动态均压缓冲电路引起的晶闸管电流应力计算方法  

An Approach to Calculate Current Stress Caused by Dynamic Voltage-Sharing Snubber Circuit During Thyristor Turning-on Process

作　　者：仲崇山[1] 杨仁刚[1] 李成榕[2] 

机构地区：[1]中国农业大学信息与电气工程学院,北京市海淀区100083 [2]高电压与电磁兼容北京市重点实验室(华北电力大学),北京市昌平区102206

出　　处：《电网技术》2011年第3期124-128,共5页Power System Technology

基　　金：2009-2010年度中国农业大学研究生科研创新专项基金(15059203)的资助

摘　　要：为精确计算动态均压缓冲电路引起的晶闸管开通电流应力,分析理想开关模型的缺陷,通过正交实验研究晶闸管开通指数电压源模型的影响因素。应用该指数电压源模型,推导出开通电流应力的计算公式。并在仿真平台PSCAD/EMTDC中应用指数电压源模型进行了仿真分析,结果表明:理想开关模型不能客观、准确地反映该电流应力,应采用指数电压源模型进行计算;影响该指数模型中的关键参数的多种因素中,电压因素影响力最大。To calculate turning-on current stress of thyristors caused by dynamic voltage-sharing snubber circuit, the defects of ideal switch model is analyzed and by means of orthogonal experiments the factors impacting on exponential voltage-source model of thyristor are researched. Utilizing the exponential voltage-source model, the formula to calculate the turning-on current stress is derived, and the simulation of the exponential voltage-source model is performed by PSCAD/ EMTDC software. The research shows that ideal switch model of thyristor cannot reflect the current stress objectively and accurately, so the exponential voltage-source model of thyristor should be applied in the calculation; the key parameter in the exponential voltage-source model of thyristor is influenced by many factors, in which the voltage plays the biggest role.

关 键 词：晶闸管 动态均压 缓冲电路 电流应力 

分 类 号：TN34[电子电信—物理电子学]