A method for planning of transmission networks

In this paper, a new solution concept for planning of transmission networks using mixed integer non-linear optimization technique is presented. The method starts by considering a suboptimal solution get by any other method (heuristic techniques, meta-heuristic techniques or even by planner experience) and through applying a high accurate mathematical planning mixed integer non-linear model based on full AC load flow, the suboptimal solution is modified to get less cost planning networks. The modification is made simply through addition of new lines from the set of unselected lines and deleting some lines, if any, from the set of selected line. The lines added is made sequentially where one line is firstly tried, then two lines, then three lines and so on to get the optimal solution while line deletion is made free. The solution method presented is verified through its application to a 19-bus system.