Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 65, Issue 1, Pages 676-686Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2017.2733427
Keywords
Cascaded grid-connected inverter; common-mode voltage (CMV); leakage current; trans-formerless photovoltaic (PV) inverter
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Funding
- National Natural Science Foundation of China [51677161]
- Science Foundation for Distinguished Young Scholars of Hebei Province [E2016203133]
- Hundred Excellent Innovation Talents Support Program of Hebei Province [SLRC2017059]
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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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