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Design and preliminary experimental results of 5 MW-NBI arc power supply for HL-2M tokamak
Fusion Engineering and Design ( IF 1.7 ) Pub Date : 2021-07-09 , DOI: 10.1016/j.fusengdes.2021.112728
Puqiong Yang 1 , Bo Liu 1 , Ying Zhang 2 , Huiling Wei 3 , Weimin Xuan 3
Affiliation  

Due to the nonlinear characteristic of the gas-discharge plasma and influenced of the gas pressure, outside magnetic field and state of cathode, the arc discharge process in ion sources for neutral beam injection(NBI) is difficult to be closed-loop controlled stably with the arc power supply (APS). A 5 MW-NBI APS for HL-2M tokamak based on super capacitor energy storage and switching power technology is designed, results are presented in this paper. A structure of multiple composite chopping is used on the DC/DC converter of the APS power circuit, which is composed of ten interleaving buck converters. With the increasing of the operating frequency, the volume and weight of the filter inductor have been greatly reduced. The APS obtains a higher di/dt and a rapid dynamic response, and the stability of the closed-loop control has been significantly increased. The electrical parameters of factory test of the APS: the maximum output specification is 220 kW/1500 A, output ripple current less than 1%, current rise-times in the order of 100 μS, maximum overshoot less than 3%. The preliminary experimental results of arc discharge showed that: the APS has the characteristics of excellent constant current, and fits well in all kinds of arc discharge experimentations including constant voltage control mode, small arc current discharge cleaning, rating current beam extraction etc.

中文翻译:

HL-2M托卡马克5MW-NBI电弧电源设计及初步实验结果

由于气体放电等离子体的非线性特性,以及气体压力、外磁场和阴极状态的影响,中性束注入(NBI)离子源的电弧放电过程难以实现闭环稳定控制。电弧电源 (APS)。设计了一种基于超级电容储能和开关电源技术的HL-2M托卡马克5MW-NBI APS,并给出了结果。APS电源电路的DC/DC变换器采用多重复合斩波结构,由10个交错的Buck变换器组成。随着工作频率的提高,滤波电感的体积和重量已大大减小。APS获得了更高的di/dt和快速的动态响应,闭环控制的稳定性显着增加。APS出厂测试电参数:最大输出规格220kW/1500A,输出纹波电流小于1%,电流上升时间100μS量级,最大过冲小于3%。电弧放电初步实验结果表明:APS具有优良的恒流特性,适合恒压控制方式、小弧流放电清洗、额定电流束流提取等各类电弧放电实验。
更新日期:2021-07-09
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