Integration of significant amount of solar power, challenges the power system stability operation. Also power quality issue such as total harmonic distortion (THD) has become an increasingly serious concern as more photovoltaic cells (PV) are integrated into the grid system. This paper deals with the analysis on voltage stability and THD at the point of common coupling of a gridconnected PV system. The proposed configuration not only generates and boosts up the dc voltage, but can also convert the solar dc power into high quality ac power by means of a PWM inverter. Further, a transient current limiter (TCL) circuit has been employed here for power quality improvement as well as to ascertain the absolute stability of the overall interconnected system. Simulation and experimental results are shown for voltage and current during synchronization mode to validate the methodology for grid connection of renewable resources.

Keywords: Grid-connected, Photovoltaic (PV), Boost converter, PWM inverter, Transient current limiter (TCL), Stability analysis, Total harmonic distortion (THD)