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Current commutation H-bridge type hybrid direct current fault current limiter topology

A technology of DC fault and current limiter, which is applied in the direction of emergency protection circuit devices, electrical components, circuit devices, etc. for limiting overcurrent/overvoltage, and can solve the problem of high failure rate on the DC side and half-bridge sub-modules that do not have DC Fault clearing ability and other issues to achieve the effect of suppressing fault current, good economy, and reducing demand

Inactive Publication Date: 2019-07-23
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Application Information

AI Technical Summary

Problems solved by technology

In the high-voltage long-distance high-power DC transmission project, the overhead line has obvious economic benefits, but its DC side has a high failure rate, and the half-bridge sub-module does not have the ability to clear DC faults

Method used

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  • Current commutation H-bridge type hybrid direct current fault current limiter topology
  • Current commutation H-bridge type hybrid direct current fault current limiter topology
  • Current commutation H-bridge type hybrid direct current fault current limiter topology

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Embodiment Construction

[0016] 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.

[0017] The topology of the current-commutated H-bridge hybrid DC fault current limiter is as follows: figure 1 As shown, it includes the on-state low-loss branch, the current commutation branch and four groups of H-bridge diodes, wherein the on-state low-loss branch includes ultra-fast mechanical switches and load transfer switches, and the current commutation branch contains three current Transfer branches.

[0018] In order to meet the bidirectional current limiting capability, four H-bridge diode groups are connected in parallel on both sides of the current commutation branch. Under normal circumstances, the line current flows from left to right. When a ground fault occurs on the right side of the current limiter, the fault current flows from left to right to the fault ...

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Abstract

The invention relates to a current commutation H-bridge type hybrid direct current fault current limiter topology, and belongs to the technical field of multi-terminal direct current and direct current power grids. During normal operation, load current flows through a low-loss branch circuit, and after a fault occurs, the current flows through a commutation branch circuit to realize a current limiting process. The commutation branch is composed of a thyristor, a commutation capacitor, a current-limiting inductor and four groups of H-bridge type diodes. The working principle, the control mode,the electrical stress and the engineering design of the current limiter are researched in detail, and simulation verification is carried out in a single-end converter station and a four-end direct-current power grid. Researches show that the current limiter can effectively inhibit current increase and has good economical efficiency.

Description

technical field [0001] The invention relates to a current-commutation H-bridge hybrid DC fault current limiter topology suitable for multi-terminal direct current and direct current power grids, belonging to the field of multi-terminal direct current and direct current power grids. Background technique [0002] With the depletion of fossil resources worldwide, the development of renewable energy is unstoppable, and the flexible DC power grid is also developing rapidly. Flexible DC transmission is a new generation of power transmission technology based on fully controlled power electronic devices. The DC grid based on flexible DC transmission can better realize the wide-area complementary transmission of large-scale renewable energy. It is one of the important directions for future grid development and transformation. one. The Zhangbei project and Wudongde project currently under construction in my country are landmark projects of DC transmission. The future DC grid project ...

Claims

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Application Information

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IPC IPC(8): H02H9/02
CPCH02H9/02
Inventor 许建中武董一俞永杰赵成勇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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