Optimum Design of a Grid-Connected Photovoltaic Power System

Abstract

As a part of various electric power sources, the photovoltaic power system are expected to be one of the important power systems in a near future. The authors have developed the computer program of optimizing grid-connected photovoltaic power system from points of view of daily electric load and electrical energy cost. In a grid-connected photovoltaic power system (PV system), electric power generated is supplied to distribution line and load.
In this paper, the optimum design of typical private residence with PV system in Tokyo is calculated by using the various system performance models, the cost models, the daily electric load pattern, environmental data and so on.
It was found that the capacity of PV system is 2.6kW when the selling price of surplus power and buying price of shortage one are equivalent. And then, the electrical energy cost of the optimum PV system at 2, 000 A. D. is estimated to be about 35yen/kWh.