基于虚拟阻抗且提高系统带宽的抑制两级式逆变器中二次谐波电流的控制策略

被引:12
作者
张力
任小永
阮新波
机构
[1] 南京航空航天大学航空电源重点实验室
关键词
两级式单相逆变器; 二次谐波电流; 虚拟阻抗; 虚拟电阻; 带宽; 带通滤波器;
D O I
10.19595/j.cnki.1000-6753.tces.2014.06.018
中图分类号
TM464 [逆变器];
学科分类号
摘要
两级式单相逆变器的瞬时输出功率中存在脉动功率,使得前级直流变换器中产生二次谐波电流。为了减小该二次谐波电流,本文提出了基于虚拟阻抗的二次谐波电流抑制方法,并针对虚拟阻抗为电阻的情形,给出了一种闭环参数的设计方法。为了提高带宽,提出一种带有带通滤波器电感电流反馈的二次谐波电流抑制方法,并在带通滤波器中加入阻尼电阻,使得该种控制方法不仅能显著减小前级直流变换器中的二次谐波电流,还能改善变换器的动态特性,并保证系统稳定工作。最后,研制了一台1kV·A原理样机并进行了实验验证,实验结果证明了所提出控制策略的有效性。
引用
收藏
页码:136 / 144
页数:9
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