稳态强磁场电源直流有源滤波器研究

对稳态强磁场装置电源所需的直流有源滤波器(DAF)进行了设计，提出了利用PWM及并联有源滤波技术的滤波方案。根据其实际负载特性，通过检测负载端电压，利用PWM控制技术产生DAF所需电流并补偿纹波电流。通过对负载侧的滤波电容进行充、放电来调整负载端电压，从而实现负载电流的低纹波。分析表明，该系统具有良好的快速跟踪性能及对谐波很好的抑制效果。仿真结果表明该有源滤波器的良好性能，尤其对低次谐波的抑制更为明显。实验室研样机验证了所提出方案的可行性。

Development of DC active filter for high magnetic field stable power supply

The DC active filter (DAF), with very low current ripple, of the stable power supply system of high magnetic field device is developed by using the PWM and parallel active power filter technique. Due to the PWM control technique, the required DAF current can be obtained and the current ripple can be compensated by means of monitoring the load voltage, and the current ripple becomes very low by adjusting the load voltage. The simulation and analysis show that this system can respond to the reference quickly and is effective in suppressing the harmonics, especially the low-order harmonics. The feasibility of the proposed scheme is proved on the equipment built in the laboratory.