A method of using a diverter valve to realize the quick conversion of the metal return line of the earth return line

A fast conversion, earth return technology, applied in power transmission AC network, electrical components, emergency protection circuit devices, etc., can solve the problem of reducing system reliability and stability, poor ecological environment of surrounding power equipment, large ground current problems, to achieve the effect of reducing the probability of bipolar blocking, reducing the influence of surrounding equipment, and reducing the time of entering the ground

Active Publication Date: 2018-03-16
CSG EHV POWER TRANSMISSION +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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) Excessive ground current will cause corrosion to metal components and pipelines along the way
[0005] 3) Excessive ground current will affect the ecological environment near the ground electrode,
[0007] The existing earth-to-metal scheme needs to use an isolating switch for the metal return line to form a current path. Due to the slow action speed of the isolating switch, the closi

Method used

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  • A method of using a diverter valve to realize the quick conversion of the metal return line of the earth return line
  • A method of using a diverter valve to realize the quick conversion of the metal return line of the earth return line
  • A method of using a diverter valve to realize the quick conversion of the metal return line of the earth return line

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[0024] In the following, in conjunction with the accompanying drawings and specific implementation, a method for realizing the rapid conversion of the ground loop metal loop by using the converter valve in the high-voltage direct current transmission system proposed by the present invention will be described in detail.

[0025] This embodiment is directed to a single twelve-pulse high-voltage direct current transmission system. The direct current transmission system includes converter stations connected by DC lines at two ends and above the two ends. The DC side of each converter station includes a neutral bus switch HSNBS, metal Loop transfer circuit breaker MRTB, isolation switch for metal circuit, metal circuit switch MRS and converter valve BPS, etc.

[0026] In order to realize the rapid conversion from the ground loop to the metal loop, the DC transmission system of the present invention adopts the following steps:

[0027] S01: When a single-pole lockout occurs due to a fault ...

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Abstract

The invention relates to a method for achieving quick switching between a ground return wire and a metal return loop through employing a converter valve. Through the functional characteristics of a converter valve switching bypass pair and a characteristic that the switching-off time of the converter valve is short, the converter valve switching bypass pair is controlled firstly in an operation process of switching to the metal return wire from the ground return wire, thereby achieving the quick switching between the ground return wire and the metal return wire.

Description

technical field [0001] The invention belongs to the technical field of electric power and electronics, and in particular relates to a method for realizing rapid conversion of earth return line metal return line by using a bypass pair of a converter valve in a high-voltage 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 o...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02J3/36
CPCY02E60/60
Inventor 赵晓斌易智婷黄莹黎小林张怀晟燕京李凌飞李欢
Owner CSG EHV POWER TRANSMISSION
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