A technical topic

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This letter proposes a very efficient formulation of the security-constrained generation capacity expansion planning problem using the power transmission distribution factors and line outage distribution factors. The classical formulation has been reformulated so that both pre- and post-contingency problems have been included simultaneously. Therefore, the inclusion of the security criteria in the optimization problem strengthens the generation investment planning.
Finally, two contributions have been proposed to the state-of-the-art: 1) the inclusion of the N-2 analysis to achieve a minimum cost generation plan where the system is kept in a normal state after a major disturbance; and 2) a lower complexity in the optimization problem, where the pre- and post-contingency transmission constraints are modelled simultaneously using linears factors. In addition, there is only the active power generation of each unit as decision variables in the security-constrained transmission modelling. Results show that the inclusion of including the security criteria in the optimization problem strengthens the investment planning. Finally, the designed framework could model a contingency list of credible contingencies to obtain a strong optimal plan.