Automatic interconnecting system for photovoltaics and utility line

This paper describes a new interconnecting system for numerous photovoltaics and utility line. In this system, each of the DC-DC converters derives the maximum power from each of photovoltaics for any daylight strength. Outputs of converters are connected to a DC bus line. The inverter sends power from the DC bus line to the utility line. The inverter is automatically synchronized to the utility line by means of a phase locked loop which includes the inner resistance of the DC bus line. A power factor controller combined with the phase locked loop makes power factor unity by changing the output voltage of the inverter corresponding to total output power of the photovoltaics