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Phase commutation failure analytical method based on direct-current transmission inverting side two-phase short-circuit fault

A short-circuit fault, DC transmission technology, applied in the field of power transmission and distribution, can solve problems such as line voltage zero-crossing offset

Inactive Publication Date: 2013-09-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +4
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, asymmetrical faults occur in the AC system, which not only makes U L drop, and will shift the zero-crossing point of the line voltage

Method used

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  • Phase commutation failure analytical method based on direct-current transmission inverting side two-phase short-circuit fault
  • Phase commutation failure analytical method based on direct-current transmission inverting side two-phase short-circuit fault
  • Phase commutation failure analytical method based on direct-current transmission inverting side two-phase short-circuit fault

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Embodiment Construction

[0133] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0134] A method for analyzing commutation failure based on a two-phase short-circuit fault on a DC inverter side is provided, and the method includes the following steps:

[0135] Step 1: Determine the boundary conditions of the phase component fault voltage and phase component fault current of the two-phase short-circuit fault (taking B and C as an example, the same below), and convert the phase component fault voltage into the sequence component fault voltage;

[0136] Step 2: Convert the sequence component fault voltage on the grid side of the converter transformer to the sequence component fault voltage on the valve side;

[0137] Step 3: Convert the sequence component fault voltage on the valve side to the phase component fault voltage on the valve side;

[0138] Step 4: Calculate the valve side line voltage, that is, the commutation voltage;

[0139] ...

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Abstract

The invention provides a phase commutation failure analytical method based on a direct-current transmission inverting side two-phase short-circuit fault. According to the method, valve line voltages, namely, commutation voltages, are analyzed when an inverting-side bus has a two-phase inter-phase short-circuit fault, a two phase and impedance short-circuit fault, a two-phase grounding short-circuit fault and a two phase and grounding impedance short-circuit fault, changes of amplitudes and phases of all line voltages, relative to normal working stations, of all kinds of faults are calculated in detail, turn-off angles of the phase a, the phase b and the phase c of a valve side of a converter transformer are calculated when the converter transformer is connected in different ways, and finally the affect of the two-phase short-circuit fault on phase commutation failure is obtained. Although whether a converter valve has phase commutation failure or not can not be accurately reflected by the turn-off angles worked out, the turn-off angles have certain guiding significance on phase commutation failure prevention.

Description

technical field [0001] The invention belongs to the technical field of power transmission and distribution, and in particular relates to a commutation failure analysis method based on a two-phase short-circuit fault on a direct current transmission inverter side. Background technique [0002] Since the 1950s, the line-commutated-converter high voltage direct current (LCC-HVDC) of the traditional power grid has gained rapid development worldwide due to its characteristics of large-capacity long-distance power transmission and fast controllable active power. development of. [0003] However, since LCC-HVDC uses ordinary thyristors without self-shutoff capability as commutation components, the LCC-HVDC system requires a certain strength of the AC system to achieve commutation, and the commutation voltage needs to be provided by the AC grid. When the power grid fails or the three-phase is seriously asymmetrical, the AC bus voltage will drop, the line voltage zero crossing point...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/40G01R31/02
Inventor 刘羽超李丹许韦华阳岳希赵成勇郭春义
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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