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Fault pole selection method based on construction of unbalanced directional voltages

A technology of balance and voltage, applied in the direction of fault location, fault detection according to conductor type, etc., can solve the problems of identification interference, insufficient discrimination, etc., and achieve the effect of simple algorithm, reliable pole selection, and obvious energy difference

Active Publication Date: 2019-12-31
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, our pole selection was based on the simulation analysis of the coupling characteristics of the UHV DC bipolar transmission line and its influencing factors, and then proposed the method of using the bipolar voltage ratio to select the pole, but it is still another method for minor faults in this pole. Insufficient discrimination of extremely serious faults, causing great interference to identification

Method used

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  • Fault pole selection method based on construction of unbalanced directional voltages
  • Fault pole selection method based on construction of unbalanced directional voltages
  • Fault pole selection method based on construction of unbalanced directional voltages

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Embodiment 1: A certain 1100kV DC transmission line simulation model is as follows figure 1 shown. Its line parameters are as follows: The total length of the direct current transmission line is 3300km. Fault location: The positive line is 100km away from the M terminal. Sampling frequency is 10kHz

[0051] (1) Obtain the fault voltage waveform and data at the measurement terminal according to the first step in the manual, the waveform is as follows figure 2 shown.

[0052] (2) According to the second step in the manual, the unbalanced direction voltage can be obtained, and the waveform is as follows image 3 shown.

[0053] (3) According to the calculation formula of unbalanced direction voltage attenuation energy in the third step to the fourth step of the instruction manual, the attenuation energy P of the measuring terminal voltage of the bipolar line is obtained + and P - and K j ,As shown in Table 1.

[0054] (4) According to the fifth step in the manual...

Embodiment 2

[0057] Embodiment 2: A certain 1100kV DC transmission line simulation model is as follows figure 1 shown. Its line parameters are as follows: The total length of the direct current transmission line is 3300km. Fault location: The fault occurred on the negative pole line 750km away from the N terminal. The sampling frequency is 10kHz.

[0058] (1) Obtain the fault voltage waveform and data at the measurement terminal according to the first step in the manual, the waveform is as follows Figure 4 shown.

[0059] (2) According to the second step in the manual, the unbalanced direction voltage can be obtained, and the waveform is as follows Figure 5 shown.

[0060] (3) According to the calculation formula of unbalanced direction voltage attenuation energy in the third step to the fourth step of the instruction manual, the attenuation energy P of the measuring terminal voltage of the bipolar line is obtained + and P - and K j ,As shown in table 2.

[0061] (4) According t...

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Abstract

The invention relates to a fault pole selection method based on the construction of unbalanced directional voltages and belongs to the technical field of direct-current transmission line fault pole selection. According to the method, the measurement end voltages of a positive pole line and a negative pole line, which are acquired by a high-speed acquisition device of a measurement end are read; ad; unbalanced directional voltages are constructed for the acquired voltages; the attenuated energy of the unbalanced directional voltages is calculated according to the waveforms of the unbalanced directional voltages; the ratio of the attenuated energy of the unbalanced directional voltage of the positive pole line and the attenuated energy of the unbalanced directional voltage of the negative pole line is calculated; a fault pole is obtained according to the ratio; and if the ratio is larger than 2, it is determined that the positive pole line breaks down; if the ratio is smaller than 0.5, it is determined that the negative pole line breaks down; and if the ratio is between 0.5 and 2, it is determined that the positive pole line and the negative pole line break down.

Description

technical field [0001] The invention relates to a faulty pole selection method utilizing structural unbalanced directional voltage, and belongs to the technical field of DC transmission line faulty pole selection. Background technique [0002] HVDC transmission plays an important role in long-distance and high-power transmission due to its large transmission capacity, low line cost, and good control performance. Due to the long transmission distance of the HVDC transmission system, the transient harmonic content after the fault is rich, which makes the coupling effect between the poles of the transmission line significant. Inductive electric quantity is generated in the healthy pole circuit, which causes the protection malfunction of the healthy pole line, so it is particularly important to select the pole reliably. In the past, our pole selection was based on the simulation analysis of the coupling characteristics of the UHV DC bipolar transmission line and its influencing...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/085
Inventor 束洪春张雪飞王璇
Owner KUNMING UNIV OF SCI & TECH
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