摘要
为了提高兆瓦级中性束注入器束流引出成功率及品质,利用IGBT能快速开关及其高载流能力的特点研制了全固态抑制极电源。该电源主要由10个500 V/20 A的模块电路依次串联组成,每个模块由隔离变压器、整流滤波、IGBT管及其驱动电路、续流二极管及辅助供电组成。各模块间通过光纤由嵌入式系统STM32实现参数设置、控制和保护监测。同时对抑制极电源与加速极电源及三电极加速器之间的连接及保护方式进行分析,在极间打弧状态,并满足最小抑制时间13 ms的情况下,优化计算得到储能电容最小值为500μF及串接保护电阻为200?。通过测试,可得电源单独输出电压达到5 kV,峰值电流40 A,能在20μs内快速保护关断。同时在中性束引出系统中使用新旧抑制极电源开展对比实验,结果表明:全固态抑制极电源束流引出成功率增加20%以上,达到系统设计要求。
The success rate and quality of the neutral beam extraction are determined by the ability of suppressed electron and the reliability of the suppressed grid power supply （SGPS）. The full solid SGPS is developed based on IGBT＇s characteristics of the 5 MW level neutral beam injection （NBI） on HL-2M Tokomak. The power supply consists mainly of 10 modules in series, with index 500 V/20 A. Each of the modules has the isolated transformer, the rectifier, the filter, IGBT switch, drive circuit, diode, and auxiliary DC source. The embedded systems STM32 are used for controlling these modules via fibers, setting output voltage, monitoring the current and protecting the SGPS. The optimized analysis are carried out, including the connection mode of the three-electrode accelerator between SGPS and the accelerator power supply and protection method. Assuming the minimum suppress time is 13 ms in the arcing state, the optimization of the minimum value of the capacitor is 500 μF and the protection resistor in series between SGPS and the suppress grid is 200 Ω. Our experiments demonstrate that the output with amplitude of 5 kV and peak current of 40 A are available in operation alone, and can be turned off within 20 microseconds to protect the SGPS. At the same time,compared the new full solid SGPS with the previous equipment on NBI system, the experimental results show that the extracted beam success rate will increase more than 20%. The whole SGPS meets the requirements of NBI system.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2017年第6期1887-1892,共6页
High Voltage Engineering
基金
国家国际热核聚变实验堆(ITER)计划项目(2012GB104000)
国家自然科学基金面上项目(11675074)~~
关键词
中性束注入器
三电极加速器:抑制极
高压电源
嵌入式系统
neutral beam injection （NBI）
three electrode accelerator
suppress grid
high-voltage power supply
embedded system
