三相变流器的谐波/间谐波统一调制分析建模

为有效揭示谐波、间谐波的产生机理,建立准确的变流器分析模型,直接从变流器的工作过程入手,引入开关调制函数,通过建立三相变流器的调制分析模型,将各种变流器的谐波分析模型较好地统一起来。分析变流器交直流侧间的频率变换关系能够很好地反映变流器两侧各种谐波和间谐波的产生过程,在此基础上指出变流器直流侧含有非整数倍基频干扰项是交流侧出现间谐波的直接原因,综合了谐波和间谐波的分析过程。该分析方法具有直观和普适性好等特点,并能直接延拓到其它各种变流器的谐波和间谐波的产生过程分析。仿真实验验证了该方法的有效性。

Uniform Modulation Modeling of Three-phase Converter for the Analysis of Harmonic/Interharmonic

To analyze the mechanism of generation of the harmonic and interharmonic,this paper introduced the switch modulation function in the actual action process of the converter,and established the modulation model for the converter,thereupon,the analysis model for various converters can be unified.Based on the analysis of the frequency transform rules,the production course of the harmonic and interharmonic in the two sides of the converter can be revealed.And it is revealed that the interference of un-multiple power frequency in the DC side is the direct cause for the interharmonic in the AC side,then the analysis method for the harmonic and interharmonic can be integrated together.The adopted method has the traits of intuitionistic and universal application. And it can be used directly to analyze other topology of converter.Finally,the simulation results approved the validity of the adopted method.