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Mixed modulus time domain fault positioning method for identical-tower double-loop direct current line

A technology of double-circuit and DC lines on the same tower, applied in the direction of the fault location, etc., can solve the problems of complex electromagnetic coupling characteristics of faults on double-circuit DC transmission lines on the same tower, inability to process lines, and non-use of symmetrical transposition measures, etc.

Inactive Publication Date: 2015-02-11
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, the current fault location methods for DC lines are limited to single-circuit DC lines, and are based on the basic premise that the transmission line is a symmetrical structure.
However, for double-circuit DC transmission lines on the same tower, the fault electromagnetic coupling characteristics of double-circuit DC transmission lines on the same tower are very complicated due to the existence of line-to-line coupling and phase-to-phase coupling at the same time; The tower double-circuit DC line does not adopt symmetrical transposition measures, that is, the line cannot be simply treated as a balanced line
Therefore, the existing phase-mode transformation method and fault location algorithm for single-circuit DC transmission lines are no longer applicable to double-circuit DC lines on the same tower, and it is urgent to study the applicable fault location method according to the characteristics of double-circuit DC transmission lines on the same tower

Method used

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  • Mixed modulus time domain fault positioning method for identical-tower double-loop direct current line
  • Mixed modulus time domain fault positioning method for identical-tower double-loop direct current line
  • Mixed modulus time domain fault positioning method for identical-tower double-loop direct current line

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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), and the total length of the line is 1254km; it is set that unipolar faults occur at different positions, and the fault transition resistance includes metallic grounding and via 100Ω, 300Ω , 500Ω transition resistance grounding; the system utilizes the fault location method of the present invention, specifically comprising the following steps:

[0044] S1. Extract unit impedance matrix and unit admittance matrix:

[0045] According to the model of the tower, the unit impedance matrix [Z phase ] and the unit admittance matrix [Y phase ]:

[0046] Z phase ...

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Abstract

The invention discloses a mixed modulus time domain fault positioning method for an identical-tower double-loop direct current line. The method comprises the following steps that 1, a phase-mode transformation matrix is constructed through an impedance matrix and an admittance matrix, and a voltage decoupling matrix and a current decoupling matrix are built; 2, according to the obtained voltage decoupling matrix and the current decoupling matrix, the voltage and the current obtained at the two ends of the line are subjected to decoupling conversion, each modulus voltage and modulus current of the identical-tower double-loop direct current line are worked out, and the line modulus voltage component and the line modulus current component are extracted; 3, the way-side voltage distribution at the two ends of the line is calculated; 4, the fault positioning criterion based on the mixed modulus is constructed. The mixed modulus time domain fault positioning method has the advantages that the fault positioning precision is high, the reliability is high, the calculation quantity is small, the realization is easy, and the like.

Description

technical field [0001] The invention relates to a fault location method for a double-circuit direct current transmission line on the same tower, in particular to a mixed-modulus time-domain fault location method for a double-circuit direct current transmission line on the same tower. Background technique [0002] Compared with high-voltage AC transmission, high-voltage direct current transmission has the advantages of large transmission capacity, flexible and rapid control, and no synchronization and stability problems. With the continuous development of the economy, land resources are becoming more and more tense, which leads to an increase in the construction cost of the transmission network. The double-circuit DC transmission line on the same tower has the characteristics of small transmission corridor and fast construction speed, which can effectively alleviate the above contradictions and have significant economic and social benefits. Therefore, it has attracted extensi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 李海锋丘映丹梁远升郭履星武霁阳王钢
Owner SOUTH CHINA UNIV OF TECH
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