电工技术学报2018，Vol.33Issue(1)：26-37,12.DOI:10.19595/j.cnki.1000-6753.tces.160370
新型非隔离型三相三电平光伏并网逆变器及其漏电流抑制研究
Research on Leakage Current Suppression of Novel Three-Phase Three-Level Non-Isolated PV Inverter
摘要
Abstract
A novel three-phase three-level non-isolated PV inverter is proposed in this paper based on the neutral-point-clamped (NPC) inverter. The characteristics of working states and leakage current were studied. Different from the NPC inverter, the topology of proposed inverter is so brief and it only consists of twelve switches and two DC capacitors without extra devices, such as six clamped diodes for the NPC. In order to suppress the leakage current, the relationship between the switch states and the common-mode voltage was analyzed and a novel Single-Carrier modulation was proposed based on the traditional modulation for two-level inverters. Finally, in order to verify the effectiveness of the proposed circuit and modulation strategy, the simulations and the experiments connected to the grid, inductance experiments were conducted. The results of the simulations and experiments confirm that the proposed topology is feasibility and the modulation is effective.关键词
光伏逆变器/三电平逆变器/非隔离型/共模电压/漏电流Key words
Photovoltaic inverter/three-level inverter/non-isolated/common mode voltage/leakage current分类
信息技术与安全科学引用本文复制引用
郭小强,朱铁影..新型非隔离型三相三电平光伏并网逆变器及其漏电流抑制研究[J].电工技术学报,2018,33(1):26-37,12.基金项目
国家自然科学基金(51677161,51307149)和河北省杰出青年基金(E2016203133)资助项目. （51677161,51307149）
