State-Space Modeling of Transmission Line Dynamics Via Nonlinear Optimization

A frequency domain system identification program has been interfaced to the Electromagnetic Transients Program at BPA for constructing detailed dynamic models of transmission lines and cables. This paper develops the modeling strategies involved, and presents initial benchmark comparisons with field tests. These include a duplication of transposition-point reflections produced in a double-circuit line during energization of one circuit with the other grounded at the sending end.