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This paper proposes a new integrated model for solving the distribution system planning (DSP) problem by implementing distributed generation (DG) as an attractive option in distribution utilities territories. The proposed model integrates a comprehensive optimization model and planner's experience to achieve optimal sizing and siting of distributed generation. This model aims to minimize DG's investment and operating costs, total payments toward compensating for system losses along the planning period, as well as different costs according to the available alternative scenarios. These scenarios vary from expanding of an existing substation and adding new feeders to purchasing power from an existing intertie to meet the load demand growth. Binary decision variables are employed in the proposed optimization model to provide accurate planning decisions. The present worth analysis of different scenarios is carried out to estimate the feasibility of introducing DG as a key element in solving the DSP problem.

In this paper, a novel approach is presented to study the impact of distributed-generation penetration on recloser-fuse coordination. The main core of this approach is based on an assessment process using a classification technique to classify the recloser-fuse coordination status at fault conditions to either coordination holds or coordination lost. Accordingly, the distribution system operator can take the proper decision. Then, two complementary actions are recommended in the proposed approach as a solution to decrease the number of cases where coordination is lost. The first one is to search for the best DG locations, where such locations are characterized by the minimum number of cases classified as coordination lost. The second one is based on changing the recloser setting in such a way to minimize the cases where coordination is lost. This new approach has been implemented on the IEEE 37-node test feeder using MATLAB-based developed software and the obtained results are presented and discussed.

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