In order to improve the speed regulation performance of induction motors, a multimodulation times space vector pulsewidth modulation (MMT-SVPWM) is proposed for the three-level neutral point clamped (NPC) converter. This method can eliminate the dead-time effect (DTE), which is caused by the addition of the dead time (DT) in the SVPWM. This article first analyzes the deviation of the output voltage that is caused by the DTE in the SVPWM, and then proposed the MMT-SVPWM. The generation of driving signals in this method is different from the ideal SVPWM. According to the directions of three-phase currents, the driving signals of a pair of complementary power switches are obtained by comparing a pair of multiple modulation times with the triangular carrier. Thus, this method directly eliminate the DTE, which is different from the SVPWM with DT. The output voltage vector is the same as that of the ideal SVPWM, and there is no zero-current clamping effect. Finally, the simulation and experimental results show that the proposed method effectively eliminates the DTE and improves the output currents of the three-level NPC converter.

中文翻译：

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用于消除三电平中性点钳位转换器中的死区时间效应的多调制时间SVPWM

为了提高感应电动机的调速性能，针对三电平中性点钳位（NPC）转换器提出了多调制倍空间矢量脉宽调制（MMT-SVPWM）。这种方法可以消除由SVPWM中增加的死区时间（DT）引起的死区时间效应（DTE）。本文首先分析了SVPWM中DTE引起的输出电压偏差，然后提出了MMT-SVPWM。用这种方法产生的驱动信号不同于理想的SVPWM。根据三相电流的方向，通过将一对多个调制时间与三角形载波进行比较，可获得一对互补功率开关的驱动信号。因此，该方法直接消除了DTE，这与带DT的SVPWM不同。输出电压矢量与理想SVPWM的输出电压矢量相同，并且没有零电流钳位效应。最后，仿真和实验结果表明，该方法有效消除了DTE，提高了三电平NPC变换器的输出电流。