Electromechanical disturbance propagation and oscillation in power systems

Electromechanical dynamics in a chain power system with multi-segment uniform are studied in this paper. Utilizing the Laplace transformations, the machine rotor´s angle increments and power increments at all buses are derived under a unit-step function disturbance. The analytical expression of Bessel functions reveals that the electromechanical disturbance propagates along the chain power system. The reflection and transmission formulae of electromechanical disturbance propagation are presented, which is the same as that of electromechanical wave propagation in a continuum model. Furthermore, power oscillation frequency is derived from the viewpoint of electromechanical disturbance propagation. Simulation results prove the correctness of the proposed theory.