Abstract
An analytical formulation for power system electromagnetic transient analysis has been developed recently in which successive transformations are made between the frequency domain, the z plane, and the time domain. In this sequence, transmission line forward impulse responses and surge impedence functions formed in the z plane are similar to response functions typical of digital filters. From this starting point, the equations of a multiconductor power transmission line are given in scattering form. It is then shown how these lead to a digital filter model, which draws on the now standard canonical realizations of digital filter design. Procedures are given by which the z-plane functions of this filter representation are related to power transmission line parameter sets over the range of frequencies relevant to power system electromagnetic transients. The paper then considers two application areas of the filter models derived.
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