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Leakage Current Attenuation of a Three-Phase Cascaded Inverter for Transformerless Grid-Connected PV Systems

机译:无变压器并网光伏系统的三相级联逆变器的漏电流衰减

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摘要

Three-phase cascaded inverter with leakage current reduction for the transformerless PV system is investigated in this paper. The common-mode loop model of the conventional three-phase cascaded H4 grid-connected inverter is established. The relationship among the leakage current, common-mode voltage, and differential mode voltage is analyzed. The inherent reason that the conventional cascaded H4 grid-connected inverter fails to reduce the leakage current is clarified. In order to solve the problem, a novel three-phase cascaded H5 grid-connected inverter and its modulation strategy are proposed. It can significantly reduce the leakage current. Finally, the performance tests of the cascaded H4 and H5 grid-connected inverters are carried out. The results verify the effectiveness of the proposed solution.
机译:本文研究了用于无变压器光伏系统的降低漏电流的三相级联逆变器。建立了常规三相H4并网逆变器的共模环路模型。分析了泄漏电流,共模电压和差模电压之间的关系。阐明了传统的串联H4并网逆变器无法降低泄漏电流的内在原因。为了解决该问题,提出了一种新型的三相级联H5并网逆变器及其调制策略。它可以大大减少泄漏电流。最后,对级联的H4和H5并网逆变器进行了性能测试。结果验证了所提出解决方案的有效性。

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