Optimal Conductor Size Selection in Distribution Systems Using the Harmony Search Algorithm with a Differential Operator

In this article, a new approach is proposed to optimize conductor size selection in radial distribution network planning for the purpose of minimization of real power loss and enhancement of voltage profile. The objective function is modeled as a problem that minimizes the sum of capital investment and capitalized energy loss cost. Voltage constraints and the maximum current carrying capacity of the conductors are also considered in the evaluation of the objective function. The harmony search algorithm with a differential operator is used to solve the optimal conductor size selection problem and to determine the size and type of the conductors. The effectiveness of the proposed method is demonstrated through simulations on 16- and 85-bus systems, and the results obtained are encouraging.