Decoupled Solution of Radial and Weakly Meshed Distribution Networks Through a Backward Method

A methodology for the analysis of radial or weakly meshed distribution systems supplying voltage dependent loads is developed. The solution process is iterative and, at each step, the loads are simulated by means of impedances. The network is divided into two sub-networks which must be solved separately and sequentially; in the first, named RP-net, only the lines resistances and the loads shunt equivalent resistances are considered; in the second, named XQ-net, only the lines reactances and the shunt equivalent reactances are taken into account. After a brief presentation of the b/f method, which is currently the most commonly used technique to solve distribution networks, the proposed methodology is detailed both for radial and for meshed systems. Finally, some results are presented in order to evaluate the performances of the methodology in terms of number of iterations and precision.