一种新型的混合级联多电平逆变器  

A New Type of Hybrid Cascaded Multilevel Inverter

作　　者：夏华[1] 李磊[1] 薛媛媛[1] 徐烨[1] 

机构地区：[1]南京理工大学自动化学院,江苏南京210094

出　　处：《电源学报》2013年第5期37-41,共5页Journal of Power Supply

基　　金：国家自然科学基金资助项目(51177073)

摘　　要：在中高压大功率场合级联H桥多电平逆变器受到了越来越多的关注。混合级联多电平逆变器是传统级联多电平逆变器拓扑的改进,它的直流侧电压幅值不同。混合级联多电平逆变器最大的优点是在得到相同电平数目的情况下,大大减少了独立直流电源的数目。但是,在一些应用场合,直流电源只能为一个。针对这个问题,在直流侧加入高频环节,得到了一种新型的混合级联多电平逆变器,实现了单直流电源供电,而且这种逆变器的输出电压THD较低,系统体积小。文中首先介绍了基于高频环节混合级联多电平逆变器的电路结构,分析了该结构功率分布问题,针对最近电平逼近调制策略下的输出电压低次谐波较大的问题,改进了控制方法,最后通过软件仿真验证了改进控制方法的可行性。Cascaded H-bridge multilevel inverters have been very popular in medium-voltage applications. The hybrid CHB multilevel inverter, using dc supplies with different voltages, is an improvement of cascaded H-bridge multilevel inverters. The main advantage of hybrid CHB multilevel inverters is the optimization of levels with a minimum number of power supplies. But in some occasions, there can be only one dc supply. So it is realized it in the hybrid CHB inverter using a high frequency link. This method has the advantages of low total harmonic distortion and small volume. The circuit of the inverter, power distribution and control strategy were deeply analyzed; also principle diagram of control circuit was given. In the view of the question of low-order harmonic, the control strategy was improved. At last, the correctness of this converter was verified through simulation tests.

关 键 词：高频环节 混合级联多电平 最近电平逼近调制 脉冲宽度调制 

分 类 号：TM464[电气工程—电器]