一种零电流转换H6结构非隔离光伏并网逆变器  

Zero-current-transition H6 Type Transformerless PV Grid-connected Inverters

作　　者：肖华锋[1] 刘隰蒲 兰科[1] 

机构地区：[1]东南大学电气工程学院,江苏省南京市210096

出　　处：《中国电机工程学报》2014年第1期32-39,共8页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51207024);教育部博士点基金项目(20120092120054)~~

摘　　要：非隔离型单相光伏并网逆变器的漏电流和效率是两个关键指标。非隔离型并网逆变器相比隔离型结构有效率优势,但到目前为止,非隔离型并网逆变器的高频开关仍然工作在硬开关状态。提出一种零电流转换H6结构非隔离光伏并网逆变器,通过引入两组谐振支路可以实现高频主开关的零电流关断,及高频辅助开关管的零电流开通。详细分析了新型逆变器的工作模态、软开关条件、占空比约束条件和谐振参数设计方法,并通过一台50?kHz、1?kW原理样机验证新型逆变器的可行性。Low leakage current and high efficiency are two key indexes for transformerless PV grid-connected inverter. The transformerless inverter has superior efficiency thanks to saving the transformer, but its switches work at hard-switching state at present. This paper presents a new zero-current- transition H6 type transformerless PV grid-connected inverter, the zero-current turn-off of the high frequency main switches, and the zero-current turn-on of the auxiliary switches are achieved by introducing two resonant tanks. The operation principle, soft-switching conditions, duty cycle restrict, and resonant tank parameters design rule are analyzed in detail. Finally, the validity of the zero-voltage-transition full bridge inverter is verified by a prototype rated at 50 kHz, 1 kW.

关 键 词：并网逆变器 非隔离 零电流关断 谐振 

分 类 号：TM46[电气工程—电器]