ABSTRACT This paper presents a modified topology for asymmetric modular multilevel inverter as a fundamental block. It consists of eight switches (including six bidirectional-conducting unidirectional-blocking switches and two bidirectional-conducting bidirectional-blocking switches) and four DC sources with unequal magnitudes, which generates 13-level output voltage. The proposed topology offers special features such as reduced number of switches, isolated DC sources, economical and less complexity with modular structure as compared to other contemporary topologies. Moreover, significant reduction in switch voltage can be achieved. The comparative study of proposed topologies with the conventional and recent topologies have been presented in terms of power switches, gate drivers, isolated DC voltage sources and total standing voltage on the switches. A multicarrier-based sinusoidal pulse width modulation scheme is adopted for generating the gate pulses using real-time simulation with dSPACE DS 1104. The proposed topology offers a fewer number of ON-state switches which lead to the reduction in power loss. The feasibility of proposed multilevel inverter, the simulation and experimental results are analysed under steady state and dynamic states.

中文翻译：

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组件数量较少的非对称模块化多电平逆变器的建模与仿真

摘要 本文提出了一种以非对称模块化多电平逆变器为基本块的改进拓扑。它由8个开关（包括6个双向导通单向阻断开关和2个双向导通双向阻断开关）和4个大小不等的直流电源组成，产生13级输出电压。与其他当代拓扑相比，所提出的拓扑提供了一些特殊功能，例如减少了开关数量、隔离的直流电源、经济且模块化结构的复杂性较低。此外，可以实现开关电压的显着降低。在电源开关、栅极驱动器、隔离的直流电压源和开关上的总常压。采用基于多载波的正弦脉宽调制方案，使用 dSPACE DS 1104 进行实时仿真来生成门脉冲。所提议的拓扑提供较少数量的导通状态开关，从而降低了功率损耗。对所提出的多电平逆变器的可行性、稳态和动态状态下的仿真和实验结果进行了分析。