This chapter has proposed a new method of network frequency regulation by using Flywheel Energy Storage System (FESS) for an isolated power system including a wind farm, and the validity of the proposed method has been evaluated by computer simulations. From the comparative study between the proposed method and the conventional output smoothing control of wind farm, it has been shown that the proposed method is very effective on the stabilization of network frequency in an isolated small power system. The proposed method can be applied basically not only to a FESS system but also other types of energy storage system. Therefore the proposed method can contribute to expand wind energy utilization into isolated power systems like a small island.
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