Abstract: This paper establishes the design approach of flywheel energy storage system (FESS) in a uninterruptible power supply. The Flywheel Energy Storage (FES) system has emerged as one of the best options. After brief introduction to the FES system and its theory of operation, the paper focuses on the important role of the FES system in enhancing the operation of the distribution network. Supported by illustrated circuits, the FES system in the improvement of the power quality of the network. A flywheel energy storage technology was ended, with a special focus on the progress in automotive applications. In order to improve the efficiency and lifetime, then it discusses a newly proposed design of the FES system that emerged recently, which includes the use of Superconducting Magnetic Bearings (SMB) and Permanent Magnetic Bearings (PMB). In conclusion, the paper analyses the FES systems great potentials that could be exploited in improving the reliability of the electrical system.

| DOI: 10.17148/IJIREEICE.2021.9726