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High-voltage DC transmission line protection method based on waveform similarity of traveling waves

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: 2019-10-25
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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  • High-voltage DC transmission line protection method based on waveform similarity of traveling waves
  • High-voltage DC transmission line protection method based on waveform similarity of traveling waves
  • High-voltage DC transmission line protection method based on waveform similarity of traveling waves

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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 disclose a high-voltage DC transmission line protection method based on the waveform similarity of traveling waves, and relates to the field of high-voltage DC transmission line fault detection. The similarity between the waveform of a rectification side linear-mode forward traveling wave and the waveform of an inversion side linear-mode backward traveling wave of a DC transmission line is high when a fault occurs outside the area, and the similarity is low when a fault occurs inside the area. The voltage and current of the rectification side and the inversion side are respectively collected, and the rectification side linear-mode forward traveling wave and the inversion side linear-mode backward traveling wave are obtained by calculation; the start of protection is detectedby using the voltage gradient; after the protection is started, the linear-mode forward traveling wave is transmitted to the inversion side at the rectification side, and the liner-mode backward traveling wave is transmitted to the rectification side at the inversion side; the improved DTW distance between the rectification side linear-mode forward traveling wave and the inversion side linear-modebackward traveling wave is calculated respectively at the rectification side and the inversion side, and a fault criterion of the DC transmission line is established. The method can accurately identify various faults of the DC transmission line, and has good synchronous resistance, strong transition resistance and certain noise and abnormal data resistance.

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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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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