IEEE Transactions on Industrial Electronics · 2017 · 101 citations · 31 references
EngineeringElectrical EngineeringPower ElectronicsRenewable Energy IntegrationRenewable Energy SystemsConverter TopologiesDc-ac InvertersDistributed Energy ResourcesPower Electronics For Renewable EnergyRenewable Energy Power ConversionSolar Photovoltaic SystemsCommon-mode Voltage ReductionGrid-connected InvertersGrid-connected Photovoltaic SystemsLeakage CurrentLeakage Current ReductionPhotovoltaic InvertersThree-phase InvertersThree-phase Power
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.
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