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AKE: Arbeitskreis Energie

AKE 12: Implications of Fluctuating Electricity Generation

AKE 12.2: Talk

Wednesday, March 18, 2015, 11:45–12:00, A 151

Transient stability of conventional power generating stations during times of high wind penetration — •Marios Zarifakis¹ and William T. Coffey² — ¹Electricity Supply Board, Generation, Asset Management, Dublin, Ireland — ²Department of Electronic and Electrical Engineering, Trinity College, Dublin, Ireland

The requirement to increase the level of energy produced from sustainable sources resulted in wind turbine generators and solar photo voltaic installations becoming major contributors into the energy pool. However, studies, recent measurements and experience in the island of Ireland show that the increase of these generation sources influences the ability of the frequency in the transmission and distribution system to remain stable after a transient disturbance. This weakening of the grid frequency strength is observed by an increase of the Rate of Change of Frequency (ROCOF). Furthermore, the frequency of the transmission system oscillates in a higher frequency range which triggers further oscillations in transmission connected synchronous generators. The development of an understanding of the behaviour of synchronous generators, connected to such a system with high wind penetration during transient disturbances, required a new modelling technique. A mechanical analogy and model was developed and verified using electromagnetic models in MATLAB and proven by comparing it with actual measurements on various generators. It highlights limitations to the operational range of synchronous generators and also limits to the amount of grid connected non synchronous generators used in wind turbine and solar PV installations.