A grid-connected PV-ECS system with load leveling function taking into account solar energy estimation

In this work, a small grid-connected distributed generation system with load leveling function has been developed using PV panel and ECS. The system can produce power by PV panel, store energy from grid line and PV panel when the load demand is low, and finally supply the stored energy to load during the peak demand. To level the daily load properly, it is necessary to know how much power the PV panel will generate tomorrow. Hence a procedure has also been devised to estimate the output power of PV panel by calculating solar radiation. The accuracy of the calculated soar radiation and PV output power has been verified by practically measured data. Everyday we have to declare, how much power will be taken from the grid line tomorrow, for proper functioning of the system. With an aim to set the optimum value of grid power, to level the load properly and to use 100% output power of PV panel, a simulation program has also been developed. Finally the performance of our system has been studied for several days in different weather conditions, using the estimated output of the PV panel and the simulation program.