The transient simulation of a power network with invariant admittance matrix

A switch model previously proposed in references Huang-Jinwn, et al. (1999), S.R. Hui, et al. (1994) and P. Pejevic, et al. (1999) for power electronics applications is adopted here to simulate electromagnetic transients in power systems. The switch model is in the generic form for EMTP analysis, consisting of a constant conductance element and a current source in parallel. Switch operations are simulated by means of the current source only; therefore, at these operations, the conductance matrix representing the power system under study is maintained constant throughout an entire simulation. It is shown here that the switch model is very general, it is efficient and numerically very stable.