Dynamic Equivalents of Active Distribution Networks: A short Review

The complexity of modern power systems, despite impressive progress in computational architectures, still necessitate
simplified representation of their parts for local dynamic studies. The high penetration of Distributed Generation (DG)
at the transmission and distribution network levels, the new load types and increased use of power electronics are
among key factors contributing to the systems’ complexity. Particularly, representation of active distribution networks
(ADN) in dynamic studies became an important research and practical implementation question. This report shortly
reviews previous and existing approaches for dynamic equivalencing of ADNs and offers some recommendations for
future research on this important issue.
The report is organized as follows. First, the problem of dynamic equivalencing is shortly presented together with
approaches to compute them. This is followed by a quick review of past notable works on this problem. Next, the
approaches for dynamic equivalencing of ADNs, proposed so far in literature (available to the author), are reviewed.
The reports ends with some recommendations for future research.