一种改进型的单相无变压器型PV逆变器拓扑结构

摘要

The mechanism of common-mode current of transformerless photovoltaic grid systems was detailed analyzed,and detailed analysis and study of the single-phase full-bridge topology was given. On this basis, a new transformerless topology was proposed, and through theoretical analysis and simulation to verify the topology can effectively suppress common mode current. By comparison several existing topologies, the proposed topology can improve the efficiency of the system and have some practical value.%对无变压器型光伏并网系统的共模电流的产生机理进行了详细的分析,并详细地分析和研究了单相全桥拓扑结构.在此基础上提出了一种新的无变压器型拓扑结构,并通过理论分析和仿真研究验证了该拓扑可有效地抑制共模电流.通过和几种现有拓扑结构的比较,提出的改进型拓扑结构可提高系统效率,具有一定的工程实用价值.