有源电力滤波器中双向快速充放电DC-DC变换器设计及仿真

为了满足强磁场装置电源供电极低电流纹波的要求,采用了并联有源电力滤波器。首先简述了并联有源电力滤波器的工作原理,并设计了一种新型的双向DC-DC变换器取代了以往并联有源电力滤波器中使用的水冷电阻,实现了对并联有源电力滤波器中的电容器进行快速充电与快速放电,从而降低了能量损耗。然后详细分析了变换器快速充电与快速放电的工作过程,并给出了具体的设计参数。最后进行了仿真验证,通过仿真波形可以看出,该双向DC-DC变换器可以正常工作,能够顺利实现能量的双向流通,满足并联电力有源电力滤波器的设计要求。     

基于能量回馈和注入补偿的直流有源滤波器设计

为了提高一个稳态强磁场实验装置(SHMFF)电源系统中直流有源滤波器的滤波效果,将其纹波电流降低至万分之一,借鉴其他稳态强磁场实验装置中串联调整有源滤波器的优点,提出了一种新型的基于能量回馈和注入补偿的并联型线性调整有源滤波方案。对组成该有源滤波器的电源模块、功率器件模块及其控制系统进行详细分析可知,该有源滤波装置的容量显著降低,且大大提高了装置的效率。实验结果表明,该滤波器能够将纹波电流限制在允许的范围内,具有低功耗、高效率的优点。     

一种改进的七电平逆变器对比仿真研究

结合二极管钳位型三电平和传统两电平逆变器的特点,本文提出一种新型的七电平逆变电路拓扑。新型电路拓扑所用的开关管的数量和三电平相同,但是电平数大大提高,波形也更加近似于正弦波。本文对该逆变器的控制方法进行了分析。基于Matlab,搭建仿真电路,证明其控制方法的可实现性。     

Study on a Highly Stabilized Power Supply for Hybrid-Magnet Superconducting Outsert

The superconducting outsert of the 40 T hybrid-magnet in High Magnetic Field Laboratory （HMFL） of Chinese Academy of Sciences （CAS） requires a highly stabilized power supply. In this paper, two kinds of power supply design are briefly presented and both advantages and disadvantages are analyzed. In order to overcome the drawbacks of switching power supply, a series regulated active filter is adopted and a new design is proposed which ensures cooperative relationship between the feedback control loops of the switching converter and the series regulated active filter. Besides, unlike the traditional switching power supply, which can generate positive voltage only, this new design can also generate negative voltage which is needed in the quench protection for the superconducting magnet. In order to demonstrate the effectiveness of the methodology, a low-power prototype has been accomplished. The simulation and experiment results show that the power supply achieves high precision under the combined action of two feedback control loops. The peak-to-peak amplitude of the output ripple voltage of the prototype is 0.063%, while the peak-to-peak amplitude of the output ripple current is 120 ppm.     

基于SG3525的串联谐振式脉冲高压电源的研制

介绍了一种基于SG3525为控制核心的串联谐振式高压电源的新型设计方法。该电源功率主电路采用串联谐振式全桥逆变电路。通过实验表明,该电源具有效率高,稳定性好,电压纹波小等优点,主要用于高压除尘,工业脱硫脱硝等方面。