photovoltaic

As more and more renewable energy resources are penetrating the distribution networks, there have been growing concerns regarding its adverse impacts on the integrated power system. Consequently, numerous research works are being focused on methods of mitigating issues such as reliability, low power quality, stability, etc. Here in this paper performance of multilevel inverter for the solar photovoltaic (PV) based standalone and grid-connected system has been enhanced. The inverter circuit has been tested for parameters like THD (Total Harmonics Distortion) and system efficiency for standalone systems having RL load being operated at different power factors. Then the same analysis has been done for a grid-connected system with RL load connected in parallel at PCC (Point of Common Coupling). It is found that THD slightly decreases if the increment is being done in the power factor of the load. These distortions have been then reduced below 5% by connecting passive filters at PCC. Simulation results of THD, power output, and efficiency have been tabulated with variation in the operating power factor of the load. Further, power transfer to the utility grid from the PV inverter is examined along with THD and circuit efficiency. Finally, the simulated results have been plotted and compared with analytical results for validation of the proposed scheme.