摘要
针对温差发电模块输出电压宽范围变化并要求电流纹波小的特点,提出一种耦合电感双输入升降压变换器。其前端为两个Boost单元并联实现双输入,再级联Buck单元实现升降压;Boost与Buck电感反向耦合,减少了磁心数目,并且磁心直流磁通相互抵消,减小了磁心体积和损耗,大大提高了变换效率和功率密度;提出了相应的控制和调制策略以实现分布式MPPT及宽输入电压范围各种工作模态间的平滑切换。详细分析了变换器工作原理和耦合电感特性,搭建了一台450W实验样机,验证了理论分析的正确性和可实现性。
A double-input Boost-Buck converter with coupled inductors(DIBBC-CI) is proposed for thermoelectric generator(TEG) power system, where the converter is desired to interface the TEG with low current ripple under wide input voltage range. The DIBBC-CI is built with two Boost converters and a Buck converter cascaded, sharing the inverse coupled filter inductors. Benefiting from the DC magnetic flux counteract, reduced size and power loss of the filter are achieved. The MPPT/ constant voltage/constant current control strategy for free and seamless mode transient and distributed maximum power point tracking(DMPPT) are also proposed. The operational principle, the influence of coupled inductor and its design considerations are analyzed in detail. A 450 W prototype is built with experimental results to verify the analysis.
出处
《电工技术学报》
EI
CSCD
北大核心
2015年第1期143-149,共7页
Transactions of China Electrotechnical Society
基金
国家自然科学基金项目(51377083)
清华大学电力系统及发电设备控制和仿真国家重点实验室课题(SKLD12KM04)
江苏省高校优秀科技创新团队
江苏省新能源发电与电能变换重点实验室开放研究基金资助项目
关键词
双输入
升降压变换
耦合电感
分布式最大功率点跟踪
Double-input,step-up/-down,coupled inductors,distributed maximum power point tracking(DMPPT)
