Frequency domain transient analysis of transmission networks including nonlinear conditions

This work describes a method for the analysis of electromagnetic transients in multiphase transmission networks using the numerical Laplace transform. The proposed procedure is based on the superposition principle and is applied to switching and nonlinear elements modeling. Switching operations are modeled as initial condition problems by means of injected current sources. In the case of nonlinear elements, a piece-wise linear approximation is made, which reduces the problem to a sequence of switching operations. Several applications and comparisons with results obtained with the EMTDC and ATP programs are presented.