Pre-charged high speed direct current breaker and control method therefor

A DC circuit breaker and pre-charging technology, applied in circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, etc., can solve the problems of restricting engineering applications and difficulty in research and development, and achieve Reduce the fault current, realize the effect of quick cut off and short turn-off time

Active Publication Date: 2015-10-14
XUJI GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Then, the hybrid DC circuit breaker has very strict requirements on the disconnection speed of the mechanical switch. Generally, it needs to complete the disconnection within 3ms an

Method used

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  • Pre-charged high speed direct current breaker and control method therefor
  • Pre-charged high speed direct current breaker and control method therefor
  • Pre-charged high speed direct current breaker and control method therefor

Examples

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Embodiment Construction

[0024] Example of a DC circuit breaker

[0025] Such as figure 1 The pre-charging all-solid-state high-speed DC circuit breaker shown includes a parallel disconnection branch, a main electronic switch branch and a surge arrester branch. The main electronic switch branch is used to circulate the current during normal operation; the cut-off branch includes a series cut-off switch C, a capacitor and a current-limiting inductance L, and the two ends of the capacitor are connected to the charging power supply Uc through a charging switch; the main electronic switch branch includes At least one electronic switch unit, a plurality of electronic switch units are connected in series, and the electronic switch unit is composed of high-power switching devices. The lightning arrester is connected in parallel with the cut-off branch and the main electronic switch branch.

[0026] In this embodiment, there is no mechanical switch, and all solid-state switches are used, and the power elect...

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PUM

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Abstract

The invention relates to a pre-charged high speed direct current breaker and a control method therefor. The pre-charged high speed direct current breaker comprises a parallel cut-off branch and a main electronic switch branch, wherein the main electronic switch branch is used for circulating the current in normal operation; the cut-off branch comprises a serial cut-off switch and a capacitor, and the two ends of the capacitor are used for being connected with a charging power supply; the main electronic switch branch comprises at least one electronic switch unit, the multiple electronic switch units are connected in series, and each of the electronic switch units is composed of a high power switch apparatus. Both the cut-off switch and the main electronic switch branch are solid switches, so that the problem on use of a mechanical switch in the prior art can be avoided. The breaker simple in topological structure and control process and is convenient to realize in practical engineering.

Description

technical field [0001] The invention relates to a precharging high-speed direct current circuit breaker and a control method thereof. Background technique [0002] In recent years, with the continuous development of my country's economy and technology, the demand for energy is also increasing. In order to effectively solve the problem of uneven energy distribution in our country, DC transmission technology is currently becoming an effective means. In particular, the gradual maturity of flexible DC transmission technology has promoted the development of distributed new energy. Because the DC system has the characteristics of fast fault development, especially for the flexible DC transmission system based on IGBT devices, due to the existence of anti-parallel diodes, when the DC side fails, the short-circuit current cannot be quickly limited. Therefore, the study of DC circuit breakers is of great significance to the stability of DC transmission systems. [0003] At present...

Claims

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Application Information

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IPC IPC(8): H02H3/20H02H3/087H02H9/02H02H9/04
CPCH02H3/087H02H3/20
Inventor 吴金龙张军王先为
Owner XUJI GRP
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