  For electromagnetic transient (EMT) simulation of a power system, a
state-space-based approach needs to solve state-space EMT equations by using
numerical integration methods, e.g., the Euler method, Runge-Kutta methods, and
trapezoidal-rule method, at small time steps. The simulation can be slow on a
power system having multiple generators. To speed up state-space-based EMT
simulations, this paper proposes a Differential Transformation based
semi-analytical method that repeatedly utilizes a high-order semi-analytical
solution of the EMT equations at longer time steps. The proposed
semi-analytical method is tested on the detailed EMT model of a four-generator
two-area system. Simulation results show the significant potential of the
proposed method to accelerate EMT simulations of power systems compared with
traditional numerical methods.
