双环控制三相逆变器输出直流分量分析与控制  

Analysis and Control for DC Bias in Three-phase Inverter Based on Dual-loop

作　　者：阳习党[1] 王恒利[1] 揭贵生[1] 吴彬[1] 

机构地区：[1]舰船综合电力技术国防科技重点实验室、海军工程大学,湖北武汉430033

出　　处：《电力电子技术》2014年第7期45-47,70,共4页Power Electronics

基　　金：国家高技术研究发展计划863项目(2011AA04-0302,2013AA05404);国家重点基础研究发展计划973项目(2012CB215103,2013CB035601)~~

摘　　要：三相逆变器参考值含有直流偏置、调理电路的零点漂移及其数字控制中的截断误差等都会引起输出电压中包含直流分量,因此必须对其输出电压的直流分量进行调偏控制。此处提出一种解决方案,通过检测负载电流中所包含的直流分量,经隔离滤波后来调节正弦脉宽调制(SPWM)脉宽。该方案已成功应用在450 kVA三相逆变器中。实验证明,该方案可有效抑制三相逆变器输出电压的直流分量,且简单易于实现。DC bias of mverters output voltage is introduced by bias of reference, sampling circuit drift, truncation error of digital control and so on.It must be offset DC bias.One solution is proposed to overcome the problem.Firstly,we can detect the DC component value of the load current, and put it through isolate and filter modules.Secondly, we can feedback the value to adjust the width of sine pulse width modulation （SPWM） pulse.The experimental results on a 450 kVA three-phase inverter show that this method can be effective for restraining DC bias for the output voltage of three-phase inverter and it is easy to realize.

关 键 词：逆变器 直流偏置 带通滤波器 

分 类 号：TM464[电气工程—电器]