Energy characteristics of a fixed-speed flywheel energy storage system with direct grid-connection

Junji Kondoh, Takuji Funamoto, Taisuke Nakanishi and Ryohei Arai

Energy, 2018, vol. 165, issue PB, 701-708

Abstract: Flywheel energy storage systems (FESSs) store kinetic energy in the form of Jω2⁄2, where J is the moment of inertia and ω is the angular frequency. Although conventional FESSs vary ω to charge and discharge the stored energy, in this study a fixed-speed FESS, in which J is changed actively while maintaining ω, was demonstrated. A fixed-speed FESS has the advantage of being capable of direct grid-connection without requiring a power electronic interface. A prototype with an output power of several hundred watts and a charge/discharge period of several seconds has been developed and discharge/charge operations have been conducted while mechanically measuring the output energy Em from the flywheel and mechanical work Ec, to vary J. Theoretical analysis suggests a ratio of 2.2 for Em/Ec, and experimental values of Em/Ec show high reproducibility, approximately 1.8 and 2.7 in discharge and charge operations, respectively. The reason for the errors can be explained by the loss incurred in varying J.

Keywords: Flywheel energy-storage system; Variable inertia; Fixed speed; Induction machine; Efficiency (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:165:y:2018:i:pb:p:701-708

DOI: 10.1016/j.energy.2018.09.197

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