Large scale introduction of renewable energy is required to realize a decarbonizing society. In order to introduce renewable energy on a large scale in a remote island electric power system that is not interconnected, it is necessary to introduce excessive thermal power generation facilities, renewable energy generation facilities, and storage batteries. Also, since renewable energy depends on wind energy and insolation of sunlight, the generated power greatly varies depending on the weather conditions of the day.

In view of the characteristics of renewable energy as described above, in order to utilize and utilize renewable energy in isolated power systems (see Fig. 1). There are various issues to increase the penetration ratio of renewable energy. Furthermore, there is also an issues of how to supply power energy with the lowest possible electric power price and/or with high reliability by coordinating the conventional thermal power generators and renewable energy power facilities.

In this research, in order to cope with the uncertainty of renewable energy, we will examine high accuracy prediction method of wind and solar energy. In addition, when the weather conditions change in short time, we are studying a method to cope with the operation of each power generation facility and power storage facility with re-prediction of wind speed and solar radiation amount. In the operation of each facilities, we introduced an optimal operation method that enables the operation of the electric power system at the lowest cost. Regarding the uncertainty of the generated power of renewable energy, by introducing a robust optimization method, it is possible to minimize the operating cost of the power system, taking into consideration various constraints and uncertainties is there.

In order to construct a decarbonized society by introducing high-penetrated renewable energy, it is necessary to devise measures to operate the electric power system different from the conventional one. It is impossible to operate efficient power system only by unilateral power generation so far, for example, it is necessary to operate the power system by cooperation with electric vehicles (see FIG. 2). In order to expand the amount of renewable energy to be introduced, a various system operation ideas are required.