基于CSAPF的磁铁电源纹波抑制研究

加速器系统中由于大量非线性器件的存在产生了大量纹波，严重影响加速器磁场对粒子运动轨迹的控制。为实现对加速器直流电源纹波的抑制，相关研究主要集中在用电压型有源电力滤波器降低直流电源纹波，但该方法存在抑制精度不足、响应延时、开关设备损耗较大等问题。针对以上问题，本文比较了电流型和电压型有源电力滤波器的主电路拓扑结构，研究了电流型和电压型有源电力滤波器的脉冲宽度调制技术和控制策略，分析了在加速器系统中不同的有源电力滤波器对磁铁电源输出电流纹波的抑制性能。通过仿真分析与实验验证，发现电流型有源电力滤波器对磁铁电源输出电流纹波具有显著的抑制效果，并且电流型有源电力滤波器能够直接控制输出的纹波电流，纹波精度抑制更高，CSAPF投入后，负载电流纹波显著减小，电流纹波系数达到1.6×10–5。

Research on Ripple Suppression of Magnet Power Supply Based on CSAPF

Due to the existence of a large number of nonlinear devices in the accelerator system, a large number of ripples are generated, which seriously affects the control of the accelerator magnetic field on the particle trajectory. In order to realize the suppression of accelerator DC power supply ripple, related researches mainly focused on using voltage-type active power filter to reduce DC power supply ripple, but this method has problems such as insufficient suppression accuracy, response delay, and large switchgear loss. In view of the above problems, this paper compares the main circuit topology of current-type and voltage-type active power filters, investigates the pulse width modulation technology and control strategies of current-type and voltage-type active power filters, and analyzes the performance of different active power filters in the accelerator system to suppress the output current ripple of magnet power supply. Through simulation analysis and experimental verification, it is found that the current-type active power filter has a significant suppression effect on the output current ripple of the magnet power supply, and the current-type active power filter can directly control the output ripple current, and the ripple accuracy is suppressed more highly. With the CSAPF put into use, the load current ripple is significantly reduced, and the current ripple coefficient reaches 1.6×10–5.