A novel closed‐loop reconfiguration for radial distribution systems with dispersed generation

Abstract

Currently, Tai‐power Company is attempting to change its power distribution systems from radial distribution configurations to closed‐loop configurations in order to enhance the quality of the supply of electricity. Besides, the dispersed generation (DG) should be considered in making the reconfiguration suitable for present circumstances. To form a closed‐loop configuration, a new tie‐line is added in this paper to interconnect two different feeders of the original radial power distribution systems. The multi‐objective is, not only to reduce power transmission loss, but also reduce the cost representative of power distribution reconfiguration. Assuming that the cost representative is a linear function of the system's short‐circuit capacity, line current and bus voltage. The problem solution procedure in this paper is mainly divided into two steps. The first step is to form objective function by determining the weighting factor of each objective term based on the cost‐benefit analysis scheme. Then, the optimum solution is pursued for the objective function by means of refined genetic algorithm (RGA). An example is studied by using the proposed methodology. The results show that the cost‐benefit analysis scheme is verified capable of finding the weighting factors, that the RGA can render stable solutions and that the transmission loss reduction ratio is satisfactory.