阻抗源四桥臂光伏逆变器共模特性研究  

Common Mode Behavior for Z-Source Four-Leg Inverter

作　　者：王宝诚[1] 郭小强[1] 杨勇 贺冉[1] 伞国成[1] Wang Baocheng;Guo Xiaoqiang;Yang Yong;He Ran;San Guocheng(School of Electrical Engineering Yanshan University Qinhuangdao 066004 China)

机构地区：[1]燕山大学电气工程学院,秦皇岛066004

出　　处：《电工技术学报》2018年第24期5848-5855,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51777181)

摘　　要：以无变压器型Z源四桥臂光伏逆变器为研究对象,对系统共模特性进行分析。首先建立无变压器型Z源四桥臂光伏逆变器系统共模模型,分析不同开关状态下共模电压特性及系统共模漏电流的影响因素,在此基础上提出一种新型调制方案,该方案不仅具有升压功能,并且共模电压保持恒定,从而有效减小了系统漏电流。最后搭建实验平台,控制采用DSPTMS320F28335和赛灵思FPGA XC3S400控制电路实现,对提出的方案进行了实验验证,实验结果证明了提出方案的有效性。The common mode behavior analysis of transformerless Z-source three-phase four-leg phtotvolatic(PV)inverter is investigated in this paper.Firstly,the common mode loop model is presented.Secondly,the common mode voltage under different switching states and the effect factors regarding the leakage current are analyzed.Thereafter,a new modulation strategy is proposed.The proposed method can achieve boost function as well as constant common mode voltage.Meanwhile,the leakage current can be eliminated in an effective way.Finally,the proposed solution is carried out on the digital control hardware platform.The experimental results verify the effectiveness of the proposed solution.

关 键 词：无变压器型光伏系统 四桥臂逆变器 阻抗源逆变器 共模特性 

分 类 号：TM464[电气工程—电器]