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Cascadable solid-state DC fault current limiter, cascade structure and working method

A DC fault and current limiter technology, applied in emergency protection circuit devices, electrical components, circuit devices, etc. used to limit overcurrent/overvoltage, can solve the problem of expensive superconducting materials, reduced current limiting effect, and recovery from superconducting materials. Difficulty in guiding the state, etc.

Active Publication Date: 2019-09-06
HARBIN INST OF TECH
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Problems solved by technology

At present, the active DC fault current limiter can be divided into the following types: 1. Superconducting DC fault current limiter, this kind of current limiter has simple structure, convenient control and fast response, but the superconducting material is expensive, and in It is difficult to restore the superconducting state after quenching, which is also the main factor restricting the development of superconducting current limiters
2. Solid-state DC fault current limiter, this cur

Method used

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  • Cascadable solid-state DC fault current limiter, cascade structure and working method
  • Cascadable solid-state DC fault current limiter, cascade structure and working method
  • Cascadable solid-state DC fault current limiter, cascade structure and working method

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Embodiment Construction

[0043] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0044] combine figure 1 , the present invention proposes a cascadable solid-state DC fault current limiter, the current limiter includes a thyristor T 1 , Thyristor T 2 , Thyristor T 3 , Thyristor T 4 , Thyristor T 5 , Thyristor T 6 , Current limiting reactor L 1 , Current limiting reactor L 2 , capacitance C 1 , capacitance C 2 , Diode D 1 and diode D 2 ; The thyristor T 1 The anode and line inductance L 0 Connected at one end of the ...

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Abstract

The present invention provides a cascadable solid-state DC fault current limiter, a cascade structure and a working method. The solid-state DC current limiter of the invention can turn off a corresponding thyristor through a pre-charged capacitor, thereby a current limiting reactor is connected in series with the fault circuit after the short circuit fault occurs in a DC transmission and distribution system so as to limit the rising speed of the fault current. At the same time, the solid-state DC fault current limiter has the ability of cascade and expansion and can deal with the short circuitcurrent with different magnitudes by using a cascade limiting method, namely the higher the fault current, the more the current limiting reactors put into use.

Description

technical field [0001] The invention belongs to the technical field of fault current limiters, in particular to a cascadable solid-state DC fault current limiter, a cascade structure and a working method. Background technique [0002] With the continuous development of power electronics technology, DC transmission and distribution technology is developing rapidly. Compared with the AC power transmission and distribution system, the DC power transmission and distribution system has the advantages of good power quality, large power supply capacity, small line loss, and no need for power compensation. However, the DC power transmission and distribution system has higher protection requirements than the traditional AC power transmission and distribution system. After a short-circuit fault occurs in the DC power transmission and distribution system, the short-circuit current rises rapidly and is difficult to deal with, and the general DC circuit breaker does not have AC power tra...

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Application Information

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IPC IPC(8): H02H9/02
CPCH02H9/02
Inventor 王盼宝郝鑫孙红梅黄蕊任鹏王卫徐殿国
Owner HARBIN INST OF TECH
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