两种空间矢量脉宽调制生成方法的分析与比较

Analysis and Comparison of Two Methods of SVPWM

通过对电压空间矢量脉宽调制(SVPWM)原理的介绍及算法的分析,在TMS320LF2407上分别以2种方法实现了SVPWM波形的输出,并对这2种实现方法的输出效果进行了比较,同时就零矢量分布方式的不同对磁链合成及死区的影响角度分析了两者之间的差异。仿真和实验结果证明,与零矢量集中分布方式相比,零矢量均匀分布方式对磁链造成的谐波分量小,但其基波分量也小,低频时尤为显著。

In this article, the principle and arithmetic of SVPWM are introduced. Based on DSP TMS320LF2407, two SVPWM methods, which is different in the insertion of the zero vectors, are realized. Furthermore, output waveforms of the two methods are analyzed and compared. Finally, the difference between them is analyzed from the angle of the effect to synthesis of flux and dead-time due to the different distributing ways of zero-vector. Simulation and experimental results show that, both the fundamental harmonic and the other harmonics of the flux caused by symmetrical distributing way of zero-vector are smaller than that caused by concentrated distributing way of zero-vector, which is especially noticeable in the low speed region.