A new multilevel topology for an open-end winding motor drive is proposed in this article, presenting a similar structure to the cascaded H-bridge multilevel inverter. The proposed topology combines three-phase and single-phase conventional H-bridge voltage source inverters. The topology is flexible, allowing to increase the number of voltage levels through the simple integration of new single-phase H-bridge inverters connected in wye. Based on this topology, it is possible to obtain two different configurations. These modular multilevel topologies can be easily extended, both in terms of voltage level and the number of voltage levels. The topology is characterized by the capability to a supply higher voltage to the motor windings or use lower dc voltages when compared with classical solutions. Well-known modulation schemes, such as the multilevel sinusoidal pulsewidth modulation technique, can be easily adapted to the proposed topology. The operation and characteristics of the two configurations for the proposed multilevel topology are confirmed by several experimental tests realized through a laboratory prototype.

中文翻译：

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用于开端绕组感应电机驱动的三相和单相 H 桥级联多级结构

本文提出了一种用于开放式绕组电机驱动的新多电平拓扑，提出了与级联 H 桥多电平逆变器类似的结构。所提出的拓扑结合了三相和单相传统 H 桥电压源逆变器。该拓扑结构灵活，允许通过简单集成以 Y 形连接的新型单相 H 桥逆变器来增加电压等级的数量。基于此拓扑，可以获得两种不同的配置。这些模块化多电平拓扑可以在电压电平和电压电平数量方面轻松扩展。与传统解决方案相比，该拓扑的特点是能够向电机绕组提供更高的电压或使用更低的直流电压。众所周知的调制方案，例如多级正弦脉宽调制技术，可以很容易地适应所提出的拓扑。通过实验室原型实现的多次实验测试证实了所提出的多级拓扑的两种配置的操作和特性。