APPLICATION OF LONG-TERM SIMULATION PROGRAMS FOR ANALYSIS OF SYSTEM ISLANDING

This paper describes the main results and conclusions from the applica tion of two different long-term stability programs to the analysis of a system islanding scenario for a study case developed by Red Electric a de Espana (REE), based on the Spanish system. Two main goals were to evaluate the performance of both simulation programs in the long-term stability area, and to analyze the influence of some important contro l and protection elements (tie-line loss-of-synchronism relays, underf requency load-shedding, load-frequency control, and power plant dynami cs). Conclusions about modeling and computational requirements for sys tem islanding (frequency) scenarios and use of long-term stability pro grams are presented.