Comparison of Leakage Current in Various Photovoltaic Inverter Topologies

태양광 인버터 회로구조에 따른 누설전류 비교

In low-power grid-connected photovoltaic(PV) system, Single-phase transformerless full-bridge inverter is commonly used. However in transformerless photovoltaic application, the ground parasitic capacitance created by grounding between PV panels and ground. This ground parasitic capacitance inject additional current into the inverter, these currents cause electromagnetic interference problem, safety problem and harmonics problem in PV applications. In order to eliminate the ground current, This paper propose various inverter topologies in PV applications. These proposed inverter topologies are verified through simulation using PSIM.