一种新型的正激并网微逆变器  

A Novel Forward Grid-Connected Micro-inverter

作　　者：陈继洪[1] 洪峰[1] 

机构地区：[1]雷达成像与微波光子技术教育部重点实验室(南京航空航天大学),江苏南京210016

出　　处：《电工技术学报》2015年第14期286-294,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(50907033);江苏省科技支撑计划资助项目(BE2012170);江苏高校优势学科建设工程资助项目

摘　　要：反激并网微逆变器存在输出电流纹波较大、入网电流与电网电压有相位差和功率容量较小等问题。针对以上问题,本文提出了一种基于正激变换器的并网微逆变器拓扑结构及其控制策略。原边采用双管正激电路,减小了开关管的应力,同时实现了变压器的磁芯复位;引入LCD箝位电路,实现了原边开关管的软开关,提高了整机效率;输出滤波采用L滤波器,保证了入网电流与电网电压没有相位差。文中详细分析了该逆变器的工作原理,分析了入网电流的相位差,最后进行仿真和实验验证。Flyback grid-connected micro-inverter has the defects of larger current ripple, larger phase difference of grid-connected current and smaller output power. To solve these problems, A novel single-stage forward grid-connected micro-inverter topology and algorithm is proposed in this paper. The drain-source voltage of the switch is clamped and the core of Transformer is reset with the help of the two transistor forward circuit. A LCD clamping circuit was used to achieve zero voltage switching（ZVS） turning-on of the switch and increase efficiency of the inverter. A L filter was used in output, so the phase of grid-connected current is not different with grid voltage. In-depth analysis was given on the inverter principles and the phase difference of grid connected current. Finally, simulation results and experimental results were given.

关 键 词：正激 微逆变器 软开关 相位差 

分 类 号：TM315[电气工程—电机]