一种新型零序分量注入三电平调制策略

A Novel Modulation Strategy for Three-level Based on Zero-sequence Component Injection

为了解决传统三电平空间矢量调制(SVM)策略实现复杂的问题,提出了一种基于零序分量注入的三电平逆变器新型调制方法。该方法与传统的SVM完全等效,但实现简单且无需复杂的扇区判断。零序分量在整个复平面内具有统一的表达式,其选择仅基于三相调制波的大小和逻辑关系。同时,通过改变零序分量表达式中的比例系数很容易实现中点电压平衡控制。仿真和实验结果验证了该方法的有效性。

The traditional three-level space vector modulation (SVM) strategy is complicated. In order to solve this prob lem ,a novel three-level modulation strategy based on zero-sequence component injection is proposed. The method, which is equivalent to SVM, is simple and does not require any complicated sector estimations. The zero-sequence component has a piecewise but uniform expression in the whole complex plane and the selection of it is entirely based on the size and logical relationship of the three-phase modulation waves. Meanwhile, the neutral-point voltage balance control can be realized directly by changing the proportion coefficient in the expression of the zero -sequence component.Simulation and experimental results validate the effectiveness of the proposed method.