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Improved pulse-width modulation scheme for T-type multilevel inverter

机译：T型多电平逆变器的改进脉冲宽度调制方案

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摘要

In recent times, reduced switch count multilevel inverter (RSC-MLI) has become an emerging area of research in power electronic converters. To control these RSC-MLI topologies, various novel modulation schemes are reported. Multi-reference is one of such modulation scheme reported for various RSC topologies, such as T-type. However, the performance of this conventional scheme results in high total harmonic distortion (THD) in line voltages, when compared with the conventional level shifted pulse-width modulation scheme. This observation is clearly presented in this study and the reason for its degraded THD performance has been deeply discussed. To alleviate this problem, a modified multi-reference dual-carrier modulation technique with multiple references and two carriers is proposed. To implement this proposed modulation technique, an alternate carrier and modulation signals arrangement with multiple carriers and single reference is also presented. Finally, a comparative THD performance of the proposed and conventional modulation schemes is carried out on a five-level T-type MLI and obtained simulation results are validated experimentally.
机译：近年来，减少开关数量的多电平逆变器（RSC-MLI）已成为电力电子转换器研究的新兴领域。为了控制这些RSC-MLI拓扑，已报告了各种新颖的调制方案。多参考是针对各种RSC拓扑（例如T型）报道的这种调制方案之一。然而，与常规的电平移位脉冲宽度调制方案相比，该常规方案的性能导致线电压中的高总谐波失真（THD）。这项研究清楚地表明了这一观察结果，并深入讨论了其THD性能下降的原因。为了缓解这个问题，提出了一种具有多个参考和两个载波的改进的多参考双载波调制技术。为了实现该提出的调制技术，还提出了具有多个载波和单个参考的备用载波和调制信号布置。最后，在五级T型MLI上对提出的调制方案和常规调制方案的THD性能进行了比较，并通过实验验证了获得的仿真结果。

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