The paper proposes an approach suitable for expansion planning of electrical
transmission, subtransmission and primary distribution networks.
The proposed approach is based on d.c. load flow and linear programming
techniques in order to handle the overall expansion planning problem as an
optimization problem. Linear programming solution gives the would-be‌selected line, that causes maximum reduction in the cost hnction.
Successively solving the modified model aRer adding the most effective line,
which having the largest overload to existing network, leads to the optimum
design of the electrical network at a time horizon.
Two case studies have been considered and the results are presented to
illustrake the potentials of the proposed approach.