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Single-ended traveling wave ultra-high-speed protection system and method for flexible direct-current transmission line

A technology for DC transmission lines and transmission lines, which is used in emergency protection circuit devices, measuring electricity, electrical components, etc., can solve the problems of weak resistance to transition resistance and weak anti-noise ability, and achieve the effect of high sensitivity and high reliability

Active Publication Date: 2020-03-24
XI AN JIAOTONG UNIV +1
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AI Technical Summary

Problems solved by technology

Traveling wave protection mainly adopts the single-ended traveling wave protection principle of ABB and SIEMENS, and the action time is several milliseconds, which meets the quick action requirements, but the transition resistance and anti-noise capabilities of the two protection methods are relatively weak

Method used

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  • Single-ended traveling wave ultra-high-speed protection system and method for flexible direct-current transmission line
  • Single-ended traveling wave ultra-high-speed protection system and method for flexible direct-current transmission line
  • Single-ended traveling wave ultra-high-speed protection system and method for flexible direct-current transmission line

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Embodiment Construction

[0052] The present invention provides a single-end traveling wave ultra-high-speed protection method for a flexible direct current transmission line. Through analysis, it is obtained that the first traveling wave expression of the zero-mode fault current at the protection installation place at the head end of the line has y=-ae (-bx)The form of +c. Among them, the parameter b becomes smaller as the fault distance increases. At the same time, due to the effect of the current-limiting reactor at the boundary of the flexible DC transmission line, the parameter b obtained by fitting will drop significantly when the converter side (outside) of the current-limiting reactor is faulty. Construct the basic fitting function p(t)=-ae from this (-bt) +c Fit the first traveling wave of zero-mode fault current measured at the protection installation at the head end of the line to obtain the parameter b reflecting the fault location, so as to realize the discrimination of faults inside and ...

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Abstract

The invention discloses a single-ended traveling wave ultra-high-speed protection system and method for a flexible direct-current transmission line, and the method comprises the steps: measuring the current and voltage of a protection installation part of a direct-current transmission line, and determining a zero-mode fault current first traveling wave; calibrating the arrival time of the first traveling wave of the zero-mode fault current by utilizing wavelet transform, and starting protection; measuring zero-mode fault current after protection is started, performing reflected wave identification by using wavelet transform, and adaptively changing the length of a data window of protection calculation; constructing a basic fitting function according to the zero-mode fault current first traveling wave expression form, and fitting the obtained zero-mode fault current first traveling wave by using a Levenberg-Marquardt optimization algorithm to obtain a fitting coefficient b; and judgingwhether the obtained b value meets a protection criterion or not to realize protection under different fault conditions. Parameters reflecting fault positions are obtained through fitting, and the method has high-speed mobility, high reliability and high sensitivity.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a single-end traveling wave ultra-high-speed protection system and method for a flexible DC transmission line. Background technique [0002] The flexible DC transmission technology based on the voltage source converter has the advantages of flexible power control and low harmonic content in the system, and has obvious advantages in the technical fields of clean energy grid connection, island power supply, and asynchronous grid interconnection. In the future, my country's flexible DC power transmission will develop in the direction of long-distance, large-capacity, and multi-terminal. After a fault occurs on the flexible DC transmission line, each converter station immediately feeds short-circuit current to the fault point, and the fault current rises rapidly and has a large amplitude, which will cause serious damage to the DC system. Th...

Claims

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Application Information

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IPC IPC(8): H02H7/26G01R31/08
CPCG01R31/085G01R31/088H02H7/268
Inventor 宋国兵张晨浩王婷赵乐
Owner XI AN JIAOTONG UNIV
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