Method for solving equivalent impedance frequency characteristic of HVDC transmission system converter

A technology of power transmission system and high-voltage direct current, which is applied in the field of solving the value impedance frequency characteristics, and can solve problems such as the occurrence of harmonic resonance.

Inactive Publication Date: 2010-03-03
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, when an asymmetrical fault occurs in the AC system, the change of the topology of the AC system and the asymmetric operation state of the converter will change the equivalent impedance fr

Method used

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  • Method for solving equivalent impedance frequency characteristic of HVDC transmission system converter
  • Method for solving equivalent impedance frequency characteristic of HVDC transmission system converter
  • Method for solving equivalent impedance frequency characteristic of HVDC transmission system converter

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Embodiment Construction

[0092] The present invention will be described in further detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0093] The structure of the converter in the HVDC transmission system of the present invention is as follows figure 1 shown.

[0094] 1. Use the known u a , u b and u c The 1st harmonic component, that is, the fundamental frequency component, such as:

[0095]

[0096]

[0097]

[0098] Calculate the corresponding line voltage 1st harmonic component, that is, the fundamental frequency component:

[0099]

[0100]

[0101]

[0102] 2. Put U ab(1) , U bc(1) and U ca(1) Convert to alpha component and beta components

[0103]

[0104] = 2 3 1 - 1 / 2 ...

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Abstract

The invention discloses a method for solving the equivalent impedance frequency characteristic of an HVDC transmission system converter under various operating conditions and failure conditions, whichcomprises the following steps: according to the fundamental component of voltage between phases of converting buses and the DC component of direct current, and a trigger angle instruction of a DC control system, calculating the actual trigger angle of each converting valve and the delay angle of flow of the converting valve in the converter, and the actual phase-change angle when two phases are converted; then calculating a three-phase voltage switching function and a three-phase current switching function; and by the subharmonic components of the three-phase voltage switching function and the three-phase current switching function, and the equivalent harmonic impedance of an AC network and a DC network, calculating the equivalent harmonic impedances at the AC side and the DC side of theconverter. The method can realize the calculation of the equivalent harmonic impedances at the AC side and the DC side of the converter under various AC operating conditions and failure conditions, reduce the calculation amount and meet the demand on precision in engineering application.

Description

technical field [0001] The invention relates to a method for solving the equivalent impedance frequency characteristics of a converter in a high-voltage direct current transmission system in the field of electric power systems, and in particular relates to a method for a high-voltage direct current transmission system under various normal operating conditions and asymmetric faults in the AC system. A method for solving the frequency characteristics of the equivalent impedance on the AC and DC sides of the converter. Background technique [0002] With the wide application of HVDC transmission system, the impact of the impedance-frequency characteristics of the converter on the AC system has attracted increasing attention. Studies at home and abroad have shown that with specific parameters, the equivalent harmonic impedance of the converter may cause harmonic resonance in the system, thereby amplifying the harmonics in the AC-DC system and leading to instability in the HVDC tr...

Claims

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Application Information

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IPC IPC(8): H02M7/04
Inventor 王钢李志铿李海锋黄敏
Owner SOUTH CHINA UNIV OF TECH
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