Study on SEPIC expandable step-up DC-DC converter

被引：0
|
作者：
Li J. [1 ]
Yan P. [2 ]
Wei Y. [1 ,3 ]
Li M. [1 ]
Wu X. [1 ]
机构：
[1] College of Electrical Engineering & New Energy, China Three Gorges University, Yichang
[2] The 710th Research Institute, China State Shipbuilding Corporation Ltd., Yichang
[3] Hubei Provincial Engineering Research Center of Intelligent Energy Technology, China Three Gorges University, Yichang
来源：
Dianji yu Kongzhi Xuebao/Electric Machines and Control | 2023年 / 27卷 / 04期
关键词：
low voltage stress; non-isolated; photovoltaic power generation; SEPIC converter; step-up;
D O I：
10.15938/j.emc.2023.04.007
中图分类号：
学科分类号：
摘要：
A non-isolated step-up DC-DC converter is proposed to address the voltage level mismatch between the output voltage of solar PV panels and the DC bus voltage in a multi-string grid-connected PV power generation system. A switched-capacitor network is introduced based on the conventional SEPIC converter to achieve high voltage gain by superimposing multiple capacitor voltages, while also reducing the input current ripple and obtaining lower voltage stress on semiconductor devices. The operation principle, voltage gain, and semiconductor device voltage and current stress of the converter in continuous and discontinuous conduction modes were analyzed in detail. In addition, the effect of the continuous conduction mode on the voltage gain of the converter was investigated without and with parasitic components. The performance advantages of the converter were highlighted by comparing it with the other six boost converters. Finally, a 200 W experimental prototype was built for verification, and the experimental results show the correctness and feasibility of the proposed converter. © 2023 Editorial Department of Electric Machines and Control. All rights reserved.
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页码：64 / 74
页数：10
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