抄録
Future massive introduction of renewable power generation can cause a large amount of surplus power. The surplus power will be utilized effectively for charging Electric Vehicles (EVs) if the charging demand is shifted to the time when the surplus power is enough while without compromising the convenience of EVs utilization as vehicles. This study proposes a Charging Promotion Time Zone (CPTZ) to which the charging demand is shifted depending on EV owners’ decision for charging in consideration of change in charging cost affected by electricity supply and demand balance. As a result, daily cumulative irradiance works as a measure to determine the length of CPTZ in a day and to promote the charging decision by EV users during CPTZ. The annual EV charging demand met by renewable power supply is increased to about 50% from 40% in the case without the CPTZ. The sensitivity analysis on the kW capacity of charger for EVs for commuting purpose shows that the ratio of charging demand met by renewable power supply and the annual peak of overall charging demand is the same regardless of charger kW capacity because the charging demand is effectively dispersed within CPTZ.
