A Novel Framework for Loss Reduction of Distribution Networks Based on Optimal Phase Swapping Algorithm

Power loss reduction is one of the major important issues in power system studies. There are several methods, e.g., phase swapping in laterals and nodes, which both of them need asymmetrical power flow due to the nature of the distribution networks. However, existing methods need power flow calculation, taking noticeable time, especially in large networks. Latter problem makes the optimization algorithms more time-consuming in order to find the best solution between many candidates. This paper introduces a novel framework for the optimal phase swapping with the goal of loss minimization. Since this action is performed from the low voltage (LV) nodes, a 4-wire asymmetric power flow algorithm is needed, which is developed in this paper. The proposed framework includes two steps: a) 4-wire linear current injection method based on the superposition theorem (referred as SP-4LCIM), and b) the algorithm for the optimal phase swapping of LV loads. Accuracy of the proposed framework is evaluated for different standard test networks and also an actual network. In addition, accuracy and computational burden of the SP-4LCIM are compared with other conventional power flow methods. The obtained results verify accuracy and superior performance of the developed framework