Design and analysis of a simpler DC to AC power transfer circuit for residential size photovoltaic panels

The evolution of photovoltaic (PV) based power generation systems for residential applications has been hindered by the high cost required to operate in a nonisolated mode with respect to the electric power grid. The inverter-type circuits used by some utilities to interface PV energy with the AC power grid are prohibitively expensive for residential use. Thus, in residential applications, the energy conversion potential and cost savings potential of the PV system are never fully realized. The storage of PV energy in batteries is a step toward enhanced utilization of PV energy but is still an isolated mode operation. The basic power transfer circuit described in this paper provides a simple, cost-effective means of interfacing PV panels with the electric utility in relatively low power residential applications. The residential PV panel will therefore operate in a nonisolated mode and function as a generator on the electric grid which will result in a decrease in net power consumption and a corresponding reduction in electric utility costs. Nonisolated operation of residential PV energy conversion systems through the use of a power transfer circuit will result in a reduction in system payback time as well as decreased use of finite supply fossil fuels and the harmful emissions resulting from their combustion