NPC逆变器特定谐波组消除法  

Selected Harmonic Group Elimination for NPC Inverters

作　　者：李涛[1] 张晓锋[1] 乔鸣忠[1] 

机构地区：[1]海军工程大学电气工程系,湖北武汉430033

出　　处：《电气传动》2011年第5期25-30,共6页Electric Drive

基　　金：国家自然科学基金(50277008)

摘　　要：针对传统特定谐波消除脉宽调制(SHEPWM)中所得触发角与调制比的非线性关系以及非线性超越方程组的困难求解,指出了SHEPWM中非线性超越方程组解的几何意义。基于此,设计了基于脉宽的谐波消除方法,仅需引入一个变量便可对任一次及其整数倍次的一组谐波进行消除。以5次组谐波和3次谐波消除为例,介绍了该方法在多个谐波消除中的应用,并对该方法所具备的谐波线性消除能力进行了分析。对所得结果进行谐波分析,证明该方法正确有效。Aims at the nonlinear relationship between trigger angles and modulation index derived by traditional SHEPWM as well as the difficulty to solve the nonlinear transcend equation group,the geometry meaning of the roots of nonlinear transcend equation group in SHEPWM was indicated.With this meaning,harmonic elimination methods based on pulse-width was derived.Only by using one variable,harmonic of certain frequency as well as frequency of integral times can be eliminated.By citing elimination of harmonic 3th and group 5th,the application of this method to multi-harmonic elimination was introduced.The abilities of this method to eliminate harmonic linearly was analyzed.The harmonic analysis of the results proves the validity and efficiency of this method.

关 键 词：特定谐波组消除 非线性方程 谐波线性消除 NPC逆变器 

分 类 号：TM464[电气工程—电器]