电力系统及其自动化学报2019，Vol.31Issue(7)：30-35,6.DOI:10.19635/j.cnki.csu-epsa.000105
级联H桥光伏并网逆变器漏电流抑制调制策略
Modulation Strategy with Leakage Current Reduction for Cascaded H-bridge Photovoltaic Grid-connected Inverter
摘要
Abstract
An effective modulation strategy is proposed to solve the leakage current problem with the cascaded H-bridge photovoltaic(PV)grid-connected inverter. First,a common-mode equivalent model of cascaded H-bridge PV grid-con?nected inverter is established,and the main factors influencing the common-mode leakage current are analyzed. Then, a modified level-shifted pulse width modulation(MLS-PWM)strategy is proposed. By taking advantage of the influence of different switching states on the common-mode voltage of the system,the common-mode voltage is kept constant dur?ing the switching process. In this way,the leakage current problem of the system is solved. This method is simple in structure,and it can effectively reduce the common-mode leakage current. Finally,simulation results verify the effec?tiveness and correctness of the proposed method.关键词
级联H桥/光伏并网/漏电流/调制策略Key words
cascaded H-bridge/photovoltaic grid-connection/leakage current/modulation strategy分类
信息技术与安全科学引用本文复制引用
陈碧云,张福勇..级联H桥光伏并网逆变器漏电流抑制调制策略[J].电力系统及其自动化学报,2019,31(7):30-35,6.基金项目
国家自然科学基金资助项目(51437003) （51437003）
