电力系统自动化Issue(8)：91-97,7.DOI:10.7500/AEPS20130625004
一种高效率低输入纹波电流的光伏并网微逆变器
A High Efficiency Photovoltaic Grid-connected Micro-inverter with Low Input Current Ripple
摘要
Abstract
As the traditional photovoltaic inverter system has problems like hot spot,low efficiency and so on,a high-efficiency,low input current ripple of isolated single-phase two-stage photovoltaic grid-connected micro-inverter is proposed.It is composed of two stages:the first stage is the DC/DC boosted link,and the second stage the inverter link.Based on the principle of active clamp and voltage double rectifier,this micro-inverter realizes soft switching on both the transformer primary side switch tube and secondary side rectifier diode,analyses the principle of working in the steady state and gives the key waves of the converter.In the inverter link stage,soft phase-locked and pulse width modulation(PWM)are applied to achieving grid-connection.This paper also presents a new low-cost method by incorporating a ripple cancellation duty ratio in the control duty ratio of the DC/DC converter to reduce the AC ripple current with double output frequency existing on the DC input side of the boost-buck converter.A 220 W photovoltaic micro-inverter prototype is developed and tested,the experimental results have verified the feasibility of the analysis.关键词
光伏/微逆变器/软开关/低频电流纹波/软件锁相Key words
photovoltaic/micro-inverter/soft switching/low-frequency current ripple/soft phase-locked引用本文复制引用
魏少翀,张广明,嵇保健,王建华..一种高效率低输入纹波电流的光伏并网微逆变器[J].电力系统自动化,2014,(8):91-97,7.基金项目
国家自然科学基金资助项目(51207023) （51207023）
江苏省高校自然科学基金资助项目(2KJB470009) （2KJB470009）
教育部博士点基金资助项目(20120092120051) （20120092120051）
江苏省科技支撑计划---工业部分资助项目(BE2011188)。@@@@This work is supported by National Natural Science Foundation of China(No.51207023),Natural Science Foundation of the Jiangsu Higher Education Institutions of China (No.2KJB470009) and Ph.D.Programs Foundation of Ministry of Education of China(No.20120092120051) （BE2011188）
