Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 33, Issue 3, Pages 2127-2135Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2017.2692753
Keywords
Leakage current; pulse width modulation (PWM); three-phase flying capacitor (FC) photovoltaic (PV) inverter; transformerless PV system
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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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Flying capacitor photovoltaic (PV) inverters have been widely discussed in the literature. However, the relevant leakage current issues have not received much attention. In this paper, the modulation techniques for a transformerless three-phase flying capacitor PV inverter are investigated for the leakage current suppression. First, the theoretical analysis of the system common mode model and leakage current is presented. Second, three kinds of conventional carrier-based modulation techniques are evaluated, and results indicate that they fail to effectively suppress the leakage current. Third, a new carrier modulation and logic function is presented. It is able to maintain the constant commonmode voltage, and consequently, the leakage current can be significantly reduced. Finally, the experimental tests are conducted on a transformerless three-phase flying capacitor PV inverter to verify the effectiveness of the proposed method.
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