一种基于DCM单元的高升压非隔离型DC/DC变换器  

High-boost Non-isolated DC/DC Converter Based on DCM Unit

作　　者：丁峰 王辉[1] 李圣乾 杨剑 王寒 DING Feng;WANG hui;LI Shengqian;YANG jian;WANG Han(College of Electrical Engineering&New Energy,China Three Gorges University,Yichang,Hubei 443002,China)

机构地区：[1]三峡大学电气与新能源学院

出　　处：《广东电力》2020年第1期43-52,共10页Guangdong Electric Power

基　　金：湖北省微电网工程技术研究中心开放基金项目(2015KDW05)

摘　　要：为解决光伏发电系统中现有DC/DC变换器升压能力低、器件应力高的问题,提出一种高升压非隔离型DC/DC变换器。该变换器采用二极管电容倍增器(diode-capacitor multiplier,DCM)升压单元来提高变换器输入、输出电压增益,并通过DCM单元中电容的安秒平衡实现输入相的自动均流。对该变换器进行性能分析、仿真验证以及关键参数计算,并依据关键参数设计了额定功率为300 W的实验样机。实验结果表明该变换器具有以下优点:输入、输出增益高且可调节,适用于对增益要求不同的场合;器件应力低,方便选型,同时提高了变换器工作效率;输入相实现了自动均流,简化了控制策略。损耗分析结果表明,该变换器的理论效率在额定工况下达到93.6%。To solve the problems of low boost and high device stress of current DC/DC converters in the photovoltaic generation system,this paper proposes a kind of DC/DC converter with high boost ability and low device stress which uses the diode-capacitor multiplier(DCM)boosting unit to improve input and output voltage gains of the converter,and could realize automatic current-sharing of the input phase through ampere-second balance of the capacitance in the DCM unit.The paper makes performance analysis,simulation verification and calculation on the key parameters for the converter,and designs an experimental prototype with rated power 300 W according to the key parameters.The experimental results indicate this converter has many advantages including high and adjustable input and output gains for those occasions required for different gain demands.Low device stress of the converter is convenient for type selection and feasible in improving working efficiency.The input phase can realize automatic current-sharing and simplify the control strategy.Power loss analysis shows the theoretical efficiency of the converter reaches 93.6%under the rated working condition.

关 键 词：光伏发电 DC/DC变换器 高增益 低器件应力 自动均流 DCM单元 

分 类 号：TM46[电气工程—电器]