The development of the flywheel energy storage system applying the high temperature superconducting magnetic bearing - The examination of a demonstration machine by having it charged/discharged with solar photovoltaic power

The flywheel energy storage systems (FESS) that can stabilize the fluctuation of the output of the solar photovoltaic power generation system have been developed as a joint project of five enterprises. In this project, a FESS demonstration machine was developed and the examination of the machine was conducted in such a way as to alternate charge and discharge with solar photovoltaic power using this machine. This project was implemented for 4 years. The main devices were assembled so as to be completed as the FESS demonstration machine in an assembly plant. After the completion of the FESS demonstration machine, the machine was reinstalled in the examination plant that is located in Kofu City, Yamanashi Prefecture. The charging/discharging examination with solar photovoltaic power was conducted after the reinstallation. And it was confirmed that the FESS demonstration machine has the ability necessary for stabilizing the solar photovoltaic power generation.The occurrence of the blackout was assumed as the abnormality that would occur when the FESS demonstration machine is really operated, and the simulated blackout examination was conducted and it was confirmed that the FESS demonstration machine was able to stop safely even in cases where a blackout in operation occurred. With the completion of all the examinations in February 2016, the development project of the FESS demonstration machine was completed. The FESS demonstration machine can stabilize the photovoltaic power generation, and it can stop safely when a blackout in operation occurs. The above mentioned performances of the FESS demonstration machine were confirmed by the results of the performance evaluation examinations.