多级H桥并联变换器的谐波分析

Harmonic Analysis of Parallel Multi-Level H-Bridge Converter

在简要分析多重化变换器和多级H桥并联变换器系统特性的基础上,采用傅里叶分解的方法分析了多级H桥并联变换器消除低次谐波的机理,结果表明9个H桥并联变换器可以消除n=18k±1(k=1,2,3,…)次以外的谐波,具有减少对电网谐波污染的优点.最后,给出了PSPICE仿真和系统实验波形.

This paper simply describes the characteristics of multi_level converter and parallel multi_level H_Bridge converter, then mainly analyzes the principle of neutralizing lower harmonics in the parallel multi_level H_Bridge converter by means of Fourier analysis. According to the analysis, the converter consisted of 9 H_Bridge can eliminate the harmonics other than n class n=18k±1(k=1,2,3,…), and hardly pollutes the electricity grid. The simulation fulfilled by PSPICE and the experimental waveforms are also given.