摘要
柔性直流输电(VSC-HVDC)更适合远距离大容量电能传输,能够有效提高大电网对分布式发电的并网消纳能力,直流断路器作为柔性直流输电的核心设备,能够快速切断故障电流、防止故障扩大。直流断路器主要分为机械式、固态、混合式3种类型,其中混合式直流断路器具有机械式直流断路器和固态直流断路器带载能力强、损耗小、电弧易熄灭、故障电流切断速度快等优点,逐渐成为直流断路器的主流发展方向。通过研究一种典型的混合式直流断路器,针对其存在的避雷器容量大、固态开关组不能零电压开通、故障电流切除时间长等缺点,提出了一种双臂架构混合型直流断路器,并通过仿真将2种断路器做了对比,仿真对比结果证明所提出的双臂结构混合型直流断路器更加经济、切除故障电流速度快、固态开关组可以实现零电压开通。
VSC-HVDC transmission is more suitable for long-distance and large-capacity power transmission, effectively improving distributed generation accommodation capacity of power grid. DC circuit breaker, as a piece of core equipment for VSC-HVDC, can quickly cut off fault current and prevent fault expansion. DC circuit breakers are mainly divided into three types, i.e. mechanical, solid, and hybrid. Among them the hybrid DC circuit breaker has the advantages of strong carrying capacity, small loss, easy arc extinguishing and fast fault current cutting-off, and gradually becomes the main development direction of DC circuit breaker. In this paper, a typical hybrid DC circuit breaker is studied. In view of its disadvantages, such as large capacity of arrester, non-zero voltage switching of solid state switch group and long fault current cutting-off time, a double-bridge hybrid DC circuit breaker is proposed. The two kinds of circuit breakers are compared with simulation, proving that the proposed double-bridge hybrid DC circuit breaker is more economical with shorter fault current cutting-off time, and the solid-state switch group can realize zero voltage switching(ZVS).
作者
单任仲
王世友
刘闯
蔡国伟
姜朋
SHAN Renzhong;WANG Shiyou;LIU Chuang;CAI Guowei;JIANG Peng(School of Electrical Engineering,Northeast Electric Power University,Jilin 132012,Jilin Province,China;State Grid Zibo Power Supply Corporation,Zibo 255000,Shandong Province,China)
出处
《电网技术》
EI
CSCD
北大核心
2019年第6期2065-2071,共7页
Power System Technology
