高电压技术2018，Vol.44Issue(2)：347-357,11.DOI:10.13336/j.1003-6520.hve.20180131002
直流断路器的基本原理和实现方法研究
Study on Basic Principle and Its Realization Methods for DC Circuit Breakers
摘要
Abstract
DC circuit breakers are the key elements of DC grids.We studied the basic principle and its realization methods for DC circuit breakers.Firstly,the two basic ways of breaking DC current were discussed.Secondly,the realization methods based on the way by the series inserted infinite resistor were analyzed.Thirdly,according to the way by the series inserted capacitor,three DC circuit breaker structures were proposed.Finally,the economy of four DC circuit breaker structures were compared.The following conclusions can be drawn.(1) There are two basic ways of breaking DC current,namely the way by the series inserted infinite resistor and the way by the series inserted capacitor.For the former one,the maximum fault current appears at the moment of inserting the resistor.For the latter one,the maximum fault current appears after the capacitor is inserted for some time.(2) DC circuit breakers that have been used in practical engineering are based on the way by the series inserted infinite resistor.(3) The converters with DC fault handling capability are based on the way by the series inserted capacitor.(4) Three DC circuit breakers based on the way by the series inserted capacitor are proposed,including the single branch DC circuit breaker with series inserted capacitor,the double branch DC circuit breaker with series inserted capacitor,and the triple branch DC circuit breaker with series inserted capacitor.All these three DC circuit breakers can be employed to deal with DC faults effectively,but the single branch DC circuit breaker with series inserted capacitor has the shortest fault handling time.(5) Among the DC circuit breakers compared in this paper,the triple branch DC circuit breaker with a normal current path,a main transfer branch and a lumped series inserted capacitor,has the lowest cost.The results can provide references for the research and development of DC circuit breakers.关键词
直流断路器/断流原理/串入无穷大电阻/串入电容/增强型半桥子模块/精简型半桥子模块Key words
DC circuit breaker/current breaking principle/series inserted infinite resistor/series inserted capacitor/enhanced half bridge sub-module/reduced half bridge sub-module引用本文复制引用
徐政,肖晃庆,徐雨哲..直流断路器的基本原理和实现方法研究[J].高电压技术,2018,44(2):347-357,11.基金项目
国家电网公司科技项目(5211011600R4).Project supported by Science and Technology Project of SGCC (5211011600R4). （5211011600R4）
