A time-domain approach to transmission network equivalents via Prony analysis for electromagnetic transient analysis

This paper presents a method of obtaining transmission network equivalents from the network's response to a pulse excitation signal. Proposed method is based on modal decomposition representation for the large-scale interconnected system. In this framework we use Prony analysis to identify the network function of the system and to decompose the large system into a parallel combination of simple first-order systems. As a result network function of the transmission network can be identified easily, and Thevenin-type of discrete-time filter model can be generated. It can reproduce the driving-point impedance characteristic of the network. Furthermore proposed model can be implemented into the EMTP in a direct manner. The simulation results with the full system representation and the developed equivalent system showed a good agreement. Keywords: Network Function, Modal Decomposition, Prony Analysis, Electromagnetic Transients.