  A Pulse-Compression Probing (PCP) method is applied in time-domain to
identify an equivalent circuit model of a distribution network as seen from the
transmission grid. A Pseudo-Random Binary Pulse Train (PRBPT) is injected as a
voltage signal at the input of the feeder and processed to recover the impulse
response. A transfer function and circuit model is fitted to the response,
allowing the feeder to be modeled as a quasi-steady-state sinusoidal (QSSS)
source behind a network. The method is verified on the IEEE 13-Node
Distribution Test System, identifying a second order circuit model with less
than seven cycles latency and a signal to noise ratio of 15.07 dB in the input
feeder current.
