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JPE, Vol. 18, No. 4, July 2018
Single-Phase Transformerless PV Power Conditioning Systems with Low Leakage Current and Active Power Decoupling Capability
Hoang Vu Nguyen, Do-Hyeon Park, and Dong-Choon Lee
Area Low Power Converters
Abstract This paper proposes a transformerless photovoltaic (PV) power converter system based on the DC/AC boost inverter, which can solve the leakage current and second-order ripple power issues in single-phase grid-connected PV inverters. In the proposed topology, the leakage current can be decreased remarkably since most of the common-mode currents flow through the output capacitor, by-passing parasitic capacitors, and grounding resistors. In addition, the inherent ripple power component in the single-phase grid inverter can be suppressed without adding any extra components. Therefore, bulky electrolytic capacitors can be replaced by small film capacitors. The effectiveness of the proposed topology has been verified by simulation and experimental results for a 1-kW PV PCS.
Keyword Active power decoupling,Boost inverter,Leakage reduction,PV inverter
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