Effect of voltage-stabilizing control with flywheel energy storage system on stable operation of induction machines in a small isolated power system

Introduction of wind power generation is promoted all over the world so as to utilize renewable energies. Among various types of wind power generation, two-speed switching type squirrel-cage induction generators are used in remote sites and island power systems due to its low cost and ease of maintenance. However, outputs of these generators tend to fluctuate and may deteriorate power quality. Especially, direct interconnection of the wind generator causes an instantaneous voltage sag in the power system. In addition, there are some large induction motor loads such as pumps in water desalination plants and motors in factories and these motors loads are also considered to be affected by the operation of the wind generators. In this study, effect of voltage-stabilizing control of a flywheel energy storage system on stable operation of these induction machines is investigated with developed induction machine models and island power system model.