三相级联型光伏并网逆变器漏电流抑制研究  

Leakage Current Reduction of Three-phase Cascaded PV Grid-connected Inverter

作　　者：郭小强[1] 周佳乐 贾晓瑜[1] 贺冉[1] GUO Xiaoqiang;ZHOU Jiale;JIA Xiaoyu;HE Ran(Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province (Yanshan University), Qinhuangdao 066004,Hebei Province,China)

机构地区：[1]电力电子节能与传动控制河北省重点实验室(燕山大学),河北省秦皇岛市066004

出　　处：《中国电机工程学报》2019年第2期594-603,共10页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51777181);河北省杰出青年基金项目(E2016203133)~~

摘　　要：针对级联型光伏并网逆变器,首先建立了传统三相级联H4光伏并网逆变器拓扑的系统共模模型,分析了系统漏电流、系统共模电压、差模电压三者之间的关系,揭示了传统三相级联H4光伏并网逆变器无法抑制漏电流的原因。提出了一种新型三相级联H5光伏并网逆变器拓扑及其调制策略,有效地抑制了系统漏电流。最后,与三相级联H4光伏并网逆变器拓扑进行了性能对比研究,结果验证了所提方案的有效性。Three-phase cascaded three-level PV grid-connected inverter was investigated in this paper. The common mode model of the conventional three-phase cascaded H4 grid-connected inverter topology was established. The relationship among the leakage current, common mode voltage and differential mode voltage was analyzed. The inherent reason that the conventional cascaded H4 grid-connected inverter topology failed to reduce the leakage current was clarified. A new three-phase cascaded H5 grid-connected inverter topology and its modulation strategy were proposed. It was able to significantly reduce the leakage current. Finally, the performance tests of the cascaded H4 and H5 grid-connected inverter topologies were carried out. The results verified the effectiveness of the proposed solution.

关 键 词：非隔离型光伏系统 级联型并网逆变器 共模电压 漏电流 

分 类 号：TM46[电气工程—电器]