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Opening control method for high-voltage direct-current circuit breaker

A DC circuit breaker, high-voltage DC technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problem that the opening speed and opening accuracy cannot be balanced, and achieve the effect of increasing the opening speed and ensuring safety

Active Publication Date: 2017-03-22
PINGGAO GRP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a high-voltage DC circuit breaker opening control method, which is used to solve the technical problem that the opening speed and opening accuracy cannot be taken into account during the opening process of the DC circuit breaker

Method used

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  • Opening control method for high-voltage direct-current circuit breaker
  • Opening control method for high-voltage direct-current circuit breaker
  • Opening control method for high-voltage direct-current circuit breaker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Such as figure 1 As shown, the high-voltage DC circuit breaker includes a flow branch, a break branch and an energy consumption branch connected in parallel. Among them, the flow-through branch is composed of a group of mechanical switches K and a group of auxiliary commutation modules SMC connected in series, the cut-off branch is composed of a group of cut-off modules SMB connected in series, and the energy-dissipating branch is composed of a lightning arrester Z to consume the fault current. The specific structures of the auxiliary commutation module SMC and the current breaking module SMB can adopt the common H-bridge structure, half-bridge structure or other modules that can be used for current flow or current interruption.

[0024] Under normal operating conditions, all mechanical switches in the flow branch of the high-voltage branch circuit breaker are closed, all auxiliary converter modules are unlocked, and direct current flows through all mechanical switches ...

Embodiment 2

[0033] Such as figure 2 As shown, the high-voltage DC circuit breaker includes a flow branch, a break branch and an energy consumption branch connected in parallel. Among them, the flow-through branch is composed of the first group of mechanical switches K1 and the first group of mechanical switches K2 connected in parallel and connected in series with a group of auxiliary commutation modules SMC, the cut-off branch is composed of a group of cut-off modules SMB in series, and the energy-consuming branch is composed of The arrester Z is composed to consume the fault current. The specific structures of the auxiliary commutation module SMC and the current breaking module SMB can adopt the common H-bridge structure, half-bridge structure or other modules that can be used for current flow or current interruption.

[0034] Under normal operating conditions, the first group of mechanical switches K1 in the flow branch of the high-voltage branch circuit breaker are closed, all auxil...

Embodiment 3

[0046] Such as image 3 As shown, different from the DC circuit breaker in Embodiment 2, the flow branch of the high-voltage DC circuit breaker in this embodiment is composed of two branches connected in parallel, wherein the first branch is composed of the first group of mechanical switches K1 and The first group of auxiliary commutation modules SMC1 is formed in series, and the second branch is composed of the second group of mechanical switches K2 and the second group of auxiliary commutation modules SMC2 in series.

[0047] Under normal operation, the first group of mechanical switches K1 in the flow branch of the high-voltage branch circuit breaker is closed, the first group of auxiliary commutation module SMC1 is unlocked, and the DC current flows through the first group of mechanical switches K1 in the flow branch and the first group of auxiliary converter modules SMC1. Of course, as an alternative, the second group of mechanical switches K2 may also be selected to be ...

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Abstract

The invention relates to an opening control method for a high-voltage direct-current circuit breaker. The opening control method comprises the steps of switching on a cut-off branch and switching off a through-flow branch when a fault current is detected; determining whether an opening instruction from a control protection system is received or not; if the opening instruction is received, switching off the cut-off branch to complete opening of the direct-current circuit breaker; and if the opening instruction is not received by the direct-current circuit breaker, re-switching-on the through-flow branch and switching off the cut-off branch to prohibit opening of the direct-current circuit breaker. According to the method, the opening operation of the direct-current circuit breaker is performed in two steps; the opening process or the re-opening operation is completed according to whether the opening instruction from the control protection system is received or not; and therefore, the opening precision is ensured while the opening speed of the direct-current circuit breaker is remarkably improved.

Description

technical field [0001] The invention relates to an opening control method of a high-voltage direct current circuit breaker, which belongs to the technical field of direct current transmission. Background technique [0002] At present, there are mainly three types of technical solutions for DC circuit breakers, namely traditional mechanical DC circuit breakers based on conventional switches, solid-state DC circuit breakers based on pure power electronic devices, and hybrid DC circuit breakers based on the combination of the two. Among them, the breaking time of the traditional mechanical DC circuit breaker is relatively long, and the loss of the solid-state DC circuit breaker is relatively large. With the development of high-voltage and large-capacity semiconductor devices, the hybrid DC circuit breaker technology that combines the characteristics of conventional mechanical switches and power electronic devices has developed rapidly. [0003] The structure of the existing DC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/268
Inventor 康成程铁汉吴军辉毛志宽高树同魏义涛
Owner PINGGAO GRP
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