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A Time-Domain Calculation Method for Transient Traveling Waves of Double-circuit HVDC Transmission Lines on the Same Tower

A technology of DC transmission lines and transient traveling waves, which is applied in the direction of measuring electricity, measuring electrical variables, and detecting faults according to conductor types, which can solve problems such as inability to consider influences.

Active Publication Date: 2019-05-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing DC line traveling wave transient calculation method is unable to consider the influence of this factor

Method used

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  • A Time-Domain Calculation Method for Transient Traveling Waves of Double-circuit HVDC Transmission Lines on the Same Tower
  • A Time-Domain Calculation Method for Transient Traveling Waves of Double-circuit HVDC Transmission Lines on the Same Tower
  • A Time-Domain Calculation Method for Transient Traveling Waves of Double-circuit HVDC Transmission Lines on the Same Tower

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Embodiment Construction

[0076] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0077] Principle of the present invention is as follows:

[0078] According to the uniform transmission line model, the voltage and current of the double-circuit DC line on the same tower satisfy the following relationship:

[0079]

[0080] The four polar lines are denoted by 1P, 1N, 2P, and 2N, 1P, 1N represent the positive pole line and negative pole line of the first circuit, respectively, 2P, 2N represent the positive pole line and negative pole line of the second circuit, respectively.

[0081] Among them, U phase =[U I-P u I-N u II-P u II-N ] T is the line voltage column vector; I phase =[I I-P I I-N I II-P I II-N ] T is the line current column vector; Z and Y are the series impedance matrix and parallel admittance matrix of the transmission li...

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Abstract

The invention discloses a transient traveling wave time domain calculating method of a same-tower double-circuit DC power transmission line. The method includes the following steps of calculating the series impedance matrix Z and the parallel impedance matrix Y of the line at different frequencies, the eigenvector matrixes TU, TI of the matrixes ZY and YZ, and an eigenvalue matrix Lambda; calculating the vector wave impedance matrix Zc-phase and the sequential wave impedance matrix Zc-phase-r according to the matrixes Y, TI, and Lambda; performing vector fitting on the matrixes TU, TI, TU-1, and TI-1 to obtain TU-r, TI-r, TU-r-1, and TI-r-1; performing vector fitting on the propagation coefficients exp (-gamma Mm) of the forward wave of different moduli to obtain a sequential propagation coefficient matrix Hm-r of the corresponding m mold; determining the fault type according to the circuit structure of the fault points to write the boundary equation; and calculating the line fault transient electrical amount. The method takes into account the influence of the frequency variation of the line parameters, and solves the problem of the line decoupling caused by the unbalanced same-tower double-circuit DC line.

Description

technical field [0001] The invention belongs to the field of direct current transmission in electric power systems, and in particular relates to a transient traveling wave time-domain calculation method for a double-circuit direct current transmission line on the same tower. Background technique [0002] In the case of increasingly tight resources in the transmission corridor, the two-circuit DC transmission system uses the same transmission corridor, that is, the double-circuit DC line on the same tower, and has obtained specific engineering applications. As an important part of the DC system, the DC transmission line is the component with the highest failure rate in the DC system due to the long transmission distance and complex working environment. Accurate and fast DC line fault identification and fault location can effectively reduce the impact of DC line faults and speed up fault recovery time, thereby ensuring the safe and stable operation of the AC-DC system. At pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088
Inventor 李海锋武霁阳李世波张坤梁远升王钢
Owner SOUTH CHINA UNIV OF TECH
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