Transient analysis of extended distribution networks

An analytical method is presented for the analysis of the transient behavior of extended distribution networks during short-circuits or start-up using interactive, graphical techniques. A fast algorithm is used which exploits the radical nature of the network to calculate the nodal voltages. Two models are available for the transient analysis of the induction motors, which can be used according to the degree of detail desired. Typical load types for each distribution substation are considered, and the parameters of the loads at each node are determined by the relevant composition of the aggregate nodal load. Disturbances provoked by any type of short circuit are considered, and the user can obtain the currents and voltages at any point of the radial network selected. The program is applied to the analysis of the transient behavior of a realistic distribution network during faults on the network. Comparison of the results with those obtained from the standard practice of considering the loads concentrated on the HV busbars of the HV/MV substations has shown differences of more than 150%