Thyristor-based passive hybrid direct current circuit breaker and application method therefor

Abstract

The invention relates to a thyristor-based passive hybrid direct current circuit breaker and an application method therefor. The passive hybrid direct current circuit breaker comprises a main through-flow branch, a first transfer current branch, a second transfer branch and an energy absorption branch which are connected in parallel, wherein the main through-flow branch consists of a rapid mechanical switch K and a small amount of fully-controlled power electronic units which are connected in series; the first transfer current branch consists of two groups of thyristor valves T1 which are connected in an anti-parallel manner; the second transfer current branch consists of a capacitor C, an inductor L and a group of thyristor valves T2 which are connected in an anti-parallel manner; the inductor and a thyristor valve connecting line are connected with one end of a resistor while the other end of the resistor R is grounded; and the energy absorption branch consists of series-wound arrester groups. By adoption of the technical scheme provided by the invention, the problem that the current breaking capability of the existing hybrid type direct current circuit breaker is limited by the turn-off capability of a single fully-controlled device and the problem of relatively low current breaking capability are solved.

Description

technical field [0001] The invention relates to a DC circuit breaker and an application method thereof, in particular to a thyristor-based passive hybrid DC circuit breaker and an application method thereof. Background technique [0002] With the demonstration application and planning construction of multi-terminal flexible DC and DC grid technology based on voltage source converter (VSC), the application demand of high-voltage DC circuit breaker, as the key equipment to ensure the stable, safe and reliable operation of DC system, is becoming increasingly urgent. Mixed use of mechanical switches and fully-controlled power electronic switch DC circuit breaker technology combines the low loss characteristics of mechanical switches and the fast breaking characteristics of power electronic switches. It is currently the most effective technical approach for DC breaking in high-voltage transmission systems. So far, the hybrid DC circuit breakers that have been successfully develop...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a thyristor-based passive hybrid DC circuit breaker and its application method, which solves the problem that the breaking current capacity of the existing hybrid DC circuit breaker is limited by a single fully-controlled device The problem of small breaking capacity and breaking current capacity

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