电工技术学报2018，Vol.33Issue(2)：361-369,9.DOI:10.19595/j.cnki.1000-6753.tces.151964
非隔离型级联H5光伏逆变器共模漏电流特性分析
Analysis of Common Mode Leakage Current for Transformerless Cascaded H5 PV Inverter
摘要
Abstract
The suppression of common mode current is a key technical issue in transformerless photovoltaic (PV) system. Firstly, the common mode model of the conventional transformerless grid-connected cascaded H-bridge PV system is established. The mathematical expression of the common mode current is derived. The major factors that affect the common mode current are discussed. The reason that the conventional cascaded H-bridge inverter fails to reduce the common mode current is explained. Secondly, a new cascaded H5 topology and its modulation strategy are proposed to solve the common mode current issue. Finally, a prototype with digital control is built. The experiment tests of cascaded H4 and H5 topologies are carried out. The experimental results verify the effectiveness of the proposed solution.关键词
非隔离光伏系统/级联H桥逆变器/共模漏电流Key words
Transformerlesss PV system/cascaded H-bridge inverter/common-mode leakage current分类
信息技术与安全科学引用本文复制引用
郭小强,贾晓瑜..非隔离型级联H5光伏逆变器共模漏电流特性分析[J].电工技术学报,2018,33(2):361-369,9.基金项目
河北省杰出青年基金(E2016203133),河北省高校百名优秀创新人才支持计划( SLRC2017059 )和河北省引进留学人员项目(CL201622)资助. （E2016203133）
