非隔离型单相光伏并网逆变器共模漏电流抑制方法研究  

SOLUTION OF RESTRAINING LEAKAGE CURRENT FOR SINGLE-PHASE NON-ISOLATED PV GRID-CONNECTED INVERTERS

作　　者：柳少良[1] 游小杰[1] 李艳[1] 张雅静[1] 王剑斌[1] 

机构地区：[1]北京交通大学电力电子研究所,北京100044

出　　处：《太阳能学报》2014年第12期2431-2437,共7页Acta Energiae Solaris Sinica

摘　　要：为了消除和抑制非隔离型单相光伏并网发电系统中存在的共模漏电流,首先以传统单相全桥逆变电路为研究对象,分析非隔离型单相光伏并网系统产生漏电流的原因,然后详细推导系统共模谐振电路等效模型,并对其进行频谱分析,最后提出抑制和消除共模漏电流的新方法,即在并网侧同时增加RC吸收支路和共模电感,并通过仿真和实验验证了该方法的正确性和可行性。In order to eliminate and suppress common-mode leakage current in non-isolated PV grid-connected power system, the full-bridge single-phase grid-connected inverter was researched. Firstly, the reasons for generating common- mode leakage current in non-isolated single-phase PV grid-connected power system were analyzed. Then the equivalent model of system common-mode resonant circuit was derived, and its spectral characteristics were analyzed. Finally, a new method of adding RC absorbing branches and common-mode inductance in the grid side simultaneously to eliminate and suppress common-mode leakage current was proposed. The simulation and experiment results show that the method is correct and feasible.

关 键 词：无变压器 光伏并网 逆变器 共模漏电流 谐振频率 

分 类 号：TM464[电气工程—电器]