Hosseinpour Majid, Noori Meysam, Shahparasti Mahdi
Department of Electrical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran.
School of Technology and Innovations, University of Vaasa, Vaasa, Finland.
Sci Rep. 2024 Jun 22;14(1):14411. doi: 10.1038/s41598-024-65211-0.
This paper presents a new structure for switched-capacitor multilevel inverter with octuple voltage gain capability. The proposed inverter utilizes three capacitors, 13 semiconductor switches, three diodes, and an input voltage source to achieve a 17-level output voltage. The switched capacitors naturally achieve voltage balancing without the need for sensors or additional circuits, indicating the ease of control of the proposed structure. To control the inrush current of the switched capacitors, a charge limiting inductor has been utilized in the charging path of the capacitors. This not only reduces the inrush current of the capacitors and the input source current but also enables faster capacitor charging and extends their lifetime. The switches used in the proposed structure can withstand a maximum of 4 times the input voltage value or the half of the maximum output voltage, which is a significant advantage for the proposed structure. A detailed comparison with similar structures is provided to examine the advantages and disadvantages of the suggested inverter. The procedure of self-voltage balancing of the capacitors and the functional modes of the proposed topology has been explained in detail. The proposed structure is suitable for applications such as renewable energy sources transfer to load or grid. The performance of the proposed topology under different conditions is confirmed through simulation in the Matlab\Simulink software and the implementation of the laboratory sample.
本文提出了一种具有八倍电压增益能力的开关电容多电平逆变器的新结构。所提出的逆变器利用三个电容器、13个半导体开关、三个二极管和一个输入电压源来实现17电平的输出电压。开关电容自然实现电压平衡，无需传感器或额外电路，这表明所提出结构易于控制。为了控制开关电容的浪涌电流，在电容器的充电路径中使用了一个限流电感。这不仅降低了电容器的浪涌电流和输入源电流，还能使电容器更快充电并延长其寿命。所提出结构中使用的开关最多可承受4倍的输入电压值或最大输出电压的一半，这是所提出结构的一个显著优势。提供了与类似结构的详细比较，以研究该逆变器的优缺点。详细解释了电容器的自电压平衡过程和所提出拓扑的功能模式。所提出的结构适用于可再生能源向负载或电网传输等应用。通过在Matlab\Simulink软件中进行仿真以及实验室样品的实现，证实了所提出拓扑在不同条件下的性能。
