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Hybrid high-voltage direct current circuit breaker based on constant-pass type SIC device and control method thereof

A high-voltage direct current, normally-on technology, which is applied to emergency protection circuit devices, electrical components, and circuit devices for limiting overcurrent/overvoltage, can solve the technical difficulty of cutting off line faults in DC transmission systems, and achieve Low cost, improved motion speed, and reduced cost

Active Publication Date: 2019-11-08
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above problems, the object of the present invention is to provide a DC power transmission system based on normally-connected devices with simple structure, low cost and high reliability, which can solve the technical difficulty of cutting off line faults, multi-cascade power device drive and series voltage equalization. Hybrid high-voltage DC circuit breaker of type SIC device and its control method

Method used

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  • Hybrid high-voltage direct current circuit breaker based on constant-pass type SIC device and control method thereof
  • Hybrid high-voltage direct current circuit breaker based on constant-pass type SIC device and control method thereof
  • Hybrid high-voltage direct current circuit breaker based on constant-pass type SIC device and control method thereof

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. The present invention provides a hybrid high-voltage DC circuit breaker based on a normally-on SIC device, such as figure 1 As shown, including flow branch, transfer branch, energy absorption branch and control system. The flow branch includes a fast mechanical switch and an auxiliary SIC power switch; the transfer branch includes a normally-on SIC power device high-voltage switch; the energy absorption branch includes a metal oxide varistor (MOV). The two ends of the flow branch, the two ends of the transfer branch and the two ends of the energy absorption branch are connected in parallel with each other.

[0025] One end of the fast mechanical switch is connected to one end of the flow branch, the other end of the fast mechanical switch is connected to one end of the auxiliary SIC power switch, and the other end of the auxiliary SIC ...

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Abstract

The invention discloses a hybrid high-voltage direct current circuit breaker based on a constant-pass type SIC device and a control method thereof and belongs to the electrical equipment and electricengineering technology field. The circuit breaker comprises a through-flow branch, a transfer branch, an energy absorption branch, and a control system. The through-flow branch includes a fast mechanical switch and an auxiliary SIC fully-controlled power switch tube. The transfer branch includes a constant-pass type SIC power device high-voltage switch. The energy absorption branch includes a metal oxide variable resistor (MOV). The control system includes a direct current detection module, a driving circuit module, and a control circuit module. In the invention, problems of a large direct current transmission system cut-off line fault technology difficulty, multi-cascade power device driving and series voltage sharing can be solved, the structure is simple, cost is low and reliability ishigh.

Description

technical field [0001] The invention relates to the technical field of electrical equipment and electrical engineering, in particular to a hybrid high-voltage direct current circuit breaker based on a normally-on SIC device and a control method thereof. Background technique [0002] High-voltage DC circuit breakers are key equipment for cutting off line faults and are crucial to maintaining the safe operation of DC power grids. Due to the low line impedance of the DC transmission system, when a short-circuit fault occurs on the line, the fault current rises quickly and has a high amplitude. The DC circuit breaker is required to respond quickly and have a large breaking current amplitude. In addition, compared with the AC transmission system, the DC transmission system is unipolar, and the current has no zero-crossing point, so the breaking principle of the AC circuit breaker cannot be applied. It is necessary to manually create the zero-crossing point to realize the current ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/087H02H9/02
CPCH02H3/087H02H9/025
Inventor 杨平张飞虎孔倩孙义杰吴松荣
Owner SOUTHWEST JIAOTONG UNIV
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