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A method and device for fast switching between earth return line and metal return line in a single twelve-pulse direct current transmission system

A direct current transmission system, single twelve-pulse technology, applied in the direction of power transmission AC network, etc., to achieve the effect of increasing stability, reducing the probability of bipolar blocking, and improving reliability

Active Publication Date: 2018-03-16
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problem of the need to realize the conversion of the earth return line to the metal return line when a single pole outage occurs in a direct current transmission project, and to provide a ground return line and a metal return line in a single twelve-pulse direct current transmission system. To improve the system reliability and stability of the DC transmission project, and reduce the impact of the ground current on the surrounding power equipment and the ecological environment

Method used

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  • A method and device for fast switching between earth return line and metal return line in a single twelve-pulse direct current transmission system
  • A method and device for fast switching between earth return line and metal return line in a single twelve-pulse direct current transmission system
  • A method and device for fast switching between earth return line and metal return line in a single twelve-pulse direct current transmission system

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Embodiment Construction

[0025] A method for fast switching between earth loops and metal loops in a direct current transmission system proposed by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] This embodiment is aimed at a single twelve-pulse high-voltage direct current transmission system. The direct current transmission system includes two ends connected by means of direct current lines and converter stations above two ends. The direct current side of each converter station includes a neutral bus switch HSNBS, a metal Return transfer circuit breaker MRTB, isolating switch for metal circuit, metal circuit switch MRS and bypass circuit breaker BPS, etc.

[0027] In order to realize the rapid conversion from the earth return line to the metal return line, the direct current transmission system of the present invention adopts the following steps:

[0028] S01, when single-pole blocking occurs due to failure or main...

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Abstract

The invention relates to a method and device for quickly switching a ground return wire and a metal return wire in a single-twelve-pulsation DC power transmission system. Through the characteristic that the switching-off time of a bypass circuit breaker is short, the bypass circuit breaker is switched on firstly and a metal return wire conversion circuit breaker is switched off secondly in a conversion process from the ground return wire to the metal return wire with the help of the characteristics of the bypass circuit breaker, thereby achieving the quickly switching between the ground return wire and the metal return wire.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a method for fast switching between a ground return line and a metal return line in a single twelve-pulse direct current transmission system. Background technique [0002] There are many modes of operation for the DC transmission system, including bipolar operation, single pole ground return line operation, and single pole metal return line operation. When one pole of DC is overhauled or fails, the other pole can continue to operate through the single-pole ground loop operation mode, which greatly improves the reliability of the DC transmission system. However, long-term geodetic operation has the following disadvantages: [0003] (1) The DC current flows into the transformer through the neutral point of the AC system transformer, causing the transformer to generate DC bias, which seriously affects the normal operation of the transformer; [0004] (2) Exce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 赵晓斌黎小林黄莹饶宏辛清明项阳卢毓欣
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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