Automatic Interconnecting System for Photovoltaics and Utiliy Line

This paper will describe a new interconnecting system for numerous photovoltaics and utility line. In this system, each of dc-dc converters derives the maximun power from each of photovoltaics for any daylight strength. Outputs of converters are connected to dc bus line. The inverter sends power from dc bus line to the utility line. The inverter are automatically synchronized to the utility line by means of phase locked loop. 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 photovoltaics.