study on the application of photovoltaic power system in the local area

摘要

In this paper, the grid - connected method in the local area to connect the local area system with a number of PV units to commercial power system at one point is proposed. The local area system composed of hundreds of residential PV power system with different electrical load patterns and office PV power system by area distribution line is described. The characteristics of the grid connected method and the grid - connected method in the local area were studied and simulated by computer. The input data used in this simulation are the global irradiance on inclined plane and the ambient temperature of HASP data of Tokyo, the residential load data which have four kinds of electrical load patterns, the office load data with one kind of electrical load pattern and the rate of electrical energy cost and so on. As the results of simulation it is possible that the surplus power in the PV units is supplied to the other loads by area distribution line in the grid - connected method in the local area. And then, it is found that the electrical power generated by residential PV power system can be used effectively by area distribution line in the grid - connected method in the local area. The electrical energy cost is lower in the grid - connected method in the local area compared with the grid - connected system when selling price of surplus power is lower than purchased price of shortage power.