A system approach to accurate switching transient calculations based on state variable component modelling

Power systems are built up from components of widely different nature: lumped parameter elements, linear or nonlinear, transmission lines with ground return, and complex components, such as generators or transformers. Their common feature is the appropriateness of a nodal terminal description. The paper shows that a component of any type can be adequately modelled, for a numerical algorithm, by a Norton-type multiport nodal equivalent, with time-varying current sources at the terminals. As a result, a general algorithm is obtained for the calculation of electric transients in complex systems.