The Smart Grid＊, which was introduced in our CSR Report 2010, is an “intelligent power network” that controls the flow of power from both supply and demand sides. The grid is now drawing increasing attention in Japan, which has urgent need to make use of renewable energy. As a further step to put the research results on Smart Grid to practical use, we have developed “Micro Smart-Grid Demonstration System.” This very compact power grid connects control devices, such as photovoltaic power generator, small wind power generator, small power storage battery and power conditioner, via DC power cables of 1 km in total. The sources of energy are only the photovoltaic and wind power received in the Works. The data on the amounts of electric power generation, storage and consumption are monitored and controlled. The fluctuations are managed by the energy management system (EMS) with a storage battery so as to allow stable and efficient use of electricity.
This system also features a DC interconnection system called “DC Link.” With the EMS and DC Link, the system is expected to cut energy consumption by around 10% by reducing energy loss due to AC/DC conversion and transmission loss in cables. In its small size, this system contains our original control and telecommunications technologies as well as safety functions. Independent from any commercial power network, it can be a prototype for the stable use of renewable energy, and has received a great response since the announcement of the development. The power generated with the system is actually used for part of the lights and electric products in the Works and EV charging stations. We plan to collect and analyze various data including those on the impact of different weather conditions on the amount of power generation in order to demonstrate the effectiveness of the system over approximately one year.
＊ Smart Grid
A power transmission network that can optimize the ﬂow of power with a function to adjust the ﬂow of power automatically from both supply and demand sides through installation of measuring devices equipped with artiﬁcial intelligence or communication facilities.