基于低频中点钳位单元的非隔离型并网逆变拓扑  

A Novel Active Clamped Non-isolated PV Grid-Connected Inverter

作　　者：孙慕文 赵晋斌[1] 屈克庆[1] 

机构地区：[1]上海电力学院电气工程学院,上海市杨浦区200090

出　　处：《电网技术》2016年第12期3938-3944,共7页Power System Technology

基　　金：上海市自然科学基金项目(16ZR1413000);上海绿色能源并网工程技术研究中心(13DZ2251900)~~

摘　　要：为解决非隔离型单相全桥逆变拓扑存在的漏电流问题。提出一种由开关管和二极管组成的新中点钳位(neutral point clamped,NPC)单元及由此单元构成的新型逆变拓扑。该单元在入网电流的正半周只流过正方向的续流电流,在入网电流的负半周只流过反方向的续流电流,钳位开关低频工作的条件下,使续流回路的电位可以稳定保持在输入分裂电容中点电位,保持共模电压恒定不变,理论上减少漏电流。以基于此单元的NH8拓扑为例详细介绍了中点钳位非隔离逆变器拓扑的构成方法及其工作原理分析,最后通过Matlab/Simulink仿真和实验结果验证,证明了该拓扑的可行性和理论分析的正确性。In order to solve problem of leakage current in non-isolated single-phase full-bridge inverter topology, this paper proposes a neutral point clamped unit composed of switches and diodes to build a novel topology. This unit can only flow positive freewheeling current in positive half period, and flow negative freewheeling current in negative half period. Then, freewheeling loop potential can be kept constant, so common mode voltage can also be held stable, and leakage current can be reduced. Operation principle and method of NH8 topology construction based on the novel unit are analyzed. Finally, NH8 viability is confirmed with simulation（Matlab/Simulink） and experiments.

关 键 词：续流回路 中点钳位 无变压器型逆变器 漏电流 共模电压 

分 类 号：TM721[电气工程—电力系统及自动化]