Abstract
Flywheel energy storage system (FESS) is an attractive technology owing to its main advantages of high energy density, long life cycle and cleanliness, and is suitable for a short-term power application. This paper presents the study results when applying FESS to accompany the battery energy storage system (BESS) for frequency regulation of islanded Amphoe Mueang Mae Hong Son microgrid, Thailand. The study is based on the real SCADA data of loads and generations in the area. The frequency fluctuations caused by the large PV power plant and the loads in the area are managed by three energy storage systems. Frequency deviation is divided into three frequency zones, i.e. the high, middle and low frequency ranges, which are handled by FESS, BESS, and hydro power plant, respectively. Selection guidelines of appropriate filters to decompose the frequency deviation signal is also investigated. The microgrid with FESS is simulated, and the results show that FESS of small capacity can help BESS suppress frequency fluctuation within allowable band, reduce battery sizing and cycling, and enhance the battery life as well.
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