Space vector modulation (SVM) strategy is widely used in two-level and three-level converters because of its advantages. However, the sector triangles, switching states, and switching sequences increase dramatically as the number of levels increases, which makes it difficult to implement the SVM algorithm in industrial applications of high-voltage and high-power multilevel converters. To extend the SVM strategy to high-voltage and high-power converters, a new SVM algorithm is proposed in this article with the 45° coordinates $\alpha ^{\prime }\beta ^{\prime }$ . In the $\alpha ^{\prime }\beta ^{\prime }$ coordinates, based on the relationship between the phase voltage and the line voltage of a star-connected converter, the reference vectors calculated from phase-voltage reference signals are directly used as line-voltage reference vectors. Moreover, two line-voltage levels are used as two components of the space vector, with the sum of these two components being the third line-voltage level. These three components are directly used as the switching state signals of the control line voltages. The proposed method avoids the 2/3 conversion that must be completed in the conventional SVM algorithm and does not need to calculate redundant switching states. It greatly simplifies the SVM algorithm and ensures that the common-mode voltage of the converter is zero. Finally, the proposed algorithm is validated with extensive experimental results.

中文翻译：

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空间矢量调制中的45°坐标α ^' β ^'为多电平变换器

空间矢量调制（SVM）策略由于其优势而被广泛用于两级和三级转换器。然而，随着等级数量的增加，扇形三角形，切换状态和切换序列急剧增加，这使得在高压和大功率多电平转换器的工业应用中难以实现SVM算法。为了将支持向量机策略扩展到高压大功率转换器，本文提出了一种新的支持角度为45°的支持向量机算法。$ \ alpha ^ {\ prime} \ beta ^ {\ prime} $ 。在里面$ \ alpha ^ {\ prime} \ beta ^ {\ prime} $根据星形连接转换器的相电压和线电压之间的关系，可以将根据相电压参考信号计算出的参考矢量直接用作线电压参考矢量。此外，两个线电压电平被用作空间矢量的两个分量，这两个分量的总和是第三线电压电平。这三个分量直接用作控制线电压的开关状态信号。所提出的方法避免了在传统的SVM算法中必须完成的2/3转换，并且不需要计算冗余的开关状态。它极大地简化了SVM算法，并确保转换器的共模电压为零。最后，该算法得到了广泛的实验结果的验证。