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首页> 外文期刊>Power Electronics, IET >New bidirectional multilevel inverter topology with staircase cascading for symmetric and asymmetric structures
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New bidirectional multilevel inverter topology with staircase cascading for symmetric and asymmetric structures

机译：具有对称和不对称结构的阶梯式级联的新型双向多电平逆变器拓扑

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摘要

Inverters, as one of the key components of electrical systems, have experienced a great evolution in the last decade, and their performance improvement is a challenge even today, leading to many researches on topologies and control schemes. This study introduces a new multilevel converter topology which is able to supply bidirectional current loads. The proposed structure has fewer power electronic devices such as power switches, driver circuits, power diodes, and DC voltage sources and, can be designed in both symmetric and asymmetric structures. In order to increase the number of output levels and the proposed basic unit development, modular expansion or cascading methods can be used. This study demonstrates that the aforementioned methods have the best results in asymmetric and symmetric structures of the proposed topology, respectively. The comparison between the proposed converter and some previous topologies shows that it has better conditions with respect to the used semiconductor count, switching and conduction losses, and total blocking voltage. The operation and performance of the proposed multi-level converter have been ascertained through simulations and verified experimentally for a single-phase symmetric thirty-one-level inverter which shows the proposed converter's ability in smooth sinusoidal output voltage generation with minimum total harmonic distortion.
机译：逆变器作为电气系统的关键组件之一，在过去的十年中经历了巨大的发展，即使在今天，其性能的提高仍然是一个挑战，导致人们对拓扑和控制方案进行了许多研究。这项研究介绍了一种新的多电平转换器拓扑，该拓扑能够提供双向电流负载。所提出的结构具有较少的功率电子设备，例如功率开关，驱动器电路，功率二极管和直流电压源，并且可以设计成对称和非对称结构。为了增加输出级别的数量和建议的基本单元开发，可以使用模块化扩展或级联方法。这项研究表明，上述方法分别在所提出拓扑的不对称和对称结构中具有最佳结果。所提出的转换器与某些先前拓扑之间的比较表明，就使用的半导体数量，开关损耗和传导损耗以及总阻断电压而言，它具有更好的条件。通过仿真确定了所提议的多电平转换器的操作和性能，并针对单相对称三十一电平逆变器进行了实验验证，该逆变器显示了所提议的转换器在产生平滑正弦输出电压且具有最小总谐波失真的能力。

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