Direct current circuit breaker with opening current reducing effect and direct current fault treatment strategy thereof

A technology of DC circuit breaker and main circuit breaker, applied in the direction of emergency protection circuit device, circuit device, emergency protection circuit device for limiting overcurrent/overvoltage, etc., to achieve investment cost reduction, change speed and peak suppression, reduction The effect of breaking the current

Inactive Publication Date: 2018-03-09
ZHEJIANG UNIV +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, DC circuit breakers are still the fundamental technical bottleneck in the development of DC grids

Method used

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  • Direct current circuit breaker with opening current reducing effect and direct current fault treatment strategy thereof
  • Direct current circuit breaker with opening current reducing effect and direct current fault treatment strategy thereof
  • Direct current circuit breaker with opening current reducing effect and direct current fault treatment strategy thereof

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Embodiment Construction

[0021] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] like figure 1 As shown, the DC circuit breaker of the present invention that can reduce the breaking current includes a normal current flow branch, a current breaking branch, an energy consumption branch, a superconducting current limiter, a reactor and an isolating switch. The current branch is connected in parallel with the superconducting current limiter in series, and the whole after series is connected in parallel with the energy consumption branch; the connection point between the energy consumption branch and the superconducting current limiter is connected with one end of the isolation switch, and the other end of the isolation switch is connected with the One end of the reactor is connected, and the other end of the reactor is connected to...

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PUM

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Abstract

The invention discloses a direct current circuit breaker with opening current reducing effect and a direct current fault treatment strategy thereof. The direct current circuit breaker comprises a normal current flowing branch circuit, a current opening branch circuit, an energy consumption branch circuit, a super-conduction current limiter, a reactor and an isolation switch, wherein the normal current flowing branch circuit is formed by connecting a super-quick mechanical switch and a load transfer switch in series; the current opening branch circuit consists of a main circuit breaker; the energy consumption branch circuit consists of a lightning arrester; the load transfer switch is formed by connecting a plurality of submodules with bidirectional current flowing ability in series and parallel; the main circuit breaker is formed by connecting a plurality of enhanced semi-bridge submodules in series and parallel. The direct current circuit breaker has the advantages that the ascendingspeed and amplitude of the fault current are inhibited by the super-conduction current limiter, and then the opening current of the circuit breaker is reduced; the number of the submodules of the maincircuit breaker is greatly reduced, the engineering cost and operation loss are greatly reduced, and the strong reference meaning and use value in the engineering are realized.

Description

technical field [0001] The invention belongs to the technical field of power electronic systems, and in particular relates to a DC circuit breaker capable of reducing breaking current and a DC fault processing strategy thereof. Background technique [0002] There are two basic network construction methods for DC power grids: the first network construction method uses a modular multilevel converter (MMC) plus DC circuit breaker scheme based on half-bridge sub-modules. This network construction method is suitable for any number of terminals. The second network construction method uses MMC with DC fault self-clearing capability, such as the MMC based on the full bridge sub-module, but does not require DC circuit breakers. This network construction method is suitable for small-scale networks with less than 10 terminals DC grid. When the half-bridge sub-module MMC plus DC circuit breaker is used to construct the network, the converter station is usually required to continue to o...

Claims

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Application Information

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IPC IPC(8): H02H3/087H02H9/02
CPCH02H3/087H02H9/023Y02E40/60
Inventor 徐政唐英杰肖晃庆徐雨哲李继红陆翌
Owner ZHEJIANG UNIV
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