Theoretical analysis of two-area interconnected system tie-line power oscillation

The tie-line power oscillation of two-area interconnected system after power impact is derived strictly. The dynamic equations before the disturbance and after the disturbance are constructed and the variation of the tie-line power is derived. Based on the theory of distribution of impact power in power systems, the tie-line power of two-area system after power impact is derived. The expressions of power oscillation and the peak power in the first swing are obtained. The numerical simulations and the generator tripping contingency analysis of North China-Central China interconnected system validate the result.