Power Flow Solution in Asymmetrical Multiconductor Systems

摘要

The power flow solution of a three-phase networkcan be more easily computed if the power system is assumed ashaving a symmetrical structure with balanced loads. In this way,only the single-phase positive sequence circuit can be consideredsince it is wholly representative of the balanced operation of theelectrical system. However, technical literature has investigatedgeneral methods to compute power flow solution inasymmetrical/unbalanced situations, since these situations mayoccur in real networks, especially in the distribution ones. Thus,in this paper the authors provide an iterative algorithm (easilyimplementable into common PCs) for the study ofasymmetrical-structure networks and with unbalanced loadscenarios. This calculation approach is different from theclassical numerical ones (e.g. Newton-Raphson and derived) andit is characterized by a high solution accuracy and low CPUtime, even in ill-conditioned cases. Eventually, real case studiesshowing the existence of negative, zero sequence currents, andvoltages in balanced-load and asymmetrical networks arepresented.