Saif Bisma, Sarwar Adil, Ahmad Shafiq, Lu Shiue-Der, Liu Hwa-Dong
Department of Electrical Engineering, ZHCET, Aligarh Muslim University, Aligarh, 202002, India.
Industrial Engineering Department, College of Engineering, King Saud University, 11421, Riyadh, Saudi Arabia.
Sci Rep. 2025 Feb 4;15(1):4209. doi: 10.1038/s41598-025-86180-y.
Lately, transformer-less Researchers in the fields of power electronics and renewable energy have taken notice of photovoltaic inverters because of their great efficiency, low cost, and small size. However, higher efficiency typically results in more components, making the inverter costly and bulky. This article proposes a single-phase seven-level transformer-less with common ground topology. The proposed topology utilizes 10 switches, 4 capacitors and 1 diode. This article also suggests an improved Phase Shift (PS) Modulation Technique which reduces overall losses. When implemented with improved Phase Shift (PS), the total highest attainable efficiency of the proposed topology is 98.05% at 15 W. The THD% of voltage harmonics is reduced to 15.29% from 17.20% and for current harmonics is reduced to 5.07% from 10.15%. The reliability of the proposed inverter has also been analyzed. The simulation as well as hardware results have been presented to validate the performance of the proposed inverter.
最近，电力电子和可再生能源领域中无变压器的研究人员已经注意到光伏逆变器，因为它们具有高效率、低成本和小尺寸的特点。然而，更高的效率通常会导致更多的元件，从而使逆变器成本高昂且体积庞大。本文提出了一种具有公共接地拓扑的单相七电平无变压器逆变器。所提出的拓扑使用10个开关、4个电容器和1个二极管。本文还提出了一种改进的移相（PS）调制技术，该技术可降低总体损耗。当采用改进的移相（PS）技术时，所提出拓扑在15W时的最高可实现总效率为98.05%。电压谐波的总谐波失真（THD%）从17.20%降至15.29%，电流谐波的总谐波失真从10.15%降至5.07%。本文还分析了所提出逆变器的可靠性。给出了仿真和硬件结果以验证所提出逆变器的性能。
