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A hybrid high voltage DC circuit breaker based on thyristor full bridge module main circuit breaker switch type

A technology of circuit breakers and thyristors, applied in the field of hybrid high-voltage DC circuit breakers, can solve the problems of insufficient shut-off capacity and high cost of high-voltage DC circuit breakers, and achieve the effects of low cost, reduced usage, and large flow capacity

Active Publication Date: 2019-10-18
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the current high-voltage direct current circuit breaker's lack of shut-off capability and high cost

Method used

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  • A hybrid high voltage DC circuit breaker based on thyristor full bridge module main circuit breaker switch type
  • A hybrid high voltage DC circuit breaker based on thyristor full bridge module main circuit breaker switch type

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Embodiment Construction

[0012] 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.

[0013] figure 1 The dashed box 1 contains the fast mechanical switch S LCS and current transfer switch T LCS , the dotted box 2 contains a plurality of sub-modules, and each sub-module is composed of 8 thyristors, a capacitor and an energy absorption circuit;

[0014] During normal operation of this circuit, the fast mechanical switch S LCS and current transfer switch T LCS closed, the current flows through the branch shown in the dotted box 1, due to T LCS The number of IGBTs contained is low and the circuit breaker operates with low losses.

[0015] When a fault occurs and the current direction is from left to right, turn off the IGBT in the low-loss path, and at the same time turn on the thyristors T1 and T7 of each sub-module in the main circuit breaker power electr...

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Abstract

The invention relates to a hybrid high-voltage direct current circuit breaker based on a thyristor full-bridge module main circuit breaker switch and belongs to the technical field of high voltage andultra-high voltage direct current transmission. The high-voltage direct current circuit breaker is formed by a low-loss branch circuit, a cut-off switch and an energy absorption loop, wherein the low-loss branch circuit is formed by a fast mechanical switch and a small number of IGBTs, the main cut-off switch is formed by a thyristor and a capacitor, and the energy absorption loop is formed by alightning arrester. During normal operation, the current flows through a low-loss path, when a DC line or equipment fails, the IGBTs of the low-loss path are turned off, the current is transferred toa power electronic cut-off branch formed by the thyristor, when fast mechanical switch reaches a safety clearance, the current then is transferred to an energy absorption branch, under the action of the lightning arrester, system energy is quickly absorbed, and a failed line is removed.

Description

technical field [0001] The invention relates to a hybrid high-voltage direct-current circuit breaker based on a thyristor full-bridge module main break switch type, belonging to the field of high-voltage and ultra-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 resulting direct current grid will become a trend. However, the current of direct current transmission has no zero crossing point and cannot be used like alternating current transmission. Zero-crossing 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 disadvantage is that the tu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 郭春义李帅赵成勇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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