  Robust dynamic operating envelopes (RDOEs) solve the problem of secure
allocation of latent network capacity to flexible distributed energy resources
(DER) in unbalanced distribution networks. As the computational complexity of
RDOEs is much higher than that of dynamic operating envelopes (DOEs), which
disregard uncertainties in network parameters and DER capacity utilisation,
existing approaches to computing RDOEs have relied on linearised unbalanced
three-phase optimal power flow (UTOPF) models to numerate the network feasible
region approximately. The use of linearised models, however, risks producing
RDOEs that undermine network integrity due to inherent errors in the
approximation. This letter presents a practical sensitivity-filtering technique
to simplify RDOE numerical computation based on non-convex UTOPF formulations.
The accuracy and efficiency of the proposed approach are demonstrated on RDOE
allocation with various fairness metrics by testing on representative
Australian distribution networks.
