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.
CN106646129BActive Publication Date: 2019-05-14SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTH CHINA UNIV OF TECH
Publication Date
2019-05-14

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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.
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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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