A modified forward backward sweep load flow algorithm for unbalanced radial distribution systems

A modified forward backward sweep load flow algorithm for unbalanced radial distribution systems is proposed in this paper. The proposed algorithm modifies branch current calculation approach in backward sweep by using three matrices. They are matrices A, B and C. These matrices are used in identifying downstream buses and also in calculating branch current or power flow in an easy manner. For accurate analysis, the mutual coupling between the phases has been considered in the mathematical model. The performance of the proposed method is validated on a 25-bus unbalanced radial distribution networks and the results show that it takes less iterations to converge as compared to a conventional forward-backward sweep load flow algorithm.