Today in developing countries, Electrical distribution companies are facing ageing network, which represents significant value in terms of operating expenses (OPEX) and capital expenditures (CAPEX); that are respectively used to maintain and to replace ageing underground cable and to invest in RTUs which will highly serve the automation of the grid strategic substations. This work aims to develop a System dynamics based on integrated modelling to find the optimal balance between CAPEX and OPEX in order to reach a reliability that can meet the needs of interested parties. This optimum is determined following three main steps: first, the prioritization of underground cables to be replaced using a genetic algorithm and Weibull generalized process, second, the RTUs investment (location, number) using a multi-criteria optimization, and third, cost benefit analysis to determine options that provide the best solution by studying and modelling interdependency and dynamic behavior of the two preceding steps. The proposed approach is illustrated with simulated data of a reel distribution Feeder, and the results responds well to the needs and constraints of electrical distribution operator.
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