount of the voltage of the fault point;

[0011] solving the effective value function of the change amount of the voltage of the downlink traction network to obtain the fault distance.

[0012] Further, the step of collecting the electrical data of the traction network before the fault and the electrical data of the traction network after the fault comprises the following steps:

[0013] Before the fault occurs, collecting the current phasor of the uplink traction network, the current phasor of the downlink traction network, the voltage phasor of the uplink traction network and the voltage phasor of the downlink traction network;

[0014] After the fault occurs, the uplink traction network current phasor, the downlink traction network current phasor, the uplink traction network voltage phasor and the downlink traction network voltage phasor are collected.

[0015] Further, the step of calculating the traction network electrical data variation quantity according to the collected electrical data comprises the steps of:

[0016] According to the uplink traction network current phasor collected before the fault occurs and the uplink traction network current phasor collected after the fault occurs, the uplink traction network current variation quantity is calculated.

[0017] According to the downlink traction network current phasor collected before the fault occurs and the downlink traction network current phasor collected after the fault occurs, the downlink traction network current variation quantity is calculated.

[0018] According to the uplink traction network voltage phasor collected before the fault occurs and the uplink traction network voltage phasor collected after the fault occurs, the uplink traction network voltage variation quantity is calculated.

[0019] According to the downlink traction network voltage phasor collected before the fault occurs and the downlink traction network voltage phasor collected after the fault occurs, the downlink traction network voltage variation quantity is calculated.

[0020] Further, the step of obtaining the voltage effective value of the downlink traction network according to the traction network electrical data variation quantity comprises the steps of:

[0021] According to the downlink traction network voltage variation quantity, the downlink traction network voltage variation quantity effective value is calculated.

[0022] Further, the step of calculating the fault point voltage variation quantity according to the traction network electrical data variation quantity and other parameters comprises the steps of:

[0023] According to the uplink voltage variation quantity, the downlink voltage variation quantity, the uplink current variation quantity, the downlink current variation quantity and other parameters, a fault point voltage variation quantity formula is obtained.

[0024] Further, the other parameters further comprise: fault distance, power supply section length.

[0025] Further, the step of obtaining the effective value function of the downlink traction network voltage variation quantity according to the fault point voltage variation quantity comprises the following steps:

[0026] According to the fault point voltage variation quantity formula, the effective value function of the downlink traction network voltage variation quantity is obtained.

[0027] Compared with the prior art, the present application has the following beneficial effects:

[0028] The present application discloses a kind of double track direct supply traction network fault positioning method, can timely and accurately identify fault position, further improve fault positioning precision, effectively improve the reliability of traction network operation.

[0029] The application also discloses a power meter, comprising:

[0030] a processor;

[0031] a memory for storing the processor-executable instructions;

[0032] The processor is configured to execute the instructions to implement the fault locating method.

[0033] The application also discloses a computer-readable storage medium, which is a computer-readable storage medium, and has a computer program stored thereon, the computer program is executed to implement the fault locating method. BRIEF DESCRIPTION OF DRAWINGS

[0034] The specific embodiments of the application will be further described in detail below with reference to the accompanying drawings, in which:

[0035] Figure 1 a flow chart of the fault locating method described in Embodiment 1;

[0036] Figure 2 a structural schematic diagram of the power meter described in Embodiment 2. DETAILED DESCRIPTION

[0037] The preferred embodiments of the application will be described below with reference to the accompanying drawings, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the application, and are not used to limit the application.

[0038] Embodiment 1

[0039] As Figure 1 , the embodiment discloses a fault locating method for a multi-line direct supply traction network, the power supply section length is L, and the method comprises the following steps:

[0040] Before the fault occurs, the uplink traction network current phasor of the traction substation is collected the downlink traction network current phasor the uplink traction network voltage phasor of the traction substation the downlink traction network voltage phasor

[0041] After the fault occurs, the uplink traction network current phasor of the traction substation is collected the downlink traction network current phasor the uplink traction network voltage phasor of the traction substation the downlink traction network voltage phasor

[0042] According to the acquired uplink traction network current phasor before and after the fault occurs, the uplink traction network current variation is calculated

[0043] According to the acquired downlink traction network current phasor before and after the fault occurs, the downlink traction network current variation is calculated

[0044] According to the acquired uplink traction network voltage phasor before and after the fault occurs, the uplink traction network voltage variation is calculated

[0045] According to the acquired downlink traction network voltage phasor before and after the fault occurs, the downlink traction network voltage variation is calculated

[0046] According to the downlink traction network voltage variation The effective value M of the downlink traction network voltage variation is calculated c = |ΔU2|.

