三电平四桥臂光伏逆变器漏电流抑制研究  

Research on Leakage Current Suppression for Three-level Four-leg PV Inverter

作　　者：王宝诚[1] 郭小强[1] 杨勇 贺冉[1] 贲冰 WANG Baocheng;GUO Xiaoqiang;YANG Yong;HE Ran;BEN Bing(Department of Electrical Engineering,Yanshan University,Qinhuangdao 066004,Hebei Province,China;Global Energy Interconnection Research Institute Co.,Ltd.,Changping District,Beijing 102209,China)

机构地区：[1]燕山大学电气工程学院,河北省秦皇岛市066004 [2]全球能源互联网研究院有限公司,北京市昌平区102209

出　　处：《中国电机工程学报》2018年第14期4194-4201,共8页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51777181);河北省引进留学人员资助项目(CL201622)~~

摘　　要：为了解决非隔离型光伏逆变器的漏电流问题,提出一种适用于三相三电平四桥臂逆变器的漏电流抑制方案。建立了三相三电平四桥臂逆变器系统的共模模型,分析了不同开关状态下共模电压的幅值及系统漏电流影响因素,进而提出一种基于双载波调制的新型载波调制策略。该调制可以实现共模电压恒定,从而有效抑制漏电流。最后,搭建了TMS320F28335DSP＋XC3S400FPGA数字控制硬件实验平台,对提出的新型载波调制进行了实验研究,实验结果验证了所提方案的有效性。In order to solve the problem of leakage current in the transformerlesss photovoltaic（PV） system, the leakage current reduction modulation technique for three-level four-leg inverter was proposed in this paper. The common mode loop model of the transformerless three-level four-leg inverter was presented firstly. Then the common mode voltage（CMV） with different switching states and the effect of factors on the leakage current were analyzed. A new modulation strategy based on double-carrier modulation was proposed. This new method can achieve constant CMV, thus leakage current can be eliminated. Finally, the proposed modulation was carried out on the TMS320 F28335 DSP＋XC3400 FPGA digital control hardware platform. The results are conducted to verify the effectiveness of the proposed modulation strategy.

关 键 词：光伏系统 三电平逆变器 三相四桥臂逆变器 漏电流 

分 类 号：TM46[电气工程—电器]