Pakdel Majid, Jalilzadeh Saeid
University of Zanjan, Department of Electrical Engineering, Zanjan, Iran.
Sci Rep. 2017 Sep 29;7(1):12396. doi: 10.1038/s41598-017-12806-5.
In this paper a novel packed U cell (PUC) based multilevel grid connected inverter is proposed. Unlike the U cell arrangement which consists of two power switches and one capacitor, in the proposed converter topology a lower DC power supply from renewable energy resources such as photovoltaic arrays (PV) is used as a base power source. The proposed topology offers higher efficiency and lower cost using a small number of power switches and a lower DC power source which is supplied from renewable energy resources. Other capacitor voltages are extracted from the base lower DC power source using isolated DC-DC power converters. The operation principle of proposed transformerless multilevel grid connected inverter is analyzed theoretically. Operation of the proposed multilevel grid connected inverter is verified through simulation studies. An experimental prototype using STM32F407 discovery controller board is performed to verify the simulation results.
本文提出了一种基于新型紧凑U单元（PUC）的多电平并网逆变器。与由两个功率开关和一个电容器组成的U单元结构不同，在所提出的变换器拓扑中，来自光伏阵列（PV）等可再生能源的较低直流电源被用作基础电源。所提出的拓扑使用少量功率开关和由可再生能源提供的较低直流电源，从而具有更高的效率和更低的成本。其他电容器电压通过隔离式DC-DC功率变换器从基础较低直流电源中提取。从理论上分析了所提出的无变压器多电平并网逆变器的工作原理。通过仿真研究验证了所提出的多电平并网逆变器的运行情况。使用STM32F407探索者控制器板制作了一个实验原型，以验证仿真结果。
