EAST中性束注入用直流高压缓冲器磁滞模型分析  

Analysis on the Hysteresis Model of Core Snubber for EAST Neutral Beam Injector

作　　者：谢飞[1,2] 李格[1] 程德胜[1] 

机构地区：[1]中国科学院等离子体物理研究所,合肥230031 [2]顺德职业技术学院电信工程系,顺德528300

出　　处：《高电压技术》2013年第4期896-902,共7页High Voltage Engineering

基　　金：国家磁约束核聚变能研究专项基金(2010GB108003)~~

摘　　要：直流高压缓冲器是国家大科学工程先进实验超导托卡马克(EAST)中性束注入(NBI)系统中保护强流离子源的重要装置。为设计高可靠性的直流高压缓冲器,在Fink、Baker和Owen(简称F-B-O)直流高压缓冲器采用时变等效电阻而忽略并联电感的模型基础上,结合平行四边形磁滞模型,建立了时变等效电阻和电感并联的模型,推导出时变等效电感随饱和深度的解析式,并建立了相应的仿真模型。仿真结果与实测结果基本符合,修正后的模型在30kV以下低电压作用下与F-B-O原模型符合,在30～80kV电压作用下,随着铁芯叠片饱和深度逐渐升高,时变等效电感作用引起的故障电流比理论计算值高10%～30%。Core snubber is one of the most important devices in experimental advanced superconducting tokamak （EAST） neutral beam injector（NBI） syetem, which is designed to protect the neutral beam injector system during the period of high voltage breakdown. The theory for core snubber was developed by Fink, Baker and Owen（F-B-O） model which considered only the snubber resistance effects and ignored the effect of inductance condition. We proposed an approach to limit the high voltage breakdown effects by the concepts of the equivalent resistance and inductance in parallel mode implemented with Deltamax cores. Thereafter, a series of related formulas were deduced and the circuit fault simulation code was primarily established which could simulate fault conditions with above time- varying resistance and inductance. This snubber was tested at voltage below 100 kV with 4 nF discharge capacitor. The results show that the fault peak current is higher than that by the original F-B-O model between 30 kV to 80 kV of the test conditions. High voltage fault current is 10% - 30% higher than the theoretical value. The simulation code is calibrated with the test results.

关 键 词：中性束注入 NBI EAST 直流高压缓冲器 平行四边形磁滞模型 时变电感 放电试验 故障电流 

分 类 号：TL631.24[核科学技术—核技术及应用]