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A three‐phase inverter circuit using half‐bridge cells and T‐NPC for medium‐voltage applications
International Journal of Circuit Theory and Applications ( IF 1.8 ) Pub Date : 2020-07-06 , DOI: 10.1002/cta.2833 Abhilash Tirupathi 1 , Kirubakaran Annamalai 1 , Somasekhar Veeramraju Tirumala 1
International Journal of Circuit Theory and Applications ( IF 1.8 ) Pub Date : 2020-07-06 , DOI: 10.1002/cta.2833 Abhilash Tirupathi 1 , Kirubakaran Annamalai 1 , Somasekhar Veeramraju Tirumala 1
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Three‐phase single DC‐source based multilevel inverter topologies play a pivotal role in industrial applications due to the reduced number of components and higher efficiency. This paper emphasizes the inverter for medium‐voltage applications that employ a conventional three‐phase T‐type structure (T‐NPC). The primary circuit of the proposed configuration consists of a T‐NPC structure connected to the half‐bridge cells at the top and the bottom sides of each phase. The secondary circuit consists of DC‐link capacitors whose voltage balancing is attained through a separate voltage balancing circuit (VBC). Using the proposed configuration, the number of components and independent DC supplies are reduced compared with the conventional topologies such as a neutral point clamped (NPC) inverter, a flying capacitor (FC) inverter, and a cascaded H‐bridge (CHB) inverter for the same number of output voltage levels. Hence, the proposed topology results in the reduction of weight, volume, and power losses of the inverter. A sine‐triangle comparison method is employed in the field programmable gate array (FPGA) platform to generate the firing pulses of the circuit switches. The effectiveness of the proposed topology is verified with simulation studies and is experimentally validated with a scaled‐down prototype.
中文翻译：
使用半桥单元和T-NPC的中压应用的三相逆变器电路
基于三相单直流电源的多电平逆变器拓扑由于减少了组件数量和提高了效率，因此在工业应用中起着举足轻重的作用。本文重点介绍了采用常规三相T型结构（T-NPC）的中压应用的逆变器。提议配置的主要电路由一个T-NPC结构组成，该结构连接到每个相位的顶部和底部的半桥单元。次级电路由直流链路电容器组成，这些电容器的电压平衡是通过单独的电压平衡电路（VBC）实现的。与常规拓扑（例如中性点钳位（NPC）逆变器，飞跨电容器（FC）逆变器，以及具有相同数量输出电压电平的级联H桥（CHB）逆变器。因此，提出的拓扑结构导致逆变器的重量，体积和功率损耗减少。在现场可编程门阵列（FPGA）平台中采用正弦三角形比较方法来生成电路开关的触发脉冲。通过仿真研究验证了所提出拓扑的有效性，并通过缩小比例的原型进行了实验验证。
更新日期：2020-07-06
中文翻译：
使用半桥单元和T-NPC的中压应用的三相逆变器电路
基于三相单直流电源的多电平逆变器拓扑由于减少了组件数量和提高了效率，因此在工业应用中起着举足轻重的作用。本文重点介绍了采用常规三相T型结构（T-NPC）的中压应用的逆变器。提议配置的主要电路由一个T-NPC结构组成，该结构连接到每个相位的顶部和底部的半桥单元。次级电路由直流链路电容器组成，这些电容器的电压平衡是通过单独的电压平衡电路（VBC）实现的。与常规拓扑（例如中性点钳位（NPC）逆变器，飞跨电容器（FC）逆变器，以及具有相同数量输出电压电平的级联H桥（CHB）逆变器。因此，提出的拓扑结构导致逆变器的重量，体积和功率损耗减少。在现场可编程门阵列（FPGA）平台中采用正弦三角形比较方法来生成电路开关的触发脉冲。通过仿真研究验证了所提出拓扑的有效性，并通过缩小比例的原型进行了实验验证。
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