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Generator rotor angles and speeds are critical variables for representing dynamic characteristics of a power system following a disturbance.Multiple areas prevent availability of dynamic equations with regard to dynamic variables of generators and observation equations.This makes dynamic state estimation of generators more difficult.This paper proposes a three-step PMU-based multi-area dynamic state estimation following a disturbance.In the first step,each area performs its own state estimation without considering dynamic models of generators.The steady-state model of each generator is involved in this step.In the second step,the control center coordinates each area to ensure optimal estimated state for the whole grid.In the third step,revised internal voltages and rotor angles are employed to update other variables of generators.Linearization of a circuit is used to obtain observation equations for dynamic state estimation.The performance of multi-area dynamic state estimation is illustrated in the IEEE 30-bus system.