摘要
共模漏电流抑制是非隔离型光伏并网系统需要解决的关键问题。首先建立传统非隔离型级联H桥光伏并网系统共模模型,推导出系统共模漏电流数学表达式,分析影响系统共模漏电流的主要因素,指出传统级联H桥逆变器无法抑制共模漏电流的原因。然后提出一种级联H5逆变器拓扑及其调制策略,有效地抑制了系统共模漏电流。最后搭建数字控制实验样机系统,对级联H4拓扑和级联H5拓扑进行对比实验,实验结果验证了所提方案的有效性。
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.
出处
《电工技术学报》
EI
CSCD
北大核心
2018年第2期361-369,共9页
Transactions of China Electrotechnical Society
基金
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)
河北省引进留学人员项目(CL201622)资助
关键词
非隔离光伏系统
级联H桥逆变器
共模漏电流
Transformerlesss PV system, cascaded H-bridge inverter, common-mode leakage current
