AN ANALYSIS OF TIME-DEPENDENT SPATIAL-DISTRIBUTION OF OUTPUT POWER FROM VERY MANY PV POWER-SYSTEMS INSTALLED ON A NATIONWIDE SCALE IN JAPAN

The time-dependent geographical diversity of electric power output is essential to provide more rational basis for the promotion of photovol taic (PV) power generation systems diffusion on a large scale. A set o f regression formulae was developed to evaluate hourly global irradian ce at about eight hundred sites throughout Japan. And regional distrib ution of hourly AC electricity output from very many PV stations were estimated, assuming that grid-connected 3 kW PV power generation syste ms are installed on all the roofs of detached houses in principal town s. The smoothing effect of PV output power fluctuation was examined in conjunction with interconnection capacity between power grids.