Unbalance power flow calculation for a radial distribution system using forward-backward propagation algorithm

Abstract

Abstract-Three-phase power flow for unbalance distribution system is carried out using Forward-Backward Propagation Technique. The equivalent injection current method is employed to represent the loads and shunt admittances. The algorithm starts with mapping the distribution network to determine the forward and backward propagation paths. The backward propagation is used to calculate branch currents using the bus injection currents. The forward propagation is employed to calculate bus voltages using the obtained branch currents and line impedances. The algorithm offers robust and good convergence characteristics for radial distribution system. The algorithm is presented for the IEEE 34-bus system.

Reactive Power/Voltage control for unbalanced distribution system using genetic algorithms

“…These characteristics are the well-known obstacles that may cause the sophisticated power flow algorithms fail to converge. When R/X ratio increases, power flow iteration becomes unstable and may even diverge [6]. This makes the analysis of unbalanced distribution systems complicated requiring a robust power flow algorithm.…”

“…Distribution line charging is usually too small to be included [7]. The algorithm offers robust and fine convergence characteristics for unbalanced radial distribution systems [6].…”

“…The optimizations are carried out for the IEEE 34-bus unbalanced distribution system [6]. Some modifications are made to demonstrate the effectiveness of the optimal dispatch scheduling.…”

“…The system is shown in Fig. 4 and the data is available in [6]. The shunt capacitor and load data are given in Table 1 and the Appendix (Tables A1 and A2), respectively.…”

“…In this paper, an unbalanced power flow algorithm is developed based on the forward-backward propagation approach and the current injection calculation [6]. The algorithm operates directly on the three-phase system without modification.…”