M Jagabar Sathik, Almakhles Dhafer J
Renewable Energy Lab, College of Engineering, Prince Sultan University, Riyadh, Saudi Arabia.
Sci Rep. 2021 Nov 18;11(1):22487. doi: 10.1038/s41598-021-01669-6.
Developing of new photovoltaic inverter topologies is received more attention in the last few years. In particular, designing an active neutral-point-clamping inverter type structure is quite popular for PV applications. The output voltage is always half of the input voltage (v), which further increases the voltage rating of dc-link capacitors in the conventional three-level ANPC. To rectify the above problem and increase the output voltage by reducing dc-link capacitors voltage rating, a new boost type seven-level ANPC inverter topology is proposed. The proposed topology consists of seven switches and one floating capacitor. The floating capacitor voltage is self-balanced, and the output voltage is 1.5 times higher than the input voltage. A detailed comparison for some power components, power loss and cost with other existing topologies are presented. Further, the proposed topology is validated in a prototype hardware setup for different load values.
在过去几年中,新型光伏逆变器拓扑结构的开发受到了更多关注。特别是,设计一种有源中性点钳位逆变器类型的结构在光伏应用中非常流行。输出电压始终是输入电压(v)的一半,这进一步提高了传统三电平有源中性点钳位逆变器中直流母线电容的电压额定值。为了解决上述问题并通过降低直流母线电容电压额定值来提高输出电压,提出了一种新型升压型七电平有源中性点钳位逆变器拓扑结构。所提出的拓扑结构由七个开关和一个浮动电容组成。浮动电容电压是自平衡的,输出电压比输入电压高1.5倍。给出了与其他现有拓扑结构在一些功率元件、功率损耗和成本方面的详细比较。此外,所提出的拓扑结构在针对不同负载值的原型硬件设置中得到了验证。