AC interconnection between longitudinal power systems - The Chilean case

This paper presents a comprehensive study about low frequency oscillations and transient stability when considering the interconnection of an extreme longitudinal power system with a second system through a tie line. The evolution of critical low frequency oscillation modes is investigated as the power transfer through the tie line increases. Time domain simulations are also conducted in order to verify some of the obtained results in the linear analysis. The simulations are based on detailed models of the two main power systems in Chile. The tie line model is based on technical data of the AC interconnection project which is under construction in Chile today.