An MILP model for reliability-based placement of recloser, sectionalizer, and disconnect switch considering device relocation

By optimal placement of protection and switching devices in distribution networks, maximum improvement in system reliability can be achieved with minimum equipment cost. This study presents a mathematical model for simultaneous placement of recloser, sectionalizer and disconnect switch (including remote-controlled and manual switches). A mathematical model for sectionalizer's automatic operation in coordination with the upstream recloser is proposed in this paper. In addition, a new model is introduced for relocation of the existing equipment, and the effect of tie switch is also addressed. The model is formulated in the form of a mixed integer-linear programming (MILP) problem, whose global optimal solution is guaranteed. The objective of the presented model is to find the optimal device locations, in such a way that the equipment's investment, maintenance and relocation costs, as well as the customer interruption costs associated with permanent and temporary faults are minimized. To validate the developed model, it has been implemented on Bus 4 of Roy Billinton test system (RBTS), and it is solved using GAMS software and CPLEX solver. The obtained results from different scenarios and sensitivity analyses confirm the correct and justifiable performance of the model.& COPY; 2023 Elsevier Ltd. All rights reserved.