HL-2A装置MW级中性束加热系统灯丝电源设计与仿真分析

Design and simulation analysis of filament power supply for MW neutral beam heating system of HL-2A tokamak

介绍了HL-2A装置中性束加热系统阴极灯丝电源的主电路拓扑结构、控制硬件及控制时序等。运用MATLAB仿真软件对灯丝电源主回路进行了反馈控制仿真,发现电流在1000A左右时,纹波约为1%,而电流降低至200A时,纹波增大,约为3%。分别去掉低位控制柜内进线端的串联交流滤波电抗器L1和并联LC谐波滤波器进行仿真,结果显示输出电流纹波明显变大,说明L1和LC除了能够吸收谐波电流减少进入电网谐波的作用外,还能够对交流调压后的斩波波形进行一定的滤波作用,使得输出波形更加平滑。

The main circuit topology, control hardware and control sequence of the cathode filament power supply for the HL-2A neutral beam heating system was introduced. Feedback control simulation of main circuit of filament power supply is carried out through MATLAB simulation software. It is found that the ripple factor is about 1%when the current is about 1000A, and the ripple coefficient increases to 3% when the current drops to 200A. Without the AC filter reactor in series L1 and parallel harmonic filter LC in the low level control cabinet, the output current ripple coefficient becomes larger obviously. It shows that L1 and LC not only absorb harmonic current, but also filter the chopper waveform after AC voltage regulation to make the output waveform smoother.