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A traveling wave fault location method for double-circuit DC lines on the same tower based on single-circuit information

A technology of DC lines and double circuits on the same tower, which is applied to fault locations, emergency protection circuit devices, electrical components, etc., can solve the problems of complex electromagnetic coupling characteristics of faults and fault location algorithms that are no longer applicable to double circuits on the same tower. , to achieve the effect of less computation, high reliability and high accuracy

Active Publication Date: 2018-02-23
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for double-circuit DC transmission lines on the same tower, due to the existence of line-to-line coupling and phase-to-phase coupling at the same time, and the line does not adopt symmetrical transposition measures, the fault electromagnetic coupling characteristics of double-circuit DC transmission lines on the same tower are very complicated and cannot be simple ground as a balanced line,
[0004] Therefore, the existing traditional phase-mode conversion method and fault location algorithm for single-circuit DC transmission lines are no longer applicable to double-circuit DC lines on the same tower. Transmission line transformation matrix and its applicable fault location algorithm

Method used

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  • A traveling wave fault location method for double-circuit DC lines on the same tower based on single-circuit information
  • A traveling wave fault location method for double-circuit DC lines on the same tower based on single-circuit information
  • A traveling wave fault location method for double-circuit DC lines on the same tower based on single-circuit information

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Embodiment

[0043] Such as figure 1 As shown, using PSCAD / EMTDC simulation software, construct the model of ±500kV double-circuit DC transmission system on the same tower in Xiluodu, Guangdong. The tower structure is as follows: figure 2 As shown; the model of the double-circuit bipolar DC transmission line on the same tower adopts the Frequency Dependent Model (Frequency Dependent Model), the total length of the line is 1254km; the sampling frequency is 1MHz, and the unipolar fault is set to occur at different positions of 1N, and the fault transition resistance includes metal grounding and grounding through a 500Ω transition resistance; the system utilizes the fault location method of the present invention, which specifically includes the following steps:

[0044] S1. Extract the unit impedance matrix and unit admittance matrix: According to the model of the tower, the unit impedance matrix of the double-circuit DC transmission line on the same tower [Z phase ] and the unit admittance...

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Abstract

The invention discloses a single-circuit information based method for locating traveling wave faults of double-circuit DC lines on a same tower. The method comprises steps as follows: 1, constructing a phase-mode transformation matrix by using an impedance matrix and an admittance matrix to obtain a voltage decoupling matrix; 2, obtaining a single-circuit voltage transformation matrix with the third line modulus eliminated according to the obtained voltage decoupling matrix; 3, obtaining the time for fault voltage traveling wave component wave heads to arrive at head and tail ends after decoupling of the single-circuit transformation matrix with a signal processing method; 4, constructing fault location criteria based on single-circuit information. The method has the advantages that the method is high in response speed, high in reliability, small in operation amount, easy to implement, capable of improving the fault location accuracy and the like.

Description

technical field [0001] The present invention relates to a distance measuring method for double-circuit direct current transmission lines on the same tower, in particular to a traveling-wave fault location method for double-circuit direct current transmission lines on the same tower based on single-circuit information. A distance measurement method of traveling waves at both ends of the single-circuit measurement data of the DC line. Background technique [0002] Compared with high-voltage AC transmission, HVDC transmission has the advantages of large transmission capacity, flexible and rapid control, large unipolar transmission power, and low line cost. It is widely used in long-distance large-capacity power transmission and asynchronous grid interconnection. With the continuous development of the economy, the land resources are becoming more and more tense. The double-circuit DC transmission line on the same tower has been widely concerned by various countries and has recei...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCH02H7/265
Inventor 李海锋郭履星蔡颖倩麦国浩梁远升
Owner SOUTH CHINA UNIV OF TECH
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