中文摘要：

针对有源电力滤波器（APF）补偿谐波电流时纹波较大的问题,对二极管箝位型（NPC）三电平APF的LCL滤波器设计和分析方法进行了研究.分析了滤波电感、电容和阻尼电阻等各个参数对LCL滤波器的影响,给出了LCL滤波器的设计原则和约束条件,提出了一种简单实用的LCL滤波器设计方法.首先,根据有源电力滤波器需要补偿谐波电流的最高次数和开关频率选定LCL滤波器谐振频率；然后,为了解决低频谐波电流和高频开关纹波电流互相干扰的问题,同时为了减小电感体积、节约成本,根据设计原则和约束条件对LCL的各个参数进行了优化设计；最后,在5 kVA三电平并联型有源电力滤波器实验平台上进行了实验验证.实验及研究结果表明,该设计方法在保证有源电力滤波器高补偿带宽的同时可以有效降低其纹波电流.

英文摘要：

Aiming at achieving low switching frequency current for active power filters （APF）,the design of LCL-filter for APF using neutral point clamed converter was studied.Affections of different parameters were analyzed.Then,constraints and principles on LCL-filter design were concluded.A simple and practical design procedure of LCL-filter was proposed subsequently.Firstly,the resonant frequency of LCL-filter was set according to the highest harmonic order and switch frequency.Then,the parameters of the LCL-filter were optimized based on the design principles and constraints with smaller volume and lower cost.Finally,the theory was verified by experiment in a 5 kVA shunt APF systems.The results indicate that,the proposed design can effectively eliminate the switching current without reducing the bandwidth of APF.