Distribution networks are evolving to become more responsive with increasing integration of distributed energy resources
(DERs) and digital transformation at the grid edges. This evolution imposes many challenges to the operation of the network,
which then calls for new control and operation paradigms. Among others, a so-called grid-edge control is emerging to
harmonise the coexistence of the grid control system and DER’s autonomous control. This paper provides a comprehensive
overview of the grid-edge control with various control architectures, layers, and strategies. The challenges and opportunities
for such an approach at the grid edge with the integration of DERs and digital transformation are summarised. The potential
solutions to support the network operation by using the inherent controllability of DER and the availability of the digital
transformation at the grid edges are discussed.