A Fault Pole Selection Method Using Constructed Unbalanced Directional Voltage

A technology of balance and voltage, which is applied in the direction of fault location and fault detection according to conductor type, can solve the problems of identifying interference and insufficient discrimination, and achieves the effect of simple algorithm, favorable for reliable pole selection, and simple logical structure

Active Publication Date: 2022-02-11
KUNMING UNIV OF SCI & TECH
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  • 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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  • A Fault Pole Selection Method Using Constructed Unbalanced Directional Voltage
  • A Fault Pole Selection Method Using Constructed Unbalanced Directional Voltage
  • A Fault Pole Selection Method Using Constructed Unbalanced Directional Voltage

Examples

Experimental program
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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 faulty pole selection method utilizing structural unbalanced directional voltage, and belongs to the technical field of DC transmission line faulty pole selection. Firstly, read the measurement terminal voltage of the positive and negative bipolar lines obtained by the high-speed acquisition device at the measurement terminal; secondly, construct the unbalanced direction voltage for the obtained voltage, and calculate the attenuation energy according to the waveform of the unbalanced direction voltage, and then The energy of the unbalanced direction voltage attenuation of the positive line is compared with the energy of the unbalanced direction voltage attenuation of the negative line, and the fault pole is obtained according to the ratio. If the ratio is greater than 2, it is a positive line fault; if the ratio is less than 0.5, then It is a negative line fault; if the ratio is between 0.5 and 2, it is a two-pole line fault.

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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Patent Type & Authority Patents(China)
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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