Microgrid in Mori-machi, Hokkaido, interconnecting large-scale photovoltaics and EV batteries

Research on the stable operation of regional microgrids in order to expand the spread of renewable energy toward carbon neutrality in 2050 and to provide a stable supply of electricity in the event of a disaster. In this research, the main power source will be photovoltaic power generation that can be used anywhere, and we will consider equalizing the amount of power generation by distribute power to demand area. In addition, by using the EV battery as a storage battery, it is possible to reduce the cost associated with installing the storage battery. This study assumes Mori-machi, Hokkaido, Japan. Mori-machi, Hokkaido has a large undeveloped area and can be installed in a large number of solar power generation, so it can be applied to countries with abundant solar resources. Calculate the error in the amount of solar radiation in Mori-machi and the surrounding area, based on that, the capacity of the power plant will be distributed. Calculate the power plant capacity and the number of solar module by calculating so that the power demand in the assumed area matches the annual expected power generation amount. After that, the surplus power generation amount for one hour is calculated using 22 May, Annual average, which is the maximum amount of solar radiation, and the storage battery capacity per vehicle is determined. Finally, the number of years of profit recovery compared to the purchase of electricity is 10.639 years. When the recovery period is calculated with the power demand as a variable, it is possible to realize up to about 300 GWh when the investment standard is 20 years. If the discount rate is 3% and the EV subsidy is 50%, the collection period will be 21 years if the DCF method is used, which is fully feasible.