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首页> 外文期刊>International journal of electrical power and energy systems >Isolated single-phase single-stage DC-AC cascaded transformer-based multilevel inverter for stand-alone and grid-tied applications
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Isolated single-phase single-stage DC-AC cascaded transformer-based multilevel inverter for stand-alone and grid-tied applications

机译：用于独立和网格连接应用的基于单相单级DC-AC级联变压器的多相单级DC-AC级联变频器

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摘要

This paper proposes a new single-phase DC-AC Cascaded Transformer-based Modular Multilevel Inverter (CTMLI) with its PWM switching technique considering minimum components count per output voltage level. The proposed CTMLI converts the constant input DC voltage to 19-level AC voltage at its output terminals in a single-stage using only three full-bridge (FB) circuits in addition to three single-phase cascaded transformers. The three FB circuits are connected in parallel to the same DC supply, whereas the output terminals of the cascaded transformers are connected in series. In order to realize the 19-level output voltage, each FB circuit is controlled by different switching frequency and each single-phase transformer has different turn's ratio. Detailed mathematical model of the proposed CTMLI is presented considering the optimal transformer turn's ratio in addition to the power distribution among them. Also, cost estimation model for the MLI is presented in details in order to investigate the cost reduction in the proposed CTMLI. In addition, a detailed comparison with the recently published MLI is presented to confirm the merits of the proposed inverter. The validity of the proposed CTMLI has been investigated experimentally using laboratory prototype (220 V, 1.2 kW) controlled with dspace DS 1103 digital controller in stand-alone applications considering closed-loop voltage control and in grid-tied applications considering closed-loop current control.
机译：本文提出了一种新的单相DC-AC级联变压器基模块化多级逆变器（CTMLI），其PWM切换技术考虑了每个输出电压电平的最小部件计数。除了三个全桥（FB）电路之外，所提出的CTMLI在其输出端子上将恒定输入DC电压转换为19级AC电压，除了三个全桥（FB）电路，除了三个单相级联变压器之外。三个FB电路并联连接到相同的直流电源，而级联变压器的输出端子串联连接。为了实现19级输出电压，每个FB电路由不同的开关频率控制，每个单相变压器具有不同的转向比。考虑到它们之外的功率分布，提出了所提出的CTMLI的详细数学模型。此外，详细介绍了MLI的成本估计模型，以研究所提出的CTMLI的成本降低。此外，提出了与最近发表的MLI进行了详细的比较以确认所提出的逆变器的优点。通过在考虑闭环电压控制和考虑闭环电流控制的网格连接应用中，使用实验室原型（220V，1.2 kW）通过实验，使用实验室原型（220 V，1.2 kW）进行实验研究了所提出的CTMLI的有效性。 。

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