Master-slave cooperative control method and control system for DC circuit breaker

Abstract

The invention provides a master-slave synergic control method and control system of a DC circuit breaker. The method comprises the steps of switching off a mechanical branch switch and recording faultgeneration time when a fault occurs and a breaking signal is given out from a slave control signal; breaking the mechanical switch when the fault generation time is smaller than a time threshold anda current is detected to be 0; and receiving a master control signal when the fault generation time is not smaller than the time threshold and that the mechanical switch is switched off to reach voltage resistance is detected, and judging whether a main branch switch of the DC circuit breaker is switched off or not according to the received master control signal, wherein the master control signalis a system detection signal, and the slave control signal is a changing signal of a DC voltage value in the DC circuit breaker. With the technical scheme provided by the invention, the system fault is judged by combining the accuracy of the system detection signal and the rapidness of slave control in the DC circuit breaker, rapid response speed and accurate judgment are achieved, and misoperation of the DC circuit breaker can be effectively prevented.

Description

Technical field [0001] The invention relates to the control field of a DC circuit breaker, in particular to a master-slave coordinated control method and a control system of a DC circuit breaker. Background technique [0002] DC circuit breakers are one of the key equipment in the DC transmission system. Currently, they can be divided into three types: mechanical DC circuit breakers, all solid-state DC circuit breakers, and hybrid DC circuit breakers. Among them, the hybrid DC circuit breaker combines mechanical switches and solid-state power electronic devices, combining the advantages of the former two, and has a good research prospect. However, the rapid development of DC-side faults and the difficulty of switching off the DC fault current quickly is still one of the main problems faced by hybrid DC circuit breakers, and is also the focus of current research. [0003] In the prior art, a cascaded full-bridge DC circuit breaker based on the series connection of full-bridge modul...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem in the prior art that the DC circuit breaker mainly receives the detection signal from the system to complete the disconnection, resulting in a long fault response time and cannot be disconnected in time, the present invention provides a DC circuit breaker master-slave cooperative control method and control system

Images