Branch assembly for DC circuit breaker, DC circuit breaker

Abstract

The invention relates to a branch assembly for a DC circuit breaker and a DC circuit breaker. The branch assembly includes a switch sub-module, the switch sub-module includes at least two switching power modules connected in parallel, the switching power module includes an H-bridge module, and the H-bridge module Including the first and second bridge arms connected in parallel, the first and second bridge arms are composed of two non-control device valve groups connected in series in the same direction; the series connection point of the two non-control device valve groups of the first bridge arm is the switching power module The input / output end of the second bridge arm, the series point of the two uncontrolled device valve groups is the output / input end of the switching power module; the switching power module also includes a capacitor valve group and two fully controlled devices connected in parallel in the same direction The valve group, the capacitor valve group and the full control device valve group are connected in parallel with the first bridge arm and the second bridge arm. The invention effectively improves the current breaking capacity of the branch circuit assembly for the DC circuit breaker by connecting two switching power modules in parallel and setting two parallel-connected full-control device valve groups in each switching power module.

Description

technical field [0001] The invention relates to a branch assembly for a DC circuit breaker and a DC circuit breaker, belonging to the technical field of high-voltage DC circuit breakers. Background technique [0002] At present, there are three main 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. With the continuous improvement of controllable power device manufacturing technology, hybrid DC circuit breakers have developed rapidly. [0003] Among them, the topology structure widely used in the hybrid DC circuit breaker is: the parallel connection of the flow main branch and the transfer branch. The main flow branch is formed by a series of auxiliary converter modules and mechanical switches, and the transfer branch is formed by a large number of tran...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a branch assembly for a DC circuit breaker and a DC circuit breaker, which are used to solve the problem of poor current breaking capacity of the converter module in the DC circuit breaker, and further solve the problem of the topology of the converter module for a specific DC circuit breaker. structure, the problem that the existing equipment structure layout is no longer applicable

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