[0047] According to the uplink and downlink voltage variations, the uplink and downlink current variations and other parameters, the fault point voltage variation formula is obtained, assuming that the fault distance is an unknown quantity x, the fault distance value range is x ∈ [0, L], and the fault point voltage variation is ΔU f :

[0048]

[0049]

[0050] The effective value function M(x) of the downlink traction network voltage variation is obtained by simultaneously solving the fault point voltage variation formulas (1) and (2), M(x) is a function of the fault distance x:

[0051]

[0052] Wherein,

[0053] The effective value function M(x) is solved, all solutions of M(x) are calculated, and the M(x) function curve is drawn, and there is x = x g in the curve, so that M(x g ) = Mc, and the fault distance x g is obtained.

[0054] The application considers the mutual impedance between the uplink traction network and the downlink traction network and the influence of the traction network on the ground capacity resistance, and further improves the fault positioning accuracy; only the traction network voltage and current of the traction substation port need to be measured, the fault position can be accurately identified in time, and the data synchronous collection and communication between substations are not required; and the algorithm principle is simple and reliable, easy to implement, and can be directly applied to the existing measurement and control system, and is convenient for engineering practice.

[0055] Embodiment 2

[0056] As Figure 2 The embodiment discloses a power meter, comprising: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to execute the instructions to implement the fault positioning method in embodiment 1.

[0057] Embodiment 3

[0058] The embodiment discloses a computer-readable storage medium, which is a computer-readable storage medium, and a computer program is stored on the computer-readable storage medium. The computer program is executed to implement the fault positioning method in embodiment 1.

[0059] Optionally, the computer-readable storage medium can include a read-only memory (ROM), a random access memory (RAM), a solid state disk (SSD), or an optical disk. The random access memory can include a resistance random access memory (ReRAM) and a dynamic random access memory (DRAM).

[0060] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Any modification, equivalent change and modification of the above embodiment without departing from the technical solution of the present application, according to the technical essence of the present application, all still belong to the scope of the technical solution of the present application.

Claims

1. A method for fault location in a double-track direct-supply traction network, characterized in that, include: Collect traction network electrical data before and after the fault; Based on the collected electrical data, calculate the changes in the electrical data of the traction network; Based on the changes in the electrical data of the traction network, the effective voltage value of the downstream traction network is obtained, including the following steps: Calculate the effective value of the voltage change in the downlink traction network based on the voltage change in the downlink traction network; Based on the changes in traction network electrical data, unit capacitive reactance to ground, unit self-impedance, unit mutual impedance, fault distance, and power supply section length, the voltage change at the fault point is obtained, including the following steps: Based on the changes in upstream voltage, downstream voltage, upstream current, downstream current, fault distance, and power supply section length, the formula for the voltage change at the fault point is obtained. Let the fault distance be an unknown quantity x, with the range of x∈[0,L], and the voltage change at the fault point be ΔU. f : Wherein, ΔU1 is the change in voltage of the uplink traction network, x is the fault distance, ΔI1 is the change in current of the uplink traction network, ΔI2 is the change in current of the downlink traction network, and ΔU2 is the change in voltage of the downlink traction network. Based on the formulas (1) and (2) for the voltage change at the fault point, the effective value function M(x) of the voltage change in the downlink traction network is obtained, where M(x) is a function of the fault distance x: in, The effective value function of the voltage change in the downlink traction network is solved to obtain the fault distance.

2. The fault location method according to claim 1, characterized in that, The steps for collecting traction network electrical data before and after the fault include the following: Before the fault occurred, the uplink traction network current phasor, downlink traction network current phasor, uplink traction network voltage phasor, and downlink traction network voltage phasor were collected. After the fault occurs, the uplink traction network current phasor, downlink traction network current phasor, uplink traction network voltage phasor, and downlink traction network voltage phasor are collected.

3. The fault location method according to claim 2, characterized in that, The steps involve calculating the changes in traction network electrical data based on the collected electrical data, including the following steps: The change in the uplink traction network current is calculated based on the uplink traction network current phasor collected before and after the fault. The change in downlink traction network current is calculated based on the downlink traction network current phasor collected before and after the fault. Calculate the change in uplink traction network voltage based on the collected uplink traction network voltage phasors before and after the fault. The change in downlink traction network voltage is calculated based on the downlink traction network voltage phasors collected before and after the fault.

4. An electrical meter, characterized in that, include: processor; Memory used to store the processor's executable instructions; The processor is configured to execute the instructions to implement the fault location method as described in any one of claims 1-3.

5. A computer-readable storage medium, characterized in that, It is a computer-readable storage medium on which a computer program is stored, which, when executed, implements the fault location method as described in any one of claims 1-3.

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