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A HVDC Transmission Line Protection Method Based on Traveling Waveform Similarity

A technology for high-voltage direct current and transmission lines, which is applied to emergency protection circuit devices, electrical components, and fault detection according to conductor types. effect of capacity

Active Publication Date: 2021-05-14
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a high-voltage direct current transmission line protection method based on the similarity of traveling wave waveforms, which can effectively solve the technical problem of identifying internal and external faults in the high-voltage direct current transmission line.

Method used

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  • A HVDC Transmission Line Protection Method Based on Traveling Waveform Similarity
  • A HVDC Transmission Line Protection Method Based on Traveling Waveform Similarity
  • A HVDC Transmission Line Protection Method Based on Traveling Waveform Similarity

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Embodiment

[0118] In this paper, referring to the parameters of the Tianguang HVDC transmission project, a bipolar ±500kV HVDC transmission system model is built in PSCAD / EMTDC. The total length of the transmission line is 960km, the rated current is 1.8kA, and the transmission power is 1800MW. The pulse converter is connected in series, and a 150mH smoothing reactor is connected in series between the DC outlet of the converter and the DC line. The sampling frequency is 10kHz. Assume that the system fails at 0.8s. Set different out-of-area and in-area faults and some bad data included in the sampled data.

[0119] Example 1

[0120] Out-of-area fault simulation. The fault areas outside the area mainly include converter faults, DC field faults, DC filter faults, converter transformer faults, AC filter faults, and AC system faults. There is overlap and equivalence between the above external fault areas, and the protection action threshold is determined by the maximum improved DTW dista...

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Abstract

The invention discloses a high-voltage direct current transmission line protection method based on traveling wave waveform similarity, and relates to the field of high-voltage direct current transmission line fault detection. The similarity between the line-mode forward wave on the rectifier side and the reverse-traveling wave on the inverter side is high when there is a fault outside the zone, and the similarity is low when there is a fault inside the zone. Collect the voltage and current of the rectifier side and inverter side respectively, and calculate the forward wave of the line mode on the rectifier side and the reverse wave of the line mode on the inverter side; use the voltage gradient to detect and start the protection; after the protection starts, the forward wave of the line mode on the rectifier side Transmit to the inverter side, and transmit the line mode reverse traveling wave to the rectification side on the inverter side; calculate the improved DTW distance between the rectification side line mode forward wave and the inverter side line mode reverse traveling wave on the rectification side and inverter side respectively , to establish the fault criterion of the DC transmission line. The method can accurately identify various faults of the direct current transmission line, has better anti-synchronization characteristics, strong anti-transition resistance ability, and has certain anti-noise and abnormal data ability.

Description

technical field [0001] The invention relates to the technical field of fault area detection of a high-voltage direct current transmission line. Background technique [0002] With the expansion of the scale of the interconnected power grid and the continuous increase of the voltage level, the traditional backup protection based on local information has complex setting coordination and long action delays, which is difficult to meet the requirements of safe operation of the power grid. It may accidentally cut off the normal line, and its sensitivity will also be affected by high-resistance ground faults. In recent years, with the development of wide-area measurement systems, wide-area backup protection using wide-area information to detect faulty components has attracted the attention of scholars at home and abroad, and many wide-area backup protection algorithms have been proposed. [0003] Suonan Jiale, Liu Kai, Su Xiaohua, etc. A new principle of comprehensive impedance lon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26G01R31/08
CPCG01R31/086H02H7/268Y04S10/52
Inventor 童晓阳杨明杰
Owner SOUTHWEST JIAOTONG UNIV
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