A new non-isolated high-voltage gain single switch quadratic modified single-ended primary-inductor capacitor (SEPIC) DC–DC converter is proposed in this study. The proposed converter consists of a modified SEPIC converter along with a boosting module to obtain a high-voltage gain at a low-duty ratio. It has all advantages of the SEPIC converter such as continuous input current, which makes it applicable for renewable energy sources such as photovoltaic systems. The proposed converter is able to attain a higher voltage gain in comparison with similar previous transformer-less DC–DC converters. Also, unlike high-voltage transformer-based DC–DC converters, it does not suffer from leakage inductances. Also, the proposed converter presents low-voltage stress across the switch and output diode. The proposed converter is controlled through a single switch and there is no limitation for a range of duty ratios. The voltage gain analysis of the proposed converter is done in continuous conduction mode and discontinuous conduction mode, also comparative analysis is done with the existing topologies with similar features. The proposed converter is designed for 400 V DC microgrid applications. The theoretical analysis of the proposed converter is verified by the experimental investigation in the laboratory.

中文翻译：

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用于直流微电网应用的高升压单开关二次修正SEPIC转换器

这项研究提出了一种新的非隔离式高压增益单开关二次修正单端初级电感电容器（SEPIC）DC-DC转换器。拟议的转换器由改进的SEPIC转换器和升压模块组成，以低占空比获得高压增益。它具有SEPIC转换器的所有优点，例如连续输入电流，这使其适用于可再生能源，例如光伏系统。与以前类似的无变压器DC-DC转换器相比，该转换器能够获得更高的电压增益。而且，与基于高压变压器的DC-DC转换器不同，它没有泄漏电感。同样，提出的转换器在开关和输出二极管上也表现出低压应力。所提出的转换器通过单个开关控制，并且占空比范围不受限制。所提出的转换器的电压增益分析是在连续导通模式和不连续导通模式下进行的，还对具有相似特征的现有拓扑进行了比较分析。拟议的转换器专为400 V DC微电网应用而设计。拟议的转换器的理论分析已通过实验室的实验研究得到验证。