摘要
高压直流输电(HVDC)近年来在我国的电力系统中所占比重呈现显著增长,针对HVDC换流阀的相关研究成为其中的重点。晶闸管的结温及其冷却变化影响其工作特性及其使用寿命,然而结温和冷却温度由于模型复杂难以直接测定。因此本文提出通过改良和完善考尔(Cauer)网络模型,将晶闸管自身的热阻抗特性和冷却系统结合成为一个等效电路,分别模拟了晶闸管内的铜、钼、钨、硅等热阻抗体特性以及常用的水冷套阻抗。此外,增加了散热器的暂态阻抗特性分析,补充了晶闸管在暂态过程中散热的情况。计算结果显示新的模型能够更好地反应晶闸管真实的阻抗特性,验证了新模型的精确性。
HVDC is developing remarkably in our country in recent years and the research on HVDC has also becomes a main point. The changes of temperature and cooling situation have great influences on performance and working life of HVDC valve,however,the accurate measurement is restricted by the complexity of the module. Under this circumstance this essay comes up with a modified equivalent circuit model based on Cauer model with combining thermal resistance of valve and radiator. The improved model analyzes the thermal impendence of Cu,Mo,W,Si and the normal radiator. With adding time-varying impendence of the radiator,the calculation of the new model shows that the result is close to actual value.
出处
《电工电能新技术》
CSCD
北大核心
2016年第1期36-41,共6页
Advanced Technology of Electrical Engineering and Energy
基金
国家自然科学基金资助项目(51477186)
关键词
高压直流输电
晶闸管
阻抗特性
时变阻抗
等效电路模型
HVDC
thyristor
impendence character
time-varying impendence
equivalent circuit model
