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http://dx.doi.org/10.7471/ikeee.2022.26.4.584

A High-efficiency Single-phase Photovoltaic Inverter for High-voltage Photovoltaic Panels  

Hyung-Min, Ryu (Dept. of Electrical Engineering, Dong-eui University)
Publication Information
Journal of IKEEE / v.26, no.4, 2022 , pp. 584-589 More about this Journal
Abstract
For DC-AC power conversion from a high-voltage photovoltaic panel to a single-phase grid, the two-stage transformerless inverter with a buck-boost converter followed by a full-bridge inverter is widely used. To avoid an excessive leakage current due to the large parasitic capacitance of the photovoltaic panel, the full-bridge inverter can only adopt the bipolar PWM which results in much higher power loss compared to the unipolar PWM. In order to overcome such a poor efficiency, this paper proposes a new topology in which an IGBT and a diode for circuit isolation are added to the buck-boost converter. The proposed circuit isolation method allows the unipolar PWM in the full-bridge inverter without any increase in the leakage current so that the overall efficiency can be improved. The validity of the proposed solution is verified by computer simulation and power loss calculation.
Keywords
high-efficiency; single-phase photovoltaic inverter; buck-boost converter; full-bridge inverter; leakage current;
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