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Multi-terminal active resonant DC circuit breaker and control method thereof

A DC circuit breaker, a multi-terminal technology, is used in power transmission AC networks, emergency protection circuit devices, electrical components and other directions, which can solve problems such as large on-state loss, and achieve the goal of reducing construction costs, equipment volume and construction costs. Effect

Active Publication Date: 2021-01-19
FUZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing multi-terminal DC circuit breaker topology has problems such as large on-state loss

Method used

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  • Multi-terminal active resonant DC circuit breaker and control method thereof
  • Multi-terminal active resonant DC circuit breaker and control method thereof
  • Multi-terminal active resonant DC circuit breaker and control method thereof

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0027] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinatio...

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Abstract

The invention relates to a multi-terminal active resonant DC circuit breaker and a control method thereof. The circuit breaker comprises a converter station side circuit breaker, a line side circuit breaker and an ultra-fast mechanical switch. After a fault occurs, the converter station side circuit breaker and the line side circuit breaker form a resonance circuit, and the generated reverse resonance current flows through the ultra-fast mechanical switch, so that the electric arc of the ultra-fast mechanical switch is quickly extinguished; and after the fault line is isolated from a power grid, the line-side circuit breaker and the converter station-side circuit breaker carry out fault current isolation respectively. According to the direct-current circuit breaker structure, the number offull-control devices of the circuit breaker can be effectively reduced, and the control complexity is reduced; the fault isolation speed is high, the on-state loss is low, and a pre-charging circuitis not needed.

Description

technical field [0001] The invention relates to the field of circuit breakers, in particular to a multi-terminal active resonant DC circuit breaker and a control method thereof. Background technique [0002] Due to its many advantages such as large transmission capacity, high reliability, and simple structure, DC grid technology has attracted much attention. However, unlike the AC grid, the inductance in the DC grid cannot effectively suppress the fault current, and the current rise rate in the DC grid is much higher than that in the AC grid. Isolation of DC faults is more difficult since there is no natural current zero crossing. Therefore, the protection of DC faults has become a bottleneck restricting the development of DC power grids. [0003] At present, the isolation schemes for DC faults are mainly divided into two categories: using converter topology with fault self-clearing capability and installing DC circuit breakers. A converter with fault self-clearing capabi...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02J3/36
CPCH02H7/268H02J3/36Y02E60/60
Inventor 郭谋发吴洁萍洪翠高伟
Owner FUZHOU UNIVERSITY