Transmission Expansion Planning Considering Detailed Modeling of Expansion Costs

This paper presents an extended mixed integer linear programming (MILP) formulation of the transmission expansion problem considering a detailed modeling of expansion costs. In contrast to the widely used formulation, using cost-per-km coefficients multiplied with the circuit length, here costs are differentiated in costs for conductors, switching bays and poles. This allows a more accurate consideration of transmission corridors carrying multiple parallel circuits, since expansion costs contain both circuit- and corridor-specific costs. Exemplary results show a significant impact of the detailed consideration of expansion costs on the identified expansion measures proving the necessity of a more detailed consideration of expansion costs.