摘要
为了保护固态断路器免受短路故障的瞬态冲击,设计有效和经济的缓冲器是相当重要的。传统的放电抑制型缓冲器由于其具有良好的电压钳位能力和较短的故障清除时间而被广泛使用,与此同时,金属氧化物变阻器由于其非线性伏安特性也可作为一个合适的解决方案。为了优化缓冲器设计,通过4个指标分析和比较这两种缓冲器的性能,包含峰值电压、峰值电流、故障清除时间及成本,充分考虑二者优势与不足的基础上,提出了基于电阻电容二极管(resistance capacitor diode, RCD)与金属氧化物变阻器(metal oxide varistors, MOV)混合型缓冲拓扑,该拓扑在合理的故障消除时间内,母线电压为200 V的情况下,缓冲峰值电压为264 V,相比于单独RCD电路缓冲电压峰值下降10.4%,单独MOV电路缓冲电压峰值下降30.8%。混合型缓冲电路能综合利用多种缓冲电路的优势,另外提出的4个指标,对缓冲器性能的评估给出了有价值的参考。
In order to protect the solid state circuit breaker from transient shocks,an efficient and economical design of the buffer is of paramount importance.Conventional resistance capacitor diode(RCD)buffers are widely used because of their excellent voltage clamping capability and short fault clearance time.At the same time,metal oxide varistors(MOV)can also be used as a suitable solution because of its non-linear U-I characteristics.In order to optimize the design of the buffer,four indicators,including,peak SSCB voltage,peak bus current,fault clearing time and cost,are selected to analyze the performance of the RCD buffer and MOV.Finally,based on the full consideration of the advantages and disadvantages of the two,a new buffer topology based on RCD and MOV is proposed.The voltage peak of new topology is 264 V,which decreases by 10.4%and 30.8%compared with RCD and MOV respectively,when the dc bus voltage is 200 V.A hybrid buffer topology can make use of the advantages of different buffer topologies.This paper provides reliable references for this kind of design thoughts.In addition,four indicators proposed in this paper have the reference value for the evaluation of functions of buffer circuits.
作者
苟锐锋
俞天毅
孙广星
刘文君
GOU Ruifeng;YU Tianyi;SUN Guangxing;LIU Wenjun(Xi’an XD Power Systems Co.,Ltd.,Xi’an710065,China;School of Electrical Engineering and Automation,Wuhan University,Wuhan430072,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2019年第8期2418-2424,共7页
High Voltage Engineering
