Optimal Infrastructure Planning of Active Distribution Networks Complying With Service Restoration Requirements

For a fault occurring in a feeder of an active distribution system, the targeted restoration strategy consists of activating, in a first stage, clusters of nodes supplied each by a unique resource. This resource could be a DG or a tie-switch (tie-line) that provides power from a neighboring feeder. To reinforce the security of supply, in a second stage, each DG cluster is connected to a tie-switch cluster to form a so-called large cluster. Therefore, the problem presented in this paper aims at determining the optimal numbering, sizing, and location of potential distributed energy resources as well as the optimal border of the associated clusters. It is formulated in term of a convex second-order cone optimization problem where the objective is to find the best trade-off between picking up as many loads as possible whatever the fault location and the investment plus the maintenance costs. This problem has been solved in the case of a modified IEEE 34-bus system considering different potential infrastructure scenarios.