Analysis of asymmetrical faults in power systems using dynamic phasors

Summary form only given, as follows. This paper presents application of the dynamic phasor modeling technique to unbalanced polyphase power systems. The proposed technique is a polyphase generalization of the dynamic phasor approach, and it is applicable to nonlinear power system models. In a steady-state, the dynamic phasors reduce to standard phasors from AC circuit theory. The technique produces results that are very close to those obtained from time-domain simulations. Simulations in terms of dynamic phasors typically allow larger integration steps than the standard time-domain formulation. The authors present simulations of unbalanced faults involving a three-phase synchronous generator connected to an infinite bus through a transmission line, and demonstrate that models based on dynamic phasors provide very accurate descriptions of observed transients.