摘要
随着柔性直流输电技术的不断成熟,直流输电变得越发普及,而高压直流断路器(DC circuit breaker,DCCB)及其内部的金属氧化物避雷器作为直流电网的关键部分,其重要性不言而喻。针对现有DCCB,投入的数量多导致成本过高、避雷器吸收能量过多和关断时间过长等问题,因此提出了一种新型多端口高压直流断路器拓扑(multiport DC circuit breaker,MP-DCCB)。通过改进DCCB拓扑结构,对新型MP-DCCB的限流过程及断路过程进行理论分析,并给出了器件相关参数及选取依据,最后用PSCAD软件搭建相应的仿真模型。仿真出来的结果与已有的DCCB方案相比,新型MP-DCCB具有抑制故障电流的大小、减少避雷器的消耗能量、缩短避雷器的关断时间和关断电流等优点。因此该新型MP-DCCB具有良好的可靠性与经济性,仿真结果验证了所提方案拓扑可适用于当前直流电网。
With the development of flexible DC transmission technology,DC transmission is becoming more and more popular.DC circuit breaker(DCCB)and its internal metal oxide arresters are the key parts of DC grid.A multi port DC circuit breaker(MP-DCCB)with reduced arrester capacity is proposed in view of the problems,such as high cost,too much energy absorbed by arrester and too long turn off time of DCCB and arrester.By improving the DCCB topology,the current limiting process and the open circuit process of the new MP-DCCB are theoretically analyzed,and the relevant parameters and the selection basis of the device are given.Finally,the corresponding simulation model is built with PSCAD software.Compared with the existing DCCB scheme,the simulation results show that the new MP-DCCB has the advantages of suppressing the magnitude of the fault current,reducing the energy consumption of the arrester,shortening the closing time and closing current of the arrester.Therefore,the new MP-DCCB has good reliability and economy,and the simulation results verify that the proposed topology can be applied to the current DC power grid.
作者
孙瑞
章宝歌
张振
荣耀
SUN Rui;ZHANG Baoge;ZHANG Zhen;RONG Yao(School of Automation&Electrical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《电瓷避雷器》
CAS
北大核心
2023年第4期27-37,共11页
Insulators and Surge Arresters
基金
国家自然科学基金项目(编号:61741508)
国家重点研发计划(编号:2017YFB1201003-20)。
关键词
直流电网
多端口高压直流断路器
限流支路
接地支路
短路故障
避雷器
DC power grid
multi port HVDC circuit breaker
current limiting branch
grounding branch
short circuit fault
lightning arrester
