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用特征网络优化开关频率的SVPWM控制方法

, PP. 49-55

Keywords: 逆变器,多电平,空间矢量调制,开关频率,特征网络

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Abstract:

在α′β′平面中研究多电平逆变器的空间矢量调制技术,分析了基本矢量的分布规律,利用特征四边形和特征网络的概念,沿特征网络遍历扇区的各个顶点,对逆变器开关频率进行优化,能得到很低的开关切换次数。本文针对三级七电平逆变器进行分析,根据参考电压调制系数的变化,将特征四边形分成三个类型,并分别给出了开关切换次数的计算方法。最后,仿真和实验结果表明该算法是正确的,且实验得到的相电压能很好地逼近参考电压。与同相层叠正弦调制算法比较,该算法开关切换次数降低到38.6%左右。

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