Three-Phase Line Modeling for Unbalance Distribution Power Flow Using Forward-Backward Propagation Algorithm

A direct modeling for three-phase distribution line is employed for unbalance power flow calculation. The effectiveness of the model is demonstrated by the needless of decoupling the system into symmetrical components or individual phases. A suitable method for unbalance power flow analysis may then be used. This paper proposes Forward-Backward Propagation for the power flow. The equivalent injection current method is employed to represent the loads and shunt admittances. The algorithm offers robust and good convergence characteristics for radial distribution system. The algorithm is presented for the IEEE 34-bus system. The unbalance level of the system is also analysed. Keywords-direct modeling; unbalance power flow analysis, forward-backward propagation, equivalent injection curren