Low-cost DC circuit breaker suitable for overhead line DC power grid

A technology of DC circuit breaker and DC power grid, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of high cost, large turn-off delay, low voltage level, etc., to improve utilization, small turn-off delay, reduce The effect of turn-off delay

Inactive Publication Date: 2019-05-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of the current high-voltage DC circuit breaker, such as low voltage level, large turn-off delay, and high cost

Method used

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  • Low-cost DC circuit breaker suitable for overhead line DC power grid
  • Low-cost DC circuit breaker suitable for overhead line DC power grid
  • Low-cost DC circuit breaker suitable for overhead line DC power grid

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Embodiment Construction

[0017] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0018] Such as figure 1 As shown, the low-cost DC circuit breaker includes: an active short-circuit unit 1, an isolation unit 2, an energy absorption circuit 3, and a current-limiting reactor 4; wherein the active short-circuit unit is such as figure 2 As shown, the isolation unit as image 3 As shown, the energy absorption circuit using a half-controlled device (thyristor) is as follows Figure 4 As shown, the energy absorption circuit using uncontrolled devices (diodes) is as follows Figure 5 shown;

[0019] During normal operation, the full-control devices in the dotted box 5 of the active short-circuit unit are locked, and are controlled according to the control strategy of the converter station, which has the same function as the converter station; the fast mechani...

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PUM

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Abstract

The invention relates to a low-cost DC circuit breaker suitable for an overhead line DC power grid and belongs to the technical field of high-voltage and extra-high-voltage DC transmission. The low-cost DC circuit breaker comprises an active short-circuit unit, an isolation unit and an energy absorption circuit, wherein the active short-circuit unit is composed of a converter station with improvedstructure; the isolation unit comprises an ultrafast mechanical switch, a current transfer switch, and a metal oxide arrester; and the energy absorption circuit is composed of a thyristor and a metaloxide arrester. When the low-cost DC circuit breaker is in normal operation, the active short-circuit unit operates as a converter station, the isolation unit is connected in series in a line, one end of the energy absorption circuit is connected to the line, and the other end of the energy absorption circuit is connected to the negative pole of the line or the ground according to a single and double pole operation mode; The active short-circuit unit, the isolation unit, the energy absorption circuit achieve fault clearing and isolation through cooperative control.

Description

technical field [0001] The invention relates to a low-cost direct current circuit breaker suitable for an overhead line type direct current power grid, which belongs to the field of high voltage and extra high voltage direct current transmission. Background technique [0002] Due to many advantages, high-voltage and ultra-high-voltage direct current transmission have received more and more attention. In the future, multi-terminal direct current transmission and the direct current grid constructed from this will become a trend. However, the current of high-voltage direct current transmission has no zero crossing point and cannot be used like AC transmission. The use of zero-crossing point arc extinguishing brings great difficulties to the realization of DC circuit breakers. The current implementation methods are divided into the following types: based on superimposed oscillating current to generate current zero-crossing point, and then realize current breaking. The disadvantag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 许建中李帅俞永杰赵成勇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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