电流型降压桥式伪直流环节微逆变器  

Pseudo DC Link Micro-Inverter Based on Current-Fed Buck-Type Full-Bridge Topology

作　　者：阚加荣[1] 吴云亚[1] 谢少军[2] 汤雨[2] 薛迎成[1] 

机构地区：[1]盐城工学院电气工程学院,江苏省盐城市224051 [2]江苏省新能源发电与电能变换重点实验室(南京航空航天大学),江苏省南京市210016

出　　处：《电网技术》2017年第1期99-105,共7页Power System Technology

基　　金：国家自然科学基金项目(51577164;51477077;51677084)~~

摘　　要：随着单块光伏电池输出功率越来越高,以反激电路为基础的传统光伏微逆变器难以达到高效率,因此桥式电路为基础的微逆变器越来越受到重视。提出一种电流型降压桥式伪直流环节微逆变器。推导了能量缓冲电感的选择方法,得到了其中各开关器件的电流应力。对所提微逆变器与传统反激式微逆变器在开关管的导通损耗、二极管的导通损耗、伪直流环节滤波效果、开关损耗方面做了详细比较,所提微逆变器综合新能优于传统微逆变器。200 W样机的实验结果证明所提微逆变器性能优良。With continuous increase of rated power of photovoltaic cells, conventional micro-inverter based on simple flyback topology cannot realize high conversion efficiency. Thus, micro-inverter based on full-bridge topology attracts more and more attention. This paper proposed a current-fed buck-type full-bridge pseudo DC link micro-inverter. Design principle of energy buffer inductor was derived and switch current stress was obtained. Compared with conventional micro-inverter, comprehensive performance of the proposed micro-inverter is remarkably improved. These performance factors comprise conduction loss of switches and diodes, ripple in pseudo DC link voltage, switching loss, etc. Experimental results of 200 W prototype verify validity of theoretical analysis.

关 键 词：微逆变器 伪直流环节 电流型 降压桥式 移相控制 电流应力 

分 类 号：TM72[电气工程—电力系统及自动化]