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Power output fluctuation of photovoltaic power generation systems (PVSs) may cause negative impact on the load frequency control of existing electric power system when the penetration of PVSs is quite large. For the cost-effective mitigation, the proper evaluation of apparent electricity load fluctuation property is very important, taking PVSs power output into account as negative load. Considering the independency of fluctuation patterns of insolation among various locations, this study evaluates the standard deviation of total power output fluctuation of PVSs by using the multi-point observation data of insolation. The diversity of PVSs penetration in the wide area is taken into account based on the statistical data of distribution of residences. Then, by taking the standard deviation of electricity load into account, this study discusses the impact of large-scale penetration of PVSs on the load frequency control.