A Hybrid Microgrid System Including Renewable Power Generations and Energy Storages for Supplying both the DC and AC Loads

This paper presents an experimental study with a hybrid microgrid system, which is proposed and implemented in the Tagajo campus of Tohoku Gakuin University, Japan. The developed microgrid consists of renewable power generations of PV and wind power generator, two types of energy storage devices of secondary battery and EDLC (Electrical Double-layer Capacitor), together with programmable DC load and AC load models. The purpose of this experimental study is to verify whether this hybrid microgrid system can stably supply power to DC and AC loads simultaneously in case with considerable power fluctuation from renewable generations in its islanded operation. And the results obtained from this experimental study have illustrated that the microgrid and its control system can operate perfectly as being designed.