Enlargement of stable region in a power system with wind energy power plant

This paper presents a method to enlarge the stable region of a power system with a wind energy power plant, by using energy capacitor system and adequate control systems. A four-machine d-q axis digital model was used. An aggregated model of wind power generators was considered as one of the units. In order to enlarge the stable region of the system, the adequate location of the ECS was first decided based on the total speed deviation index of the units. Two kinds of controllers, proportional and fuzzy logic were used. Their parameters were tuned to get the least total speed deviation index in order to obtain the highest electrical power output at each machine. Simulations result indicates that the stable operation region was considerably enlarged, especially in the case of fuzzy logic control.