Frequency control on an island power system with increasing proportions of combined cycle gas turbines

As combined cycle gas turbines (CCGT) comprise an ever-increasing proportion of generating capacity on an island electricity system, the importance of understanding the effects of their characteristic behaviour on the system, particularly on frequency control, becomes crucial. A suitable mathematical model of a CCGT is developed to study its response following a frequency disturbance. This model is then integrated into a larger model, representative of the Irish electricity system, and the effects of increasing proportions of CCGT generation are examined. The results of this study are then considered in conjunction with the impact of increased amounts of wind power and of interconnection via HVDC to a larger system.