
Flywheel energy storage (FES) works by accelerating a rotor () to a very high speed and maintaining the energy in the system as . When energy is extracted from the system, the flywheel's rotational speed is reduced as a consequence of the principle of ; adding energy to the system correspondingly results in an increase in the speed of th. Some FACTS devices bear a DC link in their system, combined with ESSs constructed with battery, supercapacitor, or flywheel. There are two major types of FACTS devices named dynamic voltage restorer (DVR), 87 and static synchronous compensator (STATCOM). 88, 89 Numerous authors have investigated the work of connecting FESS with the DC link of . [pdf]

The first were installed in 2009, and are not associated with storage. The installed capacity is 13 MW, in particular via the Longoni power plant, inaugurated in 2010. Solar energy is the only renewable energy with significant development potential on the island; the wind potential (22 MW according to a study) would not lead to a significant production because the wind blows only 6 months per year. [pdf]
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