An Improved H5 Topology With Low Common-Mode Current for Transformerless PV Grid-Connected Inverter
An Improved H5 Topology With Low Common-Mode Current for Transformerless PV Grid-Connected Inverter
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DOI：
10.1109/tpel.2018.2833144
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发表时间：
2019-02
影响因子：
6.7
通讯作者：
Hong Li;Yangbin Zeng;Bo Zhang;T. Zheng;Ruixiang Hao;Zhichang Yang
中科院分区：
文献类型：
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作者：
Hong Li;Yangbin Zeng;Bo Zhang;T. Zheng;Ruixiang Hao;Zhichang Yang
无变压器光伏（PV）并网逆变器由于具有高效率、低成本和体积小的优势，在分布式光伏发电系统中越来越受欢迎。然而，无变压器光伏逆变器中的共模（CM）电流会导致严重的电磁干扰和不安全因素，这将进一步降低光伏逆变器系统的可靠性。本文提出了一种改进的H5拓扑结构，即H5 - D拓扑，它在H5拓扑的基础上增加了一个钳位二极管，以消除H5拓扑中的共模电压波动。此外，给出并比较了H5 - D拓扑和H5拓扑的PSIM仿真结果，特别是具体展示和分析了H5 - D拓扑对共模电流抑制的性能。最后，搭建并测试了H5 - D拓扑和H5拓扑的实验样机，实验结果验证了H5 - D拓扑的优势。所提出的H5 - D拓扑为分布式光伏并网发电系统提供了一种新的实用拓扑结构。
Transformerless photovoltaic (PV) grid-connected inverters have become more and more popular in distributed PV power generation systems due to the advantages on high efficiency, low cost, and small size. However, common-mode (CM) current in the transformerless PV inverters can result in serious electromagnetic interference and insecurity, which will further reduce the reliability of the PV inverter systems. In this paper, an improved H5 topology, namely H5-D topology, is proposed, in which a clamping diode is added on the basis of H5 topology to eliminate the CM voltage fluctuation in H5 topology. Further, the PSIM simulation results of the H5-D topology and H5 topology are given and compared, especially, the performance of H5-D topology for CM current suppression is presented and analyzed concretely. Finally, the experimental prototypes of the H5-D topology and H5 topology are built and tested, and the experimental results validate the advantages of the H5-D topology. The proposed H5-D topology provides a new practical topology for distributed PV grid-connected power generation systems.