Three-phase DC-bypass topologies with reduced leakage current for transformerless PV systems
Three-phase DC-bypass topologies with reduced leakage current for transformerless PV systems
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DOI：
10.1109/ecce.2015.7309667
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发表时间：
2015-10
期刊：
影响因子：
--
通讯作者：
Xiaoqiang Guo;David Xu;Bin Wu
中科院分区：
文献类型：
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作者：
Xiaoqiang Guo;David Xu;Bin Wu
减少漏电流是无变压器光伏并网逆变器最重要的问题之一。据报道，许多有趣的单相拓扑可以减少漏电流。然而，具有降低漏电流的三相光伏逆变器拓扑并没有受到太多关注。本文提出了一种新的三相拓扑系列，以减少无变压器光伏系统的漏电流。它源自单相直流旁路拓扑，并提出了一种新的调制来协调直流旁路开关和 H 桥开关。进行理论分析和性能测试以验证所提出拓扑的有效性。
Leakage current reduction is one of the most important issues for transformerless PV grid-connected inverters. Many interesting single-phase topologies have been reported to reduce the leakage currents. However, three-phase PV inverter topologies with reduced leakage currents are not received much attention. In this paper, a new family of three-phase topology is proposed to reduce the leakage current for transformerless PV systems. It derives from the single-phase dc-bypass topologies, and a new modulation is presented to coordinate the dc-bypass switches and H-bridge switches. Theoretical analysis and performance tests are carried out to verify the effectiveness of the proposed topology.