Leakage Current Analysis of Single Phase Photovoltaic Grid Tied Inverters

In domestic single phase grid connected PV applications; single phase converters are usually employed. In low power applications converter topologies without galvanic isolation can be adopted between PV panel and grid. On the other side in the presence of galvanic connection, ground leakage current could arise due to parasitic PV panel capacitance. In order to avoid these leakage current inverter topology with no varying common mode is required. This paper presents the converter topology to minimize the leakage current/common mode currents using unipolar sinusoidal pulse width modulation technique using MATLAB/SIMULINK. Keywords— Leakage current, common mode current, Photovoltaic system, unipolar sinusoidal PWM (UPSPWM)