一种新颖的三相逆变器解耦方法

作者：郭国强1，吴为麟1，何建剑2 日期：2008-06-23/span> 浏览：4114 查看PDF文档

一种新颖的三相逆变器解耦方法

郭国强1，吴为麟1，何建剑2
(1.浙江大学 电气工程学院，浙江 杭州 310027； 2.宁夏宁东供电局，宁夏 银川 750001)

摘要：在对三相逆变器系统的主电路拓扑结构进行了理论分析的基础上，根据三相逆变器的中点电压同逆变桥开关状态相对应这一特性，提出了一种正弦脉宽调制（SPWM）控制的新的四桥臂三相逆变器拓扑结构，该结构通过第4桥臂的多电平输出来控制三相逆变器中点电压，实现了逆变器三相电压的解耦控制。最后采用Matlab进行了仿真实验。实验结果表明，该方法易于实现带不平衡负载、非线性负载等多种情况。
关键词：三相逆变器；中点电压；解耦；四桥臂；正弦脉宽调制
中图分类号：TM464文献标识码：A文章编号：1001-4551(2008)06-0057-03

A novel decoupling method of threephase inverter
GUO Guoqiang1, WU Weilin1, HE Jianjian2
(1.College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China;
2.Ningxia Ningdong Power Company Supply Bureau, Yinchuan 750001, China)
Abstract: The main circuit topology structure of threephase inverter was theoretically analyzed. Based on the characteristic of the midpoint voltage of threephase inverter corresponds with the switch state, a new topology of fourleg threephase inverter controlled by sine pulse width modulation (SPWM) was proposed. Through the multilevel output of fourth bridge leg to control the midpoint voltage of threephase inverter, a threephase inverter voltage decoupling control was achieved. By the Matlab simulation, the results show that the method is easy to be realized with unbalanced load, nonlinear loads, and other conditions.
Key words: threephase inverter; midpoint voltage; decoupling; fourbridge legs; sine pulse width modulation(SPWM)
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