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Travelling wave protection method and lightning stroke interference determining method and device of flexible DC system

A traveling wave protection and power transmission system technology, applied in emergency protection circuit devices, fault locations, power transmission AC networks, etc., can solve problems such as low fault judgment efficiency, and achieve improved judgment efficiency, short time consumption, and reduced equipment damage. Effect

Active Publication Date: 2019-02-01
XJ ELECTRIC +2
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Problems solved by technology

[0004] The purpose of the present invention is to provide a traveling wave protection method for a flexible direct current system, a method and a device for judging lightning strike interference, which are used to solve the problem of low efficiency in fault judgment of a flexible direct current transmission system in the prior art

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  • Travelling wave protection method and lightning stroke interference determining method and device of flexible DC system

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Embodiment Construction

[0025] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0026] Embodiment of traveling wave protection method for flexible direct current transmission system

[0027] The invention provides a traveling wave protection method for a flexible direct current transmission system. Firstly, by collecting the voltage signal and current signal of the flexible direct current transmission system, the voltage signal is subjected to S transformation to obtain a two-dimensional complex time-frequency matrix; then according to the two-dimensional complex time The frequency matrix extracts the amplitude of each sampling point in the set frequency range, and judges the change trend of the amplitude of the sample points in the set frequency range. If the change trend of the amplitude meets the set conditions, it is judged that the flexible direct current transmission system line has a lightning strike Interference, if t...

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Abstract

The invention provides a travelling wave protection method and a lightning stroke interference determining method and device of a flexible DC system. Voltage signal of the flexible DC transmission system are collected, and S transformation is carried out on the voltage signals to obtain a 2D multi-time-frequency matrix; and amplitudes of sampling points in the set frequency band are extracted fromthe 2D multi-time-frequency matrix, the change trend of the amplitudes of the sampling points in the set frequency band is determined, if the amplitude change trend satisfies a set condition, it is determined that a lightning stroke interference occurs in a line of the flexible DC transmission system, and otherwise, it is determined that a fault occurs in the flexible DC transmission system, anda travelling wave protection motion is made. According to the methods and device, the computational complexity is low, less time is consumed, a computing process is simple, the travelling wave fault determining efficiency of the DC transmission system is improved, faults can be removed rapidly, equipment damage caused by fault of the power line can be reduced greatly, impact on the AC grid is reduced, power failure loss of the power grid is reduced, severe power failure accidents due to instability of the primary power grid can be prevented, and the reliability of the DC power grid is improved.

Description

technical field [0001] The invention belongs to the technical field of DC transmission relay protection, and in particular relates to a traveling wave protection method for a flexible DC system, a lightning strike interference judgment method and a device. Background technique [0002] With the development of power electronics technology, the flexible DC transmission system has continuously obtained new breakthroughs on this basis. Flexible DC transmission technology is considered to be the development direction of future power transmission. Compared with AC transmission systems, DC systems have high stability and low transmission loss. Especially with the development of high-voltage and large-capacity power devices and the realization of high-voltage DC circuit breakers, DC The grid already has the technical basis to replace the AC grid. Since there is no commutation failure problem in flexible DC transmission, and the voltage harmonic content is small, the output frequency...

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Application Information

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IPC IPC(8): H02H7/26G01R31/08H02J3/36
CPCG01R31/086H02H7/265H02H7/268H02J3/36Y02E60/60
Inventor 李传西黄金海戴国安田培涛吴庆范付艳范子强许朋见霍城辉车强飞陈传奇
Owner XJ ELECTRIC
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