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Active oscillation type direct-current circuit breaker and application method thereof

A technology of DC circuit breaker and application method, which is applied in the direction of DC network circuit devices, circuits, circuit devices, etc., and can solve problems such as unfavorable promotion and application of high-voltage direct current transmission systems, high risk of restarting when small current is interrupted, and cost of system oscillation equipment , to achieve the effect of shortening the oscillation time, reducing the overall breaking time, and low current loss

Pending Publication Date: 2021-09-21
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the problems of the DC circuit breaker in the prior art, such as the high risk of small current interruption and restrike, significant oscillation with the system, and relatively high equipment cost, which are not conducive to its application in the high-voltage direct current transmission system. Defects in large-scale popularization and application, thereby providing a DC circuit breaker and its application method

Method used

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  • Active oscillation type direct-current circuit breaker and application method thereof
  • Active oscillation type direct-current circuit breaker and application method thereof
  • Active oscillation type direct-current circuit breaker and application method thereof

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Embodiment 1

[0029] The embodiment of the present invention provides an active oscillating DC circuit breaker, which is applied to occasions where the DC circuit breaker is reliably shut down, such as Figure 1(a) ~ Figure 1(c) As shown, it includes: flow branch 1, oscillation branch 2 and energy consumption branch 3.

[0030] Such as Figure 1(a) ~ Figure 1(b) As shown, the flow branch 1 of the embodiment of the present invention is connected in parallel with the oscillation branch 2, and the flow branch 1 includes at least one high-speed mechanical switch.

[0031] Such as Figure 1(a) ~ Figure 1(c) As shown, the oscillating branch 2 of the embodiment of the present invention includes: an LC oscillating circuit and a controlled power supply unit 21, wherein the LC oscillating circuit is composed of an oscillating capacitor C 1 , The oscillating inductance L is formed, and the oscillating capacitor C 1 , the oscillating inductance L and the controlled power supply unit are connected in s...

Embodiment 2

[0040] An embodiment of the present invention provides an application method of an active oscillating DC circuit breaker. Based on the active oscillating DC circuit breaker of Embodiment 1, the application method includes: when the DC circuit breaker receives a breaking order, control the oscillating branch and the The operating state of the internal components of the flow branch, the oscillation branch produces an oscillating current that is equal in magnitude to the short-circuit current and opposite in direction.

[0041] Specifically, the active oscillating DC circuit breaker of the embodiment of the present invention is applied to a DC system, such as Figure 1(a) ~ Figure 1(c) As shown, when there is no fault in the DC system, the flow branch 1 is in the conduction state, the oscillation branch 2 (specifically, the controlled power supply unit 21 inside it) remains in the locked state, and the flow branch 1 realizes the DC load current When the DC circuit breaker receives...

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Abstract

The invention discloses an active oscillation type direct-current circuit breaker and an application method thereof. The direct-current circuit breaker comprises a through-flow branch circuit, an oscillation branch circuit and an energy consumption branch circuit, wherein the through-flow branch circuit is connected with the oscillation branch circuit in parallel, the energy consumption branch circuit is connected with the through-flow branch circuit in parallel, or the energy consumption branch circuit is connected with internal elements of the oscillation branch circuit, and when a direct-current system does not fail, the oscillation branch circuit is locked, and the through-flow branch circuit conducts a direct-current load current. When a breaking command is received, the operation states of internal elements of the oscillation branch circuit and the through-flow branch circuit are controlled, so that the oscillation branch circuit generates oscillation current of which the amplitude is rapidly increased until the oscillation current and the short-circuit current are equal in amplitude and opposite in direction, and the through-flow branch circuit is reliably switched off; therefore, the problems of large reignition risk, obvious system oscillation, relatively high equipment cost and the like during small-current switching-off are solved, and large-scale popularization and application of the direct-current circuit breaker in a direct-current power transmission and distribution system can be realized.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an active oscillating DC circuit breaker and an application method thereof. Background technique [0002] Faults in DC transmission and distribution systems develop rapidly and the current increases rapidly. Reliable fault isolation is the key to ensure its safe and stable operation. High-tech and economical DC circuit breakers are the core equipment supporting the development and application of DC power transmission and distribution systems. At present, there are mainly two types of medium and high-voltage DC circuit breakers that are widely used. One is the mechanical DC circuit breaker, which realizes the arc-off and shutdown of the mechanical switch through a single injection of reverse current, with low loss, but it has long reclosing time, The risk of re-ignition of the mechanical switch for small current breaking, and the breaking process is easy to form oscilla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H3/087H02H3/05H02J1/00H01H9/54
CPCH02H7/268H02H3/087H02H3/05H02J1/00H01H9/54
Inventor 周万迪魏晓光张升刘远贺之渊李弸智
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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