Fault isolation and recovery method based on micro loss combined mechanical direct current breaker

A DC circuit breaker and fault isolation technology, which is applied in the field of electric power equipment, can solve the problems of large number of DC circuit breakers, high cost of DC circuit breakers, and increased construction costs of DC power grids, and achieve the effect of reducing construction costs and fast reclosing

Inactive Publication Date: 2018-04-20
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In other words, the number of DC circuit breakers that need to be configured in the DC power grid is huge, and the cost of DC circuit breakers is expensive, which in turn causes a substantial increase in the construction cost of the DC power grid

Method used

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  • Fault isolation and recovery method based on micro loss combined mechanical direct current breaker
  • Fault isolation and recovery method based on micro loss combined mechanical direct current breaker
  • Fault isolation and recovery method based on micro loss combined mechanical direct current breaker

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Embodiment Construction

[0022] The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are illustrated.

[0023] image 3 A structural schematic diagram of a micro-loss combined mechanical DC circuit breaker with reclosing function provided by the present invention is shown. Such as image 3 As shown, the micro-loss combined mechanical DC circuit breaker 300 with reclosing function includes: n terminals (Node_1, Node_2, Node_n), n flow branches (flow branch 1, flow branch 2, Flow branch n), 1 commutation branch; among them, flow branch 1, flow branch 2, flow branch n and commutation branch are connected in parallel; each flow branch is connected by a connection point (Midpoint_1 , Midpoint_2, Midpoint)n) as the boundary, which can be divided into upper bridge arm and lower bridge arm; connect.

[0024] In a specific embodiment of a micro-loss combined mechanical DC circuit breaker with reclosing fu...

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Abstract

The invention relates to a fault isolation and recovery method based on a micro loss combined mechanical direct current breaker. The adopted breaker comprises n terminals, n through-flow branches andone commutation branch; wherein the n through-flow branches are parallel with the one commutation branch, and each through-flow branch is divided into an upper bridge arm and a lower bridge arm bounded by a connecting point; each terminal is electrically connected with the connecting point of a through-flow branch; the upper bridge arm of each through-flow branch comprises one auxiliary mechanicalswitch, and the lower bridge arm comprises one isolating switch and one semiconductor switch module connected in series; and the commutation branch comprises one main mechanical switch, one high-voltage arm capacitor and one low-voltage arm capacitor connected in series. The fault isolation and recovery methods comprise the cut-off of the fault current, permanent fault quick reclosing and temporary fault quick reclosing.

Description

technical field [0001] The invention relates to the technical field of power equipment, in particular to a micro-loss combined mechanical DC circuit breaker with a reclosing function. Background technique [0002] In the DC power grid, DC circuit breakers are urgently needed to quickly isolate DC side faults, so as to ensure the reliable operation of normal converter stations and lines. [0003] At present, the mainstream technical routes of DC circuit breakers are divided into hybrid DC circuit breakers and mechanical DC circuit breakers. Among them, mechanical DC circuit breakers have the advantages of low cost and low operating loss, but they have the disadvantage of being unable to achieve fast reclosing. A typical mechanical DC circuit breaker topology is as figure 1 and figure 2 As shown, the mechanical DC circuit breaker includes a flow branch, a commutation branch and an energy absorption branch. The normal load current is conducted by the flow branch, and the ci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H3/06
CPCH02H3/066H02H7/268
Inventor 温伟杰李斌
Owner TIANJIN UNIV
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