Frequency control of isolated power system with wind farm by using Flywheel Energy Storage System

Due to the recent expansion of renewable energy applications, wind energy conversion is receiving much interest all over the world. However, output fluctuations of wind generators cause network frequency variations in power systems. This can decrease the power quality and then cause a restriction of wind farm installation, especially in an isolated power system, for example, power system in a small island. Therefore the problem of output fluctuation needs to be solved for expanding further the wind energy conversion. This paper proposes an application of flywheel energy storage system (FESS) to an isolated power system with a wind farm for improving the network frequency quality. The validity of the proposed method is evaluated by computer simulation analyses using PSCAD/EMTDC.