“…To overcome this problem, energy storage devices such as batteries, superconducting magnetic energy storage (SMES) systems, etc., which are able to supply and absorb active power rapidly [9,10], have been explored as one of the most effective control mechanisms of the system frequency. The SMES has been successfully applied to solve many problems in power systems, such as improvement of power system dynamics [11,12], frequency control in interconnected power systems [13,14], improvement of power quality [15], stabilization of subsynchronous oscillation in the turbine generator [16], load leveling,[17], etc. Especially, an application of SMES to control the frequency in a hybrid wind–diesel power system due to load changes has been presented in [18,19].…”