A Synchronous Machine Model for Unbalanced Analyses.

Abstract

This paper presents a new unsymmetrical model of synchronous generators for power system transient stability simulations. The symmetrical component method has been used traditionally in the analysis of unbalanced faults in power system. This is mainly because the synchronous generators, which play an important role in the power system, can be easily treated by the method. However, when analyzing a system that has elements with unsymmetrical impedance, it may not be easy to use symmetrical component method. In such cases, the simulations can be easily executed by using the phase coordinate method. However, there are few papers that derive a phase coordinate model of synchronous machines. This paper analyzes synchronous generators under unsymmetrical condition in detail by using the symmetrical component method, and then it derives a model of synchronous generators for the phase coordinate method. 952T.IEE Japan, Vol. 116-D, No. 9,'96

Unbalanced steady‐state model of synchronous machine for EMT initialisation

“…In [10], phase domain SM model is presented and solved via Newton–Raphson for unbalanced load flow analysis. Sequence component model of SM is studied in [11], while both [10, 11] use sequence component parameters for SM and is not suitable for EMT software, such as MATLAB/SimPowerSystems, PSCAD/EMTP etc. in which d – q ‐axis‐based SM parameters are used.…”

“…in which d – q ‐axis‐based SM parameters are used. Meanwhile, the damping windings in d‐ and q ‐axis are not fully considered in [10, 11], which has an impact on the accuracy of unbalanced load flow.Lipo proposed an unbalanced harmonic analysis model of synchronous machine with the extension of the d – q theory [12], while it is a linear harmonic model and cannot account for unbalanced load flow. Meanwhile, saturation phenomenon has a great impact on the modelling of SM which is not considered in [12].…”