Short-run fluctuation of residual load by high penetration photovoltaic power generation system

By using the data of electricity demand and multipoints irradiance simultaneously observed in the Chubu region in Japan, this study statistically evaluates the short-run fluctuation of residual electricity load including the aggregated PVS power output as a negative electricity demand. The hourly maximum fluctuation width (MFW) calculated using 20 min window is evaluated as a measure of short-run fluctuation. As a result, if the longer cycles than a few ten minutes of the aggregated PVS power output are excluded, the MFW of residual electricity load is increased by only 25% on average compared with the MFW of original electricity demand. However, because of the low predictability of the ramp-up/down of aggregated PVS power output, if longer cycles than a few ten minutes are taken into account, the capacity for the load-frequency control (LFC) would be increased so much. The results suggest that further study regarding the integrated simulation of economic load dispatching control (EDC) and LFC is needed for evaluating the required flexibility of electric power system with high penetration PVS.