多电平逆变器快速空间矢量调制算法研究

Fast Algorithm for Space Vector Modulation of Multilevel Inverter

本文根据基本矢量在α′β′两相坐标平面的坐标都是整数的规律,总结得到了在α′β′两相坐标平面下对参考电压矢量进行逼近的算法,该算法只需要进行简单的四舍五入与加减运算,易于实现。最后,文章对参考电压提出了同步采样的要求,给出了空间矢量调制算法在α′β′平面上收敛和在abc平面上收敛的定义,并指出空间矢量调制算法的收敛性影响逆变器输出电压的次谐波。

Based on the rule that all the coordinate value of the basic vector is integral in α′β′ coordinate plane,an algorithm for approaching the reference vector in α′β′ coordinate plane was drawn out,which is easy to be realized by arithmetic and rounding operation.A demand of synchronized sampling was presented to the reference vector.In conclusion,the concept of convergent modulation algorithm in α′β′ coordinate plane and abc coordinate plane was put forward,which can affect the sub harmonic component of multi-level inverter＇s output voltage.