Description: Microgrids are eco-friendly power systems because they use renewable sources
such as solar and wind power as the main power source. However, the stochastic nature of
wind and solar power is a considerable challenge for the efficient operation of microgrids.
Microgrid operations have to satisfy quality requirements in terms of the frequency and
voltage. To overcome these problems, energy storage systems for short- and long-term
storage are used with microgrids. Recently, the use of short-term energy storage systems
such as flywheels has attracted significant interest as a potential solution to this problem.
Conventional flywheel energy storage systems exhibit only one control mode during operation:
either smoothing wind power control or frequency control. In this paper, we propose a new
flywheel energy storage system based on a doubly fed induction machine and a battery for
use with microgrids.
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