基于SEPIC的新型高增益DC-DC变换器及衍生拓扑分析  

Analysis of Novel High-gain DC-DC Converter Based on SEPIC and Derived Topologies

作　　者：魏业文[1,2] 李明 李俊波 宁鑫淼 白文静 WEI Yewen;LI Ming;LI Junbo;NING Xinmiao;BAI Wenjing(College of Electrical Engineering&New Energy,China Three Gorges University,Yichang 443002,China;Hubei Provincial Engineering Research Center of Intelligent Energy Technology,China Three Gorges University,Yichang 443002,China)

机构地区：[1]三峡大学电气与新能源学院,宜昌443002 [2]三峡大学智慧能源技术湖北省工程研究中心,宜昌443002

出　　处：《电力系统及其自动化学报》2024年第4期19-29,共11页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金青年基金资助项目(52107108);智慧能源技术湖北省工程研究中心开放课题(2020ZHLY06)。

摘　　要：针对光伏并网系统中单开关升压变换器(如SEPIC、Boost、准Z源、二次型)电压增益低和半导体器件电压应力大的问题,提出1种基于SEPIC的外部升压型高增益DC-DC变换器。首先对所提变换器在电感电流连续导通模式和断续导通模式下的工作原理和稳态特性进行详细分析,并与其他新型拓扑进行性能对比。在此基础上,给出了基于外部升压网络的衍生拓扑。最后,通过搭建1台400 V/200 W的实验样机证明了理论分析的准确性。所提变换器利用阻抗网络和开关电容单元构成的外部升压网络提升了SEPIC变换器的电压增益,并改善了半导体器件电压应力大的缺点。In response to the problems of low voltage gain and high voltage stress in semiconductor devices existing in single-switch Boost converters utilized in grid-connected photovoltaic systems,such as a single ended primary inductor converter(SEPIC),Boost,quasi-Z-source,and second-order converters,an external Boost high-gain DC-DC converter based on the SEPIC topology is proposed.First,a detailed analysis of the working principle and steady-state characteristics of the proposed converter is conducted in both the continuous and discontinuous conduction modes of inductor current,and its performance is compared with those of other emerging topologies.On this basis,the derived topologies based on the external Boost network are given.Finally,the theoretical analysis is validated through the construction of a 400 V/200 W prototype.The proposed converter utilizes an external Boost network composed of impedance network and switched capacitor units to step up the voltage gain of the SEPIC converter while remedying the drawbacks associated with the high voltage stress in semiconductor devices.

关 键 词：DC-DC变换器 单端初级电感变换器 高增益 低电压应力 非隔离 

分 类 号：TM46[电气工程—电器]