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Method for calculating DC side harmonic current of common-tower double-circuit DC transmission line

A DC transmission line and double-circuit technology on the same tower, which can reduce harmonics/ripples and other directions when applied to DC circuits, and can solve problems that cannot be further promoted

Inactive Publication Date: 2011-08-17
ZHEJIANG UNIV
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Problems solved by technology

The calculation of harmonic currents on the DC side of DC transmission lines is the basis of DC filter design. The existing method is to decompose the DC line into positive sequence and zero sequence networks to calculate the harmonic current components of each sequence, and finally synthesize them into the final line harmonic current, but this method is only applicable to single-circuit DC lines with two poles, and cannot be further extended to DC lines with double circuits and four poles on the same tower

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  • Method for calculating DC side harmonic current of common-tower double-circuit DC transmission line
  • Method for calculating DC side harmonic current of common-tower double-circuit DC transmission line
  • Method for calculating DC side harmonic current of common-tower double-circuit DC transmission line

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Embodiment Construction

[0057] In order to describe the present invention more specifically, the method for calculating the harmonic current at the DC side of the double-circuit DC transmission line on the same tower in the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0058] Taking a single 12-pulse double-circuit DC transmission line on the same tower as an example, the rated voltage of the line system is ±500kV, and the single-circuit rated power is 3200MW.

[0059] Such as figure 1 As shown, a calculation method for the harmonic current of the DC side of the double-circuit DC transmission line on the same tower includes the following steps:

[0060] (1) Segment the double-circuit DC transmission line on the same tower.

[0061] In the actual calculation process, when the line is long and the harmonic frequency is high, The norm of the line may be greater than π, resulting in non-convergence of the series. In order ...

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Abstract

The invention discloses a method for calculating the DC side harmonic current of a common-tower double-circuit DC transmission line, which comprises the following steps of: (1) sectionalizing the common-tower double-circuit DC transmission line; (2) calculating admittance matrix of the whole section and each subsection of the common-tower double-circuit DC transmission line; and (3) calculating the DC side harmonic current of each subsection of the common-tower double-circuit DC transmission line. In the method, the DC line is sectionalized, and the series expansion of the admittance matrix of the line is optimized so as to ensure the series convergence of the admittance matrix, solve the problem of increasing of number of terms of the series in high frequency, greatly reduce a calculatedamount on the premise of ensuring the accuracy, and achieve relatively higher calculation accuracy, relatively higher applicability and practical engineering application value.

Description

technical field [0001] The invention belongs to the technical field of harmonic analysis and filter design of electric power systems, and in particular relates to a calculation method for harmonic current on the DC side of a double-circuit DC transmission line on the same tower. Background technique [0002] With the development of large AC and DC power grids in China, the AC and DC transmission system is becoming larger and larger, and the technology of DC transmission has also been paid more and more attention with the development of the power grid. At present, a number of high-voltage direct current transmission lines have been officially put into operation in my country, and many high-voltage direct current transmission lines are under construction, including double-circuit direct current transmission lines on the same tower. The calculation of harmonic currents on the DC side of DC transmission lines is the basis of DC filter design. The current existing method is to de...

Claims

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Application Information

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IPC IPC(8): H02J1/02
Inventor 徐政翁华徐韬
Owner ZHEJIANG UNIV
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