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A one-way DC circuit breaker with igbt modules cascaded and its application method

A DC circuit breaker, module-level technology, applied in the direction of electrical components, pulse technology, electronic switches, etc., can solve the problems of unable to take into account the current breaking capacity, difficult to meet the application requirements of high-voltage and large-capacity DC systems, low breaking current, etc., to improve The effect of equipment technical economy, reducing consistency requirements, and improving breaking speed

Active Publication Date: 2022-08-05
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Abstract
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AI Technical Summary

Problems solved by technology

So far, the hybrid DC circuit breakers that have been successfully developed abroad are limited by the breaking capacity of a single fully-controlled device, and all of them have the problem of relatively low breaking current. However, the unidirectional DC circuit breaker formed based on the existing bidirectional topology scheme cannot It is difficult to meet the application requirements of high-voltage and large-capacity DC systems when the current breaking capacity is doubled

Method used

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  • A one-way DC circuit breaker with igbt modules cascaded and its application method
  • A one-way DC circuit breaker with igbt modules cascaded and its application method
  • A one-way DC circuit breaker with igbt modules cascaded and its application method

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Embodiment Construction

[0027] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0028] The following description and drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. The examples represent only possible variations. Unless explicitly required, individual components and functions are optional and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of embodiments of the invention includes the full scope of the claims, along with all available equivalents of the claims. These embodiments of the invention may be referred to herein by the term "invention," individually or collectively, for convenience only and not to automatically limit the application i...

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Abstract

The invention relates to a unidirectional direct current circuit breaker in which IGBT modules are cascaded and an application method thereof, comprising a parallel main current branch, a transfer current branch and an energy absorption branch; The control power electronic unit is connected in series; the energy absorption branch is formed by the arrester group; the transfer current branch is formed by the cascade connection of IGBT module units; When receiving the breaking command, the main current branch is fully controlled by the power electronic unit, and at the same time triggers the transfer current branch to cascade the new IGBT module; break the fast mechanical switch; commutate into the arrester. The DC circuit breaker of the invention can realize unidirectional, fast and arc-free breaking of DC current, and has strong overload capability, the breaking current can reach tens of kA, and can meet the application requirements of offshore wind power grid-connected and conventional multi-terminal DC power transmission systems.

Description

technical field [0001] The invention relates to a circuit breaker and an application method thereof, in particular to a unidirectional direct current circuit breaker with cascaded IGBT modules and an application method thereof. Background technique [0002] With the demonstration, application and planning and construction of multi-terminal flexible DC and DC grid technology based on voltage source converters (VSCs), high-voltage DC circuit breakers, as the key equipment to ensure the stable, safe and reliable operation of the system, have increasingly urgent application requirements. The hybrid DC circuit breaker technology of mechanical switch and fully-controlled power electronic switch combines the low loss characteristics of mechanical switches and the fast breaking characteristics of power electronic switches, and is currently the most effective technical way to apply DC breaking in high-voltage transmission systems. [0003] The existing hybrid DC circuit breaker has b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K17/567H03K17/081
Inventor 周万迪魏晓光张升刘远王成昊
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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