一种零电压转换H6结构非隔离光伏并网逆变器  

A Zero-Voltage-Transition H6 Type Transformerless PV Grid-Connected Inverter

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3期363-370,共8页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51207024);江苏省自然科学基金(BK20131292);教育部博士点基金(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。提出一种零电压转换H6结构非隔离光伏并网逆变器,通过引入两组谐振支路可实现高频主开关的零电压开通和零电压关断,高频辅助开关管的零电流开通,及续流二极管的零电压开通和零电压关断。论文详细分析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100kHz、1kW样机验证新型逆变器的可行性。The low leakage current and high efficiency are two key indexes for transformerless PV grid-connected inverters. The transformerless inverter has superior efficiency thanks to saving the transformer, but its switches work at the hard-switching state at present. This paper presents a new zero-voltage-transition H6 type transformerless PV grid- connected inverter. By introducing two resonant tanks into conventional H6 topology, the zero-voltage turn-on and turn-off for the high frequency main switches, the zero-current turn-on for the auxiliary switches, and the zero-voltage turn-on and turn-off for the freewheeling diodes are achieved. The operation principle, soft-switching conditions, duty cycle restrict, and resonant tank parameter design rule are analyzed in detail. Finally, the validity of the zero-voltage-transition full bridge inverter is verified by a universal prototype rated at 100kHz, 1 kW.

关 键 词：并网逆变器 非隔离 零电压开通 谐振 

分 类 号：TM85[电气工程—高电压与绝缘技术